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vdr/pat.c
Klaus Schmidinger ac13b6e161 Fixed a possible crash with inconsistent SI data
2004-10-16 10:14:19 +02:00

414 lines
14 KiB
C
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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 1.10 2004/10/16 10:01:12 kls Exp $
*/
#include "pat.h"
#include <malloc.h>
#include "channels.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
#include "thread.h"
#define PMT_SCAN_TIMEOUT 10 // seconds
// --- cCaDescriptor ---------------------------------------------------------
class cCaDescriptor : public cListObject {
private:
int caSystem;
bool stream;
int length;
uchar *data;
public:
cCaDescriptor(int CaSystem, int CaPid, bool Stream, int Length, const uchar *Data);
virtual ~cCaDescriptor();
bool operator== (const cCaDescriptor &arg) const;
int CaSystem(void) { return caSystem; }
int Stream(void) { return stream; }
int Length(void) const { return length; }
const uchar *Data(void) const { return data; }
};
cCaDescriptor::cCaDescriptor(int CaSystem, int CaPid, bool Stream, int Length, const uchar *Data)
{
caSystem = CaSystem;
stream = Stream;
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);
}
cCaDescriptor::~cCaDescriptor()
{
free(data);
}
bool cCaDescriptor::operator== (const cCaDescriptor &arg) const
{
return length == arg.length && memcmp(data, arg.data, length) == 0;
}
// --- cCaDescriptors --------------------------------------------------------
class cCaDescriptors : public cListObject {
private:
int source;
int transponder;
int serviceId;
int numCaIds;
int caIds[MAXCAIDS + 1];
cList<cCaDescriptor> caDescriptors;
void AddCaId(int CaId);
public:
cCaDescriptors(int Source, int Transponder, int ServiceId);
bool operator== (const cCaDescriptors &arg) const;
bool Is(int Source, int Transponder, int ServiceId);
bool Is(cCaDescriptors * CaDescriptors);
bool Empty(void) { return caDescriptors.Count() == 0; }
void AddCaDescriptor(SI::CaDescriptor *d, bool Stream);
int GetCaDescriptors(const unsigned short *CaSystemIds, int BufSize, uchar *Data, bool &StreamFlag);
const int *CaIds(void) { return caIds; }
};
cCaDescriptors::cCaDescriptors(int Source, int Transponder, int ServiceId)
{
source = Source;
transponder = Transponder;
serviceId = ServiceId;
numCaIds = 0;
caIds[0] = 0;
}
bool cCaDescriptors::operator== (const cCaDescriptors &arg) const
{
cCaDescriptor *ca1 = caDescriptors.First();
cCaDescriptor *ca2 = arg.caDescriptors.First();
while (ca1 && ca2) {
if (!(*ca1 == *ca2))
return false;
ca1 = caDescriptors.Next(ca1);
ca2 = arg.caDescriptors.Next(ca2);
}
return !ca1 && !ca2;
}
bool cCaDescriptors::Is(int Source, int Transponder, int ServiceId)
{
return source == Source && transponder == Transponder && serviceId == ServiceId;
}
bool cCaDescriptors::Is(cCaDescriptors *CaDescriptors)
{
return Is(CaDescriptors->source, CaDescriptors->transponder, CaDescriptors->serviceId);
}
void cCaDescriptors::AddCaId(int CaId)
{
if (numCaIds < MAXCAIDS) {
for (int i = 0; i < numCaIds; i++) {
if (caIds[i] == CaId)
return;
}
caIds[numCaIds++] = CaId;
caIds[numCaIds] = 0;
}
}
void cCaDescriptors::AddCaDescriptor(SI::CaDescriptor *d, bool Stream)
{
cCaDescriptor *nca = new cCaDescriptor(d->getCaType(), d->getCaPid(), Stream, d->privateData.getLength(), d->privateData.getData());
for (cCaDescriptor *ca = caDescriptors.First(); ca; ca = caDescriptors.Next(ca)) {
if (*ca == *nca) {
