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pat.cpp
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pat.cpp
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/*
* Copyright (C) 2004-2006, Donald A Graft, All Rights Reserved
*
* PAT/PMT table parser for PID detection.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this code; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "windows.h"
#include "resource.h"
#include "global.h"
PATParser::PATParser(void)
{
}
// Need to add transport re-syncing in case of errors.
int PATParser::SyncTransport(void)
{
int i;
unsigned char byte;
// Find a sync byte.
for (i = 0; i < LIMIT; i++)
{
if (fread(&byte, 1, 1, fin) == 0)
{
return 1;
}
if (byte == TS_SYNC_BYTE)
{
fseek(fin, TransportPacketSize - 1, SEEK_CUR);
if (fread(&byte, 1, 1, fin) == 0)
{
return 1;
}
if (byte == TS_SYNC_BYTE)
{
fseek(fin, -(TransportPacketSize + 1), SEEK_CUR);
break;
}
fseek(fin, -TransportPacketSize, SEEK_CUR);
}
}
if (i == LIMIT)
{
return 1;
}
return 0;
}
int PATParser::DumpRaw(HWND _hDialog, char *_filename)
{
hDialog = _hDialog;
filename = _filename;
return AnalyzeRaw();
}
int PATParser::AnalyzeRaw(void)
{
unsigned int i, pid = 0;
unsigned char stream_id;
int afc, pkt_count;
unsigned char buffer[204];
int read, pes_offset, pes_header_data_length, data_offset;
char listbox_line[255], description[80];
struct
{
unsigned int pid;
unsigned char stream_id;
} Pids[MAX_PIDS];
// Open the input file for reading.
if ((fin = fopen(filename, "rb")) == NULL)
{
if (hDialog != NULL)
{
sprintf(listbox_line, "Cannot open the input file!");
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
return 1;
}
resync:
if (SyncTransport() == 1)
{
fclose(fin);
return 1;
}
// Initialize the PID data table.
for (i = 0; i < MAX_PIDS; i++)
{
Pids[i].pid = 0xffffffff;
Pids[i].stream_id = 0;
}
// Process the transport packets looking for PIDs.
pkt_count = 0;
while ((pkt_count++ < MAX_PACKETS) && (read = fread(buffer, 1, TransportPacketSize, fin)) == TransportPacketSize)
{
if (buffer[0] != 0x47)
goto resync;
// Pick up the PID.
pid = ((buffer[1] & 0x1f) << 8) | buffer[2];
stream_id = 0;
// Check payload_unit_start_indicator.
if (buffer[1] & 0x40)
{
// Look for a payload.
afc = (buffer[3] & 0x30) >> 4;
if (afc == 1 || afc == 3)
{
// Skip the adaptation field (if present).
if (afc == 1)
{
pes_offset = 4;
}
else
{
pes_offset = 5 + buffer[4];
}
// Get the stream ID if there is a packet start code.
if (buffer[pes_offset] == 0 && buffer[pes_offset+1] == 0 && buffer[pes_offset+2] == 1)
stream_id = buffer[pes_offset+3];
if (stream_id == 0xbd)
{
// This is private stream 1, which may carry AC3 or DTS audio.
// Since all DTS frames fit in one PES packet, we can just
// look for the DTS audio frame header to distinguish the two.
pes_header_data_length = buffer[pes_offset+8];
data_offset = pes_offset + 9 + pes_header_data_length;
if (buffer[data_offset] == 0x7f &&
buffer[data_offset+1] == 0xfe &&
buffer[data_offset+2] == 0x80 &&
buffer[data_offset+3] == 0x01)
{
// Borrow this reserved value to label DTS.
stream_id = 0xfe;
}
}
}
// Find an empty table entry and enter this PID if we haven't already.
for (i = 0; Pids[i].pid != 0xffffffff && i < MAX_PIDS; i++)
{
if (Pids[i].pid == pid) break;
}
if (Pids[i].pid == 0xffffffff)
{
Pids[i].pid = pid;
Pids[i].stream_id = stream_id;
}
}
}
// Display the detection results in the dialog box.
