iphone - AVPlayer 音量控制

Question

我想创建一个使 AVPlayer 的音频静音的按钮。

为什么我不能将 .volume 与 AVPlayer 一起使用，而只能与 AVAudioPlayer 一起使用？有没有其他方法可以改变音量？

例如music.volume = 0.0;

感谢您的回答。

Answer 1

从 iOS 7 开始，只需调用：

myAvPlayer.volume = 0;

否则，您将不得不使用烦人的setAudioMix解决方案。我在我的应用程序中检测到对此的支持如下：

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
 }

Answer 2

我使用下面的代码来静音 AVPlayer。

 float volSet = 0 ;
 AVAsset *avAsset = [[avPlayer currentItem] asset] ;
NSArray *audioTracks = [avAsset tracksWithMediaType:AVMediaTypeAudio] ;

 NSMutableArray *allAudioParams = [NSMutableArray array] ;
for(AVAssetTrack *track in audioTracks){
 AVMutableAudioMixInputParameters *audioInputParams = [AVMutableAudioMixInputParameters audioMixInputParameters] ;
[audioInputParams setVolume:volSet atTime:kCMTimeZero] ;
 [audioInputParams setTrackID:[track trackID]] ;
 [allAudioParams addObject:audioInputParams];
}
 AVMutableAudioMix *audioVolMix = [AVMutableAudioMix audioMix] ;
[audioVolMix setInputParameters:allAudioParams];
 [[avPlayer currentItem] setAudioMix:audioVolMix];

Answer 3

最好的方法如下

  AVAssetTrack* assetTrackAudio = [arrayTracks objectAtIndex:0];

    AVMutableAudioMixInputParameters* audioInputParams = [AVMutableAudioMixInputParameters audioMixInputParameters];
    [audioInputParams setVolume:currentVolume atTime:playerCursorStartPosition];
    [audioInputParams setTrackID:[assetTrackAudio trackID]];

    NSArray* audioParams = [NSArray arrayWithObject:audioInputParams];
    AVMutableAudioMix* audioMix = [AVMutableAudioMix audioMix];
    [audioMix setInputParameters:audioParams];

    AVPlayerItem* item = [player currentItem];
    [item setAudioMix:audioMix];

Answer 4

看看这个链接

用于静音的苹果文档

下面是代码

 AVURLAsset *asset = [AVURLAsset URLAssetWithURL:[self myAssetURL] options:nil];
NSArray *audioTracks = [asset tracksWithMediaType:AVMediaTypeAudio];

// 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];

// Create a player item
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:asset];
[playerItem setAudioMix:audioZeroMix]; // Mute the player item

// Create a new Player, and set the player to use the player item
// with the muted audio mix
AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];

// assign player object to an instance variable
self.mPlayer = player;

// play the muted audio
[mPlayer play];

Answer 5

从 iOS 7 开始，还有一个muted属性 on AVPlayer：

@property (nonatomic, getter=isMuted) BOOL muted NS_AVAILABLE(10_7, 7_0);