Random access and decode AAC audio track in a mp4 file in iOS

Question

I working on a project which involves decoding AAC track from a mp4 file into PCM format. So far, the only way I found that does this is by using AVAssetReader. However, this approach has 2 problems for me:
1) According to the guide, the AVAssetReader is not recommended for real-time processing. However, My project requires live decoding and playback, where the decoded PCMs are post-processed. Will this be a problem? If yes, what will be the alternative?
2) AVAssetReader seems to decode the track sequentially. It does not seem to allow jumping to a random point and decode from there, which is something required by my project. What will be solution?

How did you do with AVAssetReader? Actually I need that one. — Bhuvanendra Pratap Maurya, Sep 26 '19 at 12:52

score 0 · Accepted Answer · edited May 23 '17 at 11:43

0

Answer 1: If you have to deal with track in iPod library, AVAssetReader is the only way.If not, you can choose another decoder like FFmpeg.

Answer 2: AVAssetReader supports random access.It has a timeRange property, see https://stackoverflow.com/a/6719873/1060971.

edited May 23 '17 at 11:43

Community

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answered Apr 24 '15 at 09:44

vampirewalk

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Random access and decode AAC audio track in a mp4 file in iOS

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