content/browser/speech/speech_recognizer_impl_android.h

   1 // Copyright 2013 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 CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_ANDROID_H_
   6 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_ANDROID_H_
   7
   8 #include <jni.h>
   9
  10 #include "base/android/scoped_java_ref.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "content/browser/speech/speech_recognizer.h"
  14 #include "content/public/common/speech_recognition_error.h"
  15 #include "content/public/common/speech_recognition_result.h"
  16
  17 namespace content {
  18
  19 class SpeechRecognitionEventListener;
  20
  21 class CONTENT_EXPORT SpeechRecognizerImplAndroid : public SpeechRecognizer {
  22  public:
  23   SpeechRecognizerImplAndroid(SpeechRecognitionEventListener* listener,
  24                               int session_id);
  25
  26   // SpeechRecognizer methods.
  27   void StartRecognition(const std::string& device_id) override;
  28   void AbortRecognition() override;
  29   void StopAudioCapture() override;
  30   bool IsActive() const override;
  31   bool IsCapturingAudio() const override;
  32
  33   // Called from Java methods via JNI.
  34   void OnAudioStart(JNIEnv* env, jobject obj);
  35   void OnSoundStart(JNIEnv* env, jobject obj);
  36   void OnSoundEnd(JNIEnv* env, jobject obj);
  37   void OnAudioEnd(JNIEnv* env, jobject obj);
  38   void OnRecognitionResults(JNIEnv* env, jobject obj, jobjectArray strings,
  39                             jfloatArray floats, jboolean interim);
  40   void OnRecognitionError(JNIEnv* env, jobject obj, jint error);
  41   void OnRecognitionEnd(JNIEnv* env, jobject obj);
  42
  43   static bool RegisterSpeechRecognizer(JNIEnv* env);
  44
  45  private:
  46   enum State {
  47     STATE_IDLE = 0,
  48     STATE_CAPTURING_AUDIO,
  49     STATE_AWAITING_FINAL_RESULT
  50   };
  51
  52   void StartRecognitionOnUIThread(
  53       std::string language, bool continuous, bool interim_results);
  54   void OnRecognitionResultsOnIOThread(SpeechRecognitionResults const &results);
  55
  56   ~SpeechRecognizerImplAndroid() override;
  57
  58   base::android::ScopedJavaGlobalRef<jobject> j_recognition_;
  59   State state_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(SpeechRecognizerImplAndroid);
  62 };
  63
  64 }  // namespace content
  65
  66 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_ANDROID_H_