videotestsrc: Use static sine table

gst/videotestsrc/Makefile.am

@@ -15,4 +15,9 @@ libgstvideotestsrc_la_LIBTOOLFLAGS = --tag=disable-static
 
 noinst_HEADERS = gstvideotestsrc.h videotestsrc.h
 
+noinst_PROGRAMS = generate_sine_table
+
+generate_sine_table_SOURCES = generate_sine_table.c
+generate_sine_table_CFLAGS = $(GST_CFLAGS)
+generate_sine_table_LDADD = $(LIBM)
 

gst/videotestsrc/generate_sine_table.c

@@ -0,0 +1,42 @@
+
+#include <stdio.h>
+#include <math.h>
+
+
+static int
+get_value (int i)
+{
+  int x;
+
+  x = floor (256 * (0.5 + 0.5 * sin (i * 2 * M_PI / 256)));
+  if (x > 255)
+    x = 255;
+  return x;
+}
+
+int
+main (int argc, char *argv[])
+{
+  int i;
+  int j;
+
+  printf ("static const guint8\n");
+  printf ("sine_table[256] = {\n");
+  for (i = 0; i < 256; i += 8) {
+    printf ("  ");
+    for (j = 0; j < 8; j++) {
+      printf ("%3d", get_value (i + j));
+      if (j != 7) {
+        printf (", ");
+      } else {
+        if (i + j != 255) {
+          printf (",\n");
+        } else {
+          printf ("\n");
+        }
+      }
+    }
+  }
+  printf ("};\n");
+
+}

gst/videotestsrc/videotestsrc.c

@@ -1179,6 +1179,42 @@ gst_video_test_src_checkers8 (GstVideoTestSrc * v, guchar * dest, int w, int h)
   }
 }
 
+static const guint8 sine_table[256] = {
+  128, 131, 134, 137, 140, 143, 146, 149,
+  152, 156, 159, 162, 165, 168, 171, 174,
+  176, 179, 182, 185, 188, 191, 193, 196,
+  199, 201, 204, 206, 209, 211, 213, 216,
+  218, 220, 222, 224, 226, 228, 230, 232,
+  234, 236, 237, 239, 240, 242, 243, 245,
+  246, 247, 248, 249, 250, 251, 252, 252,
+  253, 254, 254, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 254, 254,
+  253, 252, 252, 251, 250, 249, 248, 247,
+  246, 245, 243, 242, 240, 239, 237, 236,
+  234, 232, 230, 228, 226, 224, 222, 220,
+  218, 216, 213, 211, 209, 206, 204, 201,
+  199, 196, 193, 191, 188, 185, 182, 179,
+  176, 174, 171, 168, 165, 162, 159, 156,
+  152, 149, 146, 143, 140, 137, 134, 131,
+  128, 124, 121, 118, 115, 112, 109, 106,
+  103, 99, 96, 93, 90, 87, 84, 81,
+  79, 76, 73, 70, 67, 64, 62, 59,
+  56, 54, 51, 49, 46, 44, 42, 39,
+  37, 35, 33, 31, 29, 27, 25, 23,
+  21, 19, 18, 16, 15, 13, 12, 10,
+  9, 8, 7, 6, 5, 4, 3, 3,
+  2, 1, 1, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 1, 1,
+  2, 3, 3, 4, 5, 6, 7, 8,
+  9, 10, 12, 13, 15, 16, 18, 19,
+  21, 23, 25, 27, 29, 31, 33, 35,
+  37, 39, 42, 44, 46, 49, 51, 54,
+  56, 59, 62, 64, 67, 70, 73, 76,
+  79, 81, 84, 87, 90, 93, 96, 99,
+  103, 106, 109, 112, 115, 118, 121, 124
+};
+
+
 void
 gst_video_test_src_zoneplate (GstVideoTestSrc * v, unsigned char *dest,
     int w, int h)
@@ -1189,8 +1225,6 @@ gst_video_test_src_zoneplate (GstVideoTestSrc * v, unsigned char *dest,
   paintinfo *p = π
   struct fourcc_list_struct *fourcc;
   struct vts_color_struct color;
-  static guint8 sine_array[256];
-  static int sine_array_inited = FALSE;
   int t = v->zoneplate_t;
   int xreset = -(w / 2) - v->xoffset;   /* starting values for x^2 and y^2, centering the ellipse */
   int yreset = -(h / 2) - v->yoffset;
@@ -1209,17 +1243,6 @@ gst_video_test_src_zoneplate (GstVideoTestSrc * v, unsigned char *dest,
   int scale_kxy = 0xffff / (w / 2);
   int scale_kx2 = 0xffff / w;
 
