linuxdvb: ensure that PID filters are not installed early

I thought this was causing stale data to enter the pipelines, turns
out this was not the case (it was just a NIT entry for a mux that
didn't exist colliding with one that did).

However still a useful mod.
(cherry picked from commit a7c7b76e8f8f10ece3af3132964c8afd19b26391)

src/input/mpegts.h

@@ -530,6 +530,9 @@ int mpegts_mux_set_tsid ( mpegts_mux_t *mm, uint16_t tsid );
 int mpegts_mux_set_onid ( mpegts_mux_t *mm, uint16_t onid );
 int mpegts_mux_set_crid_authority ( mpegts_mux_t *mm, const char *defauth );
 
+void mpegts_mux_open_table ( mpegts_mux_t *mm, mpegts_table_t *mt );
+void mpegts_mux_close_table ( mpegts_mux_t *mm, mpegts_table_t *mt );
+
 size_t mpegts_input_recv_packets
   (mpegts_input_t *mi, mpegts_mux_instance_t *mmi, uint8_t *tsb, size_t len,
    int64_t *pcr, uint16_t *pcr_pid, const char *name);

src/input/mpegts/linuxdvb/linuxdvb_frontend.c

@@ -289,6 +289,9 @@ linuxdvb_frontend_open_pid
   struct dmx_pes_filter_params dmx_param;
   int fd = tvh_open(lfe->lfe_dmx_path, O_RDWR, 0);
 
+  if (!lfe->lfe_locked || lfe->lfe_fullmux)
+    return -1;
+
   if (!name) {
     lfe->mi_display_name((mpegts_input_t*)lfe, buf, sizeof(buf));
     name = buf;
@@ -432,12 +435,18 @@ linuxdvb_frontend_default_tables
 }
 
 static void
-linuxdvb_frontend_open_services ( linuxdvb_frontend_t *lfe )
+linuxdvb_frontend_open_all
+  ( linuxdvb_frontend_t *lfe, mpegts_mux_t *mm )
 {
+  mpegts_table_t *mt;
   service_t *s;
   LIST_FOREACH(s, &lfe->mi_transports, s_active_link) {
-    linuxdvb_frontend_open_service((mpegts_input_t*)lfe,
-                                   (mpegts_service_t*)s, 0);
+    lfe->mi_open_service((mpegts_input_t*)lfe,
+                         (mpegts_service_t*)s, 0);
+  }
+  LIST_FOREACH(mt, &mm->mm_tables, mt_link) {
+    if (mt->mt_fd == -1)
+      mt->mt_fd = lfe->lfe_open_pid(lfe, mt->mt_pid, NULL);
   }
 }
 
@@ -539,7 +548,7 @@ linuxdvb_frontend_monitor ( void *aux )
       linuxdvb_frontend_default_tables(lfe, (linuxdvb_mux_t*)mm);
 
       /* Services */
-      linuxdvb_frontend_open_services(lfe);
+      linuxdvb_frontend_open_all(lfe, mm);
 
     /* Re-arm (quick) */
     } else {

src/input/mpegts/linuxdvb/linuxdvb_mux.c

@@ -429,34 +429,25 @@ linuxdvb_mux_create_instances ( mpegts_mux_t *mm )
 static void
 linuxdvb_mux_open_table ( mpegts_mux_t *mm, mpegts_table_t *mt )
 {
-  char buf[256];
   linuxdvb_frontend_t *lfe;
-  if (mt->mt_pid >= 0x2000)
-    return;
-  mm->mm_display_name(mm, buf, sizeof(buf));
-  if (!mm->mm_table_filter[mt->mt_pid])
-    tvhtrace("mpegts", "%s - opened table %s pid %04X (%d)",
-             buf, mt->mt_name, mt->mt_pid, mt->mt_pid);
-  mm->mm_table_filter[mt->mt_pid] = 1;
+  mpegts_mux_open_table(mm, mt);
 
   /* Open DMX */
   if (mm->mm_active) {
     lfe       = (linuxdvb_frontend_t*)mm->mm_active->mmi_input;
     mt->mt_fd = lfe->lfe_open_pid(lfe, mt->mt_pid, NULL);
+  } else {
+    mt->mt_fd = -1;
   }
 }
 
 static void
 linuxdvb_mux_close_table ( mpegts_mux_t *mm, mpegts_table_t *mt )
 {
-  char buf[256];
-  if (mt->mt_pid >= 0x2000)
-    return;
-  mm->mm_display_name(mm, buf, sizeof(buf));
-  tvhtrace("mpegts", "%s - closed table %s pid %04X (%d)",
-           buf, mt->mt_name, mt->mt_pid, mt->mt_pid);
-  mm->mm_table_filter[mt->mt_pid] = 0;
-  close(mt->mt_fd);
+  mpegts_mux_close_table(mm, mt);
+
+  if (mt->mt_fd != -1)
+    close(mt->mt_fd);
 }
 
 static void

src/input/mpegts/mpegts_mux.c

@@ -470,7 +470,7 @@ mpegts_mux_stop ( mpegts_mux_t *mm, void *src, int force )
   mm->mm_active = NULL;
 }
 
-static void
+void
 mpegts_mux_open_table ( mpegts_mux_t *mm, mpegts_table_t *mt )
 {
   char buf[256];
@@ -483,7 +483,7 @@ mpegts_mux_open_table ( mpegts_mux_t *mm, mpegts_table_t *mt )
   mm->mm_table_filter[mt->mt_pid] = 1;
 }
 
-static void
+void
 mpegts_mux_close_table ( mpegts_mux_t *mm, mpegts_table_t *mt )
 {
   char buf[256];