Question

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;
    }

}）;

和＆＃39; playertimetoseek＆＃39;方法确定在缓冲区准备好的情况下玩家必须寻找的时间。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，但出于某种原因，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，我的网络很不错，音频比特率为128Kbps。为什么会发生这种情况？这有什么特别的原因吗？

编辑::在其他一些案例中，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。它没有缓冲任何东西，直到20：53：39.971并且在0.6秒内缓冲几乎所有东西。缓冲是如何工作的？

Avqueueplayer中的缓冲问题

0 个答案: