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e36fe18c48
vdr/remux.c
Klaus Schmidinger e36fe18c48 Version 1.3.19 
- Making sure at least the default skin is available at program start in case a
  plugin needs to issue an error message (thanks to Achim Tuffentshammer for
  reporting a crash in such a case). Also checking if there is a current skin
  in cSkins::Message().
- Completed the Finnish OSD texts and fixed internationalization of the text
  for "Setup/DVB/Audio language(s)" (thanks to Rolf Ahrenberg).
- Completed the Estonian OSD texts and switched to iso8859-13 character set
  (thanks to Arthur Konovalov).
- Made cCondWait::SleepMs() sleep at least 3ms to avoid a possible busy wait.
- Fixed canceling the LIRC thread (thanks to Marco Schlüßler for pointing out
  this one).
- The "Green" button in the "Main" menu is now always "Audio", since the audio
  channel might be changed even if there is only one actual audio PID.
- Fixed handling the '-E' option which was broken in version 1.3.18 (thanks to
  Christian Jacobsen for reporting this one).
- Added 'channels.conf.terr' entries for Mainz (thanks to Michael Heyse).
- Implemented cDolbyRepacker for better handling of Dolby Digital PES packets
  (thanks to Reinhard Nissl).
- Fixed playing files with PES packets longer than 2048 byte through the full
  featured DVB card (thanks to Marco Kremer for reporting this one and providing
  a test sample).
- Recording and Transfer Mode now handle more than 2 audio PIDs. For this the
  interfaces of the following functions have been changed:
  cTransferControl::cTransferControl()
  cTransfer::cTransfer()
  cRecorder::cRecorder()
  cReceiver::cReceiver()
  cRemux::cRemux()
- Fixed a possible race condition in cDevice::Action() and cTSBuffer::Action()
  (thanks to Stefan Huelswitt).
- Extended some buffer sizes to allow handling HDTV streams (thanks to Reinhard
  Nissl).
- Added 'channels.conf.terr' entries for Düsseldorf and Köln (thanks to Walter Koch).
- Falling back to 'stereo' when switching channels in case the user had switched
  to 'left' or 'right' (suggested by Rolf Groppe).
- Completed the Danish OSD texts (thanks to Mogens Elneff).
- Recording and Transfer Mode can now handle up to 8 Dolby Digital tracks (thanks
  to Marco Schlüßler for a patch that implements substream handling into
  cDevice::PlayPesPacket(), and Reinhard Nissl for adding substream handling to
  cDolbyRepacker).
- Added PlayPes(NULL, 0) to cTransfer::Action() when clearing the transfer buffer
  to avoid overflows (thanks to Marco Schlüßler for pointing this out).
2005-01-23 18:00:00 +01:00

969 lines
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/*
* remux.c: A streaming MPEG2 remultiplexer
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* The parts of this code that implement cTS2PES have been taken from
* the Linux DVB driver's 'tuxplayer' example and were rewritten to suit
* VDR's needs.
*
* The cDolbyRepacker code was originally written by Reinhard Nissl <rnissl@gmx.de>,
* and adapted to the VDR coding style by Klaus.Schmidinger@cadsoft.de.
