video/video_send_stream.cc - src/webrtc - 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_send_stream.h"

 #include <algorithm>
 #include <sstream>
 #include <string>
 #include <vector>

 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/system_wrappers/interface/logging.h"
 #include "webrtc/system_wrappers/interface/trace_event.h"
 #include "webrtc/video_engine/include/vie_base.h"
 #include "webrtc/video_engine/include/vie_capture.h"
 #include "webrtc/video_engine/include/vie_codec.h"
 #include "webrtc/video_engine/include/vie_external_codec.h"
 #include "webrtc/video_engine/include/vie_image_process.h"
 #include "webrtc/video_engine/include/vie_network.h"
 #include "webrtc/video_engine/include/vie_rtp_rtcp.h"
 #include "webrtc/video_engine/vie_defines.h"
 #include "webrtc/video_send_stream.h"

 namespace webrtc {
 std::string
 VideoSendStream::Config::EncoderSettings::ToString() const {
   std::stringstream ss;
   ss << "{payload_name: " << payload_name;
   ss << ", payload_type: " << payload_type;
   ss << ", encoder: " << (encoder != NULL ? "(VideoEncoder)" : "NULL");
   ss << '}';
   return ss.str();
 }

 std::string VideoSendStream::Config::Rtp::Rtx::ToString()
     const {
   std::stringstream ss;
   ss << "{ssrcs: [";
   for (size_t i = 0; i < ssrcs.size(); ++i) {
     ss << ssrcs[i];
     if (i != ssrcs.size() - 1)
       ss << ", ";
   }
   ss << ']';

   ss << ", payload_type: " << payload_type;
   ss << '}';
   return ss.str();
 }

 std::string VideoSendStream::Config::Rtp::ToString() const {
   std::stringstream ss;
   ss << "{ssrcs: [";
   for (size_t i = 0; i < ssrcs.size(); ++i) {
     ss << ssrcs[i];
     if (i != ssrcs.size() - 1)
       ss << ", ";
   }
   ss << ']';
   ss << ", max_packet_size: " << max_packet_size;
   ss << ", extensions: [";
   for (size_t i = 0; i < extensions.size(); ++i) {
     ss << extensions[i].ToString();
     if (i != extensions.size() - 1)
       ss << ", ";
   }
   ss << ']';

   ss << ", nack: {rtp_history_ms: " << nack.rtp_history_ms << '}';
   ss << ", fec: " << fec.ToString();
   ss << ", rtx: " << rtx.ToString();
   ss << ", c_name: " << c_name;
   ss << '}';
   return ss.str();
 }

 std::string VideoSendStream::Config::ToString() const {
   std::stringstream ss;
   ss << "{encoder_settings: " << encoder_settings.ToString();
   ss << ", rtp: " << rtp.ToString();
   ss << ", pre_encode_callback: "
      << (pre_encode_callback != NULL ? "(I420FrameCallback)" : "NULL");
   ss << ", post_encode_callback: "
      << (post_encode_callback != NULL ? "(EncodedFrameObserver)" : "NULL");
   ss << "local_renderer: " << (local_renderer != NULL ? "(VideoRenderer)"
                                                       : "NULL");
   ss << ", render_delay_ms: " << render_delay_ms;
   ss << ", target_delay_ms: " << target_delay_ms;
   ss << ", suspend_below_min_bitrate: " << (suspend_below_min_bitrate ? "on"
                                                                       : "off");
   ss << '}';
   return ss.str();
 }

 namespace internal {
 VideoSendStream::VideoSendStream(
     newapi::Transport* transport,
     CpuOveruseObserver* overuse_observer,
     webrtc::VideoEngine* video_engine,
     const VideoSendStream::Config& config,
     const VideoEncoderConfig& encoder_config,
     const std::map<uint32_t, RtpState>& suspended_ssrcs,
     int base_channel,
     Call::Config::BitrateConfig bitrate_config)
     : transport_adapter_(transport),
       encoded_frame_proxy_(config.post_encode_callback),
       config_(config),
       bitrate_config_(bitrate_config),
       suspended_ssrcs_(suspended_ssrcs),
       external_codec_(NULL),
       channel_(-1),
       use_config_bitrate_(true),
       stats_proxy_(Clock::GetRealTimeClock(), config) {
   // Duplicate assert checking of bitrate config. These should be checked in
   // Call but are added here for verbosity.
   assert(bitrate_config.min_bitrate_bps >= 0);
   assert(bitrate_config.start_bitrate_bps >= bitrate_config.min_bitrate_bps);
   if (bitrate_config.max_bitrate_bps != -1)
     assert(bitrate_config.max_bitrate_bps >= bitrate_config.start_bitrate_bps);

   video_engine_base_ = ViEBase::GetInterface(video_engine);
   video_engine_base_->CreateChannelWithoutDefaultEncoder(channel_,
                                                          base_channel);
   assert(channel_ != -1);

   rtp_rtcp_ = ViERTP_RTCP::GetInterface(video_engine);
   assert(rtp_rtcp_ != NULL);

   assert(config_.rtp.ssrcs.size() > 0);

   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;
     if (extension == RtpExtension::kTOffset) {
       if (rtp_rtcp_->SetSendTimestampOffsetStatus(channel_, true, id) != 0)
         abort();
     } else if (extension == RtpExtension::kAbsSendTime) {
       if (rtp_rtcp_->SetSendAbsoluteSendTimeStatus(channel_, true, id) != 0)
         abort();
     } else {
       abort();  // Unsupported extension.
     }
   }

   rtp_rtcp_->SetRembStatus(channel_, true, false);

