static OSStatus ca_capture_conversion_callback(AudioConverterRef inAudioConverter, UInt32 *ioNumberDataPackets,
      AudioBufferList *ioData, AudioStreamPacketDescription **outDataPacketDescription, void* inUserData)
{
   ALCdevice *device = (ALCdevice*)inUserData;
   ca_data *data = (ca_data*)device->ExtraData;

   AL_PRINT("*ioNumberDataPackets: %d\n", *ioNumberDataPackets);

   // Read from the ring buffer directly to the input data buffer
   ReadRingBuffer(data->ring, ioData->mBuffers[0].mData, (ALsizei)(*ioNumberDataPackets));

   // Set the input data
   ioData->mNumberBuffers = 1;
   ioData->mBuffers[0].mNumberChannels = data->format.mChannelsPerFrame;
   ioData->mBuffers[0].mDataByteSize = (*ioNumberDataPackets) * data->format.mBytesPerFrame;

   return noErr;
}


static void ca_capture_samples(ALCdevice *device, ALCvoid *buffer, ALCuint samples)
{
   ca_data *data = (ca_data*)device->ExtraData;

   ALCuint ringBufferSize = (ALCuint)RingBufferSize(data->ring);

   AL_PRINT("samples: %d\n", samples);
   AL_PRINT("ringBufferSize: %d\n", ringBufferSize);

   if(samples <= ringBufferSize && samples != 0)
   {
      UInt32 resampledFrameCount = samples / data->sampleRateRatio;
      AL_PRINT("resampledFrameCount: %d\n", resampledFrameCount);

      // Point the resampling buffer to the capture buffer
      data->resampledBufferList->mBuffers[0].mData = buffer;

      // Resample into another AudioBufferList
      OSStatus err = AudioConverterFillComplexBuffer(data->audioConverter, ca_capture_conversion_callback, device,
            &resampledFrameCount, data->resampledBufferList, NULL);
      if (err)
      {
         AL_PRINT("AudioConverterFillComplexBuffer error: %d\n", err);
         alcSetError(device, ALC_INVALID_VALUE);
         return;
      }
   }
   else
      alcSetError(device, ALC_INVALID_VALUE);
}