AVICap Callback Functions - Win32 Multimedia Programmer's Reference

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AVICap Callback Functions

Your application can register callback functions with a capture window to have it notify your application when the status changes, when errors occur, when video frame and audio buffers become available, and to yield during streaming capture. The following messages set the callback function.

Message	Description
WM_CAP_SET_CALLBACK_CAPCONTROL	Specifies the callback function in the application called to give precise control over capture start and end. You can also use the capSetCallbackOnCapControl macro to send this message.
WM_CAP_SET_CALLBACK_ERROR	Specifies the callback function in the application called when an error occurs. You can also use the capSetCallbackOnError macro to send this message.
WM_CAP_SET_CALLBACK_FRAME	Specifies the callback function in the application called when preview frames are captured. You can also use the capSetCallbackOnFrame macro to send this message.
WM_CAP_SET_CALLBACK_STATUS	Specifies the callback function in the application called when the status changes. You can also use the capSetCallbackOnStatus macro to send this message.
WM_CAP_SET_CALLBACK_VIDEOSTREAM	Specifies the callback function in the application called during streaming capture when a new video buffer becomes available. You can also use the capSetCallbackOnVideoStream macro to send this message.
WM_CAP_SET_CALLBACK_WAVESTREAM	Specifies the callback function in the application called during streaming capture when a new audio buffer becomes available. You can also use the capSetCallbackOnWaveStream macro to send this message.
WM_CAP_SET_CALLBACK_YIELD	Specifies the callback function in the application called when yielding during streaming capture. You can also use the capSetCallbackOnYield macro to send this message.

The following topics describe the different callback functions, the notifications sent to the functions, and their uses.

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