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- $OpenBSD: patch-libavcodec_aacenc_tns_h,v 1.2 2015/10/25 08:46:41 ajacoutot Exp $
- aacenc_tns: redo coefficient quantization and decision making
- aacenc_tns: readjust values for new TNS decision making
- acenc_tns: rework TNS descision logic
- --- libavcodec/aacenc_tns.h.orig Mon Sep 7 21:58:01 2015
- +++ libavcodec/aacenc_tns.h Sun Oct 18 22:26:54 2015
- @@ -30,21 +30,6 @@
-
- #include "aacenc.h"
-
- -/* Could be set to 3 to save an additional bit at the cost of little quality */
- -#define TNS_Q_BITS 4
- -
- -/* TNS will only be used if the LPC gain is within these margins */
- -#define TNS_GAIN_THRESHOLD_LOW 1.395f
- -#define TNS_GAIN_THRESHOLD_HIGH 11.19f
- -
- -/* If the energy ratio between the low SFBs vs the high SFBs is not between
- - * those two values, use 2 filters instead */
- -#define TNS_E_RATIO_LOW 0.77
- -#define TNS_E_RATIO_HIGH 1.23
- -
- -/* Do not use TNS if the psy band spread is below this value */
- -#define TNS_SPREAD_THRESHOLD 37.081512f
- -
- void ff_aac_encode_tns_info(AACEncContext *s, SingleChannelElement *sce);
- void ff_aac_apply_tns(AACEncContext *s, SingleChannelElement *sce);
- void ff_aac_search_for_tns(AACEncContext *s, SingleChannelElement *sce);
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