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Apache License
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do not modify the License. You may add Your own attribution
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You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
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5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
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6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
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7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
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END OF TERMS AND CONDITIONS
Copyright 2019 - 2020 Amish Shah
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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Unless required by applicable law or agreed to in writing, software
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See the License for the specific language governing permissions and
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[![Logo](https://hydrabolt.me/assets/prism-media-logo.svg)](https://amishshah.github.io/prism-media/)
<div align="center">
[![Build Status](https://travis-ci.org/amishshah/prism-media.svg?branch=master)](https://travis-ci.org/hydrabolt/prism-media)
[![dependencies](https://david-dm.org/amishshah/prism-media/status.svg)](https://david-dm.org/hydrabolt/prism-media)
[![npm](https://img.shields.io/npm/dt/prism-media.svg)](https://www.npmjs.com/package/prism-media)
[![Patreon](https://img.shields.io/badge/donate-patreon-F96854.svg)](https://www.patreon.com/discordjs)
</div>
## What is it?
An easy-to-use stream-based toolkit that you can use for media processing. All the features provided have predictable
abstractions and join together coherently.
```js
// This example will demux and decode an Opus-containing OGG file, and then write it to a file.
const prism = require('prism-media');
const fs = require('fs');
fs.createReadStream('./audio.ogg')
.pipe(new prism.opus.OggDemuxer())
.pipe(new prism.opus.Decoder({ rate: 48000, channels: 2, frameSize: 960 }))
.pipe(fs.createWriteStream('./audio.pcm'));
```
The example above can work with either a native or pure JavaScript Opus decoder - you don't need to worry about changing
your code for whichever you install.
- FFmpeg support (either through npm modules or a normal installation)
- Opus support (native or pure JavaScript)
- Demuxing for WebM/OGG files (no modules required!)
- Volume Altering (no modules required!)
## Dependencies
The following dependencies are all optional, and you should only install one from each category (the first listed in
each category is preferred)
- Opus
- [`@discordjs/opus`](https://github.com/discordjs/opus)
- [`node-opus`](https://github.com/Rantanen/node-opus)
- [`opusscript`](https://github.com/abalabahaha/opusscript)
- FFmpeg
- [`ffmpeg-static`](http://npmjs.com/ffmpeg-static)
- `ffmpeg` from a [normal installation](https://www.ffmpeg.org/download.html)
## Useful Links
- [Documentation](https://amishshah.github.io/prism-media)
- [Examples](https://github.com/amishshah/prism-media/tree/master/examples)
- [Patreon](https://www.patreon.com/discordjs)
## License
> Copyright 2019 - 2022 Amish Shah
>
> Licensed under the Apache License, Version 2.0 (the "License");
> you may not use this file except in compliance with the License.
> You may obtain a copy of the License at
>
> http://www.apache.org/licenses/LICENSE-2.0
>
> Unless required by applicable law or agreed to in writing, software
> distributed under the License is distributed on an "AS IS" BASIS,
> WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> See the License for the specific language governing permissions and
> limitations under the License.

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{
"name": "prism-media",
"version": "1.3.4",
"description": "Easy-to-use stream-based media transcoding",
"main": "src/index.js",
"types": "typings/index.d.ts",
"scripts": {
"lint": "eslint src",
"test": "npm run lint && jest && npm run docs",
"docs": "jsdoc src/** -d docs -R README.md"
},
"repository": {
"type": "git",
"url": "git+https://github.com/hydrabolt/prism-media.git"
},
"keywords": [
"audio",
"media",
"ffmpeg",
"opus",
"pcm",
"webm",
"ogg"
],
"author": "Amish Shah <amish@shah.gg>",
"license": "Apache-2.0",
"bugs": {
"url": "https://github.com/hydrabolt/prism-media/issues"
},
"homepage": "https://github.com/hydrabolt/prism-media#readme",
"devDependencies": {
"eslint": "^8.19.0",
"jest": "^28.1.2",
"jsdoc": "^3.6.10"
},
"jest": {
"testEnvironmentOptions": {
"url": "http://localhost/"
}
},
"peerDependencies": {
"@discordjs/opus": "^0.8.0",
"ffmpeg-static": "^5.0.2 || ^4.2.7 || ^3.0.0 || ^2.4.0",
"node-opus": "^0.3.3",
"opusscript": "^0.0.8"
},
"peerDependenciesMeta": {
"@discordjs/opus": {
"optional": true
},
"node-opus": {
"optional": true
},
"opusscript": {
"optional": true
},
"ffmpeg-static": {
"optional": true
}
},
"files": [
"src/",
"typings/"
]
}