for (i = 0; Pids[i].pid != 0xffffffff && i < MAX_PIDS; i++)
{
if (Pids[i].pid == 0)
strcpy(description, "PAT");
else if (Pids[i].pid == 1)
strcpy(description, "CAT");
else if (Pids[i].pid >= 2 && Pids[i].pid <= 0xf)
strcpy(description, "Reserved");
else if (Pids[i].pid == 0x1fff)
strcpy(description, "Null");
else if (Pids[i].stream_id == 0xbc)
strcpy(description, "Program Stream Map");
else if (Pids[i].stream_id == 0xbd || Pids[i].stream_id == 0xfd)
{
if (!hDialog && Pids[i].pid == audio_pid)
{
audio_type = 0x81;
fclose(fin);
return 0;
}
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x2)
MPEG2_Transport_AudioPID = Pids[i].pid;
strcpy(description, "Private Stream 1 (AC3/DTS Audio)");
}
else if (Pids[i].stream_id == 0xbe)
strcpy(description, "Padding Stream");
else if (Pids[i].stream_id == 0xbf)
strcpy(description, "Private Stream 2");
else if (((Pids[i].stream_id & 0xe0) == 0xc0) ||
(Pids[i].stream_id == 0xfa))
{
if (!hDialog && Pids[i].pid == audio_pid)
{
// The demuxing code is the same for MPEG and AAC.
// The only difference will be the filename.
// The demuxing code will look at the audio sync word to
// decide between the two.
audio_type = 0x4;
fclose(fin);
return 0;
}
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x2)
MPEG2_Transport_AudioPID = Pids[i].pid;
strcpy(description, "MPEG1/MPEG2/AAC Audio");
}
else if ((Pids[i].stream_id & 0xf0) == 0xe0)
{
if (op == InitialPids && MPEG2_Transport_VideoPID == 0x2)
MPEG2_Transport_VideoPID = Pids[i].pid;
strcpy(description, "MPEG Video");
}
else if (Pids[i].stream_id == 0xf0)
strcpy(description, "ECM Stream");
else if (Pids[i].stream_id == 0xf1)
strcpy(description, "EMM Stream");
else if (Pids[i].stream_id == 0xf9)
strcpy(description, "Ancillary Stream");
else if (Pids[i].stream_id == 0xfe)
{
if (!hDialog && Pids[i].pid == audio_pid)
{
audio_type = 0xfe;
fclose(fin);
return 0;
}
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x2)
MPEG2_Transport_AudioPID = Pids[i].pid;
strcpy(description, "Private Stream 1 (DTS Audio)");
}
else if (Pids[i].stream_id == 0xff)
strcpy(description, "Program Stream Directory");
else if (Pids[i].stream_id == PCR_STREAM)
strcpy(description, "PCR");
else
strcpy(description, "Other");
if (hDialog != NULL)
{
sprintf(listbox_line, "0x%x (%d): %s", Pids[i].pid, Pids[i].pid, description);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
}
fclose(fin);
return 0;
}
int PATParser::DumpPAT(HWND _hDialog, char *_filename)
{
op = Dump;
hDialog = _hDialog;
filename = _filename;
return AnalyzePAT();
}
int PATParser::DumpPSIP(HWND _hDialog, char *_filename)
{
op = Dump;
hDialog = _hDialog;
filename = _filename;
return AnalyzePSIP();
}
int PATParser::GetAudioType(char *_filename, unsigned int _audio_pid)
{
op = AudioType;
hDialog = NULL;
filename = _filename;
audio_pid = _audio_pid;
audio_type = 0xffffffff;
if ((AnalyzePAT() == 0) && (audio_type != 0xffffffff))
return audio_type;
else if ((AnalyzeRaw() == 0) && (audio_type != 0xffffffff))
return audio_type;
else
return -1;
}
int PATParser::DoInitialPids(char *_filename)
{
op = InitialPids;
hDialog = NULL;
filename = _filename;
AnalyzePAT();
if (MPEG2_Transport_VideoPID == 0x2)
{
AnalyzeRaw();
}
return 0;
}
int PATParser::AnalyzePAT(void)
{
unsigned int entry;
char listbox_line[255];
// First, we need to get from the PAT the list of PMT PIDs that we will need
// to examine.
num_pmt_pids = 0;
first_pat = first_pmt = true;
// Open the input file for reading.
if ((fin = fopen(filename, "rb")) == NULL)
{
if (op == Dump)
{
sprintf(listbox_line, "Cannot open the input file!");
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
return 1;
}
if (SyncTransport() == 1)
{
fclose(fin);
return 1;
}
// Acquire and parse the PAT.
