Windows Media Player 11 SDK Removing the Code to Process Greater than 16 Bits 

Removing the Code to Process Greater than 16 Bits

Because this sample only processes 8-bit or 16-bit audio, you need to modify the code in CEcho::ValidateMediaType to return DMO_E_TYPE_NOT_ACCEPTED for media types greater than 16 bits. To accomplish this, you must change the code in the switch block that tests formats of type WAVE_FORMAT_EXTENSIBLE. Replace the wizard code with the following example code:

case WAVE_FORMAT_EXTENSIBLE:
    {
         // Sample size is greater than 16-bit or is multichannel.
        WAVEFORMATEXTENSIBLE *pWaveXT = (WAVEFORMATEXTENSIBLE *) pWave;

        if (KSDATAFORMAT_SUBTYPE_PCM != pWaveXT->SubFormat)
        {
            return DMO_E_TYPE_NOT_ACCEPTED;
        }
    }
    break;

Next, delete or comment out the sections of code in DoProcessOutput that handle high bit resolution audio. These are the sections that begin with case 24 and case 32.

See Also

• Implementing CEcho::DoProcessOutput