delete nca;
return;
}
}
AddCaId(nca->CaSystem());
caDescriptors.Add(nca);
//#define DEBUG_CA_DESCRIPTORS 1
#ifdef DEBUG_CA_DESCRIPTORS
char buffer[1024];
char *q = buffer;
q += sprintf(q, "CAM: %04X %5d %5d %04X %d -", source, transponder, serviceId, d->getCaType(), Stream);
for (int i = 0; i < nca->Length(); i++)
q += sprintf(q, " %02X", nca->Data()[i]);
dsyslog(buffer);
#endif
}
int cCaDescriptors::GetCaDescriptors(const unsigned short *CaSystemIds, int BufSize, uchar *Data, bool &StreamFlag)
{
if (!CaSystemIds || !*CaSystemIds)
return 0;
if (BufSize > 0 && Data) {
int length = 0;
int IsStream = -1;
for (cCaDescriptor *d = caDescriptors.First(); d; d = caDescriptors.Next(d)) {
const unsigned short *caids = CaSystemIds;
do {
if (d->CaSystem() == *caids) {
if (length + d->Length() <= BufSize) {
if (IsStream >= 0 && IsStream != d->Stream())
dsyslog("CAM: different stream flag in CA descriptors");
IsStream = d->Stream();
memcpy(Data + length, d->Data(), d->Length());
length += d->Length();
}
else
return -1;
}
} while (*++caids);
}
StreamFlag = IsStream == 1;
return length;
}
return -1;
}
// --- cCaDescriptorHandler --------------------------------------------------
class cCaDescriptorHandler : public cList<cCaDescriptors> {
private:
cMutex mutex;
public:
int AddCaDescriptors(cCaDescriptors *CaDescriptors);
// Returns 0 if this is an already known descriptor,
// 1 if it is an all new descriptor with actual contents,
// and 2 if an existing descriptor was changed.
int GetCaDescriptors(int Source, int Transponder, int ServiceId, const unsigned short *CaSystemIds, int BufSize, uchar *Data, bool &StreamFlag);
};
int cCaDescriptorHandler::AddCaDescriptors(cCaDescriptors *CaDescriptors)
{
cMutexLock MutexLock(&mutex);
for (cCaDescriptors *ca = First(); ca; ca = Next(ca)) {
if (ca->Is(CaDescriptors)) {
if (*ca == *CaDescriptors) {
delete CaDescriptors;
return 0;
}
Del(ca);
Add(CaDescriptors);
return 2;
}
}
Add(CaDescriptors);
return CaDescriptors->Empty() ? 0 : 1;
}
int cCaDescriptorHandler::GetCaDescriptors(int Source, int Transponder, int ServiceId, const unsigned short *CaSystemIds, int BufSize, uchar *Data, bool &StreamFlag)
{
cMutexLock MutexLock(&mutex);
StreamFlag = false;
for (cCaDescriptors *ca = First(); ca; ca = Next(ca)) {
if (ca->Is(Source, Transponder, ServiceId))
return ca->GetCaDescriptors(CaSystemIds, BufSize, Data, StreamFlag);
}
return 0;
}
cCaDescriptorHandler CaDescriptorHandler;
int GetCaDescriptors(int Source, int Transponder, int ServiceId, const unsigned short *CaSystemIds, int BufSize, uchar *Data, bool &StreamFlag)
{
return CaDescriptorHandler.GetCaDescriptors(Source, Transponder, ServiceId, CaSystemIds, BufSize, Data, StreamFlag);
}
// --- cPatFilter ------------------------------------------------------------
cPatFilter::cPatFilter(void)
{
pmtIndex = 0;
pmtPid = 0;
lastPmtScan = 0;
numPmtEntries = 0;
Set(0x00, 0x00); // PAT
}
void cPatFilter::SetStatus(bool On)
{
cFilter::SetStatus(On);
pmtIndex = 0;
pmtPid = 0;
lastPmtScan = 0;
numPmtEntries = 0;
}
void cPatFilter::Trigger(void)
{
numPmtEntries = 0;
}
bool cPatFilter::PmtVersionChanged(int PmtPid, int Sid, int Version)
{
uint64_t v = Version;
v <<= 32;
uint64_t id = (PmtPid | (Sid << 16)) & 0x00000000FFFFFFFFLL;
for (int i = 0; i < numPmtEntries; i++) {
if ((pmtVersion[i] & 0x00000000FFFFFFFFLL) == id) {
bool Changed = (pmtVersion[i] & 0x000000FF00000000LL) != v;
if (Changed)
