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vdr/remux.c
Klaus Schmidinger beffcabc81 Version 1.7.32 
VDR developer version 1.7.32 is now available at

       ftp://ftp.tvdr.de/vdr/Developer/vdr-1.7.32.tar.bz2

A 'diff' against the previous version is available at

       ftp://ftp.tvdr.de/vdr/Developer/vdr-1.7.31-1.7.32.diff

MD5 checksums:

068ba78fd427694dcc480fe3b2d07148  vdr-1.7.32.tar.bz2
222f1e9b4d4edaa6fe57286409614cc7  vdr-1.7.31-1.7.32.diff

WARNING:
========

This is a developer version. Even though I use it in my productive
environment. I strongly recommend that you only use it under controlled
conditions and for testing and debugging.

The main focus of this version is on an improved frame detection code,
and improvements to the cutting process. When cutting a recording, VDR
now removes any "dangling" TS packets from the beginning of an editing
sequence and pulls in any "pending" TS packets at the end of a sequence.
It also fixes all timestamps and continuity counters.
However, while the results look much better now in, for instance, Kaffeine,
the TT S2-6400 still shows some video artifacts at the editing points, and
the Mac video player sometimes totally chokes on edited material.
I did spend a lot of time trying to find out what could still be wrong here,
but couldn't come up with any new ideas. So I think it's now time to invite
others to test this new cutting code, read the source code and try to find
out what's still going wrong here. Maybe (hopefully ;-) it's just some stupid
little error... ;-)

From the HISTORY file:
- Pressing the Play key during normal live viewing mode now opens the Recordings menu
  if there is no "last viewed" recording (thanks to Alexander Wenzel).
  The same behavior has been implemented for the Blue key in the main menu.
- cIoThrottle::Engaged() is now also checked in cRemoveDeletedRecordingsThread::Action(),
  to suspend removing deleted recordings in case this is necessary to make room for
  new, ongoing recordings (suggested by Udo Richter).
- The cThread constructor now has an additional boolean parameter that can be set to
  true to have this thread run at a lower priority. Plugin authors that use low
  priority threads may want to use this instead of the calls to SetPriority(19) and
  SetIOPriority(7). The priority of a thread ("low" or "high") is now logged when the
  thread starts.
- Changed DTV_DVBT2_PLP_ID to DTV_STREAM_ID in dvbdevice.c to adapt to an incompatible
  change in DVB API 5.8 (reported by Derek Kelly).
  Removed the meanwhile obsolete definition of FE_CAN_TURBO_FEC.
- Fixed some compiler warnings under gcc version 4.7.1.
- Fixed setting the video format in the dvbhdffdevice (thanks to Torsten Lang).
- Fixed 'make install' to not overwrite existing configuration files (thanks to Peter
  Münster).
- Added including the Make.global and Make.config files to the dvbdhffdevice's
  libhdffcmd/Makefile.
- Added options to build a 32-bit version of VDR on a 64-bit machine to
  Make.config.template.
- Fixed handling VPS timers in case the running status of an event goes to '1' (not
  running) and later goes to '4' (running).
- If a frame position in the 'marks' file of a recording doesn't point to an I-frame,
  it will now be shifted towards the next I-frame, either up or down, whichever is
  closer (suggested by Udo Richter).
- Fixed a possible memory leak in SI::StructureLoop::getNextAsPointer() (reported by
  Sundararaj Reel).
- Fixed handling timers in case an event is modified and "phased out" while the timer
  is recording.
- Improved frame detection by parsing just far enough into the MPEG-4 NAL units to get
  the necessary information about frames and slices.
- The initial syncing of the frame detector is now done immediately after the first
  complete GOP has been seen. This makes recordings and especially pausing live video
  start up to twice as fast as before.
- Updated the Romanian OSD texts (thanks to Lucian Muresan).
- Fixed handling the very last entry in a recording index.
- The return type of cMarks::Add() has been changed to void, since due to the sorting
  of the list of marks the returned pointer might have pointed to a totally different
  mark. Besides, the return value was never actually used.
