really really really messy implementation of prism

src/client/voice/VoiceConnection.js

@@ -5,6 +5,7 @@ const AudioPlayer = require('./player/AudioPlayer');
 const VoiceReceiver = require('./receiver/VoiceReceiver');
 const EventEmitter = require('events').EventEmitter;
 const fs = require('fs');
+const Prism = require('prism-media');
 
 /**
  * Represents a connection to a voice channel in Discord.
@@ -26,6 +27,11 @@ class VoiceConnection extends EventEmitter {
      */
     this.voiceManager = pendingConnection.voiceManager;
 
+    /**
+     * The audio transcoder for this connection
+     */
+    this.prism = new Prism();
+
     /**
      * The voice channel this connection is currently serving
      * @type {VoiceChannel}

src/client/voice/dispatcher/StreamDispatcher.js

@@ -16,17 +16,10 @@ nonce.fill(0);
  * @extends {EventEmitter}
  */
 class StreamDispatcher extends EventEmitter {
-  constructor(player, stream, sd, streamOptions) {
+  constructor(player, stream, streamOptions) {
     super();
     this.player = player;
     this.stream = stream;
-    this.streamingData = {
-      channels: 2,
-      count: 0,
-      sequence: sd.sequence,
-      timestamp: sd.timestamp,
-      pausedTime: 0,
-    };
     this._startStreaming();
     this._triggered = false;
     this._volume = streamOptions.volume;
@@ -47,6 +40,10 @@ class StreamDispatcher extends EventEmitter {
     this.setVolume(streamOptions.volume || 1);
   }
 
+  get streamingData() {
+    return this.player.streamingData;
+  }
+
   /**
    * How long the stream dispatcher has been "speaking" for
    * @type {number}

src/client/voice/pcm/ConverterEngine.js

@@ -1,14 +0,0 @@
-const EventEmitter = require('events').EventEmitter;
-
-class ConverterEngine extends EventEmitter {
-  constructor(player) {
-    super();
-    this.player = player;
-  }
-
-  createConvertStream() {
-    return;
-  }
-}
-
-module.exports = ConverterEngine;

src/client/voice/pcm/ConverterEngineList.js

@@ -1 +0,0 @@
-exports.fetch = () => require('./FfmpegConverterEngine');

src/client/voice/pcm/FfmpegConverterEngine.js

@@ -1,86 +0,0 @@
-const ConverterEngine = require('./ConverterEngine');
-const ChildProcess = require('child_process');
-const EventEmitter = require('events').EventEmitter;
-
-class PCMConversionProcess extends EventEmitter {
-  constructor(process) {
-    super();
-    this.process = process;
-    this.input = null;
-    this.process.on('error', e => this.emit('error', e));
-  }
-
-  setInput(stream) {
-    this.input = stream;
-    stream.pipe(this.process.stdin, { end: false });
-    this.input.on('error', e => this.emit('error', e));
-    this.process.stdin.on('error', e => this.emit('error', e));
-  }
-
-  destroy() {
-    this.emit('debug', 'destroying a ffmpeg process:');
-    if (this.input && this.input.unpipe && this.process.stdin) {
-      this.input.unpipe(this.process.stdin);
-      this.emit('unpiped the user input stream from the process input stream');
-    }
-    if (this.process.stdin) {
-      this.process.stdin.end();
-      this.emit('ended the process stdin');
-    }
-    if (this.process.stdin.destroy) {
-      this.process.stdin.destroy();
-      this.emit('destroyed the process stdin');
-    }
-    if (this.process.kill) {
-      this.process.kill();
-      this.emit('killed the process');
-    }
-  }
-
-}
-
-class FfmpegConverterEngine extends ConverterEngine {
-  constructor(player) {
-    super(player);
-    this.command = chooseCommand();
-  }
-
-  handleError(encoder, err) {
-    if (encoder.destroy) encoder.destroy();
-    this.emit('error', err);
-  }
-
-  createConvertStream(seek = 0) {
-    super.createConvertStream();
-    const encoder = ChildProcess.spawn(this.command, [
-      '-analyzeduration', '0',
-      '-loglevel', '0',
-      '-i', '-',
-      '-f', 's16le',
-      '-ar', '48000',
-      '-ac', '2',
-      '-ss', String(seek),
-      'pipe:1',
-    ], { stdio: ['pipe', 'pipe', 'ignore'] });
-    return new PCMConversionProcess(encoder);
-  }
-}
-
-function chooseCommand() {
-  for (const cmd of [
-    'ffmpeg',
-    'avconv',
-    './ffmpeg',
-    './avconv',
-    'node_modules\\ffmpeg-binaries\\bin\\ffmpeg',
-    'node_modules/ffmpeg-binaries/bin/ffmpeg',
-  ]) {
-    if (!ChildProcess.spawnSync(cmd, ['-h']).error) return cmd;
-  }
-  throw new Error(
-    'FFMPEG was not found on your system, so audio cannot be played. ' +
-    'Please make sure FFMPEG is installed and in your PATH.'
-  );
-}
-
-module.exports = FfmpegConverterEngine;

