text: // Copyright 2013 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_ANDROID_H_
  #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_ANDROID_H_
  
  #include <jni.h>
  
  #include "base/android/scoped_java_ref.h"
  #include "base/memory/ref_counted.h"
  #include "base/memory/scoped_ptr.h"
  #include "content/browser/speech/speech_recognizer.h"
  #include "content/public/common/speech_recognition_error.h"
  #include "content/public/common/speech_recognition_result.h"
  
  namespace content {
  
  class SpeechRecognitionEventListener;
  
  class CONTENT_EXPORT SpeechRecognizerImplAndroid : public SpeechRecognizer {
   public:
    SpeechRecognizerImplAndroid(SpeechRecognitionEventListener* listener,
                                int session_id);
  
    // SpeechRecognizer methods.
    virtual void StartRecognition(const std::string& device_id) override;
    virtual void AbortRecognition() override;
    virtual void StopAudioCapture() override;
    virtual bool IsActive() const override;
    virtual bool IsCapturingAudio() const override;
  
    // Called from Java methods via JNI.
    void OnAudioStart(JNIEnv* env, jobject obj);
    void OnSoundStart(JNIEnv* env, jobject obj);
    void OnSoundEnd(JNIEnv* env, jobject obj);
    void OnAudioEnd(JNIEnv* env, jobject obj);
    void OnRecognitionResults(JNIEnv* env, jobject obj, jobjectArray strings,
                              jfloatArray floats, jboolean interim);
    void OnRecognitionError(JNIEnv* env, jobject obj, jint error);
    void OnRecognitionEnd(JNIEnv* env, jobject obj);
  
    static bool RegisterSpeechRecognizer(JNIEnv* env);
  
   private:
    enum State {
      STATE_IDLE = 0,
      STATE_CAPTURING_AUDIO,
      STATE_AWAITING_FINAL_RESULT
    };
  
    void StartRecognitionOnUIThread(
        std::string language, bool continuous, bool interim_results);
    void OnRecognitionResultsOnIOThread(SpeechRecognitionResults const &results);
  
    virtual ~SpeechRecognizerImplAndroid();
  
    base::android::ScopedJavaGlobalRef<jobject> j_recognition_;
    State state_;
  
    DISALLOW_COPY_AND_ASSIGN(SpeechRecognizerImplAndroid);
  };
  
  }  // namespace content
  
  #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_ANDROID_H_
  