webrtc/video/video_receive_stream.cc - src - Git at Google

 /*
  *  Copyright (c) 2013 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 "webrtc/video/video_receive_stream.h"

 #include <stdlib.h>

 #include <string>

 #include "webrtc/base/checks.h"
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/system_wrappers/interface/clock.h"
 #include "webrtc/system_wrappers/interface/logging.h"
 #include "webrtc/video/receive_statistics_proxy.h"
 #include "webrtc/video_encoder.h"
 #include "webrtc/video_engine/call_stats.h"
 #include "webrtc/video_receive_stream.h"

 namespace webrtc {

 static bool UseSendSideBwe(const std::vector<RtpExtension>& extensions) {
   for (const auto& extension : extensions) {
     if (extension.name == RtpExtension::kTransportSequenceNumber)
       return true;
   }
   return false;
 }

 std::string VideoReceiveStream::Decoder::ToString() const {
   std::stringstream ss;
   ss << "{decoder: " << (decoder != nullptr ? "(VideoDecoder)" : "nullptr");
   ss << ", payload_type: " << payload_type;
   ss << ", payload_name: " << payload_name;
   ss << ", is_renderer: " << (is_renderer ? "yes" : "no");
   ss << ", expected_delay_ms: " << expected_delay_ms;
   ss << '}';

   return ss.str();
 }

 std::string VideoReceiveStream::Config::ToString() const {
   std::stringstream ss;
   ss << "{decoders: [";
   for (size_t i = 0; i < decoders.size(); ++i) {
     ss << decoders[i].ToString();
     if (i != decoders.size() - 1)
       ss << ", ";
   }
   ss << ']';
   ss << ", rtp: " << rtp.ToString();
   ss << ", renderer: " << (renderer != nullptr ? "(renderer)" : "nullptr");
   ss << ", render_delay_ms: " << render_delay_ms;
   if (!sync_group.empty())
     ss << ", sync_group: " << sync_group;
   ss << ", pre_decode_callback: "
      << (pre_decode_callback != nullptr ? "(EncodedFrameObserver)" : "nullptr");
   ss << ", pre_render_callback: "
      << (pre_render_callback != nullptr ? "(I420FrameCallback)" : "nullptr");
   ss << ", target_delay_ms: " << target_delay_ms;
   ss << '}';

   return ss.str();
 }

 std::string VideoReceiveStream::Config::Rtp::ToString() const {
   std::stringstream ss;
   ss << "{remote_ssrc: " << remote_ssrc;
   ss << ", local_ssrc: " << local_ssrc;
   ss << ", rtcp_mode: "
      << (rtcp_mode == RtcpMode::kCompound ? "RtcpMode::kCompound"
                                           : "RtcpMode::kReducedSize");
   ss << ", rtcp_xr: ";
   ss << "{receiver_reference_time_report: "
      << (rtcp_xr.receiver_reference_time_report ? "on" : "off");
   ss << '}';
   ss << ", remb: " << (remb ? "on" : "off");
   ss << ", nack: {rtp_history_ms: " << nack.rtp_history_ms << '}';
   ss << ", fec: " << fec.ToString();
   ss << ", rtx: {";
   for (auto& kv : rtx) {
     ss << kv.first << " -> ";
     ss << "{ssrc: " << kv.second.ssrc;
     ss << ", payload_type: " << kv.second.payload_type;
     ss << '}';
   }
   ss << '}';
   ss << ", extensions: [";
   for (size_t i = 0; i < extensions.size(); ++i) {
     ss << extensions[i].ToString();
     if (i != extensions.size() - 1)
       ss << ", ";
   }
   ss << ']';
   ss << '}';
   return ss.str();
 }

 namespace internal {
 namespace {

 VideoCodec CreateDecoderVideoCodec(const VideoReceiveStream::Decoder& decoder) {
   VideoCodec codec;
   memset(&codec, 0, sizeof(codec));

