/// <summary>Initialize a new VideoStream and add the first frame</summary>
/// <param name="aviFile">The file that contains the stream</param>
/// <param name="writeCompressed">true: create a compressed stream before adding frames</param>
/// <param name="frameRate">Frames per second</param>
/// <param name="firstFrame">Image to write into the stream as the first frame</param>
public VideoStream(int aviFile, Avi.AVICOMPRESSOPTIONS compressOptions, double frameRate, Bitmap firstFrame)
{
Initialize(aviFile, true, frameRate, firstFrame);
CreateStream(compressOptions);
AddFrame(firstFrame);
}
/// <summary>Create a new stream</summary>
private void CreateStream(Avi.AVICOMPRESSOPTIONS options)
{
CreateStreamWithoutFormat();
CreateCompressedStream(options);
}
/// <summary>Create a compressed stream from an uncompressed stream</summary>
private void CreateCompressedStream(Avi.AVICOMPRESSOPTIONS options)
{
int result = Avi.AVIMakeCompressedStream(out compressedStream, aviStream, ref options, 0);
if (result != 0) {
throw new Exception("Exception in AVIMakeCompressedStream: " + result.ToString());
}
this.compressOptions = options;
SetFormat(compressedStream);
}
/// <summary>Copy all properties from one VideoStream to another one</summary>
/// <remarks>Used by EditableVideoStream</remarks>
/// <param name="frameSize"></param><param name="frameRate"></param>
/// <param name="width"></param><param name="height"></param>
/// <param name="countBitsPerPixel"></param>
/// <param name="countFrames"></param><param name="compressOptions"></param>
internal VideoStream(int frameSize, double frameRate, int width, int height, Int16 countBitsPerPixel, int countFrames, Avi.AVICOMPRESSOPTIONS compressOptions, bool writeCompressed)
{
this.frameSize = frameSize;
this.frameRate = frameRate;
this.width = width;
this.height = height;
this.countBitsPerPixel = countBitsPerPixel;
this.countFrames = countFrames;
this.compressOptions = compressOptions;
this.writeCompressed = writeCompressed;
this.firstFrame = 0;
}
/// <summary>Returns all data needed to copy the stream</summary>
/// <remarks>Do not forget to call Marshal.FreeHGlobal and release the raw data pointer</remarks>
/// <param name="streamInfo">Receives the header information</param>
/// <param name="format">Receives the format</param>
/// <param name="streamLength">Receives the length of the stream</param>
/// <returns>Pointer to the wave data</returns>
public IntPtr GetStreamData(ref Avi.AVISTREAMINFO streamInfo, ref Avi.PCMWAVEFORMAT format, ref int streamLength)
{
streamInfo = GetStreamInfo();
format = GetFormat();
//length in bytes = length in samples * length of a sample
streamLength = Avi.AVIStreamLength(aviStream.ToInt32()) * streamInfo.dwSampleSize;
IntPtr waveData = Marshal.AllocHGlobal(streamLength);
int result = Avi.AVIStreamRead(aviStream, 0, streamLength, waveData, streamLength, 0, 0);
if(result != 0){
throw new Exception("Exception in AVIStreamRead: "+result.ToString());
}
return waveData;
}
/// <summary>Change the AviStreamInfo values and update the frame rate</summary>
/// <param name="info"></param>
public void SetInfo(Avi.AVISTREAMINFO info)
{
int result = Avi.EditStreamSetInfo(editableStream, ref info, Marshal.SizeOf(info));
if (result != 0) {
throw new Exception("Exception in SetInfo: " + result.ToString());
}
frameRate = info.dwRate / info.dwScale;
}