*
* $Id: remux.c 1.27 2005/01/23 12:56:39 kls Exp $
*/
#include "remux.h"
#include <stdlib.h>
#include "channels.h"
#include "thread.h"
#include "tools.h"
// --- cRepacker -------------------------------------------------------------
class cRepacker {
protected:
uint8_t subStreamId;
public:
cRepacker(void) { subStreamId = 0; }
virtual ~cRepacker() {}
virtual int Put(cRingBufferLinear *ResultBuffer, const uchar *Data, int Count) = 0;
virtual int BreakAt(const uchar *Data, int Count) = 0;
void SetSubStreamId(uint8_t SubStreamId) { subStreamId = SubStreamId; }
};
// --- cDolbyRepacker --------------------------------------------------------
class cDolbyRepacker : public cRepacker {
private:
static int frameSizes[];
uchar fragmentData[6 + 65535];
int fragmentLen;
uchar pesHeader[6 + 3 + 255 + 4 + 4];
int pesHeaderLen;
uchar chk1;
uchar chk2;
int ac3todo;
enum {
find_0b,
find_77,
store_chk1,
store_chk2,
get_length
} state;
void Reset(void);
public:
cDolbyRepacker(void);
virtual int Put(cRingBufferLinear *ResultBuffer, const uchar *Data, int Count);
virtual int BreakAt(const uchar *Data, int Count);
};
int cDolbyRepacker::frameSizes[] = {
// fs = 48 kHz
64, 64, 80, 80, 96, 96, 112, 112, 128, 128, 160, 160, 192, 192, 224, 224,
256, 256, 320, 320, 384, 384, 448, 448, 512, 512, 640, 640, 768, 768, 896, 896,
1024, 1024, 1152, 1152, 1280, 1280, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// fs = 44.1 kHz
69, 70, 87, 88, 104, 105, 121, 122, 139, 140, 174, 175, 208, 209, 243, 244,
278, 279, 348, 349, 417, 418, 487, 488, 557, 558, 696, 697, 835, 836, 975, 976,
1114, 1115, 1253, 1254, 1393, 1394, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// fs = 32 kHz
96, 96, 120, 120, 144, 144, 168, 168, 192, 192, 240, 240, 288, 288, 336, 336,
384, 384, 480, 480, 576, 576, 672, 672, 768, 768, 960, 960, 1152, 1152, 1344, 1344,
1536, 1536, 1728, 1728, 1920, 1920, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
//
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
cDolbyRepacker::cDolbyRepacker(void)
{
pesHeader[0] = 0x00;
pesHeader[1] = 0x00;
pesHeader[2] = 0x01;
pesHeader[3] = 0xBD;
pesHeader[4] = 0x00;
pesHeader[5] = 0x00;
Reset();
}
void cDolbyRepacker::Reset()
{
state = find_0b;
pesHeader[6] = 0x80;
pesHeader[7] = 0x00;
pesHeader[8] = 0x00;
pesHeaderLen = 9;
ac3todo = 0;
chk1 = 0;
chk2 = 0;
fragmentLen = 0;
}
int cDolbyRepacker::Put(cRingBufferLinear *ResultBuffer, const uchar *Data, int Count)
{
// check for MPEG 2
if ((Data[6] & 0xC0) != 0x80)
return 0;
// copy header information for later use
if (Data[6] != 0x80 || Data[7] != 0x00 || Data[8] != 0x00) {
pesHeaderLen = Data[8] + 6 + 3;
memcpy(pesHeader, Data, pesHeaderLen);
}
const uchar *data = Data + pesHeaderLen;
int done = pesHeaderLen;
int todo = Count - done;
// finish remainder of ac3 frame
if (ac3todo > 0) {
int bite;
// enough data available to put PES packet into buffer?
if (ac3todo <= todo) {
// output a previous fragment first
if (fragmentLen > 0) {
bite = fragmentLen;
int n = ResultBuffer->Put(fragmentData, bite);
if (bite != n) {
Reset();
return done;
}
fragmentLen = 0;
}
bite = ac3todo;
int n = ResultBuffer->Put(data, bite);
if (bite != n) {
Reset();
return done + n;
}
}
else {
// copy the fragment into separate buffer for later processing
bite = todo;
if (fragmentLen + bite > (int)sizeof(fragmentData)) {
Reset();
return done;
}
memcpy(fragmentData + fragmentLen, data, bite);
fragmentLen += bite;
}
data += bite;
done += bite;
todo -= bite;
ac3todo -= bite;
}
// look for 0x0B 0x77 <chk1> <chk2> <frameSize>
while (todo > 0) {
switch (state) {
case find_0b:
if (*data == 0x0B)
++(int &)state;
data++;
done++;
todo--;
continue;
case find_77:
if (*data != 0x77) {
state = find_0b;
continue;
}
data++;
done++;
todo--;
++(int &)state;
continue;
case store_chk1:
chk1 = *data++;
done++;
todo--;
++(int &)state;
continue;
case store_chk2:
chk2 = *data++;
done++;
todo--;
++(int &)state;
continue;
case get_length: {
ac3todo = 2 * frameSizes[*data];
// frameSizeCode was invalid => restart searching
if (ac3todo <= 0) {
if (chk1 == 0x0B) {
if (chk2 == 0x77) {
state = store_chk1;
continue;
}
if (chk2 == 0x0B) {
state = find_77;
continue;
}
state = find_0b;
continue;
}
if (chk2 == 0x0B) {
state = find_77;
continue;
}
state = find_0b;
continue;
}
// adjust PES packet length and output packet
if (subStreamId) {
pesHeader[pesHeaderLen++] = subStreamId;
pesHeader[pesHeaderLen++] = 0x00;
pesHeader[pesHeaderLen++] = 0x00;
pesHeader[pesHeaderLen++] = 0x00;
}
int packetLen = pesHeaderLen - 6 + ac3todo;
pesHeader[4] = packetLen >> 8;
pesHeader[5] = packetLen & 0xFF;
pesHeader[pesHeaderLen + 0] = 0x0B;
pesHeader[pesHeaderLen + 1] = 0x77;
pesHeader[pesHeaderLen + 2] = chk1;
pesHeader[pesHeaderLen + 3] = chk2;
ac3todo -= 4;
int bite = pesHeaderLen + 4;
// enough data available to put PES packet into buffer?
if (ac3todo <= todo) {
int n = ResultBuffer->Put(pesHeader, bite);
if (bite != n) {
Reset();
return done;
}
bite = ac3todo;
n = ResultBuffer->Put(data, bite);
if (bite != n) {
Reset();
return done + n;
}
}
else {
// copy the fragment into separate buffer for later processing
if (fragmentLen + bite > (int)sizeof(fragmentData)) {
Reset();
return done;
}
memcpy(fragmentData + fragmentLen, pesHeader, bite);
fragmentLen += bite;
bite = todo;
if (fragmentLen + bite > (int)sizeof(fragmentData)) {
Reset();
return done;
}
memcpy(fragmentData + fragmentLen, data, bite);
fragmentLen += bite;
}
data += bite;
done += bite;
todo -= bite;
ac3todo -= bite;
// prepare for next packet
pesHeader[6] = 0x80;
pesHeader[7] = 0x00;
pesHeader[8] = 0x00;
pesHeaderLen = 9;
state = find_0b;
}
}
}
return Count;
}
int cDolbyRepacker::BreakAt(const uchar *Data, int Count)
{
// enough data for test?
if (Count < 6 + 3)
return -1;
// check for MPEG 2
if ((Data[6] & 0xC0) != 0x80)
return -1;
int headerLen = Data[8] + 6 + 3;
// break after fragment tail?
if (ac3todo > 0)
return headerLen + ac3todo;
// enough data for test?
if (Count < headerLen + 5)
return -1;
const uchar *data = Data + headerLen;
// break after ac3 frame?
if (data[0] == 0x0B && data[1] == 0x77 && frameSizes[data[4]] > 0)
return headerLen + frameSizes[data[4]];
return -1;
}
// --- cTS2PES ---------------------------------------------------------------
#include <netinet/in.h>
//XXX TODO: these should really be available in some driver header file!
#define PROG_STREAM_MAP 0xBC
#ifndef PRIVATE_STREAM1
#define PRIVATE_STREAM1 0xBD
#endif
#define PADDING_STREAM 0xBE
#ifndef PRIVATE_STREAM2
#define PRIVATE_STREAM2 0xBF
#endif
#define AUDIO_STREAM_S 0xC0
#define AUDIO_STREAM_E 0xDF
#define VIDEO_STREAM_S 0xE0
#define VIDEO_STREAM_E 0xEF
#define ECM_STREAM 0xF0
#define EMM_STREAM 0xF1
#define DSM_CC_STREAM 0xF2
#define ISO13522_STREAM 0xF3
#define PROG_STREAM_DIR 0xFF
//pts_dts flags
#define PTS_ONLY 0x80
#define TS_SIZE 188
#define PID_MASK_HI 0x1F
#define CONT_CNT_MASK 0x0F
// Flags:
#define PAY_START 0x40
#define TS_ERROR 0x80
#define ADAPT_FIELD 0x20
#define MAX_PLENGTH 0xFFFF // the maximum PES packet length (theoretically)
#define MMAX_PLENGTH (64*MAX_PLENGTH) // some stations send PES packets that are extremely large, e.g. DVB-T in Finland or HDTV 1920x1080
#define IPACKS 2048
// Start codes:
#define SC_PICTURE 0x00 // "picture header"
#define MAXNONUSEFULDATA (10*1024*1024)
#define MAXNUMUPTERRORS 10
class cTS2PES {
private:
int pid;
int size;
int found;
int count;
uint8_t *buf;
uint8_t cid;
uint8_t audioCid;
uint8_t subStreamId;
int plength;
uint8_t plen[2];
uint8_t flag1;
uint8_t flag2;
uint8_t hlength;
int mpeg;
uint8_t check;
int which;
bool done;
cRingBufferLinear *resultBuffer;
int tsErrors;
int ccErrors;
int ccCounter;
cRepacker *repacker;
static uint8_t headr[];
void store(uint8_t *Data, int Count);
void reset_ipack(void);
void send_ipack(void);
void write_ipack(const uint8_t *Data, int Count);
void instant_repack(const uint8_t *Buf, int Count);
public:
cTS2PES(int Pid, cRingBufferLinear *ResultBuffer, int Size, uint8_t AudioCid = 0x00, uint8_t SubStreamId = 0x00, cRepacker *Repacker = NULL);
~cTS2PES();
int Pid(void) { return pid; }
void ts_to_pes(const uint8_t *Buf); // don't need count (=188)
void Clear(void);
};
uint8_t cTS2PES::headr[] = { 0x00, 0x00, 0x01 };
cTS2PES::cTS2PES(int Pid, cRingBufferLinear *ResultBuffer, int Size, uint8_t AudioCid, uint8_t SubStreamId, cRepacker *Repacker)
{
pid = Pid;
resultBuffer = ResultBuffer;
size = Size;
audioCid = AudioCid;
subStreamId = SubStreamId;
repacker = Repacker;
if (repacker)
repacker->SetSubStreamId(subStreamId);
tsErrors = 0;
ccErrors = 0;
ccCounter = -1;
if (!(buf = MALLOC(uint8_t, size)))
esyslog("Not enough memory for ts_transform");
reset_ipack();
}
cTS2PES::~cTS2PES()
{
if (tsErrors || ccErrors)
dsyslog("cTS2PES got %d TS errors, %d TS continuity errors", tsErrors, ccErrors);
free(buf);
delete repacker;
}
void cTS2PES::Clear(void)
{
reset_ipack();
}
void cTS2PES::store(uint8_t *Data, int Count)
{
int n = repacker ? repacker->Put(resultBuffer, Data, Count) : resultBuffer->Put(Data, Count);
if (n != Count)
esyslog("ERROR: result buffer overflow, dropped %d out of %d byte", Count - n, Count);
}
void cTS2PES::reset_ipack(void)
{
found = 0;
cid = 0;
plength = 0;
flag1 = 0;
flag2 = 0;
hlength = 0;
mpeg = 0;
check = 0;
which = 0;
done = false;
count = 0;
}
void cTS2PES::send_ipack(void)
{
if (count < 10)
return;
buf[3] = (AUDIO_STREAM_S <= cid && cid <= AUDIO_STREAM_E && audioCid) ? audioCid : cid;
buf[4] = (uint8_t)(((count - 6) & 0xFF00) >> 8);
buf[5] = (uint8_t)((count - 6) & 0x00FF);
store(buf, count);
switch (mpeg) {
case 2:
buf[6] = 0x80;
buf[7] = 0x00;
buf[8] = 0x00;
count = 9;
break;
case 1:
buf[6] = 0x0F;
count = 7;
break;
}
}
void cTS2PES::write_ipack(const uint8_t *Data, int Count)
{
if (count < 6) {
memcpy(buf, headr, 3);
count = 6;
}
// determine amount of data to process
int bite = Count;
if (count + bite > size)
bite = size - count;
if (repacker) {
int breakAt = repacker->BreakAt(buf, count);
// avoid memcpy of data after break location
if (0 <= breakAt && breakAt < count + bite) {
bite = breakAt - count;
if (bite < 0) // should never happen
bite = 0;
}
}
memcpy(buf + count, Data, bite);
count += bite;
if (repacker) {
// determine break location
int breakAt = repacker->BreakAt(buf, count);
if (breakAt > size) // won't fit into packet?
