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
32static 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
44static 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
58static unsigned char tab_r[256 * 256];
59static unsigned char tab_g[256 * 256];
60static unsigned char tab_b[256 * 256];
61
62static int h_cos[360];
63static int h_sin[360];
64
65static 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
81static 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
118static 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
157int 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}
196