How to apply audio effects in iOS

Question

I use AVPlayer to play audio(streaming or local file). For this audio I want to apply some effects - boost volume, skip silence, reduce noise, change speed(in 0.1 intervals).

I did same thing in android by creating own player, decoding different audio formats into pcm data and then using some c libraries to modify it. It was quite complicated.

Is it possible to do with AVPlayer or how can I do that? Something like modifying audio already decoded by AVPlayer. Is there some ios api (AVAudioEngine?) or frameworks (audioKit?) which can do this?

Thanks!

You can do manipulations in pcm data and create audio files. Please check AVAssetWriter, AVAssetReader classes for this purposes. — Midhun MP, Jan 10 '19 at 08:07
Does it mean I can still use AVPlayer and just inject it and modify audio? — Martin Vandzura, Jan 10 '19 at 08:49
Is streaming a hard requirement? This is fairly easy to do with the built in effects and a local file. — dave234, Jan 14 '19 at 21:11
This question is two parts, getting pcm data from a stream, and playing pcm data through effects. I would consider closing this question and opening another, or maybe just editing this question, asking how to get PCM data from a stream first. — dave234, Jan 15 '19 at 03:36
I guess pcm data are probably already there in avplayer. Isn't it only possible to manipulate them? — Martin Vandzura, Jan 15 '19 at 08:00

score 2 · Answer 1 · answered Jan 20 '19 at 21:50

IMHO the best solution is to use https://github.com/audiokit/AudioKit as it is well maintained and supports most of the requirements you listed.

Another approach is to import the C library you used in the Android project and have a wrapper around it so it can easily used in ObjectiveC/Swift. With this approach you will have less code to maintain and you guarantee similar results between the two platforms. Do you care to share more about this code ?

How to apply audio effects in iOS

1 Answers1