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/*
* 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 <stdio.h>
#include <stdlib.h>
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/lfg.h"
#include "libavutil/random_seed.h"
typedef struct CBState {
unsigned int read_idx;
unsigned int write_idx;
unsigned int to_process;
unsigned int offset;
} CBState;
static int read_cb(void *opaque, void *buf, size_t *nb_elems)
{
CBState *s = opaque;
unsigned *b = buf;
*nb_elems = FFMIN(*nb_elems, s->to_process);
for (unsigned i = 0; i < *nb_elems; i++)
if (b[i] != s->read_idx + s->offset + i) {
printf("Mismatch at idx %u offset %u i %u\n",
s->read_idx, s->offset, i);
return AVERROR_BUG;
}
s->offset += *nb_elems;
s->to_process -= *nb_elems;
return 0;
}
static int write_cb(void *opaque, void *buf, size_t *nb_elems)
{
CBState *s = opaque;
unsigned *b = buf;
*nb_elems = FFMIN(*nb_elems, s->to_process);
for (unsigned i = 0; i < *nb_elems; i++)
b[i] = s->write_idx + i;
s->write_idx += *nb_elems;
s->to_process -= *nb_elems;
return 0;
}
int main(void)
{
/* create a FIFO buffer */
AVFifo *fifo = av_fifo_alloc2(13, sizeof(int), 0);
int i, j, n, *p;
/* fill data */
for (i = 0; av_fifo_can_write(fifo); i++)
av_fifo_write(fifo, &i, 1);
/* peek_at at FIFO */
n = av_fifo_can_read(fifo);
for (i = 0; i < n; i++) {
av_fifo_peek(fifo, &j, 1, i);
printf("%d: %d\n", i, j);
}
printf("\n");
/* generic peek at FIFO */
n = av_fifo_can_read(fifo);
p = malloc(n * av_fifo_elem_size(fifo));
if (p == NULL) {
fprintf(stderr, "failed to allocate memory.\n");
exit(1);
}
(void) av_fifo_peek(fifo, p, n, 0);
/* read data at p */
for(i = 0; i < n; ++i)
printf("%d: %d\n", i, p[i]);
putchar('\n');
/* read data */
for (i = 0; av_fifo_can_read(fifo); i++) {
av_fifo_read(fifo, &j, 1);
printf("%d ", j);
}
printf("\n");
/* fill data */
for (i = 0; av_fifo_can_write(fifo); i++)
av_fifo_write(fifo, &i, 1);
/* peek_at at FIFO */
n = av_fifo_can_read(fifo);
for (i = 0; i < n; i++) {
av_fifo_peek(fifo, &j, 1, i);
printf("%d: %d\n", i, j);
}
putchar('\n');
/* test fifo_grow */
(void) av_fifo_grow2(fifo, 15);
/* fill data */
n = av_fifo_can_read(fifo);
for (i = n; av_fifo_can_write(fifo); ++i)
av_fifo_write(fifo, &i, 1);
/* peek_at at FIFO */
n = av_fifo_can_read(fifo);
for (i = 0; i < n; i++) {
av_fifo_peek(fifo, &j, 1, i);
printf("%d: %d\n", i, j);
}
av_fifo_freep2(&fifo);
/* test randomly-sized write/read/peek with a callback */
{
CBState s = { 0 };
uint32_t seed = av_get_random_seed();
AVLFG lfg;
int ret;
av_lfg_init(&lfg, seed);
fifo = av_fifo_alloc2(1, sizeof(unsigned), AV_FIFO_FLAG_AUTO_GROW);
for (i = 0; i < 32; i++) {
size_t nb_elems = 16;
unsigned to_process = av_lfg_get(&lfg) % nb_elems;
s.to_process = to_process;
ret = av_fifo_write_from_cb(fifo, write_cb, &s, &nb_elems);
if (ret < 0 || s.to_process || nb_elems != to_process) {
printf("FIFO write fail; seed %"PRIu32"\n", seed);
return 1;
}
nb_elems = av_fifo_can_read(fifo);
if (nb_elems > 1) {
s.offset = av_lfg_get(&lfg) % (nb_elems - 1);
nb_elems -= s.offset;
s.to_process = av_lfg_get(&lfg) % nb_elems;
to_process = s.to_process;
ret = av_fifo_peek_to_cb(fifo, read_cb, &s, &nb_elems, s.offset);
if (ret < 0 || s.to_process || nb_elems != to_process) {
printf("FIFO peek fail; seed %"PRIu32"\n", seed);
return 1;
}
}
nb_elems = av_fifo_can_read(fifo);
to_process = nb_elems ? av_lfg_get(&lfg) % nb_elems : 0;
s.to_process = to_process;
s.offset = 0;
ret = av_fifo_read_to_cb(fifo, read_cb, &s, &nb_elems);
if (ret < 0 || s.to_process || to_process != nb_elems) {
printf("FIFO read fail; seed %"PRIu32"\n", seed);
return 1;
}
s.read_idx += s.offset;
}
}
av_fifo_freep2(&fifo);
free(p);
return 0;
}
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