public bool ReadFrame(out byte[] frame)
{
frame = null;
byte[] sourceFrame;
if (!m_source.ReadFrame(out sourceFrame))
{
return(false);
}
frame = new byte[FrameSize];
fixed(AVPicture *pOutPict = &m_outPict)
fixed(byte *pOrig = sourceFrame)
{
AVPicture sourcePict;
int size = FFmpeg.avpicture_fill(out sourcePict, sourceFrame, m_source.PixelFormat, m_source.Width, m_source.Height);
Debug.Assert(size == sourceFrame.Length);
if (FFmpeg.sws_scale(m_scalingContext, (byte **)&sourcePict.data[0], sourcePict.linesize, 0, m_source.Height,
(byte **)&pOutPict->data[0], pOutPict->linesize) < 0)
{
throw new DecoderException("Error scaling output");
}
// copy data into our managed buffer
if (pOutPict->data[0] == null)
{
frame = null;
return(true);
}
if (FFmpeg.avpicture_layout((AVPicture *)pOutPict, PixelFormat, Width, Height, frame, frame.Length) < 0)
{
throw new DecoderException("Error copying decoded frame into managed memory");
}
}
return(true);
}
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
if (m_stream != null)
{
byte[] frame;
if (m_stream.ReadFrame(out frame))
{
Bitmap image = new Bitmap(m_stream.Width, m_stream.Height);
BitmapData data = image.LockBits(new Rectangle(0, 0, image.Width, image.Height),
ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);
Marshal.Copy(frame, 0, data.Scan0, frame.Length);
image.UnlockBits(data);
pe.Graphics.DrawImage(image, ClientRectangle);
}
}
}
