private MFSourceReader Initialize(MFSourceReader reader)
{
MediaFoundationCore.Startup();
try
{
reader.SetStreamSelection(MFInterops.MF_SOURCE_READER_ALL_STREAMS, false);
reader.SetStreamSelection(MFInterops.MF_SOURCE_READER_FIRST_AUDIO_STREAM, true);
using (var mediaType = MFMediaType.CreateEmpty())
{
mediaType.MajorType = MediaTypes.MediaTypeAudio;
mediaType.SubType = MediaTypes.MEDIATYPE_Pcm; //variable??
reader.SetCurrentMediaType(MFInterops.MF_SOURCE_READER_FIRST_AUDIO_STREAM, mediaType);
}
using (var currentMediaType = reader.GetCurrentMediaType(MFInterops.MF_SOURCE_READER_FIRST_AUDIO_STREAM))
{
if (currentMediaType.MajorType != MediaTypes.MediaTypeAudio)
{
throw new InvalidOperationException(String.Format("Invalid Majortype set on sourcereader: {0}.", currentMediaType.MajorType.ToString()));
}
AudioEncoding encoding;
if (currentMediaType.SubType == MediaTypes.MEDIATYPE_Pcm)
{
encoding = AudioEncoding.Pcm;
}
else if (currentMediaType.SubType == MediaTypes.MEDIATYPE_IeeeFloat)
{
encoding = AudioEncoding.IeeeFloat;
}
else
{
throw new InvalidOperationException(String.Format("Invalid Subtype set on sourcereader: {0}.", currentMediaType.SubType.ToString()));
}
_waveFormat = new WaveFormat(currentMediaType.SampleRate, currentMediaType.BitsPerSample, currentMediaType.Channels, encoding);
}
reader.SetStreamSelection(MFInterops.MF_SOURCE_READER_FIRST_AUDIO_STREAM, true);
if (_hasFixedLength)
{
_length = GetLength(reader);
}
return(reader);
}
catch (Exception)
{
Dispose();
throw;
}
}
public MediaFoundationDecoder(string url)
{
if (String.IsNullOrEmpty(url))
{
throw new ArgumentNullException("filename");
}
_hasFixedLength = true;
MediaFoundationCore.Startup();
_reader = Initialize(MediaFoundationCore.CreateSourceReaderFromUrl(url));
}
public static MFMediaType FromWaveFormat(WaveFormat waveFormat)
{
MediaFoundationCore.Startup();
return(MediaFoundationCore.MediaTypeFromWaveFormat(waveFormat));
}
public static MFMediaType CreateEmpty()
{
MediaFoundationCore.Startup();
return(MediaFoundationCore.CreateMediaType());
}
static MediaFoundationEncoder()
{
MediaFoundationCore.Startup();
}
static MediaFoundationDecoder()
{
MediaFoundationCore.Startup(); //make sure that the MediaFoundation is started up.
}
private MFSourceReader Initialize(IMFByteStream stream)
{
MediaFoundationCore.Startup();
return(Initialize(MediaFoundationCore.CreateSourceReaderFromByteStream(stream, IntPtr.Zero)));
}