breakAt = -1;
if (breakAt > count) // not enough data?
breakAt = -1;
// push out data before break location
if (breakAt > 0) {
// adjust bite if above memcpy was to large
bite -= count - breakAt;
count = breakAt;
send_ipack();
// recurse for data after break location
if (Count - bite > 0)
write_ipack(Data + bite, Count - bite);
}
}
// push out data when buffer is full
if (count >= size) {
send_ipack();
// recurse for remaining data
if (Count - bite > 0)
write_ipack(Data + bite, Count - bite);
}
}
void cTS2PES::instant_repack(const uint8_t *Buf, int Count)
{
int c = 0;
while (c < Count && (mpeg == 0 || (mpeg == 1 && found < 7) || (mpeg == 2 && found < 9)) && (found < 5 || !done)) {
switch (found ) {
case 0:
case 1:
if (Buf[c] == 0x00)
found++;
else
found = 0;
c++;
break;
case 2:
if (Buf[c] == 0x01)
found++;
else if (Buf[c] != 0)
found = 0;
c++;
break;
case 3:
cid = 0;
switch (Buf[c]) {
case PROG_STREAM_MAP:
case PRIVATE_STREAM2:
case PROG_STREAM_DIR:
case ECM_STREAM :
case EMM_STREAM :
case PADDING_STREAM :
case DSM_CC_STREAM :
case ISO13522_STREAM:
done = true;
case PRIVATE_STREAM1:
case VIDEO_STREAM_S ... VIDEO_STREAM_E:
case AUDIO_STREAM_S ... AUDIO_STREAM_E:
found++;
cid = Buf[c++];
break;
default:
found = 0;
break;
}
break;
case 4:
if (Count - c > 1) {
unsigned short *pl = (unsigned short *)(Buf + c);
plength = ntohs(*pl);
c += 2;
found += 2;
}
else {
plen[0] = Buf[c];
found++;
return;
}
break;
case 5: {
plen[1] = Buf[c++];
unsigned short *pl = (unsigned short *)plen;
plength = ntohs(*pl);
found++;
}
break;
case 6:
if (!done) {
flag1 = Buf[c++];
found++;
if ((flag1 & 0xC0) == 0x80 )
mpeg = 2;
else {
hlength = 0;
which = 0;
mpeg = 1;
flag2 = 0;
}
}
break;
case 7:
if (!done && mpeg == 2) {
flag2 = Buf[c++];
found++;
}
break;
case 8:
if (!done && mpeg == 2) {
hlength = Buf[c++];
found++;
}
break;
default:
break;
}
}
if (!plength)
plength = MMAX_PLENGTH - 6;
if (done || ((mpeg == 2 && found >= 9) || (mpeg == 1 && found >= 7))) {
switch (cid) {
case AUDIO_STREAM_S ... AUDIO_STREAM_E:
case VIDEO_STREAM_S ... VIDEO_STREAM_E:
case PRIVATE_STREAM1:
if (mpeg == 2 && found == 9) {
write_ipack(&flag1, 1);
write_ipack(&flag2, 1);
write_ipack(&hlength, 1);
}
if (mpeg == 1 && found == 7)
write_ipack(&flag1, 1);
if (mpeg == 2 && (flag2 & PTS_ONLY) && found < 14) {
while (c < Count && found < 14) {
write_ipack(Buf + c, 1);
c++;
found++;
}
if (c == Count)
return;
}
while (c < Count && found < plength + 6) {
int l = Count - c;
if (l + found > plength + 6)
l = plength + 6 - found;
write_ipack(Buf + c, l);
found += l;
c += l;
}
break;
}
if (done) {
if (found + Count - c < plength + 6) {
found += Count - c;
c = Count;
}
else {
c += plength + 6 - found;
found = plength + 6;
}
}
if (plength && found == plength + 6) {
if (plength == MMAX_PLENGTH - 6)
esyslog("ERROR: PES packet length overflow in remuxer (stream corruption)");
send_ipack();
reset_ipack();
if (c < Count)
instant_repack(Buf + c, Count - c);
}
}
return;
}
void cTS2PES::ts_to_pes(const uint8_t *Buf) // don't need count (=188)
{
if (!Buf)
return;
if (Buf[1] & TS_ERROR)
tsErrors++;
if ((Buf[3] ^ ccCounter) & CONT_CNT_MASK) {
// This should check duplicates and packets which do not increase the counter.