   // Enable NACK, FEC or both.
   if (config_.rtp.fec.red_payload_type != -1) {
     assert(config_.rtp.fec.ulpfec_payload_type != -1);
     if (config_.rtp.nack.rtp_history_ms > 0) {
       rtp_rtcp_->SetHybridNACKFECStatus(
           channel_,
           true,
           static_cast<unsigned char>(config_.rtp.fec.red_payload_type),
           static_cast<unsigned char>(config_.rtp.fec.ulpfec_payload_type));
     } else {
       rtp_rtcp_->SetFECStatus(
           channel_,
           true,
           static_cast<unsigned char>(config_.rtp.fec.red_payload_type),
           static_cast<unsigned char>(config_.rtp.fec.ulpfec_payload_type));
     }
   } else {
     rtp_rtcp_->SetNACKStatus(channel_, config_.rtp.nack.rtp_history_ms > 0);
   }

   ConfigureSsrcs();

   char rtcp_cname[ViERTP_RTCP::KMaxRTCPCNameLength];
   assert(config_.rtp.c_name.length() < ViERTP_RTCP::KMaxRTCPCNameLength);
   strncpy(rtcp_cname, config_.rtp.c_name.c_str(), sizeof(rtcp_cname) - 1);
   rtcp_cname[sizeof(rtcp_cname) - 1] = '\0';

   rtp_rtcp_->SetRTCPCName(channel_, rtcp_cname);

   capture_ = ViECapture::GetInterface(video_engine);
   capture_->AllocateExternalCaptureDevice(capture_id_, external_capture_);
   capture_->ConnectCaptureDevice(capture_id_, channel_);

   network_ = ViENetwork::GetInterface(video_engine);
   assert(network_ != NULL);

   network_->RegisterSendTransport(channel_, transport_adapter_);
   // 28 to match packet overhead in ModuleRtpRtcpImpl.
   network_->SetMTU(channel_,
                    static_cast<unsigned int>(config_.rtp.max_packet_size + 28));

   assert(config.encoder_settings.encoder != NULL);
   assert(config.encoder_settings.payload_type >= 0);
   assert(config.encoder_settings.payload_type <= 127);
   external_codec_ = ViEExternalCodec::GetInterface(video_engine);
   if (external_codec_->RegisterExternalSendCodec(
           channel_,
           config.encoder_settings.payload_type,
           config.encoder_settings.encoder,
           false) != 0) {
     abort();
   }

   codec_ = ViECodec::GetInterface(video_engine);
   if (!ReconfigureVideoEncoder(encoder_config))
     abort();

   if (overuse_observer)
     video_engine_base_->RegisterCpuOveruseObserver(channel_, overuse_observer);

   video_engine_base_->RegisterSendSideDelayObserver(channel_, &stats_proxy_);
   video_engine_base_->RegisterSendStatisticsProxy(channel_, &stats_proxy_);

   image_process_ = ViEImageProcess::GetInterface(video_engine);
   image_process_->RegisterPreEncodeCallback(channel_,
                                             config_.pre_encode_callback);
   if (config_.post_encode_callback) {
     image_process_->RegisterPostEncodeImageCallback(channel_,
                                                     &encoded_frame_proxy_);
   }

   if (config_.suspend_below_min_bitrate)
     codec_->SuspendBelowMinBitrate(channel_);

   rtp_rtcp_->RegisterSendChannelRtcpStatisticsCallback(channel_,
                                                        &stats_proxy_);
   rtp_rtcp_->RegisterSendChannelRtpStatisticsCallback(channel_,
                                                       &stats_proxy_);
   rtp_rtcp_->RegisterSendBitrateObserver(channel_, &stats_proxy_);
   rtp_rtcp_->RegisterSendFrameCountObserver(channel_, &stats_proxy_);

   codec_->RegisterEncoderObserver(channel_, stats_proxy_);
   capture_->RegisterObserver(capture_id_, stats_proxy_);
 }

 VideoSendStream::~VideoSendStream() {
   capture_->DeregisterObserver(capture_id_);
   codec_->DeregisterEncoderObserver(channel_);

   rtp_rtcp_->DeregisterSendFrameCountObserver(channel_, &stats_proxy_);
   rtp_rtcp_->DeregisterSendBitrateObserver(channel_, &stats_proxy_);
   rtp_rtcp_->DeregisterSendChannelRtpStatisticsCallback(channel_,
                                                         &stats_proxy_);
   rtp_rtcp_->DeregisterSendChannelRtcpStatisticsCallback(channel_,
                                                          &stats_proxy_);

   image_process_->DeRegisterPreEncodeCallback(channel_);

   network_->DeregisterSendTransport(channel_);

   capture_->DisconnectCaptureDevice(channel_);
   capture_->ReleaseCaptureDevice(capture_id_);

   external_codec_->DeRegisterExternalSendCodec(
       channel_, config_.encoder_settings.payload_type);

   video_engine_base_->DeleteChannel(channel_);

   image_process_->Release();
   video_engine_base_->Release();
   capture_->Release();
   codec_->Release();
   if (external_codec_)
     external_codec_->Release();
   network_->Release();
   rtp_rtcp_->Release();
 }

 void VideoSendStream::SwapFrame(I420VideoFrame* frame) {
   // TODO(pbos): Local rendering should not be done on the capture thread.
   if (config_.local_renderer != NULL)
     config_.local_renderer->RenderFrame(*frame, 0);

   external_capture_->SwapFrame(frame);
 }

 VideoSendStreamInput* VideoSendStream::Input() { return this; }

 void VideoSendStream::Start() {
   transport_adapter_.Enable();
   video_engine_base_->StartSend(channel_);
   video_engine_base_->StartReceive(channel_);
 }

 void VideoSendStream::Stop() {
   video_engine_base_->StopSend(channel_);
   video_engine_base_->StopReceive(channel_);
   transport_adapter_.Disable();
 }

 bool VideoSendStream::ReconfigureVideoEncoder(
     const VideoEncoderConfig& config) {
   TRACE_EVENT0("webrtc", "VideoSendStream::(Re)configureVideoEncoder");
   LOG(LS_INFO) << "(Re)configureVideoEncoder: " << config.ToString();
   const std::vector<VideoStream>& streams = config.streams;
   assert(!streams.empty());
   assert(config_.rtp.ssrcs.size() >= streams.size());

