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vdr-plugin-satip/sectionfilter.c

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/*
* sectionfilter.c: SAT>IP plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include "config.h"
#include "sectionfilter.h"
cSatipSectionFilter::cSatipSectionFilter(int deviceIndexP, uint16_t pidP, uint8_t tidP, uint8_t maskP)
: pusiSeenM(0),
feedCcM(0),
doneqM(0),
secBufM(NULL),
secBufpM(0),
secLenM(0),
tsFeedpM(0),
pidM(pidP),
deviceIndexM(deviceIndexP)
{
//debug("cSatipSectionFilter::%s(%d, %d)", __FUNCTION__, deviceIndexM, pidM);
int i;
memset(secBufBaseM, 0, sizeof(secBufBaseM));
memset(filterValueM, 0, sizeof(filterValueM));
memset(filterMaskM, 0, sizeof(filterMaskM));
memset(filterModeM, 0, sizeof(filterModeM));
memset(maskAndModeM, 0, sizeof(maskAndModeM));
memset(maskAndNotModeM, 0, sizeof(maskAndNotModeM));
filterValueM[0] = tidP;
filterMaskM[0] = maskP;
// Invert the filter
for (i = 0; i < eDmxMaxFilterSize; ++i)
filterValueM[i] ^= 0xFF;
uint8_t mask, mode, doneq = 0;
for (i = 0; i < eDmxMaxFilterSize; ++i) {
mode = filterModeM[i];
mask = filterMaskM[i];
maskAndModeM[i] = (uint8_t)(mask & mode);
maskAndNotModeM[i] = (uint8_t)(mask & ~mode);
doneq |= maskAndNotModeM[i];
}
doneqM = doneq ? 1 : 0;
// Create sockets
socketM[0] = socketM[1] = -1;
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, socketM) != 0) {
char tmp[64];
error("Opening section filter sockets failed (device=%d pid=%d): %s", deviceIndexM, pidM, strerror_r(errno, tmp, sizeof(tmp)));
}
else if ((fcntl(socketM[0], F_SETFL, O_NONBLOCK) != 0) || (fcntl(socketM[1], F_SETFL, O_NONBLOCK) != 0)) {
char tmp[64];
error("Setting section filter socket to non-blocking mode failed (device=%d pid=%d): %s", deviceIndexM, pidM, strerror_r(errno, tmp, sizeof(tmp)));
}
}
cSatipSectionFilter::~cSatipSectionFilter()
{
//debug("cSatipSectionFilter::%s(%d, %d)", __FUNCTION__, deviceIndexM, pidM);
int tmp = socketM[1];
socketM[1] = -1;
if (tmp >= 0)
close(tmp);
tmp = socketM[0];
socketM[0] = -1;
if (tmp >= 0)
close(tmp);
secBufM = NULL;
}
inline uint16_t cSatipSectionFilter::GetLength(const uint8_t *dataP)
{
return (uint16_t)(3 + ((dataP[1] & 0x0f) << 8) + dataP[2]);
}
void cSatipSectionFilter::New(void)
{
tsFeedpM = secBufpM = secLenM = 0;
secBufM = secBufBaseM;
}
int cSatipSectionFilter::Filter(void)
{
if (secBufM) {
int i;
uint8_t neq = 0;
for (i = 0; i < eDmxMaxFilterSize; ++i) {
uint8_t calcxor = (uint8_t)(filterValueM[i] ^ secBufM[i]);
if (maskAndModeM[i] & calcxor)
return 0;
neq |= (maskAndNotModeM[i] & calcxor);
}
if (doneqM && !neq)
return 0;
// There is no data in the read socket, more can be written
if ((secLenM > 0) && (socketM[1] >= 0) && (socketM[0] >= 0)) {
for (i = 0; i < eWriteMaxRetries; ++i) {
if (select_single_desc(socketM[0], 10, false))
continue;
ssize_t len = write(socketM[1], secBufM, secLenM);
ERROR_IF(len < 0, "write()");
// Update statistics
if (len >= 0)
AddSectionStatistic(len, 1);
break;
}
if (i >= eWriteMaxRetries)
debug("Skipped section write (%d bytes)", secLenM);
}
}
return 0;
}
inline int cSatipSectionFilter::Feed(void)
{
if (Filter() < 0)
return -1;
secLenM = 0;
return 0;
}
int cSatipSectionFilter::CopyDump(const uint8_t *bufP, uint8_t lenP)
{
uint16_t limit, seclen, n;
if (tsFeedpM >= eDmxMaxSectionFeedSize)
return 0;
if (tsFeedpM + lenP > eDmxMaxSectionFeedSize)
lenP = (uint8_t)(eDmxMaxSectionFeedSize - tsFeedpM);
if (lenP <= 0)
return 0;
memcpy(secBufBaseM + tsFeedpM, bufP, lenP);
tsFeedpM = uint16_t(tsFeedpM + lenP);
limit = tsFeedpM;
if (limit > eDmxMaxSectionFeedSize)
return -1; // internal error should never happen
// Always set secbuf
secBufM = secBufBaseM + secBufpM;
for (n = 0; secBufpM + 2 < limit; ++n) {
seclen = GetLength(secBufM);
