blob: a116184f0c167369c173e6097d59a64907a74a93 [file] [log] [blame]
/*
* Copyright (c) 2004 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/base/codec.h"
#include "absl/algorithm/container.h"
#include "absl/strings/match.h"
#include "api/video_codecs/h264_profile_level_id.h"
#include "api/video_codecs/vp9_profile.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/string_encode.h"
#include "rtc_base/strings/string_builder.h"
#include "system_wrappers/include/field_trial.h"
namespace cricket {
namespace {
std::string GetH264PacketizationModeOrDefault(const CodecParameterMap& params) {
auto it = params.find(kH264FmtpPacketizationMode);
if (it != params.end()) {
return it->second;
}
// If packetization-mode is not present, default to "0".
// https://tools.ietf.org/html/rfc6184#section-6.2
return "0";
}
bool IsSameH264PacketizationMode(const CodecParameterMap& left,
const CodecParameterMap& right) {
return GetH264PacketizationModeOrDefault(left) ==
GetH264PacketizationModeOrDefault(right);
}
// Some (video) codecs are actually families of codecs and rely on parameters
// to distinguish different incompatible family members.
bool IsSameCodecSpecific(const std::string& name1,
const CodecParameterMap& params1,
const std::string& name2,
const CodecParameterMap& params2) {
// The names might not necessarily match, so check both.
auto either_name_matches = [&](const std::string name) {
return absl::EqualsIgnoreCase(name, name1) ||
absl::EqualsIgnoreCase(name, name2);
};
if (either_name_matches(kH264CodecName))
return webrtc::H264IsSameProfile(params1, params2) &&
IsSameH264PacketizationMode(params1, params2);
if (either_name_matches(kVp9CodecName))
return webrtc::VP9IsSameProfile(params1, params2);
return true;
}
} // namespace
FeedbackParams::FeedbackParams() = default;
FeedbackParams::~FeedbackParams() = default;
bool FeedbackParam::operator==(const FeedbackParam& other) const {
return absl::EqualsIgnoreCase(other.id(), id()) &&
absl::EqualsIgnoreCase(other.param(), param());
}
bool FeedbackParams::operator==(const FeedbackParams& other) const {
return params_ == other.params_;
}
bool FeedbackParams::Has(const FeedbackParam& param) const {
return absl::c_linear_search(params_, param);
}
void FeedbackParams::Add(const FeedbackParam& param) {
if (param.id().empty()) {
return;
}
if (Has(param)) {
// Param already in `this`.
return;
}
params_.push_back(param);
RTC_CHECK(!HasDuplicateEntries());
}
void FeedbackParams::Intersect(const FeedbackParams& from) {
std::vector<FeedbackParam>::iterator iter_to = params_.begin();
while (iter_to != params_.end()) {
if (!from.Has(*iter_to)) {
iter_to = params_.erase(iter_to);
} else {
++iter_to;
}
}
}
bool FeedbackParams::HasDuplicateEntries() const {
for (std::vector<FeedbackParam>::const_iterator iter = params_.begin();
iter != params_.end(); ++iter) {
for (std::vector<FeedbackParam>::const_iterator found = iter + 1;
found != params_.end(); ++found) {
if (*found == *iter) {
return true;
}
}
}
return false;
}
Codec::Codec(int id, const std::string& name, int clockrate)
: id(id), name(name), clockrate(clockrate) {}
Codec::Codec() : id(0), clockrate(0) {}
Codec::Codec(const Codec& c) = default;
Codec::Codec(Codec&& c) = default;
Codec::~Codec() = default;
Codec& Codec::operator=(const Codec& c) = default;
Codec& Codec::operator=(Codec&& c) = default;
bool Codec::operator==(const Codec& c) const {
return this->id == c.id && // id is reserved in objective-c
name == c.name && clockrate == c.clockrate && params == c.params &&
feedback_params == c.feedback_params;
}
bool Codec::Matches(const Codec& codec) const {
// Match the codec id/name based on the typical static/dynamic name rules.
