The Tor Browser: content/media/encoder/TrackEncoder.cpp@44a2da4a2ab2 (annotated)

content/media/encoder/TrackEncoder.cpp@44a2da4a2ab2 (annotated)

content/media/encoder/TrackEncoder.cpp

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "TrackEncoder.h"
 #include "AudioChannelFormat.h"
 #include "MediaStreamGraph.h"
 #include "prlog.h"
 #include "VideoUtils.h"
 #undef LOG
 #ifdef MOZ_WIDGET_GONK
 #include <android/log.h>
 #define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "MediaEncoder", ## args);
 #else
 #define LOG(args, ...)
 #endif
 namespace mozilla {
 #ifdef PR_LOGGING
 PRLogModuleInfo* gTrackEncoderLog;
 #define TRACK_LOG(type, msg) PR_LOG(gTrackEncoderLog, type, msg)
 #else
 #define TRACK_LOG(type, msg)
 #endif
 static const int DEFAULT_CHANNELS = 1;
 static const int DEFAULT_SAMPLING_RATE = 16000;
 static const int DEFAULT_FRAME_WIDTH = 640;
 static const int DEFAULT_FRAME_HEIGHT = 480;
 static const int DEFAULT_TRACK_RATE = USECS_PER_S;
 TrackEncoder::TrackEncoder()
   : mReentrantMonitor("media.TrackEncoder")
   , mEncodingComplete(false)
   , mEosSetInEncoder(false)
   , mInitialized(false)
   , mEndOfStream(false)
   , mCanceled(false)
 #ifdef PR_LOGGING
   , mAudioInitCounter(0)
   , mVideoInitCounter(0)
 #endif
 {
 #ifdef PR_LOGGING
   if (!gTrackEncoderLog) {
     gTrackEncoderLog = PR_NewLogModule("TrackEncoder");
   }
 #endif
 }
 void
 AudioTrackEncoder::NotifyQueuedTrackChanges(MediaStreamGraph* aGraph,
                                             TrackID aID,
                                             TrackRate aTrackRate,
                                             TrackTicks aTrackOffset,
                                             uint32_t aTrackEvents,
                                             const MediaSegment& aQueuedMedia)
 {
   if (mCanceled) {
     return;
   }
   const AudioSegment& audio = static_cast<const AudioSegment&>(aQueuedMedia);
   // Check and initialize parameters for codec encoder.
   if (!mInitialized) {
 #ifdef PR_LOGGING
     mAudioInitCounter++;
     TRACK_LOG(PR_LOG_DEBUG, ("Init the audio encoder %d times", mAudioInitCounter));
 #endif
     AudioSegment::ChunkIterator iter(const_cast<AudioSegment&>(audio));
     while (!iter.IsEnded()) {
       AudioChunk chunk = *iter;
       // The number of channels is determined by the first non-null chunk, and
       // thus the audio encoder is initialized at this time.
       if (!chunk.IsNull()) {
         nsresult rv = Init(chunk.mChannelData.Length(), aTrackRate);
         if (NS_FAILED(rv)) {
           LOG("[AudioTrackEncoder]: Fail to initialize the encoder!");
           NotifyCancel();
         }
         break;
       }
       iter.Next();
     }
   }
   // Append and consume this raw segment.
   AppendAudioSegment(audio);
   // The stream has stopped and reached the end of track.
   if (aTrackEvents == MediaStreamListener::TRACK_EVENT_ENDED) {
     LOG("[AudioTrackEncoder]: Receive TRACK_EVENT_ENDED .");
     NotifyEndOfStream();
   }
 }
 void
 AudioTrackEncoder::NotifyEndOfStream()
 {
   // If source audio track is completely silent till the end of encoding,
   // initialize the encoder with default channel counts and sampling rate.
   if (!mCanceled && !mInitialized) {
     Init(DEFAULT_CHANNELS, DEFAULT_SAMPLING_RATE);
   }
   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
   mEndOfStream = true;
   mReentrantMonitor.NotifyAll();
 }
 nsresult
 AudioTrackEncoder::AppendAudioSegment(const AudioSegment& aSegment)
 {
   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
   AudioSegment::ChunkIterator iter(const_cast<AudioSegment&>(aSegment));
   while (!iter.IsEnded()) {
     AudioChunk chunk = *iter;
     // Append and consume both non-null and null chunks.
     mRawSegment.AppendAndConsumeChunk(&chunk);
     iter.Next();
   }
   if (mRawSegment.GetDuration() >= GetPacketDuration()) {
     mReentrantMonitor.NotifyAll();
   }
   return NS_OK;
 }
 static const int AUDIO_PROCESSING_FRAMES = 640; /* > 10ms of 48KHz audio */
 static const uint8_t gZeroChannel[MAX_AUDIO_SAMPLE_SIZE*AUDIO_PROCESSING_FRAMES] = {0};
 /*static*/
 void
 AudioTrackEncoder::InterleaveTrackData(AudioChunk& aChunk,
                                        int32_t aDuration,
                                        uint32_t aOutputChannels,
                                        AudioDataValue* aOutput)
 {
   if (aChunk.mChannelData.Length() < aOutputChannels) {
     // Up-mix. This might make the mChannelData have more than aChannels.
