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webrtc / src / 4c9dbd508d37254975790ab40def1d2c024d8074 / . / media / engine / webrtc_video_engine.cc
blob: 69b71fff7ecf396e17e8517e2e67335419ee339e [file] [log] [blame]
/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "media/engine/webrtc_video_engine.h"
#include <stdio.h>
#include <algorithm>
#include <cstdint>
#include <initializer_list>
#include <optional>
#include <set>
#include <string>
#include <type_traits>
#include <utility>
#include "absl/algorithm/container.h"
#include "absl/container/inlined_vector.h"
#include "absl/functional/bind_front.h"
#include "absl/strings/match.h"
#include "api/make_ref_counted.h"
#include "api/media_stream_interface.h"
#include "api/media_types.h"
#include "api/priority.h"
#include "api/rtc_error.h"
#include "api/rtp_parameters.h"
#include "api/rtp_transceiver_direction.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "api/video/resolution.h"
#include "api/video/video_codec_type.h"
#include "api/video_codecs/scalability_mode.h"
#include "api/video_codecs/sdp_video_format.h"
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/video_decoder_factory.h"
#include "api/video_codecs/video_encoder.h"
#include "api/video_codecs/video_encoder_factory.h"
#include "call/call.h"
#include "call/packet_receiver.h"
#include "call/receive_stream.h"
#include "call/rtp_config.h"
#include "call/rtp_transport_controller_send_interface.h"
#include "call/video_send_stream.h"
#include "common_video/frame_counts.h"
#include "common_video/include/quality_limitation_reason.h"
#include "media/base/codec.h"
#include "media/base/codec_comparators.h"
#include "media/base/media_channel.h"
#include "media/base/media_constants.h"
#include "media/base/rid_description.h"
#include "media/base/rtp_utils.h"
#include "media/engine/webrtc_media_engine.h"
#include "modules/rtp_rtcp/include/receive_statistics.h"
#include "modules/rtp_rtcp/include/report_block_data.h"
#include "modules/rtp_rtcp/include/rtcp_statistics.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/rtp_util.h"
#include "modules/video_coding/svc/scalability_mode_util.h"
#include "rtc_base/checks.h"
#include "rtc_base/dscp.h"
#include "rtc_base/experiments/field_trial_parser.h"
#include "rtc_base/logging.h"
#include "rtc_base/socket.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/time_utils.h"
#include "rtc_base/trace_event.h"
namespace cricket {
namespace {
using ::webrtc::ParseRtpPayloadType;
using ::webrtc::ParseRtpSsrc;
constexpr int64_t kUnsignaledSsrcCooldownMs = rtc::kNumMillisecsPerSec / 2;
// TODO(bugs.webrtc.org/13166): Remove AV1X when backwards compatibility is not
// needed.
constexpr char kAv1xCodecName[] = "AV1X";
// This constant is really an on/off, lower-level configurable NACK history
// duration hasn't been implemented.
const int kNackHistoryMs = 1000;
const int kDefaultRtcpReceiverReportSsrc = 1;
// Minimum time interval for logging stats.
const int64_t kStatsLogIntervalMs = 10000;
const char* StreamTypeToString(
webrtc::VideoSendStream::StreamStats::StreamType type) {
switch (type) {
case webrtc::VideoSendStream::StreamStats::StreamType::kMedia:
return "kMedia";
case webrtc::VideoSendStream::StreamStats::StreamType::kRtx:
return "kRtx";
case webrtc::VideoSendStream::StreamStats::StreamType::kFlexfec:
return "kFlexfec";
}
return nullptr;
}
bool IsEnabled(const webrtc::FieldTrialsView& trials, absl::string_view name) {
return absl::StartsWith(trials.Lookup(name), "Enabled");
}
bool IsDisabled(const webrtc::FieldTrialsView& trials, absl::string_view name) {
return absl::StartsWith(trials.Lookup(name), "Disabled");
}
void AddDefaultFeedbackParams(Codec* codec,
const webrtc::FieldTrialsView& trials) {
// Don't add any feedback params for RED and ULPFEC.
if (codec->name == kRedCodecName || codec->name == kUlpfecCodecName)
return;
codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
codec->AddFeedbackParam(
FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
// Don't add any more feedback params for FLEXFEC.
if (codec->name == kFlexfecCodecName)
return;
codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamCcm, kRtcpFbCcmParamFir));
codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamNack, kRtcpFbNackParamPli));
if (codec->name == kVp8CodecName &&
IsEnabled(trials, "WebRTC-RtcpLossNotification")) {
codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamLntf, kParamValueEmpty));
}
}
// Helper function to determine whether a codec should use the [35, 63] range.
// Should be used when adding new codecs (or variants).
bool IsCodecValidForLowerRange(const Codec& codec) {
if (absl::EqualsIgnoreCase(codec.name, kFlexfecCodecName) ||
absl::EqualsIgnoreCase(codec.name, kAv1CodecName) ||
absl::EqualsIgnoreCase(codec.name, kAv1xCodecName)) {
return true;
} else if (absl::EqualsIgnoreCase(codec.name, kH264CodecName)) {
std::string profile_level_id;
std::string packetization_mode;
if (codec.GetParam(kH264FmtpProfileLevelId, &profile_level_id)) {
if (absl::StartsWithIgnoreCase(profile_level_id, "4d00")) {
if (codec.GetParam(kH264FmtpPacketizationMode, &packetization_mode)) {
return packetization_mode == "0";
}
}
// H264 with YUV444.
return absl::StartsWithIgnoreCase(profile_level_id, "f400");
}
} else if (absl::EqualsIgnoreCase(codec.name, kVp9CodecName)) {
std::string profile_id;
if (codec.GetParam(kVP9ProfileId, &profile_id)) {
if (profile_id.compare("1") == 0 || profile_id.compare("3") == 0) {
return true;
}
}
}
return false;
}
// Get the default set of supported codecs.
// is_decoder_factory is needed to keep track of the implict assumption that any
// H264 decoder also supports constrained base line profile.
// Also, is_decoder_factory is used to decide whether FlexFEC video format
// should be advertised as supported.
template <class T>
std::vector<webrtc::SdpVideoFormat> GetDefaultSupportedFormats(
const T* factory,
bool is_decoder_factory,
const webrtc::FieldTrialsView& trials) {
if (!factory) {
return {};
}
std::vector<webrtc::SdpVideoFormat> supported_formats =
factory->GetSupportedFormats();
if (is_decoder_factory) {
AddH264ConstrainedBaselineProfileToSupportedFormats(&supported_formats);
}
if (supported_formats.empty())
return supported_formats;
supported_formats.push_back(webrtc::SdpVideoFormat(kRedCodecName));
supported_formats.push_back(webrtc::SdpVideoFormat(kUlpfecCodecName));
// flexfec-03 is always supported as receive codec and as send codec
// only if WebRTC-FlexFEC-03-Advertised is enabled
if (is_decoder_factory || IsEnabled(trials, "WebRTC-FlexFEC-03-Advertised")) {
webrtc::SdpVideoFormat flexfec_format(kFlexfecCodecName);
// This value is currently arbitrarily set to 10 seconds. (The unit
// is microseconds.) This parameter MUST be present in the SDP, but
// we never use the actual value anywhere in our code however.
// TODO(brandtr): Consider honouring this value in the sender and receiver.
flexfec_format.parameters = {{kFlexfecFmtpRepairWindow, "10000000"}};
supported_formats.push_back(flexfec_format);
}
return supported_formats;
}
// This function will assign dynamic payload types (in the range [96, 127]
// and then [35, 63]) to the input codecs, and also add ULPFEC, RED, FlexFEC,
// and associated RTX codecs for recognized codecs (VP8, VP9, H264, and RED).
// It will also add default feedback params to the codecs.
std::vector<Codec> AssignPayloadTypesAndAddRtx(
const std::vector<webrtc::SdpVideoFormat>& supported_formats,
bool include_rtx,
const webrtc::FieldTrialsView& trials) {
// Due to interoperability issues with old Chrome/WebRTC versions that
// ignore the [35, 63] range prefer the lower range for new codecs.
static const int kFirstDynamicPayloadTypeLowerRange = 35;
static const int kLastDynamicPayloadTypeLowerRange = 63;
static const int kFirstDynamicPayloadTypeUpperRange = 96;
static const int kLastDynamicPayloadTypeUpperRange = 127;
int payload_type_upper = kFirstDynamicPayloadTypeUpperRange;
int payload_type_lower = kFirstDynamicPayloadTypeLowerRange;
std::vector<Codec> output_codecs;
for (const webrtc::SdpVideoFormat& format : supported_formats) {
Codec codec = cricket::CreateVideoCodec(format);
bool isFecCodec = absl::EqualsIgnoreCase(codec.name, kUlpfecCodecName) ||
absl::EqualsIgnoreCase(codec.name, kFlexfecCodecName);
// Check if we ran out of payload types.
if (payload_type_lower > kLastDynamicPayloadTypeLowerRange) {
// TODO(https://bugs.chromium.org/p/webrtc/issues/detail?id=12248):
// return an error.
RTC_LOG(LS_ERROR) << "Out of dynamic payload types [35,63] after "
"fallback from [96, 127], skipping the rest.";
RTC_DCHECK_EQ(payload_type_upper, kLastDynamicPayloadTypeUpperRange);
break;
}
// Lower range gets used for "new" codecs or when running out of payload
// types in the upper range.
if (IsCodecValidForLowerRange(codec) ||
payload_type_upper >= kLastDynamicPayloadTypeUpperRange) {
codec.id = payload_type_lower++;
} else {
codec.id = payload_type_upper++;
}
AddDefaultFeedbackParams(&codec, trials);
output_codecs.push_back(codec);
// Add associated RTX codec for non-FEC codecs.
if (include_rtx) {
if (!isFecCodec) {
// Check if we ran out of payload types.
if (payload_type_lower > kLastDynamicPayloadTypeLowerRange) {
// TODO(https://bugs.chromium.org/p/webrtc/issues/detail?id=12248):
// return an error.
RTC_LOG(LS_ERROR) << "Out of dynamic payload types [35,63] after "
"fallback from [96, 127], skipping the rest.";
RTC_DCHECK_EQ(payload_type_upper, kLastDynamicPayloadTypeUpperRange);
break;
}
if (IsCodecValidForLowerRange(codec) ||
payload_type_upper >= kLastDynamicPayloadTypeUpperRange) {
output_codecs.push_back(
cricket::CreateVideoRtxCodec(payload_type_lower++, codec.id));
} else {
output_codecs.push_back(
cricket::CreateVideoRtxCodec(payload_type_upper++, codec.id));
}
}
}
}
return output_codecs;
}
// TODO(kron): Perhaps it is better to move the implicit knowledge to the place
// where codecs are negotiated.
template <class T>
std::vector<Codec> GetPayloadTypesAndDefaultCodecs(
const T* factory,
bool is_decoder_factory,
bool include_rtx,
const webrtc::FieldTrialsView& trials) {
auto supported_formats =
GetDefaultSupportedFormats(factory, is_decoder_factory, trials);
return AssignPayloadTypesAndAddRtx(supported_formats, include_rtx, trials);
}
static std::string CodecVectorToString(const std::vector<Codec>& codecs) {
rtc::StringBuilder out;
out << "{";
for (size_t i = 0; i < codecs.size(); ++i) {
out << codecs[i].ToString();
if (i != codecs.size() - 1) {
out << ", ";
}
}
out << "}";
return out.Release();
}
static bool ValidateCodecFormats(const std::vector<Codec>& codecs) {
bool has_video = false;
for (size_t i = 0; i < codecs.size(); ++i) {
if (!codecs[i].ValidateCodecFormat()) {
return false;
}
if (codecs[i].IsMediaCodec()) {
has_video = true;
}
}
if (!has_video) {
RTC_LOG(LS_ERROR) << "Setting codecs without a video codec is invalid: "
<< CodecVectorToString(codecs);
return false;
}
return true;
}
static bool ValidateStreamParams(const StreamParams& sp) {
if (sp.ssrcs.empty()) {
RTC_LOG(LS_ERROR) << "No SSRCs in stream parameters: " << sp.ToString();
return false;
}
// Validate that a primary SSRC can only have one ssrc-group per semantics.
std::map<uint32_t, std::set<std::string>> primary_ssrc_to_semantics;
for (const auto& group : sp.ssrc_groups) {
auto result = primary_ssrc_to_semantics.try_emplace(
group.ssrcs[0], std::set<std::string>({group.semantics}));
if (!result.second) {
// A duplicate SSRC was found, check for duplicate semantics.
auto semantics_it = result.first->second.insert(group.semantics);
if (!semantics_it.second) {
RTC_LOG(LS_ERROR) << "Duplicate ssrc-group '" << group.semantics
<< " for primary SSRC " << group.ssrcs[0] << " "
<< sp.ToString();
return false;
}
}
}
std::vector<uint32_t> primary_ssrcs;
sp.GetPrimarySsrcs(&primary_ssrcs);
for (const auto& semantic :
{kFidSsrcGroupSemantics, kFecFrSsrcGroupSemantics}) {
if (!sp.has_ssrc_group(semantic)) {
continue;
}
std::vector<uint32_t> secondary_ssrcs;
sp.GetSecondarySsrcs(semantic, primary_ssrcs, &secondary_ssrcs);
for (uint32_t secondary_ssrc : secondary_ssrcs) {
bool secondary_ssrc_present = false;
for (uint32_t sp_ssrc : sp.ssrcs) {
if (sp_ssrc == secondary_ssrc) {
secondary_ssrc_present = true;
break;
}
}
if (!secondary_ssrc_present) {
RTC_LOG(LS_ERROR) << "SSRC '" << secondary_ssrc
<< "' missing from StreamParams ssrcs with semantics "
<< semantic << ": " << sp.ToString();
return false;
}
}
if (!secondary_ssrcs.empty() &&
primary_ssrcs.size() != secondary_ssrcs.size()) {
RTC_LOG(LS_ERROR)
<< semantic
<< " secondary SSRCs exist, but don't cover all SSRCs (unsupported): "
<< sp.ToString();
return false;
}
}
for (const auto& group : sp.ssrc_groups) {
if (!(group.semantics == kFidSsrcGroupSemantics ||
group.semantics == kSimSsrcGroupSemantics ||
group.semantics == kFecFrSsrcGroupSemantics)) {
continue;
}
for (uint32_t group_ssrc : group.ssrcs) {
auto it = absl::c_find_if(sp.ssrcs, [&group_ssrc](uint32_t ssrc) {
return ssrc == group_ssrc;
});
if (it == sp.ssrcs.end()) {
RTC_LOG(LS_ERROR) << "SSRC '" << group_ssrc
<< "' missing from StreamParams ssrcs with semantics "
<< group.semantics << ": " << sp.ToString();
return false;
}
}
}
return true;
}
// Returns true if the given codec is disallowed from doing simulcast.
bool IsCodecDisabledForSimulcast(bool legacy_scalability_mode,
webrtc::VideoCodecType codec_type) {
if (legacy_scalability_mode && (codec_type == webrtc::kVideoCodecVP9 ||
codec_type == webrtc::kVideoCodecAV1)) {
return true;
}
return false;
}
bool IsLayerActive(const webrtc::RtpEncodingParameters& layer) {
return layer.active &&
(!layer.max_bitrate_bps || *layer.max_bitrate_bps > 0) &&
(!layer.max_framerate || *layer.max_framerate > 0);
}
int NumActiveStreams(const webrtc::RtpParameters& rtp_parameters) {
int res = 0;
for (size_t i = 0; i < rtp_parameters.encodings.size(); ++i) {
if (rtp_parameters.encodings[i].active) {
++res;
}
}
return res;
}
std::optional<int> NumSpatialLayersFromEncoding(
const webrtc::RtpParameters& rtp_parameters,
size_t idx) {
if (idx >= rtp_parameters.encodings.size())
return std::nullopt;
std::optional<webrtc::ScalabilityMode> scalability_mode =
webrtc::ScalabilityModeFromString(
rtp_parameters.encodings[idx].scalability_mode.value_or(""));
return scalability_mode
? std::optional<int>(
ScalabilityModeToNumSpatialLayers(*scalability_mode))
: std::nullopt;
}
std::map<uint32_t, webrtc::VideoSendStream::StreamStats>
MergeInfoAboutOutboundRtpSubstreams(
const std::map<uint32_t, webrtc::VideoSendStream::StreamStats>&
substreams) {
std::map<uint32_t, webrtc::VideoSendStream::StreamStats> rtp_substreams;
// Add substreams for all RTP media streams.
for (const auto& pair : substreams) {
uint32_t ssrc = pair.first;
const webrtc::VideoSendStream::StreamStats& substream = pair.second;
switch (substream.type) {
case webrtc::VideoSendStream::StreamStats::StreamType::kMedia:
break;
case webrtc::VideoSendStream::StreamStats::StreamType::kRtx:
case webrtc::VideoSendStream::StreamStats::StreamType::kFlexfec:
continue;
}
rtp_substreams.insert(std::make_pair(ssrc, substream));
}
// Complement the kMedia substream stats with the associated kRtx and kFlexfec
// substream stats.
for (const auto& pair : substreams) {
switch (pair.second.type) {
case webrtc::VideoSendStream::StreamStats::StreamType::kMedia:
continue;
case webrtc::VideoSendStream::StreamStats::StreamType::kRtx:
case webrtc::VideoSendStream::StreamStats::StreamType::kFlexfec:
break;
}
// The associated substream is an RTX or FlexFEC substream that is
// referencing an RTP media substream.
const webrtc::VideoSendStream::StreamStats& associated_substream =
pair.second;
RTC_DCHECK(associated_substream.referenced_media_ssrc.has_value());
uint32_t media_ssrc = associated_substream.referenced_media_ssrc.value();
if (substreams.find(media_ssrc) == substreams.end()) {
RTC_LOG(LS_WARNING) << "Substream [ssrc: " << pair.first << ", type: "
<< StreamTypeToString(associated_substream.type)
<< "] is associated with a media ssrc (" << media_ssrc
<< ") that does not have StreamStats. Ignoring its "
<< "RTP stats.";
continue;
}
webrtc::VideoSendStream::StreamStats& rtp_substream =
rtp_substreams[media_ssrc];
// We only merge `rtp_stats`. All other metrics are not applicable for RTX
// and FlexFEC.
