Refactoring of chrome speech recognition architecture (CL1.3)

content/browser/speech/google_one_shot_remote_engine.h

Index: content/browser/speech/google_one_shot_remote_engine.h
diff --git a/content/browser/speech/google_one_shot_remote_engine.h b/content/browser/speech/google_one_shot_remote_engine.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff833cca0fb9c955b00d8b662a085714bc2c4137
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+++ b/content/browser/speech/google_one_shot_remote_engine.h
@@ -0,0 +1,84 @@
+// Copyright (c) 2012 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_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_
+#define CONTENT_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/speech/audio_encoder.h"
+#include "content/browser/speech/speech_recognition_engine.h"
+#include "content/common/content_export.h"
+#include "content/public/common/url_fetcher_delegate.h"
+#include "googleurl/src/gurl.h"
+
+class URLFetcher;
+
+namespace content {
+struct SpeechRecognitionResult;
+}
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace speech {
+
+class AudioChunk;
+
+struct GoogleOneShotRemoteEngineConfig {
+  std::string language;
+  std::string grammar;
+  bool filter_profanities;
+  std::string hardware_info;
+  std::string origin_url;
+  int audio_sample_rate;
+  int audio_num_bits_per_sample;
+
+  GoogleOneShotRemoteEngineConfig();
+  ~GoogleOneShotRemoteEngineConfig();
+};
+
+// Implements a SpeechRecognitionEngine by means of remote interaction with
+// Google speech recognition webservice.
+class GoogleOneShotRemoteEngine
+    : public SpeechRecognitionEngine,
+      public content::URLFetcherDelegate {
+ public:
+  // Duration of each audio packet.
+  static const int kAudioPacketIntervalMs;
+  // ID passed to URLFetcher::Create(). Used for testing.
+  static int url_fetcher_id_for_tests;
+
+  explicit GoogleOneShotRemoteEngine(net::URLRequestContextGetter* context);
+  virtual ~GoogleOneShotRemoteEngine();
+  void SetConfig(const GoogleOneShotRemoteEngineConfig& config);
+
+  // SpeechRecognitionEngine methods.
+  virtual void StartRecognition() OVERRIDE;
+  virtual void EndRecognition() OVERRIDE;
+  virtual void TakeAudioChunk(const AudioChunk& data) OVERRIDE;
+  virtual void AudioChunksEnded() OVERRIDE;
+  virtual bool IsRecognitionPending() const OVERRIDE;
+  virtual int GetDesiredAudioChunkDurationMs() const OVERRIDE;
+
+  // content::URLFetcherDelegate methods.
+  virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
+
+ private:
+  GoogleOneShotRemoteEngineConfig config_;
+  scoped_ptr<content::URLFetcher> url_fetcher_;
+  scoped_refptr<net::URLRequestContextGetter> url_context_;
+  scoped_ptr<AudioEncoder> encoder_;
+
+  DISALLOW_COPY_AND_ASSIGN(GoogleOneShotRemoteEngine);
+};
+
+}  // namespace speech
+
+#endif  // CONTENT_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_