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Code Issues Releases Wiki Activity

Fixed handling the 'pointer field' in generating and parsing PAT/PMT

This commit is contained in:
Klaus Schmidinger 2008-12-20 10:46:53 +01:00
parent 051f0def47
commit 5cbc33d897
3 changed files with 15 additions and 4 deletions
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1
CONTRIBUTORS
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@ -2201,6 +2201,7 @@ Frank Schmirler <vdr@schmirler.de>
for making entering text via the numeric keys check the characters against the
allowed characters
for fixing handling address masks in SVDRP host settings
for fixing handling the 'pointer field' in generating and parsing PAT/PMT
Jörn Reder <joern@zyn.de>
for reporting that a recording may unnecessarily block a device with a CAM, while

4
HISTORY
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@ -5849,6 +5849,8 @@ Video Disk Recorder Revision History
the patch from ftp://ftp.cadsoft.de/vdr/Developer/av7110_v4ldvb_api5_audiobuf_test_1.diff
to the driver (thanks to Oliver Endriss).
2008-12-17: Version 1.7.3
2008-12-20: Version 1.7.3
- Updated the Russian OSD texts (thanks to Oleg Roitburd).
- Fixed handling the 'pointer field' in generating and parsing PAT/PMT (thanks to
Frank Schmirler).

14
remux.c
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@ -11,7 +11,7 @@
* The cRepacker family's code was originally written by Reinhard Nissl <rnissl@gmx.de>,
* and adapted to the VDR coding style by Klaus.Schmidinger@cadsoft.de.
*
* $Id: remux.c 2.2 2008/12/13 14:30:15 kls Exp $
* $Id: remux.c 2.3 2008/12/20 10:38:47 kls Exp $
*/
#include "remux.h"
@ -2298,6 +2298,7 @@ void cPatPmtGenerator::GeneratePat(void)
p[i++] = 0x40; // flags (3), pid hi (5)
p[i++] = 0x00; // pid lo
p[i++] = 0x10; // flags (4), continuity counter (4)
p[i++] = 0x00; // pointer field (payload unit start indicator is set)
int PayloadStart = i;
p[i++] = 0x00; // table id
p[i++] = 0xB0; // section syntax indicator (1), dummy (3), section length hi (4)
@ -2367,13 +2368,18 @@ void cPatPmtGenerator::GeneratePmt(tChannelID ChannelID)
MakeCRC(buf + i, buf, i);
// split the PMT section into several TS packets:
uchar *q = buf;
bool pusi = true;
while (i > 0) {
uchar *p = pmt[numPmtPackets++];
int j = 0;
p[j++] = 0x47; // TS indicator
p[j++] = 0x40 | (P_PNR >> 8); // flags (3), pid hi (5)
p[j++] = (pusi ? 0x40 : 0x00) | (P_PNR >> 8); // flags (3), pid hi (5)
p[j++] = P_PNR & 0xFF; // pid lo
p[j++] = 0x10; // flags (4), continuity counter (4)
if (pusi) {
p[j++] = 0x00; // pointer field (payload unit start indicator is set)
pusi = false;
}
int l = TS_SIZE - j;
memcpy(p + j, q, l);
q += l;
@ -2412,6 +2418,7 @@ cPatPmtParser::cPatPmtParser(void)
void cPatPmtParser::ParsePat(const uchar *Data, int Length)
{
// The PAT is always assumed to fit into a single TS packet
Data += Data[0] + 1; // process pointer_field
SI::PAT Pat(Data, false);
if (Pat.CheckCRCAndParse()) {
dbgpatpmt("PAT: TSid = %d, c/n = %d, v = %d, s = %d, ls = %d\n", Pat.getTransportStreamId(), Pat.getCurrentNextIndicator(), Pat.getVersionNumber(), Pat.getSectionNumber(), Pat.getLastSectionNumber());
@ -2432,7 +2439,8 @@ void cPatPmtParser::ParsePmt(const uchar *Data, int Length)
{
// The PMT may extend over several TS packets, so we need to assemble them
if (pmtSize == 0) {
// this is the first packet
Data += Data[0] + 1; // this is the first packet
Length -= Data[0] + 1;
if (SectionLength(Data, Length) > Length) {
if (Length <= int(sizeof(pmt))) {
memcpy(pmt, Data, Length);