/// <summary>
/// Gets all the available media types for a particular
/// </summary>
/// <param name="audioSubtype">Audio subtype - a value from the AudioSubtypes class</param>
/// <returns>An array of available media types that can be encoded with this subtype</returns>
public static MediaType[] GetOutputMediaTypes(Guid audioSubtype)
{
IMFCollection availableTypes;
try
{
MediaFoundationInterop.MFTranscodeGetAudioOutputAvailableTypes(
audioSubtype, _MFT_ENUM_FLAG.MFT_ENUM_FLAG_ALL, null, out availableTypes);
}
catch (COMException c)
{
if (c.GetHResult() == MediaFoundationErrors.MF_E_NOT_FOUND)
{
// Don't worry if we didn't find any - just means no encoder available for this type
return(new MediaType[0]);
}
else
{
throw;
}
}
availableTypes.GetElementCount(out int count);
var mediaTypes = new List <MediaType>(count);
for (int n = 0; n < count; n++)
{
availableTypes.GetElement(n, out object mediaTypeObject);
var mediaType = (IMFMediaType)mediaTypeObject;
mediaTypes.Add(new MediaType(mediaType));
}
Marshal.ReleaseComObject(availableTypes);
return(mediaTypes.ToArray());
}
/// <summary>
/// Gets all the available media types for a particular
/// </summary>
/// <param name="audioSubtype">Audio subtype - a value from the AudioSubtypes class</param>
/// <returns>An array of available media types that can be encoded with this subtype</returns>
// Token: 0x0600093B RID: 2363 RVA: 0x0001AB68 File Offset: 0x00018D68
public static MediaType[] GetOutputMediaTypes(Guid audioSubtype)
{
IMFCollection imfcollection;
try
{
MediaFoundationInterop.MFTranscodeGetAudioOutputAvailableTypes(audioSubtype, _MFT_ENUM_FLAG.MFT_ENUM_FLAG_ALL, null, out imfcollection);
}
catch (COMException exception)
{
if (exception.GetHResult() == -1072875819)
{
return(new MediaType[0]);
}
throw;
}
int num;
imfcollection.GetElementCount(out num);
List <MediaType> list = new List <MediaType>(num);
for (int i = 0; i < num; i++)
{
object obj;
imfcollection.GetElement(i, out obj);
IMFMediaType mediaType = (IMFMediaType)obj;
list.Add(new MediaType(mediaType));
}
Marshal.ReleaseComObject(imfcollection);
return(list.ToArray());
}
public static int[] GetEncodeBitrates(Guid audioSubtype, int sampleRate, int channels)
{
var bitRates = new HashSet <int>();
IMFCollection availableTypes;
MediaFoundationInterop.MFTranscodeGetAudioOutputAvailableTypes(
audioSubtype, _MFT_ENUM_FLAG.MFT_ENUM_FLAG_ALL, null, out availableTypes);
int count;
availableTypes.GetElementCount(out count);
for (int n = 0; n < count; n++)
{
object mediaTypeObject;
availableTypes.GetElement(n, out mediaTypeObject);
var mediaType = (IMFMediaType)mediaTypeObject;
// filter out types that are for the wrong sample rate and channels
int samplesPerSecond;
mediaType.GetUINT32(MediaFoundationAttributes.MF_MT_AUDIO_SAMPLES_PER_SECOND, out samplesPerSecond);
if (sampleRate != samplesPerSecond)
{
continue;
}
int channelCount;
mediaType.GetUINT32(MediaFoundationAttributes.MF_MT_AUDIO_NUM_CHANNELS, out channelCount);
if (channels != channelCount)
{
continue;
}
int bytesPerSecond;
mediaType.GetUINT32(MediaFoundationAttributes.MF_MT_AUDIO_AVG_BYTES_PER_SECOND, out bytesPerSecond);
bitRates.Add(bytesPerSecond * 8);
Marshal.ReleaseComObject(mediaType);
}
Marshal.ReleaseComObject(availableTypes);
return(bitRates.ToArray());
}
