blob: cf9e6e12526534cb97edd4514335a21d7d32fea7 [file] [log] [blame]
/*
* Copyright 2017 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 "pc/rtp_parameters_conversion.h"
#include <cstdint>
#include <set>
#include <string>
#include <unordered_map>
#include <utility>
#include "api/array_view.h"
#include "api/media_types.h"
#include "media/base/media_constants.h"
#include "media/base/rtp_utils.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
namespace webrtc {
RTCErrorOr<cricket::FeedbackParam> ToCricketFeedbackParam(
const RtcpFeedback& feedback) {
switch (feedback.type) {
case RtcpFeedbackType::CCM:
if (!feedback.message_type) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Missing message type in CCM RtcpFeedback.");
} else if (*feedback.message_type != RtcpFeedbackMessageType::FIR) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Invalid message type in CCM RtcpFeedback.");
}
return cricket::FeedbackParam(cricket::kRtcpFbParamCcm,
cricket::kRtcpFbCcmParamFir);
case RtcpFeedbackType::NACK:
if (!feedback.message_type) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Missing message type in NACK RtcpFeedback.");
}
switch (*feedback.message_type) {
case RtcpFeedbackMessageType::GENERIC_NACK:
return cricket::FeedbackParam(cricket::kRtcpFbParamNack);
case RtcpFeedbackMessageType::PLI:
return cricket::FeedbackParam(cricket::kRtcpFbParamNack,
cricket::kRtcpFbNackParamPli);
default:
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Invalid message type in NACK RtcpFeedback.");
}
case RtcpFeedbackType::REMB:
if (feedback.message_type) {
LOG_AND_RETURN_ERROR(
RTCErrorType::INVALID_PARAMETER,
"Didn't expect message type in REMB RtcpFeedback.");
}
return cricket::FeedbackParam(cricket::kRtcpFbParamRemb);
case RtcpFeedbackType::TRANSPORT_CC:
if (feedback.message_type) {
LOG_AND_RETURN_ERROR(
RTCErrorType::INVALID_PARAMETER,
"Didn't expect message type in transport-cc RtcpFeedback.");
}
return cricket::FeedbackParam(cricket::kRtcpFbParamTransportCc);
}
// Not reached; avoids compile warning.
FATAL();
}
template <typename C>
static RTCError ToCricketCodecTypeSpecific(const RtpCodecParameters& codec,
C* cricket_codec);
template <>
RTCError ToCricketCodecTypeSpecific<cricket::AudioCodec>(
const RtpCodecParameters& codec,
cricket::AudioCodec* cricket_codec) {
if (codec.kind != cricket::MEDIA_TYPE_AUDIO) {
LOG_AND_RETURN_ERROR(
RTCErrorType::INVALID_PARAMETER,
"Can't use video codec with audio sender or receiver.");
}
if (!codec.num_channels) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Missing number of channels for audio codec.");
}
if (*codec.num_channels <= 0) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE,
"Number of channels must be positive.");
}
cricket_codec->channels = *codec.num_channels;
if (!codec.clock_rate) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Missing codec clock rate.");
}
if (*codec.clock_rate <= 0) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE,
"Clock rate must be positive.");
}
cricket_codec->clockrate = *codec.clock_rate;
return RTCError::OK();
}
// Video codecs don't use num_channels or clock_rate, but they should at least
// be validated to ensure the application isn't trying to do something it
// doesn't intend to.
template <>
RTCError ToCricketCodecTypeSpecific<cricket::VideoCodec>(
const RtpCodecParameters& codec,
cricket::VideoCodec*) {
if (codec.kind != cricket::MEDIA_TYPE_VIDEO) {
LOG_AND_RETURN_ERROR(
RTCErrorType::INVALID_PARAMETER,
"Can't use audio codec with video sender or receiver.");
}
if (codec.num_channels) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Video codec shouldn't have num_channels.");
}
if (!codec.clock_rate) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Missing codec clock rate.");
}
if (*codec.clock_rate != cricket::kVideoCodecClockrate) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Video clock rate must be 90000.");
}
return RTCError::OK();
}
template <typename C>
RTCErrorOr<C> ToCricketCodec(const RtpCodecParameters& codec) {
C cricket_codec;
// Start with audio/video specific conversion.
