如何录制钢琴

Question

我有一个基于触摸的钢琴应用程序，现在我想在其中添加录音功能。有人能指导我这样做吗。但我需要把这个记录下来并发送到流。

-(void) viewDidLoad {
    [super viewDidLoad];
    [keyboardView setVisibleKeyRange: NSMakeRange(48, 5)];
    if (audio == nil) {
        [self setAudio:[NSMutableArray arrayWithCapacity:0]];
    }
    [drawingView setShowOutsideLedger:YES];
    NSString* plistPath = [[NSBundle mainBundle] pathForResource:@"keyboardLayout" ofType:@"plist"];
    NSArray* names = [NSArray arrayWithContentsOfFile:plistPath];
    // Load Audio
    for (int i = 0; i < [names count]; i++) {
        SystemSoundID soundID;
        AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:names[i] ofType:@"aif"]], &soundID);  
        NSNumber* audioId = @(soundID);
        [audio addObject:audioId];
    }
    [[self keyboardView] setDelegate:self];
    [[self octaveSelectionView] setDelegate:self];
     }
- (void) keysPressed:(NSSet *)keys {
    NSLog(@"keysPressed=%d", [keys count]);
    [drawingView addNotes:keys];
    for (NSNumber* keyIndex in keys) {
        if ([audio count] > [keyIndex intValue]) {
            SystemSoundID soundID = [audio[[keyIndex intValue]] unsignedLongValue];
            AudioServicesPlaySystemSound(soundID);
        }
    } }

Answer 1

只是给出一个想法，如何保存按键注释并在本地数据库上记录延迟计时器。之后使用AVAsset组合命中的音频和静音音频以保存或回放。它能帮助吗