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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_GOOGLE_STREAMING_REMOTE_ENGINE_H_ | 5 #ifndef CONTENT_BROWSER_SPEECH_GOOGLE_STREAMING_REMOTE_ENGINE_H_ |
| 6 #define CONTENT_BROWSER_SPEECH_GOOGLE_STREAMING_REMOTE_ENGINE_H_ | 6 #define CONTENT_BROWSER_SPEECH_GOOGLE_STREAMING_REMOTE_ENGINE_H_ |
| 7 | 7 |
| 8 #include <string> | 8 #include <string> |
| 9 #include <vector> | 9 #include <vector> |
| 10 | 10 |
| 11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
| 12 #include "base/memory/ref_counted.h" | 12 #include "base/memory/ref_counted.h" |
| 13 #include "base/memory/scoped_ptr.h" | 13 #include "base/memory/scoped_ptr.h" |
| 14 #include "base/threading/non_thread_safe.h" | 14 #include "base/threading/non_thread_safe.h" |
| 15 #include "content/browser/speech/audio_encoder.h" | 15 #include "content/browser/speech/audio_encoder.h" |
| 16 #include "content/browser/speech/chunked_byte_buffer.h" | 16 #include "content/browser/speech/chunked_byte_buffer.h" |
| 17 #include "content/browser/speech/speech_recognition_engine.h" | 17 #include "content/browser/speech/speech_recognition_engine.h" |
| 18 #include "content/common/content_export.h" | 18 #include "content/common/content_export.h" |
| 19 #include "content/public/common/speech_recognition_error.h" | 19 #include "content/public/common/speech_recognition_error.h" |
| 20 #include "googleurl/src/gurl.h" | 20 #include "googleurl/src/gurl.h" |
| 21 #include "net/url_request/url_fetcher_delegate.h" | 21 #include "net/url_request/url_fetcher_delegate.h" |
| 22 | 22 |
| 23 namespace content { | |
| 24 struct SpeechRecognitionError; | |
| 25 struct SpeechRecognitionResult; | |
| 26 } | |
| 27 | |
| 28 namespace net { | 23 namespace net { |
| 29 class URLRequestContextGetter; | 24 class URLRequestContextGetter; |
| 30 } | 25 } |
| 31 | 26 |
| 32 namespace speech { | 27 namespace content { |
| 33 | 28 |
| 34 class AudioChunk; | 29 class AudioChunk; |
| 30 struct SpeechRecognitionError; |
| 31 struct SpeechRecognitionResult; |
| 35 | 32 |
| 36 // Implements a SpeechRecognitionEngine supporting continuous recognition by | 33 // Implements a SpeechRecognitionEngine supporting continuous recognition by |
| 37 // means of interaction with Google streaming speech recognition webservice. | 34 // means of interaction with Google streaming speech recognition webservice. |
| 38 // More in details, this class establishes two HTTP(S) connections with the | 35 // More in details, this class establishes two HTTP(S) connections with the |
| 39 // webservice, for each session, herein called "upstream" and "downstream". | 36 // webservice, for each session, herein called "upstream" and "downstream". |
| 40 // Audio chunks are sent on the upstream by means of a chunked HTTP POST upload. | 37 // Audio chunks are sent on the upstream by means of a chunked HTTP POST upload. |
| 41 // Recognition results are retrieved in a full-duplex fashion (i.e. while | 38 // Recognition results are retrieved in a full-duplex fashion (i.e. while |
| 42 // pushing audio on the upstream) on the downstream by means of a chunked | 39 // pushing audio on the upstream) on the downstream by means of a chunked |
| 43 // HTTP GET request. Pairing between the two stream is handled through a | 40 // HTTP GET request. Pairing between the two stream is handled through a |
