2 * Decode SDT and NIT from a TS stream (for instance dvr0), and output in a
3 * relatively machine-readable format.
5 * Based on the decode_sdt.c example from libdvbpsi, and uses some source code
10 * Dave Chapman <dave@dchapman.com> 2001, 2002.
11 * 2004-2011 Brice DUBOST
12 * 2013 Steinar H. Gunderson
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
40 #include <dvbpsi/dvbpsi.h>
41 #include <dvbpsi/psi.h>
42 #include <dvbpsi/demux.h>
43 #include <dvbpsi/descriptor.h>
44 #include <dvbpsi/sdt.h>
45 #include <dvbpsi/nit.h>
47 static int packet_num = 0;
48 static int last_used_packet_num = 0;
51 @brief The different encodings that can be used
52 Cf EN 300 468 Annex A (I used v1.9.1)
54 static const char *encodings_en300468[] ={
70 "ISO-10646", //control char 0x11
71 "GB2312", //control char 0x13
72 "BIG5", //control char 0x14
73 "ISO-10646/UTF8", //control char 0x15
76 // Convert text according to EN 300 468 annex A.
77 static int convert_en300468_string(char *string, int max_len)
79 int encoding_control_char = 8; //cf encodings_en300468
81 char *tempdest, *tempbuf;
83 /* remove control characters and convert to UTF-8 the channel name */
84 //If no channel encoding is specified, it seems that most of the broadcasters
85 //uses ISO/IEC 8859-9. But the norm (EN 300 468) said that it should be Latin-1 (ISO/IEC 6937 + euro)
87 //temporary buffers allocation
88 tempdest = tempbuf = (char *)malloc(sizeof(char)*2*strlen(string));
94 for (src = (unsigned char *)string; *src; src++) {
95 if (*src >= 0x20 && (*src < 0x80 || *src > 0x9f)) {
96 //We copy non-control characters
99 } else if (*src <= 0x20) {
100 //control character recognition based on EN 300 468 v1.9.1 Annex A
102 encoding_control_char=(int) *src+4-1;
103 } else if(*src == 0x10) { //ISO/IEC 8859 : See table A.4
104 src++;//we skip the current byte
105 src++;//This one is always set to 0
106 if (*src >= 0x01 && *src <=0x0f)
107 encoding_control_char=(int) *src-1;
109 else if (*src==0x11) // ISO/IEC 10646 : Basic Multilingual Plane
110 encoding_control_char = 15;
111 else if (*src==0x13) // GB-2312-1980 : Simplified Chinese Character
112 encoding_control_char = 16;
113 else if (*src==0x14) // Big5 subset of ISO/IEC 10646 : Traditional Chinese
114 encoding_control_char = 17;
115 else if (*src==0x15) // UTF-8 encoding of ISO/IEC 10646 : Basic Multilingual Plane
116 encoding_control_char = 18;
121 //we open the conversion table
122 cd = iconv_open("UTF8", encodings_en300468[encoding_control_char]);
124 size_t inSize, outSize = max_len;
126 //pointers initialisation because iconv change them, we store
130 iconv(cd, &tempdest, &inSize, &dest, &outSize);
135 return encoding_control_char;
139 static bool ReadPacket(int i_fd, uint8_t * p_dst)
141 static uint8_t buf[188 * 100];
142 static int in_buf_start = 0;
143 static int in_buf_end = 0;
146 // Skip to the first 0x47 byte.
147 while (in_buf_end > in_buf_start && buf[in_buf_start] != 0x47) {
151 if (in_buf_end - in_buf_start >= 188) {
152 memcpy(p_dst, buf + in_buf_start, 188);
157 // Check if there's a partial packet in the buffer.
158 int partial_len = in_buf_end - in_buf_start;
159 if (partial_len == 0) {
160 in_buf_start = in_buf_end = 0;
161 } else if (partial_len > 0) {
162 memmove(buf, buf + in_buf_start, partial_len);
164 in_buf_end = partial_len;
167 int ret = read(i_fd, buf + in_buf_start, sizeof(buf) - in_buf_end);
182 static void ParseSDT(void *p_zero, dvbpsi_sdt_t * p_sdt)
184 last_used_packet_num = packet_num;
185 dvbpsi_sdt_service_t *p_service = p_sdt->p_first_service;
186 for (dvbpsi_sdt_service_t * p_service = p_sdt->p_first_service;
188 p_service = p_service->p_next) {
189 int service_type = -1;
190 char provider_name[256] = { 0 };
191 char channel_name[256] = { 0 };
192 dvbpsi_descriptor_t *p_descriptor =
193 p_service->p_first_descriptor;
195 // Search for a Service Descriptor (0x48), which contains the provider and channel names.