// TODO(hbos): kRtx and kFlexfec stats should use a separate struct to make
// it clear what is or is not applicable.
rtp_substream.rtp_stats.Add(associated_substream.rtp_stats);
}
return rtp_substreams;
}
bool IsActiveFromEncodings(
std::optional<uint32_t> ssrc,
const std::vector<webrtc::RtpEncodingParameters>& encodings) {
if (ssrc.has_value()) {
// Report the `active` value of a specific ssrc, or false if an encoding
// with this ssrc does not exist.
auto encoding_it = std::find_if(
encodings.begin(), encodings.end(),
[ssrc = ssrc.value()](const webrtc::RtpEncodingParameters& encoding) {
return encoding.ssrc.has_value() && encoding.ssrc.value() == ssrc;
});
return encoding_it != encodings.end() ? encoding_it->active : false;
}
// If `ssrc` is not specified then any encoding being active counts as active.
for (const auto& encoding : encodings) {
if (encoding.active) {
return true;
}
}
return false;
}
bool IsScalabilityModeSupportedByCodec(
const Codec& codec,
const std::string& scalability_mode,
const webrtc::VideoSendStream::Config& config) {
return config.encoder_settings.encoder_factory
->QueryCodecSupport(webrtc::SdpVideoFormat(codec.name, codec.params),
scalability_mode)
.is_supported;
}
// Fallback to default value if the scalability mode is unset or unsupported by
// the codec.
void FallbackToDefaultScalabilityModeIfNotSupported(
const Codec& codec,
const webrtc::VideoSendStream::Config& config,
std::vector<webrtc::RtpEncodingParameters>& encodings) {
if (!absl::c_any_of(encodings,
[](const webrtc::RtpEncodingParameters& encoding) {
return encoding.scalability_mode &&
!encoding.scalability_mode->empty();
})) {
// Fallback is only enabled if the scalability mode is configured for any of
// the encodings for now.
return;
}
if (config.encoder_settings.encoder_factory == nullptr) {
return;
}
for (auto& encoding : encodings) {
RTC_LOG(LS_INFO) << "Encoding scalability_mode: "
<< encoding.scalability_mode.value_or("-");
if (!encoding.active && !encoding.scalability_mode.has_value()) {
// Inactive encodings should not fallback since apps may only specify the
// scalability mode of the first encoding when the others are inactive.
continue;
}
if (!encoding.scalability_mode.has_value() ||
!IsScalabilityModeSupportedByCodec(codec, *encoding.scalability_mode,
config)) {
encoding.scalability_mode =
(encoding.scalability_mode !=
std::string(webrtc::kDefaultScalabilityModeStr) &&
IsScalabilityModeSupportedByCodec(
codec, webrtc::kDefaultScalabilityModeStr, config))
? webrtc::kDefaultScalabilityModeStr
: webrtc::kNoLayeringScalabilityModeStr;
RTC_LOG(LS_INFO) << " -> " << *encoding.scalability_mode;
}
}
}
// Generate the list of codec parameters to pass down based on the negotiated
// "codecs". Note that VideoCodecSettings correspond to concrete codecs like
// VP8, VP9, H264 while VideoCodecs correspond also to "virtual" codecs like
// RTX, ULPFEC, FLEXFEC.
std::vector<VideoCodecSettings> MapCodecs(const std::vector<Codec>& codecs) {
if (codecs.empty()) {
return {};
}
std::vector<VideoCodecSettings> video_codecs;
std::map<int, Codec::ResiliencyType> payload_codec_type;
// `rtx_mapping` maps video payload type to rtx payload type.
std::map<int, int> rtx_mapping;
std::map<int, int> rtx_time_mapping;
webrtc::UlpfecConfig ulpfec_config;
std::optional<int> flexfec_payload_type;
for (const Codec& in_codec : codecs) {
const int payload_type = in_codec.id;
if (payload_codec_type.find(payload_type) != payload_codec_type.end()) {
RTC_LOG(LS_ERROR) << "Payload type already registered: "
<< in_codec.ToString();
return {};
}
payload_codec_type[payload_type] = in_codec.GetResiliencyType();
switch (in_codec.GetResiliencyType()) {
case Codec::ResiliencyType::kRed: {
if (ulpfec_config.red_payload_type != -1) {
RTC_LOG(LS_ERROR)
<< "Duplicate RED codec: ignoring PT=" << payload_type
<< " in favor of PT=" << ulpfec_config.red_payload_type
<< " which was specified first.";
break;
}
ulpfec_config.red_payload_type = payload_type;
break;
}
case Codec::ResiliencyType::kUlpfec: {
if (ulpfec_config.ulpfec_payload_type != -1) {
RTC_LOG(LS_ERROR)
<< "Duplicate ULPFEC codec: ignoring PT=" << payload_type
<< " in favor of PT=" << ulpfec_config.ulpfec_payload_type
<< " which was specified first.";
break;
}
ulpfec_config.ulpfec_payload_type = payload_type;
break;
}
case Codec::ResiliencyType::kFlexfec: {
if (flexfec_payload_type) {
RTC_LOG(LS_ERROR)
<< "Duplicate FLEXFEC codec: ignoring PT=" << payload_type
<< " in favor of PT=" << *flexfec_payload_type
<< " which was specified first.";
break;
}
flexfec_payload_type = payload_type;
break;
}
case Codec::ResiliencyType::kRtx: {
int associated_payload_type;
if (!in_codec.GetParam(kCodecParamAssociatedPayloadType,
&associated_payload_type) ||
!IsValidRtpPayloadType(associated_payload_type)) {
RTC_LOG(LS_ERROR)
<< "RTX codec with invalid or no associated payload type: "
<< in_codec.ToString();
return {};
}
int rtx_time;
if (in_codec.GetParam(kCodecParamRtxTime, &rtx_time) && rtx_time > 0) {
rtx_time_mapping[associated_payload_type] = rtx_time;
}
rtx_mapping[associated_payload_type] = payload_type;
break;
}
case Codec::ResiliencyType::kNone: {
video_codecs.emplace_back(in_codec);
break;
}
}
}
// One of these codecs should have been a video codec. Only having FEC
// parameters into this code is a logic error.
RTC_DCHECK(!video_codecs.empty());
for (const auto& entry : rtx_mapping) {
const int associated_payload_type = entry.first;
const int rtx_payload_type = entry.second;
auto it = payload_codec_type.find(associated_payload_type);
if (it == payload_codec_type.end()) {
RTC_LOG(LS_ERROR) << "RTX codec (PT=" << rtx_payload_type
<< ") mapped to PT=" << associated_payload_type
<< " which is not in the codec list.";
return {};
}
const Codec::ResiliencyType associated_codec_type = it->second;
if (associated_codec_type != Codec::ResiliencyType::kNone &&
associated_codec_type != Codec::ResiliencyType::kRed) {
RTC_LOG(LS_ERROR)
<< "RTX PT=" << rtx_payload_type
<< " not mapped to regular video codec or RED codec (PT="
<< associated_payload_type << ").";
return {};
}
if (associated_payload_type == ulpfec_config.red_payload_type) {
ulpfec_config.red_rtx_payload_type = rtx_payload_type;
}
}
for (VideoCodecSettings& codec_settings : video_codecs) {
const int payload_type = codec_settings.codec.id;
codec_settings.ulpfec = ulpfec_config;
codec_settings.flexfec_payload_type = flexfec_payload_type.value_or(-1);
auto it = rtx_mapping.find(payload_type);
if (it != rtx_mapping.end()) {
const int rtx_payload_type = it->second;
codec_settings.rtx_payload_type = rtx_payload_type;
auto rtx_time_it = rtx_time_mapping.find(payload_type);
if (rtx_time_it != rtx_time_mapping.end()) {
const int rtx_time = rtx_time_it->second;
if (rtx_time < kNackHistoryMs) {
codec_settings.rtx_time = rtx_time;
} else {
codec_settings.rtx_time = kNackHistoryMs;
}
}
}
}
return video_codecs;
}
bool NonFlexfecReceiveCodecsHaveChanged(std::vector<VideoCodecSettings> before,
std::vector<VideoCodecSettings> after) {
// The receive codec order doesn't matter, so we sort the codecs before
// comparing. This is necessary because currently the
// only way to change the send codec is to munge SDP, which causes
// the receive codec list to change order, which causes the streams
// to be recreates which causes a "blink" of black video. In order
// to support munging the SDP in this way without recreating receive
// streams, we ignore the order of the received codecs so that
// changing the order doesn't cause this "blink".
auto comparison = [](const VideoCodecSettings& codec1,
const VideoCodecSettings& codec2) {
return codec1.codec.id > codec2.codec.id;
};
absl::c_sort(before, comparison);
absl::c_sort(after, comparison);
// Changes in FlexFEC payload type are handled separately in
// WebRtcVideoReceiveChannel::GetChangedReceiverParameters, so disregard
// FlexFEC in the comparison here.
return !absl::c_equal(before, after,
VideoCodecSettings::EqualsDisregardingFlexfec);
}
std::string CodecSettingsVectorToString(
const std::vector<VideoCodecSettings>& codecs) {
rtc::StringBuilder out;
out << "{";
for (size_t i = 0; i < codecs.size(); ++i) {
out << codecs[i].codec.ToString();
if (i != codecs.size() - 1) {
out << ", ";
}
}
out << "}";
return out.Release();
}
void ExtractCodecInformation(
rtc::ArrayView<const VideoCodecSettings> recv_codecs,
std::map<int, int>& rtx_associated_payload_types,
std::set<int>& raw_payload_types,
std::vector<webrtc::VideoReceiveStreamInterface::Decoder>& decoders) {
RTC_DCHECK(!recv_codecs.empty());
RTC_DCHECK(rtx_associated_payload_types.empty());
RTC_DCHECK(raw_payload_types.empty());
RTC_DCHECK(decoders.empty());
for (const VideoCodecSettings& recv_codec : recv_codecs) {
decoders.emplace_back(
webrtc::SdpVideoFormat(recv_codec.codec.name, recv_codec.codec.params),
recv_codec.codec.id);
rtx_associated_payload_types.emplace(recv_codec.rtx_payload_type,
recv_codec.codec.id);
if (recv_codec.codec.packetization == kPacketizationParamRaw) {
raw_payload_types.insert(recv_codec.codec.id);
}
}
}
int ParseReceiveBufferSize(const webrtc::FieldTrialsView& trials) {
webrtc::FieldTrialParameter<int> size_bytes("size_bytes",
kVideoRtpRecvBufferSize);
webrtc::ParseFieldTrial({&size_bytes},
trials.Lookup("WebRTC-ReceiveBufferSize"));
if (size_bytes.Get() < 10'000 || size_bytes.Get() > 10'000'000) {
RTC_LOG(LS_WARNING) << "WebRTC-ReceiveBufferSize out of bounds: "
<< size_bytes.Get();
return kVideoRtpRecvBufferSize;
}
return size_bytes.Get();
}
} // namespace
// --------------- WebRtcVideoEngine ---------------------------
WebRtcVideoEngine::WebRtcVideoEngine(
std::unique_ptr<webrtc::VideoEncoderFactory> video_encoder_factory,
std::unique_ptr<webrtc::VideoDecoderFactory> video_decoder_factory,
const webrtc::FieldTrialsView& trials)
: decoder_factory_(std::move(video_decoder_factory)),
encoder_factory_(std::move(video_encoder_factory)),
trials_(trials) {
RTC_DLOG(LS_INFO) << "WebRtcVideoEngine::WebRtcVideoEngine()";
}
WebRtcVideoEngine::~WebRtcVideoEngine() {
RTC_DLOG(LS_INFO) << "WebRtcVideoEngine::~WebRtcVideoEngine";
}
std::unique_ptr<VideoMediaSendChannelInterface>
WebRtcVideoEngine::CreateSendChannel(
webrtc::Call* call,
const MediaConfig& config,
const VideoOptions& options,
const webrtc::CryptoOptions& crypto_options,
webrtc::VideoBitrateAllocatorFactory* video_bitrate_allocator_factory) {
return std::make_unique<WebRtcVideoSendChannel>(
call, config, options, crypto_options, encoder_factory_.get(),
decoder_factory_.get(), video_bitrate_allocator_factory);
}
std::unique_ptr<VideoMediaReceiveChannelInterface>
WebRtcVideoEngine::CreateReceiveChannel(
webrtc::Call* call,
const MediaConfig& config,
const VideoOptions& options,
const webrtc::CryptoOptions& crypto_options) {
return std::make_unique<WebRtcVideoReceiveChannel>(
call, config, options, crypto_options, decoder_factory_.get());
}
std::vector<Codec> WebRtcVideoEngine::send_codecs(bool include_rtx) const {
return GetPayloadTypesAndDefaultCodecs(encoder_factory_.get(),
/*is_decoder_factory=*/false,
include_rtx, trials_);
}
std::vector<Codec> WebRtcVideoEngine::recv_codecs(bool include_rtx) const {
return GetPayloadTypesAndDefaultCodecs(decoder_factory_.get(),
/*is_decoder_factory=*/true,
include_rtx, trials_);
}
std::vector<webrtc::RtpHeaderExtensionCapability>
WebRtcVideoEngine::GetRtpHeaderExtensions() const {
std::vector<webrtc::RtpHeaderExtensionCapability> result;
// id is *not* incremented for non-default extensions, UsedIds needs to
// resolve conflicts.
int id = 1;
for (const auto& uri :
{webrtc::RtpExtension::kTimestampOffsetUri,
webrtc::RtpExtension::kAbsSendTimeUri,
webrtc::RtpExtension::kVideoRotationUri,
webrtc::RtpExtension::kTransportSequenceNumberUri,
webrtc::RtpExtension::kPlayoutDelayUri,
webrtc::RtpExtension::kVideoContentTypeUri,
webrtc::RtpExtension::kVideoTimingUri,
webrtc::RtpExtension::kColorSpaceUri, webrtc::RtpExtension::kMidUri,
webrtc::RtpExtension::kRidUri, webrtc::RtpExtension::kRepairedRidUri}) {
result.emplace_back(uri, id++, webrtc::RtpTransceiverDirection::kSendRecv);
}
result.emplace_back(webrtc::RtpExtension::kCorruptionDetectionUri, id++,
/*preferred_encrypt=*/true,
webrtc::RtpTransceiverDirection::kStopped);
for (const auto& uri : {webrtc::RtpExtension::kAbsoluteCaptureTimeUri}) {
result.emplace_back(uri, id, webrtc::RtpTransceiverDirection::kStopped);
}
result.emplace_back(webrtc::RtpExtension::kGenericFrameDescriptorUri00, id,
IsEnabled(trials_, "WebRTC-GenericDescriptorAdvertised")
? webrtc::RtpTransceiverDirection::kSendRecv
: webrtc::RtpTransceiverDirection::kStopped);
result.emplace_back(
webrtc::RtpExtension::kDependencyDescriptorUri, id,
IsEnabled(trials_, "WebRTC-DependencyDescriptorAdvertised")
? webrtc::RtpTransceiverDirection::kSendRecv
: webrtc::RtpTransceiverDirection::kStopped);
result.emplace_back(
webrtc::RtpExtension::kVideoLayersAllocationUri, id,
IsEnabled(trials_, "WebRTC-VideoLayersAllocationAdvertised")
? webrtc::RtpTransceiverDirection::kSendRecv
: webrtc::RtpTransceiverDirection::kStopped);
// VideoFrameTrackingId is a test-only extension.
if (IsEnabled(trials_, "WebRTC-VideoFrameTrackingIdAdvertised")) {
result.emplace_back(webrtc::RtpExtension::kVideoFrameTrackingIdUri, id,
webrtc::RtpTransceiverDirection::kSendRecv);
}
return result;
}
// Free function, exported for testing
std::map<uint32_t, webrtc::VideoSendStream::StreamStats>
MergeInfoAboutOutboundRtpSubstreamsForTesting(
const std::map<uint32_t, webrtc::VideoSendStream::StreamStats>&
substreams) {
return MergeInfoAboutOutboundRtpSubstreams(substreams);
}
// --------------- WebRtcVideoSendChannel ----------------------
WebRtcVideoSendChannel::WebRtcVideoSendChannel(
webrtc::Call* call,
const MediaConfig& config,
const VideoOptions& options,
const webrtc::CryptoOptions& crypto_options,
webrtc::VideoEncoderFactory* encoder_factory,
webrtc::VideoDecoderFactory* decoder_factory,
webrtc::VideoBitrateAllocatorFactory* bitrate_allocator_factory)
: MediaChannelUtil(call->network_thread(), config.enable_dscp),
worker_thread_(call->worker_thread()),
sending_(false),
receiving_(false),
call_(call),
default_sink_(nullptr),
video_config_(config.video),
encoder_factory_(encoder_factory),
decoder_factory_(decoder_factory),
bitrate_allocator_factory_(bitrate_allocator_factory),
default_send_options_(options),
last_send_stats_log_ms_(-1),
last_receive_stats_log_ms_(-1),
discard_unknown_ssrc_packets_(
IsEnabled(call_->trials(),
"WebRTC-Video-DiscardPacketsWithUnknownSsrc")),
crypto_options_(crypto_options) {
RTC_DCHECK_RUN_ON(&thread_checker_);
rtcp_receiver_report_ssrc_ = kDefaultRtcpReceiverReportSsrc;
recv_codecs_ = MapCodecs(GetPayloadTypesAndDefaultCodecs(
decoder_factory_, /*is_decoder_factory=*/true,
/*include_rtx=*/true, call_->trials()));
recv_flexfec_payload_type_ =
recv_codecs_.empty() ? 0 : recv_codecs_.front().flexfec_payload_type;
}
WebRtcVideoSendChannel::~WebRtcVideoSendChannel() {
for (auto& kv : send_streams_)
delete kv.second;
}
rtc::scoped_refptr<webrtc::VideoEncoderConfig::EncoderSpecificSettings>
WebRtcVideoSendChannel::WebRtcVideoSendStream::ConfigureVideoEncoderSettings(
const Codec& codec) {
RTC_DCHECK_RUN_ON(&thread_checker_);
bool is_screencast = parameters_.options.is_screencast.value_or(false);
// No automatic resizing when using simulcast or screencast, or when
// disabled by field trial flag.
bool automatic_resize = !disable_automatic_resize_ && !is_screencast &&
(parameters_.config.rtp.ssrcs.size() == 1 ||
NumActiveStreams(rtp_parameters_) == 1);
bool denoising;
bool codec_default_denoising = false;
if (is_screencast) {
denoising = false;
} else {
// Use codec default if video_noise_reduction is unset.
codec_default_denoising = !parameters_.options.video_noise_reduction;
denoising = parameters_.options.video_noise_reduction.value_or(false);
}
if (absl::EqualsIgnoreCase(codec.name, kH264CodecName)) {
return nullptr;
}
if (absl::EqualsIgnoreCase(codec.name, kVp8CodecName)) {
webrtc::VideoCodecVP8 vp8_settings =
webrtc::VideoEncoder::GetDefaultVp8Settings();
vp8_settings.automaticResizeOn = automatic_resize;
// VP8 denoising is enabled by default.
vp8_settings.denoisingOn = codec_default_denoising ? true : denoising;
return rtc::make_ref_counted<
webrtc::VideoEncoderConfig::Vp8EncoderSpecificSettings>(vp8_settings);
}
if (absl::EqualsIgnoreCase(codec.name, kVp9CodecName)) {
webrtc::VideoCodecVP9 vp9_settings =
webrtc::VideoEncoder::GetDefaultVp9Settings();
vp9_settings.numberOfSpatialLayers = std::min<unsigned char>(
parameters_.config.rtp.ssrcs.size(), kConferenceMaxNumSpatialLayers);
vp9_settings.numberOfTemporalLayers =
std::min<unsigned char>(parameters_.config.rtp.ssrcs.size() > 1
? kConferenceDefaultNumTemporalLayers
: 1,
kConferenceMaxNumTemporalLayers);
// VP9 denoising is disabled by default.
vp9_settings.denoisingOn = codec_default_denoising ? true : denoising;
// Disable automatic resize if more than one spatial layer is requested.
bool vp9_automatic_resize = automatic_resize;
std::optional<int> num_spatial_layers =
NumSpatialLayersFromEncoding(rtp_parameters_, /*idx=*/0);
if (num_spatial_layers && *num_spatial_layers > 1) {
vp9_automatic_resize = false;
}
vp9_settings.automaticResizeOn = vp9_automatic_resize;
if (!is_screencast) {
webrtc::FieldTrialFlag interlayer_pred_experiment_enabled("Enabled");
webrtc::FieldTrialEnum<webrtc::InterLayerPredMode> inter_layer_pred_mode(
"inter_layer_pred_mode", webrtc::InterLayerPredMode::kOnKeyPic,
{{"off", webrtc::InterLayerPredMode::kOff},
{"on", webrtc::InterLayerPredMode::kOn},
{"onkeypic", webrtc::InterLayerPredMode::kOnKeyPic}});
webrtc::ParseFieldTrial(
{&interlayer_pred_experiment_enabled, &inter_layer_pred_mode},
call_->trials().Lookup("WebRTC-Vp9InterLayerPred"));
if (interlayer_pred_experiment_enabled) {
vp9_settings.interLayerPred = inter_layer_pred_mode;
} else {
// Limit inter-layer prediction to key pictures by default.
vp9_settings.interLayerPred = webrtc::InterLayerPredMode::kOnKeyPic;
}
// TODO(webrtc:329396373): Remove after flexible mode is fully deployed.
vp9_settings.flexibleMode =
!IsDisabled(call_->trials(), "WebRTC-Video-Vp9FlexibleMode");
} else {
// Multiple spatial layers vp9 screenshare needs flexible mode.
vp9_settings.flexibleMode = vp9_settings.numberOfSpatialLayers > 1;
vp9_settings.interLayerPred = webrtc::InterLayerPredMode::kOn;
}
return rtc::make_ref_counted<
webrtc::VideoEncoderConfig::Vp9EncoderSpecificSettings>(vp9_settings);
}
if (absl::EqualsIgnoreCase(codec.name, kAv1CodecName)) {
webrtc::VideoCodecAV1 av1_settings = {.automatic_resize_on =
automatic_resize};
if (NumSpatialLayersFromEncoding(rtp_parameters_, /*idx=*/0) > 1) {
av1_settings.automatic_resize_on = false;
}
return rtc::make_ref_counted<
webrtc::VideoEncoderConfig::Av1EncoderSpecificSettings>(av1_settings);
}
return nullptr;
}
std::vector<VideoCodecSettings> WebRtcVideoSendChannel::SelectSendVideoCodecs(
const std::vector<VideoCodecSettings>& remote_mapped_codecs) const {
std::vector<webrtc::SdpVideoFormat> sdp_formats =
encoder_factory_ ? encoder_factory_->GetImplementations()
: std::vector<webrtc::SdpVideoFormat>();
// The returned vector holds the VideoCodecSettings in term of preference.
