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vdr/remux.c
Klaus Schmidinger 7062583ab4 Added support for PGS subtitles
2015-01-14 10:39:55 +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 3.9 2015/01/14 09:57:09 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 MAX_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION 6
#define WRN_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION (MAX_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION / 2)
#define WRN_TS_PACKETS_FOR_FRAME_DETECTOR (MIN_TS_PACKETS_FOR_FRAME_DETECTOR / 2)
#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;
Reset();
}
cTsPayload::cTsPayload(uchar *Data, int Length, int Pid)
{
Setup(Data, Length, Pid);
}
uchar cTsPayload::SetEof(void)
{
length = index; // triggers EOF
return 0x00;
}
void cTsPayload::Reset(void)
{
index = 0;
numPacketsPid = 0;
numPacketsOther = 0;
}
void cTsPayload::Setup(uchar *Data, int Length, int Pid)
{
data = Data;
length = Length;
pid = Pid >= 0 ? Pid : TsPid(Data);
Reset();
}
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 (++numPacketsPid > MAX_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION)
return SetEof();
if (TsHasPayload(p)) {
if (index > 0 && TsPayloadStart(p)) // checking index to not skip the very first TS packet
return SetEof();
index += TsPayloadOffset(p);
break;
}
}
else if (TsPid(p) == PATPID)
return SetEof(); // caller must see PAT packets in case of index regeneration
else
numPacketsOther++;
}
else
return SetEof();
}
}
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;
int OldNumPacketsPid = numPacketsPid;
int OldNumPacketsOther = numPacketsOther;
uint32_t Scanner = EMPTY_SCANNER;
while (!Eof()) {
Scanner = (Scanner << 8) | GetByte();
if (Scanner == Code)
return true;
}
index = OldIndex;
numPacketsPid = OldNumPacketsPid;
numPacketsOther = OldNumPacketsOther;
return false;
}
void cTsPayload::Statistics(void) const
{
if (numPacketsPid + numPacketsOther > WRN_TS_PACKETS_FOR_FRAME_DETECTOR)
dsyslog("WARNING: required (%d+%d) TS packets to determine frame type", numPacketsOther, numPacketsPid);
if (numPacketsPid > WRN_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION)
dsyslog("WARNING: required %d video TS packets to determine frame type", numPacketsPid);
}
// --- 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;
pmtPids[0] = 0;
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;
int NumPmtPids = 0;
SI::PAT::Association assoc;
for (SI::Loop::Iterator it; Pat.associationLoop.getNext(assoc, it); ) {
dbgpatpmt(" isNITPid = %d\n", assoc.isNITPid());
if (!assoc.isNITPid()) {
if (NumPmtPids <= MAX_PMT_PIDS)
pmtPids[NumPmtPids++] = assoc.getPid();
dbgpatpmt(" service id = %d, pid = %d\n", assoc.getServiceId(), assoc.getPid());
}
}
pmtPids[NumPmtPids] = 0;
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: // H.264
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 - AC3 audio for ATSC and BD
case 0x82: // STREAMTYPE_USER_PRIVATE - DTS audio for BD
{
dbgpatpmt(" %s",
stream.getStreamType() == 0x81 ? "AC3" :
stream.getStreamType() == 0x82 ? "DTS" : "");
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;
case 0x90: // PGS subtitles for BD
{
dbgpatpmt(" subtitling");
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);
if (NumSpids < MAXSPIDS) {
spids[NumSpids] = stream.getPid();
*slangs[NumSpids] = 0;
subtitlingTypes[NumSpids] = 0;
compositionPageIds[NumSpids] = 0;
ancillaryPageIds[NumSpids] = 0;
if (updatePrimaryDevice)
cDevice::PrimaryDevice()->SetAvailableTrack(ttSubtitle, NumSpids, stream.getPid(), lang);
NumSpids++;
spids[NumSpids] = 0;
}
}
break;
default: ;
}
delete d;
}
}
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 (IsPmtPid(Pid)) {
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;
int iFrameTemporalReferenceOffset;
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; }
int IFrameTemporalReferenceOffset(void) { return iFrameTemporalReferenceOffset; }
};
cFrameParser::cFrameParser(void)
{
debug = true;
