质量差，同时尝试在iPhone中录制音频

Question

我正在使用AVAudioRecorder类录制用户在我的应用中输入的语音。我可以录制和播放声音。但是，产量的质量很低。尝试播放录制的音频时，背景中出现很多噪音。 我该怎么做才能获得丰富的音质输出。我正在使用以下设置（代码）来录制声音。

NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init]; 
    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatAppleLossless] forKey:AVFormatIDKey]; 
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; // previously i'v used 8400 
    [recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey]; 

和播放音频回

[[AVAudioSession sharedInstance] setCategory: 
AVAudioSessionCategoryPlayback error:NULL]; 

NSURL *fileTobePlayed = [NSURL fileURLWithPath:[[[[UIApplication sharedApplication]delegate] applicationDocumentsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",currentPage]]]; 
//AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error]; 
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileTobePlayed error:&error]; 

NSLog(@"The file being played is %@",fileTobePlayed); 
[audioPlayer prepareToPlay]; 
[audioPlayer play]; 
audioPlayer.volume = 4.0; 

由于下面的代码..

Answer 1

使用此代码添加它。

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;  

      AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,   
            sizeof (audioRouteOverride),&audioRouteOverride);