// They are orderd by receive codec preference first and local implementation
// preference second.
std::vector<VideoCodecSettings> encoders;
for (const VideoCodecSettings& remote_codec : remote_mapped_codecs) {
for (auto format_it = sdp_formats.begin();
format_it != sdp_formats.end();) {
// For H264, we will limit the encode level to the remote offered level
// regardless if level asymmetry is allowed or not. This is strictly not
// following the spec in https://tools.ietf.org/html/rfc6184#section-8.2.2
// since we should limit the encode level to the lower of local and remote
// level when level asymmetry is not allowed.
// For H.265, the level asymmetry is implicitly allowed. We need to make
// sure the encode level is set to the remote offered level.
if (format_it->IsSameCodec(
{remote_codec.codec.name, remote_codec.codec.params})) {
encoders.push_back(remote_codec);
// To allow the VideoEncoderFactory to keep information about which
// implementation to instantitate when CreateEncoder is called the two
// parmeter sets are merged.
encoders.back().codec.params.insert(format_it->parameters.begin(),
format_it->parameters.end());
format_it = sdp_formats.erase(format_it);
} else {
++format_it;
}
}
}
return encoders;
}
bool WebRtcVideoSendChannel::GetChangedSenderParameters(
const VideoSenderParameters& params,
ChangedSenderParameters* changed_params) const {
if (!ValidateCodecFormats(params.codecs) ||
!ValidateRtpExtensions(params.extensions, send_rtp_extensions_)) {
return false;
}
std::vector<VideoCodecSettings> mapped_codecs = MapCodecs(params.codecs);
if (mapped_codecs.empty()) {
// This suggests a failure in MapCodecs, e.g. inconsistent RTX codecs.
return false;
}
std::vector<VideoCodecSettings> negotiated_codecs =
SelectSendVideoCodecs(mapped_codecs);
if (params.is_stream_active && negotiated_codecs.empty()) {
// This is not a failure but will lead to the answer being rejected.
RTC_LOG(LS_ERROR) << "No video codecs in common.";
return true;
}
// Never enable sending FlexFEC, unless we are in the experiment.
if (!IsEnabled(call_->trials(), "WebRTC-FlexFEC-03")) {
for (VideoCodecSettings& codec : negotiated_codecs)
codec.flexfec_payload_type = -1;
}
std::optional<VideoCodecSettings> force_codec;
if (!send_streams_.empty()) {
// Since we do not support mixed-codec simulcast yet,
// all send streams must have the same codec value.
auto rtp_parameters = send_streams_.begin()->second->GetRtpParameters();
if (rtp_parameters.encodings[0].codec) {
auto matched_codec =
absl::c_find_if(negotiated_codecs, [&](auto negotiated_codec) {
return IsSameRtpCodec(negotiated_codec.codec,
*rtp_parameters.encodings[0].codec);
});
if (matched_codec != negotiated_codecs.end()) {
force_codec = *matched_codec;
} else {
// The requested codec has been negotiated away, we clear it from the
// parameters.
for (auto& encoding : rtp_parameters.encodings) {
encoding.codec.reset();
}
send_streams_.begin()->second->SetRtpParameters(rtp_parameters,
nullptr);
}
}
}
if (negotiated_codecs_ != negotiated_codecs) {
if (negotiated_codecs.empty()) {
changed_params->send_codec = std::nullopt;
} else if (force_codec) {
changed_params->send_codec = force_codec;
} else if (send_codec() != negotiated_codecs.front()) {
changed_params->send_codec = negotiated_codecs.front();
}
changed_params->negotiated_codecs = negotiated_codecs;
}
// For mixed-codec simulcast
std::vector<VideoCodecSettings> send_codecs;
if (!send_streams_.empty() && !negotiated_codecs.empty()) {
bool needs_update = false;
auto rtp_parameters = send_streams_.begin()->second->GetRtpParameters();
for (auto& encoding : rtp_parameters.encodings) {
if (encoding.codec) {
auto matched_codec =
absl::c_find_if(negotiated_codecs, [&](auto negotiated_codec) {
return IsSameRtpCodec(negotiated_codec.codec, *encoding.codec);
});
if (matched_codec != negotiated_codecs.end()) {
send_codecs.push_back(*matched_codec);
} else {
// The requested codec has been negotiated away, we clear it from the
// parameters.
encoding.codec.reset();
needs_update = true;
send_codecs.push_back(negotiated_codecs.front());
}
} else {
send_codecs.push_back(negotiated_codecs.front());
}
}
if (needs_update) {
send_streams_.begin()->second->SetRtpParameters(rtp_parameters, nullptr);
}
}
if (send_codecs_ != send_codecs) {
changed_params->send_codecs = send_codecs;
}
// Handle RTP header extensions.
if (params.extmap_allow_mixed != ExtmapAllowMixed()) {
changed_params->extmap_allow_mixed = params.extmap_allow_mixed;
}
std::vector<webrtc::RtpExtension> filtered_extensions = FilterRtpExtensions(
params.extensions, webrtc::RtpExtension::IsSupportedForVideo, true,
call_->trials());
if (send_rtp_extensions_ != filtered_extensions) {
changed_params->rtp_header_extensions =
std::optional<std::vector<webrtc::RtpExtension>>(filtered_extensions);
}
if (params.mid != send_params_.mid) {
changed_params->mid = params.mid;
}
// Handle max bitrate.
if (params.max_bandwidth_bps != send_params_.max_bandwidth_bps &&
params.max_bandwidth_bps >= -1) {
// 0 or -1 uncaps max bitrate.
// TODO(pbos): Reconsider how 0 should be treated. It is not mentioned as a
// special value and might very well be used for stopping sending.
changed_params->max_bandwidth_bps =
params.max_bandwidth_bps == 0 ? -1 : params.max_bandwidth_bps;
}
// Handle conference mode.
if (params.conference_mode != send_params_.conference_mode) {
changed_params->conference_mode = params.conference_mode;
}
// Handle RTCP mode.
if (params.rtcp.reduced_size != send_params_.rtcp.reduced_size) {
changed_params->rtcp_mode = params.rtcp.reduced_size
? webrtc::RtcpMode::kReducedSize
: webrtc::RtcpMode::kCompound;
}
return true;
}
bool WebRtcVideoSendChannel::SetSenderParameters(
const VideoSenderParameters& params) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoSendChannel::SetSenderParameters");
RTC_LOG(LS_INFO) << "SetSenderParameters: " << params.ToString();
ChangedSenderParameters changed_params;
if (!GetChangedSenderParameters(params, &changed_params)) {
return false;
}
if (changed_params.negotiated_codecs) {
for (const auto& send_codec : *changed_params.negotiated_codecs)
RTC_LOG(LS_INFO) << "Negotiated codec: " << send_codec.codec.ToString();
}
send_params_ = params;
return ApplyChangedParams(changed_params);
}
void WebRtcVideoSendChannel::RequestEncoderFallback() {
if (!worker_thread_->IsCurrent()) {
worker_thread_->PostTask(
SafeTask(task_safety_.flag(), [this] { RequestEncoderFallback(); }));
return;
}
RTC_DCHECK_RUN_ON(&thread_checker_);
if (negotiated_codecs_.size() <= 1) {
RTC_LOG(LS_WARNING) << "Encoder failed but no fallback codec is available";
return;
}
ChangedSenderParameters params;
params.negotiated_codecs = negotiated_codecs_;
params.negotiated_codecs->erase(params.negotiated_codecs->begin());
params.send_codec = params.negotiated_codecs->front();
ApplyChangedParams(params);
}
void WebRtcVideoSendChannel::RequestEncoderSwitch(
const webrtc::SdpVideoFormat& format,
bool allow_default_fallback) {
if (!worker_thread_->IsCurrent()) {
worker_thread_->PostTask(
SafeTask(task_safety_.flag(), [this, format, allow_default_fallback] {
RequestEncoderSwitch(format, allow_default_fallback);
}));
return;
}
RTC_DCHECK_RUN_ON(&thread_checker_);
for (const VideoCodecSettings& codec_setting : negotiated_codecs_) {
if (format.IsSameCodec(
{codec_setting.codec.name, codec_setting.codec.params})) {
VideoCodecSettings new_codec_setting = codec_setting;
for (const auto& kv : format.parameters) {
new_codec_setting.codec.params[kv.first] = kv.second;
}
if (send_codec() == new_codec_setting) {
// Already using this codec, no switch required.
return;
}
ChangedSenderParameters params;
params.send_codec = new_codec_setting;
ApplyChangedParams(params);
return;
}
}
RTC_LOG(LS_WARNING) << "Failed to switch encoder to: " << format.ToString()
<< ". Is default fallback allowed: "
<< allow_default_fallback;
if (allow_default_fallback) {
RequestEncoderFallback();
}
}
bool WebRtcVideoSendChannel::ApplyChangedParams(
const ChangedSenderParameters& changed_params) {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (changed_params.negotiated_codecs)
negotiated_codecs_ = *changed_params.negotiated_codecs;
if (changed_params.send_codec)
send_codec() = changed_params.send_codec;
if (changed_params.send_codecs)
send_codecs_ = *changed_params.send_codecs;
if (changed_params.extmap_allow_mixed) {
SetExtmapAllowMixed(*changed_params.extmap_allow_mixed);
}
if (changed_params.rtp_header_extensions) {
send_rtp_extensions_ = *changed_params.rtp_header_extensions;
}
if (changed_params.send_codec || changed_params.max_bandwidth_bps) {
if (send_params_.max_bandwidth_bps == -1) {
// Unset the global max bitrate (max_bitrate_bps) if max_bandwidth_bps is
// -1, which corresponds to no "b=AS" attribute in SDP. Note that the
// global max bitrate may be set below in GetBitrateConfigForCodec, from
// the codec max bitrate.
// TODO(pbos): This should be reconsidered (codec max bitrate should
// probably not affect global call max bitrate).
bitrate_config_.max_bitrate_bps = -1;
}
if (send_codec()) {
// TODO(holmer): Changing the codec parameters shouldn't necessarily mean
// that we change the min/max of bandwidth estimation. Reevaluate this.
bitrate_config_ = GetBitrateConfigForCodec(send_codec()->codec);
if (!changed_params.send_codec) {
// If the codec isn't changing, set the start bitrate to -1 which means
// "unchanged" so that BWE isn't affected.
bitrate_config_.start_bitrate_bps = -1;
}
}
if (send_params_.max_bandwidth_bps >= 0) {
// Note that max_bandwidth_bps intentionally takes priority over the
// bitrate config for the codec. This allows FEC to be applied above the
// codec target bitrate.
// TODO(pbos): Figure out whether b=AS means max bitrate for this
// WebRtcVideoSendChannel (in which case we're good), or per sender
// (SSRC), in which case this should not set a BitrateConstraints but
// rather reconfigure all senders.
bitrate_config_.max_bitrate_bps = send_params_.max_bandwidth_bps == 0
? -1
: send_params_.max_bandwidth_bps;
}
call_->GetTransportControllerSend()->SetSdpBitrateParameters(
bitrate_config_);
}
for (auto& kv : send_streams_) {
kv.second->SetSenderParameters(changed_params);
}
if (changed_params.send_codec || changed_params.rtcp_mode) {
if (send_codec_changed_callback_) {
send_codec_changed_callback_();
}
}
return true;
}
webrtc::RtpParameters WebRtcVideoSendChannel::GetRtpSendParameters(
uint32_t ssrc) const {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto it = send_streams_.find(ssrc);
if (it == send_streams_.end()) {
RTC_LOG(LS_WARNING) << "Attempting to get RTP send parameters for stream "
"with ssrc "
<< ssrc << " which doesn't exist.";
return webrtc::RtpParameters();
}
webrtc::RtpParameters rtp_params = it->second->GetRtpParameters();
// Need to add the common list of codecs to the send stream-specific
// RTP parameters.
for (const Codec& codec : send_params_.codecs) {
if (send_codec() && send_codec()->codec.id == codec.id) {
// Put the current send codec to the front of the codecs list.
RTC_DCHECK_EQ(codec.name, send_codec()->codec.name);
rtp_params.codecs.insert(rtp_params.codecs.begin(),
codec.ToCodecParameters());
} else {
rtp_params.codecs.push_back(codec.ToCodecParameters());
}
}
return rtp_params;
}
webrtc::RTCError WebRtcVideoSendChannel::SetRtpSendParameters(
uint32_t ssrc,
const webrtc::RtpParameters& parameters,
webrtc::SetParametersCallback callback) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoSendChannel::SetRtpSendParameters");
auto it = send_streams_.find(ssrc);
if (it == send_streams_.end()) {
RTC_LOG(LS_ERROR) << "Attempting to set RTP send parameters for stream "
"with ssrc "
<< ssrc << " which doesn't exist.";
return webrtc::InvokeSetParametersCallback(
callback, webrtc::RTCError(webrtc::RTCErrorType::INTERNAL_ERROR));
}
// TODO(deadbeef): Handle setting parameters with a list of codecs in a
// different order (which should change the send codec).
webrtc::RtpParameters current_parameters = GetRtpSendParameters(ssrc);
if (current_parameters.codecs != parameters.codecs) {
RTC_DLOG(LS_ERROR) << "Using SetParameters to change the set of codecs "
"is not currently supported.";
return webrtc::InvokeSetParametersCallback(
callback, webrtc::RTCError(webrtc::RTCErrorType::INTERNAL_ERROR));
}
if (!parameters.encodings.empty()) {
// Note that these values come from:
// https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-16#section-5
// TODO(deadbeef): Change values depending on whether we are sending a
// keyframe or non-keyframe.
rtc::DiffServCodePoint new_dscp = rtc::DSCP_DEFAULT;
switch (parameters.encodings[0].network_priority) {
case webrtc::Priority::kVeryLow:
new_dscp = rtc::DSCP_CS1;
break;
case webrtc::Priority::kLow:
new_dscp = rtc::DSCP_DEFAULT;
break;
case webrtc::Priority::kMedium:
new_dscp = rtc::DSCP_AF42;
break;
case webrtc::Priority::kHigh:
new_dscp = rtc::DSCP_AF41;
break;
}
// Since we validate that all layers have the same value, we can just check
// the first layer.
// TODO(orphis): Support mixed-codec simulcast
if (parameters.encodings[0].codec && send_codec_ &&
!IsSameRtpCodec(send_codec_->codec, *parameters.encodings[0].codec)) {
RTC_LOG(LS_VERBOSE) << "Trying to change codec to "
<< parameters.encodings[0].codec->name;
auto matched_codec =
absl::c_find_if(negotiated_codecs_, [&](auto negotiated_codec) {
return IsSameRtpCodec(negotiated_codec.codec,
*parameters.encodings[0].codec);
});
if (matched_codec == negotiated_codecs_.end()) {
return webrtc::InvokeSetParametersCallback(
callback, webrtc::RTCError(
webrtc::RTCErrorType::INVALID_MODIFICATION,
"Attempted to use an unsupported codec for layer 0"));
}
ChangedSenderParameters params;
params.send_codec = *matched_codec;
ApplyChangedParams(params);
}
SetPreferredDscp(new_dscp);
}
return it->second->SetRtpParameters(parameters, std::move(callback));
}
std::optional<Codec> WebRtcVideoSendChannel::GetSendCodec() const {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (!send_codec()) {
RTC_LOG(LS_VERBOSE) << "GetSendCodec: No send codec set.";
return std::nullopt;
}
return send_codec()->codec;
}
bool WebRtcVideoSendChannel::SetSend(bool send) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoSendChannel::SetSend");
RTC_LOG(LS_VERBOSE) << "SetSend: " << (send ? "true" : "false");
if (send && !send_codec()) {
RTC_DLOG(LS_ERROR) << "SetSend(true) called before setting codec.";
return false;
}
for (const auto& kv : send_streams_) {
kv.second->SetSend(send);
}
sending_ = send;
return true;
}
bool WebRtcVideoSendChannel::SetVideoSend(
uint32_t ssrc,
const VideoOptions* options,
rtc::VideoSourceInterface<webrtc::VideoFrame>* source) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "SetVideoSend");
RTC_DCHECK(ssrc != 0);
RTC_LOG(LS_INFO) << "SetVideoSend (ssrc= " << ssrc << ", options: "
<< (options ? options->ToString() : "nullptr")
<< ", source = " << (source ? "(source)" : "nullptr") << ")";
const auto& kv = send_streams_.find(ssrc);
if (kv == send_streams_.end()) {
// Allow unknown ssrc only if source is null.
