Generate waveform data in JSON format from an audio file.

The generated JSON file is optimized for space. Thus, the precision is sufficient but not the most precise. The generated JSON structure only contains integers and not floats. Before getting passed to Waveform.js, values should be divided by 128.

waveform /path/to/my/audio.mp3 > waveform.json

This required sox and the soxi binary which should be included with the sox distribution.

echo "deb http://apt.delatech.net/ squeeze main" >> /etc/apt/sources.list
curl https://raw.githubusercontent.com/delatech/gpg/master/delatech-public-key-sign.asc | apt-key add -
apt-get update
apt-get install sox libsox-fmt-mp3 waveform

brew tap delatech/delatech
brew install sox
brew install delatech/waveform

go get github.com/delatech/waveform

Based on work from Sunjin Lee.