path: root/qapi/audio.json

# -*- mode: python -*-
#
# Copyright (C) 2015-2019 Zoltán Kővágó <DirtY.iCE.hu@gmail.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.

##
# @AudiodevPerDirectionOptions:
#
# General audio backend options that are used for both playback and
# recording.
#
# @mixing-engine: use QEMU's mixing engine to mix all streams inside QEMU and
#                 convert audio formats when not supported by the backend. When
#                 set to off, fixed-settings must be also off (default on,
#                 since 4.2)
#
# @fixed-settings: use fixed settings for host input/output. When off,
#                  frequency, channels and format must not be
#                  specified (default true)
#
# @frequency: frequency to use when using fixed settings
#             (default 44100)
#
# @channels: number of channels when using fixed settings (default 2)
#
# @voices: number of voices to use (default 1)
#
# @format: sample format to use when using fixed settings
#          (default s16)
#
# @buffer-length: the buffer length in microseconds
#
# Since: 4.0
##
{ 'struct': 'AudiodevPerDirectionOptions',
  'data': {
    '*mixing-engine':  'bool',
    '*fixed-settings': 'bool',
    '*frequency':      'uint32',
    '*channels':       'uint32',
    '*voices':         'uint32',
    '*format':         'AudioFormat',
    '*buffer-length':  'uint32' } }

##
# @AudiodevGenericOptions:
#
# Generic driver-specific options.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# Since: 4.0
##
{ 'struct': 'AudiodevGenericOptions',
  'data': {
    '*in':  'AudiodevPerDirectionOptions',
    '*out': 'AudiodevPerDirectionOptions' } }

##
# @AudiodevAlsaPerDirectionOptions:
#
# Options of the ALSA backend that are used for both playback and
# recording.
#
# @dev: the name of the ALSA device to use (default 'default')
#
# @period-length: the period length in microseconds
#
# @try-poll: attempt to use poll mode, falling back to non-polling
#            access on failure (default true)
#
# Since: 4.0
##
{ 'struct': 'AudiodevAlsaPerDirectionOptions',
  'base': 'AudiodevPerDirectionOptions',
  'data': {
    '*dev':           'str',
    '*period-length': 'uint32',
    '*try-poll':      'bool' } }

##
# @AudiodevAlsaOptions:
#
# Options of the ALSA audio backend.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# @threshold: set the threshold (in microseconds) when playback starts
#
# Since: 4.0
##
{ 'struct': 'AudiodevAlsaOptions',
  'data': {
    '*in':        'AudiodevAlsaPerDirectionOptions',
    '*out':       'AudiodevAlsaPerDirectionOptions',
    '*threshold': 'uint32' } }

##
# @AudiodevCoreaudioPerDirectionOptions:
#
# Options of the Core Audio backend that are used for both playback and
# recording.
#
# @buffer-count: number of buffers
#
# Since: 4.0
##
{ 'struct': 'AudiodevCoreaudioPerDirectionOptions',
  'base': 'AudiodevPerDirectionOptions',
  'data': {
    '*buffer-count': 'uint32' } }

##
# @AudiodevCoreaudioOptions:
#
# Options of the coreaudio audio backend.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# Since: 4.0
##
{ 'struct': 'AudiodevCoreaudioOptions',
  'data': {
    '*in':  'AudiodevCoreaudioPerDirectionOptions',
    '*out': 'AudiodevCoreaudioPerDirectionOptions' } }

##
# @AudiodevDsoundOptions:
#
# Options of the DirectSound audio backend.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# @latency: add extra latency to playback in microseconds
#           (default 10000)
#
# Since: 4.0
##
{ 'struct': 'AudiodevDsoundOptions',
  'data': {
    '*in':      'AudiodevPerDirectionOptions',
    '*out':     'AudiodevPerDirectionOptions',
    '*latency': 'uint32' } }

##
# @AudiodevOssPerDirectionOptions:
#
# Options of the OSS backend that are used for both playback and
# recording.
#
# @dev: file name of the OSS device (default '/dev/dsp')
#
# @buffer-count: number of buffers
#
# @try-poll: attempt to use poll mode, falling back to non-polling
#            access on failure (default true)
#
# Since: 4.0
##
{ 'struct': 'AudiodevOssPerDirectionOptions',
  'base': 'AudiodevPerDirectionOptions',
  'data': {
    '*dev':          'str',
    '*buffer-count': 'uint32',
    '*try-poll':     'bool' } }

##
# @AudiodevOssOptions:
#
# Options of the OSS audio backend.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# @try-mmap: try using memory-mapped access, falling back to
#            non-memory-mapped access on failure (default true)
#
# @exclusive: open device in exclusive mode (vmix won't work)
#             (default false)
#
# @dsp-policy: set the timing policy of the device (between 0 and 10,
#              where smaller number means smaller latency but higher
#              CPU usage) or -1 to use fragment mode (option ignored
#              on some platforms) (default 5)
#
# Since: 4.0
##
{ 'struct': 'AudiodevOssOptions',
  'data': {
    '*in':         'AudiodevOssPerDirectionOptions',
    '*out':        'AudiodevOssPerDirectionOptions',
    '*try-mmap':   'bool',
    '*exclusive':  'bool',
    '*dsp-policy': 'uint32' } }

##
# @AudiodevPaPerDirectionOptions:
#
# Options of the Pulseaudio backend that are used for both playback and
# recording.
#
# @name: name of the sink/source to use
#
# @stream-name: name of the PulseAudio stream created by qemu.  Can be
#               used to identify the stream in PulseAudio when you
#               create multiple PulseAudio devices or run multiple qemu
#               instances (default: audiodev's id, since 4.2)
#
# @latency: latency you want PulseAudio to achieve in microseconds
#           (default 15000)
#
# Since: 4.0
##
{ 'struct': 'AudiodevPaPerDirectionOptions',
  'base': 'AudiodevPerDirectionOptions',
  'data': {
    '*name': 'str',
    '*stream-name': 'str',
    '*latency': 'uint32' } }

##
# @AudiodevPaOptions:
#
# Options of the PulseAudio audio backend.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# @server: PulseAudio server address (default: let PulseAudio choose)
#
# Since: 4.0
##
{ 'struct': 'AudiodevPaOptions',
  'data': {
    '*in':     'AudiodevPaPerDirectionOptions',
    '*out':    'AudiodevPaPerDirectionOptions',
    '*server': 'str' } }

##
# @AudiodevWavOptions:
#
# Options of the wav audio backend.
#
# @in: options of the capture stream
#
# @out: options of the playback stream
#
# @path: name of the wav file to record (default 'qemu.wav')
#
# Since: 4.0
##
{ 'struct': 'AudiodevWavOptions',
  'data': {
    '*in':   'AudiodevPerDirectionOptions',
    '*out':  'AudiodevPerDirectionOptions',
    '*path': 'str' } }


##
# @AudioFormat:
#
# An enumeration of possible audio formats.
#
# Since: 4.0
##
{ 'enum': 'AudioFormat',
  'data': [ 'u8', 's8', 'u16', 's16', 'u32', 's32' ] }

##
# @AudiodevDriver:
#
# An enumeration of possible audio backend drivers.
#
# Since: 4.0
##
{ 'enum': 'AudiodevDriver',
  'data': [ 'none', 'alsa', 'coreaudio', 'dsound', 'oss', 'pa', 'sdl',
            'spice', 'wav' ] }

##
# @Audiodev:
#
# Options of an audio backend.
#
# @id: identifier of the backend
#
# @driver: the backend driver to use
#
# @timer-period: timer period (in microseconds, 0: use lowest possible)
#
# Since: 4.0
##
{ 'union': 'Audiodev',
  'base': {
    'id':            'str',
    'driver':        'AudiodevDriver',
    '*timer-period': 'uint32' },
  'discriminator': 'driver',
  'data': {
    'none':      'AudiodevGenericOptions',
    'alsa':      'AudiodevAlsaOptions',
    'coreaudio': 'AudiodevCoreaudioOptions',
    'dsound':    'AudiodevDsoundOptions',
    'oss':       'AudiodevOssOptions',
    'pa':        'AudiodevPaOptions',
    'sdl':       'AudiodevGenericOptions',
    'spice':     'AudiodevGenericOptions',
    'wav':       'AudiodevWavOptions' } }