RTC_CHECK(source == nullptr);
RTC_LOG(LS_ERROR) << "No sending stream on ssrc " << ssrc;
return false;
}
return kv->second->SetVideoSend(options, source);
}
bool WebRtcVideoSendChannel::ValidateSendSsrcAvailability(
const StreamParams& sp) const {
for (uint32_t ssrc : sp.ssrcs) {
if (send_ssrcs_.find(ssrc) != send_ssrcs_.end()) {
RTC_LOG(LS_ERROR) << "Send stream with SSRC '" << ssrc
<< "' already exists.";
return false;
}
}
return true;
}
bool WebRtcVideoSendChannel::AddSendStream(const StreamParams& sp) {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "AddSendStream: " << sp.ToString();
if (!ValidateStreamParams(sp))
return false;
if (!ValidateSendSsrcAvailability(sp))
return false;
for (uint32_t used_ssrc : sp.ssrcs)
send_ssrcs_.insert(used_ssrc);
webrtc::VideoSendStream::Config config(transport());
for (const RidDescription& rid : sp.rids()) {
config.rtp.rids.push_back(rid.rid);
}
config.suspend_below_min_bitrate = video_config_.suspend_below_min_bitrate;
config.periodic_alr_bandwidth_probing =
video_config_.periodic_alr_bandwidth_probing;
config.encoder_settings.experiment_cpu_load_estimator =
video_config_.experiment_cpu_load_estimator;
config.encoder_settings.encoder_factory = encoder_factory_;
config.encoder_settings.bitrate_allocator_factory =
bitrate_allocator_factory_;
config.encoder_settings.encoder_switch_request_callback = this;
config.crypto_options = crypto_options_;
config.rtp.extmap_allow_mixed = ExtmapAllowMixed();
config.rtcp_report_interval_ms = video_config_.rtcp_report_interval_ms;
config.rtp.enable_send_packet_batching =
video_config_.enable_send_packet_batching;
WebRtcVideoSendStream* stream = new WebRtcVideoSendStream(
call_, sp, std::move(config), default_send_options_,
video_config_.enable_cpu_adaptation, bitrate_config_.max_bitrate_bps,
send_codec(), send_codecs_, send_rtp_extensions_, send_params_);
uint32_t ssrc = sp.first_ssrc();
RTC_DCHECK(ssrc != 0);
send_streams_[ssrc] = stream;
if (ssrc_list_changed_callback_) {
ssrc_list_changed_callback_(send_ssrcs_);
}
if (sending_) {
stream->SetSend(true);
}
return true;
}
bool WebRtcVideoSendChannel::RemoveSendStream(uint32_t ssrc) {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "RemoveSendStream: " << ssrc;
WebRtcVideoSendStream* removed_stream;
auto it = send_streams_.find(ssrc);
if (it == send_streams_.end()) {
return false;
}
for (uint32_t old_ssrc : it->second->GetSsrcs())
send_ssrcs_.erase(old_ssrc);
removed_stream = it->second;
send_streams_.erase(it);
// Switch receiver report SSRCs, in case the one in use is no longer valid.
if (ssrc_list_changed_callback_) {
ssrc_list_changed_callback_(send_ssrcs_);
}
delete removed_stream;
return true;
}
bool WebRtcVideoSendChannel::GetStats(VideoMediaSendInfo* info) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoSendChannel::GetSendStats");
info->Clear();
if (send_streams_.empty()) {
return true;
}
// Log stats periodically.
bool log_stats = false;
int64_t now_ms = rtc::TimeMillis();
if (last_send_stats_log_ms_ == -1 ||
now_ms - last_send_stats_log_ms_ > kStatsLogIntervalMs) {
last_send_stats_log_ms_ = now_ms;
log_stats = true;
}
info->Clear();
FillSenderStats(info, log_stats);
FillSendCodecStats(info);
// TODO(holmer): We should either have rtt available as a metric on
// VideoSend/ReceiveStreams, or we should remove rtt from VideoSenderInfo.
webrtc::Call::Stats stats = call_->GetStats();
if (stats.rtt_ms != -1) {
for (size_t i = 0; i < info->senders.size(); ++i) {
info->senders[i].rtt_ms = stats.rtt_ms;
}
for (size_t i = 0; i < info->aggregated_senders.size(); ++i) {
info->aggregated_senders[i].rtt_ms = stats.rtt_ms;
}
}
if (log_stats)
RTC_LOG(LS_INFO) << stats.ToString(now_ms);
return true;
}
void WebRtcVideoSendChannel::FillSenderStats(
VideoMediaSendInfo* video_media_info,
bool log_stats) {
for (const auto& it : send_streams_) {
auto infos = it.second->GetPerLayerVideoSenderInfos(log_stats);
if (infos.empty())
continue;
video_media_info->aggregated_senders.push_back(
it.second->GetAggregatedVideoSenderInfo(infos));
for (auto&& info : infos) {
video_media_info->senders.push_back(info);
}
}
}
void WebRtcVideoSendChannel::FillBitrateInfo(
BandwidthEstimationInfo* bwe_info) {
RTC_DCHECK_RUN_ON(&thread_checker_);
for (const auto& it : send_streams_) {
it.second->FillBitrateInfo(bwe_info);
}
}
void WebRtcVideoSendChannel::FillSendCodecStats(
VideoMediaSendInfo* video_media_info) {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (!send_codec()) {
return;
}
// Note: since RTP stats don't account for RTX and FEC separately (see
// https://w3c.github.io/webrtc-stats/#dom-rtcstatstype-outbound-rtp)
// we can omit the codec information for those here and only insert the
// primary codec that is being used to send here.
video_media_info->send_codecs.insert(std::make_pair(
send_codec()->codec.id, send_codec()->codec.ToCodecParameters()));
}
void WebRtcVideoSendChannel::OnPacketSent(const rtc::SentPacket& sent_packet) {
RTC_DCHECK_RUN_ON(&network_thread_checker_);
// TODO(tommi): We shouldn't need to go through call_ to deliver this
// notification. We should already have direct access to
// video_send_delay_stats_ and transport_send_ptr_ via `stream_`.
// So we should be able to remove OnSentPacket from Call and handle this per
// channel instead. At the moment Call::OnSentPacket calls OnSentPacket for
// the video stats, for all sent packets, including audio, which causes
// unnecessary lookups.
call_->OnSentPacket(sent_packet);
}
void WebRtcVideoSendChannel::OnReadyToSend(bool ready) {
RTC_DCHECK_RUN_ON(&network_thread_checker_);
RTC_LOG(LS_VERBOSE) << "OnReadyToSend: " << (ready ? "Ready." : "Not ready.");
call_->SignalChannelNetworkState(
webrtc::MediaType::VIDEO,
ready ? webrtc::kNetworkUp : webrtc::kNetworkDown);
}
void WebRtcVideoSendChannel::OnNetworkRouteChanged(
absl::string_view transport_name,
const rtc::NetworkRoute& network_route) {
RTC_DCHECK_RUN_ON(&network_thread_checker_);
worker_thread_->PostTask(SafeTask(
task_safety_.flag(),
[this, name = std::string(transport_name), route = network_route] {
RTC_DCHECK_RUN_ON(&thread_checker_);
webrtc::RtpTransportControllerSendInterface* transport =
call_->GetTransportControllerSend();
transport->OnNetworkRouteChanged(name, route);
transport->OnTransportOverheadChanged(route.packet_overhead);
}));
}
void WebRtcVideoSendChannel::SetInterface(MediaChannelNetworkInterface* iface) {
RTC_DCHECK_RUN_ON(&network_thread_checker_);
MediaChannelUtil::SetInterface(iface);
// Speculative change to increase the outbound socket buffer size.
// In b/15152257, we are seeing a significant number of packets discarded
// due to lack of socket buffer space, although it's not yet clear what the
// ideal value should be.
const std::string group_name_send_buf_size =
call_->trials().Lookup("WebRTC-SendBufferSizeBytes");
int send_buffer_size = kVideoRtpSendBufferSize;
if (!group_name_send_buf_size.empty() &&
(sscanf(group_name_send_buf_size.c_str(), "%d", &send_buffer_size) != 1 ||
send_buffer_size <= 0)) {
RTC_LOG(LS_WARNING) << "Invalid send buffer size: "
<< group_name_send_buf_size;
send_buffer_size = kVideoRtpSendBufferSize;
}
MediaChannelUtil::SetOption(MediaChannelNetworkInterface::ST_RTP,
rtc::Socket::OPT_SNDBUF, send_buffer_size);
}
void WebRtcVideoSendChannel::SetFrameEncryptor(
uint32_t ssrc,
rtc::scoped_refptr<webrtc::FrameEncryptorInterface> frame_encryptor) {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto matching_stream = send_streams_.find(ssrc);
if (matching_stream != send_streams_.end()) {
matching_stream->second->SetFrameEncryptor(frame_encryptor);
} else {
RTC_LOG(LS_ERROR) << "No stream found to attach frame encryptor";
}
}
void WebRtcVideoSendChannel::SetEncoderSelector(
uint32_t ssrc,
webrtc::VideoEncoderFactory::EncoderSelectorInterface* encoder_selector) {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto matching_stream = send_streams_.find(ssrc);
if (matching_stream != send_streams_.end()) {
matching_stream->second->SetEncoderSelector(encoder_selector);
} else {
RTC_LOG(LS_ERROR) << "No stream found to attach encoder selector";
}
}
WebRtcVideoSendChannel::WebRtcVideoSendStream::VideoSendStreamParameters::
VideoSendStreamParameters(
webrtc::VideoSendStream::Config config,
const VideoOptions& options,
int max_bitrate_bps,
const std::optional<VideoCodecSettings>& codec_settings,
const std::vector<VideoCodecSettings>& codec_settings_list)
: config(std::move(config)),
options(options),
max_bitrate_bps(max_bitrate_bps),
conference_mode(false),
codec_settings(codec_settings),
codec_settings_list(codec_settings_list) {}
WebRtcVideoSendChannel::WebRtcVideoSendStream::WebRtcVideoSendStream(
webrtc::Call* call,
const StreamParams& sp,
webrtc::VideoSendStream::Config config,
const VideoOptions& options,
bool enable_cpu_overuse_detection,
int max_bitrate_bps,
const std::optional<VideoCodecSettings>& codec_settings,
const std::vector<VideoCodecSettings>& codec_settings_list,
const std::optional<std::vector<webrtc::RtpExtension>>& rtp_extensions,
// TODO(deadbeef): Don't duplicate information between send_params,
// rtp_extensions, options, etc.
const VideoSenderParameters& send_params)
: worker_thread_(call->worker_thread()),
ssrcs_(sp.ssrcs),
ssrc_groups_(sp.ssrc_groups),
call_(call),
enable_cpu_overuse_detection_(enable_cpu_overuse_detection),
source_(nullptr),
stream_(nullptr),
parameters_(std::move(config),
options,
max_bitrate_bps,
codec_settings,
codec_settings_list),
rtp_parameters_(CreateRtpParametersWithEncodings(sp)),
sending_(false),
disable_automatic_resize_(
IsEnabled(call->trials(), "WebRTC-Video-DisableAutomaticResize")) {
// Maximum packet size may come in RtpConfig from external transport, for
// example from QuicTransportInterface implementation, so do not exceed
// given max_packet_size.
parameters_.config.rtp.max_packet_size =
std::min<size_t>(parameters_.config.rtp.max_packet_size, kVideoMtu);
parameters_.conference_mode = send_params.conference_mode;
sp.GetPrimarySsrcs(&parameters_.config.rtp.ssrcs);
// ValidateStreamParams should prevent this from happening.
RTC_CHECK(!parameters_.config.rtp.ssrcs.empty());
rtp_parameters_.encodings[0].ssrc = parameters_.config.rtp.ssrcs[0];
// RTX.
sp.GetFidSsrcs(parameters_.config.rtp.ssrcs,
&parameters_.config.rtp.rtx.ssrcs);
// FlexFEC SSRCs.
// TODO(brandtr): This code needs to be generalized when we add support for
// multistream protection.
if (IsEnabled(call_->trials(), "WebRTC-FlexFEC-03")) {
uint32_t flexfec_ssrc;
bool flexfec_enabled = false;
for (uint32_t primary_ssrc : parameters_.config.rtp.ssrcs) {
if (sp.GetFecFrSsrc(primary_ssrc, &flexfec_ssrc)) {
if (flexfec_enabled) {
RTC_LOG(LS_INFO)
<< "Multiple FlexFEC streams in local SDP, but "
"our implementation only supports a single FlexFEC "
"stream. Will not enable FlexFEC for proposed "
"stream with SSRC: "
<< flexfec_ssrc << ".";
continue;
}
flexfec_enabled = true;
parameters_.config.rtp.flexfec.ssrc = flexfec_ssrc;
parameters_.config.rtp.flexfec.protected_media_ssrcs = {primary_ssrc};
}
}
}
parameters_.config.rtp.c_name = sp.cname;
if (rtp_extensions) {
parameters_.config.rtp.extensions = *rtp_extensions;
rtp_parameters_.header_extensions = *rtp_extensions;
}
parameters_.config.rtp.rtcp_mode = send_params.rtcp.reduced_size
? webrtc::RtcpMode::kReducedSize
: webrtc::RtcpMode::kCompound;
parameters_.config.rtp.mid = send_params.mid;
rtp_parameters_.rtcp.reduced_size = send_params.rtcp.reduced_size;
if (codec_settings) {
SetCodec(*codec_settings, codec_settings_list);
}
}
WebRtcVideoSendChannel::WebRtcVideoSendStream::~WebRtcVideoSendStream() {
if (stream_ != NULL) {
call_->DestroyVideoSendStream(stream_);
}
}
bool WebRtcVideoSendChannel::WebRtcVideoSendStream::SetVideoSend(
const VideoOptions* options,
rtc::VideoSourceInterface<webrtc::VideoFrame>* source) {
TRACE_EVENT0("webrtc", "WebRtcVideoSendStream::SetVideoSend");
RTC_DCHECK_RUN_ON(&thread_checker_);
bool reconfiguration_needed = false;
if (options) {
VideoOptions old_options = parameters_.options;
parameters_.options.SetAll(*options);
if (parameters_.options.is_screencast.value_or(false) !=
old_options.is_screencast.value_or(false) &&
parameters_.codec_settings) {
// If screen content settings change, we may need to recreate the codec
// instance so that the correct type is used.
SetCodec(*parameters_.codec_settings, parameters_.codec_settings_list);
// Mark screenshare parameter as being updated, then test for any other
// changes that may require codec reconfiguration.
old_options.is_screencast = options->is_screencast;
}
if (parameters_.options != old_options) {
reconfiguration_needed = true;
}
}
if (source_ && stream_) {
stream_->SetSource(nullptr, webrtc::DegradationPreference::DISABLED);
if (source && source != source_) {
reconfiguration_needed = true;
}
}
if (reconfiguration_needed) {
ReconfigureEncoder(nullptr);
}
// Switch to the new source.
source_ = source;
if (source && stream_) {
stream_->SetSource(source_, GetDegradationPreference());
}
return true;
}
webrtc::DegradationPreference
WebRtcVideoSendChannel::WebRtcVideoSendStream::GetDegradationPreference()
const {
// Do not adapt resolution for screen content as this will likely
// result in blurry and unreadable text.
// `this` acts like a VideoSource to make sure SinkWants are handled on the
// correct thread.
if (!enable_cpu_overuse_detection_) {
return webrtc::DegradationPreference::DISABLED;
}
webrtc::DegradationPreference degradation_preference;
if (rtp_parameters_.degradation_preference.has_value()) {
degradation_preference = *rtp_parameters_.degradation_preference;
} else {
if (parameters_.options.content_hint ==
webrtc::VideoTrackInterface::ContentHint::kFluid) {
degradation_preference =
webrtc::DegradationPreference::MAINTAIN_FRAMERATE;
} else if (parameters_.options.is_screencast.value_or(false) ||
parameters_.options.content_hint ==
webrtc::VideoTrackInterface::ContentHint::kDetailed ||
parameters_.options.content_hint ==
webrtc::VideoTrackInterface::ContentHint::kText) {
degradation_preference =
webrtc::DegradationPreference::MAINTAIN_RESOLUTION;
} else if (IsEnabled(call_->trials(), "WebRTC-Video-BalancedDegradation")) {
// Standard wants balanced by default, but it needs to be tuned first.
degradation_preference = webrtc::DegradationPreference::BALANCED;
} else {
// Keep MAINTAIN_FRAMERATE by default until BALANCED has been tuned for
// all codecs and launched.
degradation_preference =
webrtc::DegradationPreference::MAINTAIN_FRAMERATE;
}
}
return degradation_preference;
}
const std::vector<uint32_t>&
WebRtcVideoSendChannel::WebRtcVideoSendStream::GetSsrcs() const {
return ssrcs_;
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::SetCodec(
const VideoCodecSettings& codec_settings,
const std::vector<VideoCodecSettings>& codec_settings_list) {
RTC_DCHECK_RUN_ON(&thread_checker_);
FallbackToDefaultScalabilityModeIfNotSupported(
codec_settings.codec, parameters_.config, rtp_parameters_.encodings);
parameters_.encoder_config = CreateVideoEncoderConfig(codec_settings.codec);
RTC_DCHECK_GT(parameters_.encoder_config.number_of_streams, 0);
parameters_.config.rtp.payload_name = codec_settings.codec.name;
parameters_.config.rtp.payload_type = codec_settings.codec.id;
parameters_.config.rtp.raw_payload =
codec_settings.codec.packetization == kPacketizationParamRaw;
parameters_.config.rtp.ulpfec = codec_settings.ulpfec;
parameters_.config.rtp.flexfec.payload_type =
codec_settings.flexfec_payload_type;
// Set RTX payload type if RTX is enabled.
if (!parameters_.config.rtp.rtx.ssrcs.empty()) {
if (codec_settings.rtx_payload_type == -1) {
RTC_LOG(LS_WARNING)
<< "RTX SSRCs configured but there's no configured RTX "
"payload type. Ignoring.";
parameters_.config.rtp.rtx.ssrcs.clear();
} else {
parameters_.config.rtp.rtx.payload_type = codec_settings.rtx_payload_type;
}
}
const bool has_lntf = HasLntf(codec_settings.codec);
parameters_.config.rtp.lntf.enabled = has_lntf;
parameters_.config.encoder_settings.capabilities.loss_notification = has_lntf;
parameters_.config.rtp.nack.rtp_history_ms =
HasNack(codec_settings.codec) ? kNackHistoryMs : 0;
parameters_.codec_settings = codec_settings;
// Settings for mixed-codec simulcast
if (!codec_settings_list.empty()) {
RTC_DCHECK_EQ(parameters_.config.rtp.ssrcs.size(),
codec_settings_list.size());
parameters_.config.rtp.stream_configs.resize(
parameters_.config.rtp.ssrcs.size());
for (size_t i = 0; i < codec_settings_list.size(); i++) {
auto& stream_config = parameters_.config.rtp.stream_configs[i];
const auto& cs = codec_settings_list[i];
stream_config.ssrc = parameters_.config.rtp.ssrcs[i];
if (i < parameters_.config.rtp.rids.size()) {
stream_config.rid = parameters_.config.rtp.rids[i];
}
stream_config.payload_name = cs.codec.name;
stream_config.payload_type = cs.codec.id;
stream_config.raw_payload =
cs.codec.packetization == kPacketizationParamRaw;
if (i < parameters_.config.rtp.rtx.ssrcs.size()) {
auto& rtx = stream_config.rtx.emplace(
decltype(stream_config.rtx)::value_type());
rtx.ssrc = parameters_.config.rtp.rtx.ssrcs[i];
rtx.payload_type = cs.rtx_payload_type;
}
}
}
parameters_.codec_settings_list = codec_settings_list;
// TODO(bugs.webrtc.org/8830): Avoid recreation, it should be enough to call
// ReconfigureEncoder.
RTC_LOG(LS_INFO) << "RecreateWebRtcStream (send) because of SetCodec.";
RecreateWebRtcStream();
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::SetSenderParameters(
const ChangedSenderParameters& params) {
RTC_DCHECK_RUN_ON(&thread_checker_);
// `recreate_stream` means construction-time parameters have changed and the
// sending stream needs to be reset with the new config.
bool recreate_stream = false;
if (params.rtcp_mode) {
parameters_.config.rtp.rtcp_mode = *params.rtcp_mode;
rtp_parameters_.rtcp.reduced_size =
parameters_.config.rtp.rtcp_mode == webrtc::RtcpMode::kReducedSize;
recreate_stream = true;
}
if (params.extmap_allow_mixed) {
parameters_.config.rtp.extmap_allow_mixed = *params.extmap_allow_mixed;
recreate_stream = true;
}
if (params.rtp_header_extensions) {
parameters_.config.rtp.extensions = *params.rtp_header_extensions;
rtp_parameters_.header_extensions = *params.rtp_header_extensions;
recreate_stream = true;
}
if (params.mid) {
parameters_.config.rtp.mid = *params.mid;
recreate_stream = true;
}
if (params.max_bandwidth_bps) {
parameters_.max_bitrate_bps = *params.max_bandwidth_bps;
ReconfigureEncoder(nullptr);
}
if (params.conference_mode) {
parameters_.conference_mode = *params.conference_mode;
}
// Set codecs and options.
if (params.send_codec) {
SetCodec(*params.send_codec,
params.send_codecs.value_or(parameters_.codec_settings_list));
recreate_stream = false; // SetCodec has already recreated the stream.
