support mod_audio_fork pause with silence (#113)

* support mod_audio_fork pause with silence parameter

* support mod_audio_fork pause with silence

* fix review comment

* wip

Author: xquanluu

lib/endpoint.js

@@ -1238,20 +1238,48 @@ class Endpoint extends Emitter {
 
   /**
    * Pause sending audio over the websocket connection
+   * @param {string} [bugname] - bugname to pause
+   * @param {boolean} [silence] - whether to send silence frames while paused, only applied if bugname is specified
    * @param  {function} [callback] - callback invoked when api request completes
    * @return {Promise|Endpoint} returns a Promise if no callback supplied; otherwise
    * a reference to the Endpoint object
    */
-  forkAudioPause(bugname, callback) {
+  forkAudioPause(bugname, silence, callback) {
     const args = [this.uuid, 'pause'];
+
     if (arguments.length === 1) {
-      // If the function is called with 1 argument, could be bugname or callback.
       if (typeof bugname === 'function') {
+        //forkAudioPause(callback)
         callback = bugname;
         bugname = null;
+        silence = false;
+      } else if (typeof bugname === 'boolean') {
+        // forkAudioPause(silence)
+        silence = bugname;
+        bugname = null;
+      } else {
+        // forkAudioPause('my-bugname')
+        silence = false;
       }
+    } else if (arguments.length === 2) {
+      if (typeof silence === 'function') {
+        callback = silence;
+        if (typeof bugname === 'boolean') {
+          // forkAudioPause(true, callback)
+          silence = bugname;
+          bugname = null;
+        } else {
+          // forkAudioPause('my-bugname', callback)
+          silence = false;
+        }
+      }
+      //forkAudioPause('my-bugname', true)
+    }
+    //forkAudioPause('my-bugname', true, callback)
+    if (bugname) {
+      args.push(bugname);
+      args.push(silence ? 'silence' : 'blank');
     }
-    if (bugname) args.push(bugname);
 
     const __x = (callback) => {
       debug(`calling uuid_audio_fork with args ${JSON.stringify(args)}`);

test/endpoint.js

@@ -507,6 +507,28 @@ test.skip('fork audio', (t) => {
       .then((evt) => {
         return ep.forkAudioStop();
       })
+      // pause, resume
+      .then(() => {
+         t.pass('stopped forking audio with no metadata');
+        return ep.forkAudioStart({
+          wsUrl: 'ws://ws-server:3001',
+          mixType: 'stereo',
+          sampling: '16000'
+        });
+      })
+      .then(() => {
+        t.pass('started forking audio with no metadata');
+        return uac.playFile('voicemail/16000/vm-record_message.wav');
+      })
+       .then((evt) => {
+        return ep.forkAudioPause('background_record', true);
+      })
+       .then((evt) => {
+        return ep.forkAudioResume();
+      })
+      .then((evt) => {
+        return ep.forkAudioStop();
+      })
       .then(() => {
         t.pass('stopped forking audio with no metadata');
         return ;