how to change volume? about streamingkit HOT 9 CLOSED

Oh iOS it is recommended to use the MPVolumeView to allow users to control the volume. If you need programmatic control of the volume control for mixing or whatever reason then that's currently outside the scope of this project.

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oh,i see .I have solved this problem by using MPVolumeView.thanks :)

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For OS X?

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StreamingKit doesn't have inbuilt volume control (you can see from the API). I'm happy to take pull requests. If you want to add it yourself, there's thousands of pages on the internet about how to do it. Even adding using STKAudioPlayer.appendFrameFilter to change the volume by adjusting the amplitude of the frames wouldn't take very long.

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Thanks! A framefilter worked for me. First take on implementation if others need it:

__weak __typeof(self)wself = self;

[self.stkAudioPlayer addFrameFilterWithName:@"Volume" afterFilterWithName:nil block:^(UInt32 channelsPerFrame, UInt32 bytesPerFrame, UInt32 frameCount, void *frames) {
        float volume = wself.volume;

        SInt16* samples16 = (SInt16*)frames;
        SInt32* samples32 = (SInt32*)frames;

        if (bytesPerFrame / channelsPerFrame == 2)
        {
            for (int i = 0; i < frameCount * channelsPerFrame; i += channelsPerFrame)
            {
                samples16[i] = samples16[i] *volume;
                samples16[i + 1] = samples16[i + 1] *volume;
            }
        }
        else if (bytesPerFrame / channelsPerFrame == 4)
        {
            for (int i = 0; i < frameCount * channelsPerFrame; i += channelsPerFrame) 
            {
                samples32[i] = samples32[i] * volume;
                samples32[i+1] = samples32[i+1] * volume;
            }
        }
        else
        {
            return;
        }
    }];

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I think on Mac (not iOS) you could use this as well...but I haven't tested it:

AudioUnitSetParameter (audioUnit, kHALOutputParam_Volume, kAudioUnitScope_Output, busNumber, volume, 0);

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Thanks for the example code of your solution btw 👍

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Ok I've added volume control support in master via the volume property. On iOS it uses a multi-channel mixer. Since the mixer will add a slight overhead, on iOS volume control won't work unless you pass in the STKAudioPlayerOptionEnableVolumeMixer options when initialising the player.

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👍

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