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我正在尝试使用 Gracenote API 从 iPhone 4s 麦克风捕捉音乐。

在设备上运行时，应用程序在failed to launch in time调用. 找到下面的日志。我从 GN 示例应用程序中复制并粘贴了大部分代码，运行良好。startRecordingGNAudioSourceMic

通过模拟器运行它没有问题。

    - (void)mk_initialize
    {
    AudioSessionInitialize (
                            NULL,
                            NULL,
                            interruptionListenerCallback,
                            (__bridge void *)(self)
                            );
    @try {
        _config = [GNConfig init:GN_CLIENT_ID];
    }
    @catch (NSException * e) {
        NSLog(@"clientId issue");
        return;
    }

    [self.config setProperty: @"debugEnabled"
                       value: @"1"];
    _recognizeFromStream = [GNRecognizeStream gNRecognizeStream:self.config];
    _audioConfig = [GNAudioConfig gNAudioConfigWithSampleRate:44100
                                               bytesPerSample:2
                                                 numChannels:1];
    _audioSourceMicObj = [GNAudioSourceMic gNAudioSourceMic:self.audioConfig];
    self.audioSourceMicObj.delegate = self;

     NSError *error = nil;
    [RecognizeStreamOperation recognizeStreamOperation:self.config];
    error = [self.recognizeFromStream startRecognizeSession:op
                                            audioConfig:self.audioConfig];
    if (error) {
        NSLog(@"ERROR: %@",[error localizedDescription]);
    }
    [self.audioSourceMicObj startRecording]; // hanging call

    [self performSelectorInBackground:@selector(setUpRecognizePCMSession)
                           withObject:nil];
}

设备日志：

OS Version:      iOS 6.1.3 (10B329)
Report Version:  104

Exception Type:  00000020
Exception Codes: 0x000000008badf00d
Highlighted Thread:  0

Application Specific Information:
XXXXXXX failed to launch in time

Elapsed total CPU time (seconds): 3.080 (user 3.080, system 0.000), 15% CPU 
Elapsed application CPU time (seconds): 0.527, 3% CPU

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0:
0   libsystem_kernel.dylib          0x397ab0fc __psynch_mutexwait + 24
1   libsystem_c.dylib               0x396f4124 pthread_mutex_lock + 388
2   AudioToolbox                    0x30fd54e8 CAMutex::Lock() + 32
3   AudioToolbox                    0x3102645c AUConverterBase::Reset(unsigned long,   unsigned long) + 48
4   AudioToolbox                    0x310df602 AUGenericOutput::Start() + 26
5   AudioToolbox                    0x310d1126 AURemoteIO::Start() + 942
6   AudioToolbox                    0x31100776 AUMethodStart(void*) + 118
.
.
.
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1 回答 1

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当您尝试启动应用程序时，您设备上的其他应用程序是否正在使用麦克风？您应该确保将音频会话类别设置为支持录制的类别，并在调用实例之前激活音频start会话GnAudioSourceMic。例如：

NSError *error = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord   error:&error];
if (error) {
    NSLog(@"Error setting audio session category: %d, %@", [error code], [error description]);
}
[[AVAudioSession sharedInstance] setActive:YES error:&error];
if (error) {
    NSLog(@"Error activating audio session category: %d, %@", [error code], [error description]);
}
于 2013-09-24T18:27:37.403 回答