   codec.plType = decoder.payload_type;
   strcpy(codec.plName, decoder.payload_name.c_str());
   if (decoder.payload_name == "VP8") {
     codec.codecType = kVideoCodecVP8;
   } else if (decoder.payload_name == "VP9") {
     codec.codecType = kVideoCodecVP9;
   } else if (decoder.payload_name == "H264") {
     codec.codecType = kVideoCodecH264;
   } else {
     codec.codecType = kVideoCodecGeneric;
   }

   if (codec.codecType == kVideoCodecVP8) {
     codec.codecSpecific.VP8 = VideoEncoder::GetDefaultVp8Settings();
   } else if (codec.codecType == kVideoCodecVP9) {
     codec.codecSpecific.VP9 = VideoEncoder::GetDefaultVp9Settings();
   } else if (codec.codecType == kVideoCodecH264) {
     codec.codecSpecific.H264 = VideoEncoder::GetDefaultH264Settings();
   }

   codec.width = 320;
   codec.height = 180;
   codec.startBitrate = codec.minBitrate = codec.maxBitrate =
       Call::Config::kDefaultStartBitrateBps / 1000;

   return codec;
 }
 }  // namespace

 VideoReceiveStream::VideoReceiveStream(int num_cpu_cores,
                                        ChannelGroup* channel_group,
                                        const VideoReceiveStream::Config& config,
                                        webrtc::VoiceEngine* voice_engine,
                                        ProcessThread* process_thread)
     : transport_adapter_(config.rtcp_send_transport),
       encoded_frame_proxy_(config.pre_decode_callback),
       config_(config),
       clock_(Clock::GetRealTimeClock()),
       channel_group_(channel_group) {
   LOG(LS_INFO) << "VideoReceiveStream: " << config_.ToString();

   bool send_side_bwe = UseSendSideBwe(config_.rtp.extensions);

   RemoteBitrateEstimator* bitrate_estimator =
       channel_group_->GetRemoteBitrateEstimator(send_side_bwe);

   vie_channel_.reset(new ViEChannel(
       num_cpu_cores, &transport_adapter_, process_thread,
       channel_group_->GetRtcpIntraFrameObserver(),
       channel_group_->GetBitrateController()->CreateRtcpBandwidthObserver(),
       nullptr, bitrate_estimator,
       channel_group_->GetCallStats()->rtcp_rtt_stats(), channel_group_->pacer(),
       channel_group_->packet_router(), 1, false));

   RTC_CHECK(vie_channel_->Init() == 0);

   // Register the channel to receive stats updates.
   channel_group_->GetCallStats()->RegisterStatsObserver(
       vie_channel_->GetStatsObserver());

   // TODO(pbos): This is not fine grained enough...
   vie_channel_->SetProtectionMode(config_.rtp.nack.rtp_history_ms > 0, false,
                                   -1, -1);
   RTC_DCHECK(config_.rtp.rtcp_mode != RtcpMode::kOff)
       << "A stream should not be configured with RTCP disabled. This value is "
          "reserved for internal usage.";
   vie_channel_->SetRTCPMode(config_.rtp.rtcp_mode);

   RTC_DCHECK(config_.rtp.remote_ssrc != 0);
   // TODO(pbos): What's an appropriate local_ssrc for receive-only streams?
   RTC_DCHECK(config_.rtp.local_ssrc != 0);
   RTC_DCHECK(config_.rtp.remote_ssrc != config_.rtp.local_ssrc);

   vie_channel_->SetSSRC(config_.rtp.local_ssrc, kViEStreamTypeNormal, 0);
   // TODO(pbos): Support multiple RTX, per video payload.
   Config::Rtp::RtxMap::const_iterator it = config_.rtp.rtx.begin();
   for (; it != config_.rtp.rtx.end(); ++it) {
     RTC_DCHECK(it->second.ssrc != 0);
     RTC_DCHECK(it->second.payload_type != 0);

     vie_channel_->SetRemoteSSRCType(kViEStreamTypeRtx, it->second.ssrc);
     vie_channel_->SetRtxReceivePayloadType(it->second.payload_type, it->first);
   }
   // TODO(holmer): When Chrome no longer depends on this being false by default,
   // always use the mapping and remove this whole codepath.
   vie_channel_->SetUseRtxPayloadMappingOnRestore(
       config_.rtp.use_rtx_payload_mapping_on_restore);

