iOS录音后播放声音小,AudioSessionInitialize failed,AudioQueueStart failed (-50)

时间:2023-01-27 16:36:18
方法1:
UInt32 audioRoute = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRoute), &audioRoute);
方法2:
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
 
解决AudioSessionInitialize fail 用(dispatch_once_t)
解决AudioQueueStart failed (-50)
AudioSessionInitialize可以被多次执行,但AudioSessionInterruptionListener只能被设置一次,
这就意味着这个打断回调方法是一个静态方法,一旦初始化成功以后所有的打断都会回调到这个方法,
即便下一次再次调用AudioSessionInitialize并且把另一个静态方法作为参数传入,当打断到来时还是会回调到第一次设置的方法上。
 
这种场景并不少见,例如你的app既需要播放歌曲又需要录音,当然你不可能知道用户会先调用哪个功能,
所以你必须在播放和录音的模块中都调用AudioSessionInitialize注册打断方法,但最终打断回调只会作用在先注册的那个模块中,
很蛋疼吧。。。所以对于AudioSession的使用最好的方法是生成一个类单独进行管理,统一接收打断回调并发送自定义的打断通知,
在需要用到AudioSession的模块中接收通知并做相应的操作。

摘自:http://www.cocoachina.com/industry/20140717/9162.html

static dispatch_once_t onceToken;
__block OSStatus error ;
dispatch_once(&onceToken, ^{ error = AudioSessionInitialize(NULL, NULL, nil, (__bridge void*) self);
if (error) printf("ERROR INITIALIZING AUDIO SESSION! %d\n", (int)error);
else
{
UInt32 category = kAudioSessionCategory_PlayAndRecord; error = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category); AudioSessionSetActive(true); if (error) printf("couldn't set audio category!"); error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, propListener,(__bridge void*) self);
if (error) printf("ERROR ADDING AUDIO SESSION PROP LISTENER! %d\n", (int)error);
UInt32 inputAvailable = 0;
UInt32 size = sizeof(inputAvailable); // we do not want to allow recording if input is not available
error = AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &size, &inputAvailable);
if (error) printf("ERROR GETTING INPUT AVAILABILITY! %d\n", (int)error); // we also need to listen to see if input availability changes
error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, propListener, (__bridge void*)self);
if (error) printf("ERROR ADDING AUDIO SESSION PROP LISTENER! %d\n", (int)error); error = AudioSessionSetActive(true);
if (error) printf("AudioSessionSetActive (true) failed"); UInt32 audioRoute = kAudioSessionOverrideAudioRoute_Speaker;
error = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRoute), &audioRoute);
if (error) printf("AudioSessionSetProperty (AudioRoute_Speaker) failed");
} });