GetTable(PAT_PID);
// Exit if we didn't find the PAT.
if (first_pat == true)
{
fclose(fin);
return 1;
}
// Now we have to get the PMT tables to retrieve the actual
// program information. Scan on each PMT PID in turn.
for (entry = 0, num_programs = 0; entry < num_pmt_pids; entry++)
{
// Start again at the beginning of the file.
fseek(fin, 0, SEEK_SET);
if (SyncTransport() == 1)
{
fclose(fin);
return 1;
}
// Acquire and parse the PMT.
GetTable(pmt_pids[entry]);
}
fclose(fin);
return 0;
}
int PATParser::AnalyzePSIP(void)
{
char listbox_line[255];
first_pat = true;
// Open the input file for reading.
if ((fin = fopen(filename, "rb")) == NULL)
{
if (op == Dump)
{
sprintf(listbox_line, "Cannot open the input file!");
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
return 1;
}
if (SyncTransport() == 1)
{
fclose(fin);
return 1;
}
// Acquire and parse the PAT.
GetTable(PSIP_PID);
// Exit if we didn't find the PAT.
if (first_pat == true)
{
fclose(fin);
return 1;
}
fclose(fin);
return 0;
}
int PATParser::ProcessPSIPSection(void)
{
unsigned int i, j, ndx, ndx2, program, num_channels_in_section, elements;
unsigned int descriptors_length, length, tag, pcrpid, type, pid;
char *stream_type;
char listbox_line[255];
// We want only current tables.
if (!(section[5] & 0x01))
return 0;
num_channels_in_section = section[9];
first_pat = false;
for (i = 0, ndx = 10; i < num_channels_in_section; i++)
{
program = (section[ndx+24] << 8) + section[ndx+25];
if (op == Dump)
{
sprintf(listbox_line, "Program %d", program);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
descriptors_length = (section[ndx+30] << 8) + section[ndx+31];
descriptors_length &= 0x3ff;
ndx += 32;
ndx2 = ndx;
while (ndx2 < ndx + descriptors_length)
{
tag = section[ndx2];
length = section[ndx2+1];
pcrpid = (section[ndx2+2] << 8) + section[ndx2+3];
pcrpid &= 0x1fff;
if (op == Dump)
{
sprintf(listbox_line, " PCR on PID 0x%x (%d)", pcrpid, pcrpid);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
elements = section[ndx2+4];
for (j = 0; j < elements; j++)
{
type = section[ndx2+5+j*6];
switch (type)
{
case 0x01:
stream_type = "MPEG1 Video";
break;
case 0x02:
stream_type = "MPEG2 Video";
break;
case 0x03:
stream_type = "MPEG1 Audio";
break;
case 0x04:
stream_type = "MPEG2 Audio";
break;
case 0x05:
stream_type = "Private Sections";
break;
case 0x07:
stream_type = "Teletext/Subtitling";
break;
case 0x0f:
case 0x11:
stream_type = "AAC Audio";
break;
case 0x80:
// This could be private stream video or LPCM audio.
stream_type = "Private Stream";
break;
case 0x81:
// This could be AC3 or DTS audio.
stream_type = "AC3/DTS Audio";
break;
// These are found on bluray disks.
case 0x85:
case 0x86:
stream_type = "DTS Audio";
break;
default:
stream_type = "Other";
break;
}
pid = (section[ndx2+5+j*6+1] << 8) + section[ndx2+5+j*6+2];
pid &= 0x1fff;
if (op == Dump)
{
sprintf(listbox_line, " %s on PID 0x%x (%d)", stream_type, pid, pid);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
}
ndx2 += length + 2;
}
ndx += descriptors_length;
}
return 1;
}
int PATParser::ProcessPATSection(void)
{
unsigned int i, j, ndx, section_length, number, last, program, pmtpid;
// We want only current tables.
