123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274 |
- /*
- * SDT table parser and 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"
-
- struct ts_sdt *ts_sdt_alloc() {
- struct ts_sdt *sdt = calloc(1, sizeof(struct ts_sdt));
- sdt->section_header = ts_section_data_alloc();
- sdt->streams_max = 128;
- sdt->streams = calloc(sdt->streams_max, sizeof(struct ts_sdt_stream *));
- return sdt;
- }
-
- static void ts_sdt_streams_data_free(struct ts_sdt *sdt) {
- int i;
- for (i=0;i<sdt->streams_num;i++) {
- if (sdt->streams[i]) {
- FREE(sdt->streams[i]->descriptor_data);
- FREE(sdt->streams[i]);
- }
- }
- }
-
- void ts_sdt_clear(struct ts_sdt *sdt) {
- if (!sdt)
- return;
- // save
- struct ts_section_header *section_header = sdt->section_header;
- struct ts_sdt_stream **streams = sdt->streams;
- int streams_max = sdt->streams_max;
- // free
- ts_sdt_streams_data_free(sdt);
- // clear
- ts_section_data_clear(section_header);
- memset(sdt, 0, sizeof(struct ts_sdt));
- // restore
- sdt->section_header = section_header;
- sdt->streams = streams;
- sdt->streams_max = streams_max;
- }
-
- void ts_sdt_free(struct ts_sdt **psdt) {
- struct ts_sdt *sdt = *psdt;
- if (sdt) {
- ts_section_data_free(&sdt->section_header);
- ts_sdt_streams_data_free(sdt);
- FREE(sdt->streams);
- FREE(*psdt);
- }
- }
-
- struct ts_sdt *ts_sdt_push_packet(struct ts_sdt *sdt, uint8_t *ts_packet) {
- struct ts_header ts_header;
- memset(&ts_header, 0, sizeof(struct ts_header));
-
- if (ts_packet_header_parse(ts_packet, &ts_header)) {
- // SDT should be with PID 0x11
- if (ts_header.pid != 0x11)
- goto OUT;
- // Received PUSI packet before table END, clear the table to start gathering new one
- if (ts_header.pusi && sdt->ts_header.pusi)
- ts_sdt_clear(sdt);
- if (!sdt->ts_header.pusi)
- sdt->ts_header = ts_header;
- }
-
- if (ts_header.pusi) {
- struct ts_section_header section_header;
- memset(§ion_header, 0, sizeof(struct ts_section_header));
-
- uint8_t *section_data = ts_section_header_parse(ts_packet, &sdt->ts_header, §ion_header);
- if (!section_data) {
- memset(&sdt->ts_header, 0, sizeof(struct ts_header));
- goto OUT;
- }
- // table_id should be 0x42 (service_description_section - actual_transport_stream)
- if (section_header.table_id != 0x42) {
- memset(&sdt->ts_header, 0, sizeof(struct ts_header));
- goto OUT;
- }
-
- // Set correct section_header
- ts_section_header_parse(ts_packet, &sdt->ts_header, sdt->section_header);
- }
-
- if (!sdt->initialized) {
- ts_section_add_packet(sdt->section_header, &ts_header, ts_packet);
- if (sdt->section_header->initialized) {
- if (!ts_sdt_parse(sdt))
- goto ERROR;
- }
- }
-
- OUT:
- return sdt;
-
- ERROR:
- ts_sdt_clear(sdt);
- return sdt;
- }
-
- int ts_sdt_parse(struct ts_sdt *sdt) {
- uint8_t *section_data = sdt->section_header->data;
- int section_len = sdt->section_header->data_len;
-
- // 3 bytes
- sdt->original_network_id = (section_data[0] << 8) | section_data[1];
- sdt->reserved = section_data[2];
-
- section_data = section_data + 3;
- section_len = section_len -3;
-
- while (section_len > 0) {
- if (sdt->streams_num == sdt->streams_max) {
- ts_LOGf("SDT contains too many streams (>%d), not all are initialized!\n", sdt->streams_max);
- break;
- }
-
- struct ts_sdt_stream *sinfo = calloc(1, sizeof(struct ts_sdt_stream));
-
- sinfo->service_id = (section_data[0] << 8) | section_data[1];
-
- sinfo->reserved1 = (section_data[2] &~ 0x03) >> 2; // xxxxxx11
- sinfo->EIT_schedule_flag = (section_data[2] &~ 0xFD) >> 1; // 111111x1
- sinfo->EIT_present_following_flag = (section_data[2] &~ 0xFE); // 1111111x
-
- sinfo->running_status = section_data[3] >> 5; // 111xxxxx
- sinfo->free_CA_mode = (section_data[3] &~ 0xE0) >> 4; // xxx1xxxx
- sinfo->descriptor_size = ((section_data[3] &~ 0xF0) << 8) | section_data[4]; // 1111xxxx xxxxxxxx
-
- sinfo->descriptor_data = NULL;
- if (sinfo->descriptor_size > 0) {
- sinfo->descriptor_data = malloc(sinfo->descriptor_size);
- memcpy(sinfo->descriptor_data, §ion_data[5], sinfo->descriptor_size);
- }
- sdt->streams[sdt->streams_num] = sinfo;
- sdt->streams_num++;
-
- section_data += 5 + sinfo->descriptor_size;
- section_len -= 5 + sinfo->descriptor_size;
- }
-
- if (!ts_crc32_section_check(sdt->section_header, "SDT"))
