Merge commit '9d58639e270f7612874681e0ca30fa461e2667b7'

[ffmpeg] / libavcodec / aacenc_tns.h

diff --git a/libavcodec/aacenc_tns.h b/libavcodec/aacenc_tns.h
index 3b11ca03b9cbd996500f2cc8ef50a3f64f373e64..f0e75569ae2ac8323df1c9e156713089ce9c9fb0 100644 (file)
--- a/libavcodec/aacenc_tns.h
+++ b/libavcodec/aacenc_tns.h
@@ -28,18 +28,25 @@
 #ifndef AVCODEC_AACENC_TNS_H
 #define AVCODEC_AACENC_TNS_H
 
-#include "aac.h"
+#include "aacenc.h"
 
-/** Frequency in Hz for lower limit of TNS **/
-#define TNS_LOW_LIMIT 2150
+/* Could be set to 3 to save an additional bit at the cost of little quality */
+#define TNS_Q_BITS 4
 
-/** LPC settings */
-#define TNS_MIN_PRED_ORDER 0
-#define MAX_LPC_PRECISION  4   /* 4 bits ltp coeff precision */
-#define TNS_LPC_PASSES     2
-#define MAX_LPC_SHIFT      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
 
-void encode_tns_info(AACEncContext *s, SingleChannelElement *sce);
-void search_for_tns(AACEncContext *s, SingleChannelElement *sce);
+/* 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);
 
 #endif /* AVCODEC_AACENC_TNS_H */