libtsfuncs is a library for mpeg PSI parsing and generation. https://georgi.unixsol.org/programs/libtsfuncs/

cat.c 10KB

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  1. /*
  2. * CAT table parser and generator
  3. * Copyright (C) 2010-2011 Unix Solutions Ltd.
  4. *
  5. * Released under MIT license.
  6. * See LICENSE-MIT.txt for license terms.
  7. */
  8. #include <stdio.h>
  9. #include <unistd.h>
  10. #include <netdb.h>
  11. #include <stdlib.h>
  12. #include <string.h>
  13. #include "tsfuncs.h"
  14. struct ts_cat *ts_cat_alloc() {
  15. struct ts_cat *cat = calloc(1, sizeof(struct ts_cat));
  16. cat->section_header = ts_section_data_alloc();
  17. return cat;
  18. }
  19. void ts_cat_clear(struct ts_cat *cat) {
  20. if (!cat)
  21. return;
  22. // save
  23. struct ts_section_header *section_header = cat->section_header;
  24. // free
  25. FREE(cat->program_info);
  26. // clear
  27. ts_section_data_clear(section_header);
  28. memset(cat, 0, sizeof(struct ts_cat));
  29. // restore
  30. cat->section_header = section_header;
  31. }
  32. void ts_cat_free(struct ts_cat **pcat) {
  33. struct ts_cat *cat = *pcat;
  34. if (cat) {
  35. ts_section_data_free(&cat->section_header);
  36. FREE(cat->program_info);
  37. FREE(*pcat);
  38. }
  39. }
  40. struct ts_cat *ts_cat_push_packet(struct ts_cat *cat, uint8_t *ts_packet) {
  41. struct ts_header ts_header;
  42. memset(&ts_header, 0, sizeof(struct ts_header));
  43. if (ts_packet_header_parse(ts_packet, &ts_header)) {
  44. // Received PUSI packet before table END, clear the table to start gathering new one
  45. if (ts_header.pusi && cat->ts_header.pusi)
  46. ts_cat_clear(cat);
  47. if (!cat->ts_header.pusi)
  48. cat->ts_header = ts_header;
  49. }
  50. if (ts_header.pusi) {
  51. struct ts_section_header section_header;
  52. memset(&section_header, 0, sizeof(struct ts_section_header));
  53. uint8_t *section_data = ts_section_header_parse(ts_packet, &cat->ts_header, &section_header);
  54. if (!section_data) {
  55. memset(&cat->ts_header, 0, sizeof(struct ts_header));
  56. goto OUT;
  57. }
  58. // table_id should be 0x01 (ca_map_section)
  59. if (section_header.table_id != 0x01) {
  60. memset(&cat->ts_header, 0, sizeof(struct ts_header));
  61. goto OUT;
  62. }
  63. // Set correct section_header
  64. ts_section_header_parse(ts_packet, &cat->ts_header, cat->section_header);
  65. }
  66. if (!cat->initialized) {
  67. ts_section_add_packet(cat->section_header, &ts_header, ts_packet);
  68. if (cat->section_header->initialized) {
  69. if (!ts_cat_parse(cat))
  70. goto ERROR;
  71. }
  72. }
  73. OUT:
  74. return cat;
  75. ERROR:
  76. ts_cat_clear(cat);
  77. return cat;
  78. }
  79. int ts_cat_parse(struct ts_cat *cat) {
  80. uint8_t *section_data = cat->section_header->data;
  81. int section_len = cat->section_header->data_len;
  82. if (section_len > 4096)
  83. return 0;
  84. /* Handle streams */
  85. uint8_t *stream_data = section_data;
  86. cat->program_info_size = section_len;
  87. cat->program_info = malloc(cat->program_info_size);
  88. if (!cat->program_info)
  89. return 0;
  90. memcpy(cat->program_info, stream_data, cat->program_info_size);
  91. if (!ts_crc32_section_check(cat->section_header, "CAT"))
  92. return 0;
  93. cat->initialized = 1;
  94. return 1;
  95. }
  96. void ts_cat_generate(struct ts_cat *cat, uint8_t **ts_packets, int *num_packets) {
  97. uint8_t *secdata = ts_section_data_alloc_section();
  98. ts_section_header_generate(secdata, cat->section_header, 0);
  99. int curpos = 8; // Compensate for the section header, frist data byte is at offset 8
  100. memcpy(secdata + curpos, cat->program_info, cat->program_info_size);
  101. curpos += cat->program_info_size;
  102. cat->section_header->CRC = ts_section_data_calculate_crc(secdata, curpos);
  103. curpos += 4; // CRC
  104. ts_section_data_gen_ts_packets(&cat->ts_header, secdata, curpos, cat->section_header->pointer_field, ts_packets, num_packets);