   // TODO(pbos): Remove channel_group_ usage from VideoReceiveStream. This
   // should be configured in call.cc.
   channel_group_->SetChannelRembStatus(false, config_.rtp.remb,
                                        vie_channel_.get());

   for (size_t i = 0; i < config_.rtp.extensions.size(); ++i) {
     const std::string& extension = config_.rtp.extensions[i].name;
     int id = config_.rtp.extensions[i].id;
     // One-byte-extension local identifiers are in the range 1-14 inclusive.
     RTC_DCHECK_GE(id, 1);
     RTC_DCHECK_LE(id, 14);
     if (extension == RtpExtension::kTOffset) {
       RTC_CHECK_EQ(0, vie_channel_->SetReceiveTimestampOffsetStatus(true, id));
     } else if (extension == RtpExtension::kAbsSendTime) {
       RTC_CHECK_EQ(0, vie_channel_->SetReceiveAbsoluteSendTimeStatus(true, id));
     } else if (extension == RtpExtension::kVideoRotation) {
       RTC_CHECK_EQ(0, vie_channel_->SetReceiveVideoRotationStatus(true, id));
     } else if (extension == RtpExtension::kTransportSequenceNumber) {
       RTC_CHECK_EQ(0,
                    vie_channel_->SetReceiveTransportSequenceNumber(true, id));
     } else {
       RTC_NOTREACHED() << "Unsupported RTP extension.";
     }
   }

   if (config_.rtp.fec.ulpfec_payload_type != -1) {
     // ULPFEC without RED doesn't make sense.
     RTC_DCHECK(config_.rtp.fec.red_payload_type != -1);
     VideoCodec codec;
     memset(&codec, 0, sizeof(codec));
     codec.codecType = kVideoCodecULPFEC;
     strcpy(codec.plName, "ulpfec");
     codec.plType = config_.rtp.fec.ulpfec_payload_type;
     RTC_CHECK_EQ(0, vie_channel_->SetReceiveCodec(codec));
   }
   if (config_.rtp.fec.red_payload_type != -1) {
     VideoCodec codec;
     memset(&codec, 0, sizeof(codec));
     codec.codecType = kVideoCodecRED;
     strcpy(codec.plName, "red");
     codec.plType = config_.rtp.fec.red_payload_type;
     RTC_CHECK_EQ(0, vie_channel_->SetReceiveCodec(codec));
     if (config_.rtp.fec.red_rtx_payload_type != -1) {
       vie_channel_->SetRtxReceivePayloadType(
           config_.rtp.fec.red_rtx_payload_type,
           config_.rtp.fec.red_payload_type);
     }
   }

   if (config.rtp.rtcp_xr.receiver_reference_time_report)
     vie_channel_->SetRtcpXrRrtrStatus(true);

   stats_proxy_.reset(
       new ReceiveStatisticsProxy(config_.rtp.remote_ssrc, clock_));

   vie_channel_->RegisterReceiveStatisticsProxy(stats_proxy_.get());
   vie_channel_->RegisterReceiveChannelRtcpStatisticsCallback(
       stats_proxy_.get());
   vie_channel_->RegisterReceiveChannelRtpStatisticsCallback(stats_proxy_.get());
   vie_channel_->RegisterRtcpPacketTypeCounterObserver(stats_proxy_.get());

   RTC_DCHECK(!config_.decoders.empty());
   for (size_t i = 0; i < config_.decoders.size(); ++i) {
     const Decoder& decoder = config_.decoders[i];
     RTC_CHECK_EQ(0,
                  vie_channel_->RegisterExternalDecoder(
                      decoder.payload_type, decoder.decoder, decoder.is_renderer,
                      decoder.is_renderer ? decoder.expected_delay_ms
                                          : config.render_delay_ms));

     VideoCodec codec = CreateDecoderVideoCodec(decoder);

