问在音频应用程序中使用诺沃卡因

EN

@interface Note : NSObject <NSCopying>
{
    NSString *name;
    AVAudioPlayer *soundFilePlayer;
    int stringNumber;
    int fretNumber; 
}

- (void)runMusicGenerator:(NSNumber *)counter
{
if (self.isRunning) {
    Note *NoteToPlay;
    // pulseRate is the time interval between beats
    // staticNoteLength = 1/4 notes, 1/8th notes, 16th notes, etc.

    float delay = self.pulseRate / [self grabStaticNoteLength];

    // user setting to play single, double or triplet notes. 
    if (self.beatCounter == CONST_BEAT_COUNTER_INIT_VAL) {
        NoteToPlay = [self.GuitarNeck generateNoteToPlayNext];
    } else {
        NoteToPlay = [self.GuitarNeck cloneNote:self.GuitarNeck.NoteToPlayNow];
    }

    self.GuitarNeck.NoteToPlayNow = NoteToPlay;

    [self callOutNoteToPlay];

    [self performSelector:@selector(runDrill:) withObject:NoteToPlay afterDelay:delay];
}

- (Note *)generateNoteToPlayNext
{
    if ((self.musicPaused) || (self.musicStopped)) {
        // grab the root note on the string to resume
        self.NoteToPlayNow = [self grabRootNoteForString];

        //reset the flags
        self.musicPaused = NO;
        self.musicStopped = NO;
    } else {
        // Set NoteRingingOut to NoteToPlayNow
        self.NoteRingingOut = self.NoteToPlayNow;

        // Set NoteToPlaNowy to NoteToPlayNext
        self.NoteToPlayNow = self.NoteToPlayNext;
        if (!self.NoteToPlayNow) {
            self.NoteToPlayNow = [self grabRootNoteForString];

            // now prep the note's audio player for playback
            [self.NoteToPlayNow.soundFilePlayer prepareToPlay];
        }        
    }

    // Load NoteToPlayNext
        self.NoteToPlayNext = [self generateRandomNote];
    }

    - (void)callOutNoteToPlay
    {    
        self.GuitarNeck.NoteToPlayNow.soundFilePlayer.delegate = (id)self;
        [self.GuitarNeck.NoteToPlayNow.soundFilePlayer setVolume:1.0];
        [self.GuitarNeck.NoteToPlayNow.soundFilePlayer setCurrentTime:0];
        [self.GuitarNeck.NoteToPlayNow.soundFilePlayer play];
    }

- (AVAudioPlayer *)buildStringNotePlayer:(NSString *)nameOfNote
{
    NSString *soundFileName = @"S";
    soundFileName = [soundFileName stringByAppendingString:[NSString stringWithFormat:@"%d", stringNumber]];
    soundFileName = [soundFileName stringByAppendingString:@"F"];

    if (fretNumber < 10) {
        soundFileName = [soundFileName stringByAppendingString:@"0"];
    }
    soundFileName = [soundFileName stringByAppendingString:[NSString stringWithFormat:@"%d", fretNumber]];

    NSString *soundPath = [[NSBundle mainBundle] pathForResource:soundFileName ofType:@"caf"];
    NSURL *fileURL = [NSURL fileURLWithPath:soundPath];
    AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];

    return notePlayer;
}

Novocaine *audioManager = [Novocaine audioManager];
[audioManager setOutputBlock:^(float *audioToPlay, UInt32 numSamples, UInt32 numChannels) {
    // All you have to do is put your audio into "audioToPlay".
}];

// AUDIO FILE READING OHHH YEAHHHH
// ========================================
NSURL *inputFileURL = [[NSBundle mainBundle] URLForResource:@"TLC" withExtension:@"mp3"];

fileReader = [[AudioFileReader alloc]
              initWithAudioFileURL:inputFileURL
              samplingRate:audioManager.samplingRate
              numChannels:audioManager.numOutputChannels];

[fileReader play];
fileReader.currentTime = 30.0;

[audioManager setOutputBlock:^(float *data, UInt32 numFrames, UInt32 numChannels)
{
    [fileReader retrieveFreshAudio:data numFrames:numFrames numChannels:numChannels];
    NSLog(@"Time: %f", fileReader.currentTime);
}];