RTCError err = ToCricketCodecTypeSpecific(codec, &cricket_codec);
if (!err.ok()) {
return std::move(err);
}
cricket_codec.name = codec.name;
if (!cricket::IsValidRtpPayloadType(codec.payload_type)) {
char buf[40];
rtc::SimpleStringBuilder sb(buf);
sb << "Invalid payload type: " << codec.payload_type;
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE, sb.str());
}
cricket_codec.id = codec.payload_type;
for (const RtcpFeedback& feedback : codec.rtcp_feedback) {
auto result = ToCricketFeedbackParam(feedback);
if (!result.ok()) {
return result.MoveError();
}
cricket_codec.AddFeedbackParam(result.MoveValue());
}
cricket_codec.params.insert(codec.parameters.begin(), codec.parameters.end());
return std::move(cricket_codec);
}
template RTCErrorOr<cricket::AudioCodec> ToCricketCodec(
const RtpCodecParameters& codec);
template RTCErrorOr<cricket::VideoCodec> ToCricketCodec(
const RtpCodecParameters& codec);
template <typename C>
RTCErrorOr<std::vector<C>> ToCricketCodecs(
const std::vector<RtpCodecParameters>& codecs) {
std::vector<C> cricket_codecs;
std::set<int> seen_payload_types;
for (const RtpCodecParameters& codec : codecs) {
auto result = ToCricketCodec<C>(codec);
if (!result.ok()) {
return result.MoveError();
}
if (!seen_payload_types.insert(codec.payload_type).second) {
char buf[40];
rtc::SimpleStringBuilder sb(buf);
sb << "Duplicate payload type: " << codec.payload_type;
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER, sb.str());
}
cricket_codecs.push_back(result.MoveValue());
}
return std::move(cricket_codecs);
}
template RTCErrorOr<std::vector<cricket::AudioCodec>> ToCricketCodecs<
cricket::AudioCodec>(const std::vector<RtpCodecParameters>& codecs);
template RTCErrorOr<std::vector<cricket::VideoCodec>> ToCricketCodecs<
cricket::VideoCodec>(const std::vector<RtpCodecParameters>& codecs);
RTCErrorOr<cricket::RtpHeaderExtensions> ToCricketRtpHeaderExtensions(
const std::vector<RtpHeaderExtensionParameters>& extensions) {
cricket::RtpHeaderExtensions cricket_extensions;
std::set<int> seen_header_extension_ids;
for (const RtpHeaderExtensionParameters& extension : extensions) {
if (extension.id < RtpHeaderExtensionParameters::kMinId ||
extension.id > RtpHeaderExtensionParameters::kMaxId) {
char buf[50];
rtc::SimpleStringBuilder sb(buf);
sb << "Invalid header extension id: " << extension.id;
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE, sb.str());
}
if (!seen_header_extension_ids.insert(extension.id).second) {
char buf[50];
rtc::SimpleStringBuilder sb(buf);
sb << "Duplicate header extension id: " << extension.id;
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER, sb.str());
}
cricket_extensions.push_back(extension);
}
return std::move(cricket_extensions);
}
RTCErrorOr<cricket::StreamParamsVec> ToCricketStreamParamsVec(
const std::vector<RtpEncodingParameters>& encodings) {
if (encodings.size() > 1u) {
LOG_AND_RETURN_ERROR(RTCErrorType::UNSUPPORTED_PARAMETER,
"ORTC API implementation doesn't currently "
"support simulcast or layered encodings.");
} else if (encodings.empty()) {
return cricket::StreamParamsVec();
}
cricket::StreamParamsVec cricket_streams;
const RtpEncodingParameters& encoding = encodings[0];
if (encoding.rtx && encoding.rtx->ssrc && !encoding.ssrc) {
LOG_AND_RETURN_ERROR(RTCErrorType::UNSUPPORTED_PARAMETER,
"Setting an RTX SSRC explicitly while leaving the "
"primary SSRC unset is not currently supported.");
}
if (encoding.ssrc) {
cricket::StreamParams stream_params;
stream_params.add_ssrc(*encoding.ssrc);
if (encoding.rtx && encoding.rtx->ssrc) {
stream_params.AddFidSsrc(*encoding.ssrc, *encoding.rtx->ssrc);
}
cricket_streams.push_back(std::move(stream_params));
}
return std::move(cricket_streams);
}
absl::optional<RtcpFeedback> ToRtcpFeedback(
const cricket::FeedbackParam& cricket_feedback) {
if (cricket_feedback.id() == cricket::kRtcpFbParamCcm) {
