Improved PAT/PMT scanning to speed up initial tuning to encrypted channels on transponders with many PAT entries

CONTRIBUTORS

@@ -3203,3 +3203,7 @@ Eike Sauer <EikeSauer@t-online.de>
 Christian Paulick <cpaulick@xeatre.tv>
  for reporting a problem with frame detection in MPEG-2 streams that have "bottom fields"
  or varying GOP structures
+
+Mariusz Bialonczyk <manio@skyboo.net>
+ for reporting that acquiring the CA descriptors takes way too long on transponders
+ with many PAT entries, and his help in debugging this

HISTORY

@@ -7892,3 +7892,5 @@ Video Disk Recorder Revision History
 - Fixed a possible crash in the OSD demo (reported by Christopher Reimer).
 - Fixed learning keyboard remote control codes (thanks to Lars Hanisch).
 - Fixed the replay progress display for very long recordings.
+- Improved PAT/PMT scanning to speed up initial tuning to encrypted channels on
+  transponders with many PAT entries (reported by Mariusz Bialonczyk).

device.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.c 2.74.1.2 2013/08/22 10:35:30 kls Exp $
+ * $Id: device.c 2.74.1.3 2014/02/18 14:12:08 kls Exp $
  */
 
 #include "device.h"
@@ -785,6 +785,7 @@ eSetChannelResult cDevice::SetChannel(const cChannel *Channel, bool LiveView)
      if (SetChannelDevice(Channel, LiveView)) {
         // Start section handling:
         if (sectionHandler) {
+           patFilter->Trigger(Channel->Sid());
            sectionHandler->SetChannel(Channel);
            sectionHandler->SetStatus(true);
            }

pat.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: pat.c 2.19 2012/11/25 14:12:21 kls Exp $
+ * $Id: pat.c 2.19.1.1 2014/02/18 14:12:17 kls Exp $
  */
 
 #include "pat.h"
@@ -12,9 +12,8 @@
 #include "channels.h"
 #include "libsi/section.h"
 #include "libsi/descriptor.h"
-#include "thread.h"
 
-#define PMT_SCAN_TIMEOUT  10 // seconds
+#define PMT_SCAN_TIMEOUT  1000 // ms
 
 // --- cCaDescriptor ---------------------------------------------------------
 
@@ -229,94 +228,115 @@ int GetCaDescriptors(int Source, int Transponder, int ServiceId, const int *CaSy
 
 // --- cPatFilter ------------------------------------------------------------
 
+//#define DEBUG_PAT_PMT
+#ifdef DEBUG_PAT_PMT
+#define DBGLOG(a...) { cString s = cString::sprintf(a); fprintf(stderr, "%s\n", *s); dsyslog("%s", *s); }
+#else
+#define DBGLOG(a...)
+#endif
+
 cPatFilter::cPatFilter(void)
 {
-  pmtIndex = 0;
+  Trigger(0);
-  pmtPid = 0;
-  pmtSid = 0;
-  lastPmtScan = 0;
-  numPmtEntries = 0;
   Set(0x00, 0x00);  // PAT
 }
 
 void cPatFilter::SetStatus(bool On)
 {
+  cMutexLock MutexLock(&mutex);
+  DBGLOG("PAT filter set status %d", On);
   cFilter::SetStatus(On);
-  pmtIndex = 0;
+  Trigger();
-  pmtPid = 0;
-  pmtSid = 0;
-  lastPmtScan = 0;
-  numPmtEntries = 0;
 }
 
-void cPatFilter::Trigger(void)
+void cPatFilter::Trigger(int Sid)
 {
+  cMutexLock MutexLock(&mutex);
+  patVersion = -1;
+  pmtIndex = -1;
   numPmtEntries = 0;
+  if (Sid >= 0) {
+     sid = Sid;
+     DBGLOG("PAT filter trigger SID %d", Sid);
+     }
 }
 
