public VideoStrech(int aviFile, IntPtr aviStream)
{
this.aviFile = aviFile;
this.aviStream = aviStream;
Avi32.BITMAPINFOHEADER bih = new Avi32.BITMAPINFOHEADER();
int size = Marshal.SizeOf(bih);
Avi32.AVIStreamReadFormat(aviStream, 0, ref bih, ref size);
Avi32.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream);
this.bitMaps = new List<Bitmap>();
this.frameRate = (float)streamInfo.dwRate / (float)streamInfo.dwScale;
this.width = (int)streamInfo.rcFrame.right;
this.height = (int)streamInfo.rcFrame.bottom;
this.frameSize = bih.biSizeImage;
this.firstFrame = Avi32.AVIStreamStart(aviStream.ToInt32());
this.position = streamInfo.dwStart;
this.start = streamInfo.dwStart;
this.length = streamInfo.dwLength;
this.codec = Avi32.decode_mmioFOURCC(streamInfo.fccHandler);
}
private void SetFormat(IntPtr aviStream)
{
Avi32.BITMAPINFOHEADER bi = new Avi32.BITMAPINFOHEADER();
bi.biSize = Marshal.SizeOf(bi);
bi.biWidth = width;
bi.biHeight = height;
bi.biPlanes = 1;
bi.biBitCount = countBitsPerPixel;
bi.biSizeImage = frameSize;
int result = Avi32.AVIStreamSetFormat(aviStream, 0, ref bi, bi.biSize);
if (result != 0) { throw new Exception("Error in VideoStreamSetFormat: " + result.ToString()); }
}
public Bitmap GetSubsequentPosition(int framePosition)
{
IntPtr dib = Avi32.AVIStreamGetFrame(new IntPtr(getFrameObject), framePosition);
Avi32.BITMAPINFOHEADER bih = new Avi32.BITMAPINFOHEADER();
bih = (Avi32.BITMAPINFOHEADER)Marshal.PtrToStructure(dib, bih.GetType());
Bitmap bmp = new Bitmap(this.width, this.height, PixelFormat.Format24bppRgb);
BitmapData bmData = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int srcStride = bmData.Stride;
int dstStride = bmData.Stride;
int dst = bmData.Scan0.ToInt32() + dstStride * (height - 1);
int src = dib.ToInt32() + Marshal.SizeOf(typeof(Avi32.BITMAPINFOHEADER));
for (int y = 0; y < height; y++)
{
Avi32.memcpy(dst, src, srcStride);
dst -= dstStride;
src += srcStride;
}
bmp.UnlockBits(bmData);
return bmp;
}