- Improved editing TS recordings by
  + stripping dangling TS packets from the beginning of a sequence
  + including pending TS packets at the end of a sequence
  + fixing all timestamps and continuity counters
  + generating editing marks for the edited version in such a way that each cutting
    point is marked by an "end" and "begin" mark with the same offset
  + no longer generating an editing mark at the "end" of the edited recording (this
    was actually generated at the beginning of the last GOP, so that a subsequent
    edit would have cut off the last GOP)
  + no longer generating any editing marks if the edited recording results on just
    one single sequence
  + ignoring pairs of editing marks that are placed at exactly the same position of
    a recording when actually cutting the recording
  + not doing anything if the editing marks in place would result in the edited
    version being the same as the original recording
- Editing marks can now be placed directly on top of each other, in which case they
  simply mark a position, but have no effect on the actual cutting process.
- When positioned at an offset where two (or more) editing marks are placed on top
  of each other, the '4' key moves the first one of them to the left, while the '6'
  key moves the last one of them to the right. The '7' and '9' key handle multiple
  marks at the same place as if it were one single mark.
- Modified editing marks are now written to disk whenever the replay progress display
  gets hidden (thanks to Christoph Haubrich).
2012-11-19 00:55:28 +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 2.71 2012/11/18 12:18:08 kls Exp $
*/
#include "remux.h"
#include "device.h"
#include "libsi/si.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
#include "recording.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)
#define EMPTY_SCANNER (0xFFFFFFFF)
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 ------------------------------------------------
void TsHidePayload(uchar *p)
{
p[1] &= ~TS_PAYLOAD_START;
p[3] |= TS_ADAPT_FIELD_EXISTS;
p[3] &= ~TS_PAYLOAD_EXISTS;
p[4] = TS_SIZE - 5;
p[5] = 0x00;
memset(p + 6, 0xFF, TS_SIZE - 6);
}
void TsSetPcr(uchar *p, int64_t Pcr)
{
if (TsHasAdaptationField(p)) {
if (p[4] >= 7 && (p[5] & TS_ADAPT_PCR)) {
int64_t b = Pcr / PCRFACTOR;
int e = Pcr % PCRFACTOR;
p[ 6] = b >> 25;
p[ 7] = b >> 17;
p[ 8] = b >> 9;
p[ 9] = b >> 1;
p[10] = (b << 7) | (p[10] & 0x7E) | ((e >> 8) & 0x01);
p[11] = e;
}
}
}
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;
}
int64_t TsGetDts(const uchar *p, int l)
{
// Find the first packet with a DTS and use it:
while (l > 0) {
const uchar *d = p;
if (TsPayloadStart(d) && TsGetPayload(&d) && PesHasDts(d))
return PesGetDts(d);
p += TS_SIZE;
l -= TS_SIZE;
}
return -1;
}
void TsSetPts(uchar *p, int l, int64_t Pts)
{
// Find the first packet with a PTS and use it:
while (l > 0) {
const uchar *d = p;
if (TsPayloadStart(d) && TsGetPayload(&d) && PesHasPts(d)) {
PesSetPts(const_cast<uchar *>(d), Pts);
return;
}
p += TS_SIZE;
l -= TS_SIZE;
}
}
void TsSetDts(uchar *p, int l, int64_t Dts)
{
// Find the first packet with a DTS and use it:
while (l > 0) {
const uchar *d = p;
if (TsPayloadStart(d) && TsGetPayload(&d) && PesHasDts(d)) {
PesSetDts(const_cast<uchar *>(d), Dts);
return;
}
p += TS_SIZE;
l -= TS_SIZE;
}
}
// --- Some PES handling tools -----------------------------------------------
void PesSetPts(uchar *p, int64_t Pts)
{
p[ 9] = ((Pts >> 29) & 0x0E) | (p[9] & 0xF1);
p[10] = Pts >> 22;
p[11] = ((Pts >> 14) & 0xFE) | 0x01;
p[12] = Pts >> 7;
p[13] = ((Pts << 1) & 0xFE) | 0x01;
}
void PesSetDts(uchar *p, int64_t Dts)