src/client/voice/player/AudioPlayer.js

@@ -1,30 +1,24 @@
-const PCMConverters = require('../pcm/ConverterEngineList');
-const OpusEncoders = require('../opus/OpusEngineList');
 const EventEmitter = require('events').EventEmitter;
+const Prism = require('prism-media');
 const StreamDispatcher = require('../dispatcher/StreamDispatcher');
+const Collection = require('../../../util/Collection');
+const OpusEncoders = require('../opus/OpusEngineList');
+
+const ffmpegArguments = [
+  '-analyzeduration', '0',
+  '-loglevel', '0',
+  '-f', 's16le',
+  '-ar', '48000',
+  '-ac', '2',
+];
 
-/**
- * Represents the Audio Player of a Voice Connection
- * @extends {EventEmitter}
- * @private
- */
 class AudioPlayer extends EventEmitter {
   constructor(voiceConnection) {
     super();
-    /**
-     * The voice connection the player belongs to
-     * @type {VoiceConnection}
-     */
     this.voiceConnection = voiceConnection;
-    this.audioToPCM = new (PCMConverters.fetch())();
+    this.prism = new Prism();
     this.opusEncoder = OpusEncoders.fetch();
-    this.currentConverter = null;
-    /**
-     * The current stream dispatcher, if a stream is being played
-     * @type {StreamDispatcher}
-     */
-    this.dispatcher = null;
-    this.audioToPCM.on('error', e => this.emit('error', e));
+    this.transcoders = new Collection();
     this.streamingData = {
       channels: 2,
       count: 0,
@@ -32,49 +26,38 @@ class AudioPlayer extends EventEmitter {
       timestamp: 0,
       pausedTime: 0,
     };
-    this.voiceConnection.on('closing', () => this.cleanup(null, 'voice connection closing'));
+  }
+
+  get currentTranscoder() {
+    return this.transcoders.last();
+  }
+
+  destroyAllTranscoders(exceptLatest) {
+    for (const stream of this.transcoders.keys()) {
+      const transcoder = this.transcoders.get(stream);
+      if (exceptLatest && transcoder === this.currentTranscoder) continue;
+      transcoder.kill();
+    }
   }
 
   playUnknownStream(stream, { seek = 0, volume = 1, passes = 1 } = {}) {
     const options = { seek, volume, passes };
-    stream.on('end', () => {
-      this.emit('debug', 'Input stream to converter has ended');
+    const transcoder = this.prism.transcode({
+      type: 'ffmpeg',
+      media: stream,
+      ffmpegArguments,
     });
-    stream.on('error', e => this.emit('error', e));
-    const conversionProcess = this.audioToPCM.createConvertStream(options.seek);
-    conversionProcess.on('error', e => this.emit('error', e));
-    conversionProcess.setInput(stream);
-    return this.playPCMStream(conversionProcess.process.stdout, conversionProcess, options);
+    this.transcoders.set(stream, transcoder);
+    this.playPCMStream(transcoder.output, options);
   }
 
-  cleanup(checkStream, reason) {
-    // cleanup is a lot less aggressive than v9 because it doesn't try to kill every single stream it is aware of
-    this.emit('debug', `Clean up triggered due to ${reason}`);
-    const filter = checkStream && this.dispatcher && this.dispatcher.stream === checkStream;
-    if (this.currentConverter && (checkStream ? filter : true)) {
-      this.currentConverter.destroy();
-      this.currentConverter = null;
-    }
-  }
-
-  playPCMStream(stream, converter, { seek = 0, volume = 1, passes = 1 } = {}) {
+  playPCMStream(stream, { seek = 0, volume = 1, passes = 1 } = {}) {
     const options = { seek, volume, passes };
-    stream.on('end', () => this.emit('debug', 'PCM input stream ended'));
-    this.cleanup(null, 'outstanding play stream');
-    this.currentConverter = converter;
-    if (this.dispatcher) {
-      this.streamingData = this.dispatcher.streamingData;
-    }
-    stream.on('error', e => this.emit('error', e));
-    const dispatcher = new StreamDispatcher(this, stream, this.streamingData, options);
-    dispatcher.on('error', e => this.emit('error', e));
-    dispatcher.on('end', () => this.cleanup(dispatcher.stream, 'dispatcher ended'));
+    this.destroyAllTranscoders(true);
+    const dispatcher = new StreamDispatcher(this, stream, options);
     dispatcher.on('speaking', value => this.voiceConnection.setSpeaking(value));
-    this.dispatcher = dispatcher;
-    dispatcher.on('debug', m => this.emit('debug', `Stream dispatch - ${m}`));
     return dispatcher;
   }
-
 }
 
