1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// Copyright (c) 2011 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.
#include "chrome/browser/extensions/extension_tts_api.h"
#include "base/memory/singleton.h"
#include "base/string_number_conversions.h"
#include "chrome/browser/chromeos/cros/cros_library.h"
#include "chrome/browser/chromeos/cros/speech_synthesis_library.h"
namespace util = extension_tts_api_util;
using base::DoubleToString;
namespace {
const char kCrosLibraryNotLoadedError[] = "Cros shared library not loaded.";
};
class ExtensionTtsPlatformImplChromeOs : public ExtensionTtsPlatformImpl {
public:
virtual bool Speak(
const std::string& utterance,
const std::string& locale,
const std::string& gender,
double rate,
double pitch,
double volume);
virtual bool StopSpeaking();
virtual bool IsSpeaking();
// Get the single instance of this class.
static ExtensionTtsPlatformImplChromeOs* GetInstance();
private:
ExtensionTtsPlatformImplChromeOs() {}
virtual ~ExtensionTtsPlatformImplChromeOs() {}
void AppendSpeakOption(std::string key,
std::string value,
std::string* options);
friend struct DefaultSingletonTraits<ExtensionTtsPlatformImplChromeOs>;
DISALLOW_COPY_AND_ASSIGN(ExtensionTtsPlatformImplChromeOs);
};
// static
ExtensionTtsPlatformImpl* ExtensionTtsPlatformImpl::GetInstance() {
return ExtensionTtsPlatformImplChromeOs::GetInstance();
}
bool ExtensionTtsPlatformImplChromeOs::Speak(
const std::string& utterance,
const std::string& locale,
const std::string& gender,
double rate,
double pitch,
double volume) {
chromeos::CrosLibrary* cros_library = chromeos::CrosLibrary::Get();
if (!cros_library->EnsureLoaded()) {
set_error(kCrosLibraryNotLoadedError);
return false;
}
std::string options;
if (!locale.empty()) {
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyLocale,
locale,
&options);
}
if (!gender.empty()) {
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyGender,
gender,
&options);
}
if (rate >= 0.0) {
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyRate,
DoubleToString(rate * 5),
&options);
}
if (pitch >= 0.0) {
// The TTS service allows a range of 0 to 2 for speech pitch.
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyPitch,
DoubleToString(pitch * 2),
&options);
}
if (volume >= 0.0) {
// The TTS service allows a range of 0 to 5 for speech volume.
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyVolume,
DoubleToString(volume * 5),
&options);
}
if (!options.empty()) {
cros_library->GetSpeechSynthesisLibrary()->SetSpeakProperties(
options.c_str());
}
return cros_library->GetSpeechSynthesisLibrary()->Speak(utterance.c_str());
}
bool ExtensionTtsPlatformImplChromeOs::StopSpeaking() {
if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
return chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
StopSpeaking();
}
set_error(kCrosLibraryNotLoadedError);
return false;
}
bool ExtensionTtsPlatformImplChromeOs::IsSpeaking() {
if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
return chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
IsSpeaking();
}
set_error(kCrosLibraryNotLoadedError);
return false;
}
void ExtensionTtsPlatformImplChromeOs::AppendSpeakOption(
std::string key,
std::string value,
std::string* options) {
*options +=
key +
chromeos::SpeechSynthesisLibrary::kSpeechPropertyEquals +
value +
chromeos::SpeechSynthesisLibrary::kSpeechPropertyDelimiter;
}
// static
ExtensionTtsPlatformImplChromeOs*
ExtensionTtsPlatformImplChromeOs::GetInstance() {
return Singleton<ExtensionTtsPlatformImplChromeOs>::get();
}
|