{
p[14] = ((Dts >> 29) & 0x0E) | (p[14] & 0xF1);
p[15] = Dts >> 22;
p[16] = ((Dts >> 14) & 0xFE) | 0x01;
p[17] = Dts >> 7;
p[18] = ((Dts << 1) & 0xFE) | 0x01;
}
int64_t PtsDiff(int64_t Pts1, int64_t Pts2)
{
int64_t d = Pts2 - Pts1;
if (d > MAX33BIT / 2)
return d - (MAX33BIT + 1);
if (d < -MAX33BIT / 2)
return d + (MAX33BIT + 1);
return d;
}
// --- cTsPayload ------------------------------------------------------------
cTsPayload::cTsPayload(void)
{
data = NULL;
length = 0;
pid = -1;
index = 0;
}
cTsPayload::cTsPayload(uchar *Data, int Length, int Pid)
{
Setup(Data, Length, Pid);
}
void cTsPayload::Setup(uchar *Data, int Length, int Pid)
{
data = Data;
length = Length;
pid = Pid >= 0 ? Pid : TsPid(Data);
index = 0;
}
uchar cTsPayload::GetByte(void)
{
if (!Eof()) {
if (index % TS_SIZE == 0) { // encountered the next TS header
for (;; index += TS_SIZE) {
if (data[index] == TS_SYNC_BYTE && index + TS_SIZE <= length) { // to make sure we are at a TS header start and drop incomplete TS packets at the end
uchar *p = data + index;
if (TsPid(p) == pid) { // only handle TS packets for the initial PID
if (TsHasPayload(p)) {
if (index > 0 && TsPayloadStart(p)) { // checking index to not skip the very first TS packet
length = index; // triggers EOF
return 0x00;
}
index += TsPayloadOffset(p);
break;
}
}
}
else {
length = index; // triggers EOF
return 0x00;
}
}
}
return data[index++];
}
return 0x00;
}
bool cTsPayload::SkipBytes(int Bytes)
{
while (Bytes-- > 0)
GetByte();
return !Eof();
}
bool cTsPayload::SkipPesHeader(void)
{
return SkipBytes(PesPayloadOffset(data + TsPayloadOffset(data)));
}
int cTsPayload::GetLastIndex(void)
{
return index - 1;
}
void cTsPayload::SetByte(uchar Byte, int Index)
{
if (Index >= 0 && Index < length)
data[Index] = Byte;
}
bool cTsPayload::Find(uint32_t Code)
{
int OldIndex = index;
uint32_t Scanner = EMPTY_SCANNER;
while (!Eof()) {
Scanner = (Scanner << 8) | GetByte();
if (Scanner == Code)
return true;
}
index = OldIndex;
return false;
}
// --- 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 syntax
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;
case 0x81: // STREAMTYPE_USER_PRIVATE
{
dbgpatpmt(" AC3");
char lang[MAXLANGCODE1] = { 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;
dbgpatpmt(" '%s'", ld->languageCode);
strn0cpy(lang, I18nNormalizeLanguageCode(ld->languageCode), MAXLANGCODE1);
}
break;
default: ;
}
delete d;
}
if (NumDpids < MAXDPIDS) {
dpids[NumDpids] = stream.getPid();
dtypes[NumDpids] = SI::AC3DescriptorTag;
strn0cpy(dlangs[NumDpids], lang, sizeof(dlangs[NumDpids]));
if (updatePrimaryDevice && Setup.UseDolbyDigital)
cDevice::PrimaryDevice()->SetAvailableTrack(ttDolby, NumDpids, stream.getPid(), 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::ParsePatPmt(const uchar *Data, int Length)
{
while (Length >= TS_SIZE) {
if (*Data != TS_SYNC_BYTE)
break; // just for safety
int Pid = TsPid(Data);
if (Pid == PATPID)
ParsePat(Data, TS_SIZE);
else if (Pid == PmtPid()) {
ParsePmt(Data, TS_SIZE);
if (patVersion >= 0 && pmtVersion >= 0)
return true;
}
Data += TS_SIZE;
Length -= TS_SIZE;
}
return false;
}
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;
if (p < data) {
Reset();
return NULL;
}
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);
}
// --- cFrameParser ----------------------------------------------------------
class cFrameParser {
protected:
bool debug;
bool newFrame;
bool independentFrame;
public:
cFrameParser(void);
virtual ~cFrameParser() {};
virtual int Parse(const uchar *Data, int Length, int Pid) = 0;
///< Parses the given Data, which is a sequence of Length bytes of TS packets.
