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static voidclear_AudioStreamBasicDescription (AudioStreamBasicDescription *desc){  desc->mSampleRate = 0;  desc->mFormatID = 0;  desc->mFormatFlags = 0;  desc->mBytesPerPacket = 0;  desc->mFramesPerPacket = 0;  desc->mBytesPerFrame = 0;  desc->mChannelsPerFrame = 0;  desc->mBitsPerChannel = 0;}static voidfill_indesc_mp3 (MacOSXAudioDecoder * macosx, guint32 fourcc, gint rate, gint channels){  GST_LOG ("...");  clear_AudioStreamBasicDescription (&macosx->indesc);  /* only the samplerate is needed apparently */  macosx->indesc.mSampleRate = rate;  macosx->indesc.mFormatID = kAudioFormatMPEGLayer3;  macosx->indesc.mChannelsPerFrame = channels;}[.....]static gbooleanopen_decoder (MacOSXAudioDecoder * macosx, GstCaps * caps, GstCaps **othercaps){ ....  fill_indesc_mp3 (macosx, oclass->componentSubType, rate, channels);  /* Setup the output format description */  macosx->outdesc.mSampleRate = rate;  macosx->outdesc.mFormatID = kAudioFormatLinearPCM;  macosx->outdesc.mFormatFlags = kAudioFormatFlagIsFloat;  macosx->outdesc.mBytesPerPacket = channels * 4;		/* ?? */  macosx->outdesc.mFramesPerPacket = 1;  macosx->outdesc.mBytesPerFrame = channels * 4;/* channels * bytes-per-samples*/  macosx->outdesc.mChannelsPerFrame = channels;  macosx->outdesc.mBitsPerChannel = 32;  /* Create an AudioConverter */  status = AudioConverterNew (&macosx->indesc,			      &macosx->outdesc,			      &macosx->aconv);  if (status != noErr) {    GST_WARNING_OBJECT (macosx, "Error when calling AudioConverterNew() : %ld",			status);    goto beach;  }}static OSStatusprocess_buffer_cb (AudioConverterRef inAudioConverter, UInt32* ioDataSize, 		   void** outData, MacOSXAudioDecoder *macosx){  gint len;  GST_LOG_OBJECT (macosx, "ioDataSize:%d",		  *ioDataSize);  len = MIN (gst_adapter_available (macosx->adapter), *ioDataSize);  if (len) {    *outData = gst_adapter_take (macosx->adapter, len);  }  *ioDataSize = len;  GST_LOG_OBJECT (macosx, "returning %d bytes at %p",		  len, *outData);  return noErr;}chain(){    /* 4. Create buffer and copy data in it */    ret = gst_pad_alloc_buffer (macosx->srcpad, macosx->cur_offset,				outbytes, GST_PAD_CAPS (macosx->srcpad),				&outbuf);    if (ret != GST_FLOW_OK)      goto beach;    GST_LOG_OBJECT (macosx, "Calling FillBuffer(outbytes:%d , outdata:%p)",		    outbytes, GST_BUFFER_DATA (outbuf));    /* Ask AudioConverter to give us data ! */    oserr = AudioConverterFillBuffer (macosx->aconv,				      (AudioConverterInputDataProc) process_buffer_cb,				      macosx,				      &outbytes,				      &GST_BUFFER_DATA (outbuf));    if (oserr != noErr) {      GST_WARNING_OBJECT (macosx, "Error in AudioConverterFillBuffer() : %d",			  oserr);      ret = GST_FLOW_ERROR;      gst_buffer_unref (outbuf);      goto beach;    }    GST_LOG_OBJECT (macosx, "We now have %d bytes",		    outbytes);}