introspect: Get formats for sinks

This gets the list of supported formats for a sink in
pa_context_get_sink_info*(). Also prints these in 'pactl list'.

PROTOCOL

@@ -228,3 +228,11 @@ New fields PA_COMMAND_CREATE_PLAYBACK_STREAM:
 One new field in reply from PA_COMMAND_CREATE_PLAYBACK_STREAM:
 
     format_info format
+
+New fields in reply from PA_COMMAND_GET_SINK_INFO (and thus
+PA_COMMAND_GET_SINK_INFO_LIST)
+
+    uint8_t n_formats
+    format_info format1
+    ...
+    format_info formatn

src/pulse/introspect.c

@@ -240,6 +240,33 @@ static void context_get_sink_info_callback(pa_pdispatch *pd, uint32_t command, u
                 }
             }
 
+            if (o->context->version >= 21) {
+                i.formats = NULL;
+
+                if (pa_tagstruct_getu8(t, &i.n_formats)) {
+                    pa_context_fail(o->context, PA_ERR_PROTOCOL);
+                    pa_proplist_free(i.proplist);
+                    goto finish;
+                }
+
+                pa_assert(i.n_formats > 0);
+                i.formats = pa_xnew0(pa_format_info*, i.n_formats);
+
+                for (j = 0; j < i.n_formats; j++) {
+                    i.formats[j] = pa_format_info_new();
+                    if (pa_tagstruct_get_format_info(t, i.formats[j]) < 0) {
+                        do {
+                            pa_format_info_free(i.formats[j]);
+                        } while (j--);
+                        pa_xfree(i.formats);
+
+                        pa_context_fail(o->context, PA_ERR_PROTOCOL);
+                        pa_proplist_free(i.proplist);
+                        goto finish;
+                    }
+                }
+            }
+
             i.mute = (int) mute;
             i.flags = (pa_sink_flags_t) flags;
             i.state = (pa_sink_state_t) state;
@@ -253,6 +280,13 @@ static void context_get_sink_info_callback(pa_pdispatch *pd, uint32_t command, u
                 pa_xfree(i.ports[0]);
                 pa_xfree(i.ports);
             }
+
+            if (i.formats) {
+                for (j = 0; j < i.n_formats; j++)
+                    pa_format_info_free(i.formats[j]);
+                pa_xfree(i.formats);
+            }
+
             pa_proplist_free(i.proplist);
         }
     }

src/pulse/introspect.h

@@ -32,6 +32,7 @@
 #include <pulse/channelmap.h>
 #include <pulse/volume.h>
 #include <pulse/proplist.h>
+#include <pulse/format.h>
 #include <pulse/version.h>
 
 /** \page introspect Server Query and Control
@@ -230,6 +231,8 @@ typedef struct pa_sink_info {
     uint32_t n_ports;                  /**< Number of entries in port array \since 0.9.16 */
     pa_sink_port_info** ports;         /**< Array of available ports, or NULL. Array is terminated by an entry set to NULL. The number of entries is stored in n_ports \since 0.9.16 */
     pa_sink_port_info* active_port;    /**< Pointer to active port in the array, or NULL \since 0.9.16 */
+    uint8_t n_formats;                 /**< Number of formats supported by the sink. \since 1.0 */
+    pa_format_info **formats;          /**< Array of formats supported by the sink. \since 1.0 */
 } pa_sink_info;
 
 /** Callback prototype for pa_context_get_sink_info_by_name() and friends */

src/pulsecore/protocol-native.c

@@ -2984,6 +2984,19 @@ static void sink_fill_tagstruct(pa_native_connection *c, pa_tagstruct *t, pa_sin
 
         pa_tagstruct_puts(t, sink->active_port ? sink->active_port->name : NULL);
     }
+
+    if (c->version >= 21) {
+        uint32_t i;
+        pa_format_info *f;
+        pa_idxset *formats = pa_sink_get_formats(sink);
+
+        pa_tagstruct_putu8(t, (uint8_t) pa_idxset_size(formats));
+        PA_IDXSET_FOREACH(f, formats, i) {
+            pa_tagstruct_put_format_info(t, f);
+        }
+
+        pa_idxset_free(formats, (pa_free2_cb_t) pa_format_info_free2, NULL);
+    }
 }
 
 static void source_fill_tagstruct(pa_native_connection *c, pa_tagstruct *t, pa_source *source) {

src/utils/pactl.c

@@ -222,7 +222,8 @@ static void get_sink_info_callback(pa_context *c, const pa_sink_info *i, int is_
         cvdb[PA_SW_CVOLUME_SNPRINT_DB_MAX],
         v[PA_VOLUME_SNPRINT_MAX],
         vdb[PA_SW_VOLUME_SNPRINT_DB_MAX],
-        cm[PA_CHANNEL_MAP_SNPRINT_MAX];
+        cm[PA_CHANNEL_MAP_SNPRINT_MAX],
+        f[PA_FORMAT_INFO_SNPRINT_MAX];
     char *pl;
 
     if (is_last < 0) {
@@ -307,6 +308,14 @@ static void get_sink_info_callback(pa_context *c, const pa_sink_info *i, int is_
     if (i->active_port)
         printf(_("\tActive Port: %s\n"),
                i->active_port->name);
+
+    if (i->formats) {
+        uint8_t j;
+
+        printf(_("\tFormats:\n"));
+        for (j = 0; j < i->n_formats; j++)
+            printf("\t\t%s\n", pa_format_info_snprint(f, sizeof(f), i->formats[j]));
+    }
 }
 
 static void get_source_info_callback(pa_context *c, const pa_source_info *i, int is_last, void *userdata) {