///< The payload in the TS packets with the given Pid is searched for just
///< enough information to determine the beginning and type of the next video
///< frame.
///< Returns the number of bytes parsed. Upon return, the functions NewFrame()
///< and IndependentFrame() can be called to retrieve the required information.
void SetDebug(bool Debug) { debug = Debug; }
bool NewFrame(void) { return newFrame; }
bool IndependentFrame(void) { return independentFrame; }
};
cFrameParser::cFrameParser(void)
{
debug = true;
newFrame = false;
independentFrame = false;
}
// --- cAudioParser ----------------------------------------------------------
class cAudioParser : public cFrameParser {
public:
cAudioParser(void);
virtual int Parse(const uchar *Data, int Length, int Pid);
};
cAudioParser::cAudioParser(void)
{
}
int cAudioParser::Parse(const uchar *Data, int Length, int Pid)
{
if (TsPayloadStart(Data)) {
newFrame = independentFrame = true;
if (debug)
dbgframes("/");
}
else
newFrame = independentFrame = false;
return TS_SIZE;
}
// --- cMpeg2Parser ----------------------------------------------------------
class cMpeg2Parser : public cFrameParser {
private:
uint32_t scanner;
bool seenIndependentFrame;
public:
cMpeg2Parser(void);
virtual int Parse(const uchar *Data, int Length, int Pid);
};
cMpeg2Parser::cMpeg2Parser(void)
{
scanner = EMPTY_SCANNER;
seenIndependentFrame = false;
}
int cMpeg2Parser::Parse(const uchar *Data, int Length, int Pid)
{
newFrame = independentFrame = false;
bool SeenPayloadStart = false;
cTsPayload tsPayload(const_cast<uchar *>(Data), Length, Pid);
if (TsPayloadStart(Data)) {
SeenPayloadStart = true;
tsPayload.SkipPesHeader();
scanner = EMPTY_SCANNER;
if (debug && seenIndependentFrame)
dbgframes("/");
}
uint32_t OldScanner = scanner; // need to remember it in case of multiple frames per payload
for (;;) {
if (!SeenPayloadStart && tsPayload.AtTsStart())
OldScanner = scanner;
scanner = (scanner << 8) | tsPayload.GetByte();
if (scanner == 0x00000100) { // Picture Start Code
if (!SeenPayloadStart && tsPayload.GetLastIndex() > TS_SIZE) {
scanner = OldScanner;
return tsPayload.Used() - TS_SIZE;
}
newFrame = true;
tsPayload.GetByte();
uchar FrameType = (tsPayload.GetByte() >> 3) & 0x07;
independentFrame = FrameType == 1; // I-Frame
if (debug) {
seenIndependentFrame |= independentFrame;
if (seenIndependentFrame) {
static const char FrameTypes[] = "?IPBD???";
dbgframes("%c", FrameTypes[FrameType]);
}
}
break;
}
if (tsPayload.AtPayloadStart() // stop at any new payload start to have the buffer refilled if necessary
|| (tsPayload.Available() < MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE // stop if the available data is below the limit...
