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tstxtdump.c
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tstxtdump.c
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/* tstxtdump */
/*=======================================================================*/
/* Copyright 2020 Philip Heron <phil@sanslogic.co.uk> */
/* */
/* 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 <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
FILE *fout = NULL;
int verbose = 0;
int olines = 0;
int errors = 0;
static uint8_t _rev8(uint8_t b)
{
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
return(b);
}
static void _parse_pes(const uint8_t *pes, size_t pes_len)
{
const uint8_t *data;
size_t data_len;
while(pes_len > 0)
{
if(verbose >= 2)
{
fprintf(stderr, " Packet start code prefix: 0x%02X%02X%02X\n", pes[0], pes[1], pes[2]);
fprintf(stderr, " Stream id: 0x%02X\n", pes[3]);
fprintf(stderr, " PES Packet length: %d\n", (pes[4] << 8) | pes[5]);
fprintf(stderr, " Marker bits: %d\n", (pes[6] >> 6) & 3);
fprintf(stderr, " Scrambling control: %d\n", (pes[6] >> 4) & 3);
fprintf(stderr, " Priority: %d\n", (pes[6] >> 3) & 1);
fprintf(stderr, " Data alignment indicator: %d\n", (pes[6] >> 2) & 1);
fprintf(stderr, " Copyright: %d\n", (pes[6] >> 1) & 1);
fprintf(stderr, " Original or Copy: %d\n", (pes[6] >> 0) & 1);
fprintf(stderr, " PTS DTS indicator: %d\n", (pes[7] >> 6) & 3);
fprintf(stderr, " ESCR flag: %d\n", (pes[7] >> 5) & 1);
fprintf(stderr, " ES rate flag: %d\n", (pes[7] >> 4) & 1);
fprintf(stderr, " DSM trick mode flag: %d\n", (pes[7] >> 3) & 1);
fprintf(stderr, "Additional copy info flag: %d\n", (pes[7] >> 2) & 1);
fprintf(stderr, " CRC flag: %d\n", (pes[7] >> 1) & 1);
fprintf(stderr, " extension flag: %d\n", (pes[7] >> 0) & 1);
fprintf(stderr, " PES header length: %d\n", pes[8]);
}
/* Validate the start code */
if(pes[0] != 0x00 || pes[1] != 0x00 || pes[2] != 0x01)
{
if(verbose >= 1)
{
fprintf(stderr, "Invalid Packet start code prefix 0x%02X%02X%02X - skipping PES packet\n", pes[0], pes[1], pes[2]);
}
errors++;
return;
}
/* Validate the stream ID */
if(pes[3] != 0xBD)
{
if(verbose >= 1)
{
fprintf(stderr, "Invalid Stream id 0x%02X - skipping PES packet\n", pes[3]);
}
errors++;
return;
}
data = &pes[8 + pes[8] + 1];
data_len = ((pes[4] << 8) | pes[5]) - pes[8] - 3;
if(verbose >= 2)
{
fprintf(stderr, "data_len = %ld\n", data_len);
fprintf(stderr, "data_identifier: %02X\n", data[0]);
}
/* Validate the length */
if(data_len <= 0 || data_len > pes_len)
{
if(verbose >= 1)
{
fprintf(stderr, "Invalid PES Packet length: %ld\n", data_len);
}
errors++;
return;
}
data_len -= 1;
data += 1;
while(data_len >= 46)
{
int j;
if(verbose >= 2)
{
//fprintf(stderr, "(%ld)\n", data_len);
fprintf(stderr, " data_unit_id: %d\n", data[0]);
fprintf(stderr, " data_unit_length: %d\n", data[1]);
fprintf(stderr, " reserved_future_use: %d\n", (data[2] >> 6) & 3);
fprintf(stderr, " field_parity: %d\n", (data[2] >> 5) & 1);
fprintf(stderr, " line_offset: 0x%02X\n", data[2] & 0x1F);
fprintf(stderr, " framing_code: %d\n", data[3]);
fprintf(stderr, "magazine_and_packet_address: %02X%02X\n", data[4], data[5]);
fprintf(stderr, " data: '");
for(j = 0; j < 40; j++)
{
fprintf(stderr, "%c", _rev8(data[6 + j]) & 0x7F);
}
fprintf(stderr, "'\n");
}
if(data[0] == 0x02 || data[0] == 0x03)
{
uint8_t rdata[42];
/* Reverse the bytes for output */
for(j = 0; j < 42; j++)
{
rdata[j] = _rev8(data[4 + j]);
}
fwrite(rdata, 42, 1, fout);
olines++;
}
data_len -= data[1] + 2;
data += data[1] + 2;
}
data_len = ((pes[4] << 8) | pes[5]) + 6;
pes_len -= data_len;
pes += data_len;
}
}
static void _print_usage(void)
{
fprintf(stderr,
"Usage: tstxtdump -p <pid> [-v] [-S <bytes>] [-P <bytes] <in.ts> <out.t42>\n"
"\n"
" -p, --pid <number> Select which PID to dump. Required.\n"
" -S, --skip <number> Number of bytes to skip at the beginning of\n"
" the file. Default: 0\n"
" -P, --pad <number> Number of bytes to skip after each packet.\n"
" -v, --verbose Enable verbose output.\n"
);
}
int main(int argc, char *argv[])
{
FILE *fin;
uint8_t pkt[188], *payload;
uint8_t payload_len;
uint8_t counter = 0xFF;
uint8_t pes[1024 * 4];
uint16_t pid = 0;
int skip = 0;
int pad = 0;
ssize_t pes_len = -1;
int c;
int option_index;
static struct option long_options[] = {
{ "pid", required_argument, 0, 'p' },
{ "skip", required_argument, 0, 'S' },
{ "pad", required_argument, 0, 'P' },
{ "verbose", no_argument, 0, 'v' },
{ 0, 0, 0, 0 }
};
opterr = 0;
while((c = getopt_long(argc, argv, "p:S:P:v", long_options, &option_index)) != -1)
{
switch(c)
{
case 'p': /* -p, --pid <number> */
pid = strtol(optarg, NULL, 0);
break;
case 'S': /* -S, --skip <bytes> */
skip = strtol(optarg, NULL, 0);
break;
case 'P': /* -P, --pad <bytes> */
pad = strtol(optarg, NULL, 0);
break;
case 'v': /* -v, --verbose */
verbose++;
break;
case '?':
_print_usage();
return(0);
}
}
if(argc != optind + 2)
{
_print_usage();
return(-1);
}
if(pid == 0 || pid >= 0x2000)
{
fprintf(stderr, "Invalid PID 0x%X\n", pid);
return(-1);
}
if(pad < 0)
{
fprintf(stderr, "Invalid pad count %d\n", pad);
return(-1);
}
if(skip < 0)
{
fprintf(stderr, "Invalid skip count %d\n", skip);
return(-1);
}
fprintf(stderr, "Dumping '%s' (PID 0x%X) > '%s'\n", argv[optind + 0], pid, argv[optind + 1]);
fin = fopen(argv[optind + 0], "rb");
if(!fin)
{
perror(argv[optind + 0]);
return(-1);
}
fout = fopen(argv[optind + 1], "wb");
if(!fout)
{
perror(argv[optind + 1]);
fclose(fin);
return(-1);
}
fseek(fin, skip, SEEK_CUR);
while(fread(pkt, 188, 1, fin) == 1)
{
if(pkt[0] != 0x47)
{
int i;
c = 0;
do
{
for(i = 0; i < 188; i++)
{
if(pkt[i] == 0x47) break;
}
c += i;
memmove(pkt, &pkt[i], 188 - i);
