1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include "libavutil/fifo.h"
22
main(void)23 int main(void)
24 {
25 /* create a FIFO buffer */
26 AVFifoBuffer *fifo = av_fifo_alloc(13 * sizeof(int));
27 int i, j, n, *p;
28
29 /* fill data */
30 for (i = 0; av_fifo_space(fifo) >= sizeof(int); i++)
31 av_fifo_generic_write(fifo, &i, sizeof(int), NULL);
32
33 /* peek at FIFO */
34 n = av_fifo_size(fifo) / sizeof(int);
35 for (i = -n + 1; i < n; i++) {
36 int *v = (int *)av_fifo_peek2(fifo, i * sizeof(int));
37 printf("%d: %d\n", i, *v);
38 }
39 printf("\n");
40
41 /* peek_at at FIFO */
42 n = av_fifo_size(fifo) / sizeof(int);
43 for (i = 0; i < n; i++) {
44 av_fifo_generic_peek_at(fifo, &j, i * sizeof(int), sizeof(j), NULL);
45 printf("%d: %d\n", i, j);
46 }
47 printf("\n");
48
49 /* generic peek at FIFO */
50
51 n = av_fifo_size(fifo);
52 p = malloc(n);
53 if (p == NULL) {
54 fprintf(stderr, "failed to allocate memory.\n");
55 exit(1);
56 }
57
58 (void) av_fifo_generic_peek(fifo, p, n, NULL);
59
60 /* read data at p */
61 n /= sizeof(int);
62 for(i = 0; i < n; ++i)
63 printf("%d: %d\n", i, p[i]);
64
65 putchar('\n');
66
67 /* read data */
68 for (i = 0; av_fifo_size(fifo) >= sizeof(int); i++) {
69 av_fifo_generic_read(fifo, &j, sizeof(int), NULL);
70 printf("%d ", j);
71 }
72 printf("\n");
73
74 /* test *ndx overflow */
75 av_fifo_reset(fifo);
76 fifo->rndx = fifo->wndx = ~(uint32_t)0 - 5;
77
78 /* fill data */
79 for (i = 0; av_fifo_space(fifo) >= sizeof(int); i++)
80 av_fifo_generic_write(fifo, &i, sizeof(int), NULL);
81
82 /* peek_at at FIFO */
83 n = av_fifo_size(fifo) / sizeof(int);
84 for (i = 0; i < n; i++) {
85 av_fifo_generic_peek_at(fifo, &j, i * sizeof(int), sizeof(j), NULL);
86 printf("%d: %d\n", i, j);
87 }
88 putchar('\n');
89
90 /* test fifo_grow */
91 (void) av_fifo_grow(fifo, 15 * sizeof(int));
92
93 /* fill data */
94 n = av_fifo_size(fifo) / sizeof(int);
95 for (i = n; av_fifo_space(fifo) >= sizeof(int); ++i)
96 av_fifo_generic_write(fifo, &i, sizeof(int), NULL);
97
98 /* peek_at at FIFO */
99 n = av_fifo_size(fifo) / sizeof(int);
100 for (i = 0; i < n; i++) {
101 av_fifo_generic_peek_at(fifo, &j, i * sizeof(int), sizeof(j), NULL);
102 printf("%d: %d\n", i, j);
103 }
104
105 av_fifo_free(fifo);
106 free(p);
107
108 return 0;
109 }
110