- return 0;
-
- sdt->initialized = 1;
- return 1;
- }
-
- void ts_sdt_generate(struct ts_sdt *sdt, uint8_t **ts_packets, int *num_packets) {
- uint8_t *secdata = ts_section_data_alloc_section();
- ts_section_header_generate(secdata, sdt->section_header, 0);
- int curpos = 8; // Compensate for the section header, frist data byte is at offset 8
-
- secdata[curpos + 0] = sdt->original_network_id >> 8; // 1111xxxx xxxxxxxx
- secdata[curpos + 1] = sdt->original_network_id &~ 0xff00;
- secdata[curpos + 2] = sdt->reserved;
- curpos += 3; // For the fields above
-
- int i;
- for(i=0;i<sdt->streams_num;i++) {
- struct ts_sdt_stream *stream = sdt->streams[i];
-
- secdata[curpos + 0] = stream->service_id >> 8; // xxxxxxxx xxxxxxxx
- secdata[curpos + 1] = stream->service_id &~ 0xff00;
-
- secdata[curpos + 2] = stream->reserved1 << 2; // xxxxxx11
- secdata[curpos + 2] |= stream->EIT_schedule_flag << 1; // 111111x1
- secdata[curpos + 2] |= stream->EIT_present_following_flag; // 1111111x
-
- secdata[curpos + 3] = stream->running_status << 5; // 111xxxxx
- secdata[curpos + 3] |= stream->free_CA_mode << 4; // xxx1xxxx
- secdata[curpos + 3] |= stream->descriptor_size >> 8; // 1111xxxx xxxxxxxx
- secdata[curpos + 4] = stream->descriptor_size &~ 0xff00;
- curpos += 5; // Compensate for the above
-
- if (stream->descriptor_size > 0) {
- memcpy(secdata + curpos, stream->descriptor_data, stream->descriptor_size);
- curpos += stream->descriptor_size;
- }
- }
- sdt->section_header->CRC = ts_section_data_calculate_crc(secdata, curpos);
- curpos += 4; // CRC
-
- ts_section_data_gen_ts_packets(&sdt->ts_header, secdata, curpos, sdt->section_header->pointer_field, ts_packets, num_packets);
-
- FREE(secdata);
- }
-
- struct ts_sdt *ts_sdt_copy(struct ts_sdt *sdt) {
- struct ts_sdt *newsdt = ts_sdt_alloc();
- int i;
- for (i=0;i<sdt->section_header->num_packets; i++) {
- newsdt = ts_sdt_push_packet(newsdt, sdt->section_header->packet_data + (i * TS_PACKET_SIZE));
- }
- if (newsdt->initialized) {
- return newsdt;
- } else {
- ts_LOGf("Error copying sdt!\n");
- ts_sdt_free(&newsdt);
- return NULL;
- }
- }
-
- void ts_sdt_check_generator(struct ts_sdt *sdt) {
- struct ts_sdt *sdt1 = ts_sdt_alloc();
- int i;
- for (i=0;i<sdt->section_header->num_packets;i++) {
- sdt1 = ts_sdt_push_packet(sdt1, sdt->section_header->packet_data + (i * TS_PACKET_SIZE));
- }
- ts_compare_data("SDT (tspacket->struct)",
- sdt1->section_header->packet_data,
- sdt->section_header->packet_data,
- sdt->section_header->num_packets * TS_PACKET_SIZE);
- ts_sdt_free(&sdt1);
-
- uint8_t *ts_packets;
- int num_packets;
- ts_sdt_generate(sdt, &ts_packets, &num_packets);
- if (num_packets != sdt->section_header->num_packets) {
- ts_LOGf("ERROR: num_packets:%d != sec->num_packets:%d\n", num_packets, sdt->section_header->num_packets);
- }
- ts_compare_data("SDT (struct->tspacket)", sdt->section_header->packet_data, ts_packets, num_packets * TS_PACKET_SIZE);
- free(ts_packets);
- }
-
- void ts_sdt_dump(struct ts_sdt *sdt) {
- struct ts_section_header *sec = sdt->section_header;
- int i;
-
- ts_section_dump(sec);
-
- ts_LOGf(" * SDT data\n");
- ts_LOGf(" * PID : %04x (%d)\n", sdt->ts_header.pid, sdt->ts_header.pid);
- ts_LOGf(" * org_net_id : %04x (%d)\n", sdt->original_network_id, sdt->original_network_id);
- ts_LOGf(" * reserved : %d\n", sdt->reserved);
- ts_LOGf(" * num_streams : %d\n", sdt->streams_num);
-
- for(i=0;i<sdt->streams_num;i++) {
- struct ts_sdt_stream *stream = sdt->streams[i];
- ts_LOGf(" * [%02d/%02d] Service_id: %04x (%d) Res1: %d EIT_schedule: %d EIT_present: %d Running_status: %d free_CA_mode: %d /es_info_size: %d/\n",
- i+1, sdt->streams_num,
- stream->service_id, stream->service_id,
- stream->reserved1,
- stream->EIT_schedule_flag,
- stream->EIT_present_following_flag,
- stream->running_status,
- stream->free_CA_mode,
- stream->descriptor_size);
- if (stream->descriptor_data) {
- ts_descriptor_dump(stream->descriptor_data, stream->descriptor_size);
- }
- }
-
- ts_sdt_check_generator(sdt);
- }
-
- int ts_sdt_is_same(struct ts_sdt *sdt1, struct ts_sdt *sdt2) {
- if (sdt1 == sdt2) return 1; // Same
- if (sdt1 && sdt2)
- return ts_section_is_same(sdt1->section_header, sdt2->section_header);
- else
- return 0;
- }
|