Extra Bytes (Windows CE 5.0)

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The cbSize member in a WAVEFORMATEX structure must contain the number of extra bytes allocated for the WAVEFORMATEX structure. Given that the only mandatory extra field passed to the ACM codec is the **wSamplesPerBlock****member, this value must always be at least 2.

In order for the ACM codec to function with VoIP, the following restrictions must be followed:

• The cbSize member can be any value from 0 to 16. However, it cannot be greater than 16.
• The VoIP code does not examine the additional fields for WAVEFORMATEX and initializes them to 0 when opening the ACM codec. Values for these fields cannot be specified by an OEM.

See Also

Pluggable Codec Requirements

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