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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.
#include <string>
#include "base/memory/shared_memory.h"
#include "base/sync_socket.h"
#include "media/base/audio_parameters.h"
#include "media/base/media_export.h"
#include "media/base/output_device_info.h"
#include "url/origin.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 {
// 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
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.
// The shared memory |handle| points to a memory section that's used to
// transfer audio buffers from the AudioOutputIPCDelegate back to the
// AudioRendererHost. The implementation of OnStreamCreated takes ownership.
// The |socket_handle| is used by AudioRendererHost to signal requests for
// audio data to be written into the shared memory. The AudioOutputIPCDelegate
// must read from this socket and provide audio whenever data (search for
// "pending_bytes") is received.
virtual void OnStreamCreated(base::SharedMemoryHandle handle,
base::SyncSocket::Handle socket_handle,
int length) = 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;
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 {
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,
int session_id,
const std::string& device_id,
const url::Origin& security_origin) = 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) = 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;
// Closes the audio stream which should shut down the corresponding
// AudioOutputController in the peer process.
virtual void CloseStream() = 0;
// Sets the volume of the audio stream.
virtual void SetVolume(double volume) = 0;
} // namespace media