| WaveFormatExtensible Fields | 
The WaveFormatExtensible type exposes the following members.
| Name | Description | |
|---|---|---|
| dwChannelMask | 
            Bitmask specifying the assignment of channels in the stream to speaker positions.
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| subFormat | 
            Subformat of the data, such as KSDATAFORMAT_SUBTYPE_PCM. The subformat information is similar to that provided by the tag in the WAVEFORMATEX structure's wFormatTag member.
              | |
| wValidBitsPerSample | 
            Number of bits of precision in the signal. Usually equal to WAVEFORMATEX.wBitsPerSample or wSamplesPerBlock if wBitsPerSample==0
              |