[PATCH 6/7] audio: reintroduce default audio backend for VNC

[Paolo Bonzini <pbonzini@redhat.com>]

Make VNC use the default backend again if one is defined.
The recently introduced support for disabling the VNC audio
extension is still used, in case no default backend exists.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 audio/audio.c                   | 28 ++++++++++++++++++----------
 audio/audio.h                   |  1 +
 docs/about/removed-features.rst | 10 ++--------
 ui/vnc.c                        |  2 ++
 4 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/audio/audio.c b/audio/audio.c
index de37ad7c074..ca0df29555a 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1801,20 +1801,28 @@ out:
     return NULL;
 }
 
+AudioState *audio_get_default_audio_state(Error **errp)
+{
+    if (!default_audio_state) {
+        default_audio_state = audio_init(NULL, errp);
+        if (!default_audio_state) {
+            if (!QSIMPLEQ_EMPTY(&audiodevs)) {
+                error_append_hint(errp, "Perhaps you wanted to set audiodev=%s?\n",
+                                  QSIMPLEQ_FIRST(&audiodevs)->dev->id);
+            }
+        }
+    }
+
+    return default_audio_state;
+}
+
 bool AUD_register_card (const char *name, QEMUSoundCard *card, Error **errp)
 {
     if (!card->state) {
-        if (!default_audio_state) {
-            default_audio_state = audio_init(NULL, errp);
-            if (!default_audio_state) {
-                if (!QSIMPLEQ_EMPTY(&audiodevs)) {
-                    error_append_hint(errp, "Perhaps you wanted to set audiodev=%s?\n",
-                                      QSIMPLEQ_FIRST(&audiodevs)->dev->id);
-                }
-                return false;
-            }
+        card->state = audio_get_default_audio_state(errp);
+        if (!card->state) {
+            return false;
         }
-        card->state = default_audio_state;
     }
 
     card->name = g_strdup (name);
diff --git a/audio/audio.h b/audio/audio.h
index 6da5e8f6f0f..fcc22307bee 100644
--- a/audio/audio.h
+++ b/audio/audio.h
@@ -176,6 +176,7 @@ void audio_init_audiodevs(void);
 void audio_help(void);
 
 AudioState *audio_state_by_name(const char *name, Error **errp);
+AudioState *audio_get_default_audio_state(Error **errp);
 const char *audio_get_id(QEMUSoundCard *card);
 
 #define DEFINE_AUDIO_PROPERTIES(_s, _f)         \
diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst
index 27639370f96..a5e5a1ba1a5 100644
--- a/docs/about/removed-features.rst
+++ b/docs/about/removed-features.rst
@@ -449,17 +449,11 @@ QEMU does not create default audio backends anymore if any of the
 ``-audiodev``, ``-audio`` or ``-nodefaults`` options are used on the
 command line.
 
-If an audio backend is created with ``-audiodev``, each sound card
-that wants to use it should specify an ``audiodev=``
+If an audio backend is created with ``-audiodev``, each audio client
+(a sound card or VNC) that wants to use it should specify an ``audiodev=``
 property.  Previously, the first audiodev command line option would be
 used as a fallback.
 
-Creating vnc without ``audiodev=`` property (removed in 8.2)
-''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
-
-When using vnc, you should specify an ``audiodev=`` property if
-you plan to transmit audio through the VNC protocol.
-
 QEMU Machine Protocol (QMP) commands
 ------------------------------------
 
diff --git a/ui/vnc.c b/ui/vnc.c
index acbb88c4ca0..7f4c471503a 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -4185,6 +4185,8 @@ void vnc_display_open(const char *id, Error **errp)
         if (!vd->audio_state) {
             goto fail;
         }
+    } else {
+        vd->audio_state = audio_get_default_audio_state(NULL);
     }
 
     device_id = qemu_opt_get(opts, "display");
-- 
2.41.0