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/*
* pat.c: PAT section filter
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: pat.c 1.1 2003/12/21 15:28:28 kls Exp $
*/
#include "pat.h"
#include <malloc.h>
#include "libsi/section.h"
#include "libsi/descriptor.h"
#define PMT_SCAN_TIMEOUT 10 // seconds
// --- cCaDescriptor ---------------------------------------------------------
class cCaDescriptor : public cListObject {
friend class cCaDescriptors;
private:
int source;
int transponder;
int serviceId;
int caSystem;
int providerId;
int caPid;
int length;
uchar *data;
public:
cCaDescriptor(int Source, int Transponder, int ServiceId, int CaSystem, int ProviderId, int CaPid, int Length, const uchar *Data);
virtual ~cCaDescriptor();
int Length(void) const { return length; }
const uchar *Data(void) const { return data; }
};
cCaDescriptor::cCaDescriptor(int Source, int Transponder, int ServiceId, int CaSystem, int ProviderId, int CaPid, int Length, const uchar *Data)
{
source = Source;
transponder = Transponder;
serviceId = ServiceId;
caSystem = CaSystem;
providerId = ProviderId;
caPid = CaPid;
length = Length + 6;
data = MALLOC(uchar, length);
data[0] = SI::CaDescriptorTag;
data[1] = length - 2;
data[2] = (caSystem >> 8) & 0xFF;
data[3] = caSystem & 0xFF;
data[4] = ((CaPid >> 8) & 0x1F) | 0xE0;
data[5] = CaPid & 0xFF;
if (Length)
memcpy(&data[6], Data, Length);
//#define DEBUG_CA_DESCRIPTORS 1
#ifdef DEBUG_CA_DESCRIPTORS
char buffer[1024];
char *q = buffer;
q += sprintf(q, "CAM: %04X %5d %5d %04X %6X %04X -", source, transponder, serviceId, caSystem, providerId, caPid);
for (int i = 0; i < length; i++)
q += sprintf(q, " %02X", data[i]);
dsyslog(buffer);
#endif
}
cCaDescriptor::~cCaDescriptor()
{
free(data);
}
// --- cCaDescriptors --------------------------------------------------------
class cCaDescriptors : public cList<cCaDescriptor> {
private:
cMutex mutex;
public:
void NewCaDescriptor(int Source, int Transponder, int ServiceId, SI::CaDescriptor *d);
int GetCaDescriptors(int Source, int Transponder, int ServiceId, const unsigned short *CaSystemIds, int BufSize, uchar *Data);
};
void cCaDescriptors::NewCaDescriptor(int Source, int Transponder, int ServiceId, SI::CaDescriptor *d)
{
// The code for determining the ProviderID was taken from 'libdtv'
// written by Rolf Hakenes <hakenes@hippomi.de>.
const uchar *Data = d->privateData.getData();
int Length = d->privateData.getLength();
int ProviderID = 0;
switch (d->getCaType() >> 8) {
case 0x01: // SECA
ProviderID = (Data[0] << 8) | Data[1];
break;
case 0x05: // Viaccess ? (France Telecom)
for (int i = 0; i < Length; i++) {
if (Data[i] == 0x14 && Data[i + 1] == 0x03) {
ProviderID = (Data[i + 2] << 16) |
(Data[i + 3] << 8) |
(Data[i + 4] & 0xf0);
break;
}
}
break;
}
cMutexLock MutexLock(&mutex);
for (cCaDescriptor *ca = First(); ca; ca = Next(ca)) {
if (ca->source == Source && ca->transponder == Transponder && ca->serviceId == ServiceId && ca->caSystem == d->getCaType() && ca->providerId == ProviderID && ca->caPid == d->getCaPid())
return;
}
Add(new cCaDescriptor(Source, Transponder, ServiceId, d->getCaType(), ProviderID, d->getCaPid(), Length, Data));
//XXX update???
}
int cCaDescriptors::GetCaDescriptors(int Source, int Transponder, int ServiceId, const unsigned short *CaSystemIds, int BufSize, uchar *Data)
{
if (!CaSystemIds || !*CaSystemIds)
return 0;
if (BufSize > 0 && Data) {
cMutexLock MutexLock(&mutex);
int length = 0;
for (cCaDescriptor *d = First(); d; d = Next(d)) {
if (d->source == Source && d->transponder == Transponder && d->serviceId == ServiceId) {
const unsigned short *caids = CaSystemIds;
do {
if (d->caSystem == *caids) {
if (length + d->Length() <= BufSize) {
memcpy(Data + length, d->Data(), d->Length());
length += d->Length();
}
else
return -1;
}
} while (*++caids);
}
}
return length;
}
return -1;
}
cCaDescriptors CaDescriptors;
int GetCaDescriptors(int Source, int Transponder, int ServiceId, const unsigned short *CaSystemIds, int BufSize, uchar *Data)
{
return CaDescriptors.GetCaDescriptors(Source, Transponder, ServiceId, CaSystemIds, BufSize, Data);
}
// --- cPatFilter ------------------------------------------------------------
cPatFilter::cPatFilter(void)
{
pmtIndex = 0;
pmtPid = 0;
lastPmtScan = 0;
Set(0x00, 0x00); // PAT
}
void cPatFilter::SetStatus(bool On)
{
cFilter::SetStatus(On);
pmtIndex = 0;
pmtPid = 0;
lastPmtScan = 0;
}
void cPatFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
{
if (Pid == 0x00) {
if (Tid == 0x00) {
if (pmtPid && time(NULL) - lastPmtScan > PMT_SCAN_TIMEOUT) {
Del(pmtPid, 0x02);
pmtPid = 0;
pmtIndex++;
lastPmtScan = time(NULL);
}
if (!pmtPid) {
SI::PAT pat(Data, false);
if (!pat.CheckCRCAndParse())
return;
SI::PAT::Association assoc;
int Index = 0;
for (SI::Loop::Iterator it; pat.associationLoop.hasNext(it); ) {
assoc = pat.associationLoop.getNext(it);
if (!assoc.isNITPid()) {
if (Index++ == pmtIndex) {
pmtPid = assoc.getPid();
Add(pmtPid, 0x02);
break;
}
}
}
if (!pmtPid)
pmtIndex = 0;
}
}
}
else if (Pid == pmtPid && Tid == SI::TableIdPMT && Source() && Transponder()) {
SI::PMT pmt(Data, false);
if (!pmt.CheckCRCAndParse())
return;
SI::CaDescriptor *d;
// Scan the common loop:
for (SI::Loop::Iterator it; (d = (SI::CaDescriptor*)pmt.commonDescriptors.getNext(it, SI::CaDescriptorTag)); ) {
CaDescriptors.NewCaDescriptor(Source(), Transponder(), pmt.getServiceId(), d);
delete d;
}
// Scan the stream-specific loop:
SI::PMT::Stream stream;
for (SI::Loop::Iterator it; pmt.streamLoop.hasNext(it); ) {
stream = pmt.streamLoop.getNext(it);
for (SI::Loop::Iterator it; (d = (SI::CaDescriptor*)stream.streamDescriptors.getNext(it, SI::CaDescriptorTag)); ) {
CaDescriptors.NewCaDescriptor(Source(), Transponder(), pmt.getServiceId(), d);
delete d;
}
}
lastPmtScan = 0; // this triggers the next scan
}
}
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