이 프로젝트는 마이크에서 오디오를 가져 와서 조용한 상태에서 시끄러운 소리와 방해를 유발합니다. 또한 끝 부분을 트리밍하고 페이드 인/페이드 아웃합니다.
https://github.com/fulldecent/FDSoundActivatedRecorder
관련 코드 당신이 찾고 있습니다 : 응답에 대한
- (NSString *)recordedFilePath
{
// Prepare output
NSString *trimmedAudioFileBaseName = [NSString stringWithFormat:@"recordingConverted%x.caf", arc4random()];
NSString *trimmedAudioFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:trimmedAudioFileBaseName];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:trimmedAudioFilePath]) {
NSError *error;
if ([fileManager removeItemAtPath:trimmedAudioFilePath error:&error] == NO) {
NSLog(@"removeItemAtPath %@ error:%@", trimmedAudioFilePath, error);
}
}
NSLog(@"Saving to %@", trimmedAudioFilePath);
AVAsset *avAsset = [AVAsset assetWithURL:self.audioRecorder.url];
NSArray *tracks = [avAsset tracksWithMediaType:AVMediaTypeAudio];
AVAssetTrack *track = [tracks objectAtIndex:0];
AVAssetExportSession *exportSession = [AVAssetExportSession
exportSessionWithAsset:avAsset
presetName:AVAssetExportPresetAppleM4A];
// create trim time range
CMTime startTime = CMTimeMake(self.recordingBeginTime*SAVING_SAMPLES_PER_SECOND, SAVING_SAMPLES_PER_SECOND);
CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, kCMTimePositiveInfinity);
// create fade in time range
CMTime startFadeInTime = startTime;
CMTime endFadeInTime = CMTimeMake(self.recordingBeginTime*SAVING_SAMPLES_PER_SECOND + RISE_TRIGGER_INTERVALS*INTERVAL_SECONDS*SAVING_SAMPLES_PER_SECOND, SAVING_SAMPLES_PER_SECOND);
CMTimeRange fadeInTimeRange = CMTimeRangeFromTimeToTime(startFadeInTime, endFadeInTime);
// setup audio mix
AVMutableAudioMix *exportAudioMix = [AVMutableAudioMix audioMix];
AVMutableAudioMixInputParameters *exportAudioMixInputParameters =
[AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track];
[exportAudioMixInputParameters setVolumeRampFromStartVolume:0.0 toEndVolume:1.0
timeRange:fadeInTimeRange];
exportAudioMix.inputParameters = [NSArray
arrayWithObject:exportAudioMixInputParameters];
// configure export session output with all our parameters
exportSession.outputURL = [NSURL fileURLWithPath:trimmedAudioFilePath];
exportSession.outputFileType = AVFileTypeAppleM4A;
exportSession.timeRange = exportTimeRange;
exportSession.audioMix = exportAudioMix;
// MAKE THE EXPORT SYNCHRONOUS
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
[exportSession exportAsynchronouslyWithCompletionHandler:^{
dispatch_semaphore_signal(semaphore);
}];
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
if (AVAssetExportSessionStatusCompleted == exportSession.status) {
NSLog(@"AVAssetExportSessionStatusCompleted");
return trimmedAudioFilePath;
} else if (AVAssetExportSessionStatusFailed == exportSession.status) {
// a failure may happen because of an event out of your control
// for example, an interruption like a phone call comming in
// make sure and handle this case appropriately
NSLog(@"AVAssetExportSessionStatusFailed %@", exportSession.error.localizedDescription);
} else {
NSLog(@"Export Session Status: %d", exportSession.status);
}
return nil;
}
GitHub u가 제공하는 오류의 예 : 캐치되지 않은 예외 'NSInvalidArgumentException'으로 인해 앱 종료 중, 이유 : '*** - [NSURL initFileURLWithPath :] : nil string parameter' –