AVPlayer音量滑块控件

时间:2013-07-30 13:35:21

标签: iphone ios objective-c volume avplayer

我有一个应用程序,我通过AVPlayer中的URL来流式传输:

NSURL *myURL = [NSURL URLWithString:urlString];

    AVPlayer *player = [[AVPlayer alloc]initWithURL:myURL];
    self.player = player;
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(playerItemDidReachEnd:)
                                                 name:AVPlayerItemDidPlayToEndTimeNotification
                                               object:[self.player currentItem]];
    [self.player addObserver:self forKeyPath:@"status" options:0 context:nil];
    [self.player play];

我想要的是有一个滑块来控制音量。我知道使用AVAudioPlayer很容易,因为它有一个属性,但不是AVPlayer。

我怎么能这样做?我是否必须使用AVAsset,因为我看到there,以及如何(因为我现在不在我的代码中使用它们)?

谢谢你!

1 个答案:

答案 0 :(得分:0)

您必须使用UISlider valueChanged:action中指定的卷创建AVMutableAudioMix。像这样:

- (IBAction) sliderValueChanged:(UISlider *)sender {
    AVMutableAudioMixInputParameters *audioInputParams = 
    [AVMutableAudioMixInputParameters audioMixInputParameters];
    [audioInputParams setVolume:sender.value atTime:kCMTimeZero];
    AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
    [audioMix setInputParameters:@[audioInputParams]];
    [[player currentItem] setAudioMix:audioMix]; (from a UISlider valueChanged action)
}