-bool cPatFilter::PmtVersionChanged(int PmtPid, int Sid, int Version)
+bool cPatFilter::PmtVersionChanged(int PmtPid, int Sid, int Version, bool SetNewVersion)
 {
-  uint64_t v = Version;
+  int Id = MakePmtId(PmtPid, Sid);
-  v <<= 32;
-  uint64_t id = (PmtPid | (Sid << 16)) & 0x00000000FFFFFFFFLL;
   for (int i = 0; i < numPmtEntries; i++) {
-      if ((pmtVersion[i] & 0x00000000FFFFFFFFLL) == id) {
+      if (pmtId[i] == Id) {
-         bool Changed = (pmtVersion[i] & 0x000000FF00000000LL) != v;
+         if (pmtVersion[i] != Version) {
-         if (Changed)
+            if (SetNewVersion)
-            pmtVersion[i] = id | v;
+               pmtVersion[i] = Version;
-         return Changed;
+            else
+               DBGLOG("PMT %d  %2d %5d %2d -> %2d", Transponder(), i, PmtPid, pmtVersion[i], Version);
+            return true;
+            }
+         break;
          }
       }
-  if (numPmtEntries < MAXPMTENTRIES)
+  return false;
-     pmtVersion[numPmtEntries++] = id | v;
+}
-  return true;
+
+void cPatFilter::SwitchToNextPmtPid(void)
+{
+  if (pmtIndex >= 0) {
+     Del(GetPmtPid(pmtIndex), SI::TableIdPMT);
+     pmtIndex = (pmtIndex + 1) % numPmtEntries;
+     Add(GetPmtPid(pmtIndex), SI::TableIdPMT);
+     }
 }
 
 void cPatFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
 {
+  cMutexLock MutexLock(&mutex);
   if (Pid == 0x00) {
-     if (Tid == 0x00) {
+     if (Tid == SI::TableIdPAT) {
-        if (pmtPid && time(NULL) - lastPmtScan > PMT_SCAN_TIMEOUT) {
+        SI::PAT pat(Data, false);
-           Del(pmtPid, 0x02);
+        if (!pat.CheckCRCAndParse())
-           pmtPid = 0;
+           return;
-           pmtIndex++;
+        if (pat.getVersionNumber() != patVersion) {
-           lastPmtScan = time(NULL);
+           DBGLOG("PAT %d/%d %d %d -> %d", pat.getSectionNumber(), pat.getLastSectionNumber(), Transponder(), patVersion, pat.getVersionNumber());
-           }
+           if (pmtIndex >= 0) {
-        if (!pmtPid) {
+              Del(GetPmtPid(pmtIndex), SI::TableIdPMT);
-           SI::PAT pat(Data, false);
+              pmtIndex = -1;
-           if (!pat.CheckCRCAndParse())
+              }
-              return;
+           numPmtEntries = 0;
            SI::PAT::Association assoc;
-           int Index = 0;
            for (SI::Loop::Iterator it; pat.associationLoop.getNext(assoc, it); ) {
-               if (!assoc.isNITPid()) {
+               if (!assoc.isNITPid() && numPmtEntries < MAXPMTENTRIES) {
-                  if (Index++ >= pmtIndex && Channels.GetByServiceID(Source(), Transponder(), assoc.getServiceId())) {
+                  DBGLOG("    PMT pid %2d %5d  SID %5d", numPmtEntries, assoc.getPid(), assoc.getServiceId());
-                     pmtPid = assoc.getPid();
+                  pmtId[numPmtEntries] = MakePmtId(assoc.getPid(), assoc.getServiceId());
-                     pmtSid = assoc.getServiceId();
+                  pmtVersion[numPmtEntries] = -1;
-                     Add(pmtPid, 0x02);
+                  if (sid == assoc.getServiceId()) {
-                     break;
+                     pmtIndex = numPmtEntries;
+                     DBGLOG("sid = %d pmtIndex = %d", sid, pmtIndex);
                      }
+                  numPmtEntries++;
                   }
                }
-           if (!pmtPid)
+           if (numPmtEntries > 0 && pmtIndex < 0)
               pmtIndex = 0;
+           Add(GetPmtPid(pmtIndex), SI::TableIdPMT);
+           patVersion = pat.getVersionNumber();
+           timer.Set(PMT_SCAN_TIMEOUT);
            }
         }
      }
-  else if (Pid == pmtPid && Tid == SI::TableIdPMT && Source() && Transponder()) {
+  else if (Tid == SI::TableIdPMT && Source() && Transponder()) {
+     timer.Set(PMT_SCAN_TIMEOUT);
      SI::PMT pmt(Data, false);
      if (!pmt.CheckCRCAndParse())
         return;
-     if (pmt.getServiceId() != pmtSid)
+     if (!PmtVersionChanged(Pid, pmt.getTableIdExtension(), pmt.getVersionNumber())) {
-        return; // skip broken PMT records
+        SwitchToNextPmtPid();
-     if (!PmtVersionChanged(pmtPid, pmt.getTableIdExtension(), pmt.getVersionNumber())) {
-        lastPmtScan = 0; // this triggers the next scan
         return;
         }
-     if (!Channels.Lock(true, 10)) {
+     if (!Channels.Lock(true, 10))
-        numPmtEntries = 0; // to make sure we try again
         return;
-        }
+     PmtVersionChanged(Pid, pmt.getTableIdExtension(), pmt.getVersionNumber(), true);
+     SwitchToNextPmtPid();
      cChannel *Channel = Channels.GetByServiceID(Source(), Transponder(), pmt.getServiceId());
      if (Channel) {
         SI::CaDescriptor *d;
@@ -552,7 +572,12 @@ void cPatFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
            }
         Channel->SetCaDescriptors(CaDescriptorHandler.AddCaDescriptors(CaDescriptors));
         }
-     lastPmtScan = 0; // this triggers the next scan
      Channels.Unlock();
      }
+  if (timer.TimedOut()) {
+     if (pmtIndex >= 0)
+        DBGLOG("PMT timeout %d", pmtIndex);
+     SwitchToNextPmtPid();
+     timer.Set(PMT_SCAN_TIMEOUT);
+     }
 }