196 for (dvbpsi_descriptor_t * p_descriptor = p_service->p_first_descriptor;
197 p_descriptor != NULL;
198 p_descriptor = p_descriptor->p_next) {
201 if (p_descriptor->i_tag != 0x48) {
204 service_type = p_descriptor->p_data[0];
205 ptr = p_descriptor->p_data + 1;
208 memcpy(provider_name, ptr, len);
209 provider_name[len] = 0;
213 memcpy(channel_name, ptr, len);
214 channel_name[len] = 0;
216 convert_en300468_string(provider_name, sizeof(provider_name));
217 convert_en300468_string(channel_name, sizeof(channel_name));
220 // Show television types only.
221 if (service_type == 0x01 || service_type == 0x11 || service_type == 0x16 ||
222 service_type == 0x19 || service_type == 0x1c) {
223 printf("sid %d/%d: ts_id=%d, provider_name=\"%s\", channel_name=\"%s\"\n",
224 p_sdt->i_network_id, p_service->i_service_id,
225 p_sdt->i_extension, provider_name,
229 dvbpsi_sdt_delete(p_sdt);
232 // little endian assumed
238 uint16_t orbital_position; // big-endian
239 uint8_t modulation_type : 2;
240 uint8_t modulation_system : 1;
241 uint8_t roll_off : 2;
242 uint8_t polarization : 2;
243 uint8_t west_east_flag : 1;
244 uint8_t symbol_rate_12;
245 uint8_t symbol_rate_34;
246 uint8_t symbol_rate_56;
247 uint8_t FEC_inner : 4;
248 uint8_t symbol_rate_7 : 4;
249 } descr_sat_delivery_t;
251 // Canal Digital stores their LCN in the NIT (Wikipedia says some do it in
252 // the BAT). I haven't been able to find any format for this, even in NorDIG's
253 // specification, so this is done by visual inspection.
254 static void ParseLCN(int network_id, const dvbpsi_descriptor_t *p_descriptor)
256 uint8_t *ptr = p_descriptor->p_data;
257 int channel_list_id = *ptr++;
259 // Skip the name and the three-letter country code.
265 for (int i = 0; i < len; i += 4) {
266 int sid = (ptr[i] << 8) | ptr[i + 1];
267 int lcn = ((ptr[i + 2] << 8) | ptr[i + 3]) & 0x3fff;
268 printf("lcn %d/%d/%d: lcn=%d\n", network_id, channel_list_id, sid, lcn);
272 static void ParseDSD(const dvbpsi_nit_t *p_nit, const dvbpsi_nit_ts_t *p_ts, const dvbpsi_descriptor_t *p_descriptor)
276 descr_sat_delivery_t *d =
277 (descr_sat_delivery_t *) p_descriptor->p_data;
278 printf("ts %d/%d: ", p_nit->i_network_id, p_ts->i_ts_id);
279 printf("freq=%x%02x%02x, ", d->frequency_4,
280 d->frequency_3, d->frequency_2,
282 printf("pol=%c, ", "HVLR"[d->polarization]);
283 if (d->modulation_system) {
284 printf("delivery_system=DVBS2, ");
286 printf("delivery_system=DVBS, ");
288 if (d->modulation_type == 0) {
289 printf("modulation=QAMAUTO, ");
290 } else if (d->modulation_type == 1) {
291 printf("modulation=QPSK, ");
292 } else if (d->modulation_type == 2) {
293 printf("modulation=8PSK, ");
294 } else if (d->modulation_type == 3) {
295 printf("modulation=QAM64, ");
297 printf("srate=%x%02x%02x, ", d->symbol_rate_12, d->symbol_rate_34, d->symbol_rate_56);
298 if (d->FEC_inner == 0) {
299 printf("coderate=auto");
300 } else if (d->FEC_inner == 1) {
301 printf("coderate=1/2");
302 } else if (d->FEC_inner == 2) {
303 printf("coderate=2/3");
304 } else if (d->FEC_inner == 3) {
305 printf("coderate=3/4");
306 } else if (d->FEC_inner == 4) {
307 printf("coderate=5/6");
308 } else if (d->FEC_inner == 5) {
309 printf("coderate=7/8");
310 } else if (d->FEC_inner == 6) {
311 printf("coderate=8/9");
312 } else if (d->FEC_inner == 7) {
313 printf("coderate=3/5");
314 } else if (d->FEC_inner == 8) {
315 printf("coderate=4/5");
316 } else if (d->FEC_inner == 9) {
317 printf("coderate=9/10");
319 printf("coderate=none");
324 static void ParseNIT(void *p_zero, dvbpsi_nit_t * p_nit)
326 last_used_packet_num = packet_num;
327 for (dvbpsi_nit_ts_t *p_ts = p_nit->p_first_ts;
329 p_ts = p_ts->p_next) {
330 // Search through the descriptors until we find one of type 0x43
331 // (Delivery System Descriptor).
