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| 1 // Copyright (c) 2012 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_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_ |
| 6 #define CONTENT_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_ |
| 7 #pragma once |
| 8 |
| 9 #include <string> |
| 10 |
| 11 #include "base/basictypes.h" |
| 12 #include "base/memory/ref_counted.h" |
| 13 #include "base/memory/scoped_ptr.h" |
| 14 #include "content/browser/speech/audio_encoder.h" |
| 15 #include "content/browser/speech/speech_recognition_engine.h" |
| 16 #include "content/common/content_export.h" |
| 17 #include "content/public/common/url_fetcher_delegate.h" |
| 18 #include "googleurl/src/gurl.h" |
| 19 |
| 20 class URLFetcher; |
| 21 |
| 22 namespace content { |
| 23 struct SpeechRecognitionResult; |
| 24 } |
| 25 |
| 26 namespace net { |
| 27 class URLRequestContextGetter; |
| 28 } |
| 29 |
| 30 namespace speech { |
| 31 |
| 32 class AudioChunk; |
| 33 |
| 34 struct GoogleOneShotRemoteEngineConfig { |
| 35 std::string language; |
| 36 std::string grammar; |
| 37 bool filter_profanities; |
| 38 std::string hardware_info; |
| 39 std::string origin_url; |
| 40 int audio_sample_rate; |
| 41 int audio_num_bits_per_sample; |
| 42 |
| 43 GoogleOneShotRemoteEngineConfig(); |
| 44 ~GoogleOneShotRemoteEngineConfig(); |
| 45 }; |
| 46 |
| 47 // Implements a SpeechRecognitionEngine by means of remote interaction with |
| 48 // Google speech recognition webservice. |
| 49 class GoogleOneShotRemoteEngine |
| 50 : public SpeechRecognitionEngine, |
| 51 public content::URLFetcherDelegate { |
| 52 public: |
| 53 // Duration of each audio packet. |
| 54 static const int kAudioPacketIntervalMs; |
| 55 // ID passed to URLFetcher::Create(). Used for testing. |
| 56 static int url_fetcher_id_for_tests; |
| 57 |
| 58 explicit GoogleOneShotRemoteEngine(net::URLRequestContextGetter* context); |
| 59 virtual ~GoogleOneShotRemoteEngine(); |
| 60 void SetConfig(const GoogleOneShotRemoteEngineConfig& config); |
| 61 |
| 62 // SpeechRecognitionEngine methods. |
| 63 virtual void StartRecognition() OVERRIDE; |
| 64 virtual void EndRecognition() OVERRIDE; |
| 65 virtual void TakeAudioChunk(const AudioChunk& data) OVERRIDE; |
| 66 virtual void AudioChunksEnded() OVERRIDE; |
| 67 virtual bool IsRecognitionPending() const OVERRIDE; |
| 68 virtual int GetDesiredAudioChunkDurationMs() const OVERRIDE; |
| 69 |
| 70 // content::URLFetcherDelegate methods. |
| 71 virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE; |
| 72 |
| 73 private: |
| 74 GoogleOneShotRemoteEngineConfig config_; |
| 75 scoped_ptr<content::URLFetcher> url_fetcher_; |
| 76 scoped_refptr<net::URLRequestContextGetter> url_context_; |
| 77 scoped_ptr<AudioEncoder> encoder_; |
| 78 |
| 79 DISALLOW_COPY_AND_ASSIGN(GoogleOneShotRemoteEngine); |
| 80 }; |
| 81 |
| 82 } // namespace speech |
| 83 |
| 84 #endif // CONTENT_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_ |
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