components/arc/common/audio.mojom

// Copyright 2016 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.

// Next MinVersion: 5

module arc.mojom;

// Use same switch values as kernel switch events.
[Extensible]
enum AudioSwitch {
  SW_HEADPHONE_INSERT = 0x02,
  SW_MICROPHONE_INSERT = 0x04
};

// Next method ID:2
interface AudioHost {
  // Tells the host to show the volume controls.
  ShowVolumeControls@0();

  // Request that the volume be changed to |volume|.
  // This is a privileged API and should only be used on whitelisted cases.
  // |percent| is of the range [0, 100].
  [MinVersion=3] OnSystemVolumeUpdateRequest@1(int32 percent);
};

// Next method ID: 4
interface AudioInstance {
  // DEPRECATED: Please use Init@3 instead.
  [MinVersion=1] InitDeprecated@1(AudioHost host);

  // Establishes full-duplex communication with the host.
  [MinVersion=4] Init@3(AudioHost host) => ();

  // Notify plug states of headphone, microphone, etc.  Each switch state is
  // represented by the corresponding bit, if the bit is set then the switch
  // is plugged/inserted.
  NotifySwitchState@0(uint32 state);

  // Notify volume and mute state.
  // volume ranges from 0 to 100.
  // muted == true if audio is muted.
  [MinVersion=2] NotifyVolumeState@2(uint32 volume, bool muted);
};