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vdr/remux.c
Klaus Schmidinger 5619c0602b Version 1.7.17 
- Updated the Estonian OSD texts (thanks to Arthur Konovalov).
- Fixed following symbolic links in RemoveFileOrDir() (cont'd) (thanks to
  Steffen Barszus).
- Changed the description of cDevice::GetSTC() to make it mandatory for devices
  that can replay.
- Removed the check for positive STC values from cDvbSubtitleConverter::Action().
- Added cString::operator=(const char *String) (suggested by Antti Seppälä).
- Some spelling fixes (thanks to Ville Skyttä).
- Passing package name and version to xgettext (thanks to Ville Skyttä).
- Made 'dist' target dependent on up to date *.po (thanks to Ville Skyttä).
- Added Language and fixed Language-Team header of *.po (thanks to Ville Skyttä).
- Updated the Lithuanian OSD texts (thanks to Valdemaras Pipiras).
- Fixed detecting frames on channels that broadcast with 50 or 60 fps.
  This avoids artifacts during fast forward/rewind when replaying recordings from such
  channels. To fix the index of existing recordings from such channels, just delete the
  'index' file of the recording and VDR will generate a new one the next time you play it.
  You should also change the line "F 25" to "F 50" in the 'info' file of that recording.
- Added support for "registration descriptor" to 'libsi' and using it in pat.c (thanks
  to Rolf Ahrenberg).
- Fixed unjustified log entries about changed channel pids (reported by Derek Kelly).
- Added an include of VDR's 'Make.global' to libsi's Makefile (thanks to Rolf
  Ahrenberg).
- Removed displaying the "contents" information from the "Classic VDR" and
  "ST:TNG Panels" skins, because it is often wrong and nothing but irritating.
- Added typecasts to avoid gcc 4.5 warnings in switch statements on eKeys
  variables where additional 'k_...' flags are used.
- Fixed inclusion of <stdarg.h> (thanks to Henning Heinold).
- Changed "frame duration" to "frame rate" in vdr.5 (reported by Tobias Grimm).
- Removing a cRemote from the Remotes list in case its initialization failed (thanks
  to Dominik Strasser).
- Added LDFLAGS to the linker calls in the Makefiles (thanks to Joerg Bornkessel and
  Paul Menzel).
- Now updating the 'frames per second' data in the list of recordings when a new
  recording is started that has a frame rate other than the default.
- The include path to the freetype2 header files is now retrieved via a call to
  'pkg-config --cflags freetype2' (suggested by Andreas Oberritter).
- The OSD now has full TrueColor support. There can be several "pixmaps" that can
  be overlayed with alpha blending. All existing skins should work out of the box
  with the TrueColor OSD - the only exception being cOsd::GetBitmap(). Since the
  TrueColor OSD doesn't use bitmaps, this function will return a dummy bitmap, which
  may not be what the plugin expects. As long as this bitmap is only used for setting
  the palette, there is no problem. However, any other operations on this bitmap will
  have no effect. See the description of the cPixmap functions in osd.h for details
  about the new functionalities.
  The "ST:TNG Panels" skin has been enhanced to automatically use the TrueColor OSD
  if available.
  The "osddemo" plugin has been extended to show some of the possibilities of the
  TrueColor OSD if it is run on a system that actually provides TrueColor support.
  Thanks to Reinhard Nissl for some valuable input, help with debugging, and an
  implementation of the AlphaBlend() function.
- Updated the Slovakian language texts (thanks to Milan Hrala).
- Added Serbian language texts (thanks to Milan Cvijanovic).
- Fixed reallocating memory in the "pictures" plugin (reported by Paul Menzel, with
  input from Oliver Endriss).
- Fixed reallocating memory in cTsToPes::PutTs() (suggested by Oliver Endriss).
- Now checking the result of all realloc() calls.
- Fixed setting up the 'Recordings' menu in case there are several recordings
  with exactly the same name (reported by Marcus Hilbrich).
- Setting the audio type of language descriptors to 0x00 in the PAT/PMT generator
  (thanks to Anssi Hannula).
- Changed the compiler optimization flag to -O3, which gives quite a performance
  boost in the AlphaBlend() function.
- While replaying, the editing marks are now updated every 10 seconds (based on a
  patch from Manuel Reimer).
- Now reducing the thread and I/O priority cCuttingThread::Action() to make the
  foreground process more responsive (suggested by Frank Neumann).
- Removed checking for minimum line length of 21 characters in the LIRC receiver code
  (reported by Gerald Dachs).
- Updated the Romanian OSD texts (thanks to Lucian Muresan).
- Now storing the original display size when handling DVB subtitles (thanks to
  Reinhard Nissl).
- The original display size of subtitles is now used to scale them properly when
  displaying them on an HD OSD.
2011-03-19 19:02:09 +01:00

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/*
* remux.c: Tools for detecting frames and handling PAT/PMT
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.c 2.51 2011/02/26 15:51:04 kls Exp $
*/
#include "remux.h"
#include "device.h"
#include "libsi/si.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
#include "shutdown.h"
#include "tools.h"
// Set these to 'true' for debug output:
static bool DebugPatPmt = false;
static bool DebugFrames = false;
#define dbgpatpmt(a...) if (DebugPatPmt) fprintf(stderr, a)
#define dbgframes(a...) if (DebugFrames) fprintf(stderr, a)
ePesHeader AnalyzePesHeader(const uchar *Data, int Count, int &PesPayloadOffset, bool *ContinuationHeader)
{
if (Count < 7)
return phNeedMoreData; // too short
if ((Data[6] & 0xC0) == 0x80) { // MPEG 2
if (Count < 9)
return phNeedMoreData; // too short
PesPayloadOffset = 6 + 3 + Data[8];
if (Count < PesPayloadOffset)
return phNeedMoreData; // too short
if (ContinuationHeader)
*ContinuationHeader = ((Data[6] == 0x80) && !Data[7] && !Data[8]);
return phMPEG2; // MPEG 2
}
// check for MPEG 1 ...
PesPayloadOffset = 6;
// skip up to 16 stuffing bytes
for (int i = 0; i < 16; i++) {
if (Data[PesPayloadOffset] != 0xFF)
break;
if (Count <= ++PesPayloadOffset)
return phNeedMoreData; // too short
}
// skip STD_buffer_scale/size
if ((Data[PesPayloadOffset] & 0xC0) == 0x40) {
PesPayloadOffset += 2;
if (Count <= PesPayloadOffset)
return phNeedMoreData; // too short
}
if (ContinuationHeader)
*ContinuationHeader = false;
if ((Data[PesPayloadOffset] & 0xF0) == 0x20) {
// skip PTS only
PesPayloadOffset += 5;
}
else if ((Data[PesPayloadOffset] & 0xF0) == 0x30) {
// skip PTS and DTS
PesPayloadOffset += 10;
}
else if (Data[PesPayloadOffset] == 0x0F) {
// continuation header
PesPayloadOffset++;
if (ContinuationHeader)
*ContinuationHeader = true;
}
else
return phInvalid; // unknown
if (Count < PesPayloadOffset)
return phNeedMoreData; // too short
return phMPEG1; // MPEG 1
}
#define VIDEO_STREAM_S 0xE0
// --- cRemux ----------------------------------------------------------------
void cRemux::SetBrokenLink(uchar *Data, int Length)
{
int PesPayloadOffset = 0;
if (AnalyzePesHeader(Data, Length, PesPayloadOffset) >= phMPEG1 && (Data[3] & 0xF0) == VIDEO_STREAM_S) {
for (int i = PesPayloadOffset; i < Length - 7; i++) {
if (Data[i] == 0 && Data[i + 1] == 0 && Data[i + 2] == 1 && Data[i + 3] == 0xB8) {
if (!(Data[i + 7] & 0x40)) // set flag only if GOP is not closed
Data[i + 7] |= 0x20;
return;
}
}
dsyslog("SetBrokenLink: no GOP header found in video packet");
}
else
dsyslog("SetBrokenLink: no video packet in frame");
}
// --- Some TS handling tools ------------------------------------------------
int64_t TsGetPts(const uchar *p, int l)
{
// Find the first packet with a PTS and use it:
while (l > 0) {
const uchar *d = p;
if (TsPayloadStart(d) && TsGetPayload(&d) && PesHasPts(d))
return PesGetPts(d);
p += TS_SIZE;
l -= TS_SIZE;
}
return -1;
}
void TsSetTeiOnBrokenPackets(uchar *p, int l)