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const ChildProcess = require('child_process');
const { Duplex } = require('stream');
let FFMPEG = {
command: null,
output: null,
};
const VERSION_REGEX = /version (.+) Copyright/mi;
Object.defineProperty(FFMPEG, 'version', {
get() {
return VERSION_REGEX.exec(FFMPEG.output)[1];
},
enumerable: true,
});
/**
* An FFmpeg transform stream that provides an interface to FFmpeg.
* @memberof core
*/
class FFmpeg extends Duplex {
/**
* Creates a new FFmpeg transform stream
* @memberof core
* @param {Object} options Options you would pass to a regular Transform stream, plus an `args` option
* @param {Array<string>} options.args Arguments to pass to FFmpeg
* @param {boolean} [options.shell=false] Whether FFmpeg should be spawned inside a shell
* @example
* // By default, if you don't specify an input (`-i ...`) prism will assume you're piping a stream into it.
* const transcoder = new prism.FFmpeg({
* args: [
* '-analyzeduration', '0',
* '-loglevel', '0',
* '-f', 's16le',
* '-ar', '48000',
* '-ac', '2',
* ]
* });
* const s16le = mp3File.pipe(transcoder);
* const opus = s16le.pipe(new prism.opus.Encoder({ rate: 48000, channels: 2, frameSize: 960 }));
*/
constructor(options = {}) {
super();
this.process = FFmpeg.create({ shell: false, ...options });
const EVENTS = {
readable: this._reader,
data: this._reader,
end: this._reader,
unpipe: this._reader,
finish: this._writer,
drain: this._writer,
};
this._readableState = this._reader._readableState;
this._writableState = this._writer._writableState;
this._copy(['write', 'end'], this._writer);
this._copy(['read', 'setEncoding', 'pipe', 'unpipe'], this._reader);
for (const method of ['on', 'once', 'removeListener', 'removeListeners', 'listeners']) {
this[method] = (ev, fn) => EVENTS[ev] ? EVENTS[ev][method](ev, fn) : Duplex.prototype[method].call(this, ev, fn);
}
const processError = error => this.emit('error', error);
this._reader.on('error', processError);
this._writer.on('error', processError);
}
get _reader() { return this.process.stdout; }
get _writer() { return this.process.stdin; }
_copy(methods, target) {
for (const method of methods) {
this[method] = target[method].bind(target);
}
}
_destroy(err, cb) {
this._cleanup();
return cb ? cb(err) : undefined;
}
_final(cb) {
this._cleanup();
cb();
}
_cleanup() {
if (this.process) {
this.once('error', () => {});
this.process.kill('SIGKILL');
this.process = null;
}
}
/**
* The available FFmpeg information
* @typedef {Object} FFmpegInfo
* @memberof core
* @property {string} command The command used to launch FFmpeg
* @property {string} output The output from running `ffmpeg -h`
* @property {string} version The version of FFmpeg being used, determined from `output`.
*/
/**
* Finds a suitable FFmpeg command and obtains the debug information from it.
* @param {boolean} [force=false] If true, will ignore any cached results and search for the command again
* @returns {FFmpegInfo}
* @throws Will throw an error if FFmpeg cannot be found.
* @example
* const ffmpeg = prism.FFmpeg.getInfo();
*
* console.log(`Using FFmpeg version ${ffmpeg.version}`);
*
* if (ffmpeg.output.includes('--enable-libopus')) {
* console.log('libopus is available!');
* } else {
* console.log('libopus is unavailable!');
* }
*/
static getInfo(force = false) {
if (FFMPEG.command && !force) return FFMPEG;
const sources = [() => {
const ffmpegStatic = require('ffmpeg-static');
return ffmpegStatic.path || ffmpegStatic;
}, 'ffmpeg', 'avconv', './ffmpeg', './avconv'];
for (let source of sources) {
try {
if (typeof source === 'function') source = source();
const result = ChildProcess.spawnSync(source, ['-h'], { windowsHide: true });
if (result.error) throw result.error;
Object.assign(FFMPEG, {
command: source,
output: Buffer.concat(result.output.filter(Boolean)).toString(),
});
return FFMPEG;
} catch (error) {
// Do nothing
}
}
throw new Error('FFmpeg/avconv not found!');
}
/**
* Creates a new FFmpeg instance. If you do not include `-i ...` it will be assumed that `-i -` should be prepended
* to the options and that you'll be piping data into the process.
* @param {String[]} [args=[]] Arguments to pass to FFmpeg
* @returns {ChildProcess}
* @private
* @throws Will throw an error if FFmpeg cannot be found.
*/
static create({ args = [], shell = false } = {}) {
if (!args.includes('-i')) args.unshift('-i', '-');
return ChildProcess.spawn(FFmpeg.getInfo().command, args.concat(['pipe:1']), { windowsHide: true, shell });
}
}
module.exports = FFmpeg;