} else if (params.conference_mode && parameters_.codec_settings) {
SetCodec(*parameters_.codec_settings, parameters_.codec_settings_list);
recreate_stream = false; // SetCodec has already recreated the stream.
}
if (recreate_stream) {
RTC_LOG(LS_INFO)
<< "RecreateWebRtcStream (send) because of SetSenderParameters";
RecreateWebRtcStream();
}
}
webrtc::RTCError
WebRtcVideoSendChannel::WebRtcVideoSendStream::SetRtpParameters(
const webrtc::RtpParameters& new_parameters,
webrtc::SetParametersCallback callback) {
RTC_DCHECK_RUN_ON(&thread_checker_);
// This is checked higher in the stack (RtpSender), so this is only checking
// for users accessing the private APIs or tests, not specification
// conformance.
// TODO(orphis): Migrate tests to later make this a DCHECK only
webrtc::RTCError error = CheckRtpParametersInvalidModificationAndValues(
rtp_parameters_, new_parameters, call_->trials());
if (!error.ok()) {
return webrtc::InvokeSetParametersCallback(callback, error);
}
bool new_param = false;
for (size_t i = 0; i < rtp_parameters_.encodings.size(); ++i) {
if ((new_parameters.encodings[i].min_bitrate_bps !=
rtp_parameters_.encodings[i].min_bitrate_bps) ||
(new_parameters.encodings[i].max_bitrate_bps !=
rtp_parameters_.encodings[i].max_bitrate_bps) ||
(new_parameters.encodings[i].max_framerate !=
rtp_parameters_.encodings[i].max_framerate) ||
(new_parameters.encodings[i].scale_resolution_down_by !=
rtp_parameters_.encodings[i].scale_resolution_down_by) ||
(new_parameters.encodings[i].num_temporal_layers !=
rtp_parameters_.encodings[i].num_temporal_layers) ||
(new_parameters.encodings[i].scale_resolution_down_to !=
rtp_parameters_.encodings[i].scale_resolution_down_to) ||
(new_parameters.encodings[i].scalability_mode !=
rtp_parameters_.encodings[i].scalability_mode) ||
(new_parameters.encodings[i].codec !=
rtp_parameters_.encodings[i].codec)) {
new_param = true;
break;
}
}
bool new_degradation_preference = false;
if (new_parameters.degradation_preference !=
rtp_parameters_.degradation_preference) {
new_degradation_preference = true;
}
// Some fields (e.g. bitrate priority) only need to update the bitrate
// allocator which is updated via ReconfigureEncoder (however, note that the
// actual encoder should only be reconfigured if needed).
bool reconfigure_encoder =
new_param || (new_parameters.encodings[0].bitrate_priority !=
rtp_parameters_.encodings[0].bitrate_priority);
// Note that the simulcast encoder adapter relies on the fact that layers
// de/activation triggers encoder reinitialization.
bool new_send_state = false;
for (size_t i = 0; i < rtp_parameters_.encodings.size(); ++i) {
bool new_active = IsLayerActive(new_parameters.encodings[i]);
bool old_active = IsLayerActive(rtp_parameters_.encodings[i]);
if (new_active != old_active) {
new_send_state = true;
}
}
rtp_parameters_ = new_parameters;
// Codecs are currently handled at the WebRtcVideoSendChannel level.
rtp_parameters_.codecs.clear();
if (reconfigure_encoder || new_send_state) {
// Callback responsibility is delegated to ReconfigureEncoder()
ReconfigureEncoder(std::move(callback));
callback = nullptr;
}
if (new_degradation_preference) {
if (source_ && stream_) {
stream_->SetSource(source_, GetDegradationPreference());
}
}
// Check if a key frame was requested via setParameters.
std::vector<std::string> key_frames_requested_by_rid;
for (const auto& encoding : rtp_parameters_.encodings) {
if (encoding.request_key_frame) {
key_frames_requested_by_rid.push_back(encoding.rid);
}
}
if (!key_frames_requested_by_rid.empty()) {
if (key_frames_requested_by_rid.size() == 1 &&
key_frames_requested_by_rid[0] == "") {
// For non-simulcast cases there is no rid,
// request a keyframe on all layers.
key_frames_requested_by_rid.clear();
}
GenerateKeyFrame(key_frames_requested_by_rid);
}
return webrtc::InvokeSetParametersCallback(callback, webrtc::RTCError::OK());
}
webrtc::RtpParameters
WebRtcVideoSendChannel::WebRtcVideoSendStream::GetRtpParameters() const {
RTC_DCHECK_RUN_ON(&thread_checker_);
return rtp_parameters_;
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::SetFrameEncryptor(
rtc::scoped_refptr<webrtc::FrameEncryptorInterface> frame_encryptor) {
RTC_DCHECK_RUN_ON(&thread_checker_);
parameters_.config.frame_encryptor = frame_encryptor;
if (stream_) {
RTC_LOG(LS_INFO)
<< "RecreateWebRtcStream (send) because of SetFrameEncryptor, ssrc="
<< parameters_.config.rtp.ssrcs[0];
RecreateWebRtcStream();
}
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::SetEncoderSelector(
webrtc::VideoEncoderFactory::EncoderSelectorInterface* encoder_selector) {
RTC_DCHECK_RUN_ON(&thread_checker_);
parameters_.config.encoder_selector = encoder_selector;
if (stream_) {
RTC_LOG(LS_INFO)
<< "RecreateWebRtcStream (send) because of SetEncoderSelector, ssrc="
<< parameters_.config.rtp.ssrcs[0];
RecreateWebRtcStream();
}
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::UpdateSendState() {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (sending_) {
RTC_DCHECK(stream_ != nullptr);
// This allows the the Stream to be used. Ie, DTLS is connected and the
// RtpTransceiver direction allows sending.
stream_->Start();
} else {
if (stream_ != nullptr) {
stream_->Stop();
}
}
}
webrtc::VideoEncoderConfig
WebRtcVideoSendChannel::WebRtcVideoSendStream::CreateVideoEncoderConfig(
const Codec& codec) const {
RTC_DCHECK_RUN_ON(&thread_checker_);
webrtc::VideoEncoderConfig encoder_config;
encoder_config.codec_type = webrtc::PayloadStringToCodecType(codec.name);
encoder_config.video_format =
webrtc::SdpVideoFormat(codec.name, codec.params);
bool is_screencast = parameters_.options.is_screencast.value_or(false);
if (is_screencast) {
encoder_config.min_transmit_bitrate_bps =
1000 * parameters_.options.screencast_min_bitrate_kbps.value_or(0);
encoder_config.content_type =
webrtc::VideoEncoderConfig::ContentType::kScreen;
} else {
encoder_config.min_transmit_bitrate_bps = 0;
encoder_config.content_type =
webrtc::VideoEncoderConfig::ContentType::kRealtimeVideo;
}
// By default, the stream count for the codec configuration should match the
// number of negotiated ssrcs but this may be capped below depending on the
// `legacy_scalability_mode` and codec used.
encoder_config.number_of_streams = parameters_.config.rtp.ssrcs.size();
bool legacy_scalability_mode = true;
for (const webrtc::RtpEncodingParameters& encoding :
rtp_parameters_.encodings) {
if (encoding.scalability_mode.has_value() &&
(encoding.scale_resolution_down_by.has_value() ||
encoding.scale_resolution_down_to.has_value())) {
legacy_scalability_mode = false;
break;
}
}
// Maybe limit the number of simulcast layers depending on
// `legacy_scalability_mode`, codec types (VP9/AV1). This path only exists
// for backwards compatibility and will one day be deleted. If you want SVC,
// please specify with the `scalability_mode` API instead amd disabling all
// but one encoding.
if (IsCodecDisabledForSimulcast(legacy_scalability_mode,
encoder_config.codec_type)) {
encoder_config.number_of_streams = 1;
}
// parameters_.max_bitrate comes from the max bitrate set at the SDP
// (m-section) level with the attribute "b=AS." Note that stream max bitrate
// is the RtpSender's max bitrate, but each individual encoding may also have
// its own max bitrate specified by SetParameters.
int stream_max_bitrate = parameters_.max_bitrate_bps;
// The codec max bitrate comes from the "x-google-max-bitrate" parameter
// attribute set in the SDP for a specific codec. It only has an effect if
// max bitrate is not specified through other means.
bool encodings_has_max_bitrate = false;
for (const auto& encoding : rtp_parameters_.encodings) {
if (encoding.active && encoding.max_bitrate_bps.value_or(0) > 0) {
encodings_has_max_bitrate = true;
break;
}
}
int codec_max_bitrate_kbps;
if (codec.GetParam(kCodecParamMaxBitrate, &codec_max_bitrate_kbps) &&
stream_max_bitrate == -1 && !encodings_has_max_bitrate) {
stream_max_bitrate = codec_max_bitrate_kbps * 1000;
}
encoder_config.max_bitrate_bps = stream_max_bitrate;
// The encoder config's default bitrate priority is set to 1.0,
// unless it is set through the sender's encoding parameters.
// The bitrate priority, which is used in the bitrate allocation, is done
// on a per sender basis, so we use the first encoding's value.
encoder_config.bitrate_priority =
rtp_parameters_.encodings[0].bitrate_priority;
// Application-controlled state is held in the encoder_config's
// simulcast_layers. Currently this is used to control which simulcast layers
// are active and for configuring the min/max bitrate and max framerate.
// The encoder_config's simulcast_layers is also used for non-simulcast (when
// there is a single layer).
RTC_DCHECK_GE(rtp_parameters_.encodings.size(),
encoder_config.number_of_streams);
RTC_DCHECK_GT(encoder_config.number_of_streams, 0);
// Copy all provided constraints.
encoder_config.simulcast_layers.resize(rtp_parameters_.encodings.size());
for (size_t i = 0; i < encoder_config.simulcast_layers.size(); ++i) {
encoder_config.simulcast_layers[i].active =
rtp_parameters_.encodings[i].active;
encoder_config.simulcast_layers[i].scalability_mode =
webrtc::ScalabilityModeFromString(
rtp_parameters_.encodings[i].scalability_mode.value_or(""));
if (rtp_parameters_.encodings[i].min_bitrate_bps) {
encoder_config.simulcast_layers[i].min_bitrate_bps =
*rtp_parameters_.encodings[i].min_bitrate_bps;
}
if (rtp_parameters_.encodings[i].max_bitrate_bps) {
encoder_config.simulcast_layers[i].max_bitrate_bps =
*rtp_parameters_.encodings[i].max_bitrate_bps;
}
if (rtp_parameters_.encodings[i].max_framerate) {
encoder_config.simulcast_layers[i].max_framerate =
*rtp_parameters_.encodings[i].max_framerate;
}
if (rtp_parameters_.encodings[i].scale_resolution_down_by) {
encoder_config.simulcast_layers[i].scale_resolution_down_by =
*rtp_parameters_.encodings[i].scale_resolution_down_by;
}
if (rtp_parameters_.encodings[i].num_temporal_layers) {
encoder_config.simulcast_layers[i].num_temporal_layers =
*rtp_parameters_.encodings[i].num_temporal_layers;
}
encoder_config.simulcast_layers[i].scale_resolution_down_to =
rtp_parameters_.encodings[i].scale_resolution_down_to;
}
encoder_config.legacy_conference_mode = parameters_.conference_mode;
encoder_config.is_quality_scaling_allowed =
!disable_automatic_resize_ && !is_screencast &&
(parameters_.config.rtp.ssrcs.size() == 1 ||
NumActiveStreams(rtp_parameters_) == 1);
// Ensure frame dropping is always enabled.
encoder_config.frame_drop_enabled = true;
int max_qp = -1;
if (codec.GetParam(kCodecParamMaxQuantization, &max_qp) && max_qp > 0) {
encoder_config.max_qp = max_qp;
}
return encoder_config;
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::ReconfigureEncoder(
webrtc::SetParametersCallback callback) {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (!stream_) {
// The webrtc::VideoSendStream `stream_` has not yet been created but other
// parameters has changed.
webrtc::InvokeSetParametersCallback(callback, webrtc::RTCError::OK());
return;
}
RTC_DCHECK_GT(parameters_.encoder_config.number_of_streams, 0);
RTC_CHECK(parameters_.codec_settings);
VideoCodecSettings codec_settings = *parameters_.codec_settings;
FallbackToDefaultScalabilityModeIfNotSupported(
codec_settings.codec, parameters_.config, rtp_parameters_.encodings);
// Latest config, with and without encoder specfic settings.
webrtc::VideoEncoderConfig encoder_config =
CreateVideoEncoderConfig(codec_settings.codec);
encoder_config.encoder_specific_settings =
ConfigureVideoEncoderSettings(codec_settings.codec);
webrtc::VideoEncoderConfig encoder_config_with_specifics =
encoder_config.Copy();
encoder_config.encoder_specific_settings = nullptr;
// When switching between legacy SVC (3 encodings interpreted as 1 stream with
// 3 spatial layers) and the standard API (3 encodings = 3 streams and spatial
// layers specified by `scalability_mode`), the number of streams can change.
bool num_streams_changed = parameters_.encoder_config.number_of_streams !=
encoder_config.number_of_streams;
parameters_.encoder_config = std::move(encoder_config);
if (num_streams_changed) {
// The app is switching between legacy and standard modes, recreate instead
// of reconfiguring to avoid number of streams not matching in lower layers.
RecreateWebRtcStream();
webrtc::InvokeSetParametersCallback(callback, webrtc::RTCError::OK());
return;
}
stream_->ReconfigureVideoEncoder(std::move(encoder_config_with_specifics),
std::move(callback));
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::SetSend(bool send) {
RTC_DCHECK_RUN_ON(&thread_checker_);
sending_ = send;
UpdateSendState();
}
std::vector<VideoSenderInfo>
WebRtcVideoSendChannel::WebRtcVideoSendStream::GetPerLayerVideoSenderInfos(
bool log_stats) {
RTC_DCHECK_RUN_ON(&thread_checker_);
VideoSenderInfo common_info;
if (parameters_.codec_settings) {
common_info.codec_name = parameters_.codec_settings->codec.name;
common_info.codec_payload_type = parameters_.codec_settings->codec.id;
}
std::vector<VideoSenderInfo> infos;
webrtc::VideoSendStream::Stats stats;
if (stream_ == nullptr) {
for (uint32_t ssrc : parameters_.config.rtp.ssrcs) {
common_info.add_ssrc(ssrc);
}
infos.push_back(common_info);
return infos;
} else {
stats = stream_->GetStats();
if (log_stats)
RTC_LOG(LS_INFO) << stats.ToString(rtc::TimeMillis());
// Metrics that are in common for all substreams.
common_info.adapt_changes = stats.number_of_cpu_adapt_changes;
common_info.adapt_reason =
stats.cpu_limited_resolution ? ADAPTREASON_CPU : ADAPTREASON_NONE;
common_info.has_entered_low_resolution = stats.has_entered_low_resolution;
// Get bandwidth limitation info from stream_->GetStats().
// Input resolution (output from video_adapter) can be further scaled down
// or higher video layer(s) can be dropped due to bitrate constraints.
// Note, adapt_changes only include changes from the video_adapter.
if (stats.bw_limited_resolution)
common_info.adapt_reason |= ADAPTREASON_BANDWIDTH;
common_info.quality_limitation_reason = stats.quality_limitation_reason;
common_info.quality_limitation_durations_ms =
stats.quality_limitation_durations_ms;
common_info.quality_limitation_resolution_changes =
stats.quality_limitation_resolution_changes;
common_info.encoder_implementation_name = stats.encoder_implementation_name;
common_info.target_bitrate = stats.target_media_bitrate_bps;
common_info.ssrc_groups = ssrc_groups_;
common_info.frames = stats.frames;
common_info.framerate_input = stats.input_frame_rate;
common_info.avg_encode_ms = stats.avg_encode_time_ms;
common_info.encode_usage_percent = stats.encode_usage_percent;
common_info.nominal_bitrate = stats.media_bitrate_bps;
common_info.content_type = stats.content_type;
common_info.aggregated_framerate_sent = stats.encode_frame_rate;
common_info.aggregated_huge_frames_sent = stats.huge_frames_sent;
common_info.power_efficient_encoder = stats.power_efficient_encoder;
// The normal case is that substreams are present, handled below. But if
// substreams are missing (can happen before negotiated/connected where we
// have no stats yet) a single outbound-rtp is created representing any and
// all layers.
if (stats.substreams.empty()) {
for (uint32_t ssrc : parameters_.config.rtp.ssrcs) {
common_info.add_ssrc(ssrc);
}
common_info.active =
IsActiveFromEncodings(std::nullopt, rtp_parameters_.encodings);
common_info.framerate_sent = stats.encode_frame_rate;
common_info.frames_encoded = stats.frames_encoded;
common_info.total_encode_time_ms = stats.total_encode_time_ms;
common_info.total_encoded_bytes_target = stats.total_encoded_bytes_target;
common_info.frames_sent = stats.frames_encoded;
common_info.huge_frames_sent = stats.huge_frames_sent;
infos.push_back(common_info);
return infos;
}
}
// Merge `stats.substreams`, which may contain additional SSRCs for RTX or
// Flexfec, with media SSRCs. This results in a set of substreams that match
// with the outbound-rtp stats objects.
auto outbound_rtp_substreams =
MergeInfoAboutOutboundRtpSubstreams(stats.substreams);
// If SVC is used, one stream is configured but multiple encodings exist. This
// is not spec-compliant, but it is how we've implemented SVC so this affects
// how the RTP stream's "active" value is determined.