{
bool Processed[MAXPID] = { false };
while (l >= TS_SIZE) {
if (*p != TS_SYNC_BYTE)
break;
int Pid = TsPid(p);
if (!Processed[Pid]) {
if (!TsPayloadStart(p))
p[1] |= TS_ERROR;
else
Processed[Pid] = true;
}
l -= TS_SIZE;
p += TS_SIZE;
}
}
// --- cPatPmtGenerator ------------------------------------------------------
cPatPmtGenerator::cPatPmtGenerator(const cChannel *Channel)
{
numPmtPackets = 0;
patCounter = pmtCounter = 0;
patVersion = pmtVersion = 0;
pmtPid = 0;
esInfoLength = NULL;
SetChannel(Channel);
}
void cPatPmtGenerator::IncCounter(int &Counter, uchar *TsPacket)
{
TsPacket[3] = (TsPacket[3] & 0xF0) | Counter;
if (++Counter > 0x0F)
Counter = 0x00;
}
void cPatPmtGenerator::IncVersion(int &Version)
{
if (++Version > 0x1F)
Version = 0x00;
}
void cPatPmtGenerator::IncEsInfoLength(int Length)
{
if (esInfoLength) {
Length += ((*esInfoLength & 0x0F) << 8) | *(esInfoLength + 1);
*esInfoLength = 0xF0 | (Length >> 8);
*(esInfoLength + 1) = Length;
}
}
int cPatPmtGenerator::MakeStream(uchar *Target, uchar Type, int Pid)
{
int i = 0;
Target[i++] = Type; // stream type
Target[i++] = 0xE0 | (Pid >> 8); // dummy (3), pid hi (5)
Target[i++] = Pid; // pid lo
esInfoLength = &Target[i];
Target[i++] = 0xF0; // dummy (4), ES info length hi
Target[i++] = 0x00; // ES info length lo
return i;
}
int cPatPmtGenerator::MakeAC3Descriptor(uchar *Target, uchar Type)
{
int i = 0;
Target[i++] = Type;
Target[i++] = 0x01; // length
Target[i++] = 0x00;
IncEsInfoLength(i);
return i;
}
int cPatPmtGenerator::MakeSubtitlingDescriptor(uchar *Target, const char *Language, uchar SubtitlingType, uint16_t CompositionPageId, uint16_t AncillaryPageId)
{
int i = 0;
Target[i++] = SI::SubtitlingDescriptorTag;
Target[i++] = 0x08; // length
Target[i++] = *Language++;
Target[i++] = *Language++;
Target[i++] = *Language++;
Target[i++] = SubtitlingType;
Target[i++] = CompositionPageId >> 8;
Target[i++] = CompositionPageId & 0xFF;
Target[i++] = AncillaryPageId >> 8;
Target[i++] = AncillaryPageId & 0xFF;
IncEsInfoLength(i);
return i;
}
int cPatPmtGenerator::MakeLanguageDescriptor(uchar *Target, const char *Language)
{
int i = 0;
Target[i++] = SI::ISO639LanguageDescriptorTag;
int Length = i++;
Target[Length] = 0x00; // length
for (const char *End = Language + strlen(Language); Language < End; ) {
Target[i++] = *Language++;
Target[i++] = *Language++;
Target[i++] = *Language++;
Target[i++] = 0x00; // audio type
Target[Length] += 0x04; // length
if (*Language == '+')
Language++;
}
IncEsInfoLength(i);
return i;
}
int cPatPmtGenerator::MakeCRC(uchar *Target, const uchar *Data, int Length)
{
int crc = SI::CRC32::crc32((const char *)Data, Length, 0xFFFFFFFF);
int i = 0;
Target[i++] = crc >> 24;
Target[i++] = crc >> 16;
Target[i++] = crc >> 8;
Target[i++] = crc;
return i;
}
#define P_TSID 0x8008 // pseudo TS ID
#define P_PMT_PID 0x0084 // pseudo PMT pid
#define MAXPID 0x2000 // the maximum possible number of pids
void cPatPmtGenerator::GeneratePmtPid(const cChannel *Channel)
{
bool Used[MAXPID] = { false };
#define SETPID(p) { if ((p) >= 0 && (p) < MAXPID) Used[p] = true; }
#define SETPIDS(l) { const int *p = l; while (*p) { SETPID(*p); p++; } }
SETPID(Channel->Vpid());
SETPID(Channel->Ppid());
SETPID(Channel->Tpid());
SETPIDS(Channel->Apids());
SETPIDS(Channel->Dpids());
SETPIDS(Channel->Spids());
for (pmtPid = P_PMT_PID; Used[pmtPid]; pmtPid++)
;
}
void cPatPmtGenerator::GeneratePat(void)
