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Checking the pointer field in cPatPmtParser::ParsePmt() only in 'payload start' packets

This commit is contained in:
Klaus Schmidinger 2009-01-23 16:43:23 +01:00
parent 4895d6b9e2
commit 1ca753003b
4 changed files with 33 additions and 19 deletions
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2
HISTORY
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@ -5950,3 +5950,5 @@ Video Disk Recorder Revision History
- Checking the remaining packet length after processing the pointer field in
cPatPmtParser::ParsePat() and cPatPmtParser::ParsePmt() (suggested by Frank
Schmirler).
- Checking the pointer field in cPatPmtParser::ParsePmt() only in 'payload start'
packets (suggested by Frank Schmirler).

11
device.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: device.c 2.7 2009/01/18 11:42:22 kls Exp $
* $Id: device.c 2.8 2009/01/23 16:02:21 kls Exp $
*/
#include "device.h"
@ -1020,12 +1020,11 @@ void cDevice::StillPicture(const uchar *Data, int Length)
uchar *buf = NULL;
int Size = 0;
while (Length >= TS_SIZE) {
int PayloadOffset = TsPayloadOffset(Data);
int Pid = TsPid(Data);
if (Pid == 0)
patPmtParser.ParsePat(Data + PayloadOffset, TS_SIZE - PayloadOffset);
patPmtParser.ParsePat(Data, TS_SIZE);
else if (Pid == patPmtParser.PmtPid())
patPmtParser.ParsePmt(Data + PayloadOffset, TS_SIZE - PayloadOffset);
patPmtParser.ParsePmt(Data, TS_SIZE);
else if (Pid == patPmtParser.Vpid()) {
if (TsPayloadStart(Data)) {
int l;
@ -1325,9 +1324,9 @@ int cDevice::PlayTs(const uchar *Data, int Length, bool VideoOnly)
cMutexLock MutexLock(&mutexCurrentAudioTrack);
int Pid = TsPid(Data);
if (Pid == 0)
patPmtParser.ParsePat(Data + PayloadOffset, Length - PayloadOffset);
patPmtParser.ParsePat(Data, Length);
else if (Pid == patPmtParser.PmtPid())
patPmtParser.ParsePmt(Data + PayloadOffset, Length - PayloadOffset);
patPmtParser.ParsePmt(Data, Length);
else if (Pid == patPmtParser.Vpid())
return PlayTsVideo(Data, Length);
else if (Pid == availableTracks[currentAudioTrack].id) {

26
remux.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.c 2.9 2009/01/23 14:31:43 kls Exp $
* $Id: remux.c 2.10 2009/01/23 16:43:23 kls Exp $
*/
#include "remux.h"
@ -214,8 +214,8 @@ void cPatPmtGenerator::GeneratePat(void)
memset(pat, 0xFF, sizeof(pat));
uchar *p = pat;
int i = 0;
p[i++] = 0x47; // TS indicator
p[i++] = 0x40; // flags (3), pid hi (5)
p[i++] = TS_SYNC_BYTE; // TS indicator
p[i++] = TS_PAYLOAD_START; // 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)
@ -292,8 +292,8 @@ void cPatPmtGenerator::GeneratePmt(tChannelID ChannelID)
while (i > 0) {
uchar *p = pmt[numPmtPackets++];
int j = 0;
p[j++] = 0x47; // TS indicator
p[j++] = (pusi ? 0x40 : 0x00) | (P_PNR >> 8); // flags (3), pid hi (5)
p[j++] = TS_SYNC_BYTE; // TS indicator
p[j++] = (pusi ? TS_PAYLOAD_START : 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) {
@ -337,6 +337,10 @@ cPatPmtParser::cPatPmtParser(void)
void cPatPmtParser::ParsePat(const uchar *Data, int Length)
{
// Unpack the TS packet:
int PayloadOffset = TsPayloadOffset(Data);
Data += PayloadOffset;
Length -= PayloadOffset;
// The PAT is always assumed to fit into a single TS packet
if ((Length -= Data[0] + 1) <= 0)
return;
@ -359,8 +363,14 @@ void cPatPmtParser::ParsePat(const uchar *Data, int Length)
void cPatPmtParser::ParsePmt(const uchar *Data, int Length)
{
// Unpack the TS packet:
bool PayloadStart = TsPayloadStart(Data);
int PayloadOffset = TsPayloadOffset(Data);
Data += PayloadOffset;
Length -= PayloadOffset;
// The PMT may extend over several TS packets, so we need to assemble them
if (pmtSize == 0) {
if (PayloadStart) {
pmtSize = 0;
if ((Length -= Data[0] + 1) <= 0)
return;
Data += Data[0] + 1; // this is the first packet
@ -375,7 +385,7 @@ void cPatPmtParser::ParsePmt(const uchar *Data, int Length)
}
// the packet contains the entire PMT section, so we run into the actual parsing
}
else {
else if (pmtSize > 0) {
// this is a following packet, so we add it to the pmt storage
if (Length <= int(sizeof(pmt)) - pmtSize) {
memcpy(pmt + pmtSize, Data, Length);
@ -390,6 +400,8 @@ void cPatPmtParser::ParsePmt(const uchar *Data, int Length)
// the PMT section is now complete, so we run into the actual parsing
Data = pmt;
}
else
return; // fragment of broken packet - ignore
SI::PMT Pmt(Data, false);
if (Pmt.CheckCRCAndParse()) {
dbgpatpmt("PMT: sid = %d, c/n = %d, v = %d, s = %d, ls = %d\n", Pmt.getServiceId(), Pmt.getCurrentNextIndicator(), Pmt.getVersionNumber(), Pmt.getSectionNumber(), Pmt.getLastSectionNumber());

13
remux.h
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.h 2.4 2009/01/06 12:40:43 kls Exp $
* $Id: remux.h 2.5 2009/01/23 16:40:27 kls Exp $
*/
#ifndef __REMUX_H
@ -172,7 +172,7 @@ public:
///< Generates a PMT section for the given ChannelId, for later use
///< with GetPmt().
uchar *GetPat(void);
///< Returns a pointer to the PAT section, which consist of exactly
///< Returns a pointer to the PAT section, which consists of exactly
///< one TS packet.
uchar *GetPmt(int &Index);
///< Returns a pointer to the Index'th TS packet of the PMT section.
@ -195,11 +195,12 @@ protected:
public:
cPatPmtParser(void);
void ParsePat(const uchar *Data, int Length);
///< Parses the given PAT Data, which is the payload of a single TS packet
///< from the PAT stream. The PAT may consist only of a single TS packet.
///< Parses the PAT data from the single TS packet in Data.
///< Length is always TS_SIZE.
void ParsePmt(const uchar *Data, int Length);
///< Parses the given PMT Data, which is the payload of a single TS packet
///< from the PMT stream. The PMT may consist of several TS packets, which
///< Parses the PMT data from the single TS packet in Data.
///< Length is always TS_SIZE.
///< The PMT may consist of several TS packets, which
///< are delivered to the parser through several subsequent calls to
///< ParsePmt(). The whole PMT data will be processed once the last packet
///< has been received.