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
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* EIT descriptor generator
* Copyright (C) 2010-2011 Unix Solutions Ltd.
*
* Released under MIT license.
* See LICENSE-MIT.txt for license terms.
*/
#include <stdio.h>
#include <unistd.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include "tsfuncs.h"
static void ts_eit_regenerate_packet_data(struct ts_eit *eit) {
uint8_t *ts_packets;
int num_packets;
ts_eit_generate(eit, &ts_packets, &num_packets);
memcpy(eit->section_header->packet_data, ts_packets, num_packets * TS_PACKET_SIZE);
eit->section_header->num_packets = num_packets;
free(ts_packets);
}
struct ts_eit *ts_eit_init(struct ts_eit *eit, uint16_t service_id, uint16_t transport_stream_id, uint16_t org_network_id, uint8_t table_id, uint8_t sec_number, uint8_t last_sec_number) {
eit->ts_header.pid = 0x12;
eit->ts_header.pusi = 1;
eit->ts_header.payload_field = 1;
eit->ts_header.payload_offset = 4;
eit->section_header->table_id = table_id;
eit->section_header->version_number = 1;
eit->section_header->current_next_indicator = 1;
eit->section_header->section_syntax_indicator = 1;
eit->section_header->private_indicator = 1;
eit->section_header->section_length = 9 + 6; // Empty section, +6 (16+16+8+8 bits) for EIT table data
eit->section_header->ts_id_number = service_id;
eit->section_header->reserved1 = 3;
eit->section_header->reserved2 = 3;
eit->section_header->section_number = sec_number;
eit->section_header->last_section_number = last_sec_number;
eit->transport_stream_id = transport_stream_id; // 16 bits
eit->original_network_id = org_network_id; // 16 bits
eit->segment_last_section_number = 0; // 8 bits
eit->last_table_id = table_id; // 8 bits
eit->streams_num = 0;
eit->initialized = 1;
ts_eit_regenerate_packet_data(eit);
return eit;
}
struct ts_eit *ts_eit_alloc_init(uint16_t service_id, uint16_t transport_stream_id, uint16_t org_network_id, uint8_t table_id, uint8_t sec_number, uint8_t last_sec_number) {
struct ts_eit *eit = ts_eit_alloc();
if (!eit)
return NULL;
return ts_eit_init(eit, service_id, transport_stream_id, org_network_id, table_id, sec_number, last_sec_number);
}
struct ts_eit *ts_eit_alloc_init_pf(uint16_t service_id, uint16_t transport_stream_id, uint16_t org_network_id, uint8_t sec_number, uint8_t last_sec_number) {
return ts_eit_alloc_init(service_id, transport_stream_id, org_network_id, 0x4e, sec_number, last_sec_number);
}
struct ts_eit *ts_eit_alloc_init_schedule(uint16_t service_id, uint16_t transport_stream_id, uint16_t org_network_id, uint8_t sec_number, uint8_t last_sec_number) {
return ts_eit_alloc_init(service_id, transport_stream_id, org_network_id, 0x50, sec_number, last_sec_number);
}
static int ts_eit_add_stream(struct ts_eit *eit, uint16_t event_id, uint8_t running, time_t start_time, int duration_sec, uint8_t *desc, uint16_t desc_size) {
if (eit->streams_num == eit->streams_max - 1 || desc_size == 0) {
FREE(desc);
return 0;
}
uint16_t start_mjd;
uint32_t start_bcd;
uint32_t dur_bcd = ts_time_encode_bcd(duration_sec);
ts_time_encode_mjd(&start_mjd, &start_bcd, &start_time, NULL);
int stream_len = 12 + desc_size;
if (stream_len + eit->section_header->section_length > 4093) {
