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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 #include "content/browser/speech/speech_recognizer.h" | 5 #include "content/browser/speech/speech_recognizer.h" |
6 | 6 |
7 #include "base/basictypes.h" | 7 #include "base/basictypes.h" |
8 #include "base/bind.h" | 8 #include "base/bind.h" |
9 #include "base/time.h" | 9 #include "base/time.h" |
10 #include "content/browser/browser_main_loop.h" | 10 #include "content/browser/browser_main_loop.h" |
11 #include "content/browser/speech/audio_buffer.h" | 11 #include "content/browser/speech/audio_buffer.h" |
12 #include "content/browser/speech/google_one_shot_remote_engine.h" | 12 #include "content/browser/speech/google_one_shot_remote_engine.h" |
13 #include "content/public/browser/browser_thread.h" | 13 #include "content/public/browser/browser_thread.h" |
14 #include "content/public/browser/speech_recognition_event_listener.h" | 14 #include "content/public/browser/speech_recognition_event_listener.h" |
15 #include "content/public/common/speech_recognition_error.h" | 15 #include "content/public/common/speech_recognition_error.h" |
16 #include "content/public/common/speech_recognition_grammar.h" | 16 #include "content/public/common/speech_recognition_grammar.h" |
17 #include "content/public/common/speech_recognition_result.h" | 17 #include "content/public/common/speech_recognition_result.h" |
18 #include "net/url_request/url_request_context_getter.h" | 18 #include "net/url_request/url_request_context_getter.h" |
19 | 19 |
20 using content::BrowserMainLoop; | 20 using content::BrowserMainLoop; |
21 using content::BrowserThread; | 21 using content::BrowserThread; |
22 using content::SpeechRecognitionError; | 22 using content::SpeechRecognitionError; |
23 using content::SpeechRecognitionEventListener; | 23 using content::SpeechRecognitionEventListener; |
24 using content::SpeechRecognitionGrammar; | 24 using content::SpeechRecognitionGrammar; |
25 using content::SpeechRecognitionResult; | 25 using content::SpeechRecognitionResult; |
26 using media::AudioInputController; | 26 using media::AudioInputController; |
27 using media::AudioManager; | 27 using media::AudioManager; |
28 using media::AudioParameters; | 28 using media::AudioParameters; |
| 29 using media::ChannelLayout; |
29 | 30 |
30 namespace { | 31 namespace { |
31 | 32 |
32 // The following constants are related to the volume level indicator shown in | 33 // The following constants are related to the volume level indicator shown in |
33 // the UI for recorded audio. | 34 // the UI for recorded audio. |
34 // Multiplier used when new volume is greater than previous level. | 35 // Multiplier used when new volume is greater than previous level. |
35 const float kUpSmoothingFactor = 1.0f; | 36 const float kUpSmoothingFactor = 1.0f; |
36 // Multiplier used when new volume is lesser than previous level. | 37 // Multiplier used when new volume is lesser than previous level. |
37 const float kDownSmoothingFactor = 0.7f; | 38 const float kDownSmoothingFactor = 0.7f; |
38 // RMS dB value of a maximum (unclipped) sine wave for int16 samples. | 39 // RMS dB value of a maximum (unclipped) sine wave for int16 samples. |
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62 } | 63 } |
63 | 64 |
64 void KeepAudioControllerRefcountedForDtor(scoped_refptr<AudioInputController>) { | 65 void KeepAudioControllerRefcountedForDtor(scoped_refptr<AudioInputController>) { |
65 } | 66 } |
66 | 67 |
67 } // namespace | 68 } // namespace |
68 | 69 |
69 namespace speech { | 70 namespace speech { |
70 | 71 |
71 const int SpeechRecognizer::kAudioSampleRate = 16000; | 72 const int SpeechRecognizer::kAudioSampleRate = 16000; |
72 const ChannelLayout SpeechRecognizer::kChannelLayout = CHANNEL_LAYOUT_MONO; | 73 const ChannelLayout SpeechRecognizer::kChannelLayout = |
| 74 media::CHANNEL_LAYOUT_MONO; |
73 const int SpeechRecognizer::kNumBitsPerAudioSample = 16; | 75 const int SpeechRecognizer::kNumBitsPerAudioSample = 16; |
74 const int SpeechRecognizer::kNoSpeechTimeoutMs = 8000; | 76 const int SpeechRecognizer::kNoSpeechTimeoutMs = 8000; |
75 const int SpeechRecognizer::kEndpointerEstimationTimeMs = 300; | 77 const int SpeechRecognizer::kEndpointerEstimationTimeMs = 300; |
76 media::AudioManager* SpeechRecognizer::audio_manager_for_tests_ = NULL; | 78 media::AudioManager* SpeechRecognizer::audio_manager_for_tests_ = NULL; |
77 | 79 |
78 COMPILE_ASSERT(SpeechRecognizer::kNumBitsPerAudioSample % 8 == 0, | 80 COMPILE_ASSERT(SpeechRecognizer::kNumBitsPerAudioSample % 8 == 0, |
79 kNumBitsPerAudioSample_must_be_a_multiple_of_8); | 81 kNumBitsPerAudioSample_must_be_a_multiple_of_8); |
80 | 82 |
81 SpeechRecognizer::SpeechRecognizer( | 83 SpeechRecognizer::SpeechRecognizer( |
82 SpeechRecognitionEventListener* listener, | 84 SpeechRecognitionEventListener* listener, |
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658 : event(event_value), | 660 : event(event_value), |
659 audio_error_code(0), | 661 audio_error_code(0), |
660 audio_data(NULL), | 662 audio_data(NULL), |
661 engine_error(content::SPEECH_RECOGNITION_ERROR_NONE) { | 663 engine_error(content::SPEECH_RECOGNITION_ERROR_NONE) { |
662 } | 664 } |
663 | 665 |
664 SpeechRecognizer::FSMEventArgs::~FSMEventArgs() { | 666 SpeechRecognizer::FSMEventArgs::~FSMEventArgs() { |
665 } | 667 } |
666 | 668 |
667 } // namespace speech | 669 } // namespace speech |
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