将 currentTime 设置为 0.0 后 AVAudioPlayer 随机不播放

Question

我有一个 AVAudioPlayer 实例（许多实例之一）被迫一次又一次地重新开始播放，通常是在它结束之前。声音大约有 1.3 秒，大约每 0.7 秒重复一次（当它超过其持续时间的一半时）。

问题是有时（可能占所有情况的 5%）声音不播放。

该文件是单声道AAC（我尝试了两个不同的短文件，效果相似）。

确切的代码如下所示：

- (void)restartPlay:(AVAudioPlayer *)player position:(CGPoint)p volume:(float)volume loops:(NSInteger)loops;
{
    NSString *filename = [self debug_resolveSoundName:player];

    DLogShort(@"\n[restartPlay...] in:   %@, %@, t:%f, vol:%f, pan:%f, loops:%li", filename, player.isPlaying?@"playing":@"not playing", player.currentTime, player.volume, player.pan, player.numberOfLoops);

    player.currentTime = 0.0;

    DLogShort(@"[restartPlay...] mid1:   %@, %@, t:%f, vol:%f, pan:%f, loops:%li", filename, player.isPlaying?@"playing":@"not playing", player.currentTime, player.volume, player.pan, player.numberOfLoops);

    [player play];

    DLogShort(@"[restartPlay...] mid2:   %@, %@, t:%f, vol:%f, pan:%f, loops:%li", filename, player.isPlaying?@"playing":@"not playing", player.currentTime, player.volume, player.pan, player.numberOfLoops);

    player.pan = [self getPan:p];
    player.volume = volume;
    player.numberOfLoops = loops;

    DLogShort(@"[restartPlay...] out:   %@, %@, t:%f, vol:%f, pan:%f, loops:%li \n", filename, player.isPlaying?@"playing":@"not playing", player.currentTime, player.volume, player.pan, player.numberOfLoops);
}

输出：

[restartPlay...] in:   audioFile1, playing, t:0.704104, vol:1.000000, pan:0.332738, loops:0
[restartPlay...] mid1:   audioFile1, not playing, t:0.000000, vol:1.000000, pan:0.332738, loops:0
[restartPlay...] mid2:   audioFile1, not playing, t:0.000000, vol:1.000000, pan:0.332738, loops:0
[restartPlay...] out:   audioFile1, not playing, t:0.000000, vol:1.000000, pan:0.311913, loops:0

奇怪的是，声音的属性 isPlaying 最初是 YES 并且在将 currentTime 设置为零之后（如我所料，样本的最开始）它的状态player.isPlaying 变为 NO。然后在调用 -play 之后它仍然没有播放（isPlaying 仍然 NO 而且我没有听到它）。

下一次在同一个 AVAudioPlayer 实例上调用同一个方法修复了这个问题（再次播放）。

Answer 1

这可能有助于停止或暂停，然后更改当前时间，然后播放。

将 currentTime 设置为 0.0 后 AVAudioPlayer 随机不播放

AVAudioPlayer randomly not playing after setting currentTime to 0.0

objective-c

avaudioplayer

ios