iOS - 如何使用AVFoundation播放音频文件

Question

我想使用AV Foundation播放一个声音文件（我已经将其拖入Xcode并复制到项目中），但使用以下代码失败：

我认为NSURL *url = [[NSURL alloc] initWithString:@"sound.caf"]; 这里出了问题，但除了这种方式，我不知道怎样用声音文件实例化AVAsset（当然，可能还有其他地方出错）。无论如何，有人能给我提供帮助吗？谢谢。

AVMutableComposition *composition = [AVMutableComposition composition];
CMPersistentTrackID trackID = kCMPersistentTrackID_Invalid;
AVMutableCompositionTrack *compositionTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:trackID];

NSURL *url = [[NSURL alloc] initWithString:@"sound.caf"];

AVAsset *songAsset = [AVURLAsset URLAssetWithURL:url options:nil];
AVAssetTrack *assetTrack = [[songAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];


CMTime startTime = CMTimeMakeWithSeconds(0, 1);
CMTime endTime = songAsset.duration;
CMTimeRange tRange = CMTimeRangeMake(startTime, endTime);

NSError *error = nil;

[compositionTrack insertTimeRange:tRange ofTrack:assetTrack atTime:CMTimeMake(0, 44100) error:&error];

AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:composition];
self.player = [[AVPlayer alloc] initWithPlayerItem:playerItem];

[self.player play];

- Newbie

Answer 1

这段代码应该能帮到你：

    NSString *soundPath = [[NSBundle mainBundle] pathForResource:@"myfile" ofType:@"wav"];
    NSURL *soundURL = [NSURL fileURLWithPath:soundPath];

    NSError *error = nil;
    AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundURL error:&error];

    if (error) {
        NSLog(@"%@",[error localizedDescription]);
    }

    [player play];

- Sergey Demchenko

---

谢谢，Sergey，很方便找到这个。如果您正在CLI程序中尝试此操作系统X，则需要循环直到播放器完成。在开始播放后，我使用了以下循环：“do {CFRunLoopRunInMode（kCFRunLoopDefaultMode，0.25，false）;} while（player.isPlaying）;” - original_username

Answer 2

尝试一下。

NSString *shutterplayerPath =
  [[NSBundle mainBundle] pathForResource:@"shutter" ofType:@"mp3"];
NSString *tickplayerPath =
  [[NSBundle mainBundle] pathForResource:@"tick" ofType:@"wav"];
shutterAudioPlayer = 
  [[AVAudioPlayer alloc] initWithContentsOfURL:[[NSURL alloc]
initFileURLWithPath: shutterplayerPath] error:NULL];
tickAudioPlayer =
  [[AVAudioPlayer alloc] initWithContentsOfURL:[[NSURL alloc];
initFileURLWithPath:tickplayerPath] error:NULL];
[shutterAudioPlayer play];
[tickAudioPlayer play];

- Shyam Dixit