Home | History | Annotate | Download | only in speech 
      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   virtual void StartRecognition(const std::string& device_id) OVERRIDE;
     28   virtual void AbortRecognition() OVERRIDE;
     29   virtual void StopAudioCapture() OVERRIDE;
     30   virtual bool IsActive() const OVERRIDE;
     31   virtual 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   virtual ~SpeechRecognizerImplAndroid();
     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_
     67