stream: Simplify passing of formats in extended API

Passing a NULL-terminated array of pa_format_info pointers is a bit
unwieldy for clients. Instead of this, let's pass in an array of
pointers and the number of elements in the array.

src/pulse/stream.c

@@ -86,14 +86,16 @@ static pa_stream *pa_stream_new_with_proplist_internal(
         const pa_sample_spec *ss,
         const pa_channel_map *map,
         pa_format_info * const *formats,
+        unsigned int n_formats,
         pa_proplist *p) {
 
     pa_stream *s;
-    int i;
+    unsigned int i;
 
     pa_assert(c);
     pa_assert(PA_REFCNT_VALUE(c) >= 1);
-    pa_assert((ss == NULL && map == NULL) || formats == NULL);
+    pa_assert((ss == NULL && map == NULL) || (formats == NULL && n_formats == 0));
+    pa_assert(n_formats < PA_MAX_FORMATS);
 
     PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
     PA_CHECK_VALIDITY_RETURN_NULL(c, name || (p && pa_proplist_contains(p, PA_PROP_MEDIA_NAME)), PA_ERR_INVALID);
@@ -119,13 +121,10 @@ static pa_stream *pa_stream_new_with_proplist_internal(
 
     s->n_formats = 0;
     if (formats) {
-        for (i = 0; formats[i] && i < PA_MAX_FORMATS; i++) {
+        s->n_formats = n_formats;
-            s->n_formats++;
+        for (i = 0; i < n_formats; i++)
             s->req_formats[i] = pa_format_info_copy(formats[i]);
     }
-        /* Make sure the input array was NULL-terminated */
-        pa_assert(formats[i] == NULL);
-    }
 
     /* We'll get the final negotiated format after connecting */
     s->format = NULL;
@@ -221,18 +220,19 @@ pa_stream *pa_stream_new_with_proplist(
     if (!map)
         PA_CHECK_VALIDITY_RETURN_NULL(c, map = pa_channel_map_init_auto(&tmap, ss->channels, PA_CHANNEL_MAP_DEFAULT), PA_ERR_INVALID);
 
-    return pa_stream_new_with_proplist_internal(c, name, ss, map, NULL, p);
+    return pa_stream_new_with_proplist_internal(c, name, ss, map, NULL, 0, p);
 }
 
 pa_stream *pa_stream_new_extended(
         pa_context *c,
         const char *name,
         pa_format_info * const *formats,
+        unsigned int n_formats,
         pa_proplist *p) {
 
     PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 21, PA_ERR_NOTSUPPORTED);
 
-    return pa_stream_new_with_proplist_internal(c, name, NULL, NULL, formats, p);
+    return pa_stream_new_with_proplist_internal(c, name, NULL, NULL, formats, n_formats, p);
 }
 
 static void stream_unlink(pa_stream *s) {

src/pulse/stream.h

@@ -365,6 +365,7 @@ pa_stream *pa_stream_new_extended(
         pa_context *c                     /**< The context to create this stream in */,
         const char *name                  /**< A name for this stream */,
         pa_format_info * const * formats  /**< The list of formats that can be provided */,
+        unsigned int n_formats            /**< The number of formats being passed in */,
         pa_proplist *p                    /**< The initial property list */);
 
 /** Decrease the reference counter by one */

src/tests/extended-test.c

@@ -122,7 +122,7 @@ static void context_state_callback(pa_context *c, void *userdata) {
 
             for (i = 0; i < NSTREAMS; i++) {
                 char name[64];
-                pa_format_info *formats[2] = { NULL };
+                pa_format_info *formats[1];
 
                 formats[0] = pa_format_info_new();
                 formats[0]->encoding = PA_ENCODING_PCM;
@@ -134,10 +134,12 @@ static void context_state_callback(pa_context *c, void *userdata) {
 
                 snprintf(name, sizeof(name), "stream #%i", i);
 
-                streams[i] = pa_stream_new_extended(c, name, formats, NULL);
+                streams[i] = pa_stream_new_extended(c, name, formats, 1, NULL);
                 assert(streams[i]);
                 pa_stream_set_state_callback(streams[i], stream_state_callback, (void*) (long) i);
                 pa_stream_connect_playback(streams[i], NULL, &buffer_attr, PA_STREAM_START_CORKED, NULL, i == 0 ? NULL : streams[0]);
+
+                pa_format_info_free(formats[0]);
             }
 
             break;