{
memset(pat, 0xFF, sizeof(pat));
uchar *p = pat;
int i = 0;
p[i++] = TS_SYNC_BYTE; // TS indicator
p[i++] = TS_PAYLOAD_START | (PATPID >> 8); // flags (3), pid hi (5)
p[i++] = PATPID & 0xFF; // 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)
int SectionLength = i;
p[i++] = 0x00; // section length lo (filled in later)
p[i++] = P_TSID >> 8; // TS id hi
p[i++] = P_TSID & 0xFF; // TS id lo
p[i++] = 0xC1 | (patVersion << 1); // dummy (2), version number (5), current/next indicator (1)
p[i++] = 0x00; // section number
p[i++] = 0x00; // last section number
p[i++] = pmtPid >> 8; // program number hi
p[i++] = pmtPid & 0xFF; // program number lo
p[i++] = 0xE0 | (pmtPid >> 8); // dummy (3), PMT pid hi (5)
p[i++] = pmtPid & 0xFF; // PMT pid lo
pat[SectionLength] = i - SectionLength - 1 + 4; // -2 = SectionLength storage, +4 = length of CRC
MakeCRC(pat + i, pat + PayloadStart, i - PayloadStart);
IncVersion(patVersion);
}
void cPatPmtGenerator::GeneratePmt(const cChannel *Channel)
{
// generate the complete PMT section:
uchar buf[MAX_SECTION_SIZE];
memset(buf, 0xFF, sizeof(buf));
numPmtPackets = 0;
if (Channel) {
int Vpid = Channel->Vpid();
int Ppid = Channel->Ppid();
uchar *p = buf;
int i = 0;
p[i++] = 0x02; // table id
int SectionLength = i;
p[i++] = 0xB0; // section syntax indicator (1), dummy (3), section length hi (4)
p[i++] = 0x00; // section length lo (filled in later)
p[i++] = pmtPid >> 8; // program number hi
p[i++] = pmtPid & 0xFF; // program number lo
p[i++] = 0xC1 | (pmtVersion << 1); // dummy (2), version number (5), current/next indicator (1)
p[i++] = 0x00; // section number
p[i++] = 0x00; // last section number
p[i++] = 0xE0 | (Ppid >> 8); // dummy (3), PCR pid hi (5)
p[i++] = Ppid; // PCR pid lo
p[i++] = 0xF0; // dummy (4), program info length hi (4)
p[i++] = 0x00; // program info length lo
if (Vpid)
i += MakeStream(buf + i, Channel->Vtype(), Vpid);
for (int n = 0; Channel->Apid(n); n++) {
i += MakeStream(buf + i, Channel->Atype(n), Channel->Apid(n));
const char *Alang = Channel->Alang(n);
i += MakeLanguageDescriptor(buf + i, Alang);
}
for (int n = 0; Channel->Dpid(n); n++) {
i += MakeStream(buf + i, 0x06, Channel->Dpid(n));
i += MakeAC3Descriptor(buf + i, Channel->Dtype(n));
i += MakeLanguageDescriptor(buf + i, Channel->Dlang(n));
}
for (int n = 0; Channel->Spid(n); n++) {
i += MakeStream(buf + i, 0x06, Channel->Spid(n));
i += MakeSubtitlingDescriptor(buf + i, Channel->Slang(n), Channel->SubtitlingType(n), Channel->CompositionPageId(n), Channel->AncillaryPageId(n));
}
int sl = i - SectionLength - 2 + 4; // -2 = SectionLength storage, +4 = length of CRC
buf[SectionLength] |= (sl >> 8) & 0x0F;
buf[SectionLength + 1] = sl;
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++] = TS_SYNC_BYTE; // TS indicator
p[j++] = (pusi ? TS_PAYLOAD_START : 0x00) | (pmtPid >> 8); // flags (3), pid hi (5)
p[j++] = pmtPid & 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;
i -= l;
}
IncVersion(pmtVersion);
}
}
void cPatPmtGenerator::SetVersions(int PatVersion, int PmtVersion)
{
patVersion = PatVersion & 0x1F;
pmtVersion = PmtVersion & 0x1F;
}
void cPatPmtGenerator::SetChannel(const cChannel *Channel)
{
if (Channel) {
GeneratePmtPid(Channel);
GeneratePat();
GeneratePmt(Channel);
}
}
uchar *cPatPmtGenerator::GetPat(void)
{
IncCounter(patCounter, pat);
return pat;
}
uchar *cPatPmtGenerator::GetPmt(int &Index)
{
if (Index < numPmtPackets) {
