public void PopulateBITMAPINFOHEADER32(ref Win32.BITMAPINFOHEADER bmih)
{
bmih.Init();
bmih.biPlanes = 1;
bmih.biBitCount = 32;
bmih.biHeight = height;
bmih.biWidth = width;
bmih.biSizeImage = (uint)(4 * width * height);
}
public void PopulateWAVEFORMATEX(ref Win32.WAVEFORMATEX wfex)
{
int bytes = 0;
if (a_bits == 16) bytes = 2;
else if (a_bits == 8) bytes = 1;
else throw new InvalidOperationException("only 8/16 bits audio are supported by AviWriter and you chose: " + a_bits);
if (a_channels == 1) { }
else if (a_channels == 2) { }
else throw new InvalidOperationException("only 1/2 channels audio are supported by AviWriter and you chose: " + a_channels);
wfex.Init();
wfex.nBlockAlign = (ushort)(bytes * a_channels);
wfex.nChannels = (ushort)a_channels;
wfex.wBitsPerSample = (ushort)a_bits;
wfex.wFormatTag = Win32.WAVE_FORMAT_PCM;
wfex.nSamplesPerSec = (uint)a_samplerate;
wfex.nAvgBytesPerSec = (uint)(wfex.nBlockAlign * a_samplerate);
}
public void PopulateBITMAPINFOHEADER24(ref Win32.BITMAPINFOHEADER bmih)
{
bmih.Init();
bmih.biPlanes = 1;
bmih.biBitCount = 24;
bmih.biHeight = height;
//pad up width so that we end up with multiple of 4 bytes
pitch = width * 3;
pitch = (pitch + 3) & ~3;
pitch_add = pitch - width * 3;
bmih.biWidth = width;
bmih.biSizeImage = (uint)(pitch * height);
}
