Drawing waveform with AVAssetReader

I was searching for a similar thing and decided to "roll my own." I realize this is an old post, but in case anyone else is in search of this, here is my solution. it is relatively quick and dirty and normalizes the image to "full scale". the images it creates are "wide" ie you need to put them in a UIScrollView or otherwise manage the display. this is based on some answers given to this question

[ta2yak]

音声から波形データの取得方法

[xoyip]

これもあとで見ると思う

[kjee]

波形表示