我使用下面的代码来初始化我的音频组件。
-(void) startListeningWithCoreAudio
{
NSError *error = nil;
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayAndRecord error:&error];
if (error)
NSLog(@"error setting up audio session: %@", [error localizedDescription]);
[[AVAudioSession sharedInstance] setDelegate:self];
OSStatus status = AudioSessionSetActive(YES);
checkStatus(status);
// Find the apple mic
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_VoiceProcessingIO;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
AudioComponent inputComponent = AudioComponentFindNext( NULL, &desc );
status = AudioComponentInstanceNew( inputComponent, &kAudioUnit );
checkStatus( status );
// enable mic output as our input
UInt32 flag = 1;
status = AudioUnitSetProperty( kAudioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, kInputBus, &flag, sizeof(flag) );
checkStatus(status);
// Define mic output audio format
AudioStreamBasicDescription audioFormat;
audioFormat.mSampleRate = 16000.0;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
status = AudioUnitSetProperty( kAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &audioFormat, sizeof(audioFormat) );
checkStatus(status);
// Define our callback methods
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty( kAudioUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, kInputBus, &callbackStruct, sizeof(callbackStruct) );
checkStatus(status);
// By pass voice processing
UInt32 audiobypassProcessing = [[NSUserDefaults standardUserDefaults] boolForKey:VOICE_BY_PASS_PROCESSING];
status = AudioUnitSetProperty(kAudioUnit, kAUVoiceIOProperty_BypassVoiceProcessing,
kAudioUnitScope_Global, kInputBus, &audiobypassProcessing, sizeof(audiobypassProcessing));
checkStatus(status);
// Automatic Gain Control
UInt32 audioAGC = [[NSUserDefaults standardUserDefaults]boolForKey:VOICE_AGC];
status = AudioUnitSetProperty(kAudioUnit, kAUVoiceIOProperty_VoiceProcessingEnableAGC,
kAudioUnitScope_Global, kInputBus, &audioAGC, sizeof(audioAGC));
checkStatus(status);
//Non Audio Voice Ducking
UInt32 audioDucking = [[NSUserDefaults standardUserDefaults]boolForKey:VOICE_DUCKING];
status = AudioUnitSetProperty(kAudioUnit, kAUVoiceIOProperty_DuckNonVoiceAudio,
kAudioUnitScope_Global, kInputBus, &audioDucking, sizeof(audioDucking));
checkStatus(status);
//Audio Quality
UInt32 quality = [[NSUserDefaults standardUserDefaults]integerForKey:VOICE_QUALITY];
status = AudioUnitSetProperty(kAudioUnit, kAUVoiceIOProperty_VoiceProcessingQuality,
kAudioUnitScope_Global, kInputBus, &quality, sizeof(quality));
checkStatus(status);
status = AudioUnitInitialize(kAudioUnit);
checkStatus(status);
status = AudioOutputUnitStart( kAudioUnit );
checkStatus(status);
UInt32 audioRoute = (UInt32)kAudioSessionOverrideAudioRoute_Speaker;
status = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof (audioRoute), &audioRoute);
checkStatus(status);
}
-(void) stopListeningWithCoreAudio
{
OSStatus status = AudioUnitUninitialize( kAudioUnit );
checkStatus(status);
status = AudioOutputUnitStop( kAudioUnit );
checkStatus( status );
// if(kAudioUnit)
// {
// status = AudioComponentInstanceDispose(kAudioUnit);
// checkStatus(status);
// kAudioUnit = nil;
// }
status = AudioSessionSetActive(NO);
checkStatus(status);
NSError *error = nil;
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategorySoloAmbient error:&error];
if (error)
NSLog(@"error setting up audio session: %@", [error localizedDescription]);
}
它第一次工作正常。我的意思是startListeningWithCoreAudio
是由一个按下按钮的事件调用的。它可以很好地记录/处理音频。在其他事件中,我调用stopListeningWithCoreAudio
来停止录制/处理音频。
当我再次尝试调用函数startListeningWithCoreAudio
时,问题来了。它为两个函数抛出错误。从startListeningWithCoreAudio
调用的AudioUnitInitialize
和AudioOutputUnitStart
。
有谁能帮我出什么问题吗?
发布于 2012-06-05 17:27:42
我找到了解决方案。如果我们连续调用下面的函数,就会产生问题。
extern OSStatus AudioUnitUninitialize(AudioUnit inUnit)
extern OSStatus AudioComponentInstanceDispose(AudioComponentInstance inInstance)
因此,我通过下面的方式调用了主线程上的dispose方法。
[self performSelectorOnMainThread:@selector(disposeCoreAudio) withObject:nil waitUntilDone:NO];
-(void) disposeCoreAudio
{
OSStatus status = AudioComponentInstanceDispose(kAudioUnit);
kAudioUnit = nil;
}
它解决了问题。因此,正确的顺序是停止记录,取消初始化记录器,并在主线程上配置记录器。
发布于 2012-05-16 02:42:20
一个可能的问题是,您的代码试图在停止正在运行的音频单元之前将其取消初始化。
https://stackoverflow.com/questions/10599694
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