Support for providing media stream audio track to speech recognition

Source/modules/speech/SpeechRecognition.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
 
 void SpeechRecognition::start(ExceptionState& exceptionState)
 {
     ASSERT(m_controller);
     if (m_started) {
         exceptionState.throwDOMException(InvalidStateError, "recognition has already started.");
         return;
     }
 
     m_finalResults.clear();
+
+    if (m_audioTrack)
+        m_controller->setAudioTrack(this, m_audioTrack);
+    else
+        m_controller->clearAudioTrack(this);

[no longer working on chromium, 2014/08/14 15:41:34]

you don't need clearAudioTrack, just do m_controller->setAudioTrack(this,
m_audioTrack) regardless if m_audioTrack is nullptr or not.

[burnik, 2014/08/14 16:35:14]

Done.

+
     m_controller->start(this, m_grammars.get(), m_lang, m_continuous, m_interimResults, m_maxAlternatives);
     m_started = true;
 }
 
 void SpeechRecognition::stopFunction()
 {
     ASSERT(m_controller);
     if (m_started && !m_stopping) {
         m_stopping = true;
         m_controller->stop(this);
@@ skipping 101 matching lines @@
 
 SpeechRecognition::SpeechRecognition(ExecutionContext* context)
     : ActiveDOMObject(context)
     , m_grammars(SpeechGrammarList::create()) // FIXME: The spec is not clear on the default value for the grammars attribute.
     , m_continuous(false)
     , m_interimResults(false)
     , m_maxAlternatives(1)
     , m_controller(nullptr)
     , m_stoppedByActiveDOMObject(false)
     , m_started(false)
     , m_stopping(false)

[no longer working on chromium, 2014/08/14 15:41:34]

initialize m_audioTrack to null here.

[burnik, 2014/08/14 16:38:44]

Done.

 {
     ScriptWrappable::init(this);
     Document* document = toDocument(executionContext());
 
     Page* page = document->page();
     ASSERT(page);
 
     m_controller = SpeechRecognitionController::from(page);
     ASSERT(m_controller);
 
     // FIXME: Need to hook up with Page to get notified when the visibility changes.
 }
 
 SpeechRecognition::~SpeechRecognition()
 {
 }
 
 void SpeechRecognition::trace(Visitor* visitor)
 {
     visitor->trace(m_grammars);
+    visitor->trace(m_audioTrack);
 #if ENABLE(OILPAN)
     visitor->trace(m_controller);
 #endif
     visitor->trace(m_finalResults);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink