Commit 6befa2b6 authored by Jean-Paul Saman's avatar Jean-Paul Saman

check_cc_pid: Check continuity counter for only 1 PID.

parent a4fddc3a
......@@ -24,6 +24,7 @@ stamp-*
*-stamp
doc/doxygen
doc/decoder.png
examples/check_cc_pid
examples/decode_mpeg
examples/decode_pat
examples/decode_pmt
......
......@@ -3,12 +3,16 @@
SUBDIRS = dvbinfo
DIST_SUBDIRS = $(SUBDIRS)
noinst_PROGRAMS = decode_pat decode_pmt get_pcr_pid decode_sdt decode_mpeg decode_bat dump_pids
noinst_PROGRAMS = decode_pat decode_pmt get_pcr_pid decode_sdt decode_mpeg decode_bat dump_pids check_cc_pid
dump_pids_SOURCES = dump_pids.c
dump_pids_CPPFLAGS =
dump_pids_LDFLAGS =
check_cc_pid_SOURCES = check_cc_pid.c
check_cc_pid_CPPFLAGS =
check_cc_pid_LDFLAGS =
decode_pat_SOURCES = decode_pat.c
decode_pat_CPPFLAGS = -DDVBPSI_DIST
decode_pat_LDFLAGS = -L../src -ldvbpsi
......
#include "config.h"
#if defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#elif defined(HAVE_STDINT_H)
# include <stdint.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
static inline uint32_t ts_getcc(uint8_t *packet)
{
return (packet[3] & 0x0f);
}
static inline uint32_t ts_getpid(uint8_t *packet)
{
assert(packet[0] == 0x47);
return ((uint16_t)(packet[1] & 0x1f) << 8) + packet[2];
}
int main(int argc, char *argv[])
{
if (argc != 3) {
printf("Usage: check_cc_pid <filename> <pid>\n");
return -1;
}
/* Get arguments */
char *fname = argv[1];
uint32_t tpid = atoi(argv[2]); /* PID to track */
int file = open(fname, O_RDONLY | O_NONBLOCK);
if (file < 0) {
perror(argv[1]);
printf("error opening %s\n", argv[1]);
return -1;
}
int32_t s = 188; /* COULD ALSO BE 192 */
uint8_t p[188] = { 0 };
int64_t n = 0;
size_t len = 0;
uint32_t tcc = 0;
for (;;) {
/* slow read */
len = read(file, &p[0], s);
if (len == 0)
break;
uint32_t pid = ts_getpid(&p[0]);
uint32_t cc = ts_getcc(&p[0]);
n++;
tcc = cc;
if (pid == tpid)
printf("packet %ld, pid %u (0x%x), cc %d %s\n",
n, pid, pid, cc,
((cc % 16) == (tcc + 1)%16) ? "discontinuity" : "");
}
close(file);
return 0;
}
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