[FFmpeg-soc] [soc]: r4791 - amr/amrnbfloatdec.c

[cmcq]

Author: cmcq
Date: Thu Jul 23 17:38:29 2009
New Revision: 4791

Log:
Disable anti-sparseness filter for low levels of fixed gain
anti_sparseness now gets the same impNr as the ref decoder (in my tests).

Modified:
   amr/amrnbfloatdec.c

Modified: amr/amrnbfloatdec.c
==============================================================================
--- amr/amrnbfloatdec.c	Thu Jul 23 16:14:36 2009	(r4790)
+++ amr/amrnbfloatdec.c	Thu Jul 23 17:38:29 2009	(r4791)
@@ -876,7 +876,11 @@ static void anti_sparseness(AMRContext *
         ir_filter_strength++;
     }
 
-    //FIXME: disable filtering for very low level of fixed_gain
+    // Disable filtering for very low level of fixed_gain.
+    // Note this step is not specified in the technical description but is in
+    // the reference source in the function Ph_disp.
+    if (fixed_gain < 5.0)
+        ir_filter_strength = 2;
 
     if (p->cur_frame_mode != MODE_74 && p->cur_frame_mode < MODE_102 && ir_filter_strength < 2) {
         const float **filters = p->cur_frame_mode == MODE_795 ? ir_filters_lookup_MODE_795