check_cc_pid: Check continuity counter for only 1 PID.

.gitignore

@@ -24,6 +24,7 @@ stamp-*
 *-stamp
 doc/doxygen
 doc/decoder.png
+examples/check_cc_pid
 examples/decode_mpeg
 examples/decode_pat
 examples/decode_pmt

examples/Makefile.am

@@ -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

examples/check_cc_pid.c

+#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;
+}