ios - 插入耳机时如何使用背景音轨录制语音

我正在开发卡拉OK录音之类的应用程序。当耳机未插入设备时，我能够记录包括背景音轨在内的整个音频流。但是当耳机插入设备时，它仅在录制声音流，不包括背景音轨。我想录制包括背景音轨在内的人声流。

我的代码是:

//For Recording

  NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];
 [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
 [recordSetting setValue:[NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey];
 [recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];

 NSError *error = nil;

 audioRecorder = [[AVAudioRecorder alloc]
                          initWithURL:soundFileURL
                          settings:recordSetting error:&error];
 audioRecorder.delegate=self;

 AVAudioSession* session = [AVAudioSession sharedInstance];

[session setCategory:AVAudioSessionCategoryPlayAndRecord
                        error:&error];

[session overrideOutputAudioPort:AVAudioSessionPortOverrideNone
                                                 error:&error];
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,
                                     sizeof (audioRouteOverride),&audioRouteOverride);
[audioRecorder prepareToRecord];
[audioRecorder record];

//  Playing  Karaoke video file


NSURL *movieURL = [NSURL fileURLWithPath: [[CommonUISetting applicationDocumentsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4",songInfo.fileName]]] ;

movieController=[[MPMoviePlayerController alloc]initWithContentURL:movieURL];
movieController.controlStyle = MPMovieControlStyleNone;
[movieController.view setFrame:CGRectMake(0, 0, viewPlayer.frame.size.width, viewPlayer.frame.size.height)];
[ movieController play];
[movieController.view setBackgroundColor:[UIColor clearColor]];
[viewPlayer addSubview:movieController.view];

提前致谢

最佳答案

要记录麦克风输入和音乐曲目，该应用必须使用允许原始音频样本捕获(音频队列或在AVAudioEngine上的轻击等)的API之一播放该轨道，然后将捕获的数据与记录的输入进行混合在将混音保存到文件之前，请从选定的麦克风中选择。

关于ios - 插入耳机时如何使用背景音轨录制语音，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27397221/