     RTC_CHECK_EQ(0, vie_channel_->SetReceiveCodec(codec));
   }

   incoming_video_stream_.reset(new IncomingVideoStream(0));
   incoming_video_stream_->SetExpectedRenderDelay(config.render_delay_ms);
   incoming_video_stream_->SetExternalCallback(this);
   vie_channel_->SetIncomingVideoStream(incoming_video_stream_.get());

   if (config.pre_decode_callback)
     vie_channel_->RegisterPreDecodeImageCallback(&encoded_frame_proxy_);
   vie_channel_->RegisterPreRenderCallback(this);
 }

 VideoReceiveStream::~VideoReceiveStream() {
   LOG(LS_INFO) << "~VideoReceiveStream: " << config_.ToString();
   incoming_video_stream_->Stop();
   vie_channel_->RegisterPreRenderCallback(nullptr);
   vie_channel_->RegisterPreDecodeImageCallback(nullptr);

   for (size_t i = 0; i < config_.decoders.size(); ++i)
     vie_channel_->DeRegisterExternalDecoder(config_.decoders[i].payload_type);

   channel_group_->GetCallStats()->DeregisterStatsObserver(
       vie_channel_->GetStatsObserver());
   channel_group_->SetChannelRembStatus(false, false, vie_channel_.get());

   uint32_t remote_ssrc = vie_channel_->GetRemoteSSRC();
   bool send_side_bwe = UseSendSideBwe(config_.rtp.extensions);
   channel_group_->GetRemoteBitrateEstimator(send_side_bwe)->RemoveStream(
       remote_ssrc);
 }

 void VideoReceiveStream::Start() {
   transport_adapter_.Enable();
   incoming_video_stream_->Start();
   vie_channel_->StartReceive();
 }

 void VideoReceiveStream::Stop() {
   incoming_video_stream_->Stop();
   vie_channel_->StopReceive();
   transport_adapter_.Disable();
 }

 void VideoReceiveStream::SetSyncChannel(VoiceEngine* voice_engine,
                                         int audio_channel_id) {
   if (voice_engine != nullptr && audio_channel_id != -1) {
     VoEVideoSync* voe_sync_interface = VoEVideoSync::GetInterface(voice_engine);
     vie_channel_->SetVoiceChannel(audio_channel_id, voe_sync_interface);
     voe_sync_interface->Release();
   } else {
     vie_channel_->SetVoiceChannel(-1, nullptr);
   }
 }

 VideoReceiveStream::Stats VideoReceiveStream::GetStats() const {
   return stats_proxy_->GetStats();
 }

 bool VideoReceiveStream::DeliverRtcp(const uint8_t* packet, size_t length) {
   return vie_channel_->ReceivedRTCPPacket(packet, length) == 0;
 }

 bool VideoReceiveStream::DeliverRtp(const uint8_t* packet,
                                     size_t length,
                                     const PacketTime& packet_time) {
   return vie_channel_->ReceivedRTPPacket(packet, length, packet_time) == 0;
 }

 void VideoReceiveStream::FrameCallback(VideoFrame* video_frame) {
   stats_proxy_->OnDecodedFrame();

   // Post processing is not supported if the frame is backed by a texture.
   if (video_frame->native_handle() == NULL) {
     if (config_.pre_render_callback)
       config_.pre_render_callback->FrameCallback(video_frame);
   }
 }

 int VideoReceiveStream::RenderFrame(const uint32_t /*stream_id*/,
                                     const VideoFrame& video_frame) {
   // TODO(pbos): Wire up config_.render->IsTextureSupported() and convert if not
   // supported. Or provide methods for converting a texture frame in
   // VideoFrame.

   if (config_.renderer != nullptr)
     config_.renderer->RenderFrame(
         video_frame,
         video_frame.render_time_ms() - clock_->TimeInMilliseconds());

   stats_proxy_->OnRenderedFrame(video_frame.width(), video_frame.height());

   return 0;
 }

 void VideoReceiveStream::SignalNetworkState(NetworkState state) {
   vie_channel_->SetRTCPMode(state == kNetworkUp ? config_.rtp.rtcp_mode
                                                 : RtcpMode::kOff);
 }

