alternative test video generator by (Sebastien Bechet <s dot bechet at av7 dot net>)

Originally committed as revision 1754 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/rotozoom.c

+/*
+ * Generates a synthetic YUV video sequence suitable for codec testing.
+ * GPLv2
+ * rotozoom.c -> s.bechet@av7.net
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#define SCALEBITS 8
+#define ONE_HALF  (1 << (SCALEBITS - 1))
+#define FIX(x)		((int) ((x) * (1L<<SCALEBITS) + 0.5))
+typedef unsigned char UINT8;
+
+static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
+                              UINT8 *src, int width, int height)
+{
+    int wrap, wrap3, x, y;
+    int r, g, b, r1, g1, b1;
+    UINT8 *p;
+
+    wrap = width;
+    wrap3 = width * 3;
+    p = src;
+    for(y=0;y<height;y+=2) {
+        for(x=0;x<width;x+=2) {
+            r = p[0];
+            g = p[1];
+            b = p[2];
+            r1 = r;
+            g1 = g;
+            b1 = b;
+            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
+                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
+            r = p[3];
+            g = p[4];
+            b = p[5];
+            r1 += r;
+            g1 += g;
+            b1 += b;
+            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
+                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
+            p += wrap3;
+            lum += wrap;
+
+            r = p[0];
+            g = p[1];
+            b = p[2];
+            r1 += r;
+            g1 += g;
+            b1 += b;
+            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 
+                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
+            r = p[3];
+            g = p[4];
+            b = p[5];
+            r1 += r;
+            g1 += g;
+            b1 += b;
+            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 
+                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
+            
+            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 
+                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
+            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 
+                     FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
+
+            cb++;
+            cr++;
+            p += -wrap3 + 2 * 3;
+            lum += -wrap + 2;
+        }
+        p += wrap3;
+        lum += wrap;
+    }
+}
+
+/* cif format */
+#define DEFAULT_WIDTH   352
+#define DEFAULT_HEIGHT  288
+#define DEFAULT_NB_PICT 360
+
+void pgmyuv_save(const char *filename, int w, int h,
+                 unsigned char *rgb_tab)
+{
+    FILE *f;
+    int i, h2, w2;
+    unsigned char *cb, *cr;
+    unsigned char *lum_tab, *cb_tab, *cr_tab;
+
+    lum_tab = malloc(w * h);
+    cb_tab = malloc((w * h) / 4);
+    cr_tab = malloc((w * h) / 4);
+
+    rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
+
+    f = fopen(filename,"w");
+    fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
+    fwrite(lum_tab, 1, w * h, f);
+    h2 = h / 2;
+    w2 = w / 2;
+    cb = cb_tab;
+    cr = cr_tab;
+    for(i=0;i<h2;i++) {
+        fwrite(cb, 1, w2, f);
+        fwrite(cr, 1, w2, f);
+        cb += w2;
+        cr += w2;
+    }
+    fclose(f);
+
+    free(lum_tab);
+    free(cb_tab);
+    free(cr_tab);
+}
+
+unsigned char *rgb_tab;
+int width, height, wrap;
+
+void put_pixel(int x, int y, int r, int g, int b)
+{
+    unsigned char *p;
+
+    if (x < 0 || x >= width ||
+        y < 0 || y >= height)
+        return;
+
+    p = rgb_tab + y * wrap + x * 3;
+    p[0] = r;
+    p[1] = g;
+    p[2] = b;
+}
+
+unsigned char tab_r[256*256];
+unsigned char tab_g[256*256];
+unsigned char tab_b[256*256];
+
+int teta = 0;
+int h_cos [360];
+int h_sin [360];
+
+void gen_image(int num, int w, int h)
+{
+  const int c = h_cos [teta];
+  const int s = h_sin [teta];
+  
+  const int xi = -(w/2) * c;
+  const int yi =  (w/2) * s;
+  
+  const int xj = -(h/2) * s;
+  const int yj = -(h/2) * c;
+  
+  unsigned dep;
+  int i,j;
+  
+  int x,y;
+  int xprime = xj;
+  int yprime = yj;
+
+
+  for (j=0;j<h;j++) {
+
+    x = xprime + xi;
+    xprime += s;
+
+    y = yprime + yi;
+    yprime += c;
+      
+    for ( i=0 ; i<w ; i++ ) {
+      x += c;
+      y -= s;
+      dep = ((x>>8)&255) + (y&(255<<8));
+      put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
+    }
+  }
+  teta = (teta+1) % 360;
+}
+
+void init_demo() {
+  int i,j;
+  double h;
+  double radian;
+  char line[3 * 128];
+
+  FILE *fichier;
+
+
+  fichier = fopen("rotozoom-ffmpeg.pnm","r");
+  fread(line, 1, 15, fichier);
+  for (i=0;i<128;i++) {
+    fread(line,1,3*128,fichier);
+    for (j=0;j<128;j++) {
+	  tab_r[256*i+j] = line[3*j    ];
+	  tab_g[256*i+j] = line[3*j + 1];
+	  tab_b[256*i+j] = line[3*j + 2];
+    }
+	memcpy(tab_r + 257*128 + i*256, tab_r + i*256, 128);
+	memcpy(tab_g + 257*128 + i*256, tab_g + i*256, 128);
+	memcpy(tab_b + 257*128 + i*256, tab_b + i*256, 128);
+  }
+  fclose(fichier);
+
+  fichier = fopen("rotozoom-tux.pnm","r");
+  fread(line, 1, 15, fichier);
+  for (i=0;i<128;i++) {
+    fread(line,1,3*128,fichier);
+    for (j=0;j<128;j++) {
+	  tab_r[128 + 256*i+j] = line[3*j    ];
+	  tab_g[128 + 256*i+j] = line[3*j + 1];
+	  tab_b[128 + 256*i+j] = line[3*j + 2];
+    }
+	memcpy(tab_r + 256*128 + i*256, tab_r + 128 + i*256, 128);
+	memcpy(tab_g + 256*128 + i*256, tab_g + 128 + i*256, 128);
+	memcpy(tab_b + 256*128 + i*256, tab_b + 128 + i*256, 128);
+  }
+  fclose(fichier);
+
+
+
+  /* tables sin/cos */
+  for (i=0;i<360;i++) {
+    radian = 2*i*M_PI/360;
+    h = 2 + cos (radian);      
+    h_cos[i] = 256 * ( h * cos (radian) );
+    h_sin[i] = 256 * ( h * sin (radian) );
+  }
+}
+
+int main(int argc, char **argv)
+{
+    int w, h, i;
+    char buf[1024];
+
+    if (argc != 2) {
+        printf("usage: %s directory/\n"
+               "generate a test video stream\n", argv[0]);
+        exit(1);
+    }
+
+    w = DEFAULT_WIDTH;
+    h = DEFAULT_HEIGHT;
+
+    rgb_tab = malloc(w * h * 3);
+    wrap = w * 3;
+    width = w;
+    height = h;
+
+    init_demo();
+
+    for(i=0;i<DEFAULT_NB_PICT;i++) {
+        snprintf(buf, sizeof(buf), "%s%03d.pgm", argv[1], i);
+        gen_image(i, w, h);
+        pgmyuv_save(buf, w, h, rgb_tab);
+    }
+    
+    free(rgb_tab);
+    return 0;
+}