// But as the errors usually come in bursts this should be enough to
// show you there is something wrong with signal quality.
if (ccCounter != -1 && ((Buf[3] ^ (ccCounter + 1)) & CONT_CNT_MASK)) {
ccErrors++;
// Enable this if you are having problems with signal quality.
// These are the errors I used to get with Nova-T when antenna
// was not positioned correcly (not transport errors). //tvr
//dsyslog("TS continuity error (%d)", ccCounter);
}
ccCounter = Buf[3] & CONT_CNT_MASK;
}
if (Buf[1] & PAY_START) {
if (plength == MMAX_PLENGTH - 6 && found > 6) {
plength = found - 6;
found = 0;
send_ipack();
reset_ipack();
}
}
uint8_t off = 0;
if (Buf[3] & ADAPT_FIELD) { // adaptation field?
off = Buf[4] + 1;
if (off + 4 > 187)
return;
}
instant_repack(Buf + 4 + off, TS_SIZE - 4 - off);
}
// --- cRemux ----------------------------------------------------------------
#define RESULTBUFFERSIZE KILOBYTE(256)
cRemux::cRemux(int VPid, const int *APids, const int *DPids, const int *SPids, bool ExitOnFailure)
{
exitOnFailure = ExitOnFailure;
isRadio = VPid == 0 || VPid == 1 || VPid == 0x1FFF;
numUPTerrors = 0;
synced = false;
skipped = 0;
numTracks = 0;
resultSkipped = 0;
resultBuffer = new cRingBufferLinear(RESULTBUFFERSIZE, IPACKS, false, "Result");
resultBuffer->SetTimeouts(0, 100);
if (VPid)
ts2pes[numTracks++] = new cTS2PES(VPid, resultBuffer, IPACKS);
if (APids) {
int n = 0;
while (*APids && numTracks < MAXTRACKS && n < MAXAPIDS)
ts2pes[numTracks++] = new cTS2PES(*APids++, resultBuffer, IPACKS, 0xC0 + n++);
}
if (DPids) {
int n = 0;
while (*DPids && numTracks < MAXTRACKS && n < MAXDPIDS)
ts2pes[numTracks++] = new cTS2PES(*DPids++, resultBuffer, IPACKS, 0x00, 0x80 + n++, new cDolbyRepacker);
}
/* future...
if (SPids) {
int n = 0;
while (*SPids && numTracks < MAXTRACKS && n < MAXSPIDS)
ts2pes[numTracks++] = new cTS2PES(*SPids++, resultBuffer, IPACKS, 0x00, 0x28 + n++);
}
*/
}
cRemux::~cRemux()
{
for (int t = 0; t < numTracks; t++)
delete ts2pes[t];
delete resultBuffer;
}
int cRemux::GetPid(const uchar *Data)
{
return (((uint16_t)Data[0] & PID_MASK_HI) << 8) | (Data[1] & 0xFF);
}
int cRemux::GetPacketLength(const uchar *Data, int Count, int Offset)
{
// Returns the length of the packet starting at Offset, or -1 if Count is
// too small to contain the entire packet.
int Length = (Offset + 5 < Count) ? (Data[Offset + 4] << 8) + Data[Offset + 5] + 6 : -1;
if (Length > 0 && Offset + Length <= Count)
return Length;
return -1;
}
int cRemux::ScanVideoPacket(const uchar *Data, int Count, int Offset, uchar &PictureType)
{
// Scans the video packet starting at Offset and returns its length.