if (cricket_feedback.param() == cricket::kRtcpFbCcmParamFir) {
return RtcpFeedback(RtcpFeedbackType::CCM, RtcpFeedbackMessageType::FIR);
} else {
RTC_LOG(LS_WARNING) << "Unsupported parameter for CCM RTCP feedback: "
<< cricket_feedback.param();
return absl::nullopt;
}
} else if (cricket_feedback.id() == cricket::kRtcpFbParamNack) {
if (cricket_feedback.param().empty()) {
return RtcpFeedback(RtcpFeedbackType::NACK,
RtcpFeedbackMessageType::GENERIC_NACK);
} else if (cricket_feedback.param() == cricket::kRtcpFbNackParamPli) {
return RtcpFeedback(RtcpFeedbackType::NACK, RtcpFeedbackMessageType::PLI);
} else {
RTC_LOG(LS_WARNING) << "Unsupported parameter for NACK RTCP feedback: "
<< cricket_feedback.param();
return absl::nullopt;
}
} else if (cricket_feedback.id() == cricket::kRtcpFbParamRemb) {
if (!cricket_feedback.param().empty()) {
RTC_LOG(LS_WARNING) << "Unsupported parameter for REMB RTCP feedback: "
<< cricket_feedback.param();
return absl::nullopt;
} else {
return RtcpFeedback(RtcpFeedbackType::REMB);
}
} else if (cricket_feedback.id() == cricket::kRtcpFbParamTransportCc) {
if (!cricket_feedback.param().empty()) {
RTC_LOG(LS_WARNING)
<< "Unsupported parameter for transport-cc RTCP feedback: "
<< cricket_feedback.param();
return absl::nullopt;
} else {
return RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC);
}
}
RTC_LOG(LS_WARNING) << "Unsupported RTCP feedback type: "
<< cricket_feedback.id();
return absl::nullopt;
}
std::vector<RtpEncodingParameters> ToRtpEncodings(
const cricket::StreamParamsVec& stream_params) {
std::vector<RtpEncodingParameters> rtp_encodings;
for (const cricket::StreamParams& stream_param : stream_params) {
RtpEncodingParameters rtp_encoding;
rtp_encoding.ssrc.emplace(stream_param.first_ssrc());
uint32_t rtx_ssrc = 0;
if (stream_param.GetFidSsrc(stream_param.first_ssrc(), &rtx_ssrc)) {
RtpRtxParameters rtx_param(rtx_ssrc);
rtp_encoding.rtx.emplace(rtx_param);
}
rtp_encodings.push_back(std::move(rtp_encoding));
}
return rtp_encodings;
}
template <typename C>
cricket::MediaType KindOfCodec();
template <>
cricket::MediaType KindOfCodec<cricket::AudioCodec>() {
return cricket::MEDIA_TYPE_AUDIO;
}
template <>
cricket::MediaType KindOfCodec<cricket::VideoCodec>() {
return cricket::MEDIA_TYPE_VIDEO;
}
template <typename C>
static void ToRtpCodecCapabilityTypeSpecific(const C& cricket_codec,
RtpCodecCapability* codec);
template <>
void ToRtpCodecCapabilityTypeSpecific<cricket::AudioCodec>(
const cricket::AudioCodec& cricket_codec,
RtpCodecCapability* codec) {
codec->num_channels = static_cast<int>(cricket_codec.channels);
}
template <>
void ToRtpCodecCapabilityTypeSpecific<cricket::VideoCodec>(
const cricket::VideoCodec& cricket_codec,
RtpCodecCapability* codec) {}
template <typename C>
RtpCodecCapability ToRtpCodecCapability(const C& cricket_codec) {
RtpCodecCapability codec;
codec.name = cricket_codec.name;
codec.kind = KindOfCodec<C>();
codec.clock_rate.emplace(cricket_codec.clockrate);
codec.preferred_payload_type.emplace(cricket_codec.id);
for (const cricket::FeedbackParam& cricket_feedback :
cricket_codec.feedback_params.params()) {
absl::optional<RtcpFeedback> feedback = ToRtcpFeedback(cricket_feedback);
if (feedback) {
codec.rtcp_feedback.push_back(feedback.value());
}
}
ToRtpCodecCapabilityTypeSpecific(cricket_codec, &codec);
codec.parameters.insert(cricket_codec.params.begin(),
cricket_codec.params.end());
return codec;
}
template RtpCodecCapability ToRtpCodecCapability<cricket::AudioCodec>(
const cricket::AudioCodec& cricket_codec);
template RtpCodecCapability ToRtpCodecCapability<cricket::VideoCodec>(
const cricket::VideoCodec& cricket_codec);
template <typename C>
static void ToRtpCodecParametersTypeSpecific(const C& cricket_codec,
RtpCodecParameters* codec);
template <>
void ToRtpCodecParametersTypeSpecific<cricket::AudioCodec>(
const cricket::AudioCodec& cricket_codec,