332 for (dvbpsi_descriptor_t *p_descriptor = p_ts->p_first_descriptor;
333 p_descriptor != NULL;
334 p_descriptor = p_descriptor->p_next) {
335 if (p_descriptor->i_tag == 0x87) {
336 ParseLCN(p_nit->i_network_id, p_descriptor);
338 if (p_descriptor->i_tag == 0x43) {
339 ParseDSD(p_nit, p_ts, p_descriptor);
343 dvbpsi_nit_delete(p_nit);
346 /*****************************************************************************
347 * DVBPSI messaging callback
348 *****************************************************************************/
349 static void message(dvbpsi_t * handle, const dvbpsi_msg_level_t level,
353 case DVBPSI_MSG_ERROR:
354 fprintf(stderr, "Error: ");
356 case DVBPSI_MSG_WARN:
357 fprintf(stderr, "Warning: ");
359 case DVBPSI_MSG_DEBUG:
360 fprintf(stderr, "Debug: ");
362 default: /* do nothing */
365 fprintf(stderr, "%s\n", msg);
368 /*****************************************************************************
370 *****************************************************************************/
371 static void NewSubtableNIT(dvbpsi_t * p_dvbpsi, uint8_t i_table_id,
372 uint16_t i_extension, void *p_zero)
374 if (i_table_id == 0x40) {
375 if (!dvbpsi_nit_attach(p_dvbpsi, i_table_id, i_extension, ParseNIT, NULL))
376 fprintf(stderr, "Failed to attach PSI subdecoder\n");
380 /*****************************************************************************
382 *****************************************************************************/
383 static void NewSubtableSDT(dvbpsi_t * p_dvbpsi, uint8_t i_table_id,
384 uint16_t i_extension, void *p_zero)
386 if (i_table_id == 0x42 || i_table_id == 0x46) {
387 if (!dvbpsi_sdt_attach(p_dvbpsi, i_table_id, i_extension, ParseSDT, NULL))
388 fprintf(stderr, "Failed to attach SDT subdecoder\n");
392 /*****************************************************************************
394 *****************************************************************************/
395 int main(int i_argc, char *pa_argv[])
399 dvbpsi_t *p_dvbpsi_sdt, *p_dvbpsi_nit;
405 i_fd = open(pa_argv[1], 0);
409 p_dvbpsi_sdt = dvbpsi_new(&message, DVBPSI_MSG_ERROR);
410 if (p_dvbpsi_sdt == NULL)
413 p_dvbpsi_nit = dvbpsi_new(&message, DVBPSI_MSG_ERROR);
414 if (p_dvbpsi_nit == NULL)
417 if (!dvbpsi_AttachDemux(p_dvbpsi_sdt, NewSubtableSDT, NULL))
420 if (!dvbpsi_AttachDemux(p_dvbpsi_nit, NewSubtableNIT, NULL))
423 while (ReadPacket(i_fd, data)) {
424 uint16_t i_pid = ((uint16_t)(data[1] & 0x1f) << 8) + data[2];
426 dvbpsi_packet_push(p_dvbpsi_nit, data);
428 dvbpsi_packet_push(p_dvbpsi_sdt, data);
430 // After 100k packets with no new information, we assume we are done.
432 if ((packet_num - last_used_packet_num) >= 100000)
438 dvbpsi_DetachDemux(p_dvbpsi_sdt);
439 dvbpsi_delete(p_dvbpsi_sdt);
442 dvbpsi_DetachDemux(p_dvbpsi_nit);
443 dvbpsi_delete(p_dvbpsi_nit);