&& (tsPayload.Available() <= 0 || tsPayload.AtTsStart()))) // ...but only if there is no more data at all, or if we are at a TS boundary
break;
}
return tsPayload.Used();
}
// --- cMpeg4Parser ----------------------------------------------------------
class cMpeg4Parser : public cFrameParser {
private:
enum eNalUnitType {
nutCodedSliceNonIdr = 1,
nutCodedSliceIdr = 5,
nutSequenceParameterSet = 7,
nutAccessUnitDelimiter = 9,
};
cTsPayload tsPayload;
uchar byte; // holds the current byte value in case of bitwise access
int bit; // the bit index into the current byte (-1 if we're not in bit reading mode)
int zeroBytes; // the number of consecutive zero bytes (to detect 0x000003)
uint32_t scanner;
// Identifiers written in '_' notation as in "ITU-T H.264":
bool separate_colour_plane_flag;
int log2_max_frame_num;
bool frame_mbs_only_flag;
//
bool gotAccessUnitDelimiter;
bool gotSequenceParameterSet;
uchar GetByte(bool Raw = false);
///< Gets the next data byte. If Raw is true, no filtering will be done.
///< With Raw set to false, if the byte sequence 0x000003 is encountered,
///< the byte with 0x03 will be skipped.
uchar GetBit(void);
uint32_t GetBits(int Bits);
uint32_t GetGolombUe(void);
int32_t GetGolombSe(void);
void ParseAccessUnitDelimiter(void);
void ParseSequenceParameterSet(void);
void ParseSliceHeader(void);
public:
cMpeg4Parser(void);
///< Sets up a new MPEG-4 parser.
///< This class parses only the data absolutely necessary to determine the
///< frame borders and field count of the given H264 material.
virtual int Parse(const uchar *Data, int Length, int Pid);
};
cMpeg4Parser::cMpeg4Parser(void)
{
byte = 0;
bit = -1;
zeroBytes = 0;
scanner = EMPTY_SCANNER;
separate_colour_plane_flag = false;
log2_max_frame_num = 0;
frame_mbs_only_flag = false;
gotAccessUnitDelimiter = false;
gotSequenceParameterSet = false;
}
uchar cMpeg4Parser::GetByte(bool Raw)
{
uchar b = tsPayload.GetByte();
if (!Raw) {
// If we encounter the byte sequence 0x000003, we need to skip the 0x03:
if (b == 0x00)
zeroBytes++;
else {
if (b == 0x03 && zeroBytes >= 2)
b = tsPayload.GetByte();
zeroBytes = 0;
}
}
else
zeroBytes = 0;
bit = -1;
return b;
}
uchar cMpeg4Parser::GetBit(void)
{
if (bit < 0) {
byte = GetByte();
bit = 7;
}
return (byte & (1 << bit--)) ? 1 : 0;
}
uint32_t cMpeg4Parser::GetBits(int Bits)
{
uint32_t b = 0;
while (Bits--)
b |= GetBit() << Bits;
return b;
}
uint32_t cMpeg4Parser::GetGolombUe(void)
{
int z = -1;
for (int b = 0; !b; z++)
b = GetBit();
return (1 << z) - 1 + GetBits(z);
}
int32_t cMpeg4Parser::GetGolombSe(void)
{
uint32_t v = GetGolombUe();
if (v) {
if ((v & 0x01) != 0)
return (v + 1) / 2; // fails for v == 0xFFFFFFFF, but that will probably never happen
else
return -int32_t(v / 2);
}
return v;
}
int cMpeg4Parser::Parse(const uchar *Data, int Length, int Pid)
{
newFrame = independentFrame = false;
tsPayload.Setup(const_cast<uchar *>(Data), Length, Pid);
if (TsPayloadStart(Data)) {
tsPayload.SkipPesHeader();
scanner = EMPTY_SCANNER;
if (debug && gotSequenceParameterSet) {
dbgframes("/");
}
}
for (;;) {
scanner = (scanner << 8) | GetByte(true);
if ((scanner & 0xFFFFFF00) == 0x00000100) { // NAL unit start
uchar NalUnitType = scanner & 0x1F;
switch (NalUnitType) {
case nutAccessUnitDelimiter: ParseAccessUnitDelimiter();
gotAccessUnitDelimiter = true;
break;
case nutSequenceParameterSet: ParseSequenceParameterSet();
gotSequenceParameterSet = true;
break;
case nutCodedSliceNonIdr:
case nutCodedSliceIdr: if (gotAccessUnitDelimiter && gotSequenceParameterSet) {
ParseSliceHeader();
gotAccessUnitDelimiter = false;
return tsPayload.Used();
}
break;
default: ;
}
}
if (tsPayload.AtPayloadStart() // stop at any new payload start to have the buffer refilled if necessary
|| (tsPayload.Available() < MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE // stop if the available data is below the limit...
