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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_ENGINE_H_ | 5 #ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_ENGINE_H_ |
6 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_ENGINE_H_ | 6 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_ENGINE_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
11 #include "content/common/content_export.h" | 11 #include "content/common/content_export.h" |
12 #include "content/public/common/speech_recognition_grammar.h" | 12 #include "content/public/common/speech_recognition_grammar.h" |
| 13 #include "content/public/common/speech_recognition_result.h" |
13 | 14 |
14 namespace content { | 15 namespace content { |
15 | 16 |
16 class AudioChunk; | 17 class AudioChunk; |
17 struct SpeechRecognitionResult; | |
18 struct SpeechRecognitionError; | 18 struct SpeechRecognitionError; |
19 | 19 |
20 // This interface models the basic contract that a speech recognition engine, | 20 // This interface models the basic contract that a speech recognition engine, |
21 // either working locally or relying on a remote web-service, must obey. | 21 // either working locally or relying on a remote web-service, must obey. |
22 // The expected call sequence for exported methods is: | 22 // The expected call sequence for exported methods is: |
23 // StartRecognition Mandatory at beginning of SR. | 23 // StartRecognition Mandatory at beginning of SR. |
24 // TakeAudioChunk For every audio chunk pushed. | 24 // TakeAudioChunk For every audio chunk pushed. |
25 // AudioChunksEnded Finalize the audio stream (omitted in case of errors). | 25 // AudioChunksEnded Finalize the audio stream (omitted in case of errors). |
26 // EndRecognition Mandatory at end of SR (even on errors). | 26 // EndRecognition Mandatory at end of SR (even on errors). |
27 // No delegate callbacks are allowed before StartRecognition or after | 27 // No delegate callbacks are allowed before StartRecognition or after |
28 // EndRecognition. If a recognition was started, the caller can free the | 28 // EndRecognition. If a recognition was started, the caller can free the |
29 // SpeechRecognitionEngine only after calling EndRecognition. | 29 // SpeechRecognitionEngine only after calling EndRecognition. |
30 class SpeechRecognitionEngine { | 30 class SpeechRecognitionEngine { |
31 public: | 31 public: |
32 // Interface for receiving callbacks from this object. | 32 // Interface for receiving callbacks from this object. |
33 class Delegate { | 33 class Delegate { |
34 public: | 34 public: |
35 // Called whenever a result is retrieved. It might be issued several times, | 35 // Called whenever a result is retrieved. It might be issued several times, |
36 // (e.g., in the case of continuous speech recognition engine | 36 // (e.g., in the case of continuous speech recognition engine |
37 // implementations). | 37 // implementations). |
38 virtual void OnSpeechRecognitionEngineResult( | 38 virtual void OnSpeechRecognitionEngineResults( |
39 const SpeechRecognitionResult& result) = 0; | 39 const SpeechRecognitionResults& results) = 0; |
40 virtual void OnSpeechRecognitionEngineError( | 40 virtual void OnSpeechRecognitionEngineError( |
41 const SpeechRecognitionError& error) = 0; | 41 const SpeechRecognitionError& error) = 0; |
42 | 42 |
43 protected: | 43 protected: |
44 virtual ~Delegate() {} | 44 virtual ~Delegate() {} |
45 }; | 45 }; |
46 | 46 |
47 // Remote engine configuration. | 47 // Remote engine configuration. |
48 struct CONTENT_EXPORT Config { | 48 struct CONTENT_EXPORT Config { |
49 Config(); | 49 Config(); |
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103 | 103 |
104 // These typedefs are to workaround the issue with certain versions of | 104 // These typedefs are to workaround the issue with certain versions of |
105 // Visual Studio where it gets confused between multiple Delegate | 105 // Visual Studio where it gets confused between multiple Delegate |
106 // classes and gives a C2500 error. | 106 // classes and gives a C2500 error. |
107 typedef SpeechRecognitionEngine::Delegate SpeechRecognitionEngineDelegate; | 107 typedef SpeechRecognitionEngine::Delegate SpeechRecognitionEngineDelegate; |
108 typedef SpeechRecognitionEngine::Config SpeechRecognitionEngineConfig; | 108 typedef SpeechRecognitionEngine::Config SpeechRecognitionEngineConfig; |
109 | 109 |
110 } // namespace content | 110 } // namespace content |
111 | 111 |
112 #endif // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_ENGINE_H_ | 112 #endif // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_ENGINE_H_ |
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