mirror of
https://github.com/qemu/qemu.git
synced 2024-11-28 22:33:36 +08:00
f614277765
The latency of a connection to the PulseAudio server is determined by the tlength parameter. This was hardcoded to 10ms, which is a bit too tight on my machine, causing audio on host and guest to malfunction. A setting of 15ms works fine here. To allow tweaking, I also made the setting configurable via the new -audiodev config. This allows to squeeze out better timings in scenarios where the emulation allows it. I also removed setting of the minreq parameter to (seemingly arbitrary) half the latency, since it showed worse audio quality during my tests. Allowing PulseAudio to request smaller chunks helped. Signed-off-by: Martin Schrodt <martin@schrodt.org> Message-id: 20190315084653.120020-3-martin@schrodt.org Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
309 lines
7.2 KiB
Python
309 lines
7.2 KiB
Python
# -*- 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.
|
|
#
|
|
# @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': {
|
|
'*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
|
|
#
|
|
# @latency: latency you want PulseAudio to achieve in microseconds
|
|
# (default 15000)
|
|
#
|
|
# Since: 4.0
|
|
##
|
|
{ 'struct': 'AudiodevPaPerDirectionOptions',
|
|
'base': 'AudiodevPerDirectionOptions',
|
|
'data': {
|
|
'*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' } }
|