media/cast/receiver/cast_receiver_impl.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/cast/receiver/cast_receiver_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/callback.h"
  10 #include "base/debug/trace_event.h"
  11 #include "base/logging.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "media/cast/receiver/audio_decoder.h"
  14 #include "media/cast/receiver/video_decoder.h"
  15
  16 namespace media {
  17 namespace cast {
  18
  19 scoped_ptr<CastReceiver> CastReceiver::Create(
  20     scoped_refptr<CastEnvironment> cast_environment,
  21     const FrameReceiverConfig& audio_config,
  22     const FrameReceiverConfig& video_config,
  23     PacketSender* const packet_sender) {
  24   return scoped_ptr<CastReceiver>(new CastReceiverImpl(
  25       cast_environment, audio_config, video_config, packet_sender));
  26 }
  27
  28 CastReceiverImpl::CastReceiverImpl(
  29     scoped_refptr<CastEnvironment> cast_environment,
  30     const FrameReceiverConfig& audio_config,
  31     const FrameReceiverConfig& video_config,
  32     PacketSender* const packet_sender)
  33     : cast_environment_(cast_environment),
  34       pacer_(cast_environment->Clock(),
  35              cast_environment->Logging(),
  36              packet_sender,
  37              cast_environment->GetTaskRunner(CastEnvironment::MAIN)),
  38       audio_receiver_(cast_environment, audio_config, AUDIO_EVENT, &pacer_),
  39       video_receiver_(cast_environment, video_config, VIDEO_EVENT, &pacer_),
  40       ssrc_of_audio_sender_(audio_config.incoming_ssrc),
  41       ssrc_of_video_sender_(video_config.incoming_ssrc),
  42       num_audio_channels_(audio_config.channels),
  43       audio_sampling_rate_(audio_config.frequency),
  44       audio_codec_(audio_config.codec),
  45       video_codec_(video_config.codec) {}
  46
  47 CastReceiverImpl::~CastReceiverImpl() {}
  48
  49 void CastReceiverImpl::DispatchReceivedPacket(scoped_ptr<Packet> packet) {
  50   const uint8_t* const data = &packet->front();
  51   const size_t length = packet->size();
  52
  53   uint32 ssrc_of_sender;
  54   if (Rtcp::IsRtcpPacket(data, length)) {
  55     ssrc_of_sender = Rtcp::GetSsrcOfSender(data, length);
  56   } else if (!FrameReceiver::ParseSenderSsrc(data, length, &ssrc_of_sender)) {
  57     VLOG(1) << "Invalid RTP packet.";
  58     return;
  59   }
  60
  61   base::WeakPtr<FrameReceiver> target;
  62   if (ssrc_of_sender == ssrc_of_video_sender_) {
  63     target = video_receiver_.AsWeakPtr();
  64   } else if (ssrc_of_sender == ssrc_of_audio_sender_) {
  65     target = audio_receiver_.AsWeakPtr();
  66   } else {
  67     VLOG(1) << "Dropping packet with a non matching sender SSRC: "
  68             << ssrc_of_sender;
  69     return;
  70   }
  71   cast_environment_->PostTask(
  72       CastEnvironment::MAIN,
  73       FROM_HERE,
  74       base::Bind(base::IgnoreResult(&FrameReceiver::ProcessPacket),
  75                  target,
  76                  base::Passed(&packet)));
  77 }
  78
  79 PacketReceiverCallback CastReceiverImpl::packet_receiver() {
  80   return base::Bind(&CastReceiverImpl::DispatchReceivedPacket,
  81                     // TODO(miu): This code structure is dangerous, since the
  82                     // callback could be stored and then invoked after
  83                     // destruction of |this|.
  84                     base::Unretained(this));
  85 }
  86
  87 void CastReceiverImpl::RequestDecodedAudioFrame(
  88     const AudioFrameDecodedCallback& callback) {
  89   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
  90   DCHECK(!callback.is_null());
  91   audio_receiver_.RequestEncodedFrame(base::Bind(
  92       &CastReceiverImpl::DecodeEncodedAudioFrame,
  93       // Note: Use of Unretained is safe since this Closure is guaranteed to be
  94       // invoked or discarded by |audio_receiver_| before destruction of |this|.
  95       base::Unretained(this),
  96       callback));
  97 }
  98
  99 void CastReceiverImpl::RequestEncodedAudioFrame(
 100     const ReceiveEncodedFrameCallback& callback) {
 101   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 102   audio_receiver_.RequestEncodedFrame(callback);
 103 }
 104
 105 void CastReceiverImpl::RequestDecodedVideoFrame(
 106     const VideoFrameDecodedCallback& callback) {
 107   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 108   DCHECK(!callback.is_null());
 109   video_receiver_.RequestEncodedFrame(base::Bind(
 110       &CastReceiverImpl::DecodeEncodedVideoFrame,
 111       // Note: Use of Unretained is safe since this Closure is guaranteed to be
 112       // invoked or discarded by |video_receiver_| before destruction of |this|.