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// Based on discord.js' old volume system
const { Transform } = require('stream');
/**
* Transforms a stream of PCM volume.
* @memberof core
* @extends TransformStream
*/
class VolumeTransformer extends Transform {
/**
* @memberof core
* @param {Object} options Any optional TransformStream options plus some extra:
* @param {string} options.type The type of transformer: s16le (signed 16-bit little-endian), s16be, s32le, s32be
* @param {number} [options.volume=1] The output volume of the stream
* @example
* // Half the volume of a signed 16-bit little-endian PCM stream
* input
* .pipe(new prism.VolumeTransformer({ type: 's16le', volume: 0.5 }))
* .pipe(writeStream);
*/
constructor(options = {}) {
super(options);
switch (options.type) {
case 's16le':
this._readInt = (buffer, index) => buffer.readInt16LE(index);
this._writeInt = (buffer, int, index) => buffer.writeInt16LE(int, index);
this._bits = 16;
break;
case 's16be':
this._readInt = (buffer, index) => buffer.readInt16BE(index);
this._writeInt = (buffer, int, index) => buffer.writeInt16BE(int, index);
this._bits = 16;
break;
case 's32le':
this._readInt = (buffer, index) => buffer.readInt32LE(index);
this._writeInt = (buffer, int, index) => buffer.writeInt32LE(int, index);
this._bits = 32;
break;
case 's32be':
this._readInt = (buffer, index) => buffer.readInt32BE(index);
this._writeInt = (buffer, int, index) => buffer.writeInt32BE(int, index);
this._bits = 32;
break;
default:
throw new Error('VolumeTransformer type should be one of s16le, s16be, s32le, s32be');
}
this._bytes = this._bits / 8;
this._extremum = Math.pow(2, this._bits - 1);
this.volume = typeof options.volume === 'undefined' ? 1 : options.volume;
this._chunk = Buffer.alloc(0);
}
_readInt(buffer, index) { return index; }
_writeInt(buffer, int, index) { return index; }
_transform(chunk, encoding, done) {
// If the volume is 1, act like a passthrough stream
if (this.volume === 1) {
this.push(chunk);
return done();
}
const { _bytes, _extremum } = this;
chunk = this._chunk = Buffer.concat([this._chunk, chunk]);
if (chunk.length < _bytes) return done();
const complete = Math.floor(chunk.length / _bytes) * _bytes;
for (let i = 0; i < complete; i += _bytes) {
const int = Math.min(_extremum - 1, Math.max(-_extremum, Math.floor(this.volume * this._readInt(chunk, i))));
this._writeInt(chunk, int, i);
}
this._chunk = chunk.slice(complete);
this.push(chunk.slice(0, complete));
return done();
}
_destroy(err, cb) {
super._destroy(err, cb);
this._chunk = null;
}
/**
* Sets the volume relative to the input stream - i.e. 1 is normal, 0.5 is half, 2 is double.
* @param {number} volume The volume that you want to set
*/
setVolume(volume) {
this.volume = volume;
}
/**
* Sets the volume in decibels.
* @param {number} db The decibels
*/
setVolumeDecibels(db) {
this.setVolume(Math.pow(10, db / 20));
}
/**
* Sets the volume so that a perceived value of 0.5 is half the perceived volume etc.
* @param {number} value The value for the volume
*/
setVolumeLogarithmic(value) {
this.setVolume(Math.pow(value, 1.660964));
}
/**
* The current volume of the stream in decibels
* @readonly
* @type {number}
*/
get volumeDecibels() {
return Math.log10(this.volume) * 20;
}
/**
* The current volume of the stream from a logarithmic scale
* @readonly
* @type {number}
*/
get volumeLogarithmic() {
return Math.pow(this.volume, 1 / 1.660964);
}
}
module.exports = VolumeTransformer;

