xaQNXVideoBufferQueueSourceCallback

QNX video buffer queue event-handler prototype

Synopsis:

#include <OMXAL/OpenMAXAL_QNX.h>

typedef XAresult(XAAPIENTRY * xaQNXVideoBufferQueueSourceCallback)
 (XAQNXVideoBufferQueueSourceItf caller,
                void *pCallbackContext,
                void *pBufferContext,
                screen_buffer_t screenBuffer,
                const XAQNXBufferItem *pItems,
                XAuint32 itemsLength);

Arguments:

caller: A reference to the QNX video buffer queue interface
pCallbackContext: An optional pointer to extra data to be used by this event handler. This pointer is NULL if no extra data are provided when registering the function with RegisterCallback().
pBufferContext: A pointer to the buffer context
screenBuffer: A handle to the Screen buffer containing the video data to be processed
pItems: An array of XAQNXBufferItem structures containing information about the individual data items
itemsLength: The number of items in the preceding array

Library:

mmfilter

Description:

This data type provides a prototype for registering a function that handles events related to a buffer in the buffer queue used by the XAQNXVideoBufferQueueSourceItf interface.

The event-handler function accepts input arguments containing a reference to the interface, pointers to the buffer context and optionally, extra data for the event, and a handle to the Screen buffer containing the video data. The input arguments also include metadata describing the buffer and its data items. The function doesn't return anything.