fix

node_modules/prism-media/src/transcoders/MediaTranscoder.js

@@ -0,0 +1,31 @@
+const Ffmpeg = require('./ffmpeg/Ffmpeg');
+
+const transcoders = [
+  'ffmpeg',
+];
+
+class MediaTranscoder {
+  constructor(prism) {
+    this.prism = prism;
+    this.ffmpeg = new Ffmpeg(this);
+  }
+
+  static verifyOptions(options) {
+    if (!options) throw new Error('Options must be passed to MediaTranscoder.transcode()');
+    if (!options.type) throw new Error('Options.type must be passed to MediaTranscoder.transcode()');
+    if (!transcoders.includes(options.type)) throw new Error(`Options.type must be: ${transcoders.join(' ')}`);
+    return options;
+  }
+
+  /**
+   * Transcodes a media stream based on specified options
+   * @param {Object} options the options to use when transcoding
+   * @returns {ReadableStream} the transcodeed stream
+   */
+  transcode(options) {
+    options = MediaTranscoder.verifyOptions(options);
+    return this[options.type].transcode(options);
+  }
+}
+
+module.exports = MediaTranscoder;

node_modules/prism-media/src/transcoders/ffmpeg/Ffmpeg.js

@@ -0,0 +1,51 @@
+const ChildProcess = require('child_process');
+const FfmpegProcess = require('./FfmpegProcess');
+
+class FfmpegTranscoder {
+  constructor(mediaTranscoder) {
+    this.mediaTranscoder = mediaTranscoder;
+    this.command = FfmpegTranscoder.selectFfmpegCommand();
+    this.processes = [];
+  }
+
+  static verifyOptions(options) {
+    if (!options) throw new Error('Options not provided!');
+    if (!options.media) throw new Error('Media must be provided');
+    if (!options.ffmpegArguments || !(options.ffmpegArguments instanceof Array)) {
+      throw new Error('FFMPEG Arguments must be an array');
+    }
+    if (options.ffmpegArguments.includes('-i')) return options;
+    if (typeof options.media === 'string') {
+      options.ffmpegArguments = ['-i', `${options.media}`].concat(options.ffmpegArguments).concat(['pipe:1']);
+    } else {
+      options.ffmpegArguments = ['-i', '-'].concat(options.ffmpegArguments).concat(['pipe:1']);
+    }
+    return options;
+  }
+
+  /**
+   * Transcodes an input using FFMPEG
+   * @param {FfmpegTranscoderOptions} options the options to use
+   * @returns {FfmpegProcess} the created FFMPEG process
+   * @throws {FFMPEGOptionsError}
+   */
+  transcode(options) {
+    if (!this.command) this.command = FfmpegTranscoder.selectFfmpegCommand();
+    const proc = new FfmpegProcess(this, FfmpegTranscoder.verifyOptions(options));
+    this.processes.push(proc);
+    return proc;
+  }
+
+  static selectFfmpegCommand() {
+    try {
+      return require('ffmpeg-binaries');
+    } catch (err) {
+      for (const command of ['ffmpeg', 'avconv', './ffmpeg', './avconv']) {
+        if (!ChildProcess.spawnSync(command, ['-h']).error) return command;
+      }
+      throw new Error('FFMPEG not found');
+    }
+  }
+}
+
+module.exports = FfmpegTranscoder;

node_modules/prism-media/src/transcoders/ffmpeg/FfmpegProcess.js

@@ -0,0 +1,95 @@
+const EventEmitter = require('events').EventEmitter;
+const ChildProcess = require('child_process');
+
+/**
+ * A spawned FFMPEG process
+ */
+class FfmpegProcess extends EventEmitter {
+  constructor(ffmpegTranscoder, options) {
+    super();
+    /**
+     * The ffmpeg process
+     * @type {ChildProcess}
+     */
+    this.process = ChildProcess.spawn(ffmpegTranscoder.command, options.ffmpegArguments);
+    /**
+     * The FFMPEG transcoder that created this process
+     * @type {FfmpegTranscoder}
+     */
+    this.transcoder = ffmpegTranscoder;
+    /**
+     * The input media
+     * @type {?ReadableStream|string}
+     */
+    this.inputMedia = options.media;
+
+    if (typeof this.inputMedia !== 'string') {
+      try {
+        this.connectStream(this.inputMedia);
+      } catch (e) {
+        this.emit('error', e, 'instantiation');
+      }
+    } else {
+      this.attachErrorHandlers();
+    }
+
+    this.on('error', this.kill.bind(this));
+    this.once('end', this.kill.bind(this));
+  }
+
+  /**
+   * The ffmpeg output stream
+   * @type {?ReadableStream}
+   */
+  get output() {
+    return this.process ? this.process.stdout : null;
+  }
+
+  attachErrorHandlers() {
+    this.process.stdin.on('error', e => {
+      // if not killed
+      if (this.process) {
+        this.emit('error', e, 'ffmpegProcess.stdin');
+      }
+    });
+    this.process.stdout.on('error', e => {
+      // if not killed
+      if (this.process) {
+        this.emit('error', e, 'ffmpegProcess.stdout');
+      }
+    });
+    this.process.on('error', e => this.emit('error', e, 'ffmpegProcess'));
+    this.process.stdout.on('end', () => this.emit('end'));
+  }
+
+  /**
+   * Connects an input stream to the ffmpeg process
+   * @param {ReadableStream} inputMedia the stream to pass to ffmpeg
+   * @returns {ReadableStream} the ffmpeg output stream
+   */
+  connectStream(inputMedia) {
+    if (!this.process) throw new Error('No FFMPEG process available');
+    this.inputMedia = inputMedia;
+    this.inputMedia.pipe(this.process.stdin, { end: false });
+
+    inputMedia.on('error', e => this.emit('error', e, 'inputstream', inputMedia));
+
+    this.attachErrorHandlers();
+
+    return this.process.stdout;
+  }
+
+  /**
+   * Kills the ffmpeg process
+   */
+  kill() {
+    if (!this.process) return;
+    if (this.inputMedia && this.inputMedia.unpipe) {
+      this.inputMedia.unpipe(this.process.stdin);
+    }
+    this.process.kill('SIGKILL');
+    this.process = null;
+  }
+}
+
+module.exports = FfmpegProcess;