Implement SpeechRecognizerImplAndroid

content/browser/speech/speech_recognizer_impl_android.h

+// Copyright (c) 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() 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(bool continuous, bool interim_results);
+  void OnRecognitionResultsOnIOThread(std::vector<string16> options,
+                                      std::vector<float> scores,

[bulach, 2013/06/11 07:24:48]

vectors should be passed by const& rather than by value (to avoid an extra copy)

[janx, 2013/06/12 14:47:14]

Moved creation of SpeechRecognitionResults object to UI thread, now passed as a
single "std::vector<X> const &x".

+                                      bool provisional);
+
+  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_