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Convert audio files between Tencent apps (Weixin / Wechat, QQ) and Silk codec with other general formats such as MP3 and M4A

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wx-voice npm

Convert audio files between Tencent apps (Weixin / Wechat, QQ) and Silk codec with other general formats such as MP3 and M4A
中文版

Install

$ npm install wx-voice --save
$ npm install wx-voice -g
$ wx-voice compile

Prerequisites

CLI Usage

wx-voice <command> <options>

Example:
$ wx-voice decode -i input.silk -o output.mp3 -f mp3
$ wx-voice encode -i input.mp3 -o output.silk -f silk

CLI

Command:
  decode    decode to general audio format
  encode    encode from general audio format
  compile   compile wx-voice library
  clean     remove compiled library

Options:
  -i <input>    input file path
  -o <output>   output file path
  -f <format>   format of the output file
  --bitrate     bitrate of the output file
  --frequency   frequency of the output file
  --channels    channels of the output file

API Usage

// Initialize
const WxVoice = require('wx-voice');
var voice = new WxVoice();

// Error handler
voice.on("error", (err) => console.log(err));

// Decode silk to MP3
voice.decode(
    "input.silk", "output.mp3", { format: "mp3" },
    (file) => console.log(file));

// Output: "/path/to/output.mp3"

API

new WxVoice([tempFolder, [ffmpegPath]])

Initialize wxVoice object

Parameter Description
tempFolder Folder of temporary files, default to system temporary
ffmpegPath Custom path to ffmpeg executables, default using $PATH

decode(input, output, [options, [callback]])

Decode the audio to general formats

encode(input, output, [options, [callback]])

Encode the audio to silk/webm format

Parameter Description
input Input audio path
output Output audio path
options Output options (JS Object), see Options
callback Callback with output as parameter when decode success, undefined otherwise
voice.encode(
    "input.mp3", "output.silk", { format: "silk" },
    (file) => console.log(file));

// Output: "/path/to/output.silk"

duration(filePath, [callback])

Get the duration of the audio file
(Decode to general audio format before calling this method)

Parameter Description
filePath File path to the audio
callback Callback with duration of the audio in second as parameter when decode success, 0 otherwise
voice.encode("output.mp3", (dur) => console.log(dur));
// Output: "10.290"

Options

Javascript Object to set options for the output file

Parameter Description
format Format to be encoded/decoded (silk, webm, mp3, m4a...), default parse from output
bitrate Bitrate of the output, bps unit
frequency Frequency of the output, Hz unit
channels Channels of the output, default to 1

File types

Decode: Tested on mp3, m4a, wav, pcm
Encode: Tested on silk, silk_amr, webm

Todo

  • Use options as parameter instead of multiple arguments
  • Timeout to stop the convert process if it takes too long
  • Batch conversion using command line
  • Support Windows

Installing build tools

OS Command
Ubuntu sudo apt-get install build-essential
CentOS sudo yum groupinstall 'Development Tools'
Mac Download XCode

Installing ffmpeg

Ubuntu

$ sudo add-apt-repository ppa:mc3man/trusty-media  
$ sudo apt-get update  
$ sudo apt-get install ffmpeg

CentOS

$ sudo yum install epel-release
$ sudo yum update
$ sudo rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro

For CentOS 7:

$ sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm

For CentOS 6:

$ sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm

Install FFMPEG:

$ sudo yum install ffmpeg

Mac

$ brew install ffmpeg

License

MIT © Ang YC

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Convert audio files between Tencent apps (Weixin / Wechat, QQ) and Silk codec with other general formats such as MP3 and M4A

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