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// Copyright (c) 2012 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 MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
#define MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
#include <string>
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/sync_socket.h"
#include "base/unguessable_token.h"
#include "media/base/audio_parameters.h"
#include "media/base/media_export.h"
#include "media/base/output_device_info.h"
namespace media {
// Contains IPC notifications for the state of the server side
// (AudioOutputController) audio state changes and when an AudioOutputController
// has been created. Implemented by AudioOutputDevice.
class MEDIA_EXPORT AudioOutputIPCDelegate {
public:
// Called when state of an audio stream has changed.
virtual void OnError() = 0;
// Called when an authorization request for an output device has been
// completed. The AudioOutputIPCDelegate will delete the AudioOutputIPC, if
// |device_status| is not OUTPUT_DEVICE_STATUS_OK.
virtual void OnDeviceAuthorized(OutputDeviceStatus device_status,
const media::AudioParameters& output_params,
const std::string& matched_device_id) = 0;
// Called when an audio stream has been created.
// See media/mojo/mojom/audio_data_pipe.mojom for documentation of
// |handle| and |socket_handle|. |playing_automatically| indicates if the
// AudioOutputIPCDelegate is playing right away due to an earlier call to
// Play();
virtual void OnStreamCreated(
base::UnsafeSharedMemoryRegion shared_memory_region,
base::SyncSocket::ScopedHandle socket_handle,
bool playing_automatically) = 0;
// Called when the AudioOutputIPC object is going away and/or when the IPC
// channel has been closed and no more ipc requests can be made.
// Implementations should delete their owned AudioOutputIPC instance
// immediately.
virtual void OnIPCClosed() = 0;
protected:
virtual ~AudioOutputIPCDelegate();
};
// Provides the IPC functionality for an AudioOutputIPCDelegate (e.g., an
// AudioOutputDevice). The implementation should asynchronously deliver the
// messages to an AudioOutputController object (or create one in the case of
// CreateStream()), that may live in a separate process.
class MEDIA_EXPORT AudioOutputIPC {
public:
virtual ~AudioOutputIPC();
// Sends a request to authorize the use of a specific audio output device
// in the peer process.
// If |device_id| is nonempty, the browser selects the device
// indicated by |device_id|, regardless of the value of |session_id|.
// If |device_id| is empty and |session_id| is nonzero, the browser selects
// the output device associated with an opened input device indicated by
// |session_id|. If no such device is found, the default device will be
// selected.
// If |device_id| is empty and |session_id| is zero, the browser selects
// the default device.
// Once the authorization process is complete, the implementation will
// notify |delegate| by calling OnDeviceAuthorized().
virtual void RequestDeviceAuthorization(
AudioOutputIPCDelegate* delegate,
const base::UnguessableToken& session_id,
const std::string& device_id) = 0;
// Sends a request to create an AudioOutputController object in the peer
// process and configures it to use the specified audio |params| including
// number of synchronized input channels.
// If no authorization for an output device has been previously requested,
// the default device will be used.
// Once the stream has been created, the implementation will notify
// |delegate| by calling OnStreamCreated().
virtual void CreateStream(
AudioOutputIPCDelegate* delegate,
const AudioParameters& params,
const absl::optional<base::UnguessableToken>& processing_id) = 0;
// Starts playing the stream. This should generate a call to
// AudioOutputController::Play().
virtual void PlayStream() = 0;
// Pauses an audio stream. This should generate a call to
// AudioOutputController::Pause().
virtual void PauseStream() = 0;
// Flushes an audio stream. This should only be called when the stream is
// paused.
virtual void FlushStream() = 0;
// Closes the audio stream which should shut down the corresponding
// AudioOutputController in the peer process. Usage of an AudioOutputIPC must
// always end with a call to CloseStream(), and the |delegate| passed to other
// method must remain valid until then. An exception is if OnIPCClosed is
// called first.
virtual void CloseStream() = 0;
// Sets the volume of the audio stream.
virtual void SetVolume(double volume) = 0;
};
} // namespace media
#endif // MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
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