tvheadend/psi.c
2008-08-25 17:46:44 +00:00

632 lines
14 KiB
C

/*
* Multicasted IPTV Input
* Copyright (C) 2007 Andreas Öman
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <libavutil/common.h>
#include <libavutil/avstring.h>
#include "tvhead.h"
#include "psi.h"
#include "transports.h"
#include "dvb/dvb_support.h"
#include "tsdemux.h"
#include "parsers.h"
int
psi_section_reassemble(psi_section_t *ps, uint8_t *data, int len,
int start, int chkcrc)
{
int remain, a, tsize;
if(start)
ps->ps_offset = 0;
if(ps->ps_offset < 0)
return -1;
remain = PSI_SECTION_SIZE - ps->ps_offset;
a = FFMAX(0, FFMIN(remain, len));
memcpy(ps->ps_data + ps->ps_offset, data, a);
ps->ps_offset += a;
tsize = 3 + (((ps->ps_data[1] & 0xf) << 8) | ps->ps_data[2]);
if(ps->ps_offset < tsize)
return -1;
if(chkcrc && psi_crc32(ps->ps_data, tsize))
return -1;
ps->ps_offset = tsize - (chkcrc ? 4 : 0);
return 0;
}
/**
* PAT parser, from ISO 13818-1
*/
int
psi_parse_pat(th_transport_t *t, uint8_t *ptr, int len,
pid_section_callback_t *pmt_callback)
{
uint16_t prognum;
uint16_t pid;
th_stream_t *st;
if(len < 5)
return -1;
ptr += 5;
len -= 5;
while(len >= 4) {
prognum = ptr[0] << 8 | ptr[1];
pid = (ptr[2] & 0x1f) << 8 | ptr[3];
if(prognum != 0) {
st = transport_add_stream(t, pid, HTSTV_PMT);
st->st_section_docrc = 1;
st->st_got_section = pmt_callback;
}
ptr += 4;
len -= 4;
}
return 0;
}
/**
* Append CRC
*/
static int
psi_append_crc32(uint8_t *buf, int offset, int maxlen)
{
uint32_t crc;
if(offset + 4 > maxlen)
return -1;
crc = psi_crc32(buf, offset);
buf[offset + 0] = crc >> 24;
buf[offset + 1] = crc >> 16;
buf[offset + 2] = crc >> 8;
buf[offset + 3] = crc;
assert(psi_crc32(buf, offset + 4) == 0);
return offset + 4;
}
/**
* PAT generator
*/
int
psi_build_pat(th_transport_t *t, uint8_t *buf, int maxlen, int pmtpid)
{
if(maxlen < 12)
return -1;
buf[0] = 0;
buf[1] = 0xb0; /* reserved */
buf[2] = 12 + 4 - 3; /* Length */
buf[3] = 0x00; /* transport stream id */
buf[4] = 0x01;
buf[5] = 0xc1; /* reserved + current_next_indicator + version */
buf[6] = 0;
buf[7] = 0;
buf[8] = 0; /* Program number, we only have one program */
buf[9] = 1;
buf[10] = 0xe0 | (pmtpid >> 8);
buf[11] = pmtpid;
return psi_append_crc32(buf, 12, maxlen);
}
/**
* PMT parser, from ISO 13818-1 and ETSI EN 300 468
*/
int
psi_parse_pmt(th_transport_t *t, uint8_t *ptr, int len, int chksvcid)
{
uint16_t pcr_pid, pid;
uint8_t estype;
int dllen;
uint8_t dtag, dlen;
uint16_t sid;
tv_streamtype_t hts_stream_type;
th_stream_t *st;
char lang[4];
int frameduration;
if(len < 9)
return -1;
sid = ptr[0] << 8 | ptr[1];
pcr_pid = (ptr[5] & 0x1f) << 8 | ptr[6];
dllen = (ptr[7] & 0xf) << 8 | ptr[8];
t->tht_pcr_pid = pcr_pid;
ptr += 9;
len -= 9;
if(chksvcid && sid != t->tht_dvb_service_id)
return -1;
while(dllen > 1) {
dtag = ptr[0];
dlen = ptr[1];
len -= 2; ptr += 2; dllen -= 2;
if(dlen > len)
break;
switch(dtag) {
case DVB_DESC_CA:
st = transport_add_stream(t, (ptr[2] & 0x1f) << 8 | ptr[3], HTSTV_CA);
st->st_caid = (ptr[0] << 8) | ptr[1];
break;
default:
break;
}
len -= dlen; ptr += dlen; dllen -= dlen;
}
while(len >= 5) {
estype = ptr[0];
pid = (ptr[1] & 0x1f) << 8 | ptr[2];
dllen = (ptr[3] & 0xf) << 8 | ptr[4];
ptr += 5;
len -= 5;
frameduration = 0;
hts_stream_type = 0;
switch(estype) {
case 0x01:
case 0x02:
hts_stream_type = HTSTV_MPEG2VIDEO;
break;
case 0x03:
case 0x04:
case 0x81:
hts_stream_type = HTSTV_MPEG2AUDIO;
break;
case 0x1b:
hts_stream_type = HTSTV_H264;
break;
}
memset(lang, 0, 4);
while(dllen > 1) {
dtag = ptr[0];
dlen = ptr[1];
len -= 2; ptr += 2; dllen -= 2;
if(dlen > len)
break;
switch(dtag) {
case DVB_DESC_VIDEO_STREAM:
frameduration = mpeg2video_framedurations[(ptr[0] >> 3) & 0xf];
break;
case DVB_DESC_LANGUAGE:
memcpy(lang, ptr, 3);
break;
case DVB_DESC_TELETEXT:
if(estype == 0x06)
hts_stream_type = HTSTV_TELETEXT;
break;
case DVB_DESC_AC3:
if(estype == 0x06 || estype == 0x81)
hts_stream_type = HTSTV_AC3;
break;
default:
break;
}
len -= dlen; ptr += dlen; dllen -= dlen;
}
if(hts_stream_type != 0) {
st = transport_add_stream(t, pid, hts_stream_type);
st->st_tb = (AVRational){1, 90000};
memcpy(st->st_lang, lang, 4);
if(st->st_frame_duration == 0)
st->st_frame_duration = frameduration;
}
}
if(t->tht_pmt_seen == 0)
t->tht_config_change(t);
t->tht_pmt_seen = 1;
return 0;
}
/**
* PAT generator
*/
int
psi_build_pmt(th_muxer_t *tm, uint8_t *buf0, int maxlen, int pcrpid)
{
th_stream_t *st;
th_muxstream_t *tms;
int c, tlen, dlen, l;
uint8_t *buf, *buf1;
buf = buf0;
if(maxlen < 12)
return -1;
buf[0] = 2; /* table id, always 2 */
buf[3] = 0x00; /* program id */
buf[4] = 0x01;
buf[5] = 0xc1; /* current_next_indicator + version */
buf[6] = 0;
buf[7] = 0;
buf[8] = 0xe0 | (pcrpid >> 8);
buf[9] = pcrpid;
buf[10] = 0xf0; /* Program info length */
buf[11] = 0x00; /* We dont have any such things atm */
buf += 12;
tlen = 12;
LIST_FOREACH(tms, &tm->tm_streams, tms_muxer_link0) {
st = tms->tms_stream;
if(tms->tms_index == 0)
continue;
switch(st->st_type) {
case HTSTV_MPEG2VIDEO:
c = 0x02;
break;
case HTSTV_MPEG2AUDIO:
c = 0x03;
break;
case HTSTV_H264:
c = 0x1b;
break;
case HTSTV_AC3:
c = 0x06;
break;
default:
continue;
}
buf[0] = c;
buf[1] = 0xe0 | (tms->tms_index >> 8);
buf[2] = tms->tms_index;
buf1 = &buf[3];
tlen += 5;
buf += 5;
dlen = 0;
switch(st->st_type) {
case HTSTV_AC3:
buf[0] = DVB_DESC_AC3;
buf[1] = 1;
buf[2] = 0; /* XXX: generate real AC3 desc */
dlen = 3;
break;
default:
break;
}
tlen += dlen;
buf += dlen;
buf1[0] = 0xf0 | (dlen >> 8);
buf1[1] = dlen;
}
l = tlen - 3 + 4;
buf0[1] = 0xb0 | (l >> 8);
buf0[2] = l;
return psi_append_crc32(buf0, tlen, maxlen);
}
/*
* CRC32
*/
static uint32_t crc_tab[256] = {
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
uint32_t
psi_crc32(uint8_t *data, size_t datalen)
{
uint32_t crc = 0xffffffff;
while(datalen--)
crc = (crc << 8) ^ crc_tab[((crc >> 24) ^ *data++) & 0xff];
return crc;
}
static struct strtab caidnametab[] = {
{ "Seca", 0x0100 },
{ "CCETT", 0x0200 },
{ "Deutsche Telecom", 0x0300 },
{ "Eurodec", 0x0400 },
{ "Viaccess", 0x0500 },
{ "Irdeto", 0x0600 },