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const { Transform } = require('stream');
/**
* Base class for WebmOpusDemuxer and WebmVorbisDemuxer.
* **You shouldn't directly instantiate this class, use the opus.WebmDemuxer and vorbis.WebmDemuxer
* implementations instead!**
* @memberof core
* @protected
* @extends TransformStream
*/
class WebmBaseDemuxer extends Transform {
/**
* Creates a new Webm demuxer.
* @private
* @memberof core
* @param {Object} [options] options that you would pass to a regular Transform stream.
*/
constructor(options = {}) {
super(Object.assign({ readableObjectMode: true }, options));
this._remainder = null;
this._length = 0;
this._count = 0;
this._skipUntil = null;
this._track = null;
this._incompleteTrack = {};
this._ebmlFound = false;
}
_transform(chunk, encoding, done) {
this._length += chunk.length;
if (this._remainder) {
chunk = Buffer.concat([this._remainder, chunk]);
this._remainder = null;
}
let offset = 0;
if (this._skipUntil && this._length > this._skipUntil) {
offset = this._skipUntil - this._count;
this._skipUntil = null;
} else if (this._skipUntil) {
this._count += chunk.length;
done();
return;
}
let result;
while (result !== TOO_SHORT) {
try {
result = this._readTag(chunk, offset);
} catch (error) {
done(error);
return;
}
if (result === TOO_SHORT) break;
if (result._skipUntil) {
this._skipUntil = result._skipUntil;
break;
}
if (result.offset) offset = result.offset;
else break;
}
this._count += offset;
this._remainder = chunk.slice(offset);
done();
return;
}
/**
* Reads an EBML ID from a buffer.
* @private
* @param {Buffer} chunk the buffer to read from.
* @param {number} offset the offset in the buffer.
* @returns {Object|Symbol} contains an `id` property (buffer) and the new `offset` (number).
* Returns the TOO_SHORT symbol if the data wasn't big enough to facilitate the request.
*/
_readEBMLId(chunk, offset) {
const idLength = vintLength(chunk, offset);
if (idLength === TOO_SHORT) return TOO_SHORT;
return {
id: chunk.slice(offset, offset + idLength),
offset: offset + idLength,
};
}
/**
* Reads a size variable-integer to calculate the length of the data of a tag.
* @private
* @param {Buffer} chunk the buffer to read from.
* @param {number} offset the offset in the buffer.
* @returns {Object|Symbol} contains property `offset` (number), `dataLength` (number) and `sizeLength` (number).
* Returns the TOO_SHORT symbol if the data wasn't big enough to facilitate the request.
*/
_readTagDataSize(chunk, offset) {
const sizeLength = vintLength(chunk, offset);
if (sizeLength === TOO_SHORT) return TOO_SHORT;
const dataLength = expandVint(chunk, offset, offset + sizeLength);
return { offset: offset + sizeLength, dataLength, sizeLength };
}
/**
* Takes a buffer and attempts to read and process a tag.
* @private
* @param {Buffer} chunk the buffer to read from.
* @param {number} offset the offset in the buffer.
* @returns {Object|Symbol} contains the new `offset` (number) and optionally the `_skipUntil` property,
* indicating that the stream should ignore any data until a certain length is reached.
* Returns the TOO_SHORT symbol if the data wasn't big enough to facilitate the request.
*/
_readTag(chunk, offset) {
const idData = this._readEBMLId(chunk, offset);
if (idData === TOO_SHORT) return TOO_SHORT;
const ebmlID = idData.id.toString('hex');
if (!this._ebmlFound) {
if (ebmlID === '1a45dfa3') this._ebmlFound = true;
else throw Error('Did not find the EBML tag at the start of the stream');
}
offset = idData.offset;
const sizeData = this._readTagDataSize(chunk, offset);
if (sizeData === TOO_SHORT) return TOO_SHORT;
const { dataLength } = sizeData;
offset = sizeData.offset;
// If this tag isn't useful, tell the stream to stop processing data until the tag ends
if (typeof TAGS[ebmlID] === 'undefined') {
if (chunk.length > offset + dataLength) {
return { offset: offset + dataLength };
}
return { offset, _skipUntil: this._count + offset + dataLength };
}
const tagHasChildren = TAGS[ebmlID];
if (tagHasChildren) {
return { offset };
}
if (offset + dataLength > chunk.length) return TOO_SHORT;
const data = chunk.slice(offset, offset + dataLength);
if (!this._track) {
if (ebmlID === 'ae') this._incompleteTrack = {};
if (ebmlID === 'd7') this._incompleteTrack.number = data[0];
if (ebmlID === '83') this._incompleteTrack.type = data[0];
if (this._incompleteTrack.type === 2 && typeof this._incompleteTrack.number !== 'undefined') {
this._track = this._incompleteTrack;
}
}
if (ebmlID === '63a2') {
this._checkHead(data);
this.emit('head', data);
} else if (ebmlID === 'a3') {
if (!this._track) throw Error('No audio track in this webm!');
if ((data[0] & 0xF) === this._track.number) {
this.push(data.slice(4));
}
}
return { offset: offset + dataLength };
}
_destroy(err, cb) {
this._cleanup();
return cb ? cb(err) : undefined;
}
_final(cb) {
this._cleanup();
cb();
}
/**
* Cleans up the demuxer when it is no longer required.
* @private
*/
_cleanup() {
this._remainder = null;
this._incompleteTrack = {};
}
}
/**
* A symbol that is returned by some functions that indicates the buffer it has been provided is not large enough
* to facilitate a request.
* @name WebmBaseDemuxer#TOO_SHORT
* @memberof core
* @private
* @type {Symbol}
*/
const TOO_SHORT = WebmBaseDemuxer.TOO_SHORT = Symbol('TOO_SHORT');
/**
* A map that takes a value of an EBML ID in hex string form, with the value being a boolean that indicates whether
* this tag has children.
* @name WebmBaseDemuxer#TAGS
* @memberof core
* @private
* @type {Object}
*/
const TAGS = WebmBaseDemuxer.TAGS = { // value is true if the element has children
'1a45dfa3': true, // EBML
'18538067': true, // Segment
'1f43b675': true, // Cluster
'1654ae6b': true, // Tracks
'ae': true, // TrackEntry
'd7': false, // TrackNumber
'83': false, // TrackType
'a3': false, // SimpleBlock
'63a2': false,
};
module.exports = WebmBaseDemuxer;
function vintLength(buffer, index) {
if (index < 0 || index > buffer.length - 1) {
return TOO_SHORT;
}
let i = 0;
for (; i < 8; i++) if ((1 << (7 - i)) & buffer[index]) break;
i++;
if (index + i > buffer.length) {
return TOO_SHORT;
}
return i;
}
function expandVint(buffer, start, end) {
const length = vintLength(buffer, start);
if (end > buffer.length || length === TOO_SHORT) return TOO_SHORT;
let mask = (1 << (8 - length)) - 1;
let value = buffer[start] & mask;
for (let i = start + 1; i < end; i++) {
value = (value << 8) + buffer[i];
}
return value;
}

