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/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Two Orioles, LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "input/demuxer.h"
typedef struct DemuxerPriv {
FILE *f;
} IvfInputContext;
static const uint8_t probe_data[] = {
'D', 'K', 'I', 'F',
0, 0, 0x20, 0,
'A', 'V', '0', '1',
};
static int ivf_probe(const uint8_t *const data) {
return !memcmp(data, probe_data, sizeof(probe_data));
}
static unsigned rl32(const uint8_t *const p) {
return ((uint32_t)p[3] << 24U) | (p[2] << 16U) | (p[1] << 8U) | p[0];
}
static int64_t rl64(const uint8_t *const p) {
return (((uint64_t) rl32(&p[4])) << 32) | rl32(p);
}
static int ivf_open(IvfInputContext *const c, const char *const file,
unsigned fps[2], unsigned *const num_frames, unsigned timebase[2])
{
size_t res;
uint8_t hdr[32];
if (!(c->f = fopen(file, "rb"))) {
fprintf(stderr, "Failed to open %s: %s\n", file, strerror(errno));
return -1;
} else if ((res = fread(hdr, 32, 1, c->f)) != 1) {
fprintf(stderr, "Failed to read stream header: %s\n", strerror(errno));
fclose(c->f);
return -1;
} else if (memcmp(hdr, "DKIF", 4)) {
fprintf(stderr, "%s is not an IVF file [tag=%.4s|0x%02x%02x%02x%02x]\n",
file, hdr, hdr[0], hdr[1], hdr[2], hdr[3]);
fclose(c->f);
return -1;
} else if (memcmp(&hdr[8], "AV01", 4)) {
fprintf(stderr, "%s is not an AV1 file [tag=%.4s|0x%02x%02x%02x%02x]\n",
file, &hdr[8], hdr[8], hdr[9], hdr[10], hdr[11]);
fclose(c->f);
return -1;
}
timebase[0] = rl32(&hdr[16]);
timebase[1] = rl32(&hdr[20]);
const unsigned duration = rl32(&hdr[24]);
uint8_t data[4];
for (*num_frames = 0;; (*num_frames)++) {
if ((res = fread(data, 4, 1, c->f)) != 1)
break; // EOF
fseeko(c->f, rl32(data) + 8, SEEK_CUR);
}
uint64_t fps_num = (uint64_t) timebase[0] * *num_frames;
uint64_t fps_den = (uint64_t) timebase[1] * duration;
if (fps_num && fps_den) { /* Reduce fraction */
uint64_t gcd = fps_num;
for (uint64_t a = fps_den, b; (b = a % gcd); a = gcd, gcd = b);
fps_num /= gcd;
fps_den /= gcd;
while ((fps_num | fps_den) > UINT_MAX) {
fps_num >>= 1;
fps_den >>= 1;
}
}
if (fps_num && fps_den) {
fps[0] = (unsigned) fps_num;
fps[1] = (unsigned) fps_den;
} else {
fps[0] = fps[1] = 0;
}
fseeko(c->f, 32, SEEK_SET);
return 0;
}
static int ivf_read(IvfInputContext *const c, Dav1dData *const buf) {
uint8_t data[8];
uint8_t *ptr;
size_t res;
const int64_t off = ftello(c->f);
if ((res = fread(data, 4, 1, c->f)) != 1)
return -1; // EOF
const ptrdiff_t sz = rl32(data);
if ((res = fread(data, 8, 1, c->f)) != 1)
return -1; // EOF
ptr = dav1d_data_create(buf, sz);
if (!ptr) return -1;
buf->m.offset = off;
buf->m.timestamp = rl64(data);
if ((res = fread(ptr, sz, 1, c->f)) != 1) {
fprintf(stderr, "Failed to read frame data: %s\n", strerror(errno));
dav1d_data_unref(buf);
return -1;
}
return 0;
}
static void ivf_close(IvfInputContext *const c) {
fclose(c->f);
}
const Demuxer ivf_demuxer = {
.priv_data_size = sizeof(IvfInputContext),
.name = "ivf",
.probe = ivf_probe,
.probe_sz = sizeof(probe_data),
.open = ivf_open,
.read = ivf_read,
.close = ivf_close,
};
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