how to encode/decode speex with AudioQueue in ios

If anyone have some experience that encode/decode speex audio format with AudioQueue?

I have tried to implement it by editing the SpeakHere sample. But not success!

From the apple API document, AudioQueue can support codec, but I can't found any sample. Could anyone give me some suggestion? I already compiled speex codec successfully in my project in XCode 4.

Solution

in the apple sample code "SpeakHere" you can do some thing like this:

AudioQueueNewInput(
                                     &mRecordFormat,
                                     MyInputBufferHandler,
                                     this /* userData */,
                                     NULL /* run loop */,
                                     NULL /* run loop mode */,
                                     0 /* flags */, &mQueue)

you can do some thing in function "MyInputBufferHandler" like

[self encoder:(short *)buffer->mAudioData count:buffer->mAudioDataByteSize/sizeof(short)];

the encoder function like:

while ( count >= samplesPerFrame )
    {
        speex_bits_reset( &bits );

        speex_encode_int( enc_state, samples, &bits ); 

        static const unsigned maxSize = 256;
        char data[maxSize];
        unsigned size = (unsigned)speex_bits_write( &bits, data, maxSize );
        /*
                    do some thing... for example :send to server
        */

        samples += samplesPerFrame;
        count -= samplesPerFrame;
    }

This is the general idea.Of course fact is hard, but you can see some open source of VOIP, maybe can help you. good luck.