&& (tsPayload.Available() <= 0 || tsPayload.AtTsStart()))) // ...but only if there is no more data at all, or if we are at a TS boundary
break;
}
return tsPayload.Used();
}
void cMpeg4Parser::ParseAccessUnitDelimiter(void)
{
if (debug && gotSequenceParameterSet)
dbgframes("A");
GetByte(); // primary_pic_type
}
void cMpeg4Parser::ParseSequenceParameterSet(void)
{
uchar profile_idc = GetByte(); // profile_idc
GetByte(); // constraint_set[0-5]_flags, reserved_zero_2bits
GetByte(); // level_idc
GetGolombUe(); // seq_parameter_set_id
if (profile_idc == 100 || profile_idc == 110 || profile_idc == 122 || profile_idc == 244 || profile_idc == 44 || profile_idc == 83 || profile_idc == 86 || profile_idc ==118 || profile_idc == 128) {
int chroma_format_idc = GetGolombUe(); // chroma_format_idc
if (chroma_format_idc == 3)
separate_colour_plane_flag = GetBit();
GetGolombUe(); // bit_depth_luma_minus8
GetGolombUe(); // bit_depth_chroma_minus8
GetBit(); // qpprime_y_zero_transform_bypass_flag
if (GetBit()) { // seq_scaling_matrix_present_flag
for (int i = 0; i < ((chroma_format_idc != 3) ? 8 : 12); i++) {
if (GetBit()) { // seq_scaling_list_present_flag
int SizeOfScalingList = (i < 6) ? 16 : 64;
int LastScale = 8;
int NextScale = 8;
for (int j = 0; j < SizeOfScalingList; j++) {
if (NextScale)
NextScale = (LastScale + GetGolombSe() + 256) % 256; // delta_scale
if (NextScale)
LastScale = NextScale;
}
}
}
}
}
log2_max_frame_num = GetGolombUe() + 4; // log2_max_frame_num_minus4
int pic_order_cnt_type = GetGolombUe(); // pic_order_cnt_type
if (pic_order_cnt_type == 0)
GetGolombUe(); // log2_max_pic_order_cnt_lsb_minus4
else if (pic_order_cnt_type == 1) {
GetBit(); // delta_pic_order_always_zero_flag
GetGolombSe(); // offset_for_non_ref_pic
GetGolombSe(); // offset_for_top_to_bottom_field
for (int i = GetGolombUe(); i--; ) // num_ref_frames_in_pic_order_cnt_cycle
GetGolombSe(); // offset_for_ref_frame
}
GetGolombUe(); // max_num_ref_frames
GetBit(); // gaps_in_frame_num_value_allowed_flag
GetGolombUe(); // pic_width_in_mbs_minus1
GetGolombUe(); // pic_height_in_map_units_minus1
frame_mbs_only_flag = GetBit(); // frame_mbs_only_flag
if (debug) {
if (gotAccessUnitDelimiter && !gotSequenceParameterSet)
dbgframes("A"); // just for completeness
dbgframes(frame_mbs_only_flag ? "S" : "s");
}
}
void cMpeg4Parser::ParseSliceHeader(void)
{
newFrame = true;
GetGolombUe(); // first_mb_in_slice
int slice_type = GetGolombUe(); // slice_type, 0 = P, 1 = B, 2 = I, 3 = SP, 4 = SI
independentFrame = (slice_type % 5) == 2;
if (debug) {
static const char SliceTypes[] = "PBIpi";
dbgframes("%c", SliceTypes[slice_type % 5]);
}
if (frame_mbs_only_flag)
return; // don't need the rest - a frame is complete
GetGolombUe(); // pic_parameter_set_id
if (separate_colour_plane_flag)
GetBits(2); // colour_plane_id
GetBits(log2_max_frame_num); // frame_num
if (!frame_mbs_only_flag) {
if (GetBit()) // field_pic_flag
newFrame = !GetBit(); // bottom_field_flag
if (debug)
dbgframes(newFrame ? "t" : "b");
}
}
// --- cFrameDetector --------------------------------------------------------
