OpenSL callback methods on queues

[James Moore]

I'm confused about the opensl callback methods on buffer queues. The sample code specifies a callback like this:

    // get the buffer queue interface

    result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_BUFFERQUEUE,

            &bqPlayerBufferQueue);

    assert(SL_RESULT_SUCCESS == result);

    // register callback on the buffer queue

    result = (*bqPlayerBufferQueue)->RegisterCallback(bqPlayerBufferQueue, bqPlayerCallback, NULL);

    assert(SL_RESULT_SUCCESS == result);

Where bqPlayerCallback is:

  void bqPlayerCallback(SLAndroidSimpleBufferQueueItf bq, void *context)

But the opensl spec says that buffer queue callbacks look like:

void BufferQueueCallback(

SLBufferQueueItf queueItf,

SLuint32 eventFlags,

const void * pBuffer,

SLuint32 bufferSize,

SLuint32 dataUsed,

void *pContext)

What am I missing? 

[Glenn Kasten]

You're probably looking at OpenSL ES 1.1, which is incompatible with OpenSL ES 1.0.1 in this area.

The Android implementation is based on OpenSL ES 1.0.1. 

After installing NDK, open NDKroot/docs/opensles/index.html in browser and look at these sections:

 Planning for source compatibility, bullet 1

 Android simple buffer queue data locator and interface

For convenience, a copy of the 1.0.1 spec is included in that same directory. There's also example code in NDK that uses the 1.0.1 version of the API.

[James Moore]

On Wednesday, August 8, 2012 8:44:55 AM UTC-7, Glenn Kasten wrote:

You're probably looking at OpenSL ES 1.1, which is incompatible with OpenSL ES 1.0.1 in this area.

Yes, that was the problem, and looking at the right spec did clear up a bunch of my questions.  Thanks!

 - James