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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/speech/speech_synthesis_impl.h"
#include "content/browser/media/audio_stream_monitor.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/browser/speech/tts_utterance_impl.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/web_contents.h"
namespace content {
namespace {
using AudibleCB = base::RepeatingCallback<
std::unique_ptr<AudioStreamMonitor::AudibleClientRegistration>()>;
// The lifetime of instances of this class is manually bound to the lifetime of
// the associated TtsUtterance. See OnTtsEvent.
class EventThunk : public UtteranceEventDelegate {
public:
EventThunk(mojo::PendingRemote<blink::mojom::SpeechSynthesisClient> client,
AudibleCB audible_cb)
: client_(std::move(client)), audible_cb_(std::move(audible_cb)) {}
~EventThunk() override = default;
// UtteranceEventDelegate methods:
void OnTtsEvent(TtsUtterance* utterance,
TtsEventType event_type,
int char_index,
int char_length,
const std::string& error_message) override {
// These values are unsigned in the web speech API, so -1 cannot be used as
// a sentinel value. Use 0 instead to match web standards.
char_index = std::max(char_index, 0);
char_length = std::max(char_length, 0);
switch (event_type) {
case TTS_EVENT_START:
audible_client_ = audible_cb_.Run();
client_->OnStartedSpeaking();
break;
case TTS_EVENT_END:
audible_client_.reset();
client_->OnFinishedSpeaking(
blink::mojom::SpeechSynthesisErrorCode::kNoError);
break;
case TTS_EVENT_INTERRUPTED:
audible_client_.reset();
client_->OnFinishedSpeaking(
blink::mojom::SpeechSynthesisErrorCode::kInterrupted);
break;
case TTS_EVENT_CANCELLED:
audible_client_.reset();
client_->OnFinishedSpeaking(
blink::mojom::SpeechSynthesisErrorCode::kCancelled);
break;
case TTS_EVENT_WORD:
client_->OnEncounteredWordBoundary(char_index, char_length);
break;
case TTS_EVENT_SENTENCE:
client_->OnEncounteredSentenceBoundary(char_index, 0);
break;
case TTS_EVENT_MARKER:
// The web platform API does not support this event.
break;
case TTS_EVENT_ERROR:
audible_client_.reset();
// The web platform API does not support error text.
client_->OnEncounteredSpeakingError();
break;
case TTS_EVENT_PAUSE:
audible_client_.reset();
client_->OnPausedSpeaking();
break;
case TTS_EVENT_RESUME:
audible_client_ = audible_cb_.Run();
client_->OnResumedSpeaking();
break;
}
if (utterance->IsFinished())
delete this;
}
private:
mojo::Remote<blink::mojom::SpeechSynthesisClient> client_;
AudibleCB audible_cb_;
std::unique_ptr<AudioStreamMonitor::AudibleClientRegistration>
audible_client_;
};
void SendVoiceListToObserver(
blink::mojom::SpeechSynthesisVoiceListObserver* observer,
const std::vector<VoiceData>& voices) {
std::vector<blink::mojom::SpeechSynthesisVoicePtr> out_voices;
out_voices.resize(voices.size());
for (size_t i = 0; i < voices.size(); ++i) {
blink::mojom::SpeechSynthesisVoicePtr& out_voice = out_voices[i];
out_voice = blink::mojom::SpeechSynthesisVoice::New();
out_voice->voice_uri = voices[i].name;
out_voice->name = voices[i].name;
out_voice->lang = voices[i].lang;
out_voice->is_local_service = !voices[i].remote;
out_voice->is_default = (i == 0);
}
observer->OnSetVoiceList(std::move(out_voices));
}
} // namespace
SpeechSynthesisImpl::SpeechSynthesisImpl(BrowserContext* browser_context,
RenderFrameHostImpl* rfh)
: browser_context_(browser_context),
web_contents_(WebContents::FromRenderFrameHost((rfh))),
frame_id_(rfh->GetGlobalId()) {
DCHECK(browser_context_);
DCHECK(web_contents_);
TtsController::GetInstance()->AddVoicesChangedDelegate(this);
}
SpeechSynthesisImpl::~SpeechSynthesisImpl() {
TtsController::GetInstance()->RemoveVoicesChangedDelegate(this);
// NOTE: Some EventThunk instances may outlive this class, and that's okay.
// They have their lifetime bound to their associated TtsUtterance instance,
// and the TtsController manages the lifetime of those.
}
void SpeechSynthesisImpl::AddReceiver(
mojo::PendingReceiver<blink::mojom::SpeechSynthesis> receiver) {
receiver_set_.Add(this, std::move(receiver));
}
void SpeechSynthesisImpl::AddVoiceListObserver(
mojo::PendingRemote<blink::mojom::SpeechSynthesisVoiceListObserver>
pending_observer) {
mojo::Remote<blink::mojom::SpeechSynthesisVoiceListObserver> observer(
std::move(pending_observer));
std::vector<VoiceData> voices;
TtsController::GetInstance()->GetVoices(browser_context_, GURL(), &voices);
SendVoiceListToObserver(observer.get(), voices);
observer_set_.Add(std::move(observer));
}
void SpeechSynthesisImpl::Speak(
blink::mojom::SpeechSynthesisUtterancePtr utterance,
mojo::PendingRemote<blink::mojom::SpeechSynthesisClient> client) {
if (web_contents_->IsAudioMuted())
return;
std::unique_ptr<TtsUtterance> tts_utterance =
std::make_unique<TtsUtteranceImpl>(browser_context_, web_contents_);
tts_utterance->SetText(utterance->text);
tts_utterance->SetLang(utterance->lang);
tts_utterance->SetVoiceName(utterance->voice);
tts_utterance->SetShouldClearQueue(false);
tts_utterance->SetContinuousParameters(utterance->rate, utterance->pitch,
utterance->volume);
// See comments on EventThunk about how lifetime of this instance is managed.
tts_utterance->SetEventDelegate(new EventThunk(
std::move(client),
base::BindRepeating(
&AudioStreamMonitor::RegisterAudibleClient,
base::Unretained(static_cast<WebContentsImpl*>(web_contents_)
->audio_stream_monitor()),
frame_id_)));
TtsController::GetInstance()->SpeakOrEnqueue(std::move(tts_utterance));
}
void SpeechSynthesisImpl::Pause() {
TtsController::GetInstance()->Pause();
}
void SpeechSynthesisImpl::Resume() {
TtsController::GetInstance()->Resume();
}
void SpeechSynthesisImpl::Cancel() {
TtsController::GetInstance()->Stop();
}
void SpeechSynthesisImpl::OnVoicesChanged() {
std::vector<VoiceData> voices;
TtsController::GetInstance()->GetVoices(browser_context_, GURL(), &voices);
for (auto& observer : observer_set_)
SendVoiceListToObserver(observer.get(), voices);
}
} // namespace content
|