{ "Irdeto", 0x0602 },
{ "Irdeto", 0x0604 },
{ "Jerroldgi", 0x0700 },
{ "Matra", 0x0800 },
{ "NDS", 0x0900 },
{ "Nokia", 0x0A00 },
{ "Conax", 0x0B00 },
{ "NTL", 0x0C00 },
{ "CryptoWorks", 0x0D00 },
{ "PowerVu", 0x0E00 },
{ "Sony", 0x0F00 },
{ "Tandberg", 0x1000 },
{ "Thompson", 0x1100 },
{ "TV-Com", 0x1200 },
{ "HPT", 0x1300 },
{ "HRT", 0x1400 },
{ "IBM", 0x1500 },
{ "Nera", 0x1600 },
{ "BetaCrypt", 0x1700 },
{ "BetaCrypt", 0x1702 },
{ "BetaCrypt", 0x1722 },
{ "BetaCrypt", 0x1762 },
{ "NagraVision", 0x1800 },
{ "Titan", 0x1900 },
{ "Telefonica", 0x2000 },
{ "Stentor", 0x2100 },
{ "Tadiran Scopus", 0x2200 },
{ "BARCO AS", 0x2300 },
{ "StarGuide", 0x2400 },
{ "Mentor", 0x2500 },
{ "EBU", 0x2600 },
{ "GI", 0x4700 },
{ "Telemann", 0x4800 }
};
const char *
psi_caid2name(uint16_t caid)
{
const char *s = val2str(caid, caidnametab);
static char buf[20];
if(s != NULL)
return s;
snprintf(buf, sizeof(buf), "0x%x", caid);
return buf;
}
/**
*
*/
static struct strtab streamtypetab[] = {
{ "MPEG2VIDEO", HTSTV_MPEG2VIDEO },
{ "MPEG2AUDIO", HTSTV_MPEG2AUDIO },
{ "H264", HTSTV_H264 },
{ "AC3", HTSTV_AC3 },
{ "TELETEXT", HTSTV_TELETEXT },
{ "SUBTITLES", HTSTV_SUBTITLES },
{ "CA", HTSTV_CA },
{ "PMT", HTSTV_PMT },
{ "PAT", HTSTV_PAT },
};
const char *
htstvstreamtype2txt(tv_streamtype_t s)
{
return val2str(s, streamtypetab) ?: "INVALID";
}
/**
* Store transport settings into message
*/
void
psi_save_transport_settings(htsmsg_t *m, th_transport_t *t)
{
th_stream_t *st;
htsmsg_t *sub;
htsmsg_add_u32(m, "pcr", t->tht_pcr_pid);
htsmsg_add_u32(m, "disabled", !!t->tht_disabled);
LIST_FOREACH(st, &t->tht_streams, st_link) {
sub = htsmsg_create();
htsmsg_add_u32(sub, "pid", st->st_pid);
htsmsg_add_str(sub, "type", val2str(st->st_type, streamtypetab) ?: "?");
if(st->st_lang[0])
htsmsg_add_str(sub, "language", st->st_lang);
if(st->st_type == HTSTV_CA)
htsmsg_add_str(sub, "caid", psi_caid2name(st->st_caid));
if(st->st_frame_duration)
htsmsg_add_u32(sub, "frameduration", st->st_frame_duration);
htsmsg_add_msg(m, "stream", sub);
}
}
/**
* Load transport info from htsmsg
*/
void
psi_load_transport_settings(htsmsg_t *m, th_transport_t *t)
{
htsmsg_t *c;
htsmsg_field_t *f;
uint32_t u32;
th_stream_t *st;
tv_streamtype_t type;
const char *v;
uint32_t pid, i;
if(!htsmsg_get_u32(m, "pcr", &u32))
t->tht_pcr_pid = u32;
if(!htsmsg_get_u32(m, "disabled", &u32))
t->tht_disabled = u32;
HTSMSG_FOREACH(f, m) {
if(strcmp(f->hmf_name, "stream"))
continue;
if((c = htsmsg_get_msg_by_field(f)) == NULL)
continue;
if((v = htsmsg_get_str(c, "type")) == NULL)
continue;
type = str2val(v, streamtypetab);
if(type == -1)
continue;
if(htsmsg_get_u32(c, "pid", &pid))
continue;
st = transport_add_stream(t, pid, type);
st->st_tb = (AVRational){1, 90000};
if((v = htsmsg_get_str(c, "lang")) != NULL)
av_strlcpy(st->st_lang, v, 4);
if(!htsmsg_get_u32(c, "frameduration", &u32))
st->st_frame_duration = u32;
if((v = htsmsg_get_str(c, "caid")) != NULL) {
i = str2val(v, caidnametab);
st->st_caid = i < 0 ? strtol(v, NULL, 0) : i;
}
}
}