if ((seclen <= 0) || (seclen > eDmxMaxSectionSize) || ((seclen + secBufpM) > limit))
return 0;
secLenM = seclen;
if (pusiSeenM)
Feed();
secBufpM = uint16_t(secBufpM + seclen);
secBufM += seclen;
}
return 0;
}
void cSatipSectionFilter::Process(const uint8_t* dataP)
{
if (dataP[0] != TS_SYNC_BYTE)
return;
// Stop if not the PID this filter is looking for
if (ts_pid(dataP) != pidM)
return;
uint8_t count = payload(dataP);
// Check if no payload or out of range
if (count == 0)
return;
// Payload start
uint8_t p = (uint8_t)(TS_SIZE - count);
uint8_t cc = (uint8_t)(dataP[3] & 0x0f);
int ccok = ((feedCcM + 1) & 0x0f) == cc;
feedCcM = cc;
int dc_i = 0;
if (dataP[3] & 0x20) {
// Adaption field present, check for discontinuity_indicator
if ((dataP[4] > 0) && (dataP[5] & 0x80))
dc_i = 1;
}
if (!ccok || dc_i) {
// Discontinuity detected. Reset pusiSeenM = 0 to
// stop feeding of suspicious data until next PUSI=1 arrives
pusiSeenM = 0;
New();
}
if (dataP[1] & 0x40) {
// PUSI=1 (is set), section boundary is here
if (count > 1 && dataP[p] < count) {
const uint8_t *before = &dataP[p + 1];
uint8_t before_len = dataP[p];
const uint8_t *after = &before[before_len];
uint8_t after_len = (uint8_t)(count - 1 - before_len);
CopyDump(before, before_len);
// Before start of new section, set pusiSeenM = 1
pusiSeenM = 1;
New();
CopyDump(after, after_len);
}
}
else {
// PUSI=0 (is not set), no section boundary
CopyDump(&dataP[p], count);
}
}
cSatipSectionFilterHandler::cSatipSectionFilterHandler(int deviceIndexP, unsigned int bufferLenP)
:
#ifdef USE_THREADED_SECTIONFILTER
cThread("SAT>IP section handler", true),
ringBufferM(new cRingBufferLinear(bufferLenP, TS_SIZE, false, *cString::sprintf("SAT>IP SECTION HANDLER %d", deviceIndexP))),
#endif
mutexM(),
deviceIndexM(deviceIndexP)
{
debug("cSatipSectionFilterHandler::%s(%d)", __FUNCTION__, deviceIndexM);
// Initialize filter pointers
memset(filtersM, 0, sizeof(filtersM));
#ifdef USE_THREADED_SECTIONFILTER
// Create input buffer
if (ringBufferM) {
ringBufferM->SetTimeouts(100, 100);
ringBufferM->SetIoThrottle();
}
else
error("Failed to allocate buffer for section filter handler (device=%d): ", deviceIndexM);
Start();
#endif
}
cSatipSectionFilterHandler::~cSatipSectionFilterHandler()
{
debug("cSatipSectionFilterHandler::%s(%d)", __FUNCTION__, deviceIndexM);
#ifdef USE_THREADED_SECTIONFILTER
// Stop thread
if (Running())
Cancel(3);
DELETE_POINTER(ringBufferM);
#endif
// Destroy all filters
cMutexLock MutexLock(&mutexM);
for (int i = 0; i < eMaxSecFilterCount; ++i)
Delete(i);
}
#ifdef USE_THREADED_SECTIONFILTER
void cSatipSectionFilterHandler::Action(void)
{
debug("cSatipSectionFilterHandler::%s(%d): entering", __FUNCTION__, deviceIndexM);
bool processed = false;
// Do the thread loop
while (Running()) {
// Read one TS packet
if (ringBufferM) {
int len = 0;
if (processed) {
ringBufferM->Del(TS_SIZE);
processed = false;
}
uchar *p = ringBufferM->Get(len);
if (p && (len >= TS_SIZE)) {
if (*p != TS_SYNC_BYTE) {
for (int i = 1; i < len; ++i) {
if (p[i] == TS_SYNC_BYTE) {
len = i;
break;
}
}
ringBufferM->Del(len);
debug("cSatipSectionFilterHandler::%s(%d): Skipped %d bytes to sync on TS packet", __FUNCTION__, deviceIndexM, len);
continue;
}
// Process TS packet through all filters
mutexM.Lock();
for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
if (filtersM[i])
filtersM[i]->Process(p);
}
mutexM.Unlock();
processed = true;
continue;
}
}
cCondWait::SleepMs(10); // to avoid busy loop and reduce cpu load
}
debug("cSatipSectionFilterHandler::%s(%d): exiting", __FUNCTION__, deviceIndexM);
}
#endif
cString cSatipSectionFilterHandler::GetInformation(void)
{
//debug("cSatipSectionFilterHandler::%s(%d)", __FUNCTION__, deviceIndexM);
// loop through active section filters
cMutexLock MutexLock(&mutexM);
cString s = "";
