Shrinks tansig table, makes data static const

3 files changed, 17 insertions, 71 deletions

diff --git a/src/analysis.c b/src/analysis.c
index a7a89194..6742a85c 100644
--- a/src/analysis.c
+++ b/src/analysis.c
@@ -44,7 +44,7 @@ extern const MLP net;
 #define M_PI 3.141592653
 #endif
 
-float dct_table[128] = {
+static const float dct_table[128] = {
         0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000,
         0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000,
         0.351851, 0.338330, 0.311806, 0.273300, 0.224292, 0.166664, 0.102631, 0.034654,
@@ -63,7 +63,7 @@ float dct_table[128] = {
         0.224292, 0.311806, -0.102631, -0.351851, -0.034654, 0.338330, 0.166664, -0.273300,
 };
 
-float analysis_window[240] = {
+static const float analysis_window[240] = {
       0.000043f, 0.000171f, 0.000385f, 0.000685f, 0.001071f, 0.001541f, 0.002098f, 0.002739f,
       0.003466f, 0.004278f, 0.005174f, 0.006156f, 0.007222f, 0.008373f, 0.009607f, 0.010926f,
       0.012329f, 0.013815f, 0.015385f, 0.017037f, 0.018772f, 0.020590f, 0.022490f, 0.024472f,
@@ -100,9 +100,9 @@ static const int tbands[NB_TBANDS+1] = {
        2,  4,  6,  8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56, 68, 80, 96, 120
 };
 
-static const float tweight[NB_TBANDS+1] = {
+/*static const float tweight[NB_TBANDS+1] = {
       .3, .4, .5, .6, .7, .8, .9, 1., 1., 1., 1., 1., 1., 1., .8, .7, .6, .5
-};
+};*/
 
 #define NB_TONAL_SKIP_BANDS 9
 
diff --git a/src/mlp.c b/src/mlp.c
index 200f1cb3..dd3690db 100644
--- a/src/mlp.c
+++ b/src/mlp.c
@@ -64,16 +64,22 @@ static inline double tansig_approx(double x)
 {
 	int i;
 	double y, dy;
-	if (x>=10)
-		return 1;
-	if (x<=-10)
-		return -1;
+	double sign=1;
+    if (x>=8)
+        return 1;
+    if (x<=-8)
+        return -1;
+	if (x<0)
+	{
+	   x=-x;
+	   sign=-1;
+	}
 	i = lrint(25*x);
 	x -= .04*i;
-	y = tansig_table[250+i];
+	y = tansig_table[i];
 	dy = 1-y*y;
 	y = y + x*dy*(1 - y*x);
-	return y;
+	return sign*y;
 }
 #endif
 
diff --git a/src/tansig_table.h b/src/tansig_table.h
index ccf43daa..a5aba230 100644
--- a/src/tansig_table.h
+++ b/src/tansig_table.h
@@ -1,56 +1,6 @@
 /* This file is auto-generated by gen_tables */
 
-static const opus_val16 tansig_table[501] = {
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -1.000000, -1.000000, -1.000000, -1.000000, 
--1.000000, -0.999999, -0.999999, -0.999999, -0.999999, 
--0.999999, -0.999999, -0.999999, -0.999999, -0.999999, 
--0.999999, -0.999999, -0.999999, -0.999999, -0.999998, 
--0.999998, -0.999998, -0.999998, -0.999998, -0.999998, 
--0.999997, -0.999997, -0.999997, -0.999997, -0.999997, 
--0.999996, -0.999996, -0.999996, -0.999995, -0.999995, 
--0.999994, -0.999994, -0.999994, -0.999993, -0.999992, 
--0.999992, -0.999991, -0.999990, -0.999990, -0.999989, 
--0.999988, -0.999987, -0.999986, -0.999984, -0.999983, 
--0.999982, -0.999980, -0.999978, -0.999977, -0.999975, 
--0.999973, -0.999970, -0.999968, -0.999965, -0.999962, 
--0.999959, -0.999956, -0.999952, -0.999948, -0.999944, 
--0.999939, -0.999934, -0.999929, -0.999923, -0.999916, 
--0.999909, -0.999902, -0.999893, -0.999885, -0.999875, 
--0.999865, -0.999853, -0.999841, -0.999828, -0.999813, 
--0.999798, -0.999781, -0.999763, -0.999743, -0.999722, 
--0.999699, -0.999673, -0.999646, -0.999617, -0.999585, 
--0.999550, -0.999513, -0.999472, -0.999428, -0.999381, 
--0.999329, -0.999273, -0.999213, -0.999147, -0.999076, 
--0.999000, -0.998916, -0.998826, -0.998728, -0.998623, 
--0.998508, -0.998384, -0.998249, -0.998104, -0.997946, 
--0.997775, -0.997590, -0.997389, -0.997172, -0.996937, 
--0.996682, -0.996407, -0.996108, -0.995784, -0.995434, 
--0.995055, -0.994644, -0.994199, -0.993718, -0.993196, 
--0.992631, -0.992020, -0.991359, -0.990642, -0.989867, 
--0.989027, -0.988119, -0.987136, -0.986072, -0.984921, 
--0.983675, -0.982327, -0.980869, -0.979293, -0.977587, 
--0.975743, -0.973749, -0.971594, -0.969265, -0.966747, 
--0.964028, -0.961090, -0.957917, -0.954492, -0.950795, 
--0.946806, -0.942503, -0.937863, -0.932862, -0.927473, 
--0.921669, -0.915420, -0.908698, -0.901468, -0.893698, 
--0.885352, -0.876393, -0.866784, -0.856485, -0.845456, 
--0.833655, -0.821040, -0.807569, -0.793199, -0.777888, 
--0.761594, -0.744277, -0.725897, -0.706419, -0.685809, 
--0.664037, -0.641077, -0.616909, -0.591519, -0.564900, 
--0.537050, -0.507977, -0.477700, -0.446244, -0.413644, 
--0.379949, -0.345214, -0.309507, -0.272905, -0.235496, 
--0.197375, -0.158649, -0.119427, -0.079830, -0.039979, 
+static const opus_val16 tansig_table[201] = {
 0.000000, 0.039979, 0.079830, 0.119427, 0.158649, 
 0.197375, 0.235496, 0.272905, 0.309507, 0.345214, 
 0.379949, 0.413644, 0.446244, 0.477700, 0.507977, 
@@ -91,15 +41,5 @@ static const opus_val16 tansig_table[501] = {
 0.999999, 0.999999, 0.999999, 0.999999, 0.999999, 
 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
-1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 
 1.000000, 
 };