 }  // namespace internal
 }  // namespace webrtc
	/*
	* Copyright (c) 2013 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 "webrtc/video/video_receive_stream.h"

	#include <stdlib.h>

	#include <string>

	#include "webrtc/base/checks.h"
	#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
	#include "webrtc/system_wrappers/interface/clock.h"
	#include "webrtc/system_wrappers/interface/logging.h"
	#include "webrtc/video/receive_statistics_proxy.h"
	#include "webrtc/video_encoder.h"
	#include "webrtc/video_engine/call_stats.h"
	#include "webrtc/video_receive_stream.h"

	namespace webrtc {

	static bool UseSendSideBwe(const std::vector<RtpExtension>& extensions) {
	for (const auto& extension : extensions) {
	if (extension.name == RtpExtension::kTransportSequenceNumber)
	return true;
	}
	return false;
	}

	std::string VideoReceiveStream::Decoder::ToString() const {
	std::stringstream ss;
	ss << "{decoder: " << (decoder != nullptr ? "(VideoDecoder)" : "nullptr");
	ss << ", payload_type: " << payload_type;
	ss << ", payload_name: " << payload_name;
	ss << ", is_renderer: " << (is_renderer ? "yes" : "no");
	ss << ", expected_delay_ms: " << expected_delay_ms;
	ss << '}';

	return ss.str();
	}

	std::string VideoReceiveStream::Config::ToString() const {
	std::stringstream ss;
	ss << "{decoders: [";
	for (size_t i = 0; i < decoders.size(); ++i) {
	ss << decoders[i].ToString();
	if (i != decoders.size() - 1)
	ss << ", ";
	}
	ss << ']';
	ss << ", rtp: " << rtp.ToString();
	ss << ", renderer: " << (renderer != nullptr ? "(renderer)" : "nullptr");
	ss << ", render_delay_ms: " << render_delay_ms;
	if (!sync_group.empty())
	ss << ", sync_group: " << sync_group;
	ss << ", pre_decode_callback: "
	<< (pre_decode_callback != nullptr ? "(EncodedFrameObserver)" : "nullptr");
	ss << ", pre_render_callback: "
	<< (pre_render_callback != nullptr ? "(I420FrameCallback)" : "nullptr");
	ss << ", target_delay_ms: " << target_delay_ms;
	ss << '}';

	return ss.str();
	}

	std::string VideoReceiveStream::Config::Rtp::ToString() const {
	std::stringstream ss;
	ss << "{remote_ssrc: " << remote_ssrc;
	ss << ", local_ssrc: " << local_ssrc;
	ss << ", rtcp_mode: "
	<< (rtcp_mode == RtcpMode::kCompound ? "RtcpMode::kCompound"
	: "RtcpMode::kReducedSize");
	ss << ", rtcp_xr: ";
	ss << "{receiver_reference_time_report: "
	<< (rtcp_xr.receiver_reference_time_report ? "on" : "off");
	ss << '}';
	ss << ", remb: " << (remb ? "on" : "off");
	ss << ", nack: {rtp_history_ms: " << nack.rtp_history_ms << '}';
	ss << ", fec: " << fec.ToString();
	ss << ", rtx: {";
	for (auto& kv : rtx) {
	ss << kv.first << " -> ";
	ss << "{ssrc: " << kv.second.ssrc;
	ss << ", payload_type: " << kv.second.payload_type;
	ss << '}';
	}
	ss << '}';
	ss << ", extensions: [";
	for (size_t i = 0; i < extensions.size(); ++i) {
	ss << extensions[i].ToString();
	if (i != extensions.size() - 1)
	ss << ", ";
	}
	ss << ']';
	ss << '}';
	return ss.str();
	}

	namespace internal {
	namespace {

	VideoCodec CreateDecoderVideoCodec(const VideoReceiveStream::Decoder& decoder) {
	VideoCodec codec;
	memset(&codec, 0, sizeof(codec));