 module.exports = AudioPlayer;

src/client/voice/player/AudioPlayer.old.js

@@ -0,0 +1,100 @@
+const OpusEncoders = require('../opus/OpusEngineList');
+const EventEmitter = require('events').EventEmitter;
+const StreamDispatcher = require('../dispatcher/StreamDispatcher');
+
+const ffmpegArguments = [
+  '-analyzeduration', '0',
+  '-loglevel', '0',
+  '-f', 's16le',
+  '-ar', '48000',
+  '-ac', '2',
+];
+
+/**
+ * Represents the Audio Player of a Voice Connection
+ * @extends {EventEmitter}
+ * @private
+ */
+class AudioPlayer extends EventEmitter {
+  constructor(voiceConnection) {
+    super();
+    /**
+     * The voice connection the player belongs to
+     * @type {VoiceConnection}
+     */
+    this.voiceConnection = voiceConnection;
+    this.opusEncoder = OpusEncoders.fetch();
+    this.currentConverter = null;
+    /**
+     * The current stream dispatcher, if a stream is being played
+     * @type {StreamDispatcher}
+     */
+    this.dispatcher = null;
+    // this.prism.on('error', e => this.emit('error', e));
+    this.streamingData = {
+      channels: 2,
+      count: 0,
+      sequence: 0,
+      timestamp: 0,
+      pausedTime: 0,
+    };
+    this.voiceConnection.on('closing', () => this.cleanup(null, 'voice connection closing'));
+  }
+
+  get prism() {
+    return this.voiceConnection.prism;
+  }
+
+  playUnknownStream(stream, { seek = 0, volume = 1, passes = 1 } = {}) {
+    const options = { seek, volume, passes };
+    const transcoder = this.prism.transcode({
+      type: 'ffmpeg',
+      media: stream,
+      ffmpegArguments,
+    });
+    this.playPCMStream(transcoder.output, options);
+  }
+
+  /*playUnknownStream(stream, { seek = 0, volume = 1, passes = 1 } = {}) {
+    const options = { seek, volume, passes };
+    stream.on('end', () => {
+      this.emit('debug', 'Input stream to converter has ended');
+    });
+    stream.on('error', e => this.emit('error', e));
+    const conversionProcess = this.audioToPCM.createConvertStream(options.seek);
+    conversionProcess.on('error', e => this.emit('error', e));
+    conversionProcess.setInput(stream);
+    return this.playPCMStream(conversionProcess.process.stdout, conversionProcess, options);
+}*/
+
+  cleanup(checkStream, reason) {
+    // cleanup is a lot less aggressive than v9 because it doesn't try to kill every single stream it is aware of
+    this.emit('debug', `Clean up triggered due to ${reason}`);
+    const filter = checkStream && this.dispatcher && this.dispatcher.stream === checkStream;
+    if (this.currentConverter && (checkStream ? filter : true)) {
+      this.currentConverter.destroy();
+      this.currentConverter = null;
+    }
+  }
+
+  playPCMStream(stream, converter, { seek = 0, volume = 1, passes = 1 } = {}) {
+    const options = { seek, volume, passes };
+    stream.on('end', () => this.emit('debug', 'PCM input stream ended'));
+    this.cleanup(null, 'outstanding play stream');
+    this.currentConverter = converter;
+    if (this.dispatcher) {
+      this.streamingData = this.dispatcher.streamingData;
+    }
+    stream.on('error', e => this.emit('error', e));
+    const dispatcher = new StreamDispatcher(this, stream, this.streamingData, options);
+    dispatcher.on('error', e => this.emit('error', e));
+    dispatcher.on('end', () => this.cleanup(dispatcher.stream, 'dispatcher ended'));
+    dispatcher.on('speaking', value => this.voiceConnection.setSpeaking(value));
+    this.dispatcher = dispatcher;
+    dispatcher.on('debug', m => this.emit('debug', `Stream dispatch - ${m}`));
+    return dispatcher;
+  }
+
+}
+
+module.exports = AudioPlayer;