pat.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: pat.h 2.3 2013/02/16 15:20:24 kls Exp $
+ * $Id: pat.h 2.3.1.1 2014/02/18 14:12:24 kls Exp $
  */
 
 #ifndef __PAT_H
@@ -12,24 +12,30 @@
 
 #include <stdint.h>
 #include "filter.h"
+#include "thread.h"
 
 #define MAXPMTENTRIES 64
 
 class cPatFilter : public cFilter {
 private:
-  time_t lastPmtScan;
+  cMutex mutex;
+  cTimeMs timer;
+  int patVersion;
   int pmtIndex;
-  int pmtPid;
+  int pmtId[MAXPMTENTRIES];
-  int pmtSid;
+  int pmtVersion[MAXPMTENTRIES];
-  uint64_t pmtVersion[MAXPMTENTRIES];
   int numPmtEntries;
-  bool PmtVersionChanged(int PmtPid, int Sid, int Version);
+  int sid;
+  int GetPmtPid(int Index) { return pmtId[Index] & 0x0000FFFF; }
+  int MakePmtId(int PmtPid, int Sid) { return PmtPid | (Sid << 16); }
+  bool PmtVersionChanged(int PmtPid, int Sid, int Version, bool SetNewVersion = false);
+  void SwitchToNextPmtPid(void);
 protected:
   virtual void Process(u_short Pid, u_char Tid, const u_char *Data, int Length);
 public:
   cPatFilter(void);
   virtual void SetStatus(bool On);
-  void Trigger(void);
+  void Trigger(int Sid = -1);
   };
 
 int GetCaDescriptors(int Source, int Transponder, int ServiceId, const int *CaSystemIds, int BufSize, uchar *Data, int EsPid);

sdt.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: sdt.c 2.5 2010/05/16 14:23:21 kls Exp $
+ * $Id: sdt.c 2.5.1.1 2014/02/18 14:12:33 kls Exp $
  */
 
 #include "sdt.h"
@@ -92,7 +92,7 @@ void cSdtFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
                            }
                         else if (*pn && Setup.UpdateChannels >= 4) {
                            channel = Channels.NewChannel(Channel(), pn, ps, pp, sdt.getOriginalNetworkId(), sdt.getTransportStreamId(), SiSdtService.getServiceId());
-                           patFilter->Trigger();
+                           patFilter->Trigger(SiSdtService.getServiceId());
                            }
                         }
                    default: ;
@@ -118,7 +118,7 @@ void cSdtFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
                      cChannel *link = Channels.GetByChannelID(tChannelID(Source(), Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId()));
                      if (!link && Setup.UpdateChannels >= 4) {
                         link = Channels.NewChannel(Channel(), "NVOD", "", "", Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId());
-                        patFilter->Trigger();
+                        patFilter->Trigger(Service.getServiceId());
                         }
                      if (link) {
                         if (!LinkChannels)