IncCounter(pmtCounter, pmt[Index]);
return pmt[Index++];
}
return NULL;
}
// --- cPatPmtParser ---------------------------------------------------------
cPatPmtParser::cPatPmtParser(bool UpdatePrimaryDevice)
{
updatePrimaryDevice = UpdatePrimaryDevice;
Reset();
}
void cPatPmtParser::Reset(void)
{
pmtSize = 0;
patVersion = pmtVersion = -1;
pmtPid = -1;
vpid = vtype = 0;
ppid = 0;
}
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;
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());
if (patVersion == Pat.getVersionNumber())
return;
SI::PAT::Association assoc;
for (SI::Loop::Iterator it; Pat.associationLoop.getNext(assoc, it); ) {
dbgpatpmt(" isNITPid = %d\n", assoc.isNITPid());
if (!assoc.isNITPid()) {
pmtPid = assoc.getPid();
dbgpatpmt(" service id = %d, pid = %d\n", assoc.getServiceId(), assoc.getPid());
}
}
patVersion = Pat.getVersionNumber();
}
else
esyslog("ERROR: can't parse PAT");
}
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 (PayloadStart) {
pmtSize = 0;
if ((Length -= Data[0] + 1) <= 0)
return;
Data += Data[0] + 1; // this is the first packet
if (SectionLength(Data, Length) > Length) {
if (Length <= int(sizeof(pmt))) {
memcpy(pmt, Data, Length);
pmtSize = Length;
}
else
esyslog("ERROR: PMT packet length too big (%d byte)!", Length);
return;
}
// the packet contains the entire PMT section, so we run into the actual parsing
}
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);
pmtSize += Length;
}
else {
esyslog("ERROR: PMT section length too big (%d byte)!", pmtSize + Length);
pmtSize = 0;
}
if (SectionLength(pmt, pmtSize) > pmtSize)
return; // more packets to come
// 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());
dbgpatpmt(" pcr = %d\n", Pmt.getPCRPid());
if (pmtVersion == Pmt.getVersionNumber())
return;
if (updatePrimaryDevice)
cDevice::PrimaryDevice()->ClrAvailableTracks(false, true);
int NumApids = 0;
int NumDpids = 0;
int NumSpids = 0;
vpid = vtype = 0;
ppid = 0;
apids[0] = 0;
dpids[0] = 0;
spids[0] = 0;
atypes[0] = 0;
dtypes[0] = 0;
SI::PMT::Stream stream;
for (SI::Loop::Iterator it; Pmt.streamLoop.getNext(stream, it); ) {
dbgpatpmt(" stream type = %02X, pid = %d", stream.getStreamType(), stream.getPid());
switch (stream.getStreamType()) {
case 0x01: // STREAMTYPE_11172_VIDEO
case 0x02: // STREAMTYPE_13818_VIDEO
case 0x1B: // MPEG4
vpid = stream.getPid();
vtype = stream.getStreamType();
ppid = Pmt.getPCRPid();
break;
case 0x03: // STREAMTYPE_11172_AUDIO
case 0x04: // STREAMTYPE_13818_AUDIO
case 0x0F: // ISO/IEC 13818-7 Audio with ADTS transport sytax
case 0x11: // ISO/IEC 14496-3 Audio with LATM transport syntax
{
if (NumApids < MAXAPIDS) {
apids[NumApids] = stream.getPid();
atypes[NumApids] = stream.getStreamType();
*alangs[NumApids] = 0;
SI::Descriptor *d;
for (SI::Loop::Iterator it; (d = stream.streamDescriptors.getNext(it)); ) {
switch (d->getDescriptorTag()) {
case SI::ISO639LanguageDescriptorTag: {
SI::ISO639LanguageDescriptor *ld = (SI::ISO639LanguageDescriptor *)d;
SI::ISO639LanguageDescriptor::Language l;
char *s = alangs[NumApids];
int n = 0;
for (SI::Loop::Iterator it; ld->languageLoop.getNext(l, it); ) {
if (*ld->languageCode != '-') { // some use "---" to indicate "none"
dbgpatpmt(" '%s'", l.languageCode);
if (n > 0)
*s++ = '+';
strn0cpy(s, I18nNormalizeLanguageCode(l.languageCode), MAXLANGCODE1);
s += strlen(s);
if (n++ > 1)
break;
}
}
}
break;
default: ;
}
delete d;
}
