C++ VideoFrameContainer::ClearCurrentFrame方法代码示例

// Resets all state related to decoding, emptying all buffers etc.
nsresult nsMediaOmxReader::ResetDecode()
{
  nsBuiltinDecoderReader::ResetDecode();

  VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
  if (container) {
    container->ClearCurrentFrame();
  }
  return NS_OK;
}

nsresult AndroidMediaReader::ReadMetadata(MediaInfo* aInfo,
                                          MetadataTags** aTags)
{
  MOZ_ASSERT(OnTaskQueue());

  if (!mPlugin) {
    mPlugin = GetAndroidMediaPluginHost()->CreateDecoder(mDecoder->GetResource(), mType);
    if (!mPlugin) {
      return NS_ERROR_FAILURE;
    }
  }

  // Set the total duration (the max of the audio and video track).
  int64_t durationUs;
  mPlugin->GetDuration(mPlugin, &durationUs);
  if (durationUs) {
    mInfo.mMetadataDuration.emplace(TimeUnit::FromMicroseconds(durationUs));
  }

  if (mPlugin->HasVideo(mPlugin)) {
    int32_t width, height;
    mPlugin->GetVideoParameters(mPlugin, &width, &height);
    nsIntRect pictureRect(0, 0, width, height);

    // Validate the container-reported frame and pictureRect sizes. This ensures
    // that our video frame creation code doesn't overflow.
    nsIntSize displaySize(width, height);
    nsIntSize frameSize(width, height);
    if (!IsValidVideoRegion(frameSize, pictureRect, displaySize)) {
      return NS_ERROR_FAILURE;
    }

    // Video track's frame sizes will not overflow. Activate the video track.
    mHasVideo = true;
    mInfo.mVideo.mDisplay = displaySize;
    mPicture = pictureRect;
    mInitialFrame = frameSize;
    VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
    if (container) {
      container->ClearCurrentFrame(IntSize(displaySize.width, displaySize.height));
    }
  }

  if (mPlugin->HasAudio(mPlugin)) {
    int32_t numChannels, sampleRate;
    mPlugin->GetAudioParameters(mPlugin, &numChannels, &sampleRate);
    mHasAudio = true;
    mInfo.mAudio.mChannels = numChannels;
    mInfo.mAudio.mRate = sampleRate;
  }

 *aInfo = mInfo;
 *aTags = nullptr;
  return NS_OK;
}

void
CameraPreviewMediaStream::ClearCurrentFrame()
{
    MutexAutoLock lock(mMutex);

    for (nsTArray<RefPtr<VideoFrameContainer> >::size_type i = 0; i < mVideoOutputs.Length(); ++i) {
        VideoFrameContainer* output = mVideoOutputs[i];
        output->ClearCurrentFrame();
        NS_DispatchToMainThread(NewRunnableMethod(output, &VideoFrameContainer::Invalidate));
    }
}

void MP4Reader::ReleaseMediaResources()
{
  // Before freeing a video codec, all video buffers needed to be released
  // even from graphics pipeline.
  VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
  if (container) {
    container->ClearCurrentFrame();
  }
  if (mVideo.mDecoder) {
    mVideo.mDecoder->ReleaseMediaResources();
  }
}

void MediaOmxReader::ReleaseMediaResources()
{
  mMediaResourceRequest.DisconnectIfExists();
  mMetadataPromise.RejectIfExists(ReadMetadataFailureReason::METADATA_ERROR, __func__);

  ResetDecode();
  // Before freeing a video codec, all video buffers needed to be released
  // even from graphics pipeline.
  VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
  if (container) {
    container->ClearCurrentFrame();
  }
  if (mOmxDecoder.get()) {
    mOmxDecoder->ReleaseMediaResources();
  }
}

// Resets all state related to decoding, emptying all buffers etc.
nsresult MediaOmxReader::ResetDecode()
{
  MediaDecoderReader::ResetDecode();

  VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
  if (container) {
    container->ClearCurrentFrame();
  }

  if (mLastVideoFrame) {
    delete mLastVideoFrame;
    mLastVideoFrame = nullptr;
  }
  if (mOmxDecoder) {
    delete mOmxDecoder;
    mOmxDecoder = nullptr;
  }
  return NS_OK;
}

void MediaOmxReader::HandleResourceAllocated()
{
  EnsureActive();

  // After resources are available, set the metadata.
  if (!mOmxDecoder->EnsureMetadata()) {
    mMetadataPromise.Reject(ReadMetadataFailureReason::METADATA_ERROR, __func__);
    return;
  }

  bool isMP3 = mDecoder->GetResource()->GetContentType().EqualsASCII(AUDIO_MP3);
  if (isMP3 && mMP3FrameParser.IsMP3()) {
    // Check if the MP3 frame parser found a duration.
    mLastParserDuration = mMP3FrameParser.GetDuration();
  }

  if (mLastParserDuration >= 0) {
    // Prefer the parser duration if we have it.
    mInfo.mMetadataDuration = Some(TimeUnit::FromMicroseconds(mLastParserDuration));
  } else {
    // MP3 parser failed to find a duration.
    // Set the total duration (the max of the audio and video track).
    int64_t durationUs;
    mOmxDecoder->GetDuration(&durationUs);
    if (durationUs) {
      mInfo.mMetadataDuration = Some(TimeUnit::FromMicroseconds(durationUs));
    }
  }

  if (mOmxDecoder->HasVideo()) {
    int32_t displayWidth, displayHeight, width, height;
    mOmxDecoder->GetVideoParameters(&displayWidth, &displayHeight,
                                    &width, &height);
    nsIntRect pictureRect(0, 0, width, height);

    // Validate the container-reported frame and pictureRect sizes. This ensures
    // that our video frame creation code doesn't overflow.
    nsIntSize displaySize(displayWidth, displayHeight);
    nsIntSize frameSize(width, height);
    if (!IsValidVideoRegion(frameSize, pictureRect, displaySize)) {
      mMetadataPromise.Reject(ReadMetadataFailureReason::METADATA_ERROR, __func__);
      return;
    }

    // Video track's frame sizes will not overflow. Activate the video track.
    mHasVideo = true;
    mInfo.mVideo.mDisplay = displaySize;
    mPicture = pictureRect;
    mInitialFrame = frameSize;
    VideoFrameContainer* container = mDecoder->GetVideoFrameContainer();
    if (container) {
      container->ClearCurrentFrame(gfxIntSize(displaySize.width, displaySize.height));
    }
  }

  if (mOmxDecoder->HasAudio()) {
    int32_t numChannels, sampleRate;
    mOmxDecoder->GetAudioParameters(&numChannels, &sampleRate);
    mHasAudio = true;
    mInfo.mAudio.mChannels = numChannels;
    mInfo.mAudio.mRate = sampleRate;
  }

  nsRefPtr<MetadataHolder> metadata = new MetadataHolder();
  metadata->mInfo = mInfo;
  metadata->mTags = nullptr;

#ifdef MOZ_AUDIO_OFFLOAD
  CheckAudioOffload();
#endif

  mMetadataPromise.Resolve(metadata, __func__);
}