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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/accessibility/service/speech_recognition_impl.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/ash/extensions/speech/speech_recognition_private_manager.h"
#include "chrome/browser/ash/extensions/speech/speech_recognition_private_recognizer.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/browser_context.h"
namespace ash {
namespace {
ax::mojom::SpeechRecognitionType ToMojo(speech::SpeechRecognitionType type) {
switch (type) {
case speech::SpeechRecognitionType::kNetwork:
return ax::mojom::SpeechRecognitionType::kNetwork;
case speech::SpeechRecognitionType::kOnDevice:
return ax::mojom::SpeechRecognitionType::kOnDevice;
}
}
} // namespace
//
// SpeechRecognitionEventObserverWrapper implementation.
//
SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper::
SpeechRecognitionEventObserverWrapper() = default;
SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper::
~SpeechRecognitionEventObserverWrapper() = default;
void SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper::OnStop() {
observer_->OnStop();
}
void SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper::OnResult(
ax::mojom::SpeechRecognitionResultEventPtr event) {
observer_->OnResult(std::move(event));
}
void SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper::OnError(
ax::mojom::SpeechRecognitionErrorEventPtr event) {
observer_->OnError(std::move(event));
}
mojo::PendingReceiver<ax::mojom::SpeechRecognitionEventObserver>
SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper::PassReceiver() {
return observer_.BindNewPipeAndPassReceiver();
}
//
// SpeechRecognitionImpl implementation.
//
SpeechRecognitionImpl::SpeechRecognitionImpl(content::BrowserContext* profile)
: profile_(profile) {
CHECK(profile_);
}
SpeechRecognitionImpl::~SpeechRecognitionImpl() = default;
void SpeechRecognitionImpl::Bind(
mojo::PendingReceiver<ax::mojom::SpeechRecognition> receiver) {
receivers_.Add(this, std::move(receiver));
}
void SpeechRecognitionImpl::Start(ax::mojom::StartOptionsPtr options,
StartCallback callback) {
// Extract arguments.
std::optional<std::string> locale;
std::optional<bool> interim_results;
if (options->locale) {
locale = *options->locale;
}
if (options->interim_results) {
interim_results = *options->interim_results;
}
std::string key = CreateKey(options->type);
GetSpeechRecognizer(key)->HandleStart(
locale, interim_results,
base::BindOnce(&SpeechRecognitionImpl::StartHelper, GetWeakPtr(),
std::move(callback), key));
}
void SpeechRecognitionImpl::Stop(ax::mojom::StopOptionsPtr options,
StopCallback callback) {
std::string key = CreateKey(options->type);
GetSpeechRecognizer(key)->HandleStop(
base::BindOnce(&SpeechRecognitionImpl::StopHelper, GetWeakPtr(),
std::move(callback), key));
}
void SpeechRecognitionImpl::HandleSpeechRecognitionStopped(
const std::string& key) {
auto* observer = GetEventObserverWrapper(key);
if (!observer) {
return;
}
observer->OnStop();
RemoveEventObserverWrapper(key);
}
void SpeechRecognitionImpl::HandleSpeechRecognitionResult(
const std::string& key,
const std::u16string& transcript,
bool is_final) {
auto* observer = GetEventObserverWrapper(key);
if (!observer) {
return;
}
auto result = ax::mojom::SpeechRecognitionResultEvent::New();
result->transcript = base::UTF16ToUTF8(transcript);
result->is_final = is_final;
observer->OnResult(std::move(result));
}
void SpeechRecognitionImpl::HandleSpeechRecognitionError(
const std::string& key,
const std::string& error) {
auto* observer = GetEventObserverWrapper(key);
if (!observer) {
return;
}
auto event = ax::mojom::SpeechRecognitionErrorEvent::New();
event->message = error;
observer->OnError(std::move(event));
RemoveEventObserverWrapper(key);
}
void SpeechRecognitionImpl::StartHelper(StartCallback callback,
const std::string& key,
speech::SpeechRecognitionType type,
std::optional<std::string> error) {
// Send relevant information back to the caller.
auto info = ax::mojom::SpeechRecognitionStartInfo::New();
info->type = ToMojo(type);
if (error.has_value()) {
info->observer_or_error =
ax::mojom::ObserverOrError::NewError(error.value());
std::move(callback).Run(std::move(info));
return;
}
CreateEventObserverWrapper(key);
auto* observer = GetEventObserverWrapper(key);
info->observer_or_error =
ax::mojom::ObserverOrError::NewObserver(observer->PassReceiver());
std::move(callback).Run(std::move(info));
}
void SpeechRecognitionImpl::StopHelper(StopCallback callback,
const std::string& key,
std::optional<std::string> error) {
RemoveEventObserverWrapper(key);
if (error.has_value()) {
std::move(callback).Run(std::move(error));
return;
}
std::move(callback).Run(std::optional<std::string>());
}
std::string SpeechRecognitionImpl::CreateKey(
ax::mojom::AssistiveTechnologyType type) {
// Dictation is the only accessibility feature that uses speech recognition.
// In the future, we can add support other accessibility features e.g.
// Voice Access.
DCHECK(type == ax::mojom::AssistiveTechnologyType::kDictation);
return "AtpSpeechRecognition.Dictation";
}
extensions::SpeechRecognitionPrivateRecognizer*
SpeechRecognitionImpl::GetSpeechRecognizer(const std::string& key) {
auto& recognizer = recognizers_[key];
if (!recognizer) {
recognizer =
std::make_unique<extensions::SpeechRecognitionPrivateRecognizer>(
this, profile_, key);
}
return recognizer.get();
}
void SpeechRecognitionImpl::CreateEventObserverWrapper(const std::string& key) {
auto& observer = event_observer_wrappers_[key];
if (!observer) {
observer = std::make_unique<SpeechRecognitionEventObserverWrapper>();
}
}
SpeechRecognitionImpl::SpeechRecognitionEventObserverWrapper*
SpeechRecognitionImpl::GetEventObserverWrapper(const std::string& key) {
auto& observer = event_observer_wrappers_[key];
if (!observer) {
return nullptr;
}
return observer.get();
}
void SpeechRecognitionImpl::RemoveEventObserverWrapper(const std::string& key) {
auto& observer = event_observer_wrappers_[key];
if (observer) {
observer.reset();
}
event_observer_wrappers_.erase(key);
}
} // namespace ash
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