chrome/browser/ui/app_list/speech_recognizer.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_H_
   6 #define CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/weak_ptr.h"
  11
  12 namespace content {
  13 struct SpeechRecognitionSessionPreamble;
  14 }
  15
  16 namespace net {
  17 class URLRequestContextGetter;
  18 }
  19
  20 namespace app_list {
  21
  22 class SpeechRecognizerDelegate;
  23
  24 // SpeechRecognizer is a wrapper around the speech recognition engine that
  25 // simplifies its use from the UI thread. This class handles all setup/shutdown,
  26 // collection of results, error cases, and threading.
  27 class SpeechRecognizer {
  28  public:
  29   SpeechRecognizer(const base::WeakPtr<SpeechRecognizerDelegate>& delegate,
  30                    net::URLRequestContextGetter* url_request_context_getter,
  31                    const std::string& locale);
  32   ~SpeechRecognizer();
  33
  34   // Start/stop the speech recognizer. |preamble| contains the preamble audio to
  35   // log if auth parameters are available.
  36   // Must be called on the UI thread.
  37   void Start(
  38       const scoped_refptr<content::SpeechRecognitionSessionPreamble>& preamble);
  39   void Stop();
  40
  41  private:
  42   class EventListener;
  43
  44   base::WeakPtr<SpeechRecognizerDelegate> delegate_;
  45   scoped_refptr<EventListener> speech_event_listener_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(SpeechRecognizer);
  48 };
  49
  50 }  // namespace app_list
  51
  52 #endif  // CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_H_