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/**
* Core features.
* **You shouldn't prefix imports from this namespace with `core`.**
* @namespace core
*/
module.exports = {
FFmpeg: require('./FFmpeg'),
VolumeTransformer: require('./VolumeTransformer'),
};

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module.exports = {
opus: require('./opus'),
vorbis: require('./vorbis'),
...require('./core'),
};

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const { Transform } = require('stream');
const OGG_PAGE_HEADER_SIZE = 26;
const STREAM_STRUCTURE_VERSION = 0;
const charCode = x => x.charCodeAt(0);
const OGGS_HEADER = Buffer.from([...'OggS'].map(charCode));
const OPUS_HEAD = Buffer.from([...'OpusHead'].map(charCode));
const OPUS_TAGS = Buffer.from([...'OpusTags'].map(charCode));
/**
* Demuxes an Ogg stream (containing Opus audio) to output an Opus stream.
* @extends {TransformStream}
* @memberof opus
*/
class OggDemuxer extends Transform {
/**
* Creates a new OggOpus demuxer.
* @param {Object} [options] options that you would pass to a regular Transform stream.
* @memberof opus
*/
constructor(options = {}) {
super(Object.assign({ readableObjectMode: true }, options));
this._remainder = null;
this._head = null;
this._bitstream = null;
}
_transform(chunk, encoding, done) {
if (this._remainder) {
chunk = Buffer.concat([this._remainder, chunk]);
this._remainder = null;
}
try {
while (chunk) {
const result = this._readPage(chunk);
if (result) chunk = result;
else break;
}
} catch (error) {
done(error);
return;
}
this._remainder = chunk;
done();
}
/**
* Reads a page from a buffer
* @private
* @param {Buffer} chunk the chunk containing the page
* @returns {boolean|Buffer} if a buffer, it will be a slice of the excess data of the original, otherwise it will be
* false and would indicate that there is not enough data to go ahead with reading this page.
*/
_readPage(chunk) {
if (chunk.length < OGG_PAGE_HEADER_SIZE) {
return false;
}
if (!chunk.slice(0, 4).equals(OGGS_HEADER)) {
throw Error(`capture_pattern is not ${OGGS_HEADER}`);
}
if (chunk.readUInt8(4) !== STREAM_STRUCTURE_VERSION) {
throw Error(`stream_structure_version is not ${STREAM_STRUCTURE_VERSION}`);
}
if (chunk.length < 27) return false;
const pageSegments = chunk.readUInt8(26);
if (chunk.length < 27 + pageSegments) return false;
const table = chunk.slice(27, 27 + pageSegments);
const bitstream = chunk.readUInt32BE(14);
let sizes = [], totalSize = 0;
for (let i = 0; i < pageSegments;) {
let size = 0, x = 255;
while (x === 255) {
if (i >= table.length) return false;
x = table.readUInt8(i);
i++;
size += x;
}
sizes.push(size);
totalSize += size;
}
if (chunk.length < 27 + pageSegments + totalSize) return false;
let start = 27 + pageSegments;
for (const size of sizes) {
const segment = chunk.slice(start, start + size);
const header = segment.slice(0, 8);
if (this._head) {
if (header.equals(OPUS_TAGS)) this.emit('tags', segment);
else if (this._bitstream === bitstream) this.push(segment);
} else if (header.equals(OPUS_HEAD)) {
this.emit('head', segment);
this._head = segment;
this._bitstream = bitstream;
} else {
this.emit('unknownSegment', segment);
}
start += size;
}
return chunk.slice(start);
}
_destroy(err, cb) {
this._cleanup();
return cb ? cb(err) : undefined;
}
_final(cb) {
this._cleanup();
cb();
}
/**
* Cleans up the demuxer when it is no longer required.
* @private
*/
_cleanup() {
this._remainder = null;
this._head = null;
this._bitstream = null;
}
}
/**
* Emitted when the demuxer encounters the opus head.
* @event OggDemuxer#head
* @memberof opus
* @param {Buffer} segment a buffer containing the opus head data.
*/
/**
* Emitted when the demuxer encounters opus tags.
* @event OggDemuxer#tags
* @memberof opus
* @param {Buffer} segment a buffer containing the opus tags.
*/
module.exports = OggDemuxer;

