| /* |
| * 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 <type_traits> |
| #include <utility> |
| |
| #include "api/array_view.h" |
| #include "api/media_types.h" |
| #include "api/rtc_error.h" |
| #include "media/base/codec.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::LNTF: |
| if (feedback.message_type) { |
| LOG_AND_RETURN_ERROR( |
| RTCErrorType::INVALID_PARAMETER, |
| "Didn't expect message type in LNTF RtcpFeedback."); |
| } |
| return cricket::FeedbackParam(cricket::kRtcpFbParamLntf); |
| 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); |
| } |
| RTC_CHECK_NOTREACHED(); |
| } |
| |
| RTCErrorOr<cricket::Codec> ToCricketCodec(const RtpCodecParameters& codec) { |
| switch (codec.kind) { |
| case cricket::MEDIA_TYPE_AUDIO: |
| 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."); |
| } |
| 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."); |
| } |
| break; |
| case cricket::MEDIA_TYPE_VIDEO: |
| 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."); |
| } |
| break; |
| default: |
| LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER, |
| "Unknown codec type"); |
| } |
| |
| 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 cricket_codec = [&]() { |
| if (codec.kind == cricket::MEDIA_TYPE_AUDIO) { |
| return cricket::CreateAudioCodec(codec.payload_type, codec.name, |
| *codec.clock_rate, *codec.num_channels); |
| } |
| RTC_DCHECK(codec.kind == cricket::MEDIA_TYPE_VIDEO); |
| return cricket::CreateVideoCodec(codec.payload_type, codec.name); |
| }(); |
| |
| 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 = codec.parameters; |
| return std::move(cricket_codec); |
| } |
| |
| RTCErrorOr<std::vector<cricket::Codec>> ToCricketCodecs( |
| const std::vector<RtpCodecParameters>& codecs) { |
| std::vector<cricket::Codec> cricket_codecs; |
| std::set<int> seen_payload_types; |
| for (const RtpCodecParameters& codec : codecs) { |
| auto result = ToCricketCodec(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); |
| } |
| |
| 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.ssrc) { |
| cricket::StreamParams stream_params; |
| stream_params.add_ssrc(*encoding.ssrc); |
| cricket_streams.push_back(std::move(stream_params)); |
| } |
| return std::move(cricket_streams); |
| } |
| |
| std::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 std::nullopt; |
| } |
| } else if (cricket_feedback.id() == cricket::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() == 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 std::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 std::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 std::nullopt; |
| } else { |
| return RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC); |
| } |
| } |
| RTC_LOG(LS_WARNING) << "Unsupported RTCP feedback type: " |
| << cricket_feedback.id(); |
| return std::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()); |
| rtp_encodings.push_back(std::move(rtp_encoding)); |
| } |
| return rtp_encodings; |
| } |
| |
| RtpCodecCapability ToRtpCodecCapability(const cricket::Codec& cricket_codec) { |
| RtpCodecCapability codec; |
| codec.name = cricket_codec.name; |
| codec.kind = cricket_codec.type == cricket::Codec::Type::kAudio |
| ? cricket::MEDIA_TYPE_AUDIO |
| : cricket::MEDIA_TYPE_VIDEO; |
| 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()) { |
| std::optional<RtcpFeedback> feedback = ToRtcpFeedback(cricket_feedback); |
| if (feedback) { |
| codec.rtcp_feedback.push_back(feedback.value()); |
| } |
| } |
| switch (cricket_codec.type) { |
| case cricket::Codec::Type::kAudio: |
| codec.num_channels = static_cast<int>(cricket_codec.channels); |
| break; |
| case cricket::Codec::Type::kVideo: |
| codec.scalability_modes = cricket_codec.scalability_modes; |
| break; |
| } |
| codec.parameters.insert(cricket_codec.params.begin(), |
| cricket_codec.params.end()); |
| return codec; |
| } |
| |
| RtpCodecParameters ToRtpCodecParameters(const cricket::Codec& cricket_codec) { |
| RtpCodecParameters codec_param; |
| codec_param.name = cricket_codec.name; |
| codec_param.kind = cricket_codec.type == cricket::Codec::Type::kAudio |
| ? cricket::MEDIA_TYPE_AUDIO |
| : cricket::MEDIA_TYPE_VIDEO; |
| 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()) { |
| std::optional<RtcpFeedback> feedback = ToRtcpFeedback(cricket_feedback); |
| if (feedback) { |
| codec_param.rtcp_feedback.push_back(feedback.value()); |
| } |
| } |
| switch (cricket_codec.type) { |
| case cricket::Codec::Type::kAudio: |
| codec_param.num_channels = static_cast<int>(cricket_codec.channels); |
| break; |
| case cricket::Codec::Type::kVideo: |
| // Nothing to do. |
| break; |
| } |
| codec_param.parameters = cricket_codec.params; |
| return codec_param; |
| } |
| |
| RtpCapabilities ToRtpCapabilities( |
| const std::vector<cricket::Codec>& 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 cricket::Codec& 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; |
| } |
| |
| RtpParameters ToRtpParameters( |
| const std::vector<cricket::Codec>& cricket_codecs, |
| const cricket::RtpHeaderExtensions& cricket_extensions, |
| const cricket::StreamParamsVec& stream_params) { |
| RtpParameters rtp_parameters; |
| for (const cricket::Codec& 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; |
| } |
| |
| } // namespace webrtc |