RtpCodecParameters* codec) {
codec->num_channels = static_cast<int>(cricket_codec.channels);
}
template <>
void ToRtpCodecParametersTypeSpecific<cricket::VideoCodec>(
const cricket::VideoCodec& cricket_codec,
RtpCodecParameters* codec) {}
template <typename C>
RtpCodecParameters ToRtpCodecParameters(const C& cricket_codec) {
RtpCodecParameters codec_param;
codec_param.name = cricket_codec.name;
codec_param.kind = KindOfCodec<C>();
codec_param.clock_rate.emplace(cricket_codec.clockrate);
codec_param.payload_type = cricket_codec.id;
for (const cricket::FeedbackParam& cricket_feedback :
cricket_codec.feedback_params.params()) {
absl::optional<RtcpFeedback> feedback = ToRtcpFeedback(cricket_feedback);
if (feedback) {
codec_param.rtcp_feedback.push_back(feedback.value());
}
}
ToRtpCodecParametersTypeSpecific(cricket_codec, &codec_param);
codec_param.parameters.insert(cricket_codec.params.begin(),
cricket_codec.params.end());
return codec_param;
}
template RtpCodecParameters ToRtpCodecParameters<cricket::AudioCodec>(
const cricket::AudioCodec& cricket_codec);
template RtpCodecParameters ToRtpCodecParameters<cricket::VideoCodec>(
const cricket::VideoCodec& cricket_codec);
template <class C>
RtpCapabilities ToRtpCapabilities(
const std::vector<C>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions) {
RtpCapabilities capabilities;
bool have_red = false;
bool have_ulpfec = false;
bool have_flexfec = false;
bool have_rtx = false;
for (const C& cricket_codec : cricket_codecs) {
if (cricket_codec.name == cricket::kRedCodecName) {
have_red = true;
} else if (cricket_codec.name == cricket::kUlpfecCodecName) {
have_ulpfec = true;
} else if (cricket_codec.name == cricket::kFlexfecCodecName) {
have_flexfec = true;
} else if (cricket_codec.name == cricket::kRtxCodecName) {
if (have_rtx) {
// There should only be one RTX codec entry
continue;
}
have_rtx = true;
}
auto codec_capability = ToRtpCodecCapability(cricket_codec);
if (cricket_codec.name == cricket::kRtxCodecName) {
// RTX codec should not have any parameter
codec_capability.parameters.clear();
}
capabilities.codecs.push_back(codec_capability);
}
for (const RtpExtension& cricket_extension : cricket_extensions) {
capabilities.header_extensions.emplace_back(cricket_extension.uri,
cricket_extension.id);
}
if (have_red) {
capabilities.fec.push_back(FecMechanism::RED);
}
if (have_red && have_ulpfec) {
capabilities.fec.push_back(FecMechanism::RED_AND_ULPFEC);
}
if (have_flexfec) {
capabilities.fec.push_back(FecMechanism::FLEXFEC);
}
return capabilities;
}
template RtpCapabilities ToRtpCapabilities<cricket::AudioCodec>(
const std::vector<cricket::AudioCodec>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions);
template RtpCapabilities ToRtpCapabilities<cricket::VideoCodec>(
const std::vector<cricket::VideoCodec>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions);
template <class C>
RtpParameters ToRtpParameters(
const std::vector<C>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions,
const cricket::StreamParamsVec& stream_params) {
RtpParameters rtp_parameters;
for (const C& cricket_codec : cricket_codecs) {
rtp_parameters.codecs.push_back(ToRtpCodecParameters(cricket_codec));
}
for (const RtpExtension& cricket_extension : cricket_extensions) {
rtp_parameters.header_extensions.emplace_back(cricket_extension.uri,
cricket_extension.id);
}
rtp_parameters.encodings = ToRtpEncodings(stream_params);
return rtp_parameters;
}
template RtpParameters ToRtpParameters<cricket::AudioCodec>(
const std::vector<cricket::AudioCodec>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions,
const cricket::StreamParamsVec& stream_params);
template RtpParameters ToRtpParameters<cricket::VideoCodec>(
const std::vector<cricket::VideoCodec>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions,
const cricket::StreamParamsVec& stream_params);
} // namespace webrtc