   VideoCodec video_codec;
   memset(&video_codec, 0, sizeof(video_codec));
   if (config_.encoder_settings.payload_name == "VP8") {
     video_codec.codecType = kVideoCodecVP8;
   } else if (config_.encoder_settings.payload_name == "VP9") {
     video_codec.codecType = kVideoCodecVP9;
   } else if (config_.encoder_settings.payload_name == "H264") {
     video_codec.codecType = kVideoCodecH264;
   } else {
     video_codec.codecType = kVideoCodecGeneric;
   }

   switch (config.content_type) {
     case VideoEncoderConfig::kRealtimeVideo:
       video_codec.mode = kRealtimeVideo;
       break;
     case VideoEncoderConfig::kScreenshare:
       video_codec.mode = kScreensharing;
       if (config.streams.size() == 1 &&
           config.streams[0].temporal_layer_thresholds_bps.size() == 1) {
         video_codec.targetBitrate =
             config.streams[0].temporal_layer_thresholds_bps[0] / 1000;
       }
       break;
   }

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

   if (video_codec.codecType == kVideoCodecVP8) {
     if (config.encoder_specific_settings != NULL) {
       video_codec.codecSpecific.VP8 = *reinterpret_cast<const VideoCodecVP8*>(
                                           config.encoder_specific_settings);
     }
     video_codec.codecSpecific.VP8.numberOfTemporalLayers =
         static_cast<unsigned char>(
             streams.back().temporal_layer_thresholds_bps.size() + 1);
   } else {
     // TODO(pbos): Support encoder_settings codec-agnostically.
     assert(config.encoder_specific_settings == NULL);
   }

   strncpy(video_codec.plName,
           config_.encoder_settings.payload_name.c_str(),
           kPayloadNameSize - 1);
   video_codec.plName[kPayloadNameSize - 1] = '\0';
   video_codec.plType = config_.encoder_settings.payload_type;
   video_codec.numberOfSimulcastStreams =
       static_cast<unsigned char>(streams.size());
   video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;
   assert(streams.size() <= kMaxSimulcastStreams);
   for (size_t i = 0; i < streams.size(); ++i) {
     SimulcastStream* sim_stream = &video_codec.simulcastStream[i];
     assert(streams[i].width > 0);
     assert(streams[i].height > 0);
     assert(streams[i].max_framerate > 0);
     // Different framerates not supported per stream at the moment.
     assert(streams[i].max_framerate == streams[0].max_framerate);
     assert(streams[i].min_bitrate_bps >= 0);
     assert(streams[i].target_bitrate_bps >= streams[i].min_bitrate_bps);
     assert(streams[i].max_bitrate_bps >= streams[i].target_bitrate_bps);
     assert(streams[i].max_qp >= 0);

     sim_stream->width = static_cast<unsigned short>(streams[i].width);
     sim_stream->height = static_cast<unsigned short>(streams[i].height);
     sim_stream->minBitrate = streams[i].min_bitrate_bps / 1000;
     sim_stream->targetBitrate = streams[i].target_bitrate_bps / 1000;
     sim_stream->maxBitrate = streams[i].max_bitrate_bps / 1000;
     sim_stream->qpMax = streams[i].max_qp;
     sim_stream->numberOfTemporalLayers = static_cast<unsigned char>(
         streams[i].temporal_layer_thresholds_bps.size() + 1);

     video_codec.width = std::max(video_codec.width,
                                  static_cast<unsigned short>(streams[i].width));
     video_codec.height = std::max(
         video_codec.height, static_cast<unsigned short>(streams[i].height));
     video_codec.minBitrate =
         std::min(video_codec.minBitrate,
                  static_cast<unsigned int>(streams[i].min_bitrate_bps / 1000));
     video_codec.maxBitrate += streams[i].max_bitrate_bps / 1000;
     video_codec.qpMax = std::max(video_codec.qpMax,
                                  static_cast<unsigned int>(streams[i].max_qp));
   }
   // Clamp bitrates to the bitrate config.
   if (video_codec.minBitrate <
       static_cast<unsigned int>(bitrate_config_.min_bitrate_bps / 1000)) {
     video_codec.minBitrate = bitrate_config_.min_bitrate_bps / 1000;
   }
   if (bitrate_config_.max_bitrate_bps != -1 &&
       video_codec.maxBitrate >
           static_cast<unsigned int>(bitrate_config_.max_bitrate_bps / 1000)) {
     video_codec.maxBitrate = bitrate_config_.max_bitrate_bps / 1000;
   }
   unsigned int start_bitrate_bps;
   if (codec_->GetCodecTargetBitrate(channel_, &start_bitrate_bps) != 0 ||
       use_config_bitrate_) {
     start_bitrate_bps = bitrate_config_.start_bitrate_bps;
   }
   video_codec.startBitrate =
       static_cast<unsigned int>(start_bitrate_bps) / 1000;

