Exemplos de MediaResource::ReadAt em C++ (Cpp)

Exemplo n.º 1

Arquivo: GStreamerReader.cpp Projeto: msliu/gecko-dev

/**
 * If this stream is an MP3, we want to parse the headers to estimate the
 * stream duration.
 */
nsresult GStreamerReader::ParseMP3Headers()
{
  MediaResource *resource = mDecoder->GetResource();

  const uint32_t MAX_READ_BYTES = 4096;

  uint64_t offset = 0;
  char bytes[MAX_READ_BYTES];
  uint32_t bytesRead;
  do {
    nsresult rv = resource->ReadAt(offset, bytes, MAX_READ_BYTES, &bytesRead);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_TRUE(bytesRead, NS_ERROR_FAILURE);

    mMP3FrameParser.Parse(bytes, bytesRead, offset);
    offset += bytesRead;
  } while (!mMP3FrameParser.ParsedHeaders());

  if (mMP3FrameParser.IsMP3()) {
    mLastParserDuration = mMP3FrameParser.GetDuration();
    mDataOffset = mMP3FrameParser.GetMP3Offset();

    // Update GStreamer's stream length in case we found any ID3 headers to
    // ignore.
    gst_app_src_set_size(mSource, GetDataLength());
  }

  return NS_OK;
}

Exemplo n.º 2

Arquivo: GStreamerReader.cpp Projeto: jryans/gecko-dev

/**
 * If this stream is an MP3, we want to parse the headers to estimate the
 * stream duration.
 */
nsresult GStreamerReader::ParseMP3Headers()
{
    MediaResource *resource = mDecoder->GetResource();

    const uint32_t MAX_READ_BYTES = 4096;

    uint64_t offset = 0;
    char bytes[MAX_READ_BYTES];
    uint32_t bytesRead;
    do {
        nsresult rv = resource->ReadAt(offset, bytes, MAX_READ_BYTES, &bytesRead);
        NS_ENSURE_SUCCESS(rv, rv);
        NS_ENSURE_TRUE(bytesRead, NS_ERROR_FAILURE);

        mMP3FrameParser.Parse(bytes, bytesRead, offset);
        offset += bytesRead;
    } while (!mMP3FrameParser.ParsedHeaders());

    if (mMP3FrameParser.IsMP3()) {
        mLastParserDuration = mMP3FrameParser.GetDuration();
    }

    return NS_OK;
}