void IAviStreamWriteHandler.WriteStreamFormat(AviVideoStream videoStream)
{
fileWriter.Write(40U); // size of structure
fileWriter.Write(videoStream.Width);
fileWriter.Write(videoStream.Height);
fileWriter.Write((short)1); // planes
fileWriter.Write((ushort)videoStream.BitsPerPixel); // bits per pixel
fileWriter.Write((uint)videoStream.Codec); // compression (codec FOURCC)
var sizeInBytes = videoStream.Width * videoStream.Height * (((int)videoStream.BitsPerPixel) / 8);
fileWriter.Write((uint)sizeInBytes); // image size in bytes
fileWriter.Write(0); // X pixels per meter
fileWriter.Write(0); // Y pixels per meter
// Writing grayscale palette for 8-bit uncompressed stream
// Otherwise, no palette
if (videoStream.BitsPerPixel == BitsPerPixel.Bpp8 && videoStream.Codec == KnownFourCC.Codecs.Uncompressed)
{
fileWriter.Write(256U); // palette colors used
fileWriter.Write(0U); // palette colors important
for (int i = 0; i < 256; i++)
{
fileWriter.Write((byte)i);
fileWriter.Write((byte)i);
fileWriter.Write((byte)i);
fileWriter.Write((byte)0);
}
}
else
{
fileWriter.Write(0U); // palette colors used
fileWriter.Write(0U); // palette colors important
}
}
public IAviVideoStream AddEncodingVideoStream(IVideoEncoder encoder, int width, int height, bool ownsEncoder)
{
return(AddStream <IAviVideoStreamInternal>(index =>
{
var stream = new AviVideoStream(index, this, width, height, BitsPerPixel.Bpp32);
var encodingStream = new EncodingVideoStreamWrapper(stream, encoder, ownsEncoder);
var asyncStream = new AsyncVideoStreamWrapper(encodingStream);
return asyncStream;
}));
}
void IAviStreamWriteHandler.WriteStreamHeader(AviVideoStream videoStream)
{
// See AVISTREAMHEADER structure
fileWriter.Write((uint)videoStream.StreamType);
fileWriter.Write((uint)videoStream.Codec);
fileWriter.Write(0U); // StreamHeaderFlags
fileWriter.Write((ushort)0); // priority
fileWriter.Write((ushort)0); // language
fileWriter.Write(0U); // initial frames
fileWriter.Write(frameRateDenominator); // scale (frame rate denominator)
fileWriter.Write(frameRateNumerator); // rate (frame rate numerator)
fileWriter.Write(0U); // start
fileWriter.Write((uint)streamsInfo[videoStream.Index].FrameCount); // length
fileWriter.Write((uint)streamsInfo[videoStream.Index].MaxChunkDataSize); // suggested buffer size
fileWriter.Write(0U); // quality
fileWriter.Write(0U); // sample size
fileWriter.Write((short)0); // rectangle left
fileWriter.Write((short)0); // rectangle top
short right = (short)(videoStream != null ? videoStream.Width : 0);
short bottom = (short)(videoStream != null ? videoStream.Height : 0);
fileWriter.Write(right); // rectangle right
fileWriter.Write(bottom); // rectangle bottom
}
void IAviStreamWriteHandler.WriteVideoFrame(AviVideoStream stream, bool isKeyFrame, byte[] frameData, int startIndex, int count)
{
WriteStreamFrame(stream, isKeyFrame, frameData, startIndex, count);
}