 113       base::Unretained(this),
 114       callback));
 115 }
 116
 117 void CastReceiverImpl::RequestEncodedVideoFrame(
 118     const ReceiveEncodedFrameCallback& callback) {
 119   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 120   video_receiver_.RequestEncodedFrame(callback);
 121 }
 122
 123 void CastReceiverImpl::DecodeEncodedAudioFrame(
 124     const AudioFrameDecodedCallback& callback,
 125     scoped_ptr<EncodedFrame> encoded_frame) {
 126   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 127   if (!encoded_frame) {
 128     callback.Run(make_scoped_ptr<AudioBus>(NULL), base::TimeTicks(), false);
 129     return;
 130   }
 131
 132   if (!audio_decoder_) {
 133     audio_decoder_.reset(new AudioDecoder(cast_environment_,
 134                                           num_audio_channels_,
 135                                           audio_sampling_rate_,
 136                                           audio_codec_));
 137   }
 138   const uint32 frame_id = encoded_frame->frame_id;
 139   const uint32 rtp_timestamp = encoded_frame->rtp_timestamp;
 140   const base::TimeTicks playout_time = encoded_frame->reference_time;
 141   audio_decoder_->DecodeFrame(
 142       encoded_frame.Pass(),
 143       base::Bind(&CastReceiverImpl::EmitDecodedAudioFrame,
 144                  cast_environment_,
 145                  callback,
 146                  frame_id,
 147                  rtp_timestamp,
 148                  playout_time));
 149 }
 150
 151 void CastReceiverImpl::DecodeEncodedVideoFrame(
 152     const VideoFrameDecodedCallback& callback,
 153     scoped_ptr<EncodedFrame> encoded_frame) {
 154   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 155   if (!encoded_frame) {
 156     callback.Run(
 157         make_scoped_refptr<VideoFrame>(NULL), base::TimeTicks(), false);
 158     return;
 159   }
 160
 161   // Used by chrome/browser/extension/api/cast_streaming/performance_test.cc
 162   TRACE_EVENT_INSTANT2(
 163       "cast_perf_test", "PullEncodedVideoFrame",
 164       TRACE_EVENT_SCOPE_THREAD,
 165       "rtp_timestamp", encoded_frame->rtp_timestamp,
 166       "render_time", encoded_frame->reference_time.ToInternalValue());
 167
 168   if (!video_decoder_)
 169     video_decoder_.reset(new VideoDecoder(cast_environment_, video_codec_));
 170   const uint32 frame_id = encoded_frame->frame_id;
 171   const uint32 rtp_timestamp = encoded_frame->rtp_timestamp;
 172   const base::TimeTicks playout_time = encoded_frame->reference_time;
 173   video_decoder_->DecodeFrame(
 174       encoded_frame.Pass(),
 175       base::Bind(&CastReceiverImpl::EmitDecodedVideoFrame,
 176                  cast_environment_,
 177                  callback,
 178                  frame_id,
 179                  rtp_timestamp,
 180                  playout_time));
 181 }
 182
 183 // static
 184 void CastReceiverImpl::EmitDecodedAudioFrame(
 185     const scoped_refptr<CastEnvironment>& cast_environment,
 186     const AudioFrameDecodedCallback& callback,
 187     uint32 frame_id,
 188     uint32 rtp_timestamp,
 189     const base::TimeTicks& playout_time,
 190     scoped_ptr<AudioBus> audio_bus,
 191     bool is_continuous) {
 192   DCHECK(cast_environment->CurrentlyOn(CastEnvironment::MAIN));
 193   if (audio_bus.get()) {
 194     const base::TimeTicks now = cast_environment->Clock()->NowTicks();
 195     cast_environment->Logging()->InsertFrameEvent(
 196         now, FRAME_DECODED, AUDIO_EVENT, rtp_timestamp, frame_id);
 197     cast_environment->Logging()->InsertFrameEventWithDelay(
 198         now, FRAME_PLAYOUT, AUDIO_EVENT, rtp_timestamp, frame_id,
 199         playout_time - now);
 200   }
 201   callback.Run(audio_bus.Pass(), playout_time, is_continuous);
 202 }
 203
 204 // static
 205 void CastReceiverImpl::EmitDecodedVideoFrame(
 206     const scoped_refptr<CastEnvironment>& cast_environment,
 207     const VideoFrameDecodedCallback& callback,
 208     uint32 frame_id,
 209     uint32 rtp_timestamp,
 210     const base::TimeTicks& playout_time,
 211     const scoped_refptr<VideoFrame>& video_frame,
 212     bool is_continuous) {
 213   DCHECK(cast_environment->CurrentlyOn(CastEnvironment::MAIN));
 214   if (video_frame.get()) {
 215     const base::TimeTicks now = cast_environment->Clock()->NowTicks();
 216     cast_environment->Logging()->InsertFrameEvent(
 217         now, FRAME_DECODED, VIDEO_EVENT, rtp_timestamp, frame_id);
 218     cast_environment->Logging()->InsertFrameEventWithDelay(
 219         now, FRAME_PLAYOUT, VIDEO_EVENT, rtp_timestamp, frame_id,
 220         playout_time - now);
 221
 222     // Used by chrome/browser/extension/api/cast_streaming/performance_test.cc
 223     TRACE_EVENT_INSTANT1(
 224         "cast_perf_test", "FrameDecoded",
 225         TRACE_EVENT_SCOPE_THREAD,
 226         "rtp_timestamp", rtp_timestamp);
 227   }
 228   callback.Run(video_frame, playout_time, is_continuous);
 229 }
 230
 231 }  // namespace cast
 232 }  // namespace media