bool is_svc = (parameters_.encoder_config.number_of_streams == 1 &&
rtp_parameters_.encodings.size() > 1);
for (const auto& pair : outbound_rtp_substreams) {
auto info = common_info;
uint32_t ssrc = pair.first;
info.add_ssrc(ssrc);
info.rid = parameters_.config.rtp.GetRidForSsrc(ssrc);
info.active = IsActiveFromEncodings(
!is_svc ? std::optional<uint32_t>(ssrc) : std::nullopt,
rtp_parameters_.encodings);
auto stream_stats = pair.second;
RTC_DCHECK_EQ(stream_stats.type,
webrtc::VideoSendStream::StreamStats::StreamType::kMedia);
info.payload_bytes_sent = stream_stats.rtp_stats.transmitted.payload_bytes;
info.header_and_padding_bytes_sent =
stream_stats.rtp_stats.transmitted.header_bytes +
stream_stats.rtp_stats.transmitted.padding_bytes;
info.packets_sent = stream_stats.rtp_stats.transmitted.packets;
info.total_packet_send_delay +=
stream_stats.rtp_stats.transmitted.total_packet_delay;
info.send_frame_width = stream_stats.width;
info.send_frame_height = stream_stats.height;
info.key_frames_encoded = stream_stats.frame_counts.key_frames;
info.framerate_sent = stream_stats.encode_frame_rate;
info.frames_encoded = stream_stats.frames_encoded;
info.frames_sent = stream_stats.frames_encoded;
info.retransmitted_bytes_sent =
stream_stats.rtp_stats.retransmitted.payload_bytes;
info.retransmitted_packets_sent =
stream_stats.rtp_stats.retransmitted.packets;
info.firs_received = stream_stats.rtcp_packet_type_counts.fir_packets;
info.nacks_received = stream_stats.rtcp_packet_type_counts.nack_packets;
info.plis_received = stream_stats.rtcp_packet_type_counts.pli_packets;
if (stream_stats.report_block_data.has_value()) {
info.packets_lost = stream_stats.report_block_data->cumulative_lost();
info.fraction_lost = stream_stats.report_block_data->fraction_lost();
info.report_block_datas.push_back(*stream_stats.report_block_data);
}
info.qp_sum = stream_stats.qp_sum;
info.total_encode_time_ms = stream_stats.total_encode_time_ms;
info.total_encoded_bytes_target = stream_stats.total_encoded_bytes_target;
info.huge_frames_sent = stream_stats.huge_frames_sent;
info.scalability_mode = stream_stats.scalability_mode;
infos.push_back(info);
}
return infos;
}
VideoSenderInfo
WebRtcVideoSendChannel::WebRtcVideoSendStream::GetAggregatedVideoSenderInfo(
const std::vector<VideoSenderInfo>& infos) const {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_CHECK(!infos.empty());
if (infos.size() == 1) {
return infos[0];
}
VideoSenderInfo info = infos[0];
info.local_stats.clear();
for (uint32_t ssrc : parameters_.config.rtp.ssrcs) {
info.add_ssrc(ssrc);
}
info.framerate_sent = info.aggregated_framerate_sent;
info.huge_frames_sent = info.aggregated_huge_frames_sent;
for (size_t i = 1; i < infos.size(); i++) {
info.key_frames_encoded += infos[i].key_frames_encoded;
info.payload_bytes_sent += infos[i].payload_bytes_sent;
info.header_and_padding_bytes_sent +=
infos[i].header_and_padding_bytes_sent;
info.packets_sent += infos[i].packets_sent;
info.total_packet_send_delay += infos[i].total_packet_send_delay;
info.retransmitted_bytes_sent += infos[i].retransmitted_bytes_sent;
info.retransmitted_packets_sent += infos[i].retransmitted_packets_sent;
info.packets_lost += infos[i].packets_lost;
if (infos[i].send_frame_width > info.send_frame_width)
info.send_frame_width = infos[i].send_frame_width;
if (infos[i].send_frame_height > info.send_frame_height)
info.send_frame_height = infos[i].send_frame_height;
info.firs_received += infos[i].firs_received;
info.nacks_received += infos[i].nacks_received;
info.plis_received += infos[i].plis_received;
if (infos[i].report_block_datas.size())
info.report_block_datas.push_back(infos[i].report_block_datas[0]);
if (infos[i].qp_sum) {
if (!info.qp_sum) {
info.qp_sum = 0;
}
info.qp_sum = *info.qp_sum + *infos[i].qp_sum;
}
info.frames_encoded += infos[i].frames_encoded;
info.frames_sent += infos[i].frames_sent;
info.total_encode_time_ms += infos[i].total_encode_time_ms;
info.total_encoded_bytes_target += infos[i].total_encoded_bytes_target;
}
return info;
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::FillBitrateInfo(
BandwidthEstimationInfo* bwe_info) {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (stream_ == NULL) {
return;
}
webrtc::VideoSendStream::Stats stats = stream_->GetStats();
for (const auto& it : stats.substreams) {
bwe_info->transmit_bitrate += it.second.total_bitrate_bps;
bwe_info->retransmit_bitrate += it.second.retransmit_bitrate_bps;
}
bwe_info->target_enc_bitrate += stats.target_media_bitrate_bps;
bwe_info->actual_enc_bitrate += stats.media_bitrate_bps;
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::
SetEncoderToPacketizerFrameTransformer(
rtc::scoped_refptr<webrtc::FrameTransformerInterface>
frame_transformer) {
RTC_DCHECK_RUN_ON(&thread_checker_);
parameters_.config.frame_transformer = std::move(frame_transformer);
if (stream_)
RecreateWebRtcStream();
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::RecreateWebRtcStream() {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (stream_ != NULL) {
call_->DestroyVideoSendStream(stream_);
}
RTC_CHECK(parameters_.codec_settings);
RTC_DCHECK_EQ((parameters_.encoder_config.content_type ==
webrtc::VideoEncoderConfig::ContentType::kScreen),
parameters_.options.is_screencast.value_or(false))
<< "encoder content type inconsistent with screencast option";
parameters_.encoder_config.encoder_specific_settings =
ConfigureVideoEncoderSettings(parameters_.codec_settings->codec);
webrtc::VideoSendStream::Config config = parameters_.config.Copy();
if (!config.rtp.rtx.ssrcs.empty() && config.rtp.rtx.payload_type == -1) {
RTC_LOG(LS_WARNING) << "RTX SSRCs configured but there's no configured RTX "
"payload type the set codec. Ignoring RTX.";
config.rtp.rtx.ssrcs.clear();
}
if (parameters_.encoder_config.number_of_streams == 1) {
// SVC is used instead of simulcast. Remove unnecessary SSRCs.
if (config.rtp.ssrcs.size() > 1) {
config.rtp.ssrcs.resize(1);
if (config.rtp.rtx.ssrcs.size() > 1) {
config.rtp.rtx.ssrcs.resize(1);
}
}
}
if (webrtc::RtpExtension::FindHeaderExtensionByUri(
config.rtp.extensions, webrtc::RtpExtension::kCorruptionDetectionUri,
webrtc::RtpExtension::kRequireEncryptedExtension)) {
config.encoder_settings.enable_frame_instrumentation_generator = true;
}
stream_ = call_->CreateVideoSendStream(std::move(config),
parameters_.encoder_config.Copy());
parameters_.encoder_config.encoder_specific_settings = NULL;
// Calls stream_->StartPerRtpStream() to start the VideoSendStream
// if necessary conditions are met.
UpdateSendState();
// Attach the source after starting the send stream to prevent frames from
// being injected into a not-yet initializated video stream encoder.
if (source_) {
stream_->SetSource(source_, GetDegradationPreference());
}
}
void WebRtcVideoSendChannel::WebRtcVideoSendStream::GenerateKeyFrame(
const std::vector<std::string>& rids) {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (stream_ != NULL) {
stream_->GenerateKeyFrame(rids);
} else {
RTC_LOG(LS_WARNING)
<< "Absent send stream; ignoring request to generate keyframe.";
}
}
void WebRtcVideoSendChannel::GenerateSendKeyFrame(
uint32_t ssrc,
const std::vector<std::string>& rids) {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto it = send_streams_.find(ssrc);
if (it != send_streams_.end()) {
it->second->GenerateKeyFrame(rids);
} else {
RTC_LOG(LS_ERROR)
<< "Absent send stream; ignoring key frame generation for ssrc "
<< ssrc;
}
}
void WebRtcVideoSendChannel::SetEncoderToPacketizerFrameTransformer(
uint32_t ssrc,
rtc::scoped_refptr<webrtc::FrameTransformerInterface> frame_transformer) {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto matching_stream = send_streams_.find(ssrc);
if (matching_stream != send_streams_.end()) {
matching_stream->second->SetEncoderToPacketizerFrameTransformer(
std::move(frame_transformer));
}
}
// ------------------------ WebRtcVideoReceiveChannel ---------------------
WebRtcVideoReceiveChannel::WebRtcVideoReceiveChannel(
webrtc::Call* call,
const MediaConfig& config,
const VideoOptions& options,
const webrtc::CryptoOptions& crypto_options,
webrtc::VideoDecoderFactory* decoder_factory)
: MediaChannelUtil(call->network_thread(), config.enable_dscp),
worker_thread_(call->worker_thread()),
receiving_(false),
call_(call),
default_sink_(nullptr),
video_config_(config.video),
decoder_factory_(decoder_factory),
default_send_options_(options),
last_receive_stats_log_ms_(-1),
discard_unknown_ssrc_packets_(
IsEnabled(call_->trials(),
"WebRTC-Video-DiscardPacketsWithUnknownSsrc")),
crypto_options_(crypto_options),
receive_buffer_size_(ParseReceiveBufferSize(call_->trials())) {
RTC_DCHECK_RUN_ON(&thread_checker_);
rtcp_receiver_report_ssrc_ = kDefaultRtcpReceiverReportSsrc;
recv_codecs_ = MapCodecs(GetPayloadTypesAndDefaultCodecs(
decoder_factory_, /*is_decoder_factory=*/true,
/*include_rtx=*/true, call_->trials()));
recv_flexfec_payload_type_ =
recv_codecs_.empty() ? 0 : recv_codecs_.front().flexfec_payload_type;
}
WebRtcVideoReceiveChannel::~WebRtcVideoReceiveChannel() {
for (auto& kv : receive_streams_)
delete kv.second;
}
void WebRtcVideoReceiveChannel::SetReceiverFeedbackParameters(
bool lntf_enabled,
bool nack_enabled,
webrtc::RtcpMode rtcp_mode,
std::optional<int> rtx_time) {
RTC_DCHECK_RUN_ON(&thread_checker_);
// Update receive feedback parameters from new codec or RTCP mode.
for (auto& kv : receive_streams_) {
RTC_DCHECK(kv.second != nullptr);
kv.second->SetFeedbackParameters(lntf_enabled, nack_enabled, rtcp_mode,
rtx_time);
}
// Store for future creation of receive streams
rtp_config_.lntf.enabled = lntf_enabled;
if (nack_enabled) {
rtp_config_.nack.rtp_history_ms = kNackHistoryMs;
} else {
rtp_config_.nack.rtp_history_ms = 0;
}
rtp_config_.rtcp_mode = rtcp_mode;
// Note: There is no place in config to store rtx_time.
}
webrtc::RtpParameters WebRtcVideoReceiveChannel::GetRtpReceiverParameters(
uint32_t ssrc) const {
RTC_DCHECK_RUN_ON(&thread_checker_);
webrtc::RtpParameters rtp_params;
auto it = receive_streams_.find(ssrc);
if (it == receive_streams_.end()) {
RTC_LOG(LS_WARNING)
<< "Attempting to get RTP receive parameters for stream "
"with SSRC "
<< ssrc << " which doesn't exist.";
return webrtc::RtpParameters();
}
rtp_params = it->second->GetRtpParameters();
rtp_params.header_extensions = recv_rtp_extensions_;
// Add codecs, which any stream is prepared to receive.
for (const Codec& codec : recv_params_.codecs) {
rtp_params.codecs.push_back(codec.ToCodecParameters());
}
return rtp_params;
}
webrtc::RtpParameters
WebRtcVideoReceiveChannel::GetDefaultRtpReceiveParameters() const {
RTC_DCHECK_RUN_ON(&thread_checker_);
webrtc::RtpParameters rtp_params;
if (!default_sink_) {
// Getting parameters on a default, unsignaled video receive stream but
// because we've not configured to receive such a stream, `encodings` is
// empty.
return rtp_params;
}
rtp_params.encodings.emplace_back();
// Add codecs, which any stream is prepared to receive.
for (const Codec& codec : recv_params_.codecs) {
rtp_params.codecs.push_back(codec.ToCodecParameters());
}
return rtp_params;
}
bool WebRtcVideoReceiveChannel::GetChangedReceiverParameters(
const VideoReceiverParameters& params,
ChangedReceiverParameters* changed_params) const {
if (!ValidateCodecFormats(params.codecs) ||
!ValidateRtpExtensions(params.extensions, recv_rtp_extensions_)) {
return false;
}
// Handle receive codecs.
const std::vector<VideoCodecSettings> mapped_codecs =
MapCodecs(params.codecs);
if (mapped_codecs.empty()) {
RTC_LOG(LS_ERROR)
<< "GetChangedReceiverParameters called without any video codecs.";
return false;
}
// Verify that every mapped codec is supported locally.
if (params.is_stream_active) {
const std::vector<Codec> local_supported_codecs =
GetPayloadTypesAndDefaultCodecs(decoder_factory_,
/*is_decoder_factory=*/true,
/*include_rtx=*/true, call_->trials());
for (const VideoCodecSettings& mapped_codec : mapped_codecs) {
if (!FindMatchingVideoCodec(local_supported_codecs, mapped_codec.codec)) {
RTC_LOG(LS_ERROR) << "GetChangedReceiverParameters called with "
"unsupported video codec: "
<< mapped_codec.codec.ToString();
return false;
}
}
}
if (NonFlexfecReceiveCodecsHaveChanged(recv_codecs_, mapped_codecs)) {
changed_params->codec_settings =
std::optional<std::vector<VideoCodecSettings>>(mapped_codecs);
}
// Handle RTP header extensions.
std::vector<webrtc::RtpExtension> filtered_extensions = FilterRtpExtensions(
params.extensions, webrtc::RtpExtension::IsSupportedForVideo, false,
call_->trials());
if (filtered_extensions != recv_rtp_extensions_) {
changed_params->rtp_header_extensions =
std::optional<std::vector<webrtc::RtpExtension>>(filtered_extensions);
}
int flexfec_payload_type = mapped_codecs.front().flexfec_payload_type;
if (flexfec_payload_type != recv_flexfec_payload_type_) {
changed_params->flexfec_payload_type = flexfec_payload_type;
}
return true;
}
bool WebRtcVideoReceiveChannel::SetReceiverParameters(
const VideoReceiverParameters& params) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoReceiveChannel::SetReceiverParameters");
RTC_LOG(LS_INFO) << "SetReceiverParameters: " << params.ToString();
ChangedReceiverParameters changed_params;
if (!GetChangedReceiverParameters(params, &changed_params)) {
return false;
}
if (changed_params.flexfec_payload_type) {
RTC_DLOG(LS_INFO) << "Changing FlexFEC payload type (recv) from "
<< recv_flexfec_payload_type_ << " to "
<< *changed_params.flexfec_payload_type;
recv_flexfec_payload_type_ = *changed_params.flexfec_payload_type;
}
if (changed_params.rtp_header_extensions) {
recv_rtp_extensions_ = *changed_params.rtp_header_extensions;
recv_rtp_extension_map_ =
webrtc::RtpHeaderExtensionMap(recv_rtp_extensions_);
}
if (changed_params.codec_settings) {
RTC_DLOG(LS_INFO) << "Changing recv codecs from "
<< CodecSettingsVectorToString(recv_codecs_) << " to "
<< CodecSettingsVectorToString(
*changed_params.codec_settings);
recv_codecs_ = *changed_params.codec_settings;
}
for (auto& kv : receive_streams_) {
kv.second->SetReceiverParameters(changed_params);
}
recv_params_ = params;
return true;
}
void WebRtcVideoReceiveChannel::SetReceiverReportSsrc(uint32_t ssrc) {
RTC_DCHECK_RUN_ON(&thread_checker_);
if (ssrc == rtcp_receiver_report_ssrc_)
return;
rtcp_receiver_report_ssrc_ = ssrc;
for (auto& [unused, receive_stream] : receive_streams_)
receive_stream->SetLocalSsrc(ssrc);
}
void WebRtcVideoReceiveChannel::ChooseReceiverReportSsrc(
const std::set<uint32_t>& choices) {
RTC_DCHECK_RUN_ON(&thread_checker_);
// If we can continue using the current receiver report, do so.
if (choices.find(rtcp_receiver_report_ssrc_) != choices.end()) {
return;
}
// Go back to the default if list has been emptied.
if (choices.empty()) {
SetReceiverReportSsrc(kDefaultRtcpReceiverReportSsrc);
return;
}
// Any number is as good as any other.
SetReceiverReportSsrc(*choices.begin());
}
void WebRtcVideoReceiveChannel::SetReceive(bool receive) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoReceiveChannel::SetReceive");
RTC_LOG(LS_VERBOSE) << "SetReceive: " << (receive ? "true" : "false");
for (const auto& kv : receive_streams_) {
if (receive) {
kv.second->StartReceiveStream();
} else {
kv.second->StopReceiveStream();
}
}
receiving_ = receive;
}
bool WebRtcVideoReceiveChannel::ValidateReceiveSsrcAvailability(
const StreamParams& sp) const {
for (uint32_t ssrc : sp.ssrcs) {
if (receive_ssrcs_.find(ssrc) != receive_ssrcs_.end()) {
RTC_LOG(LS_ERROR) << "Receive stream with SSRC '" << ssrc
<< "' already exists.";
return false;
}
}
return true;
}
void WebRtcVideoReceiveChannel::DeleteReceiveStream(
WebRtcVideoReceiveStream* stream) {
for (uint32_t old_ssrc : stream->GetSsrcs())
receive_ssrcs_.erase(old_ssrc);
delete stream;
}
bool WebRtcVideoReceiveChannel::AddRecvStream(const StreamParams& sp) {
return AddRecvStream(sp, false);
}
bool WebRtcVideoReceiveChannel::AddRecvStream(const StreamParams& sp,
bool default_stream) {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "AddRecvStream"
<< (default_stream ? " (default stream)" : "") << ": "
<< sp.ToString();
if (!sp.has_ssrcs()) {
// This is a StreamParam with unsignaled SSRCs. Store it, so it can be used
// later when we know the SSRC on the first packet arrival.
unsignaled_stream_params_ = sp;
return true;
}
if (!ValidateStreamParams(sp))
return false;
for (uint32_t ssrc : sp.ssrcs) {
// Remove running stream if this was a default stream.
const auto& prev_stream = receive_streams_.find(ssrc);
if (prev_stream != receive_streams_.end()) {
if (default_stream || !prev_stream->second->IsDefaultStream()) {
RTC_LOG(LS_ERROR) << "Receive stream for SSRC '" << ssrc
<< "' already exists.";
return false;
}
DeleteReceiveStream(prev_stream->second);
receive_streams_.erase(prev_stream);
}
}
if (!ValidateReceiveSsrcAvailability(sp))
return false;
for (uint32_t used_ssrc : sp.ssrcs)
receive_ssrcs_.insert(used_ssrc);
webrtc::VideoReceiveStreamInterface::Config config(transport(),
decoder_factory_);
webrtc::FlexfecReceiveStream::Config flexfec_config(transport());
ConfigureReceiverRtp(&config, &flexfec_config, sp);
config.crypto_options = crypto_options_;
config.enable_prerenderer_smoothing =
video_config_.enable_prerenderer_smoothing;
if (!sp.stream_ids().empty()) {
config.sync_group = sp.stream_ids()[0];
}
if (unsignaled_frame_transformer_ && !config.frame_transformer)
config.frame_transformer = unsignaled_frame_transformer_;
auto receive_stream =
new WebRtcVideoReceiveStream(call_, sp, std::move(config), default_stream,
recv_codecs_, flexfec_config);
if (receiving_) {
receive_stream->StartReceiveStream();
}
receive_streams_[sp.first_ssrc()] = receive_stream;
return true;
}
void WebRtcVideoReceiveChannel::ConfigureReceiverRtp(
webrtc::VideoReceiveStreamInterface::Config* config,
webrtc::FlexfecReceiveStream::Config* flexfec_config,
const StreamParams& sp) const {
uint32_t ssrc = sp.first_ssrc();
config->rtp.remote_ssrc = ssrc;
config->rtp.local_ssrc = rtcp_receiver_report_ssrc_;
// TODO(pbos): This protection is against setting the same local ssrc as
// remote which is not permitted by the lower-level API. RTCP requires a
// corresponding sender SSRC. Figure out what to do when we don't have
// (receive-only) or know a good local SSRC.
