av_hwaccel_next() by Gwenole Beauchesne.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17567 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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;
+}