// Definition of non-inline non-template functions
-#include <string>
-#include <iostream>
-#include <iomanip>
-#include <sys/ioctl.h>
-#include <linux/sockios.h>
-#include <linux/dvb/dmx.h>
-
-#include "Scheduler/Scheduler.hh"
-#include "Packets/DefaultBundle/EthernetPacket.hh"
-#include "Packets/MPEGDVBBundle/DatagramSection.hh"
-#include "Utils/membind.hh"
-#include "Socket/DVBDemuxHandles.hh"
-#include "Packets/ParseInt.hh"
-#include "Packets/Packet.hh"
+#include "ULEdec.hh"
+
#include "Packets/PacketData.hh"
+#include "Utils/hexdump.hh"
+#include "Utils/membind.hh"
#define PID 271
+#define TS_SYNC 0x47
#define prefix_
///////////////////////////////cc.p////////////////////////////////////////
-namespace {
- static const unsigned BLOCK_SIZE = 16;
+ULEdec::ULEdec()
+{
+ struct dmx_pes_filter_params pes_filter;
+ memset(&pes_filter, 0, sizeof (struct dmx_pes_filter_params));
+ pes_filter.pid = PID;
+ pes_filter.input = DMX_IN_FRONTEND;
+ pes_filter.output = DMX_OUT_TS_TAP;
+ pes_filter.pes_type = DMX_PES_OTHER;
+ pes_filter.flags = DMX_IMMEDIATE_START;
+ demuxHandle.protocol().setPESFilter( &pes_filter );
+
+ senf::Scheduler::instance().add(
+ dvrHandle, senf::membind(&ULEdec::handleEvent, this));
+
+ this->receiver_state = Idle;
+ this->priv_sndu_type_1 = false;
+}
- template <class Iterator>
- void hexdump(Iterator i, Iterator const & i_end, std::ostream& stream)
+void ULEdec::handleEvent(senf::FileHandle, senf::Scheduler::EventId event)
+{
+ senf::TransportPacket ts_packet (
+ senf::TransportPacket::create(188, senf::TransportPacket::noinit));
+ dvrHandle.read( ts_packet.data() );
+
+ // Check TS error conditions: sync_byte, transport_error_indicator, scrambling_control.
+ if ( (ts_packet->sync_byte() != TS_SYNC) ||
+ (ts_packet->transport_error_indicator() == true) ||
+ (ts_packet->transport_scrmbl_ctrl() != 0))
{
- unsigned offset (0);
- std::string ascii;
- for (; i != i_end; ++i, ++offset) {
- switch (offset % BLOCK_SIZE) {
- case 0:
- if (!ascii.empty()) {
- stream << " " << ascii << "\n";
- ascii = "";
+ std::cerr << "invalid ts packet\n";
+ // drop partly decoded SNDU, reset state, resync on PUSI.
+ return;
+ }
+
+ handleTSPacket(ts_packet);
+}
+
+void ULEdec::handleTSPacket(senf::TransportPacket ts_packet)
+{
+ senf::PacketData & payloadData (ts_packet.next().data());
+ iterator payload_iter = payloadData.begin();
+ iterator payload_end = payloadData.end();
+
+ std::cout << "New TS Packet:\n"
+ << "----------------------------------------------------------------------------\n";
+ senf::hexdump(payload_iter, payload_end, std::cout);
+ std::cout << "----------------------------------------------------------------------------\n";
+
+ // Synchronize continuity counter
+ this->priv_tscc = ts_packet->continuity_counter();
+
+ switch (ts_packet->pusi()) {
+ case 0: {
+ switch (this->receiver_state) {
+ case Idle:
+ return;
+ case Reassembly:
+ payload_iter = readContSNDUPacket( payload_iter, payload_end );
+ if (isSDNUPacketComplete()) {
+ this->receiver_state = Idle;
+ try {
+ handleSNDUPacket();
+ } catch (ULEdecException const & ex) {
+ std::cerr << ex.what() << "\n";
+ return;
}
- stream << " "
- << std::hex << std::setw(4) << std::setfill('0')
- << offset << ' ';
- break;
- case BLOCK_SIZE/2:
- stream << " ";
- ascii += ' ';
- break;
+ switch (std::distance( payload_iter, payload_end ))
+ case 0:
+ case 1:
+ return;
+ default:
+ if ( (*payload_iter++ << 8 | *payload_iter++) != ULE_END_INDICATOR )
+ std::cerr << "delimiting error 1\n";
+ } else {
+ BOOST_ASSERT( std::distance( payload_iter, payload_end ) == 0 );
}
- stream << ' ' << std::hex << std::setw(2) << std::setfill('0')
- << unsigned(*i);
- ascii += (*i >= ' ' && *i < 126) ? *i : '.';
}
- if (!ascii.empty()) {
- for (; (offset % BLOCK_SIZE) != 0; ++offset) {
- if ((offset % BLOCK_SIZE) == BLOCK_SIZE/2)
- stream << " ";
- stream << " ";
+ break;
+ }
+ case 1: {
+ // a PUSI value of 1 indicates the presence of a Payload Pointer.