unsigned int count = 0;
for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
if (filtersM[i]) {
s = cString::sprintf("%sFilter %d: %s Pid=0x%02X (%s)\n", *s, i,
*filtersM[i]->GetSectionStatistic(), filtersM[i]->GetPid(),
id_pid(filtersM[i]->GetPid()));
if (++count > SATIP_STATS_ACTIVE_FILTERS_COUNT)
break;
}
}
return s;
}
bool cSatipSectionFilterHandler::Delete(unsigned int indexP)
{
//debug("cSatipSectionFilterHandler::%s(%d): index=%d", __FUNCTION__, deviceIndexM, indexP);
if ((indexP < eMaxSecFilterCount) && filtersM[indexP]) {
//debug("cSatipSectionFilterHandler::%s(%d): found %d", __FUNCTION__, deviceIndexM, indexP);
cSatipSectionFilter *tmp = filtersM[indexP];
filtersM[indexP] = NULL;
delete tmp;
return true;
}
return false;
}
bool cSatipSectionFilterHandler::IsBlackListed(u_short pidP, u_char tidP, u_char maskP) const
{
//debug("cSatipSectionFilterHandler::%s(%d): pid=%d tid=%02X mask=%02X", __FUNCTION__, deviceIndexM, pidP, tidP, maskP);
// loop through section filter table
for (int i = 0; i < SECTION_FILTER_TABLE_SIZE; ++i) {
int index = SatipConfig.GetDisabledFilters(i);
// Check if matches
if ((index >= 0) && (index < SECTION_FILTER_TABLE_SIZE) &&
(section_filter_table[index].pid == pidP) && (section_filter_table[index].tid == tidP) &&
(section_filter_table[index].mask == maskP)) {
//debug("cSatipSectionFilterHandler::%s(%d): found %s", __FUNCTION__, deviceIndexM, section_filter_table[index].description);
return true;
}
}
return false;
}
int cSatipSectionFilterHandler::Open(u_short pidP, u_char tidP, u_char maskP)
{
// Lock
cMutexLock MutexLock(&mutexM);
// Blacklist check, refuse certain filters
if (IsBlackListed(pidP, tidP, maskP))
return -1;
// Search the next free filter slot
for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
if (!filtersM[i]) {
filtersM[i] = new cSatipSectionFilter(deviceIndexM, pidP, tidP, maskP);
//debug("cSatipSectionFilterHandler::%s(%d): pid=%d tid=%02X mask=%02X handle=%d index=%u", __FUNCTION__, deviceIndexM, pidP, tidP, maskP, filtersM[i]->GetFd(), i);
return filtersM[i]->GetFd();
}
}
// No free filter slot found
return -1;
}
void cSatipSectionFilterHandler::Close(int handleP)
{
// Lock
cMutexLock MutexLock(&mutexM);
// Search the filter for deletion
for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
if (filtersM[i] && (handleP == filtersM[i]->GetFd())) {
//debug("cSatipSectionFilterHandler::%s(%d): pid=%d handle=%d index=%u", __FUNCTION__, deviceIndexM, filtersM[i]->GetPid(), filtersM[i]->GetFd(), i);
Delete(i);
break;
}
}
}
int cSatipSectionFilterHandler::GetPid(int handleP)
{
// Lock
cMutexLock MutexLock(&mutexM);
// Search the filter for data
for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
if (filtersM[i] && (handleP == filtersM[i]->GetFd())) {
//debug("cSatipSectionFilterHandler::%s(%d): pid=%d handle=%d index=%u", __FUNCTION__, deviceIndexM, filtersM[i]->GetPid(), filtersM[i]->GetFd(), i);
return filtersM[i]->GetPid();
}
}
return -1;
}
void cSatipSectionFilterHandler::Write(uchar *bufferP, int lengthP)
{
//debug("cSatipSectionFilterHandler::%s(%d): length=%d", __FUNCTION__, deviceIndexM, lengthP);
#ifdef USE_THREADED_SECTIONFILTER
// Fill up the buffer
if (ringBufferM) {
int len = ringBufferM->Put(bufferP, lengthP);
if (len != lengthP)
ringBufferM->ReportOverflow(lengthP - len);
}
#else
// Lock
cMutexLock MutexLock(&mutexM);
uchar *p = bufferP;
int len = lengthP;
// Process TS packets through all filters
while (p && (len >= TS_SIZE)) {
if (*p != TS_SYNC_BYTE) {
for (int i = 1; i < len; ++i) {
if (p[i] == TS_SYNC_BYTE) {
p += i;
len -= i;
break;
}
}
}
for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
if (filtersM[i])
filtersM[i]->Process(p);
}
p += TS_SIZE;
len -= TS_SIZE;
}
#endif
}
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