npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

sox-stream

v2.0.6

Published

A stream wrapper around SoX

Downloads

2,457

Readme

sox-stream

A stream wrapper around SoX. Transcode audio streams easily!

Build Status

Why

The other implementations I found felt klunky to use. This module implements a streaming interface. (If you don't know how to use streams, I recommend reading the stream handbook.)

Examples

Simple transcode:

var sox = require('sox-stream')
var fs  = require('fs')

fs.createReadStream('song.wav')
	.pipe( sox({ output: { type: 'flac' } }) )
	.pipe( fs.createWriteStream('song.flac') )

Lower volume:

var sox = require('sox-stream')
var fs  = require('fs')

var src = fs.createReadStream('song.flac')
var lowerVolume = sox({ input: { volume: 0.8 }, output: { type: flac }})
var dest = fs.createWriteStream('song2.flac')

src.pipe(lowerVolume).pipe(dest)

Transcode with options and error handling:

var sox = require('sox-stream')
var fs  = require('fs')

var src = fs.createReadStream('song.ogg')
var transcode = sox({
	output: {
		bits: 16,
		rate: 44100,
		channels: 2,
		type: 'wav'
	}
})
var dest = fs.createWriteStream('song.wav')
src.pipe(transcode).pipe(dest)

transcode.on('error', function (err) {
	console.log('oh no! ' + err.message)
})

API

var sox = require('sox-stream')

var transform = sox(options)

  • options object required - The following parameters are supported:
    • soxPath string optional - The path to SoX. E.g. 'C:\Program Files\Sox\sox.exe'. Defaults to 'sox', which works if the SoX binary is in your path.
    • global object optional - Global SoX options
    • input object optional - These options will be used to interpret the incoming stream.
    • output object required - These options will be used to format the outgoing stream. When an output option isn't supplied, the output file will have the same format as the input file where possible. (Except type, which you must always pass in.)
    • effects string|array of strings/numbers optional
  • Returns transform, a stream to pipe data through. The stream emits 'error' events when there is an error.

options object

An object of options. Every option is optional except options.output.type is required.

If you want an exhaustive list of each SoX option in depth, take a look at the SoX documentation.

Internally, these options are transformed into the command-line arguments passed to a SoX child process.

options.global object|array of strings/numbers

You can supply an array of strings/numbers, or an object that will be transformed into an array of strings/numbers using hash-to-array.

Currently, sox-stream only supports one input file, so some of these options don't really make sense.

| Command(s) | Functionality | |:---------------------------------------------------|:-----------------------------------------------------------------| | { buffer: BYTES } | Set the size of all processing buffers (default 8192) | | { combine: 'concatenate' } | Concatenate all input files (default for sox, rec) | | { combine: 'sequence' } | Sequence all input files (default for play) | | '-m', { m: true }, { combine: 'mix' } | Mix multiple input files (instead of concatenating) | | { combine: 'mix-power' } | Mix to equal power (instead of concatenating) | | '-M', { M: true }, { combine: 'merge' } | Merge multiple input files (instead of concatenating) | | '-T', { T: true }, { combine: 'multiply' } | Multiply samples of corresponding channels from all input files (instead of concatenating) | | '-D', { D: true }, { 'no-dither': true } | Don't dither automatically | | { 'effects-file': FILENAME } | File containing effects and options | | '-G', { G: true }, { guard: true } | Use temporary files to guard against clipping | | { input-buffer: BYTES } | Override the input buffer size (default: same as --buffer; 8192) | | '--norm', { norm: true } | Guard (see --guard) & normalise | | { play-rate-arg: ARG } | Default rate argument for auto-resample with play' | | { plot: 'gnuplot'|'octave' } | Generate script to plot response of filter effect | |{ 'replay-gain': 'track'|'album'|'off' } | Default: 'off' (sox, rec), track (play) | |'-R', { R: true } | Use default random numbers (same on each run of SoX) | |'--single-threaded', { 'single-threaded': true }| Disable parallel effects channels processing | |{ temp: DIRECTORY }` | Specify the directory to use for temporary files |

var transform = sox({
	global: {
		buffer: 4096,
		norm: true,
		'single-threaded': true
	},
	output: { type: 'ogg' }
})

options.input / options.output object|array of strings/numbers

You can supply an array of strings/numbers, or an object that will be transformed into an array of strings/numbers using hash-to-array.

