av_hwaccel_next() by Gwenole Beauchesne.

Originally committed as revision 17567 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/utils.c

@@ -1135,3 +1135,8 @@ void av_register_hwaccel(AVHWAccel *hwaccel)
     *p = hwaccel;
     hwaccel->next = NULL;
 }
+
+AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
+{
+    return hwaccel ? hwaccel->next : first_hwaccel;
+}