buffer - AVPlayer 的默认缓冲区大小是多少？

Question

iOS AVPlayer 的默认最大和最小缓冲区大小是多少？如何增加 mp3 流媒体的大小？谢谢你

Answer 1

如果您的 缓冲区大小 意味着播放缓冲区，那么我相信这个大小没有记录。
此行为由 AVFoundation 提供，引用于 Advances in AVFoundation Playback

And we see that playback starts but then we quickly run into a stall because we didn't have enough buffer to play to the end.

In that case, we'll go into the waiting state and re-buffer until we have enough to play through.

他们刚刚提到 够了不是确切的时间或大小，它是根据当前网络情况的动态度量单位，但谁知道呢。
回到主题，如果您想控制缓冲。
您可以关注 AVPlayerItem的 loadedTimeRanges属性(property)。
下面的代码片段有 5 秒的缓冲时间:

if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
    
    NSArray *timeRanges = (NSArray *)[change objectForKey:NSKeyValueChangeNewKey];
    if (timeRanges && [timeRanges count]) {
        CMTimeRange timerange = [[timeRanges objectAtIndex:0] CMTimeRangeValue];
        
        if (self.audioPlayer.rate == 0 && !pauseReasonForced) {
            CMTime bufferdTime = CMTimeAdd(timerange.start, timerange.duration);
            CMTime milestone = CMTimeAdd(self.audioPlayer.currentTime, CMTimeMakeWithSeconds(5.0f, timerange.duration.timescale));
            
            if (CMTIME_COMPARE_INLINE(bufferdTime , >, milestone) && self.audioPlayer.currentItem.status == AVPlayerItemStatusReadyToPlay && !interruptedWhilePlaying && !routeChangedWhilePlaying) {
                if (![self isPlaying]) {
                    
                    [self.audioPlayer play];
                }
            }
        }
    }
}