在我的iOS应用程序中，我使用AudioQueue进行音频录制和播放，基本上我有OSX版本运行并将其移植到iOS上。
我意识到在iOS中我需要配置/设置AV会话，我已经做了以下直到现在，
-(void)initAudioSession{
//get your app's audioSession singleton object
AVAudioSession* session = [AVAudioSession sharedInstance];
//error handling
BOOL success;
NSError* error;
//set the audioSession category.
//Needs to be Record or PlayAndRecord to use audioRouteOverride:
success = [session setCategory:AVAudioSessionCategoryPlayAndRecord
error:&error];
if (!success) NSLog(@"AVAudioSession error setting category:%@",error);
//set the audioSession override
success = [session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker
error:&error];
if (!success) NSLog(@"AVAudioSession error overrideOutputAudioPort:%@",error);
//activate the audio session
success = [session setActive:YES error:&error];
if (!success) NSLog(@"AVAudioSession error activating: %@",error);
else NSLog(@"audioSession active");
}
现在发生的事情是，扬声器AudioQueue回调从未被调用，我检查了许多答案，评论，谷歌等…看起来是正确的，我做的方法是
- 为输入和输出创建AudioQueue:配置线性PCM, 16000采样率
- 分配缓冲区
- 设置有效回调队列，
- 启动队列，
似乎很好，我可以听到另一端的输出(即输入AudioQueue正在工作)，但输出AudioQueue(即AudioQueueOutputCallback从未被调用)。
我怀疑我需要设置适当的avsessioncategory，我正在尝试所有可能的选项，但无法听到扬声器中的任何声音，
我比较我的实现与苹果的例子Speakhere在主线程上运行AudioQueue。
即使我不启动输入AudioQueue(麦克风)，然后我也同样的行为。并且很难有Speakhere行为，即停止录制并播放
谢谢你看它，期待你的评论/帮助。将能够共享代码片段。
谢谢你看它，我意识到问题，这是我的回调，
void AudioStream::AQBufferCallback(void * inUserData,
AudioQueueRef inAQ,
AudioQueueBufferRef inCompleteAQBuffer)
{
AudioStream *THIS = (AudioStream *)inUserData;
if (THIS->mIsDone) {
return;
}
if ( !THIS->IsRunning()){
NSLog(@" AudioQueue is not running");
**return;** // Error part
}
int bytes = THIS->bufferByteSize;
if ( !THIS->pSingleBuffer){
THIS->pSingleBuffer = new unsigned char[bytes];
}
unsigned char *buffer = THIS->pSingleBuffer;
if ((THIS->mNumPacketsToRead) > 0) {
/* lets read only firt packet */
memset(buffer,0x00,bytes);
float volume = THIS->volume();
if (THIS->volumeChange){
SInt16 *editBuffer = (SInt16 *)buffer;
// loop over every packet
for (int nb = 0; nb < (sizeof(buffer) / 2); nb++) {
// we check if the gain has been modified to save resoures
if (volume != 0) {
// we need more accuracy in our calculation so we calculate with doubles
double gainSample = ((double)editBuffer[nb]) / 32767.0;
/*
at this point we multiply with our gain factor
we dont make a addition to prevent generation of sound where no sound is.
no noise
0*10=0
noise if zero
0+10=10
*/
gainSample *= volume;
/**
our signal range cant be higher or lesser -1.0/1.0
we prevent that the signal got outside our range
*/
gainSample = (gainSample < -1.0) ? -1.0 : (gainSample > 1.0) ? 1.0 : gainSample;
/*
This thing here is a little helper to shape our incoming wave.
The sound gets pretty warm and better and the noise is reduced a lot.
Feel free to outcomment this line and here again.
You can see here what happens here http://silentmatt.com/javascript-function-plotter/
Copy this to the command line and hit enter: plot y=(1.5*x)-0.5*x*x*x
*/
gainSample = (1.5 * gainSample) - 0.5 * gainSample * gainSample * gainSample;
// multiply the new signal back to short
gainSample = gainSample * 32767.0;
// write calculate sample back to the buffer
editBuffer[nb] = (SInt16)gainSample;
}
}
}
else{
// NSLog(@" No change in the volume");
}
memcpy(inCompleteAQBuffer->mAudioData, buffer, 640);
inCompleteAQBuffer->mAudioDataByteSize = 640;
inCompleteAQBuffer->mPacketDescriptionCount = 320;
show_err(AudioQueueEnqueueBuffer(inAQ, inCompleteAQBuffer, 0, NULL));
}
}
因为我在分配时没有排队，我相信它在开始之前必须排队几个缓冲区，删除返回部分解决了我的问题。