The QNX additions to the OpenMAX AL interface let you extract, transcode, play, and record audio and video content. Your applications can write raw or encoded content to buffer queues to send it to the underlying media engine for processing, and read content after it's been processed by the media engine (from different buffer queues) and then direct it to the output.
The functionality for reading and writing buffers and handling buffer events is defined in three interfaces that aren't part of the standard specification from the Khronos Group. The XAQNXBufferQueueSourceItf interface provides functions for writing buffers containing audio or video data items to an OpenMAX source, and for defining a callback to handle buffer events. The XAQNXVideoBufferQueueSourceItf interface provides similar functionality for writing buffers containing video data generated by the Screen Graphics Subsystem. Finally, the XAQNXBufferQueueSinkItf interface lets applications read the media data sent to an OpenMAX sink as well as information about the data formatting.
The QNX-extended API also supports logging.