	codec.plType = decoder.payload_type;
	strcpy(codec.plName, decoder.payload_name.c_str());
	if (decoder.payload_name == "VP8") {
	codec.codecType = kVideoCodecVP8;
	} else if (decoder.payload_name == "VP9") {
	codec.codecType = kVideoCodecVP9;
	} else if (decoder.payload_name == "H264") {
	codec.codecType = kVideoCodecH264;
	} else {
	codec.codecType = kVideoCodecGeneric;
	}

	if (codec.codecType == kVideoCodecVP8) {
	codec.codecSpecific.VP8 = VideoEncoder::GetDefaultVp8Settings();
	} else if (codec.codecType == kVideoCodecVP9) {
	codec.codecSpecific.VP9 = VideoEncoder::GetDefaultVp9Settings();
	} else if (codec.codecType == kVideoCodecH264) {
	codec.codecSpecific.H264 = VideoEncoder::GetDefaultH264Settings();
	}

	codec.width = 320;
	codec.height = 180;
	codec.startBitrate = codec.minBitrate = codec.maxBitrate =
	Call::Config::kDefaultStartBitrateBps / 1000;

	return codec;
	}
	} // namespace

	VideoReceiveStream::VideoReceiveStream(int num_cpu_cores,
	ChannelGroup* channel_group,
	const VideoReceiveStream::Config& config,
	webrtc::VoiceEngine* voice_engine,
	ProcessThread* process_thread)
	: transport_adapter_(config.rtcp_send_transport),
	encoded_frame_proxy_(config.pre_decode_callback),
	config_(config),
	clock_(Clock::GetRealTimeClock()),
	channel_group_(channel_group) {
	LOG(LS_INFO) << "VideoReceiveStream: " << config_.ToString();

	bool send_side_bwe = UseSendSideBwe(config_.rtp.extensions);

	RemoteBitrateEstimator* bitrate_estimator =
	channel_group_->GetRemoteBitrateEstimator(send_side_bwe);

	vie_channel_.reset(new ViEChannel(
	num_cpu_cores, &transport_adapter_, process_thread,
	channel_group_->GetRtcpIntraFrameObserver(),
	channel_group_->GetBitrateController()->CreateRtcpBandwidthObserver(),
	nullptr, bitrate_estimator,
	channel_group_->GetCallStats()->rtcp_rtt_stats(), channel_group_->pacer(),
	channel_group_->packet_router(), 1, false));

	RTC_CHECK(vie_channel_->Init() == 0);

	// Register the channel to receive stats updates.
	channel_group_->GetCallStats()->RegisterStatsObserver(
	vie_channel_->GetStatsObserver());

	// TODO(pbos): This is not fine grained enough...
	vie_channel_->SetProtectionMode(config_.rtp.nack.rtp_history_ms > 0, false,
	-1, -1);
	RTC_DCHECK(config_.rtp.rtcp_mode != RtcpMode::kOff)
	<< "A stream should not be configured with RTCP disabled. This value is "
	"reserved for internal usage.";
	vie_channel_->SetRTCPMode(config_.rtp.rtcp_mode);

	RTC_DCHECK(config_.rtp.remote_ssrc != 0);
	// TODO(pbos): What's an appropriate local_ssrc for receive-only streams?
	RTC_DCHECK(config_.rtp.local_ssrc != 0);
	RTC_DCHECK(config_.rtp.remote_ssrc != config_.rtp.local_ssrc);

	vie_channel_->SetSSRC(config_.rtp.local_ssrc, kViEStreamTypeNormal, 0);
	// TODO(pbos): Support multiple RTX, per video payload.
	Config::Rtp::RtxMap::const_iterator it = config_.rtp.rtx.begin();
	for (; it != config_.rtp.rtx.end(); ++it) {
	RTC_DCHECK(it->second.ssrc != 0);
	RTC_DCHECK(it->second.payload_type != 0);

	vie_channel_->SetRemoteSSRCType(kViEStreamTypeRtx, it->second.ssrc);
	vie_channel_->SetRtxReceivePayloadType(it->second.payload_type, it->first);
	}
	// TODO(holmer): When Chrome no longer depends on this being false by default,
	// always use the mapping and remove this whole codepath.
	vie_channel_->SetUseRtxPayloadMappingOnRestore(
	config_.rtp.use_rtx_payload_mapping_on_restore);

