feat: use vhs-utils

Author: brandonocasey

lib/aac/utils.js

@@ -24,49 +24,8 @@ var ADTS_SAMPLING_FREQUENCIES = [
   7350
 ];
 
-var parseId3TagSize = function(header, byteIndex) {
-  var
-    returnSize = (header[byteIndex + 6] << 21) |
-                 (header[byteIndex + 7] << 14) |
-                 (header[byteIndex + 8] << 7) |
-                 (header[byteIndex + 9]),
-    flags = header[byteIndex + 5],
-    footerPresent = (flags & 16) >> 4;
-
-  // if we get a negative returnSize clamp it to 0
-  returnSize = returnSize >= 0 ? returnSize : 0;
-
-  if (footerPresent) {
-    return returnSize + 20;
-  }
-  return returnSize + 10;
-};
-
-var getId3Offset = function(data, offset) {
-  if (data.length - offset < 10 ||
-      data[offset] !== 'I'.charCodeAt(0) ||
-      data[offset + 1] !== 'D'.charCodeAt(0) ||
-      data[offset + 2] !== '3'.charCodeAt(0)) {
-    return offset;
-  }
-
-  offset += parseId3TagSize(data, offset);
-
-  return getId3Offset(data, offset);
-};
-
-
-// TODO: use vhs-utils
-var isLikelyAacData = function(data) {
-  var offset = getId3Offset(data, 0);
-
-  return data.length >= offset + 2 &&
-    (data[offset] & 0xFF) === 0xFF &&
-    (data[offset + 1] & 0xF0) === 0xF0 &&
-    // verify that the 2 layer bits are 0, aka this
-    // is not mp3 data but aac data.
-    (data[offset + 1] & 0x16) === 0x10;
-};
+var {isLikely} = require('@videojs/vhs-utils/cjs/containers.js');
+var {getId3Size} = require('@videojs/vhs-utils/cjs/id3-helpers.js');
 
 var parseSyncSafeInteger = function(data) {
   return (data[0] << 21) |
@@ -182,8 +141,8 @@ var parseAacTimestamp = function(packet) {
 };
 
 module.exports = {
-  isLikelyAacData: isLikelyAacData,
-  parseId3TagSize: parseId3TagSize,
+  isLikelyAacData: isLikely.aac,
+  parseId3TagSize: getId3Size,
   parseAdtsSize: parseAdtsSize,
   parseType: parseType,
   parseSampleRate: parseSampleRate,

lib/mp4/caption-parser.js

@@ -11,7 +11,7 @@
 
 var discardEmulationPreventionBytes = require('../tools/caption-packet-parser').discardEmulationPreventionBytes;
 var CaptionStream = require('../m2ts/caption-stream').CaptionStream;
-var findBox = require('../mp4/find-box.js');
+var {findBox} = require('@videojs/vhs-utils/cjs/mp4-helpers.js');
 var parseTfdt = require('../tools/parse-tfdt.js');
 var parseTrun = require('../tools/parse-trun.js');
 var parseTfhd = require('../tools/parse-tfhd.js');

lib/mp4/probe.js

@@ -10,7 +10,7 @@
 
 var toUnsigned = require('../utils/bin').toUnsigned;
 var toHexString = require('../utils/bin').toHexString;
-var findBox = require('../mp4/find-box.js');
+var {findBox, parseTracks} = require('@videojs/vhs-utils/cjs/mp4-helpers.js');
 var parseType = require('../mp4/parse-type.js');
 var parseTfhd = require('../tools/parse-tfhd.js');
 var parseTrun = require('../tools/parse-trun.js');
@@ -36,6 +36,7 @@ var timescale, startTime, compositionStartTime, getVideoTrackIds, getTracks,
  * @return {object} a hash of track ids to timescale values or null if
  * the init segment is malformed.
  */
+// TODO: remove in a major version
 timescale = function(init) {
   var
     result = {},
@@ -208,6 +209,7 @@ compositionStartTime = function(timescales, fragment) {
   *
   * @see ISO-BMFF-12/2015, Section 8.4.3
  **/
+// TODO: remove in major version.
 getVideoTrackIds = function(init) {
   var traks = findBox(init, ['moov', 'trak']);
   var videoTrackIds = [];
@@ -236,6 +238,7 @@ getVideoTrackIds = function(init) {
   return videoTrackIds;
 };
 
+// TODO: remove in major version
 getTimescaleFromMediaHeader = function(mdhd) {
   // mdhd is a FullBox, meaning it will have its own version as the first byte
   var version = mdhd[0];
@@ -254,100 +257,10 @@ getTimescaleFromMediaHeader = function(mdhd) {
  * mp4 segment
  */
 getTracks = function(init) {
-  var traks = findBox(init, ['moov', 'trak']);
-  var tracks = [];
-
-  traks.forEach(function(trak) {
-    var track = {};
-    var tkhd = findBox(trak, ['tkhd'])[0];
-    var view, tkhdVersion;
-
-    // id
-    if (tkhd) {
-      view = new DataView(tkhd.buffer, tkhd.byteOffset, tkhd.byteLength);
-      tkhdVersion = view.getUint8(0);
-
-      track.id = (tkhdVersion === 0) ? view.getUint32(12) : view.getUint32(20);
-    }
-
-    var hdlr = findBox(trak, ['mdia', 'hdlr'])[0];
-
-    // type
-    if (hdlr) {
-      var type = parseType(hdlr.subarray(8, 12));
-
-      if (type === 'vide') {
-        track.type = 'video';
-      } else if (type === 'soun') {
-        track.type = 'audio';
-      } else {
-        track.type = type;
-      }
-    }
-
-
-    // codec
-    var stsd = findBox(trak, ['mdia', 'minf', 'stbl', 'stsd'])[0];
-
-    if (stsd) {
-      var sampleDescriptions = stsd.subarray(8);
-      // gives the codec type string
-      track.codec = parseType(sampleDescriptions.subarray(4, 8));
-
-      var codecBox = findBox(sampleDescriptions, [track.codec])[0];
-      var codecConfig, codecConfigType;
-
-      if (codecBox) {
-        // https://tools.ietf.org/html/rfc6381#section-3.3
-        if ((/^[a-z]vc[1-9]$/i).test(track.codec)) {
-          // we don't need anything but the "config" parameter of the
-          // avc1 codecBox
-          codecConfig = codecBox.subarray(78);
-          codecConfigType = parseType(codecConfig.subarray(4, 8));
-
-          if (codecConfigType === 'avcC' && codecConfig.length > 11) {
-            track.codec += '.';
-
-            // left padded with zeroes for single digit hex
-            // profile idc
-            track.codec +=  toHexString(codecConfig[9]);
-            // the byte containing the constraint_set flags
-            track.codec += toHexString(codecConfig[10]);
-            // level idc
-            track.codec += toHexString(codecConfig[11]);
-          } else {
-            // TODO: show a warning that we couldn't parse the codec
-            // and are using the default
-            track.codec = 'avc1.4d400d';
-          }
-        } else if ((/^mp4[a,v]$/i).test(track.codec)) {
-          // we do not need anything but the streamDescriptor of the mp4a codecBox
-          codecConfig = codecBox.subarray(28);
-          codecConfigType = parseType(codecConfig.subarray(4, 8));
-
-          if (codecConfigType === 'esds' && codecConfig.length > 20 && codecConfig[19] !== 0) {
-            track.codec += '.' + toHexString(codecConfig[19]);
-            // this value is only a single digit
-            track.codec += '.' + toHexString((codecConfig[20] >>> 2) & 0x3f).replace(/^0/, '');
-          } else {
-            // TODO: show a warning that we couldn't parse the codec
-            // and are using the default
-            track.codec = 'mp4a.40.2';
-          }
-        } else {
-          // flac, opus, etc
-          track.codec = track.codec.toLowerCase();
-        }
-      }
-    }
-
-    var mdhd = findBox(trak, ['mdia', 'mdhd'])[0];
-
-    if (mdhd) {
-      track.timescale = getTimescaleFromMediaHeader(mdhd);
-    }
+  var tracks = parseTracks(init, false);
 
