/// <summary>
/// Creates a MediaType based on a given WaveFormat. Don't forget to call Free() for the returend MediaType.
/// </summary>
/// <param name="waveFormat">WaveFormat to create a MediaType from.</param>
/// <returns>Dmo MediaType</returns>
public static MediaType FromWaveFormat(WaveFormat waveFormat)
{
if (waveFormat == null)
{
throw new ArgumentNullException("waveFormat");
}
MediaType mediaType = new MediaType();
NativeMethods.MoInitMediaType(ref mediaType, Marshal.SizeOf(waveFormat));
mediaType.MajorType = MediaTypes.MediaTypeAudio;
mediaType.SubType = WaveFormatExtensible.SubTypeFromWaveFormat(waveFormat);
mediaType.FixedSizeSamples = (mediaType.SubType == MediaTypes.MEDIATYPE_IeeeFloat || mediaType.SubType == MediaTypes.MEDIATYPE_Pcm) ? 1 : 0;
mediaType.FormatType = FORMAT_WaveFormatEx;
IntPtr hWaveFormat = Marshal.AllocHGlobal(Marshal.SizeOf(waveFormat));
Marshal.StructureToPtr(waveFormat, hWaveFormat, false);
if (hWaveFormat == IntPtr.Zero)
{
throw new InvalidOperationException("hWaveFormat == IntPtr.Zero");
}
if (mediaType.CbFormat < Marshal.SizeOf(waveFormat))
{
throw new InvalidOperationException("No memory for Format reserved");
}
mediaType.PtrFormat = hWaveFormat;
return(mediaType);
}
internal WaveFormat BuildOutputWaveFormat(IAudioSource audioSource)
{
if (audioSource == null)
{
throw new ArgumentNullException("source");
}
return(new WaveFormatExtensible(
audioSource.WaveFormat.SampleRate,
audioSource.WaveFormat.BitsPerSample,
OutputChannelCount,
WaveFormatExtensible.SubTypeFromWaveFormat(audioSource.WaveFormat),
OutputMask));
}
private static WaveFormat GetOutputWaveFormat(IWaveSource source, int sampleRate, ChannelMatrix channelMatrix)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (channelMatrix == null)
{
throw new ArgumentNullException("channelMatrix");
}
return(new WaveFormatExtensible(
sampleRate,
source.WaveFormat.BitsPerSample,
channelMatrix.OutputChannelCount,
WaveFormatExtensible.SubTypeFromWaveFormat(source.WaveFormat),
channelMatrix.OutputMask));
}
/// <summary>
/// Initializes a new instance of the <see cref="DmoChannelResampler"/> class.
/// </summary>
/// <param name="source">Underlying source which has to get resampled.</param>
/// <param name="channelMatrix"><see cref="ChannelMatrix" /> which defines how to map each channel.</param>
/// <param name="outputFormat">Waveformat, which specifies the new format. Note, that by far not all formats are supported.</param>
/// <exception cref="System.ArgumentNullException">
/// source
/// or
/// channelMatrix
/// or
/// outputFormat
/// </exception>
/// <exception cref="System.ArgumentException">The number of channels of the source has to be equal to the number of input channels specified by the channelMatrix.</exception>
public DmoChannelResampler(IWaveSource source, ChannelMatrix channelMatrix, WaveFormat outputFormat)
: base(source, outputFormat)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (channelMatrix == null)
{
throw new ArgumentNullException("channelMatrix");
}
if (outputFormat == null)
{
throw new ArgumentNullException("outputFormat");
}
if (source.WaveFormat.Channels != channelMatrix.InputChannelCount)
{
throw new ArgumentException(
"The number of channels of the source has to be equal to the number of input channels specified by the channelMatrix.");
}
var inputFormat = new WaveFormatExtensible(
source.WaveFormat.SampleRate,
source.WaveFormat.BitsPerSample,
source.WaveFormat.Channels,
WaveFormatExtensible.SubTypeFromWaveFormat(source.WaveFormat),
channelMatrix.InputMask);
Outputformat = new WaveFormatExtensible(
outputFormat.SampleRate,
outputFormat.BitsPerSample,
outputFormat.Channels,
WaveFormatExtensible.SubTypeFromWaveFormat(outputFormat),
channelMatrix.OutputMask);
Initialize(inputFormat, Outputformat);
_channelMatrix = channelMatrix;
CommitChannelMatrixChanges();
}
public DmoChannelResampler(IWaveSource source, ChannelMatrix channelMatrix, int destSampleRate)
: base(source, destSampleRate)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (channelMatrix == null)
{
throw new ArgumentNullException("channelMatrix");
}
if (source.WaveFormat.Channels != channelMatrix.InputChannelCount)
{
throw new ArgumentException("source.WaveFormat.Channels != channelMatrix.InputChannelCount");
}
WaveFormatExtensible inputformat = new WaveFormatExtensible(source.WaveFormat.SampleRate, source.WaveFormat.BitsPerSample,
source.WaveFormat.Channels, WaveFormatExtensible.SubTypeFromWaveFormat(source.WaveFormat), _channelMatrix.InputMask);
_outputformat = new WaveFormat(destSampleRate, source.WaveFormat.BitsPerSample, 6, source.WaveFormat.WaveFormatTag, source.WaveFormat.ExtraSize);
WaveFormatExtensible outputformat = new WaveFormatExtensible(_outputformat.SampleRate, _outputformat.BitsPerSample,
_outputformat.Channels, WaveFormatExtensible.SubTypeFromWaveFormat(_outputformat), _channelMatrix.OutputMask);
Init(inputformat, outputformat);
_resampler.ResamplerProps.SetUserChannelMtx(_channelMatrix.GetMatrix());
}