mixer-control: Expose stream state

The state can be used to determine whether audio is currently playing
or not, which can be useful information.

https://gitlab.gnome.org/GNOME/libgnome-volume-control/merge_requests/8

gvc-mixer-control.c

@@ -1452,6 +1452,21 @@ set_icon_name_from_proplist (GvcMixerStream *stream,
         gvc_mixer_stream_set_icon_name (stream, t);
 }
 
+static GvcMixerStreamState
+translate_pa_state (pa_sink_state_t state) {
+        switch (state) {
+        case PA_SINK_RUNNING:
+                return GVC_STREAM_STATE_RUNNING;
+        case PA_SINK_IDLE:
+                return GVC_STREAM_STATE_IDLE;
+        case PA_SINK_SUSPENDED:
+                return GVC_STREAM_STATE_SUSPENDED;
+        case PA_SINK_INVALID_STATE:
+        default:
+                return GVC_STREAM_STATE_INVALID;
+        }
+}
+
 /*
  * Called when anything changes with a sink.
  */
@@ -1521,6 +1536,7 @@ update_sink (GvcMixerControl    *control,
         gvc_mixer_stream_set_is_muted (stream, info->mute);
         gvc_mixer_stream_set_can_decibel (stream, !!(info->flags & PA_SINK_DECIBEL_VOLUME));
         gvc_mixer_stream_set_base_volume (stream, (guint32) info->base_volume);
+        gvc_mixer_stream_set_state (stream, translate_pa_state (info->state));
 
         /* Messy I know but to set the port everytime regardless of whether it has changed will cost us a
          * port change notify signal which causes the frontend to resync.

gvc-mixer-stream.c

@@ -32,6 +32,7 @@
 #include "gvc-mixer-stream.h"
 #include "gvc-mixer-stream-private.h"
 #include "gvc-channel-map-private.h"
+#include "gvc-enum-types.h"
 
 static guint32 stream_serial = 1;
 
@@ -57,6 +58,7 @@ struct GvcMixerStreamPrivate
         char          *port;
         char          *human_port;
         GList         *ports;
+        GvcMixerStreamState state;
 };
 
 enum
@@ -80,6 +82,7 @@ enum
         PROP_IS_VIRTUAL,
         PROP_CARD_INDEX,
         PROP_PORT,
+        PROP_STATE,
 };
 
 static void     gvc_mixer_stream_finalize   (GObject            *object);
@@ -580,6 +583,27 @@ gvc_mixer_stream_get_ports (GvcMixerStream *stream)
         return stream->priv->ports;
 }
 
+gboolean
+gvc_mixer_stream_set_state (GvcMixerStream      *stream,
+                            GvcMixerStreamState  state)
+{
+        g_return_val_if_fail (GVC_IS_MIXER_STREAM (stream), FALSE);
+
+        if (stream->priv->state != state) {
+                stream->priv->state = state;
+                g_object_notify (G_OBJECT (stream), "state");
+        }
+
+        return TRUE;
+}
+
+GvcMixerStreamState
+gvc_mixer_stream_get_state (GvcMixerStream      *stream)
+{
+        g_return_val_if_fail (GVC_IS_MIXER_STREAM (stream), GVC_STREAM_STATE_INVALID);
+        return stream->priv->state;
+}
+
 static int
 sort_ports (GvcMixerStreamPort *a,
             GvcMixerStreamPort *b)
@@ -686,6 +710,9 @@ gvc_mixer_stream_set_property (GObject       *object,
         case PROP_PORT:
                 gvc_mixer_stream_set_port (self, g_value_get_string (value));
                 break;
+        case PROP_STATE:
+                gvc_mixer_stream_set_state (self, g_value_get_enum (value));
+                break;
         case PROP_CARD_INDEX:
                 self->priv->card_index = g_value_get_long (value);
                 break;
@@ -757,6 +784,9 @@ gvc_mixer_stream_get_property (GObject     *object,
         case PROP_PORT:
                 g_value_set_string (value, self->priv->port);
                 break;
+        case PROP_STATE:
+                g_value_set_enum (value, self->priv->state);
+                break;
         case PROP_CARD_INDEX:
                 g_value_set_long (value, self->priv->card_index);
                 break;
@@ -986,6 +1016,14 @@ gvc_mixer_stream_class_init (GvcMixerStreamClass *klass)
                                                               "The name of the current port for this stream",
                                                               NULL,
                                                               G_PARAM_READWRITE));
+        g_object_class_install_property (gobject_class,
+                                         PROP_STATE,
+                                         g_param_spec_enum ("state",
+                                                            "State",
+                                                            "The current state of this stream",
+                                                            GVC_TYPE_MIXER_STREAM_STATE,
+                                                            GVC_STREAM_STATE_INVALID,
+                                                            G_PARAM_READWRITE));
         g_object_class_install_property (gobject_class,
                                          PROP_CARD_INDEX,
                                          g_param_spec_long ("card-index",