	// TODO(pbos): Remove channel_group_ usage from VideoReceiveStream. This
	// should be configured in call.cc.
	channel_group_->SetChannelRembStatus(false, config_.rtp.remb,
	vie_channel_.get());

	for (size_t i = 0; i < config_.rtp.extensions.size(); ++i) {
	const std::string& extension = config_.rtp.extensions[i].name;
	int id = config_.rtp.extensions[i].id;
	// One-byte-extension local identifiers are in the range 1-14 inclusive.
	RTC_DCHECK_GE(id, 1);
	RTC_DCHECK_LE(id, 14);
	if (extension == RtpExtension::kTOffset) {
	RTC_CHECK_EQ(0, vie_channel_->SetReceiveTimestampOffsetStatus(true, id));
	} else if (extension == RtpExtension::kAbsSendTime) {
	RTC_CHECK_EQ(0, vie_channel_->SetReceiveAbsoluteSendTimeStatus(true, id));
	} else if (extension == RtpExtension::kVideoRotation) {
	RTC_CHECK_EQ(0, vie_channel_->SetReceiveVideoRotationStatus(true, id));
	} else if (extension == RtpExtension::kTransportSequenceNumber) {
	RTC_CHECK_EQ(0,
	vie_channel_->SetReceiveTransportSequenceNumber(true, id));
	} else {
	RTC_NOTREACHED() << "Unsupported RTP extension.";
	}
	}

	if (config_.rtp.fec.ulpfec_payload_type != -1) {
	// ULPFEC without RED doesn't make sense.
	RTC_DCHECK(config_.rtp.fec.red_payload_type != -1);
	VideoCodec codec;
	memset(&codec, 0, sizeof(codec));
	codec.codecType = kVideoCodecULPFEC;
	strcpy(codec.plName, "ulpfec");
	codec.plType = config_.rtp.fec.ulpfec_payload_type;
	RTC_CHECK_EQ(0, vie_channel_->SetReceiveCodec(codec));
	}
	if (config_.rtp.fec.red_payload_type != -1) {
	VideoCodec codec;
	memset(&codec, 0, sizeof(codec));
	codec.codecType = kVideoCodecRED;
	strcpy(codec.plName, "red");
	codec.plType = config_.rtp.fec.red_payload_type;
	RTC_CHECK_EQ(0, vie_channel_->SetReceiveCodec(codec));
	if (config_.rtp.fec.red_rtx_payload_type != -1) {
	vie_channel_->SetRtxReceivePayloadType(
	config_.rtp.fec.red_rtx_payload_type,
	config_.rtp.fec.red_payload_type);
	}
	}

	if (config.rtp.rtcp_xr.receiver_reference_time_report)
	vie_channel_->SetRtcpXrRrtrStatus(true);

	stats_proxy_.reset(
	new ReceiveStatisticsProxy(config_.rtp.remote_ssrc, clock_));

	vie_channel_->RegisterReceiveStatisticsProxy(stats_proxy_.get());
	vie_channel_->RegisterReceiveChannelRtcpStatisticsCallback(
	stats_proxy_.get());
	vie_channel_->RegisterReceiveChannelRtpStatisticsCallback(stats_proxy_.get());
	vie_channel_->RegisterRtcpPacketTypeCounterObserver(stats_proxy_.get());

	RTC_DCHECK(!config_.decoders.empty());
	for (size_t i = 0; i < config_.decoders.size(); ++i) {
	const Decoder& decoder = config_.decoders[i];
	RTC_CHECK_EQ(0,
	vie_channel_->RegisterExternalDecoder(
	decoder.payload_type, decoder.decoder, decoder.is_renderer,
	decoder.is_renderer ? decoder.expected_delay_ms
	: config.render_delay_ms));

	VideoCodec codec = CreateDecoderVideoCodec(decoder);