     AudioChannelsUpMix(&aChunk.mChannelData, aOutputChannels, gZeroChannel);
   }
   if (aChunk.mChannelData.Length() > aOutputChannels) {
     DownmixAndInterleave(aChunk.mChannelData, aChunk.mBufferFormat, aDuration,
                          aChunk.mVolume, aOutputChannels, aOutput);
   } else {
     InterleaveAndConvertBuffer(aChunk.mChannelData.Elements(),
                                aChunk.mBufferFormat, aDuration, aChunk.mVolume,
                                aOutputChannels, aOutput);
   }
 }
 /*static*/
 void
 AudioTrackEncoder::DeInterleaveTrackData(AudioDataValue* aInput,
                                          int32_t aDuration,
                                          int32_t aChannels,
                                          AudioDataValue* aOutput)
 {
   for (int32_t i = 0; i < aChannels; ++i) {
     for(int32_t j = 0; j < aDuration; ++j) {
       aOutput[i * aDuration + j] = aInput[i + j * aChannels];
     }
   }
 }
 void
 VideoTrackEncoder::NotifyQueuedTrackChanges(MediaStreamGraph* aGraph,
                                             TrackID aID,
                                             TrackRate aTrackRate,
                                             TrackTicks aTrackOffset,
                                             uint32_t aTrackEvents,
                                             const MediaSegment& aQueuedMedia)
 {
   if (mCanceled) {
     return;
   }
   const VideoSegment& video = static_cast<const VideoSegment&>(aQueuedMedia);
    // Check and initialize parameters for codec encoder.
   if (!mInitialized) {
 #ifdef PR_LOGGING
     mVideoInitCounter++;
     TRACK_LOG(PR_LOG_DEBUG, ("Init the video encoder %d times", mVideoInitCounter));
 #endif
     VideoSegment::ChunkIterator iter(const_cast<VideoSegment&>(video));
     while (!iter.IsEnded()) {
       VideoChunk chunk = *iter;
       if (!chunk.IsNull()) {
         gfx::IntSize imgsize = chunk.mFrame.GetImage()->GetSize();
         gfxIntSize intrinsicSize = chunk.mFrame.GetIntrinsicSize();
         nsresult rv = Init(imgsize.width, imgsize.height,
                            intrinsicSize.width, intrinsicSize.height,
                            aTrackRate);
         if (NS_FAILED(rv)) {
           LOG("[VideoTrackEncoder]: Fail to initialize the encoder!");
           NotifyCancel();
         }
         break;
       }
       iter.Next();
     }
   }
   AppendVideoSegment(video);
   // The stream has stopped and reached the end of track.
   if (aTrackEvents == MediaStreamListener::TRACK_EVENT_ENDED) {
     LOG("[VideoTrackEncoder]: Receive TRACK_EVENT_ENDED .");
     NotifyEndOfStream();
   }
 }
 nsresult
 VideoTrackEncoder::AppendVideoSegment(const VideoSegment& aSegment)
 {
   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
   // Append all video segments from MediaStreamGraph, including null an
   // non-null frames.
   VideoSegment::ChunkIterator iter(const_cast<VideoSegment&>(aSegment));
   while (!iter.IsEnded()) {
     VideoChunk chunk = *iter;
     nsRefPtr<layers::Image> image = chunk.mFrame.GetImage();
     mRawSegment.AppendFrame(image.forget(), chunk.GetDuration(),
                             chunk.mFrame.GetIntrinsicSize().ToIntSize());
     iter.Next();
   }
   if (mRawSegment.GetDuration() > 0) {
     mReentrantMonitor.NotifyAll();
   }
   return NS_OK;
 }
 void
 VideoTrackEncoder::NotifyEndOfStream()
 {
   // If source video track is muted till the end of encoding, initialize the
   // encoder with default frame width, frame height, and track rate.
   if (!mCanceled && !mInitialized) {
     Init(DEFAULT_FRAME_WIDTH, DEFAULT_FRAME_HEIGHT,
          DEFAULT_FRAME_WIDTH, DEFAULT_FRAME_HEIGHT, DEFAULT_TRACK_RATE);
   }
   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
   mEndOfStream = true;
   mReentrantMonitor.NotifyAll();
 }
 void
 VideoTrackEncoder::CreateMutedFrame(nsTArray<uint8_t>* aOutputBuffer)
 {
   NS_ENSURE_TRUE_VOID(aOutputBuffer);
   // Supports YUV420 image format only.
   int yPlaneLen = mFrameWidth * mFrameHeight;
   int cbcrPlaneLen = yPlaneLen / 2;
   int frameLen = yPlaneLen + cbcrPlaneLen;
   aOutputBuffer->SetLength(frameLen);
   // Fill Y plane.
   memset(aOutputBuffer->Elements(), 0x10, yPlaneLen);
   // Fill Cb/Cr planes.
   memset(aOutputBuffer->Elements() + yPlaneLen, 0x80, cbcrPlaneLen);
 }
 }

The Tor Browser / annotate

content/media/encoder/TrackEncoder.cpp@44a2da4a2ab2 (annotated)

content/media/encoder/TrackEncoder.cpp