if (updatePrimaryDevice)
cDevice::PrimaryDevice()->SetAvailableTrack(ttAudio, NumApids, apids[NumApids], alangs[NumApids]);
NumApids++;
apids[NumApids]= 0;
}
}
break;
case 0x06: // STREAMTYPE_13818_PES_PRIVATE
{
int dpid = 0;
int dtype = 0;
char lang[MAXLANGCODE1] = "";
SI::Descriptor *d;
for (SI::Loop::Iterator it; (d = stream.streamDescriptors.getNext(it)); ) {
switch (d->getDescriptorTag()) {
case SI::AC3DescriptorTag:
case SI::EnhancedAC3DescriptorTag:
dbgpatpmt(" AC3");
dpid = stream.getPid();
dtype = d->getDescriptorTag();
break;
case SI::SubtitlingDescriptorTag:
dbgpatpmt(" subtitling");
if (NumSpids < MAXSPIDS) {
spids[NumSpids] = stream.getPid();
*slangs[NumSpids] = 0;
subtitlingTypes[NumSpids] = 0;
compositionPageIds[NumSpids] = 0;
ancillaryPageIds[NumSpids] = 0;
SI::SubtitlingDescriptor *sd = (SI::SubtitlingDescriptor *)d;
SI::SubtitlingDescriptor::Subtitling sub;
char *s = slangs[NumSpids];
int n = 0;
for (SI::Loop::Iterator it; sd->subtitlingLoop.getNext(sub, it); ) {
if (sub.languageCode[0]) {
dbgpatpmt(" '%s'", sub.languageCode);
subtitlingTypes[NumSpids] = sub.getSubtitlingType();
compositionPageIds[NumSpids] = sub.getCompositionPageId();
ancillaryPageIds[NumSpids] = sub.getAncillaryPageId();
if (n > 0)
*s++ = '+';
strn0cpy(s, I18nNormalizeLanguageCode(sub.languageCode), MAXLANGCODE1);
s += strlen(s);
if (n++ > 1)
break;
}
}
if (updatePrimaryDevice)
cDevice::PrimaryDevice()->SetAvailableTrack(ttSubtitle, NumSpids, spids[NumSpids], slangs[NumSpids]);
NumSpids++;
spids[NumSpids]= 0;
}
break;
case SI::ISO639LanguageDescriptorTag: {
SI::ISO639LanguageDescriptor *ld = (SI::ISO639LanguageDescriptor *)d;
dbgpatpmt(" '%s'", ld->languageCode);
strn0cpy(lang, I18nNormalizeLanguageCode(ld->languageCode), MAXLANGCODE1);
}
break;
default: ;
}
delete d;
}
if (dpid) {
if (NumDpids < MAXDPIDS) {
dpids[NumDpids] = dpid;
dtypes[NumDpids] = dtype;
strn0cpy(dlangs[NumDpids], lang, sizeof(dlangs[NumDpids]));
if (updatePrimaryDevice && Setup.UseDolbyDigital)
cDevice::PrimaryDevice()->SetAvailableTrack(ttDolby, NumDpids, dpid, lang);
NumDpids++;
dpids[NumDpids]= 0;
}
}
}
break;
default: ;
}
dbgpatpmt("\n");
if (updatePrimaryDevice) {
cDevice::PrimaryDevice()->EnsureAudioTrack(true);
cDevice::PrimaryDevice()->EnsureSubtitleTrack();
}
}
pmtVersion = Pmt.getVersionNumber();
}
else
esyslog("ERROR: can't parse PMT");
pmtSize = 0;
}
bool cPatPmtParser::GetVersions(int &PatVersion, int &PmtVersion) const
{
PatVersion = patVersion;
PmtVersion = pmtVersion;
return patVersion >= 0 && pmtVersion >= 0;
}
// --- cTsToPes --------------------------------------------------------------
cTsToPes::cTsToPes(void)
{
data = NULL;
size = 0;
Reset();
}
cTsToPes::~cTsToPes()
{
free(data);
}
void cTsToPes::PutTs(const uchar *Data, int Length)
{
if (TsError(Data)) {
Reset();
return; // ignore packets with TEI set, and drop any PES data collected so far
}
if (TsPayloadStart(Data))
Reset();
else if (!size)
return; // skip everything before the first payload start
Length = TsGetPayload(&Data);
if (length + Length > size) {
int NewSize = max(KILOBYTE(2), length + Length);
if (uchar *NewData = (uchar *)realloc(data, NewSize)) {
data = NewData;
size = NewSize;
}
else {
esyslog("ERROR: out of memory");
Reset();
return;
}
}
memcpy(data + length, Data, Length);
length += Length;
}
#define MAXPESLENGTH 0xFFF0
const uchar *cTsToPes::GetPes(int &Length)
{
if (repeatLast) {
repeatLast = false;
