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qapi, audio: add query-audiodev command 

Way back in QEMU 4.0, the -audiodev command line option was introduced
for configuring audio backends. This CLI option does not use QemuOpts
so it is not visible for introspection in 'query-command-line-options',
instead using the QAPI Audiodev type.  Unfortunately there is also no
QMP command that uses the Audiodev type, so it is not introspectable
with 'query-qmp-schema' either.

This introduces a 'query-audiodev' command that simply reflects back
the list of configured -audiodev command line options. This alone is
maybe not very useful by itself, but it makes Audiodev introspectable
via 'query-qmp-schema', so that libvirt (and other upper layer tools)
can discover the available audiodevs.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
[thuth: Update for upcoming QEMU v8.0, and use QAPI_LIST_PREPEND]
Message-Id: <20230123083957.20349-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2023-01-23 09:39:56 +01:00 committed by Thomas Huth
parent e59a59a457
commit 637d18090e
2 changed files with 25 additions and 0 deletions
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12
audio/audio.c
View File

@ -28,8 +28,10 @@
#include "monitor/monitor.h"
#include "qemu/timer.h"
#include "qapi/error.h"
#include "qapi/clone-visitor.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/qapi-visit-audio.h"
#include "qapi/qapi-commands-audio.h"
#include "qemu/cutils.h"
#include "qemu/module.h"
#include "qemu/help_option.h"
@ -2311,3 +2313,13 @@ size_t audio_rate_get_bytes(RateCtl *rate, struct audio_pcm_info *info,
return bytes;
}
AudiodevList *qmp_query_audiodevs(Error **errp)
{
AudiodevList *ret = NULL;
AudiodevListEntry *e;
QSIMPLEQ_FOREACH(e, &audiodevs, next) {
QAPI_LIST_PREPEND(ret, QAPI_CLONE(Audiodev, e->dev));
}
return ret;
}

13
qapi/audio.json
View File

@ -443,3 +443,16 @@
'sndio': 'AudiodevSndioOptions',
'spice': 'AudiodevGenericOptions',
'wav': 'AudiodevWavOptions' } }
##
# @query-audiodevs:
#
# Returns information about audiodev configuration
#
# Returns: array of @Audiodev
#
# Since: 8.0
#
##
{ 'command': 'query-audiodevs',
'returns': ['Audiodev'] }