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Normalize playback volume across tracks (#939)
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@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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### Added
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- Muse now normalizes playback volume across tracks. Thanks to @UniversalSuperBox for sponsoring this feature!
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## [2.2.4] - 2023-04-17
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### Fixed
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@ -19,6 +19,7 @@ Muse is a **highly-opinionated midwestern self-hosted** Discord music bot **that
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- ↔️ Autoconverts playlists / artists / albums / songs from Spotify
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- ↗️ Users can add custom shortcuts (aliases)
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- 1️⃣ Muse instance supports multiple guilds
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- 🔊 Normalizes volume across tracks
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- ✍️ Written in TypeScript, easily extendable
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- ❤️ Loyal Packers fan
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@ -1,7 +1,7 @@
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import {VoiceChannel, Snowflake} from 'discord.js';
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import {Readable} from 'stream';
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import hasha from 'hasha';
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import ytdl from 'ytdl-core';
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import ytdl, {videoFormat} from 'ytdl-core';
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import {WriteStream} from 'fs-capacitor';
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import ffmpeg from 'fluent-ffmpeg';
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import shuffle from 'array-shuffle';
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@ -56,6 +56,8 @@ export interface PlayerEvents {
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statusChange: (oldStatus: STATUS, newStatus: STATUS) => void;
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}
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type YTDLVideoFormat = videoFormat & {loudnessDb?: number};
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export default class {
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public voiceConnection: VoiceConnection | null = null;
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public status = STATUS.PAUSED;
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@ -415,7 +417,7 @@ export default class {
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const ffmpegInputOptions: string[] = [];
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let shouldCacheVideo = false;
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let format: ytdl.videoFormat | undefined;
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let format: YTDLVideoFormat | undefined;
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try {
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ffmpegInput = await this.fileCache.getPathFor(this.getHashForCache(song.url));
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@ -431,7 +433,7 @@ export default class {
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// Not yet cached, must download
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const info = await ytdl.getInfo(song.url);
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const {formats} = info;
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const formats = info.formats as YTDLVideoFormat[];
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const filter = (format: ytdl.videoFormat): boolean => format.codecs === 'opus' && format.container === 'webm' && format.audioSampleRate !== undefined && parseInt(format.audioSampleRate, 10) === 48000;
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@ -465,12 +467,16 @@ export default class {
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}
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}
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debug('Using format', format);
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ffmpegInput = format.url;
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// Don't cache livestreams or long videos
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const MAX_CACHE_LENGTH_SECONDS = 30 * 60; // 30 minutes
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shouldCacheVideo = !info.player_response.videoDetails.isLiveContent && parseInt(info.videoDetails.lengthSeconds, 10) < MAX_CACHE_LENGTH_SECONDS && !options.seek;
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debug(shouldCacheVideo ? 'Caching video' : 'Not caching video');
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ffmpegInputOptions.push(...[
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'-reconnect',
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'1',
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@ -489,7 +495,11 @@ export default class {
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}
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}
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return this.createReadStream(ffmpegInput, {ffmpegInputOptions, cache: shouldCacheVideo});
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return this.createReadStream(ffmpegInput, {
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ffmpegInputOptions,
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cache: shouldCacheVideo,
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volumeAdjustment: format?.loudnessDb ? `${-format.loudnessDb}dB` : undefined,
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});
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}
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private startTrackingPosition(initalPosition?: number): void {
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@ -546,7 +556,7 @@ export default class {
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}
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}
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private async createReadStream(url: string, options: {ffmpegInputOptions?: string[]; cache?: boolean} = {}): Promise<Readable> {
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private async createReadStream(url: string, options: {ffmpegInputOptions?: string[]; cache?: boolean; volumeAdjustment?: string} = {}): Promise<Readable> {
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return new Promise((resolve, reject) => {
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const capacitor = new WriteStream();
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@ -563,6 +573,7 @@ export default class {
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.noVideo()
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.audioCodec('libopus')
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.outputFormat('webm')
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.addOutputOption(['-filter:a', `volume=${options?.volumeAdjustment ?? '1'}`])
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.on('error', error => {
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if (!hasReturnedStreamClosed) {
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reject(error);
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