話し始めるとユーザーの声を録音し、録音した音の高さを変えて再生するiPhoneアプリケーションを実装する必要があります。AVAudiorecorderの助けを借りて、音の検出で音声を録音することができ、Diracライブラリを使用して録音された音のピッチを変更しました。このアプローチの問題は、出力音が十分にノイズが多いことです。SoundEngineを使用するための応答を受け取りましたが、それを実装する方法がわかりませんでした。誰かがこれを実装する他の方法について私に説明できますか?
my code//
-(void)initialSetup
{
count=0;
silenceTime=0;
//[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
recordSetting = [[NSMutableDictionary alloc] init];
[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatAppleLossless] forKey:AVFormatIDKey];
[recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
[recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];
recordedTmpFile = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat: @"%.0f.%@",[NSDate timeIntervalSinceReferenceDate]*1000.0, @"caf"]]];
recorder = [[ AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSetting error:&error];
//recorder = [[ AVAudioRecorder alloc] init];
[recorder setDelegate:self];
[recorder updateMeters];
[recorder prepareToRecord];
//[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayAndRecord error: nil];
//In Order To Move Sound To The Speaker
//UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
//AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof(audioRouteOverride),&audioRouteOverride);
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir stringByAppendingPathComponent:@"audio.caf"];
recordedTmpFile1 = [NSURL fileURLWithPath:soundFilePath];
recordSetting1 = [[NSMutableDictionary alloc] init];
recordSetting1 = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],AVEncoderAudioQualityKey,
//[NSNumber numberWithInt:kAudioFormatAppleIMA4],AVFormatIDKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,nil];
recorder1 = [[AVAudioRecorder alloc] initWithURL:recordedTmpFile1 settings:recordSetting1 error:&error];
[recorder1 prepareToRecord];
[recorder1 setDelegate:self];
if(recorder)
{
recorder.meteringEnabled = YES;
[recorder record];
double val=[recorder peakPowerForChannel:0];
NSLog(@"The Very First Value Of The Recorder Is=%f",val);
levelTimer = [NSTimer scheduledTimerWithTimeInterval:0.4 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
}
else
{
NSLog(@"error in initilising of the recorder=%@",[error localizedDescription]);
}
}
-(void)levelTimerCallback:(NSTimer *)timer
{
[recorder updateMeters];
const double ALPHA = 0.05;
//NOISE FILERATION ALGORITHMS
double peakPowerForChannel = pow(10,(0.05 *[recorder peakPowerForChannel:0]));
double audioMonitorResults1 = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * audioMonitorResults1;
double audioMonitorResults;
audioMonitorResults= [recorder peakPowerForChannel:0];
NSLog(@"This time only frequency is==>%f",audioMonitorResults1);
//if (audioMonitorResults1 >0.020)
if(audioMonitorResults1 > .05)//the value of audioMonitorResults may be equal to -10 for device
{
[recorder1 updateMeters];
recorder1.meteringEnabled=YES;
//recorder.meteringEnabled=YES;
[recorder1 record];
NSLog(@"SOUND IS DETECTED");
NSLog(@"%f",[recorder1 peakPowerForChannel:0]);
NSLog(@"Recording is going on");
count=1;
silenceTime=0;
}
else
{
NSLog(@"NO SOUND IS DETECTED");
silenceTime=silenceTime+0.3;
if(count==1 && silenceTime>1)
{
[levelTimer invalidate];
[recorder1 stop];
}
}
}
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag
{
NSLog(@"Recorder stop delegate is processing");
if(flag)
{
NSLog(@"Player has finished successfully");
[self playRecording];
}
else
{
NSLog(@"problem in recording.......not recorded");
}
}