ios - 如何在 iOS 中设置 AVPlayer 声级计？

Question

我在使用 HTTP 直播的应用程序中使用 AVPlayer。现在我想为该音频流实现一个电平表。 我找到了几个使用 AVAudioPlayer 的例子。但是我找不到解决方案来关闭所需的信息。

AVPlayer.NSURL *url = [NSURL URLWithString:@"http://www.stephaniequinn.com/Music/Allegro%20from%20Duet%20in%20C%20Major.mp3"];
self.playerItem = [AVPlayerItem playerItemWithURL:url];
self.player = [AVPlayer playerWithPlayerItem:self.playerItem];
self.player = [AVPlayer playerWithURL:url];
[self.player play];

Answer 1

请试试这个

if ([mPlayer respondsToSelector:@selector(setVolume:)]) {
    mPlayer.volume = 0.0;
 } else {
     NSArray *audioTracks = mPlayerItem.asset.tracks;

     // Mute all the audio tracks
     NSMutableArray *allAudioParams = [NSMutableArray array];
     for (AVAssetTrack *track in audioTracks) {
         AVMutableAudioMixInputParameters *audioInputParams =[AVMutableAudioMixInputParameters audioMixInputParameters];
         [audioInputParams setVolume:0.0 atTime:kCMTimeZero];
         [audioInputParams setTrackID:[track trackID]];
         [allAudioParams addObject:audioInputParams];
     }
     AVMutableAudioMix *audioZeroMix = [AVMutableAudioMix audioMix];
     [audioZeroMix setInputParameters:allAudioParams];

     [mPlayerItem setAudioMix:audioZeroMix]; // Mute the player item
 }