if (!(section[5] & 0x01))
return 0;
section_length = ((section[1] & 0x03) << 8);
section_length |= section[2];
// Get the number of this section.
number = section[6];
// Get the number of the last section.
last = section[7];
// Now we parse the program/pid tuples.
ndx = 8;
for (i = 0; i < section_length - 9;)
{
program = section[ndx+i++] << 8;
program |= section[ndx+i++];
pmtpid = (section[ndx+i++] & 0x1f) << 8;
pmtpid |= section[ndx+i++];
// Skip the Network Information Table (NIT).
if (program != 0)
{
// Store the PTM PID if we haven't already.
for (j = 0; j < num_pmt_pids; j++)
if (pmt_pids[j] == pmtpid)
break;
if (j == num_pmt_pids)
pmt_pids[num_pmt_pids++] = pmtpid;
}
}
first_pat = false;
// If this is the last section number, we're done.
return (number == last);
}
int PATParser::ProcessPMTSection(void)
{
unsigned int j, ndx, section_length, program, pid, pcrpid;
unsigned int descriptors_length, es_descriptors_length, type, encrypted;
char listbox_line[255];
char *stream_type;
// We want only current tables.
if (!(section[5] & 0x01))
return 0;
section_length = ((section[1] & 0x03) << 8);
section_length |= section[2];
// Check the program number.
program = section[3] << 8;
program |= section[4];
// If we're setting the initial PIDs automatically, then
// we're intersted in only the first program.
if (op == InitialPids && num_programs > 0)
return 0;
// We stop when we see a progam that we've already seen.
for (j = 0; j < num_programs; j++)
if (programs[j] == program)
break;
if (j != num_programs)
return 1;
programs[num_programs++] = program;
if (op == Dump)
{
sprintf(listbox_line, "Program %d", program);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
// Get the PCRPID.
pcrpid = (section[8] & 0x1f) << 8;
pcrpid |= section[9];
if (op == InitialPids)
MPEG2_Transport_PCRPID = pcrpid;
else if (op == Dump)
{
sprintf(listbox_line, " PCR on PID 0x%x (%d)", pcrpid, pcrpid);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
// Skip the descriptors (if any).
ndx = 10;
descriptors_length = (section[ndx++] & 0x0f) << 8;
descriptors_length |= section[ndx++];
ndx += descriptors_length;
// Now we have the actual program data.
while (ndx < section_length - 4)
{
switch (type = section[ndx++])
{
case 0x01:
stream_type = "MPEG1 Video";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_VideoPID == 0x02)
MPEG2_Transport_VideoPID = pid;
break;
case 0x02:
stream_type = "MPEG2 Video";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_VideoPID == 0x02)
MPEG2_Transport_VideoPID = pid;
break;
case 0x03:
stream_type = "MPEG1 Audio";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
break;
case 0x04:
stream_type = "MPEG2 Audio";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
break;
case 0x05:
stream_type = "Private Sections";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
break;
case 0x06:
// Have to parse the ES descriptors to figure this out.
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
break;
case 0x07:
stream_type = "Teletext/Subtitling";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
break;
case 0x0f:
case 0x11:
// The demuxing code is the same for MPEG and AAC.
// The only difference will be the filename.
