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/*
* PSI Section functions
* 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 <ctype.h>
#include "tsfuncs.h"
#define have_left(X) \
do { if (data + (X) > data_end) return NULL; } while(0)
void ts_section_header_set_private_vars(struct ts_section_header *ts_section_header) {
if (ts_section_header->section_syntax_indicator) {
ts_section_header->data = ts_section_header->section_data + 3 + 5; // Skip header and extended header
ts_section_header->data_len = ts_section_header->section_length - 9; // 5 for extended header, 4 for crc at the end
} else {
ts_section_header->data = ts_section_header->section_data + 3; // Skip header
ts_section_header->data_len = ts_section_header->section_length;
}
ts_section_header->section_data_len = ts_section_header->section_length + 3; // 3 for section header
}
uint8_t *ts_section_header_parse(uint8_t *ts_packet, struct ts_header *ts_header, struct ts_section_header *ts_section_header) {
uint8_t *data = ts_packet + ts_header->payload_offset;
uint8_t *data_end = ts_packet + TS_PACKET_SIZE;
have_left(ts_section_header->pointer_field + 1);
ts_section_header->pointer_field = data[0];
data += ts_section_header->pointer_field + 1;
have_left(3);
ts_section_header->table_id = data[0];
ts_section_header->section_syntax_indicator = data[1] >> 7; // x1111111
ts_section_header->private_indicator = (data[1] &~ 0xBF) >> 6; // 1x111111
ts_section_header->reserved1 = (data[1] &~ 0xCF) >> 4; // 11xx1111
ts_section_header->section_length = ((data[1] &~ 0xF0) << 8) | data[2]; // 1111xxxx xxxxxxxx
data += 3;
if (ts_section_header->section_length == 0)
return NULL;
// Stuffing table, ignore.
if (ts_section_header->table_id == 0x72)
return NULL;
if (ts_section_header->section_syntax_indicator) {
have_left(5);
ts_section_header->ts_id_number = (data[0] << 8) | data[1]; // xxxxxxx xxxxxxx
ts_section_header->reserved2 = data[2] >> 6; // xx111111
ts_section_header->version_number = (data[2] &~ 0xC1) >> 1; // 11xxxxx1
ts_section_header->current_next_indicator = data[2] &~ 0xFE; // 1111111x
ts_section_header->section_number = data[3];
ts_section_header->last_section_number = data[4];
data += 5;
}
ts_section_header_set_private_vars(ts_section_header);
return data;
}
#undef have_left
void ts_section_header_generate(uint8_t *ts_packet, struct ts_section_header *ts_section_header, uint8_t start) {
ts_packet[start + 0] = ts_section_header->table_id;
ts_packet[start + 1] = ts_section_header->section_syntax_indicator << 7; // x1111111
ts_packet[start + 1] |= ts_section_header->private_indicator << 6; // 1x111111
ts_packet[start + 1] |= ts_section_header->reserved1 << 4; // 11xx1111
ts_packet[start + 1] |= ts_section_header->section_length >> 8; // 1111xxxx xxxxxxxx
ts_packet[start + 2] = ts_section_header->section_length &~ 0xff00; // 1111xxxx xxxxxxxx
if (ts_section_header->section_syntax_indicator) { // Extended table syntax
ts_packet[start + 3] = ts_section_header->ts_id_number >> 8; // xxxxxxxx xxxxxxxx
ts_packet[start + 4] = ts_section_header->ts_id_number &~ 0xff00;
ts_packet[start + 5] = ts_section_header->reserved2 << 6; // xx111111
ts_packet[start + 5] |= ts_section_header->version_number << 1; // 11xxxxx1
ts_packet[start + 5] |= ts_section_header->current_next_indicator; // 1111111x
ts_packet[start + 6] = ts_section_header->section_number;
ts_packet[start + 7] = ts_section_header->last_section_number;
}
}
int ts_section_is_same(struct ts_section_header *s1, struct ts_section_header *s2) {
// ts_LOGf("s1->table_id=%d s2->table_id=%d\n", s1->table_id, s2->table_id);
if (s1->table_id != s2->table_id)
return 0;
// ts_LOGf("s1->version_number=%d s2->version_number=%d\n", s1->version_number, s2->version_number);
if (s1->version_number != s2->version_number)
return 0;
// ts_LOGf("s1->section_number=%d s2->section_number=%d\n", s1->section_number, s2->section_number);
if (s1->section_number != s2->section_number)
return 0;
