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C++ MediaResource::Seek方法代码示例

本文整理汇总了C++中MediaResource::Seek方法的典型用法代码示例。如果您正苦于以下问题：C++ MediaResource::Seek方法的具体用法？C++ MediaResource::Seek怎么用？C++ MediaResource::Seek使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MediaResource的用法示例。


在下文中一共展示了MediaResource::Seek方法的7个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: SeekData

gboolean GStreamerReader::SeekData(GstAppSrc* aSrc, guint64 aOffset)
{
  aOffset += mDataOffset;

  ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
  MediaResource* resource = mDecoder->GetResource();
  int64_t resourceLength = resource->GetLength();

  if (gst_app_src_get_size(mSource) == -1) {
    /* It's possible that we didn't know the length when we initialized mSource
     * but maybe we do now
     */
    gst_app_src_set_size(mSource, GetDataLength());
  }

  nsresult rv = NS_ERROR_FAILURE;
  if (aOffset < static_cast<guint64>(resourceLength)) {
    rv = resource->Seek(SEEK_SET, aOffset);
  }

  if (NS_FAILED(rv)) {
    LOG(PR_LOG_ERROR, "seek at %lu failed", aOffset);
  } else {
    MOZ_ASSERT(aOffset == static_cast<guint64>(resource->Tell()));
  }

  return NS_SUCCEEDED(rv);
}
开发者ID:msliu，项目名称:gecko-dev，代码行数:28，代码来源:GStreamerReader.cpp

示例2: PlayBinSourceSetup

void GStreamerReader::PlayBinSourceSetup(GstAppSrc* aSource)
{
  mSource = GST_APP_SRC(aSource);
  gst_app_src_set_callbacks(mSource, &mSrcCallbacks, (gpointer) this, nullptr);
  MediaResource* resource = mDecoder->GetResource();

  /* do a short read to trigger a network request so that GetLength() below
   * returns something meaningful and not -1
   */
  char buf[512];
  unsigned int size = 0;
  resource->Read(buf, sizeof(buf), &size);
  resource->Seek(SEEK_SET, 0);

  /* now we should have a length */
  int64_t resourceLength = resource->GetLength();
  gst_app_src_set_size(mSource, resourceLength);
  if (resource->IsDataCachedToEndOfResource(0) ||
      (resourceLength != -1 && resourceLength <= SHORT_FILE_SIZE)) {
    /* let the demuxer work in pull mode for local files (or very short files)
     * so that we get optimal seeking accuracy/performance
     */
    LOG(PR_LOG_DEBUG, ("configuring random access, len %lld", resourceLength));
    gst_app_src_set_stream_type(mSource, GST_APP_STREAM_TYPE_RANDOM_ACCESS);
  } else {
    /* make the demuxer work in push mode so that seeking is kept to a minimum
     */
    LOG(PR_LOG_DEBUG, ("configuring push mode, len %lld", resourceLength));
    gst_app_src_set_stream_type(mSource, GST_APP_STREAM_TYPE_SEEKABLE);
  }
}
开发者ID:KyleBarnhart，项目名称:mozilla-central，代码行数:31，代码来源:GStreamerReader.cpp

示例3: webm_seek

static int webm_seek(int64_t aOffset, int aWhence, void *aUserData)
{
  NS_ASSERTION(aUserData, "aUserData must point to a valid AbstractMediaDecoder");
  AbstractMediaDecoder* decoder = reinterpret_cast<AbstractMediaDecoder*>(aUserData);
  MediaResource* resource = decoder->GetResource();
  NS_ASSERTION(resource, "Decoder has no media resource");
  nsresult rv = resource->Seek(aWhence, aOffset);
  return NS_SUCCEEDED(rv) ? 0 : -1;
}
开发者ID:，项目名称:，代码行数:9，代码来源:

示例4: Seek

nsresult nsRawReader::Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime)
{
  NS_ASSERTION(mDecoder->OnDecodeThread(),
               "Should be on decode thread.");

  MediaResource *resource = mDecoder->GetResource();
  NS_ASSERTION(resource, "Decoder has no media resource");

  uint32_t frame = mCurrentFrame;
  if (aTime >= UINT_MAX)
    return NS_ERROR_FAILURE;
  mCurrentFrame = aTime * mFrameRate / USECS_PER_S;

  CheckedUint32 offset = CheckedUint32(mCurrentFrame) * mFrameSize;
  offset += sizeof(nsRawVideoHeader);
  NS_ENSURE_TRUE(offset.isValid(), NS_ERROR_FAILURE);

  nsresult rv = resource->Seek(nsISeekableStream::NS_SEEK_SET, offset.value());
  NS_ENSURE_SUCCESS(rv, rv);

  mVideoQueue.Erase();

  while(mVideoQueue.GetSize() == 0) {
    bool keyframeSkip = false;
    if (!DecodeVideoFrame(keyframeSkip, 0)) {
      mCurrentFrame = frame;
      return NS_ERROR_FAILURE;
    }

