/// <summary>Adds a new frame to the AVI stream</summary>
/// <param name="bmp">The image to add</param>
public void AddFrame(Bitmap bmp)
{
bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
BitmapData bmpDat = bmp.LockBits(
new Rectangle(0, 0, bmp.Width, bmp.Height),
ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
if (countFrames == 0)
{
//this is the first frame - get size and create a new stream
this.stride = (UInt32)bmpDat.Stride;
this.width = bmp.Width;
this.height = bmp.Height;
CreateStream();
}
int result = Avi.AVIStreamWrite(aviStream,
countFrames, 1,
bmpDat.Scan0, //pointer to the beginning of the image data
(Int32)(stride * height),
0, 0, 0);
if (result != 0)
{
throw new Exception("Error in AVIStreamWrite: " + result.ToString());
}
bmp.UnlockBits(bmpDat);
countFrames++;
}
/// <summary>Closes stream, file and AVI library</summary>
public void Close()
{
if (aviStream != IntPtr.Zero)
{
Avi.AVIStreamRelease(aviStream);
aviStream = IntPtr.Zero;
}
if (aviFile != 0)
{
Avi.AVIFileRelease(aviFile);
aviFile = 0;
}
Avi.AVIFileExit();
Started = false;
}
/// <summary>Creates a new AVI file</summary>
/// <param name="fileName">Name of the new AVI file</param>
/// <param name="frameRate">Frames per second</param>
/// <param name="width">Width</param><param name="height">Height</param>
public void Open(string fileName, UInt32 frameRate)
{
this.frameRate = frameRate;
Avi.AVIFileInit();
int hr = Avi.AVIFileOpen(
ref aviFile, fileName,
4097 /* OF_WRITE | OF_CREATE (winbase.h) */, 0);
if (hr != 0)
{
throw new Exception("Error in AVIFileOpen: " + hr.ToString());
}
Started = true;
}
/// <summary>Creates a new video stream in the AVI file</summary>
private void CreateStream()
{
Avi.AVISTREAMINFO strhdr = new Avi.AVISTREAMINFO();
strhdr.fccType = fccType;
strhdr.fccHandler = fccHandler;
strhdr.dwScale = 1;
strhdr.dwRate = frameRate;
strhdr.dwSuggestedBufferSize = (UInt32)(height * stride);
strhdr.dwQuality = 10000; //highest quality! Compression destroys the hidden message
strhdr.rcFrame.bottom = (UInt32)height;
strhdr.rcFrame.right = (UInt32)width;
strhdr.szName = new UInt16[64];
int result = Avi.AVIFileCreateStream(aviFile, out aviStream, ref strhdr);
if (result != 0)
{
throw new Exception("Error in AVIFileCreateStream: " + result.ToString());
}
//define the image format
Avi.BITMAPINFOHEADER bi = new Avi.BITMAPINFOHEADER();
bi.biSize = (UInt32)Marshal.SizeOf(bi);
bi.biWidth = (Int32)width;
bi.biHeight = (Int32)height;
bi.biPlanes = 1;
bi.biBitCount = 24;
bi.biSizeImage = (UInt32)(stride * height);
result = Avi.AVIStreamSetFormat(aviStream, 0, ref bi, Marshal.SizeOf(bi));
if (result != 0)
{
throw new Exception("Error in AVIStreamSetFormat: " + result.ToString());
}
}
