尝试在 iPhone 中录制音频时音质不佳

Question

我正在使用 AVAudioRecorder 类在我的应用程序中录制用户输入的声音。我能够录制和播放声音。但是，输出的质量非常低。尝试播放录制的音频时，我在背景中听到很多噪音。 我应该怎么做才能获得高质量的音频输出。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];

以及下面用于播放音频的代码

[[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;

谢谢..

Answer 1

使用此代码添加它。

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;     

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