// The demuxing code will look at the audio sync word to
// decide between the two.
type = 0x04;
stream_type = "AAC Audio";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
break;
case 0x80:
// This could be private stream video or LPCM audio.
stream_type = "Private Stream";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
break;
case 0x81:
// This could be AC3 or DTS audio.
stream_type = "AC3/DTS Audio";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
break;
// These are found on bluray disks.
case 0x85:
case 0x86:
stream_type = "DTS Audio";
type = 0xfe;
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
break;
default:
stream_type = "Other";
pid = (section[ndx++] & 0x1f) << 8;
pid |= section[ndx++];
break;
}
// Parse the ES descriptors if necessary.
es_descriptors_length = (section[ndx++] & 0x0f) << 8;
es_descriptors_length |= section[ndx++];
encrypted = 0;
if (es_descriptors_length)
{
unsigned int start = ndx, end = ndx + es_descriptors_length;
int tag, length;
// See if the ES is scrambled.
do
{
tag = section[ndx++];
if (tag == 0x09)
encrypted = 1;
length = section[ndx++];
ndx += length;
} while (ndx < end);
ndx = start;
if (type == 0x80)
{
// This might be private stream video.
// Parse the descriptors for a video descriptor.
int hadVideo = 0, hadAudio = 0;
do
{
tag = section[ndx++];
if (tag == 0x02)
hadVideo = 1;
else if (tag == 0x05)
hadAudio = 1;
length = section[ndx++];
ndx += length;
} while (ndx < end);
ndx = end;
if (hadVideo == 1)
{
stream_type = "Private Stream Video";
type = 0x02;
if (op == InitialPids && MPEG2_Transport_VideoPID == 0x02)
MPEG2_Transport_VideoPID = pid;
}
else if (hadAudio == 1)
{
stream_type = "LPCM Audio";
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
}
}
else if (type == 0x06)
{
// Parse the descriptors for a DTS audio descriptor.
unsigned int end = ndx + es_descriptors_length;
int hadDTS = 0, hadTeletext = 0;
do
{
tag = section[ndx++];
if (tag == 0x73)
hadDTS = 1;
else if (tag == 0x05)
{
if (section[ndx+1] == 0x44 && section[ndx+2] == 0x54 && section[ndx+3] == 0x53)
hadDTS = 1;
}
else if (tag == 0x56)
hadTeletext = 1;
length = section[ndx++];
ndx += length;
} while (ndx < end);
ndx = end;
if (hadTeletext == 1)
{
stream_type = "Teletext";
}
else if (hadDTS == 1)
{
stream_type = "DTS Audio";
type = 0xfe;
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
}
else
{
stream_type = "AC3 Audio";
type = 0x81;
if (op == InitialPids && MPEG2_Transport_AudioPID == 0x02)
MPEG2_Transport_AudioPID = pid;
}
}
else
{
ndx += es_descriptors_length;
}
}
else if (type == 0x06)
{
// The following assignments will be used if there are no descriptors.
stream_type = "AC3/DTS Audio";
type = 0x81;
}
if (op == Dump)
{
sprintf(listbox_line, " %s on PID 0x%x (%d)", stream_type, pid, pid);
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
if (encrypted == 1)
{
sprintf(listbox_line, " [Scrambled]");
SendDlgItemMessage(hDialog, IDC_PID_LISTBOX, LB_ADDSTRING, 0, (LPARAM)listbox_line);
}
}
if (op == AudioType && pid == audio_pid)
{
if (type != 0x81)
{
audio_type = type;
return 0;
}
// If the packet size is 192, it's probably M2TS (bluray)
// and so we accept it as AC3.
else if (TransportPacketSize == 192)
{
audio_type = type;
return 0;
}
// If it's private stream 1, it could be AC3 or DTS.
// Force raw detection to find out which.
return 1;
}
}
return 0;
}
void PATParser::GetTable(unsigned int table_pid)
{
unsigned char byte;
unsigned int pid, ndx, section_length;
int read;
int pkt_count;
int ret;
// Process the transport packets.
pkt_count = 0;
section_ptr = section;
while ((pkt_count++ < MAX_PACKETS) && (read = fread(buffer, 1, TransportPacketSize, fin)) == TransportPacketSize)
{
// Check that this is the desired PID.
pid = ((buffer[1] & 0x1f) << 8) | buffer[2];
if (pid != table_pid)
continue;
// We have a table packet.
// Check error indicator.
if (buffer[1] & 0x80)
continue;
// Check for presence of a section start.
if ((section_ptr == section) && !(buffer[1] & 0x40))
continue;
// Skip if there is no payload.
byte = (unsigned char) ((buffer[3] & 0x30) >> 4);
if (byte == 0 || byte == 2)
continue;
// Skip the adaptation field (if any).
ndx = 4;
if (byte == 3)
{
ndx += buffer[ndx] + 1;
}
// This equality will fail when we have started gathering a section,
// but it overflowed into the next transport packet. So here we collect
// the rest of the section.
if (section_ptr != section)
{
// Collect the section data.
if (section_length <= TransportPacketSize - ndx - (TransportPacketSize == 192 ? 4 : 0))
{
// The remainder of the section is contained entirely
// in this packet. Skip the pointer field if one exists.
unsigned char *start;
start = &buffer[ndx];
if (buffer[1] & 0x40)
start++;
memcpy(section_ptr, start, section_length);
section_ptr += section_length;
// Parse the table.
switch (table_pid)
{
case PAT_PID:
ret = ProcessPATSection();
break;
case PSIP_PID:
ret = ProcessPSIPSection();
break;
default:
ret = ProcessPMTSection();
break;
}
if (ret)
break;
// Get ready for collection of the next section.
section_ptr = section;
// Check the section syntax indicator to see if another
// section follows in this packet.
if (!(buffer[1] & 0x40))
{
// No more sections in this packet.
continue;
}
// If we reach here, there is another section following
// this one, so we fall through to the code below.
}
else
{
// The section is spilling over to the next packet.
// There can't be a pointer field, so there's no need to
// check for it.
memcpy(section_ptr, &buffer[ndx], TransportPacketSize - ndx - (TransportPacketSize == 192 ? 4 : 0));
section_ptr += (TransportPacketSize - ndx - (TransportPacketSize == 192 ? 4 : 0));
section_length -= (TransportPacketSize - ndx - (TransportPacketSize == 192 ? 4 : 0));
continue;
}
}
// Read the section pointer field and use it to skip to the start of the section.
ndx += buffer[ndx] + 1;
// Now pointing to the start of the section. Check that the table id is correct.
if (buffer[ndx] != (table_pid == PAT_PID ? 0 : (table_pid == PSIP_PID ? 0xc8 : 2)))
continue;
another_section:
// Check the section syntax indicator.
if (table_pid == PSIP_PID)
{
if ((buffer[ndx+1] & 0xf0) != 0xf0)
continue;
}
else
{
if ((buffer[ndx+1] & 0xc0) != 0x80)
continue;
}
// Check and get section length.
if ((buffer[ndx+1] & 0x0c) != 0)
continue;
section_length = ((buffer[ndx+1] & 0x03) << 8);
section_length |= buffer[ndx+2];
if (section_length > 0x3fd)
continue;
if (table_pid == PAT_PID)
first_pat = false;
else
first_pmt = false;
if (ndx + section_length + 3 <= (unsigned int) TransportPacketSize - (TransportPacketSize == 192 ? 4 : 0))
{
// The section is entirely contained in this packet.
// Collect the section data.
memcpy(section_ptr, &buffer[ndx], section_length);
section_ptr += section_length;
// Parse the section.
switch (table_pid)
{
case PAT_PID:
ret = ProcessPATSection();
break;
case PSIP_PID:
ret = ProcessPSIPSection();
break;
default:
ret = ProcessPMTSection();
break;
}
if (ret)
break;
// Get ready for collecting the next section.
section_ptr = section;
// Check to see if another section follows in this packet
// by looking for the table ID. It would be stuffing if
// there was no following section.
if (buffer[ndx+section_length+3] == 0x02)
{
ndx += section_length + 3;
goto another_section;
}
}
else
{
// This section spills over to the next transport packet.
// Collect the first part and get ready to collect the
// second part from the next packet.
memcpy(section_ptr, &buffer[ndx], TransportPacketSize - ndx - (TransportPacketSize == 192 ? 4 : 0));
section_ptr += (TransportPacketSize - ndx - (TransportPacketSize == 192 ? 4 : 0));
section_length -= (TransportPacketSize - 3 - ndx - (TransportPacketSize == 192 ? 4 : 0));
continue;
}
}
}