speech_recognition_manager_impl.h | Explore in Territory

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_MANAGER_IMPL_H_
#define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_MANAGER_IMPL_H_

#include <memory>
#include <optional>

#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/speech_recognition_event_listener.h"
#include "content/public/browser/speech_recognition_manager.h"
#include "content/public/browser/speech_recognition_session_config.h"
#include "content/public/browser/speech_recognition_session_context.h"
#include "media/mojo/mojom/speech_recognition.mojom.h"
#include "media/mojo/mojom/speech_recognition_error.mojom.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/mojom/mediastream/media_stream.mojom-forward.h"

namespace media {
class AudioSystem;
}

namespace content {
class BrowserMainLoop;
class MediaStreamManager;
class MediaStreamUIProxy;
class SpeechRecognitionManagerDelegate;
class SpeechRecognizer;

// This is the manager for speech recognition. It is a single instance in
// the browser process and can serve several requests. Each recognition request
// corresponds to a session, initiated via |CreateSession|.
//
// In any moment, the manager has a single session known as the primary session,
// |primary_session_id_|.
// This is the session that is capturing audio, waiting for user permission,
// etc. There may also be other, non-primary, sessions living in parallel that
// are waiting for results but not recording audio.
//
// The SpeechRecognitionManager has the following responsibilities:
//  - Handles requests received from various render frames and makes sure only
//    one of them accesses the audio device at any given time.
//  - Handles the instantiation of NetworkSpeechRecognitionEngineImpl objects
//    when requested by SpeechRecognitionSessions.
//  - Relays recognition results/status/error events of each session to the
//    corresponding listener (demuxing on the base of their session_id).
//  - Relays also recognition results/status/error events of every session to
//    the catch-all snoop listener (optionally) provided by the delegate.
class CONTENT_EXPORT SpeechRecognitionManagerImpl
    : public SpeechRecognitionManager,
      public SpeechRecognitionEventListener { … };

}  // namespace content

#endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_MANAGER_IMPL_H_
chromium/content/browser/speech/speech_recognition_manager_impl.h
