You can control the audio portion of a capture operation in three ways:
- Include or exclude audio from the capture operation.
- Request a specific number of audio buffers.
- Request that audio buffers be a specific size.
You can retrieve the settings for audio buffers by using the WM_CAP_GET_SEQUENCE_SETUP
message (or the capCaptureGetSetup
macro). The fCaptureAudio
member of the CAPTUREPARMS
structure specifies whether audio is included or excluded from the capture
operation. The current requested number of audio buffers is stored in the wNumAudioRequested
member, and the current audio buffer size is stored in the dwAudioBufferSize
member. You can specify whether to include audio capture, specify the size
and number of audio buffers by updating these members, and send the updated CAPTUREPARMS
structure to the capture window by using the WM_CAP_SET_SEQUENCE_SETUP
message (or the capCaptureSetSetup
By default, audio is included in the capture operation, and four audio buffers
are allocated. The default value of fCaptureAudio
is TRUE. The default buffer size (the value of dwAudioBufferSize
) can contain 0.5 seconds of audio data or 10K, whichever is greater.
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