Length = lastLength;
return lastData;
}
if (offset < length && PesLongEnough(length)) {
if (!PesHasLength(data)) // this is a video PES packet with undefined length
offset = 6; // trigger setting PES length for initial slice
if (offset) {
uchar *p = data + offset - 6;
if (p != data) {
p -= 3;
memmove(p, data, 4);
}
int l = min(length - offset, MAXPESLENGTH);
offset += l;
if (p != data) {
l += 3;
p[6] = 0x80;
p[7] = 0x00;
p[8] = 0x00;
}
p[4] = l / 256;
p[5] = l & 0xFF;
Length = l + 6;
lastLength = Length;
lastData = p;
return p;
}
else {
Length = PesLength(data);
if (Length <= length) {
offset = Length; // to make sure we break out in case of garbage data
lastLength = Length;
lastData = data;
return data;
}
}
}
return NULL;
}
void cTsToPes::SetRepeatLast(void)
{
repeatLast = true;
}
void cTsToPes::Reset(void)
{
length = offset = 0;
lastData = NULL;
lastLength = 0;
repeatLast = false;
}
// --- Some helper functions for debugging -----------------------------------
void BlockDump(const char *Name, const u_char *Data, int Length)
{
printf("--- %s\n", Name);
for (int i = 0; i < Length; i++) {
if (i && (i % 16) == 0)
printf("\n");
printf(" %02X", Data[i]);
}
printf("\n");
}
void TsDump(const char *Name, const u_char *Data, int Length)
{
printf("%s: %04X", Name, Length);
int n = min(Length, 20);
for (int i = 0; i < n; i++)
printf(" %02X", Data[i]);
if (n < Length) {
printf(" ...");
n = max(n, Length - 10);
for (n = max(n, Length - 10); n < Length; n++)
printf(" %02X", Data[n]);
}
printf("\n");
}
void PesDump(const char *Name, const u_char *Data, int Length)
{
TsDump(Name, Data, Length);
}
// --- cFrameDetector --------------------------------------------------------
#define EMPTY_SCANNER (0xFFFFFFFF)
cFrameDetector::cFrameDetector(int Pid, int Type)
{
SetPid(Pid, Type);
synced = false;
newFrame = independentFrame = false;
numPtsValues = 0;
numIFrames = 0;
framesPerSecond = 0;
framesInPayloadUnit = framesPerPayloadUnit = 0;
scanning = false;
scanner = EMPTY_SCANNER;
}
static int CmpUint32(const void *p1, const void *p2)
{
if (*(uint32_t *)p1 < *(uint32_t *)p2) return -1;
if (*(uint32_t *)p1 > *(uint32_t *)p2) return 1;
return 0;
}
void cFrameDetector::SetPid(int Pid, int Type)
{
pid = Pid;
type = Type;
isVideo = type == 0x01 || type == 0x02 || type == 0x1B; // MPEG 1, 2 or 4
}
void cFrameDetector::Reset(void)
{
newFrame = independentFrame = false;
scanning = false;
scanner = EMPTY_SCANNER;
}
int cFrameDetector::Analyze(const uchar *Data, int Length)
{
int SeenPayloadStart = false;
int Processed = 0;
newFrame = independentFrame = false;
while (Length >= TS_SIZE) {
if (Data[0] != TS_SYNC_BYTE) {
int Skipped = 1;
while (Skipped < Length && (Data[Skipped] != TS_SYNC_BYTE || Length - Skipped > TS_SIZE && Data[Skipped + TS_SIZE] != TS_SYNC_BYTE))
Skipped++;
esyslog("ERROR: skipped %d bytes to sync on start of TS packet", Skipped);
return Processed + Skipped;
}
if (TsHasPayload(Data) && !TsIsScrambled(Data)) {
int Pid = TsPid(Data);
if (Pid == pid) {
if (TsPayloadStart(Data)) {
SeenPayloadStart = true;
if (synced && Processed)
return Processed;
if (Length < MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE)
return Processed; // need more data, in case the frame type is not stored in the first TS packet
if (!framesPerSecond) {
// frame rate unknown, so collect a sequence of PTS values:
if (numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
