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/*
* 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 <optional>
#include <string>
#include <vector>
#include "api/media_types.h"
#include "api/rtp_parameters.h"
#include "media/base/codec.h"
#include "media/base/media_constants.h"
#include "pc/session_description.h"
#include "rtc_base/logging.h"
namespace webrtc {
std::optional<RtcpFeedback> ToRtcpFeedback(
const FeedbackParam& cricket_feedback) {
if (cricket_feedback.id() == kRtcpFbParamCcm) {
if (cricket_feedback.param() == kRtcpFbCcmParamFir) {
return RtcpFeedback(RtcpFeedbackType::CCM, RtcpFeedbackMessageType::FIR);
} else {
RTC_LOG(LS_WARNING) << "Unsupported parameter for CCM RTCP feedback: "
<< cricket_feedback.param();
return std::nullopt;
}
} else if (cricket_feedback.id() == kRtcpFbParamLntf) {
if (cricket_feedback.param().empty()) {
return RtcpFeedback(RtcpFeedbackType::LNTF);
} else {
RTC_LOG(LS_WARNING) << "Unsupported parameter for LNTF RTCP feedback: "
<< cricket_feedback.param();
return std::nullopt;
}
} else if (cricket_feedback.id() == kRtcpFbParamNack) {
if (cricket_feedback.param().empty()) {
return RtcpFeedback(RtcpFeedbackType::NACK,
RtcpFeedbackMessageType::GENERIC_NACK);
} else if (cricket_feedback.param() == kRtcpFbNackParamPli) {
return RtcpFeedback(RtcpFeedbackType::NACK, RtcpFeedbackMessageType::PLI);
} else {
RTC_LOG(LS_WARNING) << "Unsupported parameter for NACK RTCP feedback: "
<< cricket_feedback.param();
return std::nullopt;
}
} else if (cricket_feedback.id() == kRtcpFbParamRemb) {
if (!cricket_feedback.param().empty()) {
RTC_LOG(LS_WARNING) << "Unsupported parameter for REMB RTCP feedback: "
<< cricket_feedback.param();
return std::nullopt;
} else {
return RtcpFeedback(RtcpFeedbackType::REMB);
}
} else if (cricket_feedback.id() == kRtcpFbParamTransportCc) {
if (!cricket_feedback.param().empty()) {
RTC_LOG(LS_WARNING)
<< "Unsupported parameter for transport-cc RTCP feedback: "
<< cricket_feedback.param();
return std::nullopt;
} else {
return RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC);
}
}
RTC_LOG(LS_WARNING) << "Unsupported RTCP feedback type: "
<< cricket_feedback.id();
return std::nullopt;
}
RtpCodecCapability ToRtpCodecCapability(const Codec& cricket_codec) {
RtpCodecCapability codec;
codec.name = cricket_codec.name;
codec.kind = cricket_codec.type == Codec::Type::kAudio ? MediaType::AUDIO
: MediaType::VIDEO;
codec.clock_rate.emplace(cricket_codec.clockrate);
codec.preferred_payload_type.emplace(cricket_codec.id);
for (const FeedbackParam& cricket_feedback :
cricket_codec.feedback_params.params()) {
std::optional<RtcpFeedback> feedback = ToRtcpFeedback(cricket_feedback);
if (feedback) {
codec.rtcp_feedback.push_back(feedback.value());
}
}
switch (cricket_codec.type) {
case Codec::Type::kAudio:
codec.num_channels = static_cast<int>(cricket_codec.channels);
break;
case Codec::Type::kVideo:
codec.scalability_modes = cricket_codec.scalability_modes;
break;
}
codec.parameters.insert(cricket_codec.params.begin(),
cricket_codec.params.end());
return codec;
}
RtpCapabilities ToRtpCapabilities(
const std::vector<Codec>& cricket_codecs,
const RtpHeaderExtensions& cricket_extensions) {
RtpCapabilities capabilities;
bool have_red = false;
bool have_ulpfec = false;
bool have_flexfec = false;
bool have_rtx = false;
for (const Codec& cricket_codec : cricket_codecs) {
if (cricket_codec.name == kRedCodecName) {
if (have_red) {
// There should only be one RED codec entry in caps.
continue;
}
have_red = true;
} else if (cricket_codec.name == kUlpfecCodecName) {
have_ulpfec = true;
} else if (cricket_codec.name == kFlexfecCodecName) {
have_flexfec = true;
} else if (cricket_codec.name == kRtxCodecName) {
if (have_rtx) {
// There should only be one RTX codec entry in caps.
continue;
}
have_rtx = true;
}
auto codec_capability = ToRtpCodecCapability(cricket_codec);
if (cricket_codec.name == kRtxCodecName ||
cricket_codec.name == kRedCodecName) {
// For RTX this removes the APT which points to a payload type.
// For RED this removes the redundancy spec which points to a payload
// type.
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;
}
} // namespace webrtc
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