stream_filter/httplive.c: seeking in segments not downloaded yet. (WIP)

Allow seeking in segments not downloaded yet. Since the exact file size
for future segments is unknown seeking will be inaccurate.

modules/stream_filter/httplive.c

@@ -1432,19 +1432,28 @@ static int segment_Seek(stream_t *s, uint64_t pos)
     uint64_t length = 0;
     bool b_found = false;
 
+    vlc_mutex_lock(&hls->lock);
     int count = vlc_array_count(hls->segments);
-    for (int n = 0; n < count; n++)
+    vlc_mutex_unlock(&hls->lock);
+
+    for (int n = 0; n < count && !b_found; n++)
     {
         /* FIXME: Seeking in segments not dowloaded is not supported. */
+        vlc_mutex_lock(&hls->lock);
         if (n >= hls->segment)
         {
             msg_Err(s, "seeking in segment not downloaded yet.");
+            vlc_mutex_unlock(&hls->lock);
             return VLC_EGENERIC;
         }
 
         segment_t *segment = vlc_array_item_at_index(hls->segments, n);
         if (segment == NULL)
+        {
+            vlc_mutex_unlock(&hls->lock);
             return VLC_EGENERIC;
+        }
+        vlc_mutex_unlock(&hls->lock);
 
         vlc_mutex_lock(&segment->lock);
         length += segment->size;