if (config->rtp.remote_ssrc == config->rtp.local_ssrc) {
if (config->rtp.local_ssrc != kDefaultRtcpReceiverReportSsrc) {
config->rtp.local_ssrc = kDefaultRtcpReceiverReportSsrc;
} else {
config->rtp.local_ssrc = kDefaultRtcpReceiverReportSsrc + 1;
}
}
// The mode and rtx time is determined by a call to the configuration
// function.
config->rtp.rtcp_mode = rtp_config_.rtcp_mode;
sp.GetFidSsrc(ssrc, &config->rtp.rtx_ssrc);
// TODO(brandtr): Generalize when we add support for multistream protection.
flexfec_config->payload_type = recv_flexfec_payload_type_;
if (!IsDisabled(call_->trials(), "WebRTC-FlexFEC-03-Advertised") &&
sp.GetFecFrSsrc(ssrc, &flexfec_config->rtp.remote_ssrc)) {
flexfec_config->protected_media_ssrcs = {ssrc};
flexfec_config->rtp.local_ssrc = config->rtp.local_ssrc;
flexfec_config->rtcp_mode = config->rtp.rtcp_mode;
}
}
bool WebRtcVideoReceiveChannel::RemoveRecvStream(uint32_t ssrc) {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "RemoveRecvStream: " << ssrc;
auto stream = receive_streams_.find(ssrc);
if (stream == receive_streams_.end()) {
RTC_LOG(LS_ERROR) << "Stream not found for ssrc: " << ssrc;
return false;
}
DeleteReceiveStream(stream->second);
receive_streams_.erase(stream);
return true;
}
void WebRtcVideoReceiveChannel::ResetUnsignaledRecvStream() {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "ResetUnsignaledRecvStream.";
unsignaled_stream_params_ = StreamParams();
last_unsignalled_ssrc_creation_time_ms_ = std::nullopt;
// Delete any created default streams. This is needed to avoid SSRC collisions
// in Call's RtpDemuxer, in the case that `this` has created a default video
// receiver, and then some other WebRtcVideoReceiveChannel gets the SSRC
// signaled in the corresponding Unified Plan "m=" section.
auto it = receive_streams_.begin();
while (it != receive_streams_.end()) {
if (it->second->IsDefaultStream()) {
DeleteReceiveStream(it->second);
receive_streams_.erase(it++);
} else {
++it;
}
}
}
std::optional<uint32_t> WebRtcVideoReceiveChannel::GetUnsignaledSsrc() const {
RTC_DCHECK_RUN_ON(&thread_checker_);
std::optional<uint32_t> ssrc;
for (auto it = receive_streams_.begin(); it != receive_streams_.end(); ++it) {
if (it->second->IsDefaultStream()) {
ssrc.emplace(it->first);
break;
}
}
return ssrc;
}
void WebRtcVideoReceiveChannel::OnDemuxerCriteriaUpdatePending() {
RTC_DCHECK_RUN_ON(&thread_checker_);
++demuxer_criteria_id_;
}
void WebRtcVideoReceiveChannel::OnDemuxerCriteriaUpdateComplete() {
RTC_DCHECK_RUN_ON(&thread_checker_);
++demuxer_criteria_completed_id_;
}
bool WebRtcVideoReceiveChannel::SetSink(
uint32_t ssrc,
rtc::VideoSinkInterface<webrtc::VideoFrame>* sink) {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "SetSink: ssrc:" << ssrc << " "
<< (sink ? "(ptr)" : "nullptr");
auto it = receive_streams_.find(ssrc);
if (it == receive_streams_.end()) {
return false;
}
it->second->SetSink(sink);
return true;
}
void WebRtcVideoReceiveChannel::SetDefaultSink(
rtc::VideoSinkInterface<webrtc::VideoFrame>* sink) {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_LOG(LS_INFO) << "SetDefaultSink: " << (sink ? "(ptr)" : "nullptr");
default_sink_ = sink;
}
bool WebRtcVideoReceiveChannel::GetStats(VideoMediaReceiveInfo* info) {
RTC_DCHECK_RUN_ON(&thread_checker_);
TRACE_EVENT0("webrtc", "WebRtcVideoReceiveChannel::GetStats");
info->Clear();
if (receive_streams_.empty()) {
return true;
}
// Log stats periodically.
bool log_stats = false;
int64_t now_ms = rtc::TimeMillis();
if (last_receive_stats_log_ms_ == -1 ||
now_ms - last_receive_stats_log_ms_ > kStatsLogIntervalMs) {
last_receive_stats_log_ms_ = now_ms;
log_stats = true;
}
FillReceiverStats(info, log_stats);
FillReceiveCodecStats(info);
return true;
}
void WebRtcVideoReceiveChannel::FillReceiverStats(
VideoMediaReceiveInfo* video_media_info,
bool log_stats) {
for (const auto& it : receive_streams_) {
video_media_info->receivers.push_back(
it.second->GetVideoReceiverInfo(log_stats));
}
}
void WebRtcVideoReceiveChannel::FillReceiveCodecStats(
VideoMediaReceiveInfo* video_media_info) {
for (const auto& receiver : video_media_info->receivers) {
auto codec =
absl::c_find_if(recv_params_.codecs, [&receiver](const Codec& c) {
return receiver.codec_payload_type &&
*receiver.codec_payload_type == c.id;
});
if (codec != recv_params_.codecs.end()) {
video_media_info->receive_codecs.insert(
std::make_pair(codec->id, codec->ToCodecParameters()));
}
}
}
void WebRtcVideoReceiveChannel::OnPacketReceived(
const webrtc::RtpPacketReceived& packet) {
// Note: the network_thread_checker may refer to the worker thread if the two
// threads are combined, but this is either always true or always false
// depending on configuration set at object initialization.
RTC_DCHECK_RUN_ON(&network_thread_checker_);
// TODO(crbug.com/1373439): Stop posting to the worker thread when the
// combined network/worker project launches.
if (webrtc::TaskQueueBase::Current() != worker_thread_) {
worker_thread_->PostTask(
SafeTask(task_safety_.flag(), [this, packet = packet]() mutable {
RTC_DCHECK_RUN_ON(&thread_checker_);
ProcessReceivedPacket(std::move(packet));
}));
} else {
RTC_DCHECK_RUN_ON(&thread_checker_);
ProcessReceivedPacket(packet);
}
}
bool WebRtcVideoReceiveChannel::MaybeCreateDefaultReceiveStream(
const webrtc::RtpPacketReceived& packet) {
if (discard_unknown_ssrc_packets_) {
return false;
}
if (packet.PayloadType() == recv_flexfec_payload_type_) {
return false;
}
// Ignore unknown ssrcs if there is a demuxer criteria update pending.
// During a demuxer update we may receive ssrcs that were recently
// removed or we may receve ssrcs that were recently configured for a
// different video channel.
if (demuxer_criteria_id_ != demuxer_criteria_completed_id_) {
return false;
}
// See if this payload_type is registered as one that usually gets its
// own SSRC (RTX) or at least is safe to drop either way (FEC). If it
// is, and it wasn't handled above by DeliverPacket, that means we don't
// know what stream it associates with, and we shouldn't ever create an
// implicit channel for these.
bool is_rtx_payload = false;
for (auto& codec : recv_codecs_) {
if (packet.PayloadType() == codec.ulpfec.red_rtx_payload_type ||
packet.PayloadType() == codec.ulpfec.ulpfec_payload_type) {
return false;
}
if (packet.PayloadType() == codec.rtx_payload_type) {
is_rtx_payload = true;
break;
}
}
if (is_rtx_payload) {
// As we don't support receiving simulcast there can only be one RTX
// stream, which will be associated with unsignaled media stream.
std::optional<uint32_t> current_default_ssrc = GetUnsignaledSsrc();
if (current_default_ssrc) {
FindReceiveStream(*current_default_ssrc)->UpdateRtxSsrc(packet.Ssrc());
return true;
}
// Default media SSRC not known yet. Drop the packet.
// BWE has already been notified of this received packet.
return false;
}
// Ignore unknown ssrcs if we recently created an unsignalled receive
// stream since this shouldn't happen frequently. Getting into a state
// of creating decoders on every packet eats up processing time (e.g.
// https://crbug.com/1069603) and this cooldown prevents that.
if (last_unsignalled_ssrc_creation_time_ms_.has_value()) {
int64_t now_ms = rtc::TimeMillis();
if (now_ms - last_unsignalled_ssrc_creation_time_ms_.value() <
kUnsignaledSsrcCooldownMs) {
// We've already created an unsignalled ssrc stream within the last
// 0.5 s, ignore with a warning.
RTC_LOG(LS_WARNING)
<< "Another unsignalled ssrc packet arrived shortly after the "
<< "creation of an unsignalled ssrc stream. Dropping packet.";
return false;
}
}
// RTX SSRC not yet known.
ReCreateDefaultReceiveStream(packet.Ssrc(), std::nullopt);
last_unsignalled_ssrc_creation_time_ms_ = rtc::TimeMillis();
return true;
}
void WebRtcVideoReceiveChannel::ReCreateDefaultReceiveStream(
uint32_t ssrc,
std::optional<uint32_t> rtx_ssrc) {
RTC_DCHECK_RUN_ON(&thread_checker_);
std::optional<uint32_t> default_recv_ssrc = GetUnsignaledSsrc();
if (default_recv_ssrc) {
RTC_LOG(LS_INFO) << "Destroying old default receive stream for SSRC="
<< ssrc << ".";
RemoveRecvStream(*default_recv_ssrc);
}
StreamParams sp = unsignaled_stream_params();
sp.ssrcs.push_back(ssrc);
if (rtx_ssrc) {
sp.AddFidSsrc(ssrc, *rtx_ssrc);
}
RTC_LOG(LS_INFO) << "Creating default receive stream for SSRC=" << ssrc
<< ".";
if (!AddRecvStream(sp, /*default_stream=*/true)) {
RTC_LOG(LS_WARNING) << "Could not create default receive stream.";
}
// SSRC 0 returns default_recv_base_minimum_delay_ms.
const int unsignaled_ssrc = 0;
int default_recv_base_minimum_delay_ms =
GetBaseMinimumPlayoutDelayMs(unsignaled_ssrc).value_or(0);
// Set base minimum delay if it was set before for the default receive
// stream.
SetBaseMinimumPlayoutDelayMs(ssrc, default_recv_base_minimum_delay_ms);
SetSink(ssrc, default_sink_);
}
void WebRtcVideoReceiveChannel::SetInterface(
MediaChannelNetworkInterface* iface) {
RTC_DCHECK_RUN_ON(&network_thread_checker_);
MediaChannelUtil::SetInterface(iface);
// Set the RTP recv/send buffer to a bigger size.
MediaChannelUtil::SetOption(MediaChannelNetworkInterface::ST_RTP,
rtc::Socket::OPT_RCVBUF, receive_buffer_size_);
}
void WebRtcVideoReceiveChannel::SetFrameDecryptor(
uint32_t ssrc,
rtc::scoped_refptr<webrtc::FrameDecryptorInterface> frame_decryptor) {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto matching_stream = receive_streams_.find(ssrc);
if (matching_stream != receive_streams_.end()) {
matching_stream->second->SetFrameDecryptor(frame_decryptor);
}
}
bool WebRtcVideoReceiveChannel::SetBaseMinimumPlayoutDelayMs(uint32_t ssrc,
int delay_ms) {
RTC_DCHECK_RUN_ON(&thread_checker_);
std::optional<uint32_t> default_ssrc = GetUnsignaledSsrc();
// SSRC of 0 represents the default receive stream.
if (ssrc == 0) {
default_recv_base_minimum_delay_ms_ = delay_ms;
}
if (ssrc == 0 && !default_ssrc) {
return true;
}
if (ssrc == 0 && default_ssrc) {
ssrc = default_ssrc.value();
}
auto stream = receive_streams_.find(ssrc);
if (stream != receive_streams_.end()) {
stream->second->SetBaseMinimumPlayoutDelayMs(delay_ms);
return true;
} else {
RTC_LOG(LS_ERROR) << "No stream found to set base minimum playout delay";
return false;
}
}
std::optional<int> WebRtcVideoReceiveChannel::GetBaseMinimumPlayoutDelayMs(
uint32_t ssrc) const {
RTC_DCHECK_RUN_ON(&thread_checker_);
// SSRC of 0 represents the default receive stream.
if (ssrc == 0) {
return default_recv_base_minimum_delay_ms_;
}
auto stream = receive_streams_.find(ssrc);
if (stream != receive_streams_.end()) {
return stream->second->GetBaseMinimumPlayoutDelayMs();
} else {
RTC_LOG(LS_ERROR) << "No stream found to get base minimum playout delay";
return std::nullopt;
}
}
std::vector<webrtc::RtpSource> WebRtcVideoReceiveChannel::GetSources(
uint32_t ssrc) const {
RTC_DCHECK_RUN_ON(&thread_checker_);
auto it = receive_streams_.find(ssrc);
if (it == receive_streams_.end()) {
// TODO(bugs.webrtc.org/9781): Investigate standard compliance
// with sources for streams that has been removed.
RTC_LOG(LS_ERROR) << "Attempting to get contributing sources for SSRC:"
<< ssrc << " which doesn't exist.";
return {};
}
return it->second->GetSources();
}
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::WebRtcVideoReceiveStream(
webrtc::Call* call,
const StreamParams& sp,
webrtc::VideoReceiveStreamInterface::Config config,
bool default_stream,
const std::vector<VideoCodecSettings>& recv_codecs,
const webrtc::FlexfecReceiveStream::Config& flexfec_config)
: call_(call),
stream_params_(sp),
stream_(NULL),
default_stream_(default_stream),
config_(std::move(config)),
flexfec_config_(flexfec_config),
flexfec_stream_(nullptr),
sink_(NULL),
first_frame_timestamp_(-1),
estimated_remote_start_ntp_time_ms_(0),
receiving_(false) {
RTC_DCHECK(config_.decoder_factory);
RTC_DCHECK(config_.decoders.empty())
<< "Decoder info is supplied via `recv_codecs`";
ExtractCodecInformation(recv_codecs, config_.rtp.rtx_associated_payload_types,
config_.rtp.raw_payload_types, config_.decoders);
const VideoCodecSettings& codec = recv_codecs.front();
config_.rtp.ulpfec_payload_type = codec.ulpfec.ulpfec_payload_type;
config_.rtp.red_payload_type = codec.ulpfec.red_payload_type;
config_.rtp.lntf.enabled = HasLntf(codec.codec);
config_.rtp.nack.rtp_history_ms = HasNack(codec.codec) ? kNackHistoryMs : 0;
if (codec.rtx_time && config_.rtp.nack.rtp_history_ms != 0) {
config_.rtp.nack.rtp_history_ms = *codec.rtx_time;
}
config_.rtp.rtcp_xr.receiver_reference_time_report = HasRrtr(codec.codec);
if (codec.ulpfec.red_rtx_payload_type != -1) {
config_.rtp
.rtx_associated_payload_types[codec.ulpfec.red_rtx_payload_type] =
codec.ulpfec.red_payload_type;
}
config_.renderer = this;
flexfec_config_.payload_type = flexfec_config.payload_type;
CreateReceiveStream();
}
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
~WebRtcVideoReceiveStream() {
call_->DestroyVideoReceiveStream(stream_);
if (flexfec_stream_)
call_->DestroyFlexfecReceiveStream(flexfec_stream_);
}
webrtc::VideoReceiveStreamInterface&
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::stream() {
RTC_DCHECK(stream_);
return *stream_;
}
webrtc::FlexfecReceiveStream*
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::flexfec_stream() {
return flexfec_stream_;
}
const std::vector<uint32_t>&
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::GetSsrcs() const {
return stream_params_.ssrcs;
}
std::vector<webrtc::RtpSource>
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::GetSources() {
RTC_DCHECK(stream_);
return stream_->GetSources();
}
webrtc::RtpParameters
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::GetRtpParameters() const {
webrtc::RtpParameters rtp_parameters;
std::vector<uint32_t> primary_ssrcs;
stream_params_.GetPrimarySsrcs(&primary_ssrcs);
for (uint32_t ssrc : primary_ssrcs) {
rtp_parameters.encodings.emplace_back();
rtp_parameters.encodings.back().ssrc = ssrc;
}
rtp_parameters.rtcp.reduced_size =
config_.rtp.rtcp_mode == webrtc::RtcpMode::kReducedSize;
return rtp_parameters;
}
bool WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::ReconfigureCodecs(
const std::vector<VideoCodecSettings>& recv_codecs) {
RTC_DCHECK(stream_);
RTC_DCHECK(!recv_codecs.empty());
std::map<int, int> rtx_associated_payload_types;
std::set<int> raw_payload_types;
std::vector<webrtc::VideoReceiveStreamInterface::Decoder> decoders;
ExtractCodecInformation(recv_codecs, rtx_associated_payload_types,
raw_payload_types, decoders);
const auto& codec = recv_codecs.front();
if (config_.rtp.red_payload_type != codec.ulpfec.red_payload_type ||
config_.rtp.ulpfec_payload_type != codec.ulpfec.ulpfec_payload_type) {
config_.rtp.ulpfec_payload_type = codec.ulpfec.ulpfec_payload_type;
config_.rtp.red_payload_type = codec.ulpfec.red_payload_type;
stream_->SetProtectionPayloadTypes(config_.rtp.red_payload_type,
config_.rtp.ulpfec_payload_type);
}
const bool has_lntf = HasLntf(codec.codec);
if (config_.rtp.lntf.enabled != has_lntf) {
config_.rtp.lntf.enabled = has_lntf;
stream_->SetLossNotificationEnabled(has_lntf);
}
int new_history_ms = config_.rtp.nack.rtp_history_ms;
const int rtp_history_ms = HasNack(codec.codec) ? kNackHistoryMs : 0;
if (rtp_history_ms != config_.rtp.nack.rtp_history_ms) {
new_history_ms = rtp_history_ms;
}
// The rtx-time parameter can be used to override the hardcoded default for
// the NACK buffer length.
if (codec.rtx_time && new_history_ms != 0) {
new_history_ms = *codec.rtx_time;
}
if (config_.rtp.nack.rtp_history_ms != new_history_ms) {
config_.rtp.nack.rtp_history_ms = new_history_ms;
stream_->SetNackHistory(webrtc::TimeDelta::Millis(new_history_ms));
}
const bool has_rtr = HasRrtr(codec.codec);
if (has_rtr != config_.rtp.rtcp_xr.receiver_reference_time_report) {
config_.rtp.rtcp_xr.receiver_reference_time_report = has_rtr;
stream_->SetRtcpXr(config_.rtp.rtcp_xr);
}
if (codec.ulpfec.red_rtx_payload_type != -1) {
rtx_associated_payload_types[codec.ulpfec.red_rtx_payload_type] =
codec.ulpfec.red_payload_type;
}
if (config_.rtp.rtx_associated_payload_types !=
rtx_associated_payload_types) {
stream_->SetAssociatedPayloadTypes(rtx_associated_payload_types);
rtx_associated_payload_types.swap(config_.rtp.rtx_associated_payload_types);
}
bool recreate_needed = false;
if (raw_payload_types != config_.rtp.raw_payload_types) {
raw_payload_types.swap(config_.rtp.raw_payload_types);
recreate_needed = true;
}
if (decoders != config_.decoders) {
decoders.swap(config_.decoders);
recreate_needed = true;
}
return recreate_needed;
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::SetFeedbackParameters(
bool lntf_enabled,
bool nack_enabled,
webrtc::RtcpMode rtcp_mode,
std::optional<int> rtx_time) {
RTC_DCHECK(stream_);
if (config_.rtp.rtcp_mode != rtcp_mode) {
config_.rtp.rtcp_mode = rtcp_mode;
stream_->SetRtcpMode(rtcp_mode);
flexfec_config_.rtcp_mode = rtcp_mode;
if (flexfec_stream_) {
flexfec_stream_->SetRtcpMode(rtcp_mode);
}
}
config_.rtp.lntf.enabled = lntf_enabled;
stream_->SetLossNotificationEnabled(lntf_enabled);
int nack_history_ms = nack_enabled ? rtx_time.value_or(kNackHistoryMs) : 0;
config_.rtp.nack.rtp_history_ms = nack_history_ms;
stream_->SetNackHistory(webrtc::TimeDelta::Millis(nack_history_ms));
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::SetFlexFecPayload(
int payload_type) {
// TODO(bugs.webrtc.org/11993, tommi): See if it is better to always have a
// flexfec stream object around and instead of recreating the video stream,
// reconfigure the flexfec object from within the rtp callback (soon to be on
// the network thread).
if (flexfec_stream_) {
if (flexfec_stream_->payload_type() == payload_type) {
RTC_DCHECK_EQ(flexfec_config_.payload_type, payload_type);
return;
}
flexfec_config_.payload_type = payload_type;
flexfec_stream_->SetPayloadType(payload_type);
if (payload_type == -1) {
stream_->SetFlexFecProtection(nullptr);
call_->DestroyFlexfecReceiveStream(flexfec_stream_);
flexfec_stream_ = nullptr;
}
} else if (payload_type != -1) {
flexfec_config_.payload_type = payload_type;
if (flexfec_config_.IsCompleteAndEnabled()) {
flexfec_stream_ = call_->CreateFlexfecReceiveStream(flexfec_config_);
stream_->SetFlexFecProtection(flexfec_stream_);
}
} else {
// Noop. No flexfec stream exists and "new" payload_type == -1.