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// Partly based on https://github.com/Rantanen/node-opus/blob/master/lib/Encoder.js
const { Transform } = require('stream');
const loader = require('../util/loader');
const CTL = {
BITRATE: 4002,
FEC: 4012,
PLP: 4014,
};
let Opus = {};
function loadOpus(refresh = false) {
if (Opus.Encoder && !refresh) return Opus;
Opus = loader.require([
['@discordjs/opus', opus => ({ Encoder: opus.OpusEncoder })],
['node-opus', opus => ({ Encoder: opus.OpusEncoder })],
['opusscript', opus => ({ Encoder: opus })],
]);
return Opus;
}
const charCode = x => x.charCodeAt(0);
const OPUS_HEAD = Buffer.from([...'OpusHead'].map(charCode));
const OPUS_TAGS = Buffer.from([...'OpusTags'].map(charCode));
// frame size = (channels * rate * frame_duration) / 1000
/**
* Takes a stream of Opus data and outputs a stream of PCM data, or the inverse.
* **You shouldn't directly instantiate this class, see opus.Encoder and opus.Decoder instead!**
* @memberof opus
* @extends TransformStream
* @protected
*/
class OpusStream extends Transform {
/**
* Creates a new Opus transformer.
* @private
* @memberof opus
* @param {Object} [options] options that you would pass to a regular Transform stream
*/
constructor(options = {}) {
if (!loadOpus().Encoder) {
throw Error('Could not find an Opus module! Please install @discordjs/opus, node-opus, or opusscript.');
}
super(Object.assign({ readableObjectMode: true }, options));
if (Opus.name === 'opusscript') {
options.application = Opus.Encoder.Application[options.application];
}
this.encoder = new Opus.Encoder(options.rate, options.channels, options.application);
this._options = options;
this._required = this._options.frameSize * this._options.channels * 2;
}
_encode(buffer) {
return this.encoder.encode(buffer, this._options.frameSize);
}
_decode(buffer) {
return this.encoder.decode(buffer, Opus.name === 'opusscript' ? null : this._options.frameSize);
}
/**
* Returns the Opus module being used - `opusscript`, `node-opus`, or `@discordjs/opus`.
* @type {string}
* @readonly
* @example
* console.log(`Using Opus module ${prism.opus.Encoder.type}`);
*/
static get type() {
return Opus.name;
}
/**
* Sets the bitrate of the stream.
* @param {number} bitrate the bitrate to use use, e.g. 48000
* @public
*/
setBitrate(bitrate) {
(this.encoder.applyEncoderCTL || this.encoder.encoderCTL)
.apply(this.encoder, [CTL.BITRATE, Math.min(128e3, Math.max(16e3, bitrate))]);
}
/**
* Enables or disables forward error correction.
* @param {boolean} enabled whether or not to enable FEC.
* @public
*/
setFEC(enabled) {
(this.encoder.applyEncoderCTL || this.encoder.encoderCTL)
.apply(this.encoder, [CTL.FEC, enabled ? 1 : 0]);
}
/**
* Sets the expected packet loss over network transmission.
* @param {number} [percentage] a percentage (represented between 0 and 1)
*/
setPLP(percentage) {
(this.encoder.applyEncoderCTL || this.encoder.encoderCTL)
.apply(this.encoder, [CTL.PLP, Math.min(100, Math.max(0, percentage * 100))]);
}
_final(cb) {
this._cleanup();
cb();
}
_destroy(err, cb) {
this._cleanup();
return cb ? cb(err) : undefined;
}
/**
* Cleans up the Opus stream when it is no longer needed
* @private
*/
_cleanup() {
if (Opus.name === 'opusscript' && this.encoder) this.encoder.delete();
this.encoder = null;
}
}
/**
* An Opus encoder stream.
*
* Outputs opus packets in [object mode.](https://nodejs.org/api/stream.html#stream_object_mode)
* @extends opus.OpusStream
* @memberof opus
* @example
* const encoder = new prism.opus.Encoder({ frameSize: 960, channels: 2, rate: 48000 });
* pcmAudio.pipe(encoder);
* // encoder will now output Opus-encoded audio packets
*/
class Encoder extends OpusStream {
/**
* Creates a new Opus encoder stream.
* @memberof opus
* @param {Object} options options that you would pass to a regular OpusStream, plus a few more:
* @param {number} options.frameSize the frame size in bytes to use (e.g. 960 for stereo audio at 48KHz with a frame
* duration of 20ms)
* @param {number} options.channels the number of channels to use
* @param {number} options.rate the sampling rate in Hz
*/
constructor(options) {
super(options);
this._buffer = Buffer.alloc(0);
}
_transform(chunk, encoding, done) {
this._buffer = Buffer.concat([this._buffer, chunk]);
let n = 0;
while (this._buffer.length >= this._required * (n + 1)) {
const buf = this._encode(this._buffer.slice(n * this._required, (n + 1) * this._required));
this.push(buf);
n++;
}
if (n > 0) this._buffer = this._buffer.slice(n * this._required);
return done();
}
_destroy(err, cb) {
super._destroy(err, cb);
this._buffer = null;
}
}
/**
* An Opus decoder stream.
*
* Note that any stream you pipe into this must be in
* [object mode](https://nodejs.org/api/stream.html#stream_object_mode) and should output Opus packets.
* @extends opus.OpusStream
* @memberof opus
* @example
* const decoder = new prism.opus.Decoder({ frameSize: 960, channels: 2, rate: 48000 });
* input.pipe(decoder);
* // decoder will now output PCM audio
*/
class Decoder extends OpusStream {
_transform(chunk, encoding, done) {
const signature = chunk.slice(0, 8);
if (signature.equals(OPUS_HEAD)) {
this.emit('format', {
channels: this._options.channels,
sampleRate: this._options.rate,
bitDepth: 16,
float: false,
signed: true,
version: chunk.readUInt8(8),
preSkip: chunk.readUInt16LE(10),
gain: chunk.readUInt16LE(16),
});
return done();
}
if (signature.equals(OPUS_TAGS)) {
this.emit('tags', chunk);
return done();
}
try {
this.push(this._decode(chunk));
} catch (e) {
return done(e);
}
return done();
}
}
module.exports = { Decoder, Encoder };