gvc-mixer-stream.h

@@ -64,6 +64,14 @@ typedef struct
         gboolean available;
 } GvcMixerStreamPort;
 
+typedef enum
+{
+        GVC_STREAM_STATE_INVALID,
+        GVC_STREAM_STATE_RUNNING,
+        GVC_STREAM_STATE_IDLE,
+        GVC_STREAM_STATE_SUSPENDED
+} GvcMixerStreamState;
+
 GType               gvc_mixer_stream_port_get_type   (void) G_GNUC_CONST;
 GType               gvc_mixer_stream_get_type        (void) G_GNUC_CONST;
 
@@ -95,6 +103,7 @@ const char *        gvc_mixer_stream_get_application_id (GvcMixerStream *stream)
 gboolean            gvc_mixer_stream_is_event_stream (GvcMixerStream *stream);
 gboolean            gvc_mixer_stream_is_virtual      (GvcMixerStream *stream);
 guint               gvc_mixer_stream_get_card_index  (GvcMixerStream *stream);
+GvcMixerStreamState gvc_mixer_stream_get_state       (GvcMixerStream *stream);
 
 /* private */
 gboolean            gvc_mixer_stream_set_volume      (GvcMixerStream *stream,
@@ -129,6 +138,8 @@ gboolean            gvc_mixer_stream_set_ports       (GvcMixerStream *stream,
                                                       GList          *ports);
 gboolean            gvc_mixer_stream_set_card_index  (GvcMixerStream *stream,
                                                       guint           card_index);
+gboolean            gvc_mixer_stream_set_state       (GvcMixerStream      *stream,
+                                                      GvcMixerStreamState  state);
 
 G_END_DECLS
 

meson.build

@@ -1,5 +1,5 @@
 project('gvc', 'c',
-  meson_version: '>= 0.38.0',
+  meson_version: '>= 0.42.0',
   default_options: ['static=true']
 )
 
@@ -27,6 +27,10 @@ libgvc_gir_headers = [
   'gvc-mixer-ui-device.h'
 ]
 
+libgvc_enums = gnome.mkenums_simple('gvc-enum-types',
+  sources: libgvc_gir_headers
+)
+
 libgvc_gir_sources = [
   'gvc-channel-map.c',
   'gvc-mixer-card.c',
@@ -75,7 +79,7 @@ endif
 
 if enable_static
   libgvc_static = static_library('gvc',
-    sources: libgvc_gir_sources + libgvc_no_gir_sources,
+    sources: libgvc_gir_sources + libgvc_no_gir_sources + libgvc_enums,
     dependencies: libgvc_deps,
     c_args: c_args
   )
@@ -87,7 +91,7 @@ else
   endif
 
   libgvc_shared = shared_library('gvc',
-    sources: libgvc_gir_sources + libgvc_no_gir_sources,
+    sources: libgvc_gir_sources + libgvc_no_gir_sources + libgvc_enums,
     dependencies: libgvc_deps,
     c_args: c_args,
     install_dir: pkglibdir,
@@ -101,7 +105,7 @@ if enable_introspection
   assert(pkgdatadir != '', 'Installing introspection, but pkgdatadir is unset!')
 
   libgvc_gir = gnome.generate_gir(libgvc,
-    sources: libgvc_gir_sources + libgvc_gir_headers,
+    sources: libgvc_gir_sources + libgvc_gir_headers + libgvc_enums,
     nsversion: '1.0',
     namespace: 'Gvc',
     includes: ['Gio-2.0', 'GObject-2.0'],