xaQNXBufferQueueSourceCallback

Updated: October 26, 2022

QNX buffer queue event-handler prototype

Synopsis:

#include <OMXAL/OpenMAXAL_QNX.h>
typedef XAresult(XAAPIENTRY * xaQNXBufferQueueSourceCallback)
           (XAQNXBufferQueueSourceItf caller,
                void *pCallbackContext,
                void *pBufferContext,
                void *pBufferData,
                XAuint32 dataSize,
                XAuint32 dataUsed,
                const XAQNXBufferItem *pItems,
                XAuint32 itemsLength);

Arguments:

caller
A reference to the QNX 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
pBufferData
A pointer to the memory where the data items are stored
dataSize
The total buffer size, in bytes
dataUsed
The number of bytes used for storing all data items
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 XAQNXBufferQueueSourceItf interface.

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