-  if (!sine_array_inited) {
-    int black = 16;
-    int white = 235;
-    int range = white - black;
-    for (i = 0; i < 256; i++) {
-      sine_array[i] =
-          floor (range * (0.5 + 0.5 * sin (i * 2 * M_PI / 256)) + 0.5 + black);
-    }
-    sine_array_inited = TRUE;
-  }
-
   videotestsrc_setup_paintinfo (v, p, w, h);
   fourcc = v->fourcc;
   if (fourcc == NULL)
@@ -1257,7 +1280,7 @@ gst_video_test_src_zoneplate (GstVideoTestSrc * v, unsigned char *dest,
           phase + ((v->kx2 * x * x) / w) + ((v->ky2 * y * y) / h) +
           ((v->kt2 * t * t) >> 1);
 
-      color.Y = sine_array[phase & 0xff];
+      color.Y = sine_table[phase & 0xff];
 
       color.R = color.Y;
       color.G = color.Y;
@@ -1306,7 +1329,7 @@ gst_video_test_src_zoneplate (GstVideoTestSrc * v, unsigned char *dest,
       phase = phase + ((v->kx2 * x * x * scale_kx2) >> 16) + ky2 + (kt2 >> 1);
 
       videotestsrc_blend_color (&color, &p->foreground_color,
-          &p->background_color, sine_array[phase & 0xff]);
+          &p->background_color, sine_table[phase & 0xff]);
 
       p->paint_hline (p, i, j, 1);
     }
@@ -1325,8 +1348,6 @@ gst_video_test_src_chromazoneplate (GstVideoTestSrc * v, unsigned char *dest,
   paintinfo *p = &pi;
   struct fourcc_list_struct *fourcc;
   struct vts_color_struct color;
-  static guint8 sine_array[256];
-  static int sine_array_inited = FALSE;
   int t = v->zoneplate_t;
 
   int xreset = -(w / 2) - v->xoffset;   /* starting values for x^2 and y^2, centering the ellipse */
@@ -1346,17 +1367,6 @@ gst_video_test_src_chromazoneplate (GstVideoTestSrc * v, unsigned char *dest,
   int scale_kxy = 0xffff / (w / 2);
   int scale_kx2 = 0xffff / w;
 
-  if (!sine_array_inited) {
-    int black = 16;
-    int white = 235;
-    int range = white - black;
-    for (i = 0; i < 256; i++) {
-      sine_array[i] =
-          floor (range * (0.5 + 0.5 * sin (i * 2 * M_PI / 256)) + 0.5 + black);
-    }
-    sine_array_inited = TRUE;
-  }
-
   videotestsrc_setup_paintinfo (v, p, w, h);
   fourcc = v->fourcc;
   if (fourcc == NULL)
@@ -1413,8 +1423,8 @@ gst_video_test_src_chromazoneplate (GstVideoTestSrc * v, unsigned char *dest,
       phase = phase + ((v->kx2 * x * x * scale_kx2) >> 16) + ky2 + (kt2 >> 1);
 
       color.Y = 128;
-      color.U = sine_array[phase & 0xff];
+      color.U = sine_table[phase & 0xff];
-      color.V = sine_array[phase & 0xff];
+      color.V = sine_table[phase & 0xff];
 
       color.R = 128;
       color.G = 128;
@@ -1439,8 +1449,6 @@ gst_video_test_src_circular (GstVideoTestSrc * v, unsigned char *dest,
   paintinfo *p = &pi;
   struct fourcc_list_struct *fourcc;
   struct vts_color_struct color;
-  static guint8 sine_array[256];
-  static int sine_array_inited = FALSE;
   double freq[8];
 
 #ifdef SCALE_AMPLITUDE
@@ -1448,14 +1456,6 @@ gst_video_test_src_circular (GstVideoTestSrc * v, unsigned char *dest,
 #endif
   int d;
 
-  if (!sine_array_inited) {
-    for (i = 0; i < 256; i++) {
-      sine_array[i] =
-          floor (255 * (0.5 + 0.5 * sin (i * 2 * M_PI / 256)) + 0.5);
-    }
-    sine_array_inited = TRUE;
-  }
-
   videotestsrc_setup_paintinfo (v, p, w, h);
   fourcc = v->fourcc;
   if (fourcc == NULL)
@@ -1499,10 +1499,10 @@ gst_video_test_src_circular (GstVideoTestSrc * v, unsigned char *dest,
         if (a < 0)
           a = 0;
         videotestsrc_blend_color (&color, &p->foreground_color,
-            &p->background_color, 128 + a * (sine_array[d & 0xff] - 128));
+            &p->background_color, 128 + a * (sine_table[d & 0xff] - 128));
 #else
         videotestsrc_blend_color (&color, &p->foreground_color,
-            &p->background_color, sine_array[d & 0xff]);
+            &p->background_color, sine_table[d & 0xff]);
 #endif
       }
       p->paint_hline (p, i, j, 1);