+ // 2. Create Resampler Transform Object
+
+ CoCreateInstance( CLSID_CResamplerMediaObject, NULL, CLSCTX_INPROC_SERVER,
+ IID_IUnknown, ( void** ) &_transformUnk );
+
+ _transformUnk->QueryInterface( IID_PPV_ARGS( &_transform ) );
+
+ _transformUnk->QueryInterface( IID_PPV_ARGS( &_resamplerProps ) );
+ _resamplerProps->SetHalfFilterLength( 60 ); // best conversion quality
+
+ // 3. Specify input / output format
+
+ MFCreateMediaType( &_mediaType );
+ _mediaType->SetGUID( MF_MT_MAJOR_TYPE, MFMediaType_Audio );
+ _mediaType->SetGUID( MF_MT_SUBTYPE, isFloat ? MFAudioFormat_Float : MFAudioFormat_PCM );
+ _mediaType->SetUINT32( MF_MT_AUDIO_NUM_CHANNELS, channelCount );
+ _mediaType->SetUINT32( MF_MT_AUDIO_SAMPLES_PER_SECOND, inSampleRate );
+ _mediaType->SetUINT32( MF_MT_AUDIO_BLOCK_ALIGNMENT, _bytesPerSample * channelCount );
+ _mediaType->SetUINT32( MF_MT_AUDIO_AVG_BYTES_PER_SECOND, _bytesPerSample * channelCount * inSampleRate );
+ _mediaType->SetUINT32( MF_MT_AUDIO_BITS_PER_SAMPLE, bitsPerSample );
+ _mediaType->SetUINT32( MF_MT_ALL_SAMPLES_INDEPENDENT, TRUE );
+
+ MFCreateMediaType( &_inputMediaType );
+ _mediaType->CopyAllItems( _inputMediaType );
+
+ _transform->SetInputType( 0, _inputMediaType, 0 );
+
+ MFCreateMediaType( &_outputMediaType );
+ _mediaType->CopyAllItems( _outputMediaType );
+
+ _outputMediaType->SetUINT32( MF_MT_AUDIO_SAMPLES_PER_SECOND, outSampleRate );
+ _outputMediaType->SetUINT32( MF_MT_AUDIO_AVG_BYTES_PER_SECOND, _bytesPerSample * channelCount * outSampleRate );
+
+ _transform->SetOutputType( 0, _outputMediaType, 0 );
+
+ // 4. Send stream start messages to Resampler
+
+ _transform->ProcessMessage( MFT_MESSAGE_COMMAND_FLUSH, NULL );
+ _transform->ProcessMessage( MFT_MESSAGE_NOTIFY_BEGIN_STREAMING, NULL );
+ _transform->ProcessMessage( MFT_MESSAGE_NOTIFY_START_OF_STREAM, NULL );