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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 <stdint.h>
#include "base/memory/read_only_shared_memory_region.h"
#include "base/sync_socket.h"
#include "media/base/audio_parameters.h"
#include "media/base/media_export.h"
namespace media {
class AudioProcessorControls;
// Contains IPC notifications for the state of the server side
// (AudioInputController) audio state changes and when an AudioInputController
// has been created. Implemented by AudioInputDevice.
class MEDIA_EXPORT AudioInputIPCDelegate {
// Called when an AudioInputController has been created.
// See media/mojo/interfaces/audio_data_pipe.mojom for documentation of
// |handle| and |socket_handle|.
virtual void OnStreamCreated(
base::ReadOnlySharedMemoryRegion shared_memory_region,
base::SyncSocket::Handle socket_handle,
bool initially_muted) = 0;
// Called when state of an audio stream has changed.
virtual void OnError() = 0;
// Called when an audio stream is muted or unmuted.
virtual void OnMuted(bool is_muted) = 0;
// Called when the AudioInputIPC 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 AudioInputIPC instance
// immediately.
virtual void OnIPCClosed() = 0;
virtual ~AudioInputIPCDelegate();
// Provides IPC functionality for an AudioInputIPCDelegate (e.g., an
// AudioInputDevice). The implementation should asynchronously deliver the
// messages to an AudioInputController object (or create one in the case of
// CreateStream()), that may live in a separate process.
class MEDIA_EXPORT AudioInputIPC {
virtual ~AudioInputIPC();
// Sends a request to create an AudioInputController object in the peer
// process, and configures it to use the specified audio |params|. The
// |total_segments| indidates number of equal-lengthed segments in the shared
// memory buffer. Once the stream has been created, the implementation will
// notify |delegate| by calling OnStreamCreated().
virtual void CreateStream(AudioInputIPCDelegate* delegate,
const AudioParameters& params,
bool automatic_gain_control,
uint32_t total_segments) = 0;
// Corresponds to a call to AudioInputController::Record() on the server side.
virtual void RecordStream() = 0;
// Sets the volume of the audio stream.
virtual void SetVolume(double volume) = 0;
// Sets the output device from which to cancel echo, if supported. The
// |output_device_id| can be gotten from a device enumeration. Must not be
// called before the stream has been successfully created.
virtual void SetOutputDeviceForAec(const std::string& output_device_id) = 0;
// If the input has built-in processing, returns a pointer to processing
// controls. Valid after the stream has been created.
virtual AudioProcessorControls* GetProcessorControls();
// Closes the audio stream, which should shut down the corresponding
// AudioInputController in the peer process.
virtual void CloseStream() = 0;
} // namespace media