// Matching is case-insensitive.
// Legacy behaviour with killswitch.
if (webrtc::field_trial::IsDisabled(
"WebRTC-PayloadTypes-Lower-Dynamic-Range")) {
const int kMaxStaticPayloadId = 95;
return (id <= kMaxStaticPayloadId || codec.id <= kMaxStaticPayloadId)
? (id == codec.id)
: (absl::EqualsIgnoreCase(name, codec.name));
}
// We support the ranges [96, 127] and more recently [35, 65].
// https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml#rtp-parameters-1
// Within those ranges we match by codec name, outside by codec id.
const int kLowerDynamicRangeMin = 35;
const int kLowerDynamicRangeMax = 65;
const int kUpperDynamicRangeMin = 96;
const int kUpperDynamicRangeMax = 127;
const bool is_id_in_dynamic_range =
(id >= kLowerDynamicRangeMin && id <= kLowerDynamicRangeMax) ||
(id >= kUpperDynamicRangeMin && id <= kUpperDynamicRangeMax);
const bool is_codec_id_in_dynamic_range =
(codec.id >= kLowerDynamicRangeMin &&
codec.id <= kLowerDynamicRangeMax) ||
(codec.id >= kUpperDynamicRangeMin && codec.id <= kUpperDynamicRangeMax);
return is_id_in_dynamic_range && is_codec_id_in_dynamic_range
? (absl::EqualsIgnoreCase(name, codec.name))
: (id == codec.id);
}
bool Codec::MatchesCapability(
const webrtc::RtpCodecCapability& codec_capability) const {
webrtc::RtpCodecParameters codec_parameters = ToCodecParameters();
return codec_parameters.name == codec_capability.name &&
codec_parameters.kind == codec_capability.kind &&
(codec_parameters.name == cricket::kRtxCodecName ||
(codec_parameters.num_channels == codec_capability.num_channels &&
codec_parameters.clock_rate == codec_capability.clock_rate &&
codec_parameters.parameters == codec_capability.parameters));
}
bool Codec::GetParam(const std::string& name, std::string* out) const {
CodecParameterMap::const_iterator iter = params.find(name);
if (iter == params.end())
return false;
*out = iter->second;
return true;
}
bool Codec::GetParam(const std::string& name, int* out) const {
CodecParameterMap::const_iterator iter = params.find(name);
if (iter == params.end())
return false;
return rtc::FromString(iter->second, out);
}
void Codec::SetParam(const std::string& name, const std::string& value) {
params[name] = value;
}
void Codec::SetParam(const std::string& name, int value) {
params[name] = rtc::ToString(value);
}
bool Codec::RemoveParam(const std::string& name) {
return params.erase(name) == 1;
}
void Codec::AddFeedbackParam(const FeedbackParam& param) {
feedback_params.Add(param);
}
bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
return feedback_params.Has(param);
}
void Codec::IntersectFeedbackParams(const Codec& other) {
feedback_params.Intersect(other.feedback_params);
}
webrtc::RtpCodecParameters Codec::ToCodecParameters() const {
webrtc::RtpCodecParameters codec_params;
codec_params.payload_type = id;
codec_params.name = name;
codec_params.clock_rate = clockrate;
codec_params.parameters.insert(params.begin(), params.end());
return codec_params;
}
AudioCodec::AudioCodec(int id,
const std::string& name,
int clockrate,
int bitrate,
size_t channels)
: Codec(id, name, clockrate), bitrate(bitrate), channels(channels) {}
AudioCodec::AudioCodec() : Codec(), bitrate(0), channels(0) {}
AudioCodec::AudioCodec(const AudioCodec& c) = default;
AudioCodec::AudioCodec(AudioCodec&& c) = default;
AudioCodec& AudioCodec::operator=(const AudioCodec& c) = default;
AudioCodec& AudioCodec::operator=(AudioCodec&& c) = default;
bool AudioCodec::operator==(const AudioCodec& c) const {
return bitrate == c.bitrate && channels == c.channels && Codec::operator==(c);
}
bool AudioCodec::Matches(const AudioCodec& codec) const {
// If a nonzero clockrate is specified, it must match the actual clockrate.