| 44 // randomly generated key, unique for each request, which is passed in the | 41 // randomly generated key, unique for each request, which is passed in the |
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| 131 | 128 |
| 132 // The methods below handle transitions of the recognizer FSM. | 129 // The methods below handle transitions of the recognizer FSM. |
| 133 FSMState ConnectBothStreams(const FSMEventArgs& event_args); | 130 FSMState ConnectBothStreams(const FSMEventArgs& event_args); |
| 134 FSMState TransmitAudioUpstream(const FSMEventArgs& event_args); | 131 FSMState TransmitAudioUpstream(const FSMEventArgs& event_args); |
| 135 FSMState ProcessDownstreamResponse(const FSMEventArgs& event_args); | 132 FSMState ProcessDownstreamResponse(const FSMEventArgs& event_args); |
| 136 FSMState RaiseNoMatchErrorIfGotNoResults(const FSMEventArgs& event_args); | 133 FSMState RaiseNoMatchErrorIfGotNoResults(const FSMEventArgs& event_args); |
| 137 FSMState CloseUpstreamAndWaitForResults(const FSMEventArgs& event_args); | 134 FSMState CloseUpstreamAndWaitForResults(const FSMEventArgs& event_args); |
| 138 FSMState CloseDownstream(const FSMEventArgs& event_args); | 135 FSMState CloseDownstream(const FSMEventArgs& event_args); |
| 139 FSMState AbortSilently(const FSMEventArgs& event_args); | 136 FSMState AbortSilently(const FSMEventArgs& event_args); |
| 140 FSMState AbortWithError(const FSMEventArgs& event_args); | 137 FSMState AbortWithError(const FSMEventArgs& event_args); |
| 141 FSMState Abort(content::SpeechRecognitionErrorCode error); | 138 FSMState Abort(SpeechRecognitionErrorCode error); |
| 142 FSMState DoNothing(const FSMEventArgs& event_args); | 139 FSMState DoNothing(const FSMEventArgs& event_args); |
| 143 FSMState NotFeasible(const FSMEventArgs& event_args); | 140 FSMState NotFeasible(const FSMEventArgs& event_args); |
| 144 | 141 |
| 145 std::string GetAcceptedLanguages() const; | 142 std::string GetAcceptedLanguages() const; |
| 146 std::string GenerateRequestKey() const; | 143 std::string GenerateRequestKey() const; |
| 147 | 144 |
| 148 SpeechRecognitionEngineConfig config_; | 145 SpeechRecognitionEngineConfig config_; |
| 149 scoped_ptr<net::URLFetcher> upstream_fetcher_; | 146 scoped_ptr<net::URLFetcher> upstream_fetcher_; |
| 150 scoped_ptr<net::URLFetcher> downstream_fetcher_; | 147 scoped_ptr<net::URLFetcher> downstream_fetcher_; |
| 151 scoped_refptr<net::URLRequestContextGetter> url_context_; | 148 scoped_refptr<net::URLRequestContextGetter> url_context_; |
| 152 scoped_ptr<AudioEncoder> encoder_; | 149 scoped_ptr<AudioEncoder> encoder_; |
| 153 ChunkedByteBuffer chunked_byte_buffer_; | 150 ChunkedByteBuffer chunked_byte_buffer_; |
| 154 size_t previous_response_length_; | 151 size_t previous_response_length_; |
| 155 bool got_last_definitive_result_; | 152 bool got_last_definitive_result_; |
| 156 bool is_dispatching_event_; | 153 bool is_dispatching_event_; |
| 157 FSMState state_; | 154 FSMState state_; |
| 158 | 155 |
| 159 DISALLOW_COPY_AND_ASSIGN(GoogleStreamingRemoteEngine); | 156 DISALLOW_COPY_AND_ASSIGN(GoogleStreamingRemoteEngine); |
| 160 }; | 157 }; |
| 161 | 158 |
| 162 } // namespace speech | 159 } // namespace content |
| 163 | 160 |
| 164 #endif // CONTENT_BROWSER_SPEECH_GOOGLE_STREAMING_REMOTE_ENGINE_H_ | 161 #endif // CONTENT_BROWSER_SPEECH_GOOGLE_STREAMING_REMOTE_ENGINE_H_ |
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