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// Copyright 2021 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/extensions/speech/speech_recognition_private_recognizer.h"
#include "ash/public/cpp/projector/speech_recognition_availability.h"
#include "base/debug/crash_logging.h"
#include "chrome/browser/ash/extensions/speech/speech_recognition_private_manager.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/speech/network_speech_recognizer.h"
#include "chrome/browser/speech/speech_recognition_recognizer_client_impl.h"
#include "components/language/core/browser/pref_names.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/storage_partition.h"
#include "media/audio/audio_device_description.h"
#include "media/mojo/mojom/speech_recognition_service.mojom.h"
namespace {
const char kSpeechRecognitionError[] = "A speech recognition error occurred";
const char kSpeechRecognitionNeverStartedError[] =
"Speech recognition never started";
const char kSpeechRecognitionStartError[] =
"Speech recognition already started";
const char kSpeechRecognitionStopError[] = "Speech recognition already stopped";
} // namespace
namespace extensions {
SpeechRecognitionPrivateRecognizer::SpeechRecognitionPrivateRecognizer(
SpeechRecognitionPrivateDelegate* delegate,
content::BrowserContext* context,
const std::string& id)
: delegate_(delegate), context_(context), id_(id) {
DCHECK(delegate);
}
SpeechRecognitionPrivateRecognizer::~SpeechRecognitionPrivateRecognizer() =
default;
void SpeechRecognitionPrivateRecognizer::OnSpeechResult(
const std::u16string& text,
bool is_final,
const std::optional<media::SpeechRecognitionResult>& full_result) {
// TODO(crbug.com/40186322): NetworkSpeechRecognizer adds spaces between
// results, but SpeechRecognitionRecognizerClientImpl doesn't. Add behavior in
// SpeechRecognitionRecognizerClientImpl so it's consistent with
// NetworkSpeechRecognizer.
if (!interim_results_ && !is_final) {
// If |interim_results_| is false, then don't handle the result unless this
// is a final result.
return;
}
delegate_->HandleSpeechRecognitionResult(id_, text, is_final);
}
void SpeechRecognitionPrivateRecognizer::OnSpeechRecognitionStateChanged(
SpeechRecognizerStatus new_state) {
// Crash keys for https://crbug.com/1296304.
SCOPED_CRASH_KEY_NUMBER("Accessibility", "Speech recognition state",
new_state);
SpeechRecognizerStatus next_state = new_state;
if (new_state == SPEECH_RECOGNIZER_READY) {
if (current_state_ == SPEECH_RECOGNIZER_OFF && speech_recognizer_) {
// The SpeechRecognizer is ready to start recognizing speech.
speech_recognizer_->Start();
} else {
// Turn the recognizer off and use |delegate_| to notify listeners of the
// API that speech recognition has stopped.
next_state = SPEECH_RECOGNIZER_OFF;
RecognizerOff();
delegate_->HandleSpeechRecognitionStopped(id_);
}
} else if (new_state == SPEECH_RECOGNIZER_RECOGNIZING) {
if (!on_start_callback_.is_null()) {
std::move(on_start_callback_)
.Run(/*type=*/type_, /*error=*/std::optional<std::string>());
} else {
// If we get here, we are unintentionally recognizing speech. Turn off
// the recognizer.
next_state = SPEECH_RECOGNIZER_OFF;
RecognizerOff();
}
} else if (new_state == SPEECH_RECOGNIZER_ERROR) {
// When a speech recognition error occurs, ask the delegate to handle both
// error and stop events.
next_state = SPEECH_RECOGNIZER_OFF;
RecognizerOff();
delegate_->HandleSpeechRecognitionError(id_, kSpeechRecognitionError);
delegate_->HandleSpeechRecognitionStopped(id_);
}
current_state_ = next_state;
}
void SpeechRecognitionPrivateRecognizer::HandleStart(
std::optional<std::string> locale,
std::optional<bool> interim_results,
OnStartCallback callback) {
if (speech_recognizer_) {
std::move(callback).Run(
/*type=*/type_,
/*error=*/std::optional<std::string>(kSpeechRecognitionStartError));
RecognizerOff();
return;
}
MaybeUpdateProperties(locale, interim_results, std::move(callback));
// Choose which type of speech recognition, either on-device or network.
Profile* profile = Profile::FromBrowserContext(context_);
if (SpeechRecognitionRecognizerClientImpl::
GetOnDeviceSpeechRecognitionAvailability(locale_) ==
ash::OnDeviceRecognitionAvailability::kAvailable) {
type_ = speech::SpeechRecognitionType::kOnDevice;
speech_recognizer_ =
std::make_unique<SpeechRecognitionRecognizerClientImpl>(
GetWeakPtr(), profile,
media::AudioDeviceDescription::kDefaultDeviceId,
media::mojom::SpeechRecognitionOptions::New(
media::mojom::SpeechRecognitionMode::kIme,
/*enable_formatting=*/false,
/*language=*/locale_,
/*is_server_based=*/false,
media::mojom::RecognizerClientType::kDictation));
} else {
type_ = speech::SpeechRecognitionType::kNetwork;
speech_recognizer_ = std::make_unique<NetworkSpeechRecognizer>(
GetWeakPtr(),
profile->GetDefaultStoragePartition()
->GetURLLoaderFactoryForBrowserProcessIOThread(),
locale_);
}
}
void SpeechRecognitionPrivateRecognizer::HandleStop(OnStopCallback callback) {
bool has_error = false;
if (!on_start_callback_.is_null()) {
// If speech recognition never successfully started, then run the necessary
// callbacks with an error to avoid dangling callbacks (Chrome
// will crash if an extension function is destroyed and hasn't responded).
has_error = true;
std::move(on_start_callback_)
.Run(/*type=*/type_, /*error=*/std::optional<std::string>(
kSpeechRecognitionNeverStartedError));
std::move(callback).Run(
/*error=*/std::optional<std::string>(kSpeechRecognitionStopError));
} else if (current_state_ == SPEECH_RECOGNIZER_OFF) {
// If speech recognition is already off, run `callback` with an error
// message.
has_error = true;
std::move(callback).Run(
/*error=*/std::optional<std::string>(kSpeechRecognitionStopError));
}
RecognizerOff();
if (has_error)
return;
delegate_->HandleSpeechRecognitionStopped(id_);
DCHECK(!callback.is_null());
std::move(callback).Run(/*error=*/std::optional<std::string>());
}
void SpeechRecognitionPrivateRecognizer::RecognizerOff() {
current_state_ = SPEECH_RECOGNIZER_OFF;
if (speech_recognizer_)
speech_recognizer_.reset();
}
void SpeechRecognitionPrivateRecognizer::MaybeUpdateProperties(
std::optional<std::string> locale,
std::optional<bool> interim_results,
OnStartCallback callback) {
if (locale.has_value())
locale_ = locale.value();
if (interim_results.has_value())
interim_results_ = interim_results.value();
on_start_callback_ = std::move(callback);
DCHECK(!on_start_callback_.is_null());
}
} // namespace extensions
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