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我无法在iPhone实验中获得声音输出,并且我的想法已经消失。AudioQueue不会输出任何声音
这里是我的回调使用下面的代码片断
// Create stream description
AudioStreamBasicDescription streamDescription;
streamDescription.mSampleRate = 44100;
streamDescription.mFormatID = kAudioFormatLinearPCM;
streamDescription.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
streamDescription.mBytesPerPacket = 1024;
streamDescription.mFramesPerPacket = 1024/4;
streamDescription.mBytesPerFrame = 2 * sizeof(short);
streamDescription.mChannelsPerFrame = 2;
streamDescription.mBitsPerChannel = 16;
AudioQueueNewOutput(&streamDescription, AudioOutputCallback, theEmu, NULL, NULL, 0, &theAudioQueue);
OSStatus errorCode = AudioQueueAllocateBuffer(theAudioQueue, 1024, &someBuffer);
if(errorCode)
{
NSLog(@"Cannot allocate buffer");
}
AudioOutputCallback(theEmu, theAudioQueue, someBuffer);
AudioQueueSetParameter(theAudioQueue, kAudioQueueParam_Volume, 1.0);
AudioQueueStart(theAudioQueue, NULL);
我使用的是输出线性PCM 16bit的44hz库,填补了音频队列缓冲区
void AudioOutputCallback(void *user, AudioQueueRef refQueue, AudioQueueBufferRef inBuffer)
{
NSLog(@"callback called");
inBuffer->mAudioDataByteSize = 1024;
gme_play((Music_Emu*)user, 1024, (short *)inBuffer->mAudioData);
AudioQueueEnqueueBuffer(refQueue, inBuffer, 0, NULL);
}
我设置音频队列。