  105. FREE(secdata);
  106. }
  107. void ts_cat_regenerate_packets(struct ts_cat *cat) {
  108. uint8_t *ts_packets;
  109. int num_packets;
  110. ts_cat_generate(cat, &ts_packets, &num_packets);
  111. FREE(cat->section_header->packet_data);
  112. cat->section_header->packet_data = ts_packets;
  113. cat->section_header->num_packets = num_packets;
  114. }
  115. struct ts_cat *ts_cat_copy(struct ts_cat *cat) {
  116. struct ts_cat *newcat = ts_cat_alloc();
  117. int i;
  118. for (i=0;i<cat->section_header->num_packets; i++) {
  119. newcat = ts_cat_push_packet(newcat, cat->section_header->packet_data + (i * TS_PACKET_SIZE));
  120. }
  121. if (newcat->initialized) {
  122. return newcat;
  123. } else {
  124. ts_LOGf("Error copying cat!\n");
  125. ts_cat_free(&newcat);
  126. return NULL;
  127. }
  128. }
  129. void ts_cat_check_generator(struct ts_cat *cat) {
  130. struct ts_cat *cat1 = ts_cat_copy(cat);
  131. if (cat1) {
  132. ts_compare_data("CAT (tspacket->struct)",
  133. cat1->section_header->packet_data,
  134. cat->section_header->packet_data,
  135. cat->section_header->num_packets * TS_PACKET_SIZE);
  136. ts_cat_free(&cat1);
  137. }
  138. uint8_t *ts_packets;
  139. int num_packets;
  140. ts_cat_generate(cat, &ts_packets, &num_packets);
  141. if (num_packets != cat->section_header->num_packets) {
  142. ts_LOGf("ERROR: num_packets:%d != sec->num_packets:%d\n", num_packets, cat->section_header->num_packets);
  143. }
  144. ts_compare_data("CAT (struct->tspacket)", cat->section_header->packet_data, ts_packets, num_packets * TS_PACKET_SIZE);
  145. free(ts_packets);
  146. }
  147. void ts_cat_dump(struct ts_cat *cat) {
  148. struct ts_section_header *sec = cat->section_header;
  149. ts_section_dump(sec);
  150. if (cat->program_info_size > 0) {
  151. ts_LOGf(" * Descriptor dump:\n");
  152. ts_descriptor_dump(cat->program_info, cat->program_info_size);
  153. }
  154. ts_cat_check_generator(cat);
  155. }
  156. int ts_cat_is_same(struct ts_cat *cat1, struct ts_cat *cat2) {
  157. if (cat1 == cat2) return 1; // Same
  158. if (cat1 && cat2)
  159. return ts_section_is_same(cat1->section_header, cat2->section_header);
  160. else
  161. return 0;
  162. }
  163. enum CA_system ts_get_CA_sys(uint16_t CA_id) {
  164. if (CA_id >= 0x0100 && CA_id <= 0x01FF) return CA_SECA;
  165. if (CA_id >= 0x0500 && CA_id <= 0x05FF) return CA_VIACCESS;
  166. if (CA_id >= 0x0600 && CA_id <= 0x06FF) return CA_IRDETO;
  167. if (CA_id >= 0x0900 && CA_id <= 0x09FF) return CA_VIDEOGUARD;
  168. if (CA_id >= 0x0B00 && CA_id <= 0x0BFF) return CA_CONAX;
  169. if (CA_id >= 0x0D00 && CA_id <= 0x0DFF) return CA_CRYPTOWORKS;
  170. if (CA_id >= 0x1800 && CA_id <= 0x18FF) return CA_NAGRA;
  171. switch (CA_id) {
  172. case 0x4ABF: return CA_DGCRYPT;
  173. case 0x4AE0: return CA_DRECRYPT;
  174. case 0x4AE1: return CA_DRECRYPT;
  175. case 0x5581: return CA_BULCRYPT;
  176. case 0x4AEE: return CA_BULCRYPT;
  177. case 0x5501: return CA_GRIFFIN;
  178. case 0x5504: return CA_GRIFFIN;
  179. case 0x5506: return CA_GRIFFIN;
  180. case 0x5508: return CA_GRIFFIN;
  181. case 0x5509: return CA_GRIFFIN;
  182. case 0x550E: return CA_GRIFFIN;
  183. case 0x5511: return CA_GRIFFIN;
  184. }
  185. return CA_UNKNOWN;
  186. }
  187. char * ts_get_CA_sys_txt(enum CA_system CA_sys) {
  188. switch (CA_sys) {
  189. case CA_SECA: return "SECA";
  190. case CA_VIACCESS: return "VIACCESS";
  191. case CA_IRDETO: return "IRDETO";
  192. case CA_VIDEOGUARD: return "VIDEOGUARD";
  193. case CA_CONAX: return "CONAX";
  194. case CA_CRYPTOWORKS: return "CRYPTOWORKS";
  195. case CA_NAGRA: return "NAGRA";
  196. case CA_DRECRYPT: return "DRE-CRYPT";
  197. case CA_BULCRYPT: return "BULCRYPT";
  198. case CA_GRIFFIN: return "GRIFFIN";
  199. case CA_DGCRYPT: return "DGCRYPT";
  200. case CA_UNKNOWN: return "UNKNOWN";
  201. }
  202. return "UNKNOWN";
  203. }
  204. static int find_CA_descriptor(uint8_t *data, int data_len, enum CA_system req_CA_type, uint16_t *CA_id, uint16_t *CA_pid) {