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const WebmBaseDemuxer = require('../core/WebmBase');
const OPUS_HEAD = Buffer.from([...'OpusHead'].map(x => x.charCodeAt(0)));
/**
* Demuxes a Webm stream (containing Opus audio) to output an Opus stream.
* @extends core.WebmBaseDemuxer
* @memberof opus
* @example
* const fs = require('fs');
* const file = fs.createReadStream('./audio.webm');
* const demuxer = new prism.opus.WebmDemuxer();
* const opus = file.pipe(demuxer);
* // opus is now a ReadableStream in object mode outputting Opus packets
*/
class WebmDemuxer extends WebmBaseDemuxer {
_checkHead(data) {
if (!data.slice(0, 8).equals(OPUS_HEAD)) {
throw Error('Audio codec is not Opus!');
}
}
}
module.exports = WebmDemuxer;

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/**
* Opus features
* @namespace opus
*/
module.exports = {
// Encoder and Decoder
...require('./Opus'),
OggDemuxer: require('./OggDemuxer'),
WebmDemuxer: require('./WebmDemuxer'),
};

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exports.require = function loader(list) {
const errorLog = [];
for (const [name, fn] of list) {
try {
const data = fn(require(name));
data.name = name;
return data;
} catch (e) {
errorLog.push(e);
}
}
throw new Error(errorLog.join('\n'));
};

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node_modules/prism-media/src/vorbis/WebmDemuxer.js generated vendored Normal file
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const WebmBaseDemuxer = require('../core/WebmBase');
const VORBIS_HEAD = Buffer.from([...'vorbis'].map(x => x.charCodeAt(0)));
/**
* Demuxes a Webm stream (containing Vorbis audio) to output a Vorbis stream.
* @memberof vorbis
* @extends core.WebmBaseDemuxer
*/
class WebmDemuxer extends WebmBaseDemuxer {
_checkHead(data) {
if (data.readUInt8(0) !== 2 || !data.slice(4, 10).equals(VORBIS_HEAD)) {
throw Error('Audio codec is not Vorbis!');
}
this.push(data.slice(3, 3 + data.readUInt8(1)));
this.push(data.slice(3 + data.readUInt8(1), 3 + data.readUInt8(1) + data.readUInt8(2)));
this.push(data.slice(3 + data.readUInt8(1) + data.readUInt8(2)));
}
}
module.exports = WebmDemuxer;

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/**
* Vorbis features
* @namespace vorbis
*/
module.exports = {
WebmDemuxer: require('./WebmDemuxer'),
};

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import { Transform } from 'stream';
import { ChildProcess } from 'child_process';
import { Duplex } from 'stream';
import { opus } from './opus';
import { vorbis } from './vorbis';
export interface FFmpegOptions {
args?: string[];
shell?: boolean;
}
export interface FFmpegInfo {
command: string;
info: string;
version: string;
output: string;
}
export class FFmpeg extends Duplex {
public process: ChildProcess;
constructor(options?: FFmpegOptions);
static getInfo(force?: boolean): FFmpegInfo;
}
export interface VolumeOptions {
type: 's16le' | 's16be' | 's32le' | 's32be',
volume?: number
}
export class VolumeTransformer extends Transform {
public volume: number;
constructor(options: VolumeOptions);
public setVolume(volume: number): void;
public setVolumeDecibels(db: number): void;
public setVolumeLogarithmic(value: number): void;
public readonly volumeDecibels: number;
public readonly volumeLogarithmic: number;
}
export { opus, vorbis };

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import { Transform } from 'stream';
interface OpusOptions {
frameSize: number,
channels: number,
rate: number
}
export class OpusStream extends Transform {
public encoder: any; // TODO: type opusscript/node-opus
constructor(options?: OpusOptions);
public static readonly type: 'opusscript' | 'node-opus' | '@discordjs/opus';
public setBitrate(bitrate: number): void;
public setFEC(enabled: boolean): void;
public setPLP(percentage: number): void;
}
export namespace opus {
interface OpusOptions {
frameSize: number,
channels: number,
rate: number
}
export class Encoder extends OpusStream {}
export class Decoder extends OpusStream {}
export class OggDemuxer extends Transform {}
export class WebmDemuxer extends Transform {}
}

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node_modules/prism-media/typings/vorbis.d.ts generated vendored Normal file
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import { Transform } from 'stream';
export namespace vorbis {
export class WebmDemuxer extends Transform {}
}