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Editorial Team
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Asked: 2026-06-12T07:19:30+00:00

How can i control my app’s output volume. I’ve got an app that uses

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How can i control my app’s output volume.

I’ve got an app that uses https://github.com/mattgallagher/AudioStreamer to stream mp3 files from the internet. The AudioStreamer class does not have a way to change output volume and I don’t want to change system volume.

Many apps do this:

  • iTunes
  • Spotify
  • MPlayerX
  • Most Audio Players

Edit: If you’re hear about AudioStreamer, I’ve since switched to Apple’s AVPlayer, which i’ve found far simpler and superior. Easy volume adjustment too!

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1 Answer

  1. Editorial Team

    AudioStreamer and I’m guessing most OSX media players use the AudioToolbox framework. AudioToolbox uses a programming interface called AudioQueue to playback media files. Here is the way to adjust the volume using AudioQueue.

    AudioQueueSetParameter(audioQueue, kAudioQueueParam_Volume, 0.5);
    • audioQueue is an AudioQueRef
    • kAudioQueueParam_Volume tells AudioQueueSetParameter() to change the Volume Parameter
    • 0.5 is the volume from 0.0 – 1.0

    More details on AudioQueue: https://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/AudioQueueReference/Reference/reference.html

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