ref: c48ea15febf8f6a3a34e998f04c36861f0fc4aed
dir: /tools/input/section5.c/
/*
* Copyright © 2019, VideoLAN and dav1d authors
* Copyright © 2019, Two Orioles, LLC
* Copyright © 2019, James Almer <[email protected]>
* 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 <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "dav1d/headers.h"
#include "input/demuxer.h"
#include "input/parse.h"
#define PROBE_SIZE 1024
static int section5_probe(const uint8_t *data) {
int ret, cnt = 0;
// Check that the first OBU is a Temporal Delimiter.
size_t obu_size;
enum Dav1dObuType type;
ret = parse_obu_header(data + cnt, PROBE_SIZE - cnt,
&obu_size, &type, 0);
if (ret < 0 || type != DAV1D_OBU_TD || obu_size > 0)
return 0;
cnt += ret;
// look for first frame and accompanying sequence header
int seq = 0;
while (cnt < PROBE_SIZE) {
ret = parse_obu_header(data + cnt, PROBE_SIZE - cnt,
&obu_size, &type, 0);
if (ret < 0)
return 0;
cnt += ret;
switch (type) {
case DAV1D_OBU_SEQ_HDR:
seq = 1;
break;
case DAV1D_OBU_FRAME:
case DAV1D_OBU_FRAME_HDR:
return seq;
case DAV1D_OBU_TD:
case DAV1D_OBU_TILE_GRP:
return 0;
default:
break;
}
}
return 0;
}
typedef struct DemuxerPriv {
FILE *f;
} Section5InputContext;
static int section5_open(Section5InputContext *const c, const char *const file,
unsigned fps[2], unsigned *const num_frames, unsigned timebase[2])
{
if (!(c->f = fopen(file, "rb"))) {
fprintf(stderr, "Failed to open %s: %s\n", file, strerror(errno));
return -1;
}
// TODO: Parse sequence header and read timing info if any.
fps[0] = 25;
fps[1] = 1;
timebase[0] = 25;
timebase[1] = 1;
*num_frames = 0;
for (;;) {
uint8_t byte[2];
if (fread(&byte[0], 1, 1, c->f) < 1)
break;
const enum Dav1dObuType obu_type = (byte[0] >> 3) & 0xf;
if (obu_type == DAV1D_OBU_TD)
(*num_frames)++;
const int has_length_field = byte[0] & 0x2;
if (!has_length_field)
return -1;
const int has_extension = byte[0] & 0x4;
if (has_extension && fread(&byte[1], 1, 1, c->f) < 1)
return -1;
size_t len;
const int res = leb128(c->f, &len);
if (res < 0)
return -1;
fseeko(c->f, len, SEEK_CUR); // skip packet
}
fseeko(c->f, 0, SEEK_SET);
return 0;
}
static int section5_read(Section5InputContext *const c, Dav1dData *const data) {
size_t total_bytes = 0;
for (int first = 1;; first = 0) {
uint8_t byte[2];
if (fread(&byte[0], 1, 1, c->f) < 1) {
if (!first && feof(c->f)) break;
return -1;
}
const enum Dav1dObuType obu_type = (byte[0] >> 3) & 0xf;
if (first) {
if (obu_type != DAV1D_OBU_TD)
return -1;
} else {
if (obu_type == DAV1D_OBU_TD) {
// include TD in next packet
fseeko(c->f, -1, SEEK_CUR);
break;
}
}
const int has_length_field = byte[0] & 0x2;
if (!has_length_field)
return -1;
const int has_extension = !!(byte[0] & 0x4);
if (has_extension && fread(&byte[1], 1, 1, c->f) < 1)
return -1;
size_t len;
const int res = leb128(c->f, &len);
if (res < 0)
return -1;
total_bytes += 1 + has_extension + res + len;
fseeko(c->f, len, SEEK_CUR); // skip packet, we'll read it below
}
fseeko(c->f, -(off_t)total_bytes, SEEK_CUR);
uint8_t *ptr = dav1d_data_create(data, total_bytes);
if (!ptr) return -1;
if (fread(ptr, total_bytes, 1, c->f) != 1) {
fprintf(stderr, "Failed to read frame data: %s\n", strerror(errno));
dav1d_data_unref(data);
return -1;
}
return 0;
}
static void section5_close(Section5InputContext *const c) {
fclose(c->f);
}
const Demuxer section5_demuxer = {
.priv_data_size = sizeof(Section5InputContext),
.name = "section5",
.probe = section5_probe,
.probe_sz = PROBE_SIZE,
.open = section5_open,
.read = section5_read,
.close = section5_close,
};