public AcmEncoder GetEncoder()
{
bool encoderNeeded;
SoundFormat inputFormat = GetInputFormat(out encoderNeeded);
if (!encoderNeeded) {
return null;
}
AcmEncoder encoder = new AcmEncoder();
encoder.InputFormat = inputFormat;
encoder.OutputFormat = this.format;
return encoder;
}
public void Open(string fileName, DisplayFormat videoFormat, int fps, VideoCompressor compressor,
SoundFormat audioFormat, AcmEncoder audioEncoder)
{
if (this.opened) {
throw new InvalidOperationException();
}
if (string.IsNullOrEmpty(fileName)) {
throw new ArgumentNullException("fileName");
}
this.video = videoFormat != null;
this.audio = audioFormat != null;
if (!this.audio && !this.video) {
// There is nothing to do!
throw new InvalidOperationException();
}
// Open AVI File
int hr = Avi32Interop.AVIFileOpen(out this.pAviFile, fileName, Avi32Interop.OF_CREATE, IntPtr.Zero);
if (hr != 0) {
throw new AviException("AVIFileOpen", hr);
}
try {
if (this.video) {
this.SetupVideo(videoFormat, compressor, fps);
}
if (this.audio) {
this.SetupAudio(audioFormat, audioEncoder);
}
this.opened = true;
}
finally {
if (!this.opened) {
this.Close();
}
}
}
private void SetupAudio(SoundFormat audioFormat, AcmEncoder audioEncoder)
{
IntPtr pwfx = audioFormat.ToPtr();
try {
Avi32Interop.AVISTREAMINFO asi = new Avi32Interop.AVISTREAMINFO();
asi.fccType = Avi32Interop.streamtypeAUDIO;
asi.dwScale = audioFormat.BlockAlign;
asi.dwRate = audioFormat.AverageBytesPerSecond;
asi.dwStart = 0;
asi.dwLength = -1;
asi.dwInitialFrames = 0;
asi.dwSuggestedBufferSize = 0;
asi.dwQuality = -1;
asi.dwSampleSize = audioFormat.BlockAlign;
int hr = Avi32Interop.AVIFileCreateStream(this.pAviFile, out this.pAudioStream, ref asi);
if (hr != 0) {
throw new AviException("AVIStreamSetFormat", hr);
}
hr = Avi32Interop.AVIStreamSetFormat(this.pAudioStream, 0, pwfx, audioFormat.ToalSize);
if (hr != 0) {
throw new AviException("AVIStreamSetFormat", hr);
}
if (audioEncoder != null) {
audioEncoder.Open();
}
this.audioFormat = audioFormat;
this.audioEncoder = audioEncoder;
}
finally {
Marshal.FreeHGlobal(pwfx);
}
}
public void Close()
{
if (this.pAviCompressedStream != IntPtr.Zero) {
Avi32Interop.AVIStreamRelease(this.pAviCompressedStream);
this.pAviCompressedStream = IntPtr.Zero;
}
if (this.pVideoStream != IntPtr.Zero) {
Avi32Interop.AVIStreamRelease(this.pVideoStream);
this.pVideoStream = IntPtr.Zero;
}
if (this.pAudioStream != IntPtr.Zero) {
Avi32Interop.AVIStreamRelease(this.pAudioStream);
this.pAudioStream = IntPtr.Zero;
}
if (this.audioEncoder != null) {
this.audioEncoder.Close();
this.audioEncoder = null;
}
if (this.pAviFile != IntPtr.Zero) {
Avi32Interop.AVIFileRelease(this.pAviFile);
this.pAviFile = IntPtr.Zero;
}
this.opened = false;
}