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sdlaudio: add -audiodev sdl,out.buffer-count option

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Currently there is a crackling noise with SDL2 audio playback.
Commit bcf19777df: "audio/sdlaudio: Allow audio playback with
SDL2" already mentioned the crackling noise.

Add an out.buffer-count option to give users a chance to select
sane settings for glitch free audio playback. The idea was taken
from the coreaudio backend.

The in.buffer-count option will be used with one of the next
patches.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-3-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2021-01-10 11:02:19 +01:00 • committed by Gerd Hoffmann
parent ff69c481a2
commit 5a0926c23f
6 changed files with 52 additions and 7 deletions
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33
qapi/audio.json
View file

@ -301,6 +301,37 @@
'*out': 'AudiodevPaPerDirectionOptions',
'*server': 'str' } }
##
# @AudiodevSdlPerDirectionOptions:
#
# Options of the SDL audio backend that are used for both playback and
# recording.
#
# @buffer-count: number of buffers (default 4)
#
# Since: 6.0
##
{ 'struct': 'AudiodevSdlPerDirectionOptions',
'base': 'AudiodevPerDirectionOptions',
'data': {
'*buffer-count': 'uint32' } }
##
# @AudiodevSdlOptions:
#
# Options of the SDL audio backend.
#
# @in: options of the recording stream
#
# @out: options of the playback stream
#
# Since: 6.0
##
{ 'struct': 'AudiodevSdlOptions',
'data': {
'*in': 'AudiodevSdlPerDirectionOptions',
'*out': 'AudiodevSdlPerDirectionOptions' } }
##
# @AudiodevWavOptions:
#
@ -385,6 +416,6 @@
'jack': 'AudiodevJackOptions',
'oss': 'AudiodevOssOptions',
'pa': 'AudiodevPaOptions',
'sdl': 'AudiodevGenericOptions',
'sdl': 'AudiodevSdlOptions',
'spice': 'AudiodevGenericOptions',
'wav': 'AudiodevWavOptions' } }