pmtVersion[i] = id | v;
return Changed;
}
}
if (numPmtEntries < MAXPMTENTRIES)
pmtVersion[numPmtEntries++] = id | v;
return true;
}
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.getNext(assoc, 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;
if (!PmtVersionChanged(pmtPid, pmt.getTableIdExtension(), pmt.getVersionNumber())) {
lastPmtScan = 0; // this triggers the next scan
return;
}
if (!Channels.Lock(true, 10)) {
numPmtEntries = 0; // to make sure we try again
return;
}
cChannel *Channel = Channels.GetByServiceID(Source(), Transponder(), pmt.getServiceId());
if (Channel) {
SI::CaDescriptor *d;
cCaDescriptors *CaDescriptors = new cCaDescriptors(Channel->Source(), Channel->Transponder(), Channel->Sid());
// Scan the common loop:
for (SI::Loop::Iterator it; (d = (SI::CaDescriptor*)pmt.commonDescriptors.getNext(it, SI::CaDescriptorTag)); ) {
CaDescriptors->AddCaDescriptor(d, false);
delete d;
}
// Scan the stream-specific loop:
SI::PMT::Stream stream;
int Vpid = 0;
int Ppid = pmt.getPCRPid();
int Apids[MAXAPIDS] = { 0 };
int Dpids[MAXAPIDS] = { 0 };
char ALangs[MAXAPIDS][4] = { "" };
char DLangs[MAXAPIDS][4] = { "" };
int Tpid = 0;
int NumApids = 0;
int NumDpids = 0;
for (SI::Loop::Iterator it; pmt.streamLoop.getNext(stream, it); ) {
switch (stream.getStreamType()) {
case 1: // STREAMTYPE_11172_VIDEO
case 2: // STREAMTYPE_13818_VIDEO
Vpid = stream.getPid();
break;
case 3: // STREAMTYPE_11172_AUDIO
case 4: // STREAMTYPE_13818_AUDIO
{
if (NumApids < MAXAPIDS) {
Apids[NumApids] = stream.getPid();
SI::Descriptor *d;
for (SI::Loop::Iterator it; (d = stream.streamDescriptors.getNext(it)); ) {
switch (d->getDescriptorTag()) {
case SI::ISO639LanguageDescriptorTag: {
SI::ISO639LanguageDescriptor *ld = (SI::ISO639LanguageDescriptor *)d;
if (*ld->languageCode != '-') { // some use "---" to indicate "none"
strn0cpy(ALangs[NumApids], I18nNormalizeLanguageCode(ld->languageCode), 4);
ALangs[NumApids][4] = 0;
}
}
break;
default: ;
}
delete d;
}
NumApids++;
}
}
break;
case 5: // STREAMTYPE_13818_PRIVATE
case 6: // STREAMTYPE_13818_PES_PRIVATE
//XXX case 8: // STREAMTYPE_13818_DSMCC
{
int dpid = 0;
char lang[4] = { 0 };
SI::Descriptor *d;
for (SI::Loop::Iterator it; (d = stream.streamDescriptors.getNext(it)); ) {
switch (d->getDescriptorTag()) {
case SI::AC3DescriptorTag:
dpid = stream.getPid();
break;
case SI::TeletextDescriptorTag:
Tpid = stream.getPid();
break;
case SI::ISO639LanguageDescriptorTag: {
SI::ISO639LanguageDescriptor *ld = (SI::ISO639LanguageDescriptor *)d;
strn0cpy(lang, I18nNormalizeLanguageCode(ld->languageCode), 4);
}
break;
default: ;
}
delete d;
}
if (dpid) {
if (NumDpids < MAXAPIDS) {
Dpids[NumDpids] = dpid;
strn0cpy(DLangs[NumDpids], lang, 4);
NumDpids++;
}
}
}
break;
//default: printf("PID: %5d %5d %2d %3d %3d\n", pmt.getServiceId(), stream.getPid(), stream.getStreamType(), pmt.getVersionNumber(), Channel->Number());//XXX
}
for (SI::Loop::Iterator it; (d = (SI::CaDescriptor*)stream.streamDescriptors.getNext(it, SI::CaDescriptorTag)); ) {
CaDescriptors->AddCaDescriptor(d, true);
delete d;
}
}
if (Setup.UpdateChannels >= 2) {
Channel->SetPids(Vpid, Vpid ? Ppid : 0, Apids, ALangs, Dpids, DLangs, Tpid);
Channel->SetCaIds(CaDescriptors->CaIds());
}
Channel->SetCaDescriptors(CaDescriptorHandler.AddCaDescriptors(CaDescriptors));
}
lastPmtScan = 0; // this triggers the next scan
Channels.Unlock();
}
}
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