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Now only processing NITs that contain the transponder they are actually broadcast on

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This commit is contained in:
Klaus Schmidinger 2004-01-18 16:31:58 +01:00
parent 5651c5542f
commit 833a89289b
3 changed files with 96 additions and 3 deletions
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2
HISTORY
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@ -2606,3 +2606,5 @@ Video Disk Recorder Revision History
and satellite transponders.
- Added 'libsi' include files to the 'include' directory, so that plugins can
use them (thanks to Marcel Wiesweg).
- Now only processing NITs that contain the transponder they are actually
broadcast on.

81
nit.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: nit.c 1.3 2004/01/18 10:09:47 kls Exp $
* $Id: nit.c 1.4 2004/01/18 16:31:08 kls Exp $
*/
#include "nit.h"
@ -17,12 +17,16 @@
cNitFilter::cNitFilter(void)
{
numNits = 0;
networkId = 0;
Set(0x10, 0x40); // NIT
}
void cNitFilter::SetStatus(bool On)
{
cFilter::SetStatus(On);
numNits = 0;
networkId = 0;
sectionSyncer.Reset();
}
@ -31,7 +35,59 @@ void cNitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
SI::NIT nit(Data, false);
if (!nit.CheckCRCAndParse())
return;
if (!sectionSyncer.Sync(nit.getVersionNumber(), nit.getSectionNumber(), nit.getLastSectionNumber()))
// Some broadcasters send more than one NIT, with no apparent way of telling which
// one is the right one to use. This is an attempt to find the NIT that contains
// the transponder it was transmitted on and use only that one:
int ThisNIT = -1;
if (!networkId) {
for (int i = 0; i < numNits; i++) {
if (nits[i].networkId == nit.getNetworkId()) {
if (nit.getSectionNumber() == 0) {
// all NITs have passed by
for (int j = 0; j < numNits; j++) {
if (nits[j].hasTransponder) {
networkId = nits[j].networkId;
//printf("taking NIT with network ID %d\n", networkId);
//XXX what if more than one NIT contaisn this transponder???
break;
}
}
if (!networkId) {
//printf("none of the NITs contains transponder %d\n", Transponder());
return;
}
}
else {
ThisNIT = i;
break;
}
}
}
if (!networkId && ThisNIT < 0 && numNits < MAXNITS) {
if (nit.getSectionNumber() == 0) {
*nits[numNits].name = 0;
SI::Descriptor *d;
for (SI::Loop::Iterator it; (d = nit.commonDescriptors.getNext(it)); ) {
switch (d->getDescriptorTag()) {
case SI::NetworkNameDescriptorTag: {
SI::NetworkNameDescriptor *nnd = (SI::NetworkNameDescriptor *)d;
nnd->name.getText(nits[numNits].name);
}
break;
default: ;
}
}
nits[numNits].networkId = nit.getNetworkId();
nits[numNits].hasTransponder = false;
//printf("NIT[%d] %5d '%s'\n", numNits, nits[numNits].networkId, nits[numNits].name);
ThisNIT = numNits;
numNits++;
}
}
}
else if (networkId != nit.getNetworkId())
return; // ignore all other NITs
else if (!sectionSyncer.Sync(nit.getVersionNumber(), nit.getSectionNumber(), nit.getLastSectionNumber()))
return;
if (!Channels.Lock(true, 10))
return;
@ -49,6 +105,13 @@ void cNitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
static int CodeRates[] = { FEC_NONE, FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_NONE };
int CodeRate = CodeRates[sd->getFecInner()];
int SymbolRate = BCD2INT(sd->getSymbolRate()) / 10;
if (ThisNIT >= 0) {
if (ISTRANSPONDER(Frequency, Transponder())) {
nits[ThisNIT].hasTransponder = true;
//printf("has transponder %d\n", Transponder());
}
break;
}
bool found = false;
for (cChannel *Channel = Channels.First(); Channel; Channel = Channels.Next(Channel)) {
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
@ -77,6 +140,13 @@ void cNitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
static int Modulations[] = { QPSK, QAM_16, QAM_32, QAM_64, QAM_128, QAM_256, QAM_AUTO };
int Modulation = Modulations[min(sd->getModulation(), 6)];
int SymbolRate = BCD2INT(sd->getSymbolRate()) / 10;
if (ThisNIT >= 0) {
if (ISTRANSPONDER(Frequency / 1000, Transponder())) {
nits[ThisNIT].hasTransponder = true;
//printf("has transponder %d\n", Transponder());
}
break;
}
bool found = false;
for (cChannel *Channel = Channels.First(); Channel; Channel = Channels.Next(Channel)) {
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
@ -112,6 +182,13 @@ void cNitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
int GuardInterval = GuardIntervals[sd->getGuardInterval()];
static int TransmissionModes[] = { TRANSMISSION_MODE_2K, TRANSMISSION_MODE_8K, TRANSMISSION_MODE_AUTO, TRANSMISSION_MODE_AUTO };
int TransmissionMode = TransmissionModes[sd->getTransmissionMode()];
if (ThisNIT >= 0) {
if (ISTRANSPONDER(Frequency / 1000000, Transponder())) {
nits[ThisNIT].hasTransponder = true;
//printf("has transponder %d\n", Transponder());
}
break;
}
bool found = false;
for (cChannel *Channel = Channels.First(); Channel; Channel = Channels.Next(Channel)) {
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {

16
nit.h
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: nit.h 1.1 2004/01/11 14:31:05 kls Exp $
* $Id: nit.h 1.2 2004/01/18 16:31:08 kls Exp $
*/
#ifndef __NIT_H
@ -12,9 +12,23 @@
#include "filter.h"
#define MAXNITS 16
#define MAXNETWORKNAME 256
class cNitFilter : public cFilter {
private:
class cNit {
public:
u_short networkId;
char name[MAXNETWORKNAME];
bool hasTransponder;
};
cSectionSyncer sectionSyncer;
cNit nits[MAXNITS];
u_short networkId;
int numNits;
protected:
virtual void Process(u_short Pid, u_char Tid, const u_char *Data, int Length);
public: