ios – 检测AvPlayer切换比特率的时间

我最近遇到过类似的问题.解决方案感觉有点hacky,但它在我看到的情况下起作用.首先,我为新的Access Log通知设置了一个观察者：

[[NsnotificationCenter defaultCenter] addObserver:self
                                         SELEctor:@SELEctor(handleAVPlayerAccess:)
                                             name:AVPlayerItemNewAccessLogEntryNotification
                                           object:nil];

哪个叫这个功能.它可能可以优化,但这是基本的想法：@H_262_4@

- (void)handleAVPlayerAccess:(Nsnotification *)notif {
    AVPlayerItemAccessLog *accessLog = [((AVPlayerItem *)notif.object) accessLog];
    AVPlayerItemAccessLogEvent *lastEvent = accessLog.events.lastObject;
    float lastEventnumber = lastEvent.inDicatedBitrate;
    if (lastEventnumber != self.lastBitRatE) {
        //Here is where you can increment a variable to keep track of the number of times you switch your bit rate.
        NSLog(@"Switch inDicatedBitrate from: %f to: %f",self.lastBitRate,lastEventnumber);
        self.lastBitRate = lastEventnumber;
    }
}

每次访问日志都有新条目时,它会检查最近一个条目的最后指示比特率(播放器项目的访问日志中的lastObject).它将此指示的比特率与存储来自最后一次更改的比特率的属性进行比较.@H_262_4@