ts_LOGf("EIT no space left, max 4093, current %d will become %d!\n",
eit->section_header->section_length,
stream_len + eit->section_header->section_length);
free(desc);
return 0;
}
eit->section_header->section_length += stream_len;
struct ts_eit_stream *sinfo = calloc(1, sizeof(struct ts_eit_stream));
sinfo->event_id = event_id; // 2 bytes (16 bits)
sinfo->start_time_mjd = start_mjd; // 5 bytes (40 bits)
sinfo->start_time_bcd = start_bcd; //
sinfo->duration_bcd = dur_bcd; // 3 bytes (24 bits)
sinfo->running_status = running; // 2 bytes (3 bits), 1 == not running, 4 == running
sinfo->free_CA_mode = 0; // (1 bit) , 0 == not scrambled
sinfo->descriptor_size = desc_size; // (12 bits)
sinfo->descriptor_data = desc; // desc_size bytes
eit->streams[eit->streams_num] = sinfo;
eit->streams_num++;
ts_eit_regenerate_packet_data(eit);
return 1;
}
int ts_eit_add_short_event_descriptor(struct ts_eit *eit, uint16_t event_id, uint8_t running, time_t start_time, int duration_sec, char *event_name, char *event_short_descr) {
char *txt;
uint8_t event_len = event_name ? strlen(event_name) : 0;
uint8_t descr_len = event_short_descr ? strlen(event_short_descr) : 0;
int desc_size = 2 + 3; // 2 bytes tag header, 3 bytes ISO lang code
desc_size += 1 + event_len;
desc_size += 1 + descr_len;
if (desc_size > 255) {
ts_LOGf("EIT short event descriptor size > 255 is not supported (%d)!\n", desc_size);
return 0;
}
if (event_len == 0) {
ts_LOGf("EIT event_len == 0!\n");
return 0;
}
uint8_t *desc = calloc(1, desc_size);
int dpos = 0;
desc[dpos + 0] = 0x4d; // Short_event_descriptor
desc[dpos + 1] = desc_size - 2; // -2 Because of two byte header
desc[dpos + 2] = 'b';
desc[dpos + 3] = 'u';
desc[dpos + 4] = 'l';
desc[dpos + 5] = event_len;
dpos += 6;
txt = event_name;
while (txt[0]) {
desc[dpos++] = txt[0];
txt++;
}
desc[dpos++ ] = descr_len;
if (descr_len) {
txt = event_short_descr;
while (txt[0]) {
desc[dpos++] = txt[0];
txt++;
}
}
return ts_eit_add_stream(eit, event_id, running ? 4 : 1, start_time, duration_sec, desc, dpos);
}
int ts_eit_add_extended_event_descriptor(struct ts_eit *eit, uint16_t event_id, uint8_t running, time_t start_time, int duration_sec, char *text) {
if (!text)
return 0;
char *txt;
int desc_size = 2 + 3 + 1 + 1; // 2 bytes tag header
// 3 bytes ISO lang code
// 1 byte, desc_number, last_desc_number (4 bits + 4 bits)
// 1 byte length of items (0 because items are unsupported)
int text_len = strlen(text);
desc_size += 1 + text_len;
if (desc_size > 257) {
ts_LOGf("EIT extended event descriptor size > 255 is not supported (%d)!\n", desc_size);
return 0;
}
if (text_len == 0) {
ts_LOGf("EIT text_len == 0!\n");
return 0;
}
uint8_t *desc = calloc(1, desc_size);
int dpos = 0;
desc[dpos + 0] = 0x4e; // Extended_event_descriptor
desc[dpos + 1] = desc_size - 2; // -2 Because of two byte header
desc[dpos + 2] = (0 << 4) | (0 &~ 0xf0); // descriptor_number, last_descriptor_number;
desc[dpos + 3] = 'b';
desc[dpos + 4] = 'u';
desc[dpos + 5] = 'l';
desc[dpos + 6] = 0; // Length of items (items are not supported)
desc[dpos + 7] = text_len;
dpos += 8;
txt = text;
while (txt[0]) {
desc[dpos++] = txt[0];
txt++;
}
return ts_eit_add_stream(eit, event_id, running ? 4 : 1, start_time, duration_sec, desc, dpos);
}
|
