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rotozoom.c
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1 /*
2  * Generate a synthetic YUV video sequence suitable for codec testing.
3  *
4  * copyright (c) Sebastien Bechet <s.bechet@av7.net>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <inttypes.h>
26 
27 #include "utils.c"
28 
29 #define FIXP (1 << 16)
30 #define MY_PI 205887 // (M_PI * FIX)
31 
32 static int64_t int_pow(int64_t a, int p)
33 {
34  int64_t v = FIXP;
35 
36  for (; p; p--) {
37  v *= a;
38  v /= FIXP;
39  }
40 
41  return v;
42 }
43 
44 static int64_t int_sin(int64_t a)
45 {
46  if (a < 0)
47  a = MY_PI - a; // 0..inf
48  a %= 2 * MY_PI; // 0..2PI
49 
50  if (a >= MY_PI * 3 / 2)
51  a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
52  if (a >= MY_PI / 2)
53  a = MY_PI - a; // -PI / 2 .. PI / 2
54 
55  return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;
56 }
57 
58 static unsigned char tab_r[256 * 256];
59 static unsigned char tab_g[256 * 256];
60 static unsigned char tab_b[256 * 256];
61 
62 static int h_cos[360];
63 static int h_sin[360];
64 
65 static int ipol(uint8_t *src, int x, int y)
66 {
67  int int_x = x >> 16;
68  int int_y = y >> 16;
69  int frac_x = x & 0xFFFF;
70  int frac_y = y & 0xFFFF;
71  int s00 = src[( int_x & 255) + 256 * ( int_y & 255)];
72  int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)];
73  int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)];
74  int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];
75  int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;
76  int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;
77 
78  return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24;
79 }
80 
81 static void gen_image(int num, int w, int h)
82 {
83  const int c = h_cos[num % 360];
84  const int s = h_sin[num % 360];
85 
86  const int xi = -(w / 2) * c;
87  const int yi = (w / 2) * s;
88 
89  const int xj = -(h / 2) * s;
90  const int yj = -(h / 2) * c;
91  int i, j;
92 
93  int x, y;
94  int xprime = xj;
95  int yprime = yj;
96 
97  for (j = 0; j < h; j++) {
98  x = xprime + xi + FIXP * w / 2;
99  xprime += s;
100 
101  y = yprime + yi + FIXP * h / 2;
102  yprime += c;
103 
104  for (i = 0; i < w; i++) {
105  x += c;
106  y -= s;
107  put_pixel(i, j,
108  ipol(tab_r, x, y),
109  ipol(tab_g, x, y),
110  ipol(tab_b, x, y));
111  }
112  }
113 }
114 
115 #define W 256
116 #define H 256
117 
118 static int init_demo(const char *filename)
119 {
120  int i, j;
121  int h;
122  int radian;
123  char line[3 * W];
124 
125  FILE *input_file;
126 
127  input_file = fopen(filename, "rb");
128  if (!input_file) {
129  perror(filename);
130  return 1;
131  }
132 
133  if (fread(line, 1, 15, input_file) != 15)
134  return 1;
135  for (i = 0; i < H; i++) {
136  if (fread(line, 1, 3 * W, input_file) != 3 * W)
137  return 1;
138  for (j = 0; j < W; j++) {
139  tab_r[W * i + j] = line[3 * j ];
140  tab_g[W * i + j] = line[3 * j + 1];
141  tab_b[W * i + j] = line[3 * j + 2];
142  }
143  }
144  fclose(input_file);
145 
146  /* tables sin/cos */
147  for (i = 0; i < 360; i++) {
148  radian = 2 * i * MY_PI / 360;
149  h = 2 * FIXP + int_sin(radian);
150  h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
151  h_sin[i] = h * int_sin(radian) / 2 / FIXP;
152  }
153 
154  return 0;
155 }
156 
157 int main(int argc, char **argv)
158 {
159  int w, h, i;
160  char buf[1024];
161  int isdir = 0;
162 
163  if (argc != 3) {
164  printf("usage: %s image.pnm file|dir\n"
165  "generate a test video stream\n", argv[0]);
166  return 1;
167  }
168 
169  if (!freopen(argv[2], "wb", stdout))
170  isdir = 1;
171 
172  w = DEFAULT_WIDTH;
173  h = DEFAULT_HEIGHT;
174 
175  rgb_tab = malloc(w * h * 3);
176  wrap = w * 3;
177  width = w;
178  height = h;
179 
180  if (init_demo(argv[1]))
181  return 1;
182 
183  for (i = 0; i < DEFAULT_NB_PICT; i++) {
184  gen_image(i, w, h);
185  if (isdir) {
186  snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[2], i);
187  pgmyuv_save(buf, w, h, rgb_tab);
188  } else {
189  pgmyuv_save(NULL, w, h, rgb_tab);
190  }
191  }
192 
193  free(rgb_tab);
194  return 0;
195 }
#define NULL
Definition: coverity.c:32
static unsigned char tab_g[256 *256]
Definition: rotozoom.c:59
const char * s
Definition: avisynth_c.h:631
#define MY_PI
Definition: rotozoom.c:30
#define FIXP
Definition: rotozoom.c:29
static int64_t int_pow(int64_t a, int p)
Definition: rotozoom.c:32
static void pgmyuv_save(const char *filename, int w, int h, const unsigned char *rgb_tab)
Definition: utils.c:106
static void put_pixel(int x, int y, int r, int g, int b)
Definition: utils.c:160
static unsigned char tab_b[256 *256]
Definition: rotozoom.c:60
#define H
Definition: rotozoom.c:116
static int64_t int_sin(int64_t a)
Definition: rotozoom.c:44
static int h_sin[360]
Definition: rotozoom.c:63
static unsigned char * rgb_tab
Definition: utils.c:157
uint8_t
#define DEFAULT_NB_PICT
Definition: utils.c:104
#define DEFAULT_WIDTH
Definition: utils.c:102
#define s0
Definition: regdef.h:37
#define wrap(func)
Definition: neontest.h:65
Definition: graph2dot.c:48
static unsigned char tab_r[256 *256]
Definition: rotozoom.c:58
#define width
uint32_t i
Definition: intfloat.h:28
#define src
Definition: vp9dsp.c:530
#define W
Definition: rotozoom.c:115
int main(int argc, char **argv)
Definition: rotozoom.c:157
void * buf
Definition: avisynth_c.h:553
#define DEFAULT_HEIGHT
Definition: utils.c:103
#define s1
Definition: regdef.h:38
#define snprintf
Definition: snprintf.h:34
static int h_cos[360]
Definition: rotozoom.c:62
static double c[64]
static void gen_image(int num, int w, int h)
Definition: rotozoom.c:81
static int init_demo(const char *filename)
Definition: rotozoom.c:118
static int ipol(uint8_t *src, int x, int y)
Definition: rotozoom.c:65
#define height