rotozoom.c 4.72 KB
Newer Older
1
/*
2
 * Generate a synthetic YUV video sequence suitable for codec testing.
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 *
 * copyright (c) Sebastien Bechet <s.bechet@av7.net>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

23 24
#include <stdlib.h>
#include <stdio.h>
25 26
#include <inttypes.h>

27 28
#include "utils.c"

29
#define FIXP (1 << 16)
30
#define MY_PI 205887 // (M_PI * FIX)
31

32 33 34
static int64_t int_pow(int64_t a, int p)
{
    int64_t v = FIXP;
35

36 37 38
    for (; p; p--) {
        v *= a;
        v /= FIXP;
39 40 41 42 43
    }

    return v;
}

44 45 46 47 48
static int64_t int_sin(int64_t a)
{
    if (a < 0)
        a = MY_PI - a;  // 0..inf
    a %= 2 * MY_PI;     // 0..2PI
49

50 51
    if (a >= MY_PI * 3 / 2)
        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 59 60
static unsigned char tab_r[256 * 256];
static unsigned char tab_g[256 * 256];
static unsigned char tab_b[256 * 256];
61

62 63
static int h_cos[360];
static int h_sin[360];
64

65 66 67 68 69 70 71 72 73 74 75 76 77 78
static int ipol(uint8_t *src, int x, int y)
{
    int int_x  = x >> 16;
    int int_y  = y >> 16;
    int frac_x = x & 0xFFFF;
    int frac_y = y & 0xFFFF;
    int s00    = src[( int_x      & 255) + 256 * ( int_y      & 255)];
    int s01    = src[((int_x + 1) & 255) + 256 * ( int_y      & 255)];
    int s10    = src[( int_x      & 255) + 256 * ((int_y + 1) & 255)];
    int s11    = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];
    int s0     = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;
    int s1     = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;

    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 84
    const int c = h_cos[num % 360];
    const int s = h_sin[num % 360];
85

86 87
    const int xi = -(w / 2) * c;
    const int yi =  (w / 2) * s;
88

89 90 91
    const int xj = -(h / 2) * s;
    const int yj = -(h / 2) * c;
    int i, j;
92

93 94 95
    int x, y;
    int xprime = xj;
    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++) {
105 106
            x += c;
            y -= s;
107 108 109 110
            put_pixel(i, j,
                      ipol(tab_r, x, y),
                      ipol(tab_g, x, y),
                      ipol(tab_b, x, y));
111
        }
112 113 114
    }
}

115 116 117
#define W 256
#define H 256

118
static int init_demo(const char *filename)
119 120 121 122 123 124
{
    int i, j;
    int h;
    int radian;
    char line[3 * W];

125
    FILE *input_file;
126

127 128
    input_file = fopen(filename, "rb");
    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;
138 139 140 141 142 143
        for (j = 0; j < W; j++) {
            tab_r[W * i + j] = line[3 * j    ];
            tab_g[W * i + j] = line[3 * j + 1];
            tab_b[W * i + j] = line[3 * j + 2];
        }
    }
144
    fclose(input_file);
145 146 147

    /* tables sin/cos */
    for (i = 0; i < 360; i++) {
148 149
        radian   = 2 * i * MY_PI / 360;
        h        = 2 * FIXP + int_sin(radian);
150 151
        h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;
        h_sin[i] = h * int_sin(radian)             / 2 / FIXP;
152
    }
153

154
    return 0;
155 156 157 158 159 160
}

int main(int argc, char **argv)
{
    int w, h, i;
    char buf[1024];
161
    int isdir = 0;
162

163 164
    if (argc != 3) {
        printf("usage: %s image.pnm file|dir\n"
165
               "generate a test video stream\n", argv[0]);
166
        return 1;
167 168
    }

169 170
    if (!freopen(argv[2], "wb", stdout))
        isdir = 1;
171

172 173 174 175
    w = DEFAULT_WIDTH;
    h = DEFAULT_HEIGHT;

    rgb_tab = malloc(w * h * 3);
176 177 178
    wrap    = w * 3;
    width   = w;
    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) {
186 187 188 189 190
            snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[2], i);
            pgmyuv_save(buf, w, h, rgb_tab);
        } else {
            pgmyuv_save(NULL, w, h, rgb_tab);
        }
191
    }
192

193 194 195
    free(rgb_tab);
    return 0;
}