我有一个从avqueueplayer玩的网址列表 . 我正在加载曲目和可播放键，并在每个项目完成播放后逐个将AVplayeritems添加到队列播放器中 .
我使用以下代码处理播放器的缓冲状态
for (NSValue *time in player.currentItem.loadedTimeRanges)
{
CMTimeRange range;
[time getValue:&range];
CGFloat seekTimeInSeconds = [self playerTimeToSeek];
CMTime timeSeek = CMTimeMakeWithSeconds(seekTimeInSeconds, NSEC_PER_SEC);
bufferReady = CMTimeRangeContainsTime(range, timeSeek);
NSLog(@"%f , %f ",CMTimeGetSeconds(range.start), CMTimeGetSeconds(range.duration));
if (CMTimeGetSeconds(range.duration)==0)
{
[self.player seekToTime: CMTimeMakeWithSeconds(seekTimeInSeconds, NSEC_PER_SEC) ];
}
if ((seekTimeInSeconds) >= CMTimeGetSeconds(self.player.currentItem.duration)) //
{
bufferReady = YES;
}
if (bufferReady)
{
//if (self.bufferEmptyOccured || change|| self.bufferNeedsUpdate)
{
[self manageBufferSufficientState];
self.bufferNeedsUpdate = NO;
}
self.bufferEmptyOccured = NO;
break;
}
}
if (!player.currentItem && self.nowPlayingAudioRecord[@"AudioItem"])
{
{
bufferReady = YES;
//if (self.bufferEmptyOccured||change || self.bufferNeedsUpdate)
{
[self manageBufferSufficientState];
self.bufferNeedsUpdate = NO;
}
self.bufferEmptyOccured = NO;
}
}
if (self.nowPlayingAudioRecord &&! self.nowPlayingAudioRecord[@"AudioItem"])
{
bufferReady = NO;
}
if (!bufferReady)
{
//if (!self.bufferEmptyOccured || change || self.bufferNeedsUpdate)
{
[self manageBufferEmptyState];
if (self.bufferNeedsUpdate)
{
self.bufferNeedsUpdate = NO;
}
}
self.bufferEmptyOccured = YES;
}
}）;
'playertimetoseek'方法确定玩家在缓冲区准备就绪时必须寻找的时间 . 这是因为我的每个网址都需要在预定义的时间播放才能播放 . 通过使用计时器验证缓冲状态，每0.6秒定期调用此方法一次
它运行正常，但由于某种原因，在音频的持续时间内，一些网址永远不会被缓冲（每个音频的持续时间为10-20秒）并且日志被打印为
2013-11-21 18:51:02.404 myapp [523：1000b] 1.009063,0.000000
2013-11-21 18：51：03.003 myapp [523：1000b] 1.608808,0.000000
2013-11-21 18:51:03.606 myapp [523：1000b] 2.208690,0.000000
2013-11-21 18：51：04.203 myapp [523：1000b] 2.811525,0.000000
2013-11-21 18：51：04.804 myapp [523：1000b] 3.408591,0.000000
2013-11-21 18：51：05.403 myapp [523：1000b] 4.009229,0.000000
2013-11-21 18：51：06.003 myapp [523：1000b] 4.608602,0.000000
2013-11-21 18:51:06.604 myapp [523：1000b] 5.208743,0.000000
2013-11-21 18:51:07.204 myapp [523：1000b] 5.809145,0.000000
2013-11-21 18:51:07.803 myapp [523：1000b] 6.409183,0.000000
2013-11-21 18:51:08.404 myapp [523：1000b] 7.008626,0.000000
2013-11-21 18：51：09.003 myapp [523：1000b] 7.609262,0.000000
2013-11-21 18：51：09.604 myapp [523：1000b] 8.208768,0.000000
2013-11-21 18:51:10.203 myapp [523：1000b] 8.809213,0.000000
2013-11-21 18：51：10.804 myapp [523：1000b] 9.408639,0.000001
2013-11-21 18：51：11.404 myapp [523：1000b] 9.408639,0.000001
2013-11-21 18:51:12007 myapp [523：1000b] 10.579592,0.000000
请注意，我在一个不错的网络上，音频比特率为128Kbps . 为什么会发生这种情况？这有什么具体原因吗？
编辑::在其他一些情况下，日志如下：
2013-11-21 20：53：33.970 myApp [819：605b] 2.358489,0.000000
2013-11-21 20：53：34.570 myApp [819：605b] 2.958184,0.000000
2013-11-21 20：53：35.170 myApp [819：605b] 3.558097,0.000000
2013-11-21 20：53：35.770 myApp [819：605b] 4.158253,0.000000
2013-11-21 20：53：36.371 myApp [819：605b] 4.758271,0.000000
2013-11-21 20：53：36.970 myApp [819：605b] 5.358620,0.000000
2013-11-21 20：53：37.570 myApp [819：605b] 5.958164,0.000000
2013-11-21 20：53：38.170 myApp [819：605b] 6.558318,0.000000
2013-11-21 20：53：38.770 myApp [819：605b] 7.158033,0.000000
2013-11-21 20：53：39.371 myApp [819：605b] 7.758199,0.000009
2013-11-21 20：53：39.971 myApp [819：605b] 7.758199,0.417969
2013-11-21 20：53：40.571 myApp [819：605b] 7.758199,9.247356
2013-11-21 20：53：41.171 myApp [819：605b] 9.978836,19.095449
2013-11-21 20：53：41.770 myApp [819：605b] 9.978836,19.095449
2013-11-21 20：53：42.371 myApp [819：605b] 9.978836,19.095449
2013-11-21 20：53：42.971 myApp [819：605b] 9.978836,19.095449
2013-11-21 20：53：43.573 myApp [819：605b] 9.978836,19.095449
2013-11-21 20：53：44.171 myApp [819：605b] 9.978836,19.095449
这是怎么发生的 . 它在20：53：39.971之前没有缓冲任何东西，并且在0.6秒内缓冲几乎所有东西 . 缓冲是如何工作的？