X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Faacenc_tns.h;h=f0e75569ae2ac8323df1c9e156713089ce9c9fb0;hb=cebe51a6255e04b8dcd15fcbab359ed00dbb3ab1;hp=72c91239a38f74e7032d4560d047e81fff69f82d;hpb=ea1061e147d33e33281570631cab7fdc1195e065;p=ffmpeg

diff --git a/libavcodec/aacenc_tns.h b/libavcodec/aacenc_tns.h
index 72c91239a38..f0e75569ae2 100644
--- a/libavcodec/aacenc_tns.h
+++ b/libavcodec/aacenc_tns.h
@@ -30,11 +30,23 @@
 
 #include "aacenc.h"
 
-/** Lower limit of TNS in SFBs **/
-#define TNS_LOW_LIMIT 24
+/* 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(SingleChannelElement *sce);
+void ff_aac_apply_tns(AACEncContext *s, SingleChannelElement *sce);
 void ff_aac_search_for_tns(AACEncContext *s, SingleChannelElement *sce);
 
 #endif /* AVCODEC_AACENC_TNS_H */