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
|
/*
* Copyright © 2019, VideoLAN and dav1d authors
* Copyright © 2019, Two Orioles, LLC
* Copyright © 2019, James Almer <jamrial@gmail.com>
* 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,
.seek = NULL,
.close = section5_close,
};
|