// If a nonzero bitrate is specified, it must match the actual bitrate,
// unless the codec is VBR (0), where we just force the supplied value.
// The number of channels must match exactly, with the exception
// that channels=0 is treated synonymously as channels=1, per RFC
// 4566 section 6: " [The channels] parameter is OPTIONAL and may be
// omitted if the number of channels is one."
// Preference is ignored.
// TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate.
return Codec::Matches(codec) &&
((codec.clockrate == 0 /*&& clockrate == 8000*/) ||
clockrate == codec.clockrate) &&
(codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) &&
((codec.channels < 2 && channels < 2) || channels == codec.channels);
}
std::string AudioCodec::ToString() const {
char buf[256];
rtc::SimpleStringBuilder sb(buf);
sb << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
<< ":" << channels << "]";
return sb.str();
}
webrtc::RtpCodecParameters AudioCodec::ToCodecParameters() const {
webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
codec_params.num_channels = static_cast<int>(channels);
codec_params.kind = MEDIA_TYPE_AUDIO;
return codec_params;
}
std::string VideoCodec::ToString() const {
char buf[256];
rtc::SimpleStringBuilder sb(buf);
sb << "VideoCodec[" << id << ":" << name;
if (packetization.has_value()) {
sb << ":" << *packetization;
}
sb << "]";
return sb.str();
}
webrtc::RtpCodecParameters VideoCodec::ToCodecParameters() const {
webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
codec_params.kind = MEDIA_TYPE_VIDEO;
return codec_params;
}
VideoCodec::VideoCodec(int id, const std::string& name)
: Codec(id, name, kVideoCodecClockrate) {
SetDefaultParameters();
}
VideoCodec::VideoCodec(const std::string& name) : VideoCodec(0 /* id */, name) {
SetDefaultParameters();
}
VideoCodec::VideoCodec() : Codec() {
clockrate = kVideoCodecClockrate;
}
VideoCodec::VideoCodec(const webrtc::SdpVideoFormat& c)
: Codec(0 /* id */, c.name, kVideoCodecClockrate) {
params = c.parameters;
}
VideoCodec::VideoCodec(const VideoCodec& c) = default;
VideoCodec::VideoCodec(VideoCodec&& c) = default;
VideoCodec& VideoCodec::operator=(const VideoCodec& c) = default;
VideoCodec& VideoCodec::operator=(VideoCodec&& c) = default;
void VideoCodec::SetDefaultParameters() {
if (absl::EqualsIgnoreCase(kH264CodecName, name)) {
// This default is set for all H.264 codecs created because
// that was the default before packetization mode support was added.
// TODO(hta): Move this to the places that create VideoCodecs from
// SDP or from knowledge of implementation capabilities.
SetParam(kH264FmtpPacketizationMode, "1");
}
}
bool VideoCodec::operator==(const VideoCodec& c) const {
return Codec::operator==(c) && packetization == c.packetization;
}
bool VideoCodec::Matches(const VideoCodec& other) const {
return Codec::Matches(other) &&
IsSameCodecSpecific(name, params, other.name, other.params);
}
absl::optional<std::string> VideoCodec::IntersectPacketization(
const VideoCodec& local_codec,
const VideoCodec& remote_codec) {
if (local_codec.packetization == remote_codec.packetization) {
return local_codec.packetization;
}
return absl::nullopt;
}
VideoCodec VideoCodec::CreateRtxCodec(int rtx_payload_type,
int associated_payload_type) {
VideoCodec rtx_codec(rtx_payload_type, kRtxCodecName);
rtx_codec.SetParam(kCodecParamAssociatedPayloadType, associated_payload_type);
return rtx_codec;
}
VideoCodec::CodecType VideoCodec::GetCodecType() const {
if (absl::EqualsIgnoreCase(name, kRedCodecName)) {
return CODEC_RED;
}
if (absl::EqualsIgnoreCase(name, kUlpfecCodecName)) {
return CODEC_ULPFEC;
}
if (absl::EqualsIgnoreCase(name, kFlexfecCodecName)) {
return CODEC_FLEXFEC;
}
if (absl::EqualsIgnoreCase(name, kRtxCodecName)) {
return CODEC_RTX;
}
return CODEC_VIDEO;
}
bool VideoCodec::ValidateCodecFormat() const {
if (id < 0 || id > 127) {
RTC_LOG(LS_ERROR) << "Codec with invalid payload type: " << ToString();
return false;
}
if (GetCodecType() != CODEC_VIDEO) {
return true;
}
// Video validation from here on.
