Implemented automatic PID switching and channel detection

1 files changed, 146 insertions, 0 deletions

diff --git a/sdt.c b/sdt.c
new file mode 100644
index 00000000..a4e91b80
--- /dev/null
+++ b/sdt.c
@@ -0,0 +1,146 @@
+/*
+ * sdt.c: SDT section filter
+ *
+ * See the main source file 'vdr.c' for copyright information and
+ * how to reach the author.
+ *
+ * $Id: sdt.c 1.1 2004/01/04 11:54:42 kls Exp $
+ */
+
+#include "sdt.h"
+#include "channels.h"
+#include "libsi/section.h"
+#include "libsi/descriptor.h"
+
+// --- cSDT ------------------------------------------------------------------
+
+class cSDT : public SI::SDT {
+public:
+  cSDT(int Source, int Transponder, uchar &lastSdtVersion, cPatFilter *PatFilter, const u_char *Data);
+  };
+
+cSDT::cSDT(int Source, int Transponder, uchar &lastSdtVersion, cPatFilter *PatFilter, const u_char *Data)
+:SI::SDT(Data, false)
+{
+  if (!CheckCRCAndParse())
+     return;
+
+  if (getVersionNumber() == lastSdtVersion)
+     return;
+
+  if (!Channels.Lock(true, 10))
+     return;
+
+  lastSdtVersion = getVersionNumber();
+
+  SI::SDT::Service SiSdtService;
+  for (SI::Loop::Iterator it; serviceLoop.hasNext(it); ) {
+      SiSdtService = serviceLoop.getNext(it);
+
+      cChannel *Channel = Channels.GetByChannelID(tChannelID(Source, getOriginalNetworkId(), getTransportStreamId(), SiSdtService.getServiceId()));
+      if (!Channel)
+         Channel = Channels.GetByChannelID(tChannelID(Source, 0, Transponder, SiSdtService.getServiceId()));
+
+      SI::Descriptor *d;
+      for (SI::Loop::Iterator it2; (d = SiSdtService.serviceDescriptors.getNext(it2)); ) {
+          switch (d->getDescriptorTag()) {
+            case SI::ServiceDescriptorTag: {
+                 SI::ServiceDescriptor *sd = (SI::ServiceDescriptor *)d;
+                 switch (sd->getServiceType()) {
+                   case 0x01: // digital television service
+                   //XXX TODO case 0x02: // digital radio sound service
+                   //XXX TODO case 0x04: // NVOD reference service
+                   //XXX TODO case 0x05: // NVOD time-shifted service
+                        {
+                        char buffer[1024];
+                        char *p = sd->serviceName.getText(buffer);
+                        char NameBuf[1024];
+                        char ShortNameBuf[1024];
+                        char *pn = NameBuf;
+                        char *ps = ShortNameBuf;
+                        int IsShortName = 0;
+                        while (*p) {
+                              if ((uchar)*p == 0x86)
+                                 IsShortName++;
+                              else if ((uchar)*p == 0x87)
+                                 IsShortName--;
+                              else {
+                                 *pn++ = *p;
+                                 if (IsShortName)
+                                    *ps++ = *p;
+                                 }
+                              p++;
+                              }
+                        *pn = *ps = 0;
+                        pn = NameBuf;
+                        if (*NameBuf && *ShortNameBuf) {
+                           *ps++ = ',';
+                           strcpy(ps, NameBuf);
+                           pn = ShortNameBuf;
+                           }
+                        if (Channel) {
+                           Channel->SetId(getOriginalNetworkId(), getTransportStreamId(), SiSdtService.getServiceId());
+                           Channel->SetName(pn);
+                           // Using SiSdtService.getFreeCaMode() is no good, because some
+                           // tv stations set this flag even for non-encrypted channels :-(
+                           // The special value 0xFFFF was supposed to mean "unknown encryption"
+                           // and would have been overwritten with real CA values later:
+                           // Channel->SetCa(SiSdtService.getFreeCaMode() ? 0xFFFF : 0);
+                           }
+                        else if (*pn) {
+                           Channel = Channels.NewChannel(Source, Transponder, pn, getOriginalNetworkId(), getTransportStreamId(), SiSdtService.getServiceId());
+                           PatFilter->Trigger();
+                           }
+                        }
+                   }
+                 }
+                 break;
+            // Using the CaIdentifierDescriptor is no good, because some tv stations
+            // just don't use it. The actual CA values are collected in pat.c:
+            /*
+            case SI::CaIdentifierDescriptorTag: {
+                 SI::CaIdentifierDescriptor *cid = (SI::CaIdentifierDescriptor *)d;
+                 if (Channel) {
+                    for (SI::Loop::Iterator it; cid->identifiers.hasNext(it); )
+                        Channel->SetCa(cid->identifiers.getNext(it));
+                    }
+                 }
+                 break;
+            */
+            case SI::NVODReferenceDescriptorTag: {
+                 SI::NVODReferenceDescriptor *nrd = (SI::NVODReferenceDescriptor *)d;
+                 for (SI::Loop::Iterator it; nrd->serviceLoop.hasNext(it); ) {
+                     SI::NVODReferenceDescriptor::Service Service = nrd->serviceLoop.getNext(it);
+                     //printf(" %04X-%04X-%04X\n", Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId());//XXX TODO
+                     }
+                 }
+                 break;
+            default: ;
+            }
+          delete d;
+          }
+      }
+  Channels.Unlock();
+}
+
+
+// --- cSdtFilter ------------------------------------------------------------
+
+cSdtFilter::cSdtFilter(cPatFilter *PatFilter)
+{
+  lastSdtVersion = 0xFF;
+  patFilter = PatFilter;
+  Set(0x11, 0x42);  // SDT
+}
+
+void cSdtFilter::SetStatus(bool On)
+{
+  cFilter::SetStatus(On);
+  lastSdtVersion = 0xFF;
+}
+
+void cSdtFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
+{
+  if (Source() && Transponder())
+     cSDT SDT(Source(), Transponder(), lastSdtVersion, patFilter, Data);
+}