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POHow to use AudioQueue to play a sound for Mac OSX in C++
 

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  1. POHow to use AudioQueue to play a sound for Mac OSX in C++
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    <p>I am trying to play a sound on OSX, from a buffer (eg: Equivalent of Windows "PlaySound" function).</p> <p>I have put together some C++ code to play audio with AudioQueue (as it is my understanding that this is the easiest way to play audio on OSX).</p> <p>However, no sound is ever generated, and the audio callback function is never called.</p> <p>Does anybody know what I'm doing wrong, or does anyone have a simple C/C++ example of how to play a sound on OSX?</p> <pre><code> #include #include #define BUFFER_COUNT 3 static struct AQPlayerState { AudioStreamBasicDescription desc; AudioQueueRef queue; AudioQueueBufferRef buffers[BUFFER_COUNT]; unsigned buffer_size; } state; static void audio_callback (void *aux, AudioQueueRef aq, AudioQueueBufferRef bufout) { printf("I never get called!\n"); #define nsamples 4096 short data[nsamples]; for (int i=0;imAudioDataByteSize = nsamples * sizeof(short) * 1; assert(bufout->mAudioDataByteSize mAudioData, data, bufout->mAudioDataByteSize); AudioQueueEnqueueBuffer(state.queue, bufout, 0, NULL); } void audio_init() { int i; bzero(&state, sizeof(state)); state.desc.mFormatID = kAudioFormatLinearPCM; state.desc.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; state.desc.mSampleRate = 44100; state.desc.mChannelsPerFrame = 1; state.desc.mFramesPerPacket = 1; state.desc.mBytesPerFrame = sizeof (short) * state.desc.mChannelsPerFrame; state.desc.mBytesPerPacket = state.desc.mBytesPerFrame; state.desc.mBitsPerChannel = (state.desc.mBytesPerFrame*8)/state.desc.mChannelsPerFrame; state.desc.mReserved = 0; state.buffer_size = state.desc.mBytesPerFrame * state.desc.mSampleRate; if (noErr != AudioQueueNewOutput(&state.desc, audio_callback, 0, NULL, NULL, 0, &state.queue)) { printf("audioqueue error\n"); return; } // Start some empty playback so we'll get the callbacks that fill in the actual audio. for (i = 0; i mAudioDataByteSize = state.buffer_size; AudioQueueEnqueueBuffer(state.queue, state.buffers[i], 0, NULL); } if (noErr != AudioQueueStart(state.queue, NULL)) printf("AudioQueueStart failed\n"); printf("started audio\n"); } int main() { audio_init(); while (1) { printf("I can't hear anything!\n"); } } </code></pre>
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