	RTC_CHECK_EQ(0, vie_channel_->SetReceiveCodec(codec));
	}

	incoming_video_stream_.reset(new IncomingVideoStream(0));
	incoming_video_stream_->SetExpectedRenderDelay(config.render_delay_ms);
	incoming_video_stream_->SetExternalCallback(this);
	vie_channel_->SetIncomingVideoStream(incoming_video_stream_.get());

	if (config.pre_decode_callback)
	vie_channel_->RegisterPreDecodeImageCallback(&encoded_frame_proxy_);
	vie_channel_->RegisterPreRenderCallback(this);
	}

	VideoReceiveStream::~VideoReceiveStream() {
	LOG(LS_INFO) << "~VideoReceiveStream: " << config_.ToString();
	incoming_video_stream_->Stop();
	vie_channel_->RegisterPreRenderCallback(nullptr);
	vie_channel_->RegisterPreDecodeImageCallback(nullptr);

	for (size_t i = 0; i < config_.decoders.size(); ++i)
	vie_channel_->DeRegisterExternalDecoder(config_.decoders[i].payload_type);

	channel_group_->GetCallStats()->DeregisterStatsObserver(
	vie_channel_->GetStatsObserver());
	channel_group_->SetChannelRembStatus(false, false, vie_channel_.get());

	uint32_t remote_ssrc = vie_channel_->GetRemoteSSRC();
	bool send_side_bwe = UseSendSideBwe(config_.rtp.extensions);
	channel_group_->GetRemoteBitrateEstimator(send_side_bwe)->RemoveStream(
	remote_ssrc);
	}

	void VideoReceiveStream::Start() {
	transport_adapter_.Enable();
	incoming_video_stream_->Start();
	vie_channel_->StartReceive();
	}

	void VideoReceiveStream::Stop() {
	incoming_video_stream_->Stop();
	vie_channel_->StopReceive();
	transport_adapter_.Disable();
	}

	void VideoReceiveStream::SetSyncChannel(VoiceEngine* voice_engine,
	int audio_channel_id) {
	if (voice_engine != nullptr && audio_channel_id != -1) {
	VoEVideoSync* voe_sync_interface = VoEVideoSync::GetInterface(voice_engine);
	vie_channel_->SetVoiceChannel(audio_channel_id, voe_sync_interface);
	voe_sync_interface->Release();
	} else {
	vie_channel_->SetVoiceChannel(-1, nullptr);
	}
	}

	VideoReceiveStream::Stats VideoReceiveStream::GetStats() const {
	return stats_proxy_->GetStats();
	}

	bool VideoReceiveStream::DeliverRtcp(const uint8_t* packet, size_t length) {
	return vie_channel_->ReceivedRTCPPacket(packet, length) == 0;
	}

	bool VideoReceiveStream::DeliverRtp(const uint8_t* packet,
	size_t length,
	const PacketTime& packet_time) {
	return vie_channel_->ReceivedRTPPacket(packet, length, packet_time) == 0;
	}

	void VideoReceiveStream::FrameCallback(VideoFrame* video_frame) {
	stats_proxy_->OnDecodedFrame();

	// Post processing is not supported if the frame is backed by a texture.
	if (video_frame->native_handle() == NULL) {
	if (config_.pre_render_callback)
	config_.pre_render_callback->FrameCallback(video_frame);
	}
	}

	int VideoReceiveStream::RenderFrame(const uint32_t /stream_id/,
	const VideoFrame& video_frame) {
	// TODO(pbos): Wire up config_.render->IsTextureSupported() and convert if not
	// supported. Or provide methods for converting a texture frame in
	// VideoFrame.

	if (config_.renderer != nullptr)
	config_.renderer->RenderFrame(
	video_frame,
	video_frame.render_time_ms() - clock_->TimeInMilliseconds());

	stats_proxy_->OnRenderedFrame(video_frame.width(), video_frame.height());

	return 0;
	}

	void VideoReceiveStream::SignalNetworkState(NetworkState state) {
	vie_channel_->SetRTCPMode(state == kNetworkUp ? config_.rtp.rtcp_mode
	: RtcpMode::kOff);
	}

	} // namespace internal
	} // namespace webrtc