// ts_LOGf("s1->section_length=%d s2->section_length=%d\n", s1->section_number, s2->section_number);
if (s1->section_length != s2->section_length)
return 0;
return memcmp(s1->section_data, s2->section_data, s1->section_length) == 0;
}
#define IN(x, a, b) \
(x >= a && x <= b)
void ts_section_header_dump(struct ts_section_header *t) {
ts_LOGf("%s", " * Section header\n");
if (t->pointer_field)
ts_LOGf(" - Pointer field : %d\n", t->pointer_field);
ts_LOGf(" - Table id : %03x (%d) %s\n", t->table_id, t->table_id,
t->table_id == 0x00 ? "program_association_section" :
t->table_id == 0x01 ? "conditional_access_section" :
t->table_id == 0x02 ? "program_map_section" :
t->table_id == 0x03 ? "transport_stream_description_section" :
IN(t->table_id, 0x04, 0x3f) ? "reserved" :
t->table_id == 0x40 ? "network_information_section - actual_network" :
t->table_id == 0x41 ? "network_information_section - other_network" :
t->table_id == 0x42 ? "service_description_section - actual_transport_stream" :
IN(t->table_id, 0x43, 0x45) ? "reserved for future use" :
t->table_id == 0x46 ? "service_description_section - other_transport_stream" :
IN(t->table_id, 0x47, 0x49) ? "reserved for future use" :
t->table_id == 0x4a ? "bouquet_association_section" :
IN(t->table_id, 0x4b, 0x4d) ? "reserved for future use" :
t->table_id == 0x4e ? "event_information_section - actual_transport_stream, present/following" :
t->table_id == 0x4f ? "event_information_section - other_transport_stream, present/following" :
IN(t->table_id, 0x50, 0x5f) ? "event_information_section - actual_transport_stream, schedule" :
IN(t->table_id, 0x60, 0x6f) ? "event_information_section - other_transport_stream, schedule" :
t->table_id == 0x70 ? "time_date_section" :
t->table_id == 0x71 ? "running_status_section" :
t->table_id == 0x72 ? "stuffing_section" :
t->table_id == 0x73 ? "time_offset_section" :
t->table_id == 0x74 ? "application information section (TS 102 812 [15])" :
t->table_id == 0x75 ? "container section (TS 102 323 [13])" :
t->table_id == 0x76 ? "related content section (TS 102 323 [13])" :
t->table_id == 0x77 ? "content identifier section (TS 102 323 [13])" :
t->table_id == 0x78 ? "MPE-FEC section (EN 301 192 [4])" :
t->table_id == 0x79 ? "resolution notification section (TS 102 323 [13])" :
IN(t->table_id, 0x79, 0x7d) ? "reserved for future use" :
t->table_id == 0x7e ? "discontinuity_information_section" :
t->table_id == 0x7f ? "section_information_section" :
IN(t->table_id, 0x80, 0xfe) ? "user defined" :
t->table_id == 0xff ? "reserved" : "Impossible!"
);
ts_LOGf(" - Section length : %03x (%d) [num_packets:%d]\n",
t->section_length, t->section_length, t->num_packets);
if (!t->section_syntax_indicator) {
ts_LOGf(" - Private section syntax\n");
} else {
ts_LOGf(" - TS ID / Program No : %04x (%d)\n", t->ts_id_number, t->ts_id_number);
ts_LOGf(" - Version number %d, current next %d, section number %d, last section number %d\n",
t->version_number,
t->current_next_indicator,
t->section_number,
t->last_section_number);
}
if (t->CRC && t->CRC != 0xffffffff)
ts_LOGf(" - CRC : 0x%08x\n", t->CRC);
}
void ts_section_dump(struct ts_section_header *sec) {
int i;
ts_LOGf("%s table\n",
sec->table_id == 0x00 ? "PAT" :
sec->table_id == 0x01 ? "CAT" :
sec->table_id == 0x02 ? "PMT" :
sec->table_id == 0x03 ? "TSDT" :
IN(sec->table_id, 0x40, 0x41) ? "NIT" :
sec->table_id == 0x42 ? "SDT" :
sec->table_id == 0x46 ? "SDT" :
sec->table_id == 0x4a ? "BAT" :
IN(sec->table_id, 0x4e, 0x6f) ? "EIT" :
sec->table_id == 0x70 ? "TDT" :
sec->table_id == 0x71 ? "RST" :
sec->table_id == 0x72 ? "STUFFING" :
sec->table_id == 0x73 ? "TOT" :
sec->table_id == 0x7e ? "DIS" :
sec->table_id == 0x7f ? "SIS" :
IN(sec->table_id, 0x80, 0xfe) ? "USER_DEFINED" :
sec->table_id == 0xff ? "RESERVED" : "UNKNOWN"
);
for (i=0;i<sec->num_packets;i++) {
struct ts_header tshdr;
ts_packet_header_parse(sec->packet_data + (i * TS_PACKET_SIZE), &tshdr);
ts_packet_header_dump(&tshdr);
}
ts_section_header_dump(sec);
}
#undef IN
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