int min_bitrate = -1;
int max_bitrate = -1;
if (GetParam(kCodecParamMinBitrate, &min_bitrate) &&
GetParam(kCodecParamMaxBitrate, &max_bitrate)) {
if (max_bitrate < min_bitrate) {
RTC_LOG(LS_ERROR) << "Codec with max < min bitrate: " << ToString();
return false;
}
}
return true;
}
bool HasLntf(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamLntf, kParamValueEmpty));
}
bool HasNack(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
}
bool HasRemb(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
}
bool HasRrtr(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamRrtr, kParamValueEmpty));
}
bool HasTransportCc(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
}
const VideoCodec* FindMatchingCodec(
const std::vector<VideoCodec>& supported_codecs,
const VideoCodec& codec) {
for (const VideoCodec& supported_codec : supported_codecs) {
if (IsSameCodec(codec.name, codec.params, supported_codec.name,
supported_codec.params)) {
return &supported_codec;
}
}
return nullptr;
}
// TODO(crbug.com/1187565): Remove once downstream projects stopped using this
// method in favor of SdpVideoFormat::IsSameCodec().
bool IsSameCodec(const std::string& name1,
const CodecParameterMap& params1,
const std::string& name2,
const CodecParameterMap& params2) {
// Two codecs are considered the same if the name matches (case insensitive)
// and certain codec-specific parameters match.
return absl::EqualsIgnoreCase(name1, name2) &&
IsSameCodecSpecific(name1, params1, name2, params2);
}
// If a decoder supports any H264 profile, it is implicitly assumed to also
// support constrained base line even though it's not explicitly listed.
void AddH264ConstrainedBaselineProfileToSupportedFormats(
std::vector<webrtc::SdpVideoFormat>* supported_formats) {
std::vector<webrtc::SdpVideoFormat> cbr_supported_formats;
// For any H264 supported profile, add the corresponding constrained baseline
// profile.
for (auto it = supported_formats->cbegin(); it != supported_formats->cend();
++it) {
if (it->name == cricket::kH264CodecName) {
const absl::optional<webrtc::H264ProfileLevelId> profile_level_id =
webrtc::ParseSdpForH264ProfileLevelId(it->parameters);
if (profile_level_id &&
profile_level_id->profile !=
webrtc::H264Profile::kProfileConstrainedBaseline) {
webrtc::SdpVideoFormat cbp_format = *it;
webrtc::H264ProfileLevelId cbp_profile = *profile_level_id;
cbp_profile.profile = webrtc::H264Profile::kProfileConstrainedBaseline;
cbp_format.parameters[cricket::kH264FmtpProfileLevelId] =
*webrtc::H264ProfileLevelIdToString(cbp_profile);
cbr_supported_formats.push_back(cbp_format);
}
}
}
size_t original_size = supported_formats->size();
// ...if it's not already in the list.
std::copy_if(cbr_supported_formats.begin(), cbr_supported_formats.end(),
std::back_inserter(*supported_formats),
[supported_formats](const webrtc::SdpVideoFormat& format) {
return !format.IsCodecInList(*supported_formats);
});
if (supported_formats->size() > original_size) {
RTC_LOG(LS_WARNING) << "Explicitly added H264 constrained baseline to list "
"of supported formats.";
}
}
} // namespace cricket