waveform v3.0.1
node-waveform
Input: any format audio or video file
Output: any or all of these:
- transcoded audio file
- waveform.js-compatible JSON representation of the audio file
- PNG rendering of the waveform
This is a Node.js module that wraps the waveform command line interface. The C code is bundled from that repository, so if you want to file an issue with or fork the C code, go to the waveform repository.
Usage
At least one of the options transcode
, waveformjs
or png
is required as
output destination.
var waveform = require('waveform');
waveform(audiofile, {
// options
'scan': false, // whether to do a pass to detect duration
// transcoding options
transcode: "outputfile.mp3", // path to output-file, or - for stdout as a Buffer
bitrate: 320, // audio bitrate in kbps
format: "name", // e.g. mp3, ogg, mp4
codec: "name", // e.g. mp3, vorbis, flac, aac
mime: "mimetype", // e.g. audio/vorbis
'tag-artist': "artistname", // artist tag
'tag-title': "title", // title tag
'tag-year': 2000, // year tag
'tag-comment': "comment", // comment tag
// waveform.js options
waveformjs: "outputfile.json", // path to output-file, or - for stdout as a Buffer
'wjs-width': 800, // width in samples
'wjs-precision': 4, // how many digits of precision
'wjs-plain': false, // exclude metadata in output JSON (default off)
// png options
png: "outputfile.png", // path to output-file, or - for stdout as a Buffer
'png-width': 256, // width of the image
'png-height': 64, // height of the image
'png-color-bg': '00000000', // bg color, rrggbbaa
'png-color-center': '000000ff', // gradient center color, rrggbbaa
'png-color-outer': '000000ff', // gradient outer color, rrggbbaa
}, function(err, buf) {
// done
});
Installation
Install libgroove dev package. Only the main library is needed. Packages are available for common package managers.
Install libpng and zlib dev packages.
npm install waveform
8 years ago
9 years ago
10 years ago
10 years ago
10 years ago
10 years ago
10 years ago
10 years ago
11 years ago
11 years ago
12 years ago
12 years ago
12 years ago
12 years ago
12 years ago
12 years ago
12 years ago
12 years ago
12 years ago
12 years ago