const uchar *Pes = Data + TsPayloadOffset(Data);
if (PesHasPts(Pes)) {
ptsValues[numPtsValues] = PesGetPts(Pes);
// check for rollover:
if (numPtsValues && ptsValues[numPtsValues - 1] > 0xF0000000 && ptsValues[numPtsValues] < 0x10000000) {
dbgframes("#");
numPtsValues = 0;
numIFrames = 0;
}
else
numPtsValues++;
}
}
else {
// find the smallest PTS delta:
qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
numPtsValues--;
for (int i = 0; i < numPtsValues; i++)
ptsValues[i] = ptsValues[i + 1] - ptsValues[i];
qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
uint32_t Delta = ptsValues[0];
// determine frame info:
if (isVideo) {
if (abs(Delta - 3600) <= 1)
framesPerSecond = 25.0;
else if (Delta % 3003 == 0)
framesPerSecond = 30.0 / 1.001;
else if (abs(Delta - 1800) <= 1)
framesPerSecond = 50.0;
else if (Delta == 1501)
framesPerSecond = 60.0 / 1.001;
else {
framesPerSecond = 25.0;
dsyslog("unknown frame delta (%d), assuming 25 fps", Delta);
}
}
else // audio
framesPerSecond = 90000.0 / Delta; // PTS of audio frames is always increasing
dbgframes("\nDelta = %d FPS = %5.2f FPPU = %d\n", Delta, framesPerSecond, framesPerPayloadUnit);
}
}
scanner = EMPTY_SCANNER;
scanning = true;
}
if (scanning) {
int PayloadOffset = TsPayloadOffset(Data);
if (TsPayloadStart(Data)) {
PayloadOffset += PesPayloadOffset(Data + PayloadOffset);
if (!framesPerPayloadUnit)
framesPerPayloadUnit = framesInPayloadUnit;
if (DebugFrames && !synced)
dbgframes("/");
}
for (int i = PayloadOffset; scanning && i < TS_SIZE; i++) {
scanner <<= 8;
scanner |= Data[i];
switch (type) {
case 0x01: // MPEG 1 video
case 0x02: // MPEG 2 video
if (scanner == 0x00000100) { // Picture Start Code
scanner = EMPTY_SCANNER;
if (synced && !SeenPayloadStart && Processed)
return Processed; // flush everything before this new frame
newFrame = true;
independentFrame = ((Data[i + 2] >> 3) & 0x07) == 1; // I-Frame
if (synced) {
if (framesPerPayloadUnit <= 1)
scanning = false;
}
else {
framesInPayloadUnit++;
if (independentFrame)
numIFrames++;
dbgframes("%d ", (Data[i + 2] >> 3) & 0x07);
}
if (synced)
return Processed + TS_SIZE; // flag this new frame
}
break;
case 0x1B: // MPEG 4 video
if (scanner == 0x00000109) { // Access Unit Delimiter
scanner = EMPTY_SCANNER;
if (synced && !SeenPayloadStart && Processed)
return Processed; // flush everything before this new frame
newFrame = true;
independentFrame = Data[i + 1] == 0x10;
if (synced) {
if (framesPerPayloadUnit <= 1)
scanning = false;
}
else {
framesInPayloadUnit++;
if (independentFrame)
numIFrames++;
dbgframes("%02X ", Data[i + 1]);
}
if (synced)
return Processed + TS_SIZE; // flag this new frame
}
break;
case 0x04: // MPEG audio
case 0x06: // AC3 audio
if (synced && Processed)
return Processed;
newFrame = true;
independentFrame = true;
if (!synced) {
framesInPayloadUnit = 1;
if (TsPayloadStart(Data))
numIFrames++;
}
scanning = false;
break;
default: esyslog("ERROR: unknown stream type %d (PID %d) in frame detector", type, pid);
pid = 0; // let's just ignore any further data
}
}
if (!synced && framesPerSecond && independentFrame) {
synced = true;
dbgframes("*");
Reset();
return Processed + TS_SIZE;
}
}
}
else if (Pid == PATPID && synced && Processed)
return Processed; // allow the caller to see any PAT packets
}
Data += TS_SIZE;
Length -= TS_SIZE;
Processed += TS_SIZE;
}
return Processed;
}
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