+ unsigned char payload_pointer = *payload_iter++;
+ if (payload_pointer > 181) {
+ std::cerr << "invalid payload_pointer\n";
+ this->receiver_state = Idle;
+ return;
+ }
+ switch (this->receiver_state) {
+ case Idle:
+ std::advance(payload_iter, payload_pointer);
+ break;
+ case Reassembly:
+ // Reassembly Payload Pointer Checking
+ if (snduPacketBytesLeft() != payload_pointer) {
+ // delimiting error
+ std::cerr << "delimiting error 2\n";
+ std::advance(payload_iter, payload_pointer);
+ } else {
+ payload_iter = readContSNDUPacket( payload_iter, payload_end );
+ BOOST_ASSERT( isSDNUPacketComplete() );
+ try {
+ handleSNDUPacket();
+ } catch (ULEdecException const & ex) {
+ std::cerr << ex.what() << "\n";
+ this->receiver_state = Idle;
+ return;
+ }
}
- stream << " " << ascii << "\n";
}
- stream << std::dec;
+ this->receiver_state = Idle;
+ try {
+ do {
+ payload_iter = readNewSNDUPacket( payload_iter, payload_end );
+ if (! isSDNUPacketComplete()) {
+ BOOST_ASSERT( std::distance( payload_iter, payload_end ) == 0 );
+ this->receiver_state = Reassembly;
+ break;
+ }
+ handleSNDUPacket();
+ } while (std::distance(payload_iter, payload_end) < 2 );
+ }
+ catch (ULEdecException const & ex) {
+ std::cerr << ex.what() << "\n";
+ return;
+ }
}
+
+ } // end pusi-switch
}
-class MySniffer
+ULEdec::iterator ULEdec::readContSNDUPacket(iterator i, iterator const i_end)
{
- senf::DVBDemuxPESHandle demuxHandle;
- senf::DVBDvrHandle dvrHandle;
+ if (priv_sndu_type_1) {
+ this->snduPacket->type() |= *i++;
+ }
+ return readRawSNDUPacketData(i, i_end);
+}
-public:
- MySniffer()
- {
- struct dmx_pes_filter_params pes_filter;
- memset(&pes_filter, 0, sizeof (struct dmx_pes_filter_params));
- pes_filter.pid = PID;
- pes_filter.input = DMX_IN_FRONTEND;
- pes_filter.output = DMX_OUT_TS_TAP;
- pes_filter.pes_type = DMX_PES_OTHER;
- pes_filter.flags = DMX_IMMEDIATE_START;
-
- demuxHandle.protocol().setPESFilter( &pes_filter );
+
+ULEdec::iterator ULEdec::readNewSNDUPacket(iterator i, iterator const i_end)
+{
+ bool dbit = false;
+ senf::Packet::size_type sndu_length = *i++ << 8 | *i++;
+ if (sndu_length & 0x8000) {
+ sndu_length &= 0x7FFF;
+ dbit = true;
+ }
+ if (sndu_length < 5 || sndu_length == 0xffff) {
+ throw ULEdecException("SNDU length error");
+ }
+ this->snduPacket = senf::SNDUPacket::create(sndu_length+4);
+ this->snduPacket->d_bit() = dbit;
+ this->snduPacket->length() = sndu_length;
+ this->snduPacketData_iter = boost::next(this->snduPacket.data().begin(), 2);
+ this->priv_sndu_type_1 = false;
+
+ switch (std::distance(i, i_end)) {
+ case 1:
+ this->priv_sndu_type_1 = true;
+ this->snduPacket->type() = *i++ << 8;
+ this->snduPacketData_iter++;
+ case 0:
+ break;
- senf::Scheduler::instance().add(
- dvrHandle, senf::membind(&MySniffer::dumpSection, this));
+ default:
+ this->snduPacket->type() = *i++ << 8 | *i++;
+ std::advance(this->snduPacketData_iter, 2);
+ i = readRawSNDUPacketData(i, i_end);
}
+
+ return i;
+}
-private:
- void dumpSection(senf::FileHandle /* ignored */, senf::Scheduler::EventId event)
- {
- std::string data (dvrHandle.read());
- std::cout << data.length() << "\n";
- //senf::DatagramSection section (senf::DatagramSection::create(data));
- //section.dump(std::cout);
- //senf::PacketData & datagramData (section.last().data());
- //hexdump(datagramData.begin(), datagramData.end(), std::cout);
+
+ULEdec::iterator ULEdec::readRawSNDUPacketData(iterator i, iterator i_end)
+{
+ unsigned char how_much = std::min(
+ snduPacketBytesLeft(), std::distance(i, i_end) );
+ copy_n(i, how_much, this->snduPacketData_iter);
+ std::advance(i, how_much);
+ std::advance(this->snduPacketData_iter, how_much);
+ return i;
+}
+
+
+void ULEdec::handleSNDUPacket()
+{
+ this->snduPacket.dump(std::cout);
+ std::cout << "----------------------------------------------------------------------------\n\n";
+ if (this->snduPacket->crc() != this->snduPacket->calcCrc()) {
+ throw ULEdecException("CRC Error");
}
-};
+// senf::Packet nextPacket = this->snduPacket.next();
+// senf::hexdump(
+// nextPacket.data().begin(),
+// nextPacket.data().end(),
+// std::cout);
+
+}
+
+
+inline bool ULEdec::isSDNUPacketComplete()
+{
+ return this->snduPacketData_iter == this->snduPacket.data().end();
+}
+
+inline ULEdec::iterator::difference_type ULEdec::snduPacketBytesLeft()
+{
+ return std::distance( this->snduPacketData_iter, this->snduPacket.data().end() );
+}
+
int main(int argc, char const * argv[])
{
try {
- MySniffer sniffer;
+ ULEdec decoder;
senf::Scheduler::instance().process();
}
catch (std::exception const & ex) {
///////////////////////////////cc.e////////////////////////////////////////
#undef prefix_
-\f
+
// Local Variables:
// mode: c++
// fill-column: 100
projects / senf.git / blobdiff