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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_INPUT_IPC_H_
- #define MEDIA_AUDIO_AUDIO_INPUT_IPC_H_
- #include <stdint.h>
- #include "base/memory/read_only_shared_memory_region.h"
- #include "base/sync_socket.h"
- #include "media/base/audio_capturer_source.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 {
- public:
- // Called when an AudioInputController has been created.
- // See media/mojo/mojom/audio_data_pipe.mojom for documentation of
- // |handle| and |socket_handle|.
- virtual void OnStreamCreated(
- base::ReadOnlySharedMemoryRegion shared_memory_region,
- base::SyncSocket::ScopedHandle socket_handle,
- bool initially_muted) = 0;
- // Called when state of an audio stream has changed.
- virtual void OnError(AudioCapturerSource::ErrorCode code) = 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;
- protected:
- 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 {
- public:
- 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
- #endif // MEDIA_AUDIO_AUDIO_INPUT_IPC_H_
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