-    tracks.push(track);
+  tracks.forEach(function(track) {
+    track.id = track.number;
   });
 
   return tracks;

lib/partial/transmuxer.js

@@ -10,10 +10,7 @@ var AacStream = require('../aac/index');
 var clock = require('../utils/clock');
 
 var createPipeline = function(object) {
-  object.prototype = new Stream();
-  object.prototype.init.call(object);
-
-  return object;
+  return Object.assign(new Stream(), object);
 };
 
 var tsPipeline = function(options) {

lib/tools/mp4-inspector.js

@@ -16,7 +16,7 @@ var
     return new Date(seconds * 1000 - 2082844800000);
   },
   parseType = require('../mp4/parse-type'),
-  findBox = require('../mp4/find-box'),
+  {findBox} = require('@videojs/vhs-utils/cjs/mp4-helpers.js'),
   nalParse = function(avcStream) {
     var
       avcView = new DataView(avcStream.buffer, avcStream.byteOffset, avcStream.byteLength),

lib/utils/stream.js

@@ -8,78 +8,12 @@
  * Objects that inherit from streams should call init in their constructors.
  */
 'use strict';
+var Stream = require('@videojs/vhs-utils/cjs/stream');
 
-var Stream = function() {
-  this.init = function() {
-    var listeners = {};
-    /**
-     * Add a listener for a specified event type.
-     * @param type {string} the event name
-     * @param listener {function} the callback to be invoked when an event of
-     * the specified type occurs
-     */
-    this.on = function(type, listener) {
-      if (!listeners[type]) {
-        listeners[type] = [];
-      }
-      listeners[type] = listeners[type].concat(listener);
-    };
-    /**
-     * Remove a listener for a specified event type.
-     * @param type {string} the event name
-     * @param listener {function} a function previously registered for this
-     * type of event through `on`
-     */
-    this.off = function(type, listener) {
-      var index;
-      if (!listeners[type]) {
-        return false;
-      }
-      index = listeners[type].indexOf(listener);
-      listeners[type] = listeners[type].slice();
-      listeners[type].splice(index, 1);
-      return index > -1;
-    };
-    /**
-     * Trigger an event of the specified type on this stream. Any additional
-     * arguments to this function are passed as parameters to event listeners.
-     * @param type {string} the event name
-     */
-    this.trigger = function(type) {
-      var callbacks, i, length, args;
-      callbacks = listeners[type];
-      if (!callbacks) {
-        return;
-      }
-      // Slicing the arguments on every invocation of this method
-      // can add a significant amount of overhead. Avoid the
-      // intermediate object creation for the common case of a
-      // single callback argument
-      if (arguments.length === 2) {
-        length = callbacks.length;
-        for (i = 0; i < length; ++i) {
-          callbacks[i].call(this, arguments[1]);
-        }
-      } else {
-        args = [];
-        i = arguments.length;
-        for (i = 1; i < arguments.length; ++i) {
-          args.push(arguments[i]);
-        }
-        length = callbacks.length;
-        for (i = 0; i < length; ++i) {
-          callbacks[i].apply(this, args);
-        }
-      }
-    };
-    /**
-     * Destroys the stream and cleans up.
-     */
-    this.dispose = function() {
-      listeners = {};
-    };
-  };
-};
+var MuxStream = function() {};
+
+MuxStream.prototype = new Stream();
+MuxStream.prototype.init = MuxStream.prototype.constructor;
 
 /**
  * Forwards all `data` events on this stream to the destination stream. The
@@ -90,7 +24,7 @@ var Stream = function() {
  *                            when the current stream emits a 'done' event
  * @see http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options
  */
-Stream.prototype.pipe = function(destination) {
+MuxStream.prototype.pipe = function(destination) {
   this.on('data', function(data) {
     destination.push(data);
   });
@@ -118,24 +52,24 @@ Stream.prototype.pipe = function(destination) {
 // actual work. These are provided by the prototype as a sort of no-op
 // implementation so that we don't have to check for their existence in the
 // `pipe` function above.
-Stream.prototype.push = function(data) {
+MuxStream.prototype.push = function(data) {
   this.trigger('data', data);
 };
 
-Stream.prototype.flush = function(flushSource) {
+MuxStream.prototype.flush = function(flushSource) {
   this.trigger('done', flushSource);
 };
 
-Stream.prototype.partialFlush = function(flushSource) {
+MuxStream.prototype.partialFlush = function(flushSource) {
   this.trigger('partialdone', flushSource);
 };
 
-Stream.prototype.endTimeline = function(flushSource) {
+MuxStream.prototype.endTimeline = function(flushSource) {
   this.trigger('endedtimeline', flushSource);
 };
 
-Stream.prototype.reset = function(flushSource) {
+MuxStream.prototype.reset = function(flushSource) {
   this.trigger('reset', flushSource);
 };
 
-module.exports = Stream;
+module.exports = MuxStream;