1 files changed, 83 insertions, 0 deletions
diff --git a/devtools/shared/fronts/webaudio.js b/devtools/shared/fronts/webaudio.js
new file mode 100644
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+++ b/devtools/shared/fronts/webaudio.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const {
+  audionodeSpec,
+  webAudioSpec,
+  AUTOMATION_METHODS,
+  NODE_CREATION_METHODS,
+  NODE_ROUTING_METHODS,
+} = require("devtools/shared/specs/webaudio");
+const protocol = require("devtools/shared/protocol");
+const AUDIO_NODE_DEFINITION = require("devtools/server/actors/utils/audionodes.json");
+
+/**
+ * The corresponding Front object for the AudioNodeActor.
+ *
+ * @attribute {String} type
+ *            The type of audio node, like "OscillatorNode", "MediaElementAudioSourceNode"
+ * @attribute {Boolean} source
+ *            Boolean indicating if the node is a source node, like BufferSourceNode,
+ *            MediaElementAudioSourceNode, OscillatorNode, etc.
+ * @attribute {Boolean} bypassable
+ *            Boolean indicating if the audio node is bypassable (splitter,
+ *            merger and destination nodes, for example, are not)
+ */
+const AudioNodeFront = protocol.FrontClassWithSpec(audionodeSpec, {
+  form: function (form, detail) {
+    if (detail === "actorid") {
+      this.actorID = form;
+      return;
+    }
+
+    this.actorID = form.actor;
+    this.type = form.type;
+    this.source = form.source;
+    this.bypassable = form.bypassable;
+  },
+
+  initialize: function (client, form) {
+    protocol.Front.prototype.initialize.call(this, client, form);
+    // if we were manually passed a form, this was created manually and
+    // needs to own itself for now.
+    if (form) {
+      this.manage(this);
+    }
+  }
+});
+
+exports.AudioNodeFront = AudioNodeFront;
+
+/**
+ * The corresponding Front object for the WebAudioActor.
+ */
+const WebAudioFront = protocol.FrontClassWithSpec(webAudioSpec, {
+  initialize: function (client, { webaudioActor }) {
+    protocol.Front.prototype.initialize.call(this, client, { actor: webaudioActor });
+    this.manage(this);
+  },
+
+  /**
+   * If connecting to older geckos (<Fx43), where audio node actor's do not
+   * contain `type`, `source` and `bypassable` properties, fetch
+   * them manually here.
+   */
+  _onCreateNode: protocol.preEvent("create-node", function (audionode) {
+    if (!audionode.type) {
+      return audionode.getType().then(type => {
+        audionode.type = type;
+        audionode.source = !!AUDIO_NODE_DEFINITION[type].source;
+        audionode.bypassable = !AUDIO_NODE_DEFINITION[type].unbypassable;
+      });
+    }
+    return null;
+  }),
+});
+
+WebAudioFront.AUTOMATION_METHODS = new Set(AUTOMATION_METHODS);
+WebAudioFront.NODE_CREATION_METHODS = new Set(NODE_CREATION_METHODS);
+WebAudioFront.NODE_ROUTING_METHODS = new Set(NODE_ROUTING_METHODS);
+
+exports.WebAudioFront = WebAudioFront;