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/*
* sections.c: Section data handling
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: sections.c 5.2 2021/06/20 10:27:19 kls Exp $
*/
#include "sections.h"
#include <unistd.h>
#include "channels.h"
#include "device.h"
#include "thread.h"
// --- cFilterHandle----------------------------------------------------------
class cFilterHandle : public cListObject {
public:
cFilterData filterData;
int handle;
int used;
cFilterHandle(const cFilterData &FilterData);
};
cFilterHandle::cFilterHandle(const cFilterData &FilterData)
{
filterData = FilterData;
handle = -1;
used = 0;
}
// --- cSectionHandlerPrivate ------------------------------------------------
class cSectionHandlerPrivate {
public:
cChannel channel;
};
// --- cSectionHandler -------------------------------------------------------
cSectionHandler::cSectionHandler(cDevice *Device)
:cThread(NULL, true)
{
shp = new cSectionHandlerPrivate;
device = Device;
SetDescription("device %d section handler", device->DeviceNumber() + 1);
statusCount = 0;
on = false;
waitForLock = false;
flush = false;
startFilters = false;
Start();
}
cSectionHandler::~cSectionHandler()
{
Cancel(3);
cFilter *fi;
while ((fi = filters.First()) != NULL)
Detach(fi);
delete shp;
}
int cSectionHandler::Source(void)
{
return shp->channel.Source();
}
int cSectionHandler::Transponder(void)
{
return shp->channel.Transponder();
}
const cChannel *cSectionHandler::Channel(void)
{
return &shp->channel;
}
void cSectionHandler::Add(const cFilterData *FilterData)
{
Lock();
statusCount++;
cFilterHandle *fh;
for (fh = filterHandles.First(); fh; fh = filterHandles.Next(fh)) {
if (fh->filterData.Is(FilterData->pid, FilterData->tid, FilterData->mask))
break;
}
if (!fh) {
int handle = device->OpenFilter(FilterData->pid, FilterData->tid, FilterData->mask);
if (handle >= 0) {
fh = new cFilterHandle(*FilterData);
fh->handle = handle;
filterHandles.Add(fh);
}
}
if (fh)
fh->used++;
Unlock();
}
void cSectionHandler::Del(const cFilterData *FilterData)
{
Lock();
statusCount++;
cFilterHandle *fh;
for (fh = filterHandles.First(); fh; fh = filterHandles.Next(fh)) {
if (fh->filterData.Is(FilterData->pid, FilterData->tid, FilterData->mask)) {
if (--fh->used <= 0) {
device->CloseFilter(fh->handle);
filterHandles.Del(fh);
break;
}
}
}
Unlock();
}
void cSectionHandler::Attach(cFilter *Filter)
{
Lock();
statusCount++;
filters.Add(Filter);
Filter->sectionHandler = this;
if (on)
Filter->SetStatus(true);
Unlock();
}
void cSectionHandler::Detach(cFilter *Filter)
{
Lock();
statusCount++;
Filter->SetStatus(false);
Filter->sectionHandler = NULL;
filters.Del(Filter, false);
Unlock();
}
void cSectionHandler::SetChannel(const cChannel *Channel)
{
Lock();
shp->channel = Channel ? *Channel : cChannel();
Unlock();
}
void cSectionHandler::SetStatus(bool On)
{
Lock();
if (on != On) {
if (!On || (device->HasLock() && startFilters)) {
statusCount++;
for (cFilter *fi = filters.First(); fi; fi = filters.Next(fi)) {
fi->SetStatus(false);
if (On)
fi->SetStatus(true);
}
if (flush = On)
flushTimer.Set();
on = On;
waitForLock = false;
}
else
waitForLock = On;
}
Unlock();
}
#define FLUSH_TIME 100 // ms
void cSectionHandler::Action(void)
{
while (Running()) {
Lock();
if (waitForLock) {
startFilters = true;
SetStatus(true);
startFilters = false;
}
int NumFilters = filterHandles.Count();
pollfd pfd[NumFilters];
for (cFilterHandle *fh = filterHandles.First(); fh; fh = filterHandles.Next(fh)) {
int i = fh->Index();
pfd[i].fd = fh->handle;
pfd[i].events = POLLIN;
pfd[i].revents = 0;
}
int oldStatusCount = statusCount;
Unlock();
if (poll(pfd, NumFilters, (!on || waitForLock) ? 100 : 1000) > 0) {
for (int i = 0; i < NumFilters; i++) {
if (pfd[i].revents & POLLIN) {
cFilterHandle *fh = NULL;
LOCK_THREAD;
if (statusCount != oldStatusCount)
break;
for (fh = filterHandles.First(); fh; fh = filterHandles.Next(fh)) {
if (pfd[i].fd == fh->handle)
break;
}
if (fh) {
// Read section data:
unsigned char buf[4096]; // max. allowed size for any EIT section
int r = device->ReadFilter(fh->handle, buf, sizeof(buf));
if (flush)
continue; // we do the read anyway, to flush any data that might have come from a different transponder
if (r > 3) { // minimum number of bytes necessary to get section length
int len = (((buf[1] & 0x0F) << 8) | (buf[2] & 0xFF)) + 3;
if (len == r) {
// Distribute data to all attached filters:
int pid = fh->filterData.pid;
int tid = buf[0];
for (cFilter *fi = filters.First(); fi; fi = filters.Next(fi)) {
if (fi->Matches(pid, tid))
fi->Process(pid, tid, buf, len);
}
}
else
dsyslog("tp %d (%d/%02X) read incomplete section - len = %d, r = %d", Transponder(), fh->filterData.pid, buf[0], len, r);
}
}
}
}
if (flush)
flush = flushTimer.Elapsed() <= FLUSH_TIME;
}
}
}
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