   if (video_codec.minBitrate < kViEMinCodecBitrate)
     video_codec.minBitrate = kViEMinCodecBitrate;
   if (video_codec.maxBitrate < kViEMinCodecBitrate)
     video_codec.maxBitrate = kViEMinCodecBitrate;
   if (video_codec.startBitrate < video_codec.minBitrate)
     video_codec.startBitrate = video_codec.minBitrate;
   if (video_codec.startBitrate > video_codec.maxBitrate)
     video_codec.startBitrate = video_codec.maxBitrate;

   if (video_codec.startBitrate < video_codec.minBitrate)
     video_codec.startBitrate = video_codec.minBitrate;
   if (video_codec.startBitrate > video_codec.maxBitrate)
     video_codec.startBitrate = video_codec.maxBitrate;

   assert(streams[0].max_framerate > 0);
   video_codec.maxFramerate = streams[0].max_framerate;

   if (codec_->SetSendCodec(channel_, video_codec) != 0)
     return false;

   assert(config.min_transmit_bitrate_bps >= 0);
   rtp_rtcp_->SetMinTransmitBitrate(channel_,
                                    config.min_transmit_bitrate_bps / 1000);

   encoder_config_ = config;
   use_config_bitrate_ = false;
   return true;
 }

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

 VideoSendStream::Stats VideoSendStream::GetStats() {
   return stats_proxy_.GetStats();
 }

 void VideoSendStream::ConfigureSsrcs() {
   for (size_t i = 0; i < config_.rtp.ssrcs.size(); ++i) {
     uint32_t ssrc = config_.rtp.ssrcs[i];
     rtp_rtcp_->SetLocalSSRC(
         channel_, ssrc, kViEStreamTypeNormal, static_cast<unsigned char>(i));
     RtpStateMap::iterator it = suspended_ssrcs_.find(ssrc);
     if (it != suspended_ssrcs_.end())
       rtp_rtcp_->SetRtpStateForSsrc(channel_, ssrc, it->second);
   }

   if (config_.rtp.rtx.ssrcs.empty()) {
     return;
   }

   // Set up RTX.
   assert(config_.rtp.rtx.ssrcs.size() == config_.rtp.ssrcs.size());
   for (size_t i = 0; i < config_.rtp.rtx.ssrcs.size(); ++i) {
     uint32_t ssrc = config_.rtp.rtx.ssrcs[i];
     rtp_rtcp_->SetLocalSSRC(channel_,
                             config_.rtp.rtx.ssrcs[i],
                             kViEStreamTypeRtx,
                             static_cast<unsigned char>(i));
     RtpStateMap::iterator it = suspended_ssrcs_.find(ssrc);
     if (it != suspended_ssrcs_.end())
       rtp_rtcp_->SetRtpStateForSsrc(channel_, ssrc, it->second);
   }

   assert(config_.rtp.rtx.payload_type >= 0);
   rtp_rtcp_->SetRtxSendPayloadType(channel_, config_.rtp.rtx.payload_type);
 }

 std::map<uint32_t, RtpState> VideoSendStream::GetRtpStates() const {
   std::map<uint32_t, RtpState> rtp_states;
   for (size_t i = 0; i < config_.rtp.ssrcs.size(); ++i) {
     uint32_t ssrc = config_.rtp.ssrcs[i];
     rtp_states[ssrc] = rtp_rtcp_->GetRtpStateForSsrc(channel_, ssrc);
   }

   for (size_t i = 0; i < config_.rtp.rtx.ssrcs.size(); ++i) {
     uint32_t ssrc = config_.rtp.rtx.ssrcs[i];
     rtp_states[ssrc] = rtp_rtcp_->GetRtpStateForSsrc(channel_, ssrc);
   }

   return rtp_states;
 }

 void VideoSendStream::SetBitrateConfig(
     const Call::Config::BitrateConfig& bitrate_config) {
   int last_start_bitrate_bps = bitrate_config_.start_bitrate_bps;
   bitrate_config_ = bitrate_config;
   if (bitrate_config_.start_bitrate_bps <= 0) {
     bitrate_config_.start_bitrate_bps = last_start_bitrate_bps;
   } else {
     // Override start bitrate with bitrate from config.
     use_config_bitrate_ = true;
   }
   ReconfigureVideoEncoder(encoder_config_);
 }

 void VideoSendStream::SignalNetworkState(Call::NetworkState state) {
   // When network goes up, enable RTCP status before setting transmission state.
   // When it goes down, disable RTCP afterwards. This ensures that any packets
   // sent due to the network state changed will not be dropped.
   if (state == Call::kNetworkUp)
     rtp_rtcp_->SetRTCPStatus(channel_, kRtcpCompound_RFC4585);
   network_->SetNetworkTransmissionState(channel_, state == Call::kNetworkUp);
   if (state == Call::kNetworkDown)
     rtp_rtcp_->SetRTCPStatus(channel_, kRtcpNone);
 }

 int64_t VideoSendStream::GetPacerQueuingDelayMs() const {
   int64_t pacer_delay_ms = 0;
   if (rtp_rtcp_->GetPacerQueuingDelayMs(channel_, &pacer_delay_ms) != 0) {
     return 0;
   }
   return pacer_delay_ms;
 }

 int64_t VideoSendStream::GetRtt() const {
   webrtc::RtcpStatistics rtcp_stats;
   int64_t rtt_ms;
   if (rtp_rtcp_->GetSendChannelRtcpStatistics(channel_, rtcp_stats, rtt_ms) ==
       0) {
     return rtt_ms;
   }
   return -1;
 }
 }  // 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_send_stream.h"

	#include <algorithm>
	#include <sstream>
	#include <string>
	#include <vector>

	#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
	#include "webrtc/system_wrappers/interface/logging.h"
	#include "webrtc/system_wrappers/interface/trace_event.h"
	#include "webrtc/video_engine/include/vie_base.h"
	#include "webrtc/video_engine/include/vie_capture.h"
	#include "webrtc/video_engine/include/vie_codec.h"
	#include "webrtc/video_engine/include/vie_external_codec.h"
	#include "webrtc/video_engine/include/vie_image_process.h"
	#include "webrtc/video_engine/include/vie_network.h"
	#include "webrtc/video_engine/include/vie_rtp_rtcp.h"
	#include "webrtc/video_engine/vie_defines.h"
	#include "webrtc/video_send_stream.h"

	namespace webrtc {
	std::string
	VideoSendStream::Config::EncoderSettings::ToString() const {
	std::stringstream ss;
	ss << "{payload_name: " << payload_name;
	ss << ", payload_type: " << payload_type;
	ss << ", encoder: " << (encoder != NULL ? "(VideoEncoder)" : "NULL");
	ss << '}';
	return ss.str();
	}

	std::string VideoSendStream::Config::Rtp::Rtx::ToString()
	const {
	std::stringstream ss;
	ss << "{ssrcs: [";
	for (size_t i = 0; i < ssrcs.size(); ++i) {
	ss << ssrcs[i];
	if (i != ssrcs.size() - 1)
	ss << ", ";
	}
	ss << ']';

	ss << ", payload_type: " << payload_type;
	ss << '}';
	return ss.str();
	}

	std::string VideoSendStream::Config::Rtp::ToString() const {
	std::stringstream ss;
	ss << "{ssrcs: [";
	for (size_t i = 0; i < ssrcs.size(); ++i) {
	ss << ssrcs[i];
	if (i != ssrcs.size() - 1)
	ss << ", ";
	}
	ss << ']';
	ss << ", max_packet_size: " << max_packet_size;
	ss << ", extensions: [";
	for (size_t i = 0; i < extensions.size(); ++i) {
	ss << extensions[i].ToString();
	if (i != extensions.size() - 1)
	ss << ", ";
	}
	ss << ']';

	ss << ", nack: {rtp_history_ms: " << nack.rtp_history_ms << '}';
	ss << ", fec: " << fec.ToString();
	ss << ", rtx: " << rtx.ToString();
	ss << ", c_name: " << c_name;
	ss << '}';
	return ss.str();
	}

	std::string VideoSendStream::Config::ToString() const {
	std::stringstream ss;
	ss << "{encoder_settings: " << encoder_settings.ToString();
	ss << ", rtp: " << rtp.ToString();
	ss << ", pre_encode_callback: "
	<< (pre_encode_callback != NULL ? "(I420FrameCallback)" : "NULL");
	ss << ", post_encode_callback: "
	<< (post_encode_callback != NULL ? "(EncodedFrameObserver)" : "NULL");
	ss << "local_renderer: " << (local_renderer != NULL ? "(VideoRenderer)"
	: "NULL");
	ss << ", render_delay_ms: " << render_delay_ms;
	ss << ", target_delay_ms: " << target_delay_ms;
	ss << ", suspend_below_min_bitrate: " << (suspend_below_min_bitrate ? "on"
	: "off");
	ss << '}';
	return ss.str();
	}

	namespace internal {
	VideoSendStream::VideoSendStream(
	newapi::Transport* transport,
	CpuOveruseObserver* overuse_observer,
	webrtc::VideoEngine* video_engine,
	const VideoSendStream::Config& config,
	const VideoEncoderConfig& encoder_config,
	const std::map<uint32_t, RtpState>& suspended_ssrcs,
	int base_channel,
	Call::Config::BitrateConfig bitrate_config)
	: transport_adapter_(transport),
	encoded_frame_proxy_(config.post_encode_callback),
	config_(config),
	bitrate_config_(bitrate_config),
	suspended_ssrcs_(suspended_ssrcs),
	external_codec_(NULL),
	channel_(-1),
	use_config_bitrate_(true),
	stats_proxy_(Clock::GetRealTimeClock(), config) {
	// Duplicate assert checking of bitrate config. These should be checked in
	// Call but are added here for verbosity.
	assert(bitrate_config.min_bitrate_bps >= 0);
	assert(bitrate_config.start_bitrate_bps >= bitrate_config.min_bitrate_bps);
	if (bitrate_config.max_bitrate_bps != -1)
	assert(bitrate_config.max_bitrate_bps >= bitrate_config.start_bitrate_bps);

	video_engine_base_ = ViEBase::GetInterface(video_engine);
	video_engine_base_->CreateChannelWithoutDefaultEncoder(channel_,
	base_channel);
	assert(channel_ != -1);

	rtp_rtcp_ = ViERTP_RTCP::GetInterface(video_engine);
	assert(rtp_rtcp_ != NULL);

	assert(config_.rtp.ssrcs.size() > 0);

	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;
	if (extension == RtpExtension::kTOffset) {
	if (rtp_rtcp_->SetSendTimestampOffsetStatus(channel_, true, id) != 0)
	abort();
	} else if (extension == RtpExtension::kAbsSendTime) {
	if (rtp_rtcp_->SetSendAbsoluteSendTimeStatus(channel_, true, id) != 0)
	abort();
	} else {
	abort(); // Unsupported extension.
	}
	}

	rtp_rtcp_->SetRembStatus(channel_, true, false);

