Method getFrameData

YUViewLib/src/filesource/FileSourceAnnexBFile.cpp:188–223

}

QByteArray FileSourceAnnexBFile::getFrameData(pairUint64 startEndFilePos)
{
  // Get all data for the frame (all NAL units in the raw format with start codes).
  // We don't need to convert the format to the mp4 ISO format. The ffmpeg decoder can also accept raw NAL units.
  // When the extradata is set as raw NAL units, the AVPackets must also be raw NAL units.
  QByteArray retArray;
  
  auto start = startEndFilePos.first;
  auto end = startEndFilePos.second;

  // Seek the source file to the start position
  this->seek(start);

  // Retrieve NAL units (and repackage them) until we reached out end position
  while (end > this->bufferStartPosInFile + this->posInBuffer)
  {
    auto nalData = getNextNALUnit();

    int headerOffset = 0;
    if (nalData.at(0) == (char)0 && nalData.at(1) == (char)0)
    {
      if (nalData.at(2) == (char)0 && nalData.at(3) == (char)1)
        headerOffset = 4;
      else if (nalData.at(2) == (char)1)
        headerOffset = 3;
    }
    assert(headerOffset > 0);
    if (headerOffset == 3)
      retArray.append((char)0);

    DEBUG_ANNEXBFILE("FileSourceAnnexBFile::getFrameData Load NAL - size " << nalData.length());
    retArray += nalData;
  }

  return retArray;
}

bool FileSourceAnnexBFile::updateBuffer()
{