RTC_DCHECK(!flexfec_config_.IsCompleteAndEnabled());
flexfec_config_.payload_type = payload_type;
}
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::SetReceiverParameters(
const ChangedReceiverParameters& params) {
RTC_DCHECK(stream_);
bool video_needs_recreation = false;
if (params.codec_settings) {
video_needs_recreation = ReconfigureCodecs(*params.codec_settings);
}
if (params.flexfec_payload_type)
SetFlexFecPayload(*params.flexfec_payload_type);
if (video_needs_recreation) {
RecreateReceiveStream();
} else {
RTC_DLOG_F(LS_INFO) << "No receive stream recreate needed.";
}
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
RecreateReceiveStream() {
RTC_DCHECK_RUN_ON(&thread_checker_);
RTC_DCHECK(stream_);
std::optional<int> base_minimum_playout_delay_ms;
std::optional<webrtc::VideoReceiveStreamInterface::RecordingState>
recording_state;
if (stream_) {
base_minimum_playout_delay_ms = stream_->GetBaseMinimumPlayoutDelayMs();
recording_state = stream_->SetAndGetRecordingState(
webrtc::VideoReceiveStreamInterface::RecordingState(),
/*generate_key_frame=*/false);
call_->DestroyVideoReceiveStream(stream_);
stream_ = nullptr;
}
if (flexfec_stream_) {
call_->DestroyFlexfecReceiveStream(flexfec_stream_);
flexfec_stream_ = nullptr;
}
CreateReceiveStream();
if (base_minimum_playout_delay_ms) {
stream_->SetBaseMinimumPlayoutDelayMs(
base_minimum_playout_delay_ms.value());
}
if (recording_state) {
stream_->SetAndGetRecordingState(std::move(*recording_state),
/*generate_key_frame=*/false);
}
if (receiving_) {
StartReceiveStream();
}
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
CreateReceiveStream() {
RTC_DCHECK(!stream_);
RTC_DCHECK(!flexfec_stream_);
if (flexfec_config_.IsCompleteAndEnabled()) {
flexfec_stream_ = call_->CreateFlexfecReceiveStream(flexfec_config_);
}
webrtc::VideoReceiveStreamInterface::Config config = config_.Copy();
config.rtp.protected_by_flexfec = (flexfec_stream_ != nullptr);
config.rtp.packet_sink_ = flexfec_stream_;
stream_ = call_->CreateVideoReceiveStream(std::move(config));
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::StartReceiveStream() {
RTC_DCHECK_RUN_ON(&thread_checker_);
receiving_ = true;
stream_->Start();
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::StopReceiveStream() {
RTC_DCHECK_RUN_ON(&thread_checker_);
receiving_ = false;
stream_->Stop();
RecreateReceiveStream();
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::OnFrame(
const webrtc::VideoFrame& frame) {
webrtc::MutexLock lock(&sink_lock_);
int64_t time_now_ms = rtc::TimeMillis();
if (first_frame_timestamp_ < 0)
first_frame_timestamp_ = time_now_ms;
int64_t elapsed_time_ms = time_now_ms - first_frame_timestamp_;
if (frame.ntp_time_ms() > 0)
estimated_remote_start_ntp_time_ms_ = frame.ntp_time_ms() - elapsed_time_ms;
if (sink_ == NULL) {
RTC_LOG(LS_WARNING)
<< "VideoReceiveStreamInterface not connected to a VideoSink.";
return;
}
sink_->OnFrame(frame);
}
bool WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::IsDefaultStream()
const {
return default_stream_;
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::SetFrameDecryptor(
rtc::scoped_refptr<webrtc::FrameDecryptorInterface> frame_decryptor) {
config_.frame_decryptor = frame_decryptor;
if (stream_) {
RTC_LOG(LS_INFO)
<< "Setting FrameDecryptor (recv) because of SetFrameDecryptor, "
"remote_ssrc="
<< config_.rtp.remote_ssrc;
stream_->SetFrameDecryptor(frame_decryptor);
}
}
bool WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
SetBaseMinimumPlayoutDelayMs(int delay_ms) {
return stream_ ? stream_->SetBaseMinimumPlayoutDelayMs(delay_ms) : false;
}
int WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
GetBaseMinimumPlayoutDelayMs() const {
return stream_ ? stream_->GetBaseMinimumPlayoutDelayMs() : 0;
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::SetSink(
rtc::VideoSinkInterface<webrtc::VideoFrame>* sink) {
webrtc::MutexLock lock(&sink_lock_);
sink_ = sink;
}
VideoReceiverInfo
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::GetVideoReceiverInfo(
bool log_stats) {
VideoReceiverInfo info;
info.ssrc_groups = stream_params_.ssrc_groups;
info.add_ssrc(config_.rtp.remote_ssrc);
webrtc::VideoReceiveStreamInterface::Stats stats = stream_->GetStats();
info.decoder_implementation_name = stats.decoder_implementation_name;
info.power_efficient_decoder = stats.power_efficient_decoder;
if (stats.current_payload_type != -1) {
info.codec_payload_type = stats.current_payload_type;
auto decoder_it = absl::c_find_if(config_.decoders, [&](const auto& d) {
return d.payload_type == stats.current_payload_type;
});
if (decoder_it != config_.decoders.end())
info.codec_name = decoder_it->video_format.name;
}
info.payload_bytes_received = stats.rtp_stats.packet_counter.payload_bytes;
info.header_and_padding_bytes_received =
stats.rtp_stats.packet_counter.header_bytes +
stats.rtp_stats.packet_counter.padding_bytes;
info.packets_received = stats.rtp_stats.packet_counter.packets;
info.packets_lost = stats.rtp_stats.packets_lost;
info.jitter_ms = stats.rtp_stats.jitter / (kVideoCodecClockrate / 1000);
info.framerate_received = stats.network_frame_rate;
info.framerate_decoded = stats.decode_frame_rate;
info.framerate_output = stats.render_frame_rate;
info.frame_width = stats.width;
info.frame_height = stats.height;
{
webrtc::MutexLock frame_cs(&sink_lock_);
info.capture_start_ntp_time_ms = estimated_remote_start_ntp_time_ms_;
}
info.decode_ms = stats.decode_ms;
info.max_decode_ms = stats.max_decode_ms;
info.current_delay_ms = stats.current_delay_ms;
info.target_delay_ms = stats.target_delay_ms;
info.jitter_buffer_ms = stats.jitter_buffer_ms;
info.jitter_buffer_delay_seconds =
stats.jitter_buffer_delay.seconds<double>();
info.jitter_buffer_target_delay_seconds =
stats.jitter_buffer_target_delay.seconds<double>();
info.jitter_buffer_emitted_count = stats.jitter_buffer_emitted_count;
info.jitter_buffer_minimum_delay_seconds =
stats.jitter_buffer_minimum_delay.seconds<double>();
info.min_playout_delay_ms = stats.min_playout_delay_ms;
info.render_delay_ms = stats.render_delay_ms;
info.frames_received =
stats.frame_counts.key_frames + stats.frame_counts.delta_frames;
info.frames_dropped = stats.frames_dropped;
info.frames_decoded = stats.frames_decoded;
info.key_frames_decoded = stats.frame_counts.key_frames;
info.frames_rendered = stats.frames_rendered;
info.qp_sum = stats.qp_sum;
info.corruption_score_sum = stats.corruption_score_sum;
info.corruption_score_squared_sum = stats.corruption_score_squared_sum;
info.corruption_score_count = stats.corruption_score_count;
info.total_decode_time = stats.total_decode_time;
info.total_processing_delay = stats.total_processing_delay;
info.total_assembly_time = stats.total_assembly_time;
info.frames_assembled_from_multiple_packets =
stats.frames_assembled_from_multiple_packets;
info.last_packet_received = stats.rtp_stats.last_packet_received;
info.estimated_playout_ntp_timestamp_ms =
stats.estimated_playout_ntp_timestamp_ms;
info.first_frame_received_to_decoded_ms =
stats.first_frame_received_to_decoded_ms;
info.total_inter_frame_delay = stats.total_inter_frame_delay;
info.total_squared_inter_frame_delay = stats.total_squared_inter_frame_delay;
info.interframe_delay_max_ms = stats.interframe_delay_max_ms;
info.freeze_count = stats.freeze_count;
info.pause_count = stats.pause_count;
info.total_freezes_duration_ms = stats.total_freezes_duration_ms;
info.total_pauses_duration_ms = stats.total_pauses_duration_ms;
info.content_type = stats.content_type;
info.firs_sent = stats.rtcp_packet_type_counts.fir_packets;
info.plis_sent = stats.rtcp_packet_type_counts.pli_packets;
info.nacks_sent = stats.rtcp_packet_type_counts.nack_packets;
// TODO(bugs.webrtc.org/10662): Add stats for LNTF.
info.timing_frame_info = stats.timing_frame_info;
if (stats.rtx_rtp_stats.has_value()) {
info.retransmitted_packets_received =
stats.rtx_rtp_stats->packet_counter.packets;
info.retransmitted_bytes_received =
stats.rtx_rtp_stats->packet_counter.payload_bytes;
// RTX information gets added to primary counters.
info.payload_bytes_received +=
stats.rtx_rtp_stats->packet_counter.payload_bytes;
info.header_and_padding_bytes_received +=
stats.rtx_rtp_stats->packet_counter.header_bytes +
stats.rtx_rtp_stats->packet_counter.padding_bytes;
info.packets_received += stats.rtx_rtp_stats->packet_counter.packets;
}
if (flexfec_stream_) {
const webrtc::ReceiveStatistics* fec_stats = flexfec_stream_->GetStats();
if (fec_stats) {
const webrtc::StreamStatistician* statistican =
fec_stats->GetStatistician(flexfec_config_.rtp.remote_ssrc);
if (statistican) {
const webrtc::RtpReceiveStats fec_rtp_stats = statistican->GetStats();
info.fec_packets_received = fec_rtp_stats.packet_counter.packets;
// TODO(bugs.webrtc.org/15250): implement fecPacketsDiscarded.
info.fec_bytes_received = fec_rtp_stats.packet_counter.payload_bytes;
// FEC information gets added to primary counters.
info.payload_bytes_received +=
fec_rtp_stats.packet_counter.payload_bytes;
info.header_and_padding_bytes_received +=
fec_rtp_stats.packet_counter.header_bytes +
fec_rtp_stats.packet_counter.padding_bytes;
info.packets_received += fec_rtp_stats.packet_counter.packets;
} else {
info.fec_packets_received = 0;
}
}
}
// remote-outbound-rtp stats.
info.last_sender_report_timestamp = stats.last_sender_report_timestamp;
info.last_sender_report_utc_timestamp =
stats.last_sender_report_utc_timestamp;
info.last_sender_report_remote_utc_timestamp =
stats.last_sender_report_remote_utc_timestamp;
info.sender_reports_packets_sent = stats.sender_reports_packets_sent;
info.sender_reports_bytes_sent = stats.sender_reports_bytes_sent;
info.sender_reports_reports_count = stats.sender_reports_reports_count;
// TODO(bugs.webrtc.org/12529): RTT-related fields are missing and can only be
// present if DLRR is enabled.
if (log_stats)
RTC_LOG(LS_INFO) << stats.ToString(rtc::TimeMillis());
return info;
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
SetRecordableEncodedFrameCallback(
std::function<void(const webrtc::RecordableEncodedFrame&)> callback) {
if (stream_) {
stream_->SetAndGetRecordingState(
webrtc::VideoReceiveStreamInterface::RecordingState(
std::move(callback)),
/*generate_key_frame=*/true);
} else {
RTC_LOG(LS_ERROR) << "Absent receive stream; ignoring setting encoded "
"frame sink";
}
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
ClearRecordableEncodedFrameCallback() {
if (stream_) {
stream_->SetAndGetRecordingState(
webrtc::VideoReceiveStreamInterface::RecordingState(),
/*generate_key_frame=*/false);
} else {
RTC_LOG(LS_ERROR) << "Absent receive stream; ignoring clearing encoded "
"frame sink";
}
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::GenerateKeyFrame() {
if (stream_) {
stream_->GenerateKeyFrame();
} else {
RTC_LOG(LS_ERROR)
<< "Absent receive stream; ignoring key frame generation request.";
}
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::
SetDepacketizerToDecoderFrameTransformer(
rtc::scoped_refptr<webrtc::FrameTransformerInterface>
frame_transformer) {
config_.frame_transformer = frame_transformer;
if (stream_)
stream_->SetDepacketizerToDecoderFrameTransformer(frame_transformer);
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::SetLocalSsrc(
uint32_t ssrc) {
config_.rtp.local_ssrc = ssrc;
call_->OnLocalSsrcUpdated(stream(), ssrc);
if (flexfec_stream_)
call_->OnLocalSsrcUpdated(*flexfec_stream_, ssrc);
}
void WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream::UpdateRtxSsrc(
uint32_t ssrc) {
stream_->UpdateRtxSsrc(ssrc);
}
WebRtcVideoReceiveChannel::WebRtcVideoReceiveStream*
WebRtcVideoReceiveChannel::FindReceiveStream(uint32_t ssrc) {
if (ssrc == 0) {
std::optional<uint32_t> default_ssrc = GetUnsignaledSsrc();
if (!default_ssrc) {
return nullptr;
}
ssrc = *default_ssrc;
}
auto it = receive_streams_.find(ssrc);
if (it != receive_streams_.end()) {
return it->second;
}
return nullptr;
}
// RTC_RUN_ON(worker_thread_)
void WebRtcVideoReceiveChannel::ProcessReceivedPacket(
webrtc::RtpPacketReceived packet) {
// TODO(bugs.webrtc.org/11993): This code is very similar to what
// WebRtcVoiceMediaChannel::OnPacketReceived does. For maintainability and
// consistency it would be good to move the interaction with call_->Receiver()
// to a common implementation and provide a callback on the worker thread
// for the exception case (DELIVERY_UNKNOWN_SSRC) and how retry is attempted.
// TODO(bugs.webrtc.org/7135): extensions in `packet` is currently set
// in RtpTransport and does not neccessarily include extensions specific
// to this channel/MID. Also see comment in
// BaseChannel::MaybeUpdateDemuxerAndRtpExtensions_w.
// It would likely be good if extensions where merged per BUNDLE and
// applied directly in RtpTransport::DemuxPacket;
packet.IdentifyExtensions(recv_rtp_extension_map_);
packet.set_payload_type_frequency(webrtc::kVideoPayloadTypeFrequency);
if (!packet.arrival_time().IsFinite()) {
packet.set_arrival_time(webrtc::Timestamp::Micros(rtc::TimeMicros()));
}
call_->Receiver()->DeliverRtpPacket(
webrtc::MediaType::VIDEO, std::move(packet),
absl::bind_front(
&WebRtcVideoReceiveChannel::MaybeCreateDefaultReceiveStream, this));
}
void WebRtcVideoReceiveChannel::SetRecordableEncodedFrameCallback(
uint32_t ssrc,
std::function<void(const webrtc::RecordableEncodedFrame&)> callback) {
RTC_DCHECK_RUN_ON(&thread_checker_);
WebRtcVideoReceiveStream* stream = FindReceiveStream(ssrc);
if (stream) {
stream->SetRecordableEncodedFrameCallback(std::move(callback));
} else {
RTC_LOG(LS_ERROR) << "Absent receive stream; ignoring setting encoded "
"frame sink for ssrc "
<< ssrc;
}
}
void WebRtcVideoReceiveChannel::ClearRecordableEncodedFrameCallback(
uint32_t ssrc) {
RTC_DCHECK_RUN_ON(&thread_checker_);
WebRtcVideoReceiveStream* stream = FindReceiveStream(ssrc);
if (stream) {
stream->ClearRecordableEncodedFrameCallback();
} else {
RTC_LOG(LS_ERROR) << "Absent receive stream; ignoring clearing encoded "
"frame sink for ssrc "
<< ssrc;
}
}
void WebRtcVideoReceiveChannel::RequestRecvKeyFrame(uint32_t ssrc) {
RTC_DCHECK_RUN_ON(&thread_checker_);
WebRtcVideoReceiveStream* stream = FindReceiveStream(ssrc);
if (stream) {
return stream->GenerateKeyFrame();
} else {
RTC_LOG(LS_ERROR)
<< "Absent receive stream; ignoring key frame generation for ssrc "
<< ssrc;
}
}
void WebRtcVideoReceiveChannel::SetDepacketizerToDecoderFrameTransformer(
uint32_t ssrc,
rtc::scoped_refptr<webrtc::FrameTransformerInterface> frame_transformer) {
RTC_DCHECK(frame_transformer);
RTC_DCHECK_RUN_ON(&thread_checker_);
if (ssrc == 0) {
// If the receiver is unsignaled, save the frame transformer and set it
// when the stream is associated with an ssrc.
unsignaled_frame_transformer_ = std::move(frame_transformer);
return;
}
auto matching_stream = receive_streams_.find(ssrc);
if (matching_stream != receive_streams_.end()) {
matching_stream->second->SetDepacketizerToDecoderFrameTransformer(
std::move(frame_transformer));
}
}
// ------------------------- VideoCodecSettings --------------------
VideoCodecSettings::VideoCodecSettings(const Codec& codec)
: codec(codec), flexfec_payload_type(-1), rtx_payload_type(-1) {}
bool VideoCodecSettings::operator==(const VideoCodecSettings& other) const {
return codec == other.codec && ulpfec == other.ulpfec &&
flexfec_payload_type == other.flexfec_payload_type &&
rtx_payload_type == other.rtx_payload_type &&
rtx_time == other.rtx_time;
}
bool VideoCodecSettings::EqualsDisregardingFlexfec(
const VideoCodecSettings& a,
const VideoCodecSettings& b) {
return a.codec == b.codec && a.ulpfec == b.ulpfec &&
a.rtx_payload_type == b.rtx_payload_type && a.rtx_time == b.rtx_time;
}
bool VideoCodecSettings::operator!=(const VideoCodecSettings& other) const {
return !(*this == other);
}
} // namespace cricket