File: rotozoom.c

package info (click to toggle)
ffmpeg 7:3.2.5-1~bpo8+1
  • links: PTS, VCS
  • area: main
  • in suites: jessie-backports
  • size: 72,224 kB
  • sloc: ansic: 927,948; asm: 77,498; sh: 7,731; makefile: 3,652; cpp: 1,504; objc: 1,069; perl: 986; python: 49
file content (195 lines) | stat: -rw-r--r-- 4,837 bytes parent folder | download | duplicates (13)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * Generate a synthetic YUV video sequence suitable for codec testing.
 *
 * 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
 */

#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>

#include "utils.c"

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

static int64_t int_pow(int64_t a, int p)
{
    int64_t v = FIXP;

    for (; p; p--) {
        v *= a;
        v /= FIXP;
    }

    return v;
}

static int64_t int_sin(int64_t a)
{
    if (a < 0)
        a = MY_PI - a;  // 0..inf
    a %= 2 * MY_PI;     // 0..2PI

    if (a >= MY_PI * 3 / 2)
        a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2
    if (a >= MY_PI / 2)
        a = MY_PI - a;  // -PI / 2 ..  PI / 2

    return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;
}

static unsigned char tab_r[256 * 256];
static unsigned char tab_g[256 * 256];
static unsigned char tab_b[256 * 256];

static int h_cos[360];
static int h_sin[360];

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;
}

static void gen_image(int num, int w, int h)
{
    const int c = h_cos[num % 360];
    const int s = h_sin[num % 360];

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

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

    int x, y;
    int xprime = xj;
    int yprime = yj;

    for (j = 0; j < h; j++) {
        x       = xprime + xi + FIXP * w / 2;
        xprime += s;

        y       = yprime + yi + FIXP * h / 2;
        yprime += c;

        for (i = 0; i < w; i++) {
            x += c;
            y -= s;
            put_pixel(i, j,
                      ipol(tab_r, x, y),
                      ipol(tab_g, x, y),
                      ipol(tab_b, x, y));
        }
    }
}

#define W 256
#define H 256

static int init_demo(const char *filename)
{
    int i, j;
    int h;
    int radian;
    char line[3 * W];

    FILE *input_file;

    input_file = fopen(filename, "rb");
    if (!input_file) {
        perror(filename);
        return 1;
    }

    if (fread(line, 1, 15, input_file) != 15)
        return 1;
    for (i = 0; i < H; i++) {
        if (fread(line, 1, 3 * W, input_file) != 3 * W)
            return 1;
        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];
        }
    }
    fclose(input_file);

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

    return 0;
}

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

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

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

    w = DEFAULT_WIDTH;
    h = DEFAULT_HEIGHT;

    rgb_tab = malloc(w * h * 3);
    wrap    = w * 3;
    width   = w;
    height  = h;

    if (init_demo(argv[1]))
        return 1;

    for (i = 0; i < DEFAULT_NB_PICT; i++) {
        gen_image(i, w, h);
        if (isdir) {
            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);
        }
    }

    free(rgb_tab);
    return 0;
}