錄音

NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];
    NSString *fullPath = [path stringByAppendingPathComponent:@"test.caf"];
    NSURL *url = [NSURL URLWithString:fullPath];
    
    NSMutableDictionary *recordSettings = [NSMutableDictionary dictionary];
    
    //編碼格式
    [recordSettings setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    // 采樣率
    [recordSettings setValue :[NSNumber numberWithFloat:11025.0] forKey: AVSampleRateKey];
    // 通道數(shù)
    [recordSettings setValue :[NSNumber numberWithInt:2] forKey: AVNumberOfChannelsKey];
    //音頻質(zhì)量,采樣質(zhì)量
    [recordSettings setValue:[NSNumber numberWithInt:AVAudioQualityMin] forKey:AVEncoderAudioQualityKey];

    AVAudioRecorder *recorder = [[AVAudioRecorder alloc]initWithURL:url settings:recordSettings error:nil];

    //2. prepare to record
    [recorder prepareToRecord];
    
    //3. 開始錄音
    [recorder record];  // 直接錄音, 需要手動停止
    [recorder recordForDuration:5];  // 從當前執(zhí)行這行代碼開始錄音, 錄音5秒
    [recorder recordAtTime:recorder.deviceCurrentTime + 2]; // 2s后錄音, 需要手動停止
    
    [recorder recordAtTime:recorder.deviceCurrentTime + 2 forDuration:5];

播放聲音

• 導入框架

#import <AVFoundation/AVFoundation.h>

    //1. 需要播放的url
    NSURL *url = [[NSBundle mainBundle]URLForResource:@"m_17.wav" withExtension:nil];
    CFURLRef urlRef = (__bridge CFURLRef)(url);
    
    //2. 創(chuàng)建SystemSoundID
    SystemSoundID soundID;  //類型: typedef unsigned int UInt32;
    AudioServicesCreateSystemSoundID(urlRef, &soundID);
    
    //1. 創(chuàng)建another SystemSoundID
    NSURL *url2 = [[NSBundle mainBundle]URLForResource:@"win.aac" withExtension:nil];
    CFURLRef urlRef2 = (__bridge CFURLRef)url2;
    SystemSoundID soundID2;
    AudioServicesCreateSystemSoundID(urlRef2, &soundID2);
    
    //3. 播放
//    AudioServicesPlayAlertSoundWithCompletion(soundID, ^{
//    AudioServicesDisposeSystemSoundID(soundID);
//        NSLog(@"播放over");
//    });
    
    //3. 播放完一個音頻,緊接著播放另外一個音頻
    AudioServicesPlayAlertSoundWithCompletion(soundID, ^{
        
        //url播放完畢,釋放
        AudioServicesDisposeSystemSoundID(soundID);
       
        AudioServicesPlaySystemSoundWithCompletion(soundID2, ^{
            
            //url2播放完畢,釋放soundID2
            AudioServicesDisposeSystemSoundID(soundID2);
            NSLog(@"播放2個音頻完畢");
        });
    });

播放本地音樂

- (AVAudioPlayer *)player{
    if (!_player) {
        
        // 1. 創(chuàng)建播放器對象
        // 雖然傳遞的參數(shù)是NSURL地址, 但是只支持播放本地文件, 遠程音樂文件路徑不支持
        NSURL *url = [[NSBundle mainBundle]URLForResource:@"簡單愛.mp3" withExtension:nil];
        _player = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:nil];
        
        //允許調(diào)整速率,此設(shè)置必須在prepareplay 之前
        _player.enableRate = YES;
        _player.delegate = self;
        
        [_player prepareToPlay];
        
    }
    return _player;
}
- (IBAction)startPlay {
    [self.player play];
}

- (IBAction)pause {
    
    [self.player pause];
}

- (IBAction)stop {
    
    [self.player stop];
    //為保證下次start時,從頭播放.self.currentTime需要設(shè)置為0,因為系統(tǒng)不會重置.
    self.player.currentTime = 0;
    
    //或者清空player
    self.player = nil;
}

- (IBAction)forward5Seconds {
    
    self.player.currentTime += 5;
}

- (IBAction)back5Seconds {
    
    self.player.currentTime -= 5;
}

- (IBAction)times2Faster {
    
    self.player.rate = 2;
}

- (IBAction)volume:(UISlider *)sender {
    
    //音量
    self.player.volume = sender.value;
}
#pragma mark ------------------------------------------
#pragma mark AVAudioPlayerDelegate 監(jiān)聽播放完成
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
    
    //flag 表示是否播放有錯誤
    if (flag) {
        NSLog(@"play completed successfully");
    }
}

#pragma mark ------------------------------------------
#pragma mark 實現(xiàn)后臺播放
//注:模擬器不準確:如果不設(shè)置,在真機中,無法后臺播放
- (void)backPlay{
    
    //1.獲取音頻會話
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    
    //2.設(shè)置音頻播放模式
    [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
    
    //3.激活音頻會話
    [audioSession setActive:YES error:nil];
}

AVPlayer異步播放

- (void)asyncPlay:(AVURLAsset *)asset{
    NSArray *keys = @[@"playable", @"tracks",@"duration"];
    [asset loadValuesAsynchronouslyForKeys:keys completionHandler:^{
        
        AVPlayerItem *item = [AVPlayerItem playerItemWithAsset:asset];
        dispatch_async(dispatch_get_main_queue(), ^{
            
            self.playerItem = item;
            if (self.player) {
                
                [self.player replaceCurrentItemWithPlayerItem:item];
            }else{
                self.player = [AVPlayer playerWithPlayerItem:item];
                if ([YHIphoneTool yh_iphoneVersion:10]) {
                    self.player.automaticallyWaitsToMinimizeStalling = NO;
                }
            }
            
            if ([self.delegate respondsToSelector:@selector(remotePlayerDidFinishAsyncLoadValues:)]) {
                [self.delegate remotePlayerDidFinishAsyncLoadValues:self];
            }
        });
        
        
        NSError *error = nil;
        AVKeyValueStatus status =
        [asset statusOfValueForKey:@"playable" error:&error];
        switch (status) {
            case AVKeyValueStatusLoaded:
                // Sucessfully loaded, continue processing
                YHLog(@"Sucessfully loaded");
//                [self.player play];
                break;
            case AVKeyValueStatusFailed:
                // Examine NSError pointer to determine failure
                YHLog(@"fail loaded, %@", error.description);
                break;
            case AVKeyValueStatusCancelled:
                // Loading cancelled
                YHLog(@"cancel loaded");
                break;
            default:
                // Handle all other cases
                break;
        }
    }];
    
}