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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIA_AUDIO_MOJO_AUDIO_OUTPUT_IPC_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIA_AUDIO_MOJO_AUDIO_OUTPUT_IPC_H_
#include <string>
#include "base/functional/callback_helpers.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "base/time/time.h"
#include "media/audio/audio_output_ipc.h"
#include "media/mojo/mojom/audio_data_pipe.mojom-blink.h"
#include "media/mojo/mojom/audio_output_stream.mojom-blink.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/mojom/media/renderer_audio_output_stream_factory.mojom-blink.h"
#include "third_party/blink/renderer/modules/modules_export.h"
namespace blink {
// MojoAudioOutputIPC is a renderer-side class for handling creation,
// initialization and control of an output stream. May only be used on a single
// thread.
class MODULES_EXPORT MojoAudioOutputIPC
: public media::AudioOutputIPC,
public media::mojom::blink::AudioOutputStreamProviderClient {
public:
using FactoryAccessorCB = base::RepeatingCallback<
blink::mojom::blink::RendererAudioOutputStreamFactory*()>;
// |factory_accessor| is required to provide a
// RendererAudioOutputStreamFactory* if IPC is possible.
MojoAudioOutputIPC(
FactoryAccessorCB factory_accessor,
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner);
MojoAudioOutputIPC(const MojoAudioOutputIPC&) = delete;
MojoAudioOutputIPC& operator=(const MojoAudioOutputIPC&) = delete;
~MojoAudioOutputIPC() override;
// AudioOutputIPC implementation.
void RequestDeviceAuthorization(media::AudioOutputIPCDelegate* delegate,
const base::UnguessableToken& session_id,
const std::string& device_id) override;
void CreateStream(media::AudioOutputIPCDelegate* delegate,
const media::AudioParameters& params) override;
void PlayStream() override;
void PauseStream() override;
void FlushStream() override;
void CloseStream() override;
void SetVolume(double volume) override;
// media::mojom::AudioOutputStreamProviderClient implementation.
void Created(
mojo::PendingRemote<media::mojom::blink::AudioOutputStream> stream,
media::mojom::blink::ReadWriteAudioDataPipePtr data_pipe) override;
private:
static constexpr double kDefaultVolume = 1.0;
using AuthorizationCB = blink::mojom::blink::
RendererAudioOutputStreamFactory::RequestDeviceAuthorizationCallback;
bool AuthorizationRequested() const;
bool StreamCreationRequested() const;
void ProviderClientBindingDisconnected(uint32_t disconnect_reason,
const std::string& description);
mojo::PendingReceiver<media::mojom::blink::AudioOutputStreamProvider>
MakeProviderReceiver();
// Tries to acquire a RendererAudioOutputStreamFactory and requests device
// authorization. On failure to acquire a factory, |callback| is destructed
// asynchronously.
void DoRequestDeviceAuthorization(const base::UnguessableToken& session_id,
const std::string& device_id,
AuthorizationCB callback);
void ReceivedDeviceAuthorization(
base::TimeTicks auth_start_time,
media::mojom::blink::OutputDeviceStatus status,
const media::AudioParameters& params,
const String& device_id) const;
const FactoryAccessorCB factory_accessor_;
// This is the state that |delegate_| expects the stream to be in. It is
// maintained for when the stream is created.
enum { kPaused, kPlaying } expected_state_ = kPaused;
std::optional<double> volume_;
mojo::Receiver<media::mojom::blink::AudioOutputStreamProviderClient>
receiver_{this};
mojo::Remote<media::mojom::blink::AudioOutputStreamProvider> stream_provider_;
mojo::Remote<media::mojom::blink::AudioOutputStream> stream_;
raw_ptr<media::AudioOutputIPCDelegate> delegate_ = nullptr;
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
// To make sure we don't send an "authorization completed" callback for a
// stream after it's closed, we use this weak factory.
base::WeakPtrFactory<MojoAudioOutputIPC> weak_factory_{this};
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIA_AUDIO_MOJO_AUDIO_OUTPUT_IPC_H_
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