Function newAudioQueue

driver_darwin.go:35–70

(sampleRate, channelCount int, oneBufferSizeInBytes int)

)

func newAudioQueue(sampleRate, channelCount int, oneBufferSizeInBytes int) (_AudioQueueRef, []_AudioQueueBufferRef, error) {
	desc := _AudioStreamBasicDescription{
		mSampleRate:       float64(sampleRate),
		mFormatID:         uint32(kAudioFormatLinearPCM),
		mFormatFlags:      uint32(kAudioFormatFlagIsFloat),
		mBytesPerPacket:   uint32(channelCount * float32SizeInBytes),
		mFramesPerPacket:  1,
		mBytesPerFrame:    uint32(channelCount * float32SizeInBytes),
		mChannelsPerFrame: uint32(channelCount),
		mBitsPerChannel:   uint32(8 * float32SizeInBytes),
	}

	var audioQueue _AudioQueueRef
	if osstatus := _AudioQueueNewOutput(
		&desc,
		render,
		nil,
		0, //CFRunLoopRef
		0, //CFStringRef
		0,
		&audioQueue); osstatus != noErr {
		return 0, nil, fmt.Errorf("oto: AudioQueueNewFormat with StreamFormat failed: %d", osstatus)
	}

	bufs := make([]_AudioQueueBufferRef, 0, bufferCount)
	for len(bufs) < cap(bufs) {
		var buf _AudioQueueBufferRef
		if osstatus := _AudioQueueAllocateBuffer(audioQueue, uint32(oneBufferSizeInBytes), &buf); osstatus != noErr {
			return 0, nil, fmt.Errorf("oto: AudioQueueAllocateBuffer failed: %d", osstatus)
		}
		buf.mAudioDataByteSize = uint32(oneBufferSizeInBytes)
		bufs = append(bufs, buf)
	}

	return audioQueue, bufs, nil
}

type context struct {
	audioQueue      _AudioQueueRef