	// Enable NACK, FEC or both.
	if (config_.rtp.fec.red_payload_type != -1) {
	assert(config_.rtp.fec.ulpfec_payload_type != -1);
	if (config_.rtp.nack.rtp_history_ms > 0) {
	rtp_rtcp_->SetHybridNACKFECStatus(
	channel_,
	true,
	static_cast<unsigned char>(config_.rtp.fec.red_payload_type),
	static_cast<unsigned char>(config_.rtp.fec.ulpfec_payload_type));
	} else {
	rtp_rtcp_->SetFECStatus(
	channel_,
	true,
	static_cast<unsigned char>(config_.rtp.fec.red_payload_type),
	static_cast<unsigned char>(config_.rtp.fec.ulpfec_payload_type));
	}
	} else {
	rtp_rtcp_->SetNACKStatus(channel_, config_.rtp.nack.rtp_history_ms > 0);
	}

	ConfigureSsrcs();

	char rtcp_cname[ViERTP_RTCP::KMaxRTCPCNameLength];
	assert(config_.rtp.c_name.length() < ViERTP_RTCP::KMaxRTCPCNameLength);
	strncpy(rtcp_cname, config_.rtp.c_name.c_str(), sizeof(rtcp_cname) - 1);
	rtcp_cname[sizeof(rtcp_cname) - 1] = '\0';

	rtp_rtcp_->SetRTCPCName(channel_, rtcp_cname);

	capture_ = ViECapture::GetInterface(video_engine);
	capture_->AllocateExternalCaptureDevice(capture_id_, external_capture_);
	capture_->ConnectCaptureDevice(capture_id_, channel_);

	network_ = ViENetwork::GetInterface(video_engine);
	assert(network_ != NULL);

	network_->RegisterSendTransport(channel_, transport_adapter_);
	// 28 to match packet overhead in ModuleRtpRtcpImpl.
	network_->SetMTU(channel_,
	static_cast<unsigned int>(config_.rtp.max_packet_size + 28));

	assert(config.encoder_settings.encoder != NULL);
	assert(config.encoder_settings.payload_type >= 0);
	assert(config.encoder_settings.payload_type <= 127);
	external_codec_ = ViEExternalCodec::GetInterface(video_engine);
	if (external_codec_->RegisterExternalSendCodec(
	channel_,
	config.encoder_settings.payload_type,
	config.encoder_settings.encoder,
	false) != 0) {
	abort();
	}

	codec_ = ViECodec::GetInterface(video_engine);
	if (!ReconfigureVideoEncoder(encoder_config))
	abort();

	if (overuse_observer)
	video_engine_base_->RegisterCpuOveruseObserver(channel_, overuse_observer);

	video_engine_base_->RegisterSendSideDelayObserver(channel_, &stats_proxy_);
	video_engine_base_->RegisterSendStatisticsProxy(channel_, &stats_proxy_);

	image_process_ = ViEImageProcess::GetInterface(video_engine);
	image_process_->RegisterPreEncodeCallback(channel_,
	config_.pre_encode_callback);
	if (config_.post_encode_callback) {
	image_process_->RegisterPostEncodeImageCallback(channel_,
	&encoded_frame_proxy_);
	}

	if (config_.suspend_below_min_bitrate)
	codec_->SuspendBelowMinBitrate(channel_);

	rtp_rtcp_->RegisterSendChannelRtcpStatisticsCallback(channel_,
	&stats_proxy_);
	rtp_rtcp_->RegisterSendChannelRtpStatisticsCallback(channel_,
	&stats_proxy_);
	rtp_rtcp_->RegisterSendBitrateObserver(channel_, &stats_proxy_);
	rtp_rtcp_->RegisterSendFrameCountObserver(channel_, &stats_proxy_);

	codec_->RegisterEncoderObserver(channel_, stats_proxy_);
	capture_->RegisterObserver(capture_id_, stats_proxy_);
	}

	VideoSendStream::~VideoSendStream() {
	capture_->DeregisterObserver(capture_id_);
	codec_->DeregisterEncoderObserver(channel_);

	rtp_rtcp_->DeregisterSendFrameCountObserver(channel_, &stats_proxy_);
	rtp_rtcp_->DeregisterSendBitrateObserver(channel_, &stats_proxy_);
	rtp_rtcp_->DeregisterSendChannelRtpStatisticsCallback(channel_,
	&stats_proxy_);
	rtp_rtcp_->DeregisterSendChannelRtcpStatisticsCallback(channel_,
	&stats_proxy_);

	image_process_->DeRegisterPreEncodeCallback(channel_);

	network_->DeregisterSendTransport(channel_);

	capture_->DisconnectCaptureDevice(channel_);
	capture_->ReleaseCaptureDevice(capture_id_);

	external_codec_->DeRegisterExternalSendCodec(
	channel_, config_.encoder_settings.payload_type);

	video_engine_base_->DeleteChannel(channel_);

	image_process_->Release();
	video_engine_base_->Release();
	capture_->Release();
	codec_->Release();
	if (external_codec_)
	external_codec_->Release();
	network_->Release();
	rtp_rtcp_->Release();
	}

	void VideoSendStream::SwapFrame(I420VideoFrame* frame) {
	// TODO(pbos): Local rendering should not be done on the capture thread.
	if (config_.local_renderer != NULL)
	config_.local_renderer->RenderFrame(*frame, 0);

	external_capture_->SwapFrame(frame);
	}

	VideoSendStreamInput* VideoSendStream::Input() { return this; }

	void VideoSendStream::Start() {
	transport_adapter_.Enable();
	video_engine_base_->StartSend(channel_);
	video_engine_base_->StartReceive(channel_);
	}

	void VideoSendStream::Stop() {
	video_engine_base_->StopSend(channel_);
	video_engine_base_->StopReceive(channel_);
	transport_adapter_.Disable();
	}

	bool VideoSendStream::ReconfigureVideoEncoder(
	const VideoEncoderConfig& config) {
	TRACE_EVENT0("webrtc", "VideoSendStream::(Re)configureVideoEncoder");
	LOG(LS_INFO) << "(Re)configureVideoEncoder: " << config.ToString();
	const std::vector<VideoStream>& streams = config.streams;
	assert(!streams.empty());
	assert(config_.rtp.ssrcs.size() >= streams.size());

