CODEWITHSUNDEEP
iosobjective-cavplayer
Zoltan Krix
Zoltan Krix

Reputation: 83

AVMutableAudioMixInputParameters setVolume atTime not working only with kCMTimeZero

Im am developing an iOS app in Xcode. I am still new to programming. I am trying to set the volume of an audiotrack while playing it with an AVPlayer. It is working great if a set the time at kCMTimeZero but I want it to set the volume one second after the button was pressed.

Not working

- (IBAction)maxVolButtonPressed:(id)sender {
    [audioInputParams1 setVolume:1 atTime:time1];
    [self applyAudioMix];
}

Working

- (IBAction)minVolButtonPressed:(id)sender {
    [audioInputParams1 setVolume:0 atTime:kCMTimeZero];
    [self applyAudioMix];
}

What should I write after atTime if I want a one second delay?

ANSWER: Ok so I figured it out. You have to add the time where the current item is at the moment. I use setVolumeRampFromStartVolume with a very little time interval instead of setVolume. setVolume fades to the given volume for some reason I haven't figured it out why. It works for me like this:

CMTime time1 = CMTimeMake(1000, 1000); //2s
CMTime time2 = CMTimeMake(1001, 1000); //3s
CMTime timeCurrent = [player currentTime];
CMTime time1Added = CMTimeAdd(timeCurrent, time1);
CMTime time2Added = CMTimeAdd(timeCurrent, time2);
CMTimeRange fadeInTimeRange = CMTimeRangeFromTimeToTime(time1Added, time2Added);
[audioInputParams1 setVolumeRampFromStartVolume:0 toEndVolume:1 timeRange:fadeInTimeRange];
[self applyAudioMix];

Upvotes: 1

Views: 1123

Answers (1)

ljubiccica
ljubiccica

Reputation: 480

You should do something like this:

- (IBAction)maxVolButtonPressed:(id)sender {
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(setVolume:) userInfo:nil repeats:NO];
}

- (void)setVolume:(id)sender{
    [audioInputParams1 setVolume:1 atTime:kCMTimeZero];
    [self applyAudioMix];
}

In first method you are saying: wait for 1 second and then call method setVolume:.

Upvotes: 1

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