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// Copyright 2018 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.
#ifndef SERVICES_AUDIO_OUTPUT_STREAM_H_
#define SERVICES_AUDIO_OUTPUT_STREAM_H_
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/strings/string_piece.h"
#include "base/sync_socket.h"
#include "base/timer/timer.h"
#include "media/mojo/interfaces/audio_data_pipe.mojom.h"
#include "media/mojo/interfaces/audio_logging.mojom.h"
#include "media/mojo/interfaces/audio_output_stream.mojom.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "mojo/public/cpp/system/buffer.h"
#include "mojo/public/cpp/system/handle.h"
#include "mojo/public/cpp/system/platform_handle.h"
#include "services/audio/loopback_coordinator.h"
#include "services/audio/output_controller.h"
#include "services/audio/stream_monitor_coordinator.h"
#include "services/audio/sync_reader.h"
namespace base {
class UnguessableToken;
} // namespace base
namespace media {
class AudioManager;
class AudioParameters;
} // namespace media
namespace audio {
class OutputStream final : public media::mojom::AudioOutputStream,
public OutputController::EventHandler {
public:
using DeleteCallback = base::OnceCallback<void(OutputStream*)>;
using CreatedCallback =
base::OnceCallback<void(media::mojom::ReadWriteAudioDataPipePtr)>;
OutputStream(CreatedCallback created_callback,
DeleteCallback delete_callback,
media::mojom::AudioOutputStreamRequest stream_request,
media::mojom::AudioOutputStreamObserverAssociatedPtr observer,
media::mojom::AudioLogPtr log,
media::AudioManager* audio_manager,
const std::string& output_device_id,
const media::AudioParameters& params,
LoopbackCoordinator* coordinator,
const base::UnguessableToken& loopback_group_id,
StreamMonitorCoordinator* stream_monitor_coordinator,
const base::UnguessableToken& processing_id);
~OutputStream() final;
// media::mojom::AudioOutputStream implementation.
void Play() final;
void Pause() final;
void SetVolume(double volume) final;
// OutputController::EventHandler implementation.
void OnControllerPlaying() final;
void OnControllerPaused() final;
void OnControllerError() final;
void OnLog(base::StringPiece message) final;
private:
void CreateAudioPipe(CreatedCallback created_callback);
void OnError();
void CallDeleter();
void PollAudioLevel();
bool IsAudible();
SEQUENCE_CHECKER(owning_sequence_);
base::CancelableSyncSocket foreign_socket_;
DeleteCallback delete_callback_;
mojo::Binding<AudioOutputStream> binding_;
media::mojom::AudioOutputStreamObserverAssociatedPtr observer_;
const scoped_refptr<media::mojom::ThreadSafeAudioLogPtr> log_;
LoopbackCoordinator* const coordinator_;
SyncReader reader_;
OutputController controller_;
// A token indicating membership in a group of output controllers/streams.
const base::UnguessableToken loopback_group_id_;
// This flag ensures that we only send OnStreamStateChanged notifications
// and (de)register with the stream monitor when the state actually changes.
bool playing_ = false;
// Calls PollAudioLevel() at regular intervals while |playing_| is true.
base::RepeatingTimer poll_timer_;
bool is_audible_ = false;
base::WeakPtrFactory<OutputStream> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(OutputStream);
};
} // namespace audio
#endif // SERVICES_AUDIO_OUTPUT_STREAM_H_