newFrame = false;
independentFrame = false;
iFrameTemporalReferenceOffset = 0;
}
// --- 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;
int lastIFrameTemporalReference;
public:
cMpeg2Parser(void);
virtual int Parse(const uchar *Data, int Length, int Pid);
};
cMpeg2Parser::cMpeg2Parser(void)
{
scanner = EMPTY_SCANNER;
seenIndependentFrame = false;
lastIFrameTemporalReference = -1; // invalid
}
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;
}
uchar b1 = tsPayload.GetByte();
uchar b2 = tsPayload.GetByte();
int TemporalReference = (b1 << 2 ) + ((b2 & 0xC0) >> 6);
uchar FrameType = (b2 >> 3) & 0x07;
if (tsPayload.Find(0x000001B5)) { // Extension start code
if (((tsPayload.GetByte() & 0xF0) >> 4) == 0x08) { // Picture coding extension
tsPayload.GetByte();
uchar PictureStructure = tsPayload.GetByte() & 0x03;
if (PictureStructure == 0x02) // bottom field
break;
}
}
newFrame = true;
independentFrame = FrameType == 1; // I-Frame
if (independentFrame) {
if (lastIFrameTemporalReference >= 0)
iFrameTemporalReferenceOffset = TemporalReference - lastIFrameTemporalReference;
lastIFrameTemporalReference = TemporalReference;
}
if (debug) {
seenIndependentFrame |= independentFrame;
if (seenIndependentFrame) {
static const char FrameTypes[] = "?IPBD???";
dbgframes("%c", FrameTypes[FrameType]);
}
}
tsPayload.Statistics();
break;
}
if (tsPayload.AtPayloadStart() // stop at any new payload start to have the buffer refilled if necessary
|| tsPayload.Eof()) // or if we're out of data
break;
}
return tsPayload.Used();
}
// --- cH264Parser -----------------------------------------------------------
class cH264Parser : 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:
cH264Parser(void);
///< Sets up a new H.264 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);
};
cH264Parser::cH264Parser(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 cH264Parser::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 cH264Parser::GetBit(void)
{
if (bit < 0) {
byte = GetByte();
bit = 7;
}
return (byte & (1 << bit--)) ? 1 : 0;
}
uint32_t cH264Parser::GetBits(int Bits)
{
uint32_t b = 0;
while (Bits--)
b |= GetBit() << Bits;
return b;
}
uint32_t cH264Parser::GetGolombUe(void)
{
int z = -1;
for (int b = 0; !b && z < 32; z++) // limiting z to no get stuck if GetBit() always returns 0
b = GetBit();
return (1 << z) - 1 + GetBits(z);
}
int32_t cH264Parser::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 cH264Parser::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: if (gotAccessUnitDelimiter) {
ParseSequenceParameterSet();
gotSequenceParameterSet = true;
}
break;
case nutCodedSliceNonIdr:
case nutCodedSliceIdr: if (gotAccessUnitDelimiter && gotSequenceParameterSet) {
ParseSliceHeader();
gotAccessUnitDelimiter = false;
if (newFrame)
tsPayload.Statistics();
return tsPayload.Used();
}
break;
default: ;
}
}
if (tsPayload.AtPayloadStart() // stop at any new payload start to have the buffer refilled if necessary
|| tsPayload.Eof()) // or if we're out of data
break;
}
return tsPayload.Used();
}
void cH264Parser::ParseAccessUnitDelimiter(void)
{
if (debug && gotSequenceParameterSet)
dbgframes("A");
GetByte(); // primary_pic_type
}
void cH264Parser::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 cH264Parser::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 H.264
delete parser;
parser = NULL;
if (type == 0x01 || type == 0x02)
parser = new cMpeg2Parser;
else if (type == 0x1B)
parser = new cH264Parser;
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);
int Div = framesPerPayloadUnit;
if (framesPerPayloadUnit > 1)
Div += parser->IFrameTemporalReferenceOffset();
if (Div <= 0)
Div = 1;
uint32_t Delta = ptsValues[0] / Div;
// 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 TRO = %d\n", Delta, framesPerSecond, framesPerPayloadUnit, numPtsValues + 1, parser->IFrameTemporalReferenceOffset());
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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