xaQNXVideoBufferQueueSourceCallback

Updated: May 06, 2022

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.