audio/spice: add support for volume control

Use Spice server volume control API when available.
Signed-off-by: NMarc-Andr? Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Nmalc <av1474@comtv.ru>

audio/spiceaudio.c

@@ -202,7 +202,26 @@ static int line_out_ctl (HWVoiceOut *hw, int cmd, ...)
         }
         spice_server_playback_stop (&out->sin);
         break;
+    case VOICE_VOLUME:
+        {
+#if ((SPICE_INTERFACE_PLAYBACK_MAJOR >= 1) && (SPICE_INTERFACE_PLAYBACK_MINOR >= 2))
+            SWVoiceOut *sw;
+            va_list ap;
+            uint16_t vol[2];
+
+            va_start (ap, cmd);
+            sw = va_arg (ap, SWVoiceOut *);
+            va_end (ap);
+
+            vol[0] = sw->vol.l / ((1ULL << 16) + 1);
+            vol[1] = sw->vol.r / ((1ULL << 16) + 1);
+            spice_server_playback_set_volume (&out->sin, 2, vol);
+            spice_server_playback_set_mute (&out->sin, sw->vol.mute);
+#endif
+            break;
+        }
     }
+
     return 0;
 }
 
@@ -304,7 +323,26 @@ static int line_in_ctl (HWVoiceIn *hw, int cmd, ...)
         in->active = 0;
         spice_server_record_stop (&in->sin);
         break;
+    case VOICE_VOLUME:
+        {
+#if ((SPICE_INTERFACE_RECORD_MAJOR >= 2) && (SPICE_INTERFACE_RECORD_MINOR >= 2))
+            SWVoiceIn *sw;
+            va_list ap;
+            uint16_t vol[2];
+
+            va_start (ap, cmd);
+            sw = va_arg (ap, SWVoiceIn *);
+            va_end (ap);
+
+            vol[0] = sw->vol.l / ((1ULL << 16) + 1);
+            vol[1] = sw->vol.r / ((1ULL << 16) + 1);
+            spice_server_record_set_volume (&in->sin, 2, vol);
+            spice_server_record_set_mute (&in->sin, sw->vol.mute);
+#endif
+            break;
+        }
     }
+
     return 0;
 }
 
@@ -337,6 +375,9 @@ struct audio_driver spice_audio_driver = {
     .max_voices_in  = 1,
     .voice_size_out = sizeof (SpiceVoiceOut),
     .voice_size_in  = sizeof (SpiceVoiceIn),
+#if ((SPICE_INTERFACE_PLAYBACK_MAJOR >= 1) && (SPICE_INTERFACE_PLAYBACK_MINOR >= 2))
+    .ctl_caps       = VOICE_VOLUME_CAP
+#endif
 };
 
 void qemu_spice_audio_init (void)