cFrameDetector::cFrameDetector(int Pid, int Type)
{
parser = NULL;
SetPid(Pid, Type);
synced = false;
newFrame = independentFrame = false;
numPtsValues = 0;
numIFrames = 0;
framesPerSecond = 0;
framesInPayloadUnit = framesPerPayloadUnit = 0;
scanning = false;
}
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
delete parser;
parser = NULL;
if (type == 0x01 || type == 0x02)
parser = new cMpeg2Parser;
else if (type == 0x1B)
parser = new cMpeg4Parser;
else if (type == 0x04 || type == 0x06) // MPEG audio or AC3 audio
parser = new cAudioParser;
else if (type != 0)
esyslog("ERROR: unknown stream type %d (PID %d) in frame detector", type, pid);
}
int cFrameDetector::Analyze(const uchar *Data, int Length)
{
if (!parser)
return 0;
int Processed = 0;
newFrame = independentFrame = false;
while (Length >= MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE) { // makes sure we are looking at enough data, in case the frame type is not stored in the first TS packet
// Sync on TS packet borders:
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;
}
// Handle one TS packet:
int Handled = TS_SIZE;
if (TsHasPayload(Data) && !TsIsScrambled(Data)) {
int Pid = TsPid(Data);
if (Pid == pid) {
if (Processed)
return Processed;
if (TsPayloadStart(Data))
scanning = true;
if (scanning) {
// Detect the beginning of a new frame:
if (TsPayloadStart(Data)) {
if (!framesPerPayloadUnit)
framesPerPayloadUnit = framesInPayloadUnit;
}
int n = parser->Parse(Data, Length, pid);
if (n > 0) {
if (parser->NewFrame()) {
newFrame = true;
independentFrame = parser->IndependentFrame();
if (synced) {
if (framesPerPayloadUnit <= 1)
scanning = false;
}
else {
framesInPayloadUnit++;
if (independentFrame)
numIFrames++;
}
}
Handled = n;
}
}
if (TsPayloadStart(Data)) {
// Determine the frame rate from the PTS values in the PES headers:
if (framesPerSecond <= 0.0) {
// frame rate unknown, so collect a sequence of PTS values:
if (numPtsValues < 2 || numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
if (newFrame) { // only take PTS values at the beginning of a frame (in case if fields!)
const uchar *Pes = Data + TsPayloadOffset(Data);
if (numIFrames && 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++;
}
}
}
if (numPtsValues >= 2 && numIFrames >= 2) {
// 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] / framesPerPayloadUnit;
// 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 = DEFAULTFRAMESPERSECOND;
dsyslog("unknown frame delta (%d), assuming %5.2f fps", Delta, DEFAULTFRAMESPERSECOND);
}
}
else // audio
framesPerSecond = double(PTSTICKS) / Delta; // PTS of audio frames is always increasing
dbgframes("\nDelta = %d FPS = %5.2f FPPU = %d NF = %d\n", Delta, framesPerSecond, framesPerPayloadUnit, numPtsValues + 1);
synced = true;
parser->SetDebug(false);
}
}
}
}
else if (Pid == PATPID && synced && Processed)
return Processed; // allow the caller to see any PAT packets
}
Data += Handled;
Length -= Handled;
Processed += Handled;
if (newFrame)
break;
}
return Processed;
}
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