| Input | Output | Command(s) | Functionality | |:-----:|:------:|:-----------------------------------------------------|:----------------------------------------------------------| | ✓ | X | { v: FACTOR }, { volume: FACTOR } | Input file volume adjustment factor (Floating point number between 0 and 1) | | ✓ | X | { ignore-length: true } | Ignore input file length given in header; read to EOF | | ✓ | ✓ | { t: FILETYPE }, { type: FILETYPE } | Audio file type. E.g. 'wav', 'ogg' | | ✓ | ✓ | { e: ENCODING }, { encoding: ENCODING } | ENCODING can be 'signed-integer', 'unsigned-integer', 'floating-point', 'mu-law', 'a-law', 'ima-adpcm', 'ms-adpcm', or 'gsm-full-rate' | | ✓ | ✓ | '-b', { b: BITS }, { bits: BITS } | Encoded sample size in bits, A.K.A. the bit depth. E.g. 16, 24. (Not applicable to complex encodings such as MP3 or GSM.) | | ✓ | ✓ | '-N', { N: true }, { 'reverse-nibbles': true } | Encoded nibble-order | | ✓ | ✓ | '-X', { X: true }, { 'reverse-bits': true } | Encoded bit-order | | ✓ | ✓ | '-L', { endian: 'little' }, { L: true } | Encoded byte-order: Little endian | | ✓ | ✓ | '-B', { endian: 'big' }, { B: true } | Encoded byte-order: Big endian | | ✓ | ✓ | '-x', { endian: 'swap' }, { x: true } | Encoded byte-order: swap means opposite to default | | ✓ | ✓ | { c: CHANNELS }, { channels: CHANNELS } | Number of channels of audio data. E.g. 2 for stereo | | ✓ | ✓ | '--no-glob', { 'no-glob': true } | Don't glob' wildcard match the following filename | | ✓ | ✓ | { r: RATE }, { rate: RATE } | [Sample rate](https://en.wikipedia.org/wiki/Sampling_(signal_processing)#Sampling_rate) of audio. E.g.44100, 48000| | X | ✓ |{ C: FACTOR }, { compression: FACTOR } | Compression factor. (Might be bitrate, depending on the file type.) See [SoX format docs](http://sox.sourceforge.net/soxformat.html) for more info. | | X | ✓ |{ 'add-comment': TEXT } | Append output file comment | | X | ✓ |{ comment: TEXT } | Specify comment text for the output file | | X | ✓ |{ 'comment-file': FILENAME }` | File containing comment text for the output file |

var transform = sox({
	input: [
		[ '--volume', 1.1 ],
		[ '--endian', 'big' ],
		[ '--no-glob' ]
	],
	output: { type: 'ogg' }
})
// same as
var transform = sox({
	input: {
		volume: 1.1,
		endian: 'big',
		'no-glob': true
	],
	output: [
		'--type', 'ogg'
	]
})
// same as
var transform = sox({
	input: '--volume 1.1 --endian big --no-glob',
	output: '--type ogg'
})

options.effects string|array of strings/numbers/arrays

Please see the SoX Documentation on Effects to see all the options.

Pass them into sox-stream like this:

var transform = sox({
	input: { type: 'ogg' },
	output: { type: 'wav' },


	effects: 'speed 1.5 swap'
	// same as
	effects: [
		'speed 1.5 swap'
	]
	// same as
	effects: [
		'speed', 1.5,
		'swap'
	]
	// same as
	effects: [
		[ 'speed', '1.5' ],
		'swap'
	]
})

Install

  • Install SoX. You can download it, or you can do apt-get install sox
  • Install this package with npm: npm install sox-stream

Test

To run the tests, you must have SoX in your PATH. Then run: npm test

I run the tests using SoX 14.4.2, but other versions of SoX should work as well.

Codec Support

FLAC

MP3

License

MIT