我正在录制声音，然后改变音频的音高并保存。 我在录制语音后调用此方法，然后单击按钮更改音高，然后创建新文件但是无法听到音频，音频是用语音生成的，可能是错误？
-(void)saveEffectedAudioToFolder
{
NSError *error;
if (_audioEngine) {
AVAudioUnitTimePitch *pitchEffect = [AVAudioUnitTimePitch new];
pitchEffect.pitch = pitch;
AVAudioFormat * commonFormat = [[AVAudioFormat alloc] initWithCommonFormat:AVAudioPCMFormatFloat32 sampleRate:44100 channels:2 interleaved:NO];
//
AVAudioFile *outputFile = [[AVAudioFile alloc] initForWriting:[NSURL URLWithString:_filePathDstaud] settings:commonFormat.settings error:&error];
if (error) {
NSLog(@"Error is 1 %@",[error localizedDescription]);
}
[pitchEffect installTapOnBus: 0 bufferSize: 8192 format: commonFormat block: ^(AVAudioPCMBuffer *buffer, AVAudioTime *when)
//here is that error
{
if (outputFile.length < _audioFile.length)
{
//Let us know when to stop saving the file, otherwise saving infinitely
NSError *error;
NSAssert([outputFile writeFromBuffer:buffer error:&error], @"error writing buffer data to file, %@", [error localizedDescription]);
}else{
_audioEngine = nil;
[pitchEffect removeTapOnBus:0];//if we dont remove it, will keep on tapping infinitely
NSLog(@"Did you like it? Please, vote up for my question");
}
}
];
}
NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filePath = [documentsPath stringByAppendingPathComponent:name];
[fileManager removeItemAtPath:filePath error:&error];
}