  205. while (data_len >= 2) {
  206. uint8_t tag = data[0];
  207. uint8_t this_length = data[1];
  208. data += 2;
  209. data_len -= 2;
  210. if (tag == 9 && this_length >= 4) {
  211. uint16_t CA_ID = (data[0] << 8) | data[1];
  212. uint16_t CA_PID = ((data[2] & 0x1F) << 8) | data[3];
  213. if (ts_get_CA_sys(CA_ID) == req_CA_type) {
  214. *CA_id = CA_ID;
  215. *CA_pid = CA_PID;
  216. return 1;
  217. }
  218. }
  219. data_len -= this_length;
  220. data += this_length;
  221. }
  222. return 0;
  223. }
  224. int ts_get_emm_info(struct ts_cat *cat, enum CA_system req_CA_type, uint16_t *CA_id, uint16_t *CA_pid) {
  225. return find_CA_descriptor(cat->program_info, cat->program_info_size, req_CA_type, CA_id, CA_pid);
  226. }
  227. int ts_get_ecm_info(struct ts_pmt *pmt, enum CA_system req_CA_type, uint16_t *CA_id, uint16_t *CA_pid) {
  228. int i, result = find_CA_descriptor(pmt->program_info, pmt->program_info_size, req_CA_type, CA_id, CA_pid);
  229. if (!result) {
  230. for(i=0;i<pmt->streams_num;i++) {
  231. struct ts_pmt_stream *stream = pmt->streams[i];
  232. if (stream->ES_info) {
  233. result = find_CA_descriptor(stream->ES_info, stream->ES_info_size, req_CA_type, CA_id, CA_pid);
  234. if (result)
  235. break;
  236. }
  237. }
  238. }
  239. return result;
  240. }
  241. static int find_CA_descriptor_by_caid(uint8_t *data, int data_len, uint16_t caid, uint16_t *CA_pid) {
  242. while (data_len >= 2) {
  243. uint8_t tag = data[0];
  244. uint8_t this_length = data[1];
  245. data += 2;
  246. data_len -= 2;
  247. if (tag == 9 && this_length >= 4) {
  248. uint16_t CA_ID = (data[0] << 8) | data[1];
  249. uint16_t CA_PID = ((data[2] & 0x1F) << 8) | data[3];
  250. if (CA_ID == caid) {
  251. *CA_pid = CA_PID;
  252. return 1;
  253. }
  254. }
  255. data_len -= this_length;
  256. data += this_length;
  257. }
  258. return 0;
  259. }
  260. int ts_get_emm_info_by_caid(struct ts_cat *cat, uint16_t caid, uint16_t *ca_pid) {
  261. return find_CA_descriptor_by_caid(cat->program_info, cat->program_info_size, caid, ca_pid);
  262. }
  263. int ts_get_ecm_info_by_caid(struct ts_pmt *pmt, uint16_t caid, uint16_t *ca_pid) {
  264. int i, result = find_CA_descriptor_by_caid(pmt->program_info, pmt->program_info_size, caid, ca_pid);
  265. if (!result) {
  266. for(i=0;i<pmt->streams_num;i++) {
  267. struct ts_pmt_stream *stream = pmt->streams[i];
  268. if (stream->ES_info) {
  269. result = find_CA_descriptor_by_caid(stream->ES_info, stream->ES_info_size, caid, ca_pid);
  270. if (result)
  271. break;
  272. }
  273. }
  274. }
  275. return result;
  276. }
  277. static int find_CA_descriptor_by_pid(uint8_t *data, int data_len, uint16_t *caid, uint16_t pid) {
  278. while (data_len >= 2) {
  279. uint8_t tag = data[0];
  280. uint8_t this_length = data[1];
  281. data += 2;
  282. data_len -= 2;
  283. if (tag == 9 && this_length >= 4) {
  284. uint16_t CA_ID = (data[0] << 8) | data[1];
  285. uint16_t CA_PID = ((data[2] & 0x1F) << 8) | data[3];
  286. if (CA_PID == pid) {
  287. *caid = CA_ID;
  288. return 1;
  289. }
  290. }
  291. data_len -= this_length;
  292. data += this_length;
  293. }
  294. return 0;
  295. }
  296. int ts_get_emm_info_by_pid(struct ts_cat *cat, uint16_t *caid, uint16_t ca_pid) {
  297. return find_CA_descriptor_by_pid(cat->program_info, cat->program_info_size, caid, ca_pid);
  298. }
  299. int ts_get_ecm_info_by_pid(struct ts_pmt *pmt, uint16_t *caid, uint16_t ca_pid) {
  300. int i, result = find_CA_descriptor_by_pid(pmt->program_info, pmt->program_info_size, caid, ca_pid);
  301. if (!result) {
  302. for(i=0;i<pmt->streams_num;i++) {
  303. struct ts_pmt_stream *stream = pmt->streams[i];
  304. if (stream->ES_info) {
  305. result = find_CA_descriptor_by_pid(stream->ES_info, stream->ES_info_size, caid, ca_pid);
  306. if (result)
  307. break;
  308. }
  309. }
  310. }
  311. return result;
  312. }