/// <summary>
/// This method reads the video Data/headers from the file and creates a buffer.
/// The buffer is added to the '_videoMemoryStreams' Dictionary so it can be used at one of the FFmpeg callback methods.
/// </summary>
/// <param name="dataPacket">Contains the frame Data.</param>
/// <param name="headerPacket">Contains the header Data, when null, dataPacket is used as headersource.</param>
/// <returns></returns>
private bool PacketDataToBuffer(IResultNode dataPacket, IResultNode headerPacket)
{
// Find current codec detector in packet
ICodecDetector codecDetector = (ICodecDetector)dataPacket.Detectors.Where(d => d is ICodecDetector).FirstOrDefault();
if (codecDetector == null)
{
return(false);
}
// Resolve frame header info
IDataPacket videoHeaders = codecDetector.GetVideoHeaders(headerPacket);
IDataPacket videoData = codecDetector.GetVideoData(dataPacket);
if (videoData == null)
{
return(false);
}
// Copy all the Data, both header- and framedata, to a buffer.
byte[] dataBuf = ReadDataPacket(videoData);
if (IsH264NalUnitResult(dataPacket))
{
// Automatically convert H.264 'NAL unit stream' to 'byte stream', because FFmpeg
// does not support the 'NAL unit stream' format.
dataBuf = ConvertH264NalUnitStreamVideoDataToByteStream(dataBuf);
}
if (videoHeaders != null)
{
byte[] headerData = ReadDataPacket(videoHeaders);
if (IsH264NalUnitResult(headerPacket))
{
// Automatically convert H.264 'NAL unit stream' to 'byte stream', because FFmpeg
// does not support the 'NAL unit stream' format.
headerData = ConvertH264NalUnitStreamHeaderDataToByteStream(headerData);
}
dataBuf = headerData.Concat(dataBuf).ToArray();
}
// Put the Data in a memory stream, used by FFmpeg to read the 'file' from memory.
lock (_videoMemoryStreams)
{
_convertId = _nextConvertId;
_nextConvertId++;
_videoMemoryStreams.Add(_convertId, new MemoryStream(dataBuf));
}
return(true);
}
private void AddKeyFramesToList(IResultNode node, KeyFrameList keyFrames)
{
if (node.IsKeyframe())
{
ICodecDetector detector = node.Detectors.Where(d => d is ICodecDetector).SingleOrDefault() as ICodecDetector;
keyFrames.Add(new KeyFrame(BuildRangeList(detector.GetVideoHeaders(node)), BuildRangeList(detector.GetVideoData(node))));
}
else
{
foreach (var childNode in node.Children)
{
AddKeyFramesToList(childNode, keyFrames);
}
}
}
public IDataPacket GetVideoData(IResultNode resultNode)
{
return(_codecDetector.GetVideoData(resultNode));
}
