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// Copyright 2017 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 CONTENT_RENDERER_MEDIA_AUDIO_MOJO_AUDIO_OUTPUT_IPC_H_
#define CONTENT_RENDERER_MEDIA_AUDIO_MOJO_AUDIO_OUTPUT_IPC_H_
#include <string>
#include "base/callback_helpers.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/optional.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/common/media/renderer_audio_output_stream_factory.mojom.h"
#include "media/audio/audio_output_ipc.h"
#include "media/mojo/mojom/audio_data_pipe.mojom.h"
#include "media/mojo/mojom/audio_output_stream.mojom.h"
#include "mojo/public/cpp/bindings/binding.h"
namespace content {
// 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 CONTENT_EXPORT MojoAudioOutputIPC
: public media::AudioOutputIPC,
public media::mojom::AudioOutputStreamProviderClient {
public:
using FactoryAccessorCB =
base::RepeatingCallback<mojom::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() 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,
const base::Optional<base::UnguessableToken>& processing_id) override;
void PlayStream() override;
void PauseStream() override;
void FlushStream() override;
void CloseStream() override;
void SetVolume(double volume) override;
// media::mojom::AudioOutputStreamProviderClient implementation.
void Created(media::mojom::AudioOutputStreamPtr stream,
media::mojom::ReadWriteAudioDataPipePtr data_pipe) override;
private:
static constexpr double kDefaultVolume = 1.0;
using AuthorizationCB = mojom::RendererAudioOutputStreamFactory::
RequestDeviceAuthorizationCallback;
bool AuthorizationRequested() const;
bool StreamCreationRequested() const;
void ProviderClientBindingDisconnected(uint32_t disconnect_reason,
const std::string& description);
media::mojom::AudioOutputStreamProviderRequest MakeProviderRequest();
// Tries to acquire a RendererAudioOutputStreamFactory and requests device
// authorization. On failure to aquire 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::OutputDeviceStatus status,
const media::AudioParameters& params,
const std::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;
base::Optional<double> volume_;
mojo::Binding<media::mojom::AudioOutputStreamProviderClient> binding_;
media::mojom::AudioOutputStreamProviderPtr stream_provider_;
media::mojom::AudioOutputStreamPtr stream_;
media::AudioOutputIPCDelegate* delegate_ = nullptr;
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
base::TimeTicks stream_creation_start_time_;
// 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};
DISALLOW_COPY_AND_ASSIGN(MojoAudioOutputIPC);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_AUDIO_MOJO_AUDIO_OUTPUT_IPC_H_
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