    {
      mozilla::ReentrantMonitorAutoEnter autoMonitor(mDecoder->GetReentrantMonitor());
      if (mDecoder->GetDecodeState() ==
          nsBuiltinDecoderStateMachine::DECODER_STATE_SHUTDOWN) {
        mCurrentFrame = frame;
        return NS_ERROR_FAILURE;
      }
    }

    nsAutoPtr<VideoData> video(mVideoQueue.PeekFront());
    if (video && video->mEndTime < aTime) {
      mVideoQueue.PopFront();
      video = nullptr;
    } else {
      video.forget();
    }
  }

  return NS_OK;
}
开发者ID:Ajunboys，项目名称:mozilla-os2，代码行数:49，代码来源:nsRawReader.cpp

示例5: Read

static bool Read(Decoder *aDecoder, char *aBuffer, int64_t aOffset, uint32_t aCount, uint32_t* aBytes)
{
  MediaResource *resource = GetResource(aDecoder);
  if (aOffset != resource->Tell()) {
    nsresult rv = resource->Seek(nsISeekableStream::NS_SEEK_SET, aOffset);
    if (NS_FAILED(rv)) {
      return false;
    }
  }
  nsresult rv = resource->Read(aBuffer, aCount, aBytes);
  if (NS_FAILED(rv)) {
    return false;
  }
  return true;
}
开发者ID:alessandrod，项目名称:mozilla-central，代码行数:15，代码来源:MediaPluginHost.cpp

示例6: SeekInternal

nsresult RawReader::SeekInternal(int64_t aTime)
{
  NS_ASSERTION(mDecoder->OnDecodeThread(),
               "Should be on decode thread.");

  MediaResource *resource = mDecoder->GetResource();
  NS_ASSERTION(resource, "Decoder has no media resource");

  uint32_t frame = mCurrentFrame;
  if (aTime >= UINT_MAX)
    return NS_ERROR_FAILURE;
  mCurrentFrame = aTime * mFrameRate / USECS_PER_S;

  CheckedUint32 offset = CheckedUint32(mCurrentFrame) * mFrameSize;
  offset += sizeof(RawVideoHeader);
  NS_ENSURE_TRUE(offset.isValid(), NS_ERROR_FAILURE);

  nsresult rv = resource->Seek(nsISeekableStream::NS_SEEK_SET, offset.value());
  NS_ENSURE_SUCCESS(rv, rv);

  mVideoQueue.Reset();

  while(mVideoQueue.GetSize() == 0) {
    bool keyframeSkip = false;
    if (!DecodeVideoFrame(keyframeSkip, 0)) {
      mCurrentFrame = frame;
      return NS_ERROR_FAILURE;
    }

    {
      ReentrantMonitorAutoEnter autoMonitor(mDecoder->GetReentrantMonitor());
      if (mDecoder->IsShutdown()) {
        mCurrentFrame = frame;
        return NS_ERROR_FAILURE;
      }
    }

    if (mVideoQueue.PeekFront() && mVideoQueue.PeekFront()->GetEndTime() < aTime) {
      nsRefPtr<VideoData> releaseMe = mVideoQueue.PopFront();
    }
  }

  return NS_OK;
}
开发者ID:AOSC-Dev，项目名称:Pale-Moon，代码行数:44，代码来源:RawReader.cpp

示例7: SeekData

gboolean nsGStreamerReader::SeekData(GstAppSrc *aSrc, guint64 aOffset)
{
  ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
  MediaResource* resource = mDecoder->GetResource();

  if (gst_app_src_get_size(mSource) == -1)
    /* It's possible that we didn't know the length when we initialized mSource
     * but maybe we do now
     */
    gst_app_src_set_size(mSource, resource->GetLength());

  nsresult rv = NS_ERROR_FAILURE;
  if (aOffset < resource->GetLength())
    rv = resource->Seek(SEEK_SET, aOffset);

  if (NS_SUCCEEDED(rv))
    mByteOffset = mLastReportedByteOffset = aOffset;
  else
    LOG(PR_LOG_ERROR, ("seek at %lu failed", aOffset));

  return NS_SUCCEEDED(rv);
}
开发者ID:chiiph，项目名称:mozilla-central，代码行数:22，代码来源:nsGStreamerReader.cpp


注：本文中的MediaResource::Seek方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。