	VideoCodec video_codec;
	memset(&video_codec, 0, sizeof(video_codec));
	if (config_.encoder_settings.payload_name == "VP8") {
	video_codec.codecType = kVideoCodecVP8;
	} else if (config_.encoder_settings.payload_name == "VP9") {
	video_codec.codecType = kVideoCodecVP9;
	} else if (config_.encoder_settings.payload_name == "H264") {
	video_codec.codecType = kVideoCodecH264;
	} else {
	video_codec.codecType = kVideoCodecGeneric;
	}

	switch (config.content_type) {
	case VideoEncoderConfig::kRealtimeVideo:
	video_codec.mode = kRealtimeVideo;
	break;
	case VideoEncoderConfig::kScreenshare:
	video_codec.mode = kScreensharing;
	if (config.streams.size() == 1 &&
	config.streams[0].temporal_layer_thresholds_bps.size() == 1) {
	video_codec.targetBitrate =
	config.streams[0].temporal_layer_thresholds_bps[0] / 1000;
	}
	break;
	}

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

	if (video_codec.codecType == kVideoCodecVP8) {
	if (config.encoder_specific_settings != NULL) {
	video_codec.codecSpecific.VP8 = reinterpret_cast<const VideoCodecVP8>(
	config.encoder_specific_settings);
	}
	video_codec.codecSpecific.VP8.numberOfTemporalLayers =
	static_cast<unsigned char>(
	streams.back().temporal_layer_thresholds_bps.size() + 1);
	} else {
	// TODO(pbos): Support encoder_settings codec-agnostically.
	assert(config.encoder_specific_settings == NULL);
	}

	strncpy(video_codec.plName,
	config_.encoder_settings.payload_name.c_str(),
	kPayloadNameSize - 1);
	video_codec.plName[kPayloadNameSize - 1] = '\0';
	video_codec.plType = config_.encoder_settings.payload_type;
	video_codec.numberOfSimulcastStreams =
	static_cast<unsigned char>(streams.size());
	video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;
	assert(streams.size() <= kMaxSimulcastStreams);
	for (size_t i = 0; i < streams.size(); ++i) {
	SimulcastStream* sim_stream = &video_codec.simulcastStream[i];
	assert(streams[i].width > 0);
	assert(streams[i].height > 0);
	assert(streams[i].max_framerate > 0);
	// Different framerates not supported per stream at the moment.
	assert(streams[i].max_framerate == streams[0].max_framerate);
	assert(streams[i].min_bitrate_bps >= 0);
	assert(streams[i].target_bitrate_bps >= streams[i].min_bitrate_bps);
	assert(streams[i].max_bitrate_bps >= streams[i].target_bitrate_bps);
	assert(streams[i].max_qp >= 0);

	sim_stream->width = static_cast<unsigned short>(streams[i].width);
	sim_stream->height = static_cast<unsigned short>(streams[i].height);
	sim_stream->minBitrate = streams[i].min_bitrate_bps / 1000;
	sim_stream->targetBitrate = streams[i].target_bitrate_bps / 1000;
	sim_stream->maxBitrate = streams[i].max_bitrate_bps / 1000;
	sim_stream->qpMax = streams[i].max_qp;
	sim_stream->numberOfTemporalLayers = static_cast<unsigned char>(
	streams[i].temporal_layer_thresholds_bps.size() + 1);

	video_codec.width = std::max(video_codec.width,
	static_cast<unsigned short>(streams[i].width));
	video_codec.height = std::max(
	video_codec.height, static_cast<unsigned short>(streams[i].height));
	video_codec.minBitrate =
	std::min(video_codec.minBitrate,
	static_cast<unsigned int>(streams[i].min_bitrate_bps / 1000));
	video_codec.maxBitrate += streams[i].max_bitrate_bps / 1000;
	video_codec.qpMax = std::max(video_codec.qpMax,
	static_cast<unsigned int>(streams[i].max_qp));
	}
	// Clamp bitrates to the bitrate config.
	if (video_codec.minBitrate <
	static_cast<unsigned int>(bitrate_config_.min_bitrate_bps / 1000)) {
	video_codec.minBitrate = bitrate_config_.min_bitrate_bps / 1000;
	}
	if (bitrate_config_.max_bitrate_bps != -1 &&
	video_codec.maxBitrate >
	static_cast<unsigned int>(bitrate_config_.max_bitrate_bps / 1000)) {
	video_codec.maxBitrate = bitrate_config_.max_bitrate_bps / 1000;
	}
	unsigned int start_bitrate_bps;
	if (codec_->GetCodecTargetBitrate(channel_, &start_bitrate_bps) != 0 \|\|
	use_config_bitrate_) {
	start_bitrate_bps = bitrate_config_.start_bitrate_bps;
	}
	video_codec.startBitrate =
	static_cast<unsigned int>(start_bitrate_bps) / 1000;