if(fread(&pkt[188 - i], i, 1, fin) != 1)
{
i = -1;
break;
}
}
while(i == 188);
if(i == -1)
{
/* EOF */
break;
}
if(verbose >= 1)
{
fprintf(stderr, "Skipped %d bytes\n", c);
}
}
/* Skip PIDs we don't need */
if((((pkt[1] << 8) | pkt[2]) & 0x1FFF) != pid)
{
fseek(fin, pad, SEEK_CUR);
continue;
}
if(counter != 0xFF && counter != (pkt[3] & 0x0F))
{
if(verbose >= 1)
{
fprintf(stderr, "Continuity counter interruption %d != %d\n", pkt[3] & 0x0F, counter);
}
errors++;
pes_len = -1;
}
if(verbose >= 2)
{
/* Dump TS header */
fprintf(stderr, " Transport error indicator (TEI): %d\n", (pkt[1] >> 7) & 1);
fprintf(stderr, "Payload unit start indicator (PUSI): %d\n", (pkt[1] >> 6) & 1);
fprintf(stderr, " Transport priority: %d\n", (pkt[1] >> 5) & 1);
fprintf(stderr, " PID: %d\n", ((pkt[1] << 8) | pkt[2]) & 0x1FFF);
fprintf(stderr, " Transport scrambling control (TSC): %d\n", (pkt[3] >> 6) & 3);
fprintf(stderr, " Adaptation field control: %d\n", (pkt[3] >> 4) & 3);
fprintf(stderr, " Continuity counter: %d\n", pkt[3] & 0x0F);
fprintf(stderr, "---------------------------------------\n");
}
payload = &pkt[4];
payload_len = 188 - 4;
if((pkt[3] >> 5) & 1)
{
if(verbose >= 2)
{
/* Dump adaptation field */
fprintf(stderr, " Adaptation field length: %d\n", payload[0]);
fprintf(stderr, " Discontinuity indicator: %d\n", (payload[1] >> 7) & 1);
fprintf(stderr, " Random access indicator: %d\n", (payload[1] >> 6) & 1);
fprintf(stderr, "Elementary stream priority indicator: %d\n", (payload[1] >> 5) & 1);
fprintf(stderr, " PCR flag: %d\n", (payload[1] >> 4) & 1);
fprintf(stderr, " OPCR flag: %d\n", (payload[1] >> 3) & 1);
fprintf(stderr, " Splicing point flag: %d\n", (payload[1] >> 2) & 1);
fprintf(stderr, " Transport private data flag: %d\n", (payload[1] >> 1) & 1);
fprintf(stderr, " Adaptation field extension flag: %d\n", (payload[1] >> 0) & 1);
if((payload[1] >> 4) & 1)
{
fprintf(stderr, " PCR: -\n");
}
if((payload[1] >> 3) & 1)
{
fprintf(stderr, " OPCR: -\n");
}
if((payload[1] >> 2) & 1)
{
fprintf(stderr, " Splice countdown: -\n");
}
if((payload[1] >> 1) & 1)
{
fprintf(stderr, " Transport private data length: -\n");
}
fprintf(stderr, "---------------------------------------\n");
}
/* Move payload pointer ahead to actual payload */
payload_len -= payload[0] + 1;
payload += payload[0] + 1;
}
if((pkt[1] >> 6) & 1)
{
if(pes_len > 0)
{
_parse_pes(pes, pes_len);
}
pes_len = 0;
}
if(pes_len >= 0)
{
if(pes_len + payload_len >= 1024 * 4)
{
fprintf(stderr, "PES packet too large\n");
return(-1);
}
memcpy(&pes[pes_len], payload, payload_len);
pes_len += payload_len;
}
counter = (pkt[3] + ((pkt[3] >> 4) & 1)) & 0x0F;
if(verbose >= 2)
{
fprintf(stderr, "\n");
}
fseek(fin, pad, SEEK_CUR);
}
fclose(fout);
fclose(fin);
fprintf(stderr, "Dumped %d lines (%d errors)\n", olines, errors);
return(0);
}