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
|
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "dirac_parse.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define READ_SIZE 4096
unsigned char data[READ_SIZE];
int parse_packet (FILE *file, unsigned char **p_data, int *p_size);
int
main (int argc, char *argv[])
{
FILE *file;
int ret;
DiracSequenceHeader header = {0};
int size;
unsigned char *packet;
int n;
int i;
if (argc < 2) {
fprintf(stderr, "parse_header infile.drc\n");
return 1;
}
file = fopen (argv[1], "r");
if (file == NULL) {
printf("cannot open %s for reading: %s\n", argv[1], strerror(errno));
return 1;
}
n = fread (data, 1, 4096, file);
if (n < 13) {
printf("file too short\n");
exit(1);
}
for(i=0;i<=n - 13;i++){
packet = data + i;
if (packet[0] == 'B' && packet[1] == 'B' && packet[2] == 'C' &&
packet[3] == 'D') {
size = (packet[5]<<24) | (packet[6]<<16) | (packet[7]<<8) | (packet[8]);
if (size == 0) {
size = 13;
}
if (i + size > n) {
continue;
}
if (SCHRO_PARSE_CODE_IS_SEQ_HEADER(packet[4])) {
ret = dirac_sequence_header_parse (&header, packet + 13, size - 13);
if (!ret) {
printf("bad header\n");
exit(1);
}
#define PRINT(ack) printf( #ack ": %d\n", header. ack );
PRINT(major_version);
PRINT(minor_version);
PRINT(profile);
PRINT(level);
PRINT(index);
PRINT(width);
PRINT(height);
PRINT(chroma_format);
PRINT(interlaced);
PRINT(top_field_first);
PRINT(frame_rate_numerator);
PRINT(frame_rate_denominator);
PRINT(aspect_ratio_numerator);
PRINT(aspect_ratio_denominator);
PRINT(clean_width);
PRINT(clean_height);
PRINT(left_offset);
PRINT(top_offset);
PRINT(luma_offset);
PRINT(luma_excursion);
PRINT(chroma_offset);
PRINT(chroma_excursion);
PRINT(colour_primaries);
PRINT(colour_matrix);
PRINT(transfer_function);
PRINT(interlaced_coding);
return 0;
}
}
}
return 0;
}
int
parse_packet (FILE *file, unsigned char **p_data, int *p_size)
{
unsigned char *packet;
unsigned char header[13];
int n;
int size;
n = fread (header, 1, 13, file);
if (n == 0) {
*p_data = NULL;
*p_size = 0;
return 1;
}
if (n < 13) {
printf("truncated header\n");
return 0;
}
if (header[0] != 'B' || header[1] != 'B' || header[2] != 'C' ||
header[3] != 'D') {
return 0;
}
size = (header[5]<<24) | (header[6]<<16) | (header[7]<<8) | (header[8]);
if (size == 0) {
size = 13;
}
if (size < 13) {
return 0;
}
if (size > 16*1024*1024) {
printf("packet too large? (%d > 16777216)\n", size);
return 0;
}
packet = malloc (size);
memcpy (packet, header, 13);
n = fread (packet + 13, 1, size - 13, file);
if (n < size - 13) {
free (packet);
return 0;
}
*p_data = packet;
*p_size = size;
return 1;
}
|