	if (video_codec.minBitrate < kViEMinCodecBitrate)
	video_codec.minBitrate = kViEMinCodecBitrate;
	if (video_codec.maxBitrate < kViEMinCodecBitrate)
	video_codec.maxBitrate = kViEMinCodecBitrate;
	if (video_codec.startBitrate < video_codec.minBitrate)
	video_codec.startBitrate = video_codec.minBitrate;
	if (video_codec.startBitrate > video_codec.maxBitrate)
	video_codec.startBitrate = video_codec.maxBitrate;

	if (video_codec.startBitrate < video_codec.minBitrate)
	video_codec.startBitrate = video_codec.minBitrate;
	if (video_codec.startBitrate > video_codec.maxBitrate)
	video_codec.startBitrate = video_codec.maxBitrate;

	assert(streams[0].max_framerate > 0);
	video_codec.maxFramerate = streams[0].max_framerate;

	if (codec_->SetSendCodec(channel_, video_codec) != 0)
	return false;

	assert(config.min_transmit_bitrate_bps >= 0);
	rtp_rtcp_->SetMinTransmitBitrate(channel_,
	config.min_transmit_bitrate_bps / 1000);

	encoder_config_ = config;
	use_config_bitrate_ = false;
	return true;
	}

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

	VideoSendStream::Stats VideoSendStream::GetStats() {
	return stats_proxy_.GetStats();
	}

	void VideoSendStream::ConfigureSsrcs() {
	for (size_t i = 0; i < config_.rtp.ssrcs.size(); ++i) {
	uint32_t ssrc = config_.rtp.ssrcs[i];
	rtp_rtcp_->SetLocalSSRC(
	channel_, ssrc, kViEStreamTypeNormal, static_cast<unsigned char>(i));
	RtpStateMap::iterator it = suspended_ssrcs_.find(ssrc);
	if (it != suspended_ssrcs_.end())
	rtp_rtcp_->SetRtpStateForSsrc(channel_, ssrc, it->second);
	}

	if (config_.rtp.rtx.ssrcs.empty()) {
	return;
	}

	// Set up RTX.
	assert(config_.rtp.rtx.ssrcs.size() == config_.rtp.ssrcs.size());
	for (size_t i = 0; i < config_.rtp.rtx.ssrcs.size(); ++i) {
	uint32_t ssrc = config_.rtp.rtx.ssrcs[i];
	rtp_rtcp_->SetLocalSSRC(channel_,
	config_.rtp.rtx.ssrcs[i],
	kViEStreamTypeRtx,
	static_cast<unsigned char>(i));
	RtpStateMap::iterator it = suspended_ssrcs_.find(ssrc);
	if (it != suspended_ssrcs_.end())
	rtp_rtcp_->SetRtpStateForSsrc(channel_, ssrc, it->second);
	}

	assert(config_.rtp.rtx.payload_type >= 0);
	rtp_rtcp_->SetRtxSendPayloadType(channel_, config_.rtp.rtx.payload_type);
	}

	std::map<uint32_t, RtpState> VideoSendStream::GetRtpStates() const {
	std::map<uint32_t, RtpState> rtp_states;
	for (size_t i = 0; i < config_.rtp.ssrcs.size(); ++i) {
	uint32_t ssrc = config_.rtp.ssrcs[i];
	rtp_states[ssrc] = rtp_rtcp_->GetRtpStateForSsrc(channel_, ssrc);
	}

	for (size_t i = 0; i < config_.rtp.rtx.ssrcs.size(); ++i) {
	uint32_t ssrc = config_.rtp.rtx.ssrcs[i];
	rtp_states[ssrc] = rtp_rtcp_->GetRtpStateForSsrc(channel_, ssrc);
	}

	return rtp_states;
	}

	void VideoSendStream::SetBitrateConfig(
	const Call::Config::BitrateConfig& bitrate_config) {
	int last_start_bitrate_bps = bitrate_config_.start_bitrate_bps;
	bitrate_config_ = bitrate_config;
	if (bitrate_config_.start_bitrate_bps <= 0) {
	bitrate_config_.start_bitrate_bps = last_start_bitrate_bps;
	} else {
	// Override start bitrate with bitrate from config.
	use_config_bitrate_ = true;
	}
	ReconfigureVideoEncoder(encoder_config_);
	}

	void VideoSendStream::SignalNetworkState(Call::NetworkState state) {
	// When network goes up, enable RTCP status before setting transmission state.
	// When it goes down, disable RTCP afterwards. This ensures that any packets
	// sent due to the network state changed will not be dropped.
	if (state == Call::kNetworkUp)
	rtp_rtcp_->SetRTCPStatus(channel_, kRtcpCompound_RFC4585);
	network_->SetNetworkTransmissionState(channel_, state == Call::kNetworkUp);
	if (state == Call::kNetworkDown)
	rtp_rtcp_->SetRTCPStatus(channel_, kRtcpNone);
	}

	int64_t VideoSendStream::GetPacerQueuingDelayMs() const {
	int64_t pacer_delay_ms = 0;
	if (rtp_rtcp_->GetPacerQueuingDelayMs(channel_, &pacer_delay_ms) != 0) {
	return 0;
	}
	return pacer_delay_ms;
	}

	int64_t VideoSendStream::GetRtt() const {
	webrtc::RtcpStatistics rtcp_stats;
	int64_t rtt_ms;
	if (rtp_rtcp_->GetSendChannelRtcpStatistics(channel_, rtcp_stats, rtt_ms) ==
	0) {
	return rtt_ms;
	}
	return -1;
	}
	} // namespace internal
	} // namespace webrtc