// If the return value is -1 the packet was not completely in the buffer.
int Length = GetPacketLength(Data, Count, Offset);
if (Length > 0) {
if (Length >= 8) {
int i = Offset + 8; // the minimum length of the video packet header
i += Data[i] + 1; // possible additional header bytes
for (; i < Offset + Length - 5; i++) {
if (Data[i] == 0 && Data[i + 1] == 0 && Data[i + 2] == 1) {
switch (Data[i + 3]) {
case SC_PICTURE: PictureType = (Data[i + 5] >> 3) & 0x07;
return Length;
}
}
}
}
PictureType = NO_PICTURE;
return Length;
}
return -1;
}
#define TS_SYNC_BYTE 0x47
int cRemux::Put(const uchar *Data, int Count)
{
int used = 0;
// Make sure we are looking at a TS packet:
while (Count > TS_SIZE) {
if (Data[0] == TS_SYNC_BYTE && Data[TS_SIZE] == TS_SYNC_BYTE)
break;
Data++;
Count--;
used++;
}
if (used)
esyslog("ERROR: skipped %d byte to sync on TS packet", used);
// Convert incoming TS data into multiplexed PES:
for (int i = 0; i < Count; i += TS_SIZE) {
if (Count - i < TS_SIZE)
break;
if (Data[i] != TS_SYNC_BYTE)
break;
if (resultBuffer->Free() < 2 * IPACKS)
break; // A cTS2PES might write one full packet and also a small rest
int pid = GetPid(Data + i + 1);
if (Data[i + 3] & 0x10) { // got payload
for (int t = 0; t < numTracks; t++) {
if (ts2pes[t]->Pid() == pid) {
ts2pes[t]->ts_to_pes(Data + i);
break;
}
}
}
used += TS_SIZE;
}
// Check if we're getting anywhere here:
if (!synced && skipped >= 0) {
if (skipped > MAXNONUSEFULDATA) {
esyslog("ERROR: no useful data seen within %d byte of video stream", skipped);
skipped = -1;
if (exitOnFailure)
cThread::EmergencyExit(true);
}
else
skipped += used;
}
return used;
}
uchar *cRemux::Get(int &Count, uchar *PictureType)
{
// Remove any previously skipped data from the result buffer:
if (resultSkipped > 0) {
resultBuffer->Del(resultSkipped);
resultSkipped = 0;
}
#if 0
// Test recording without determining the real frame borders:
if (PictureType)
*PictureType = I_FRAME;
return resultBuffer->Get(Count);
#endif
// Special VPID case to enable recording radio channels:
if (isRadio) {
// XXX actually '0' should be enough, but '1' must be used with encrypted channels (driver bug?)
// XXX also allowing 0x1FFF to not break Michael Paar's original patch,
// XXX but it would probably be best to only use '0'
// Force syncing of radio channels to avoid "no useful data" error
synced = true;
if (PictureType)
*PictureType = I_FRAME;
return resultBuffer->Get(Count);
}
// Check for frame borders:
if (PictureType)
*PictureType = NO_PICTURE;
Count = 0;
uchar *resultData = NULL;
int resultCount = 0;
uchar *data = resultBuffer->Get(resultCount);
if (data) {
for (int i = 0; i < resultCount - 3; i++) {
if (data[i] == 0 && data[i + 1] == 0 && data[i + 2] == 1) {
int l = 0;
uchar StreamType = data[i + 3];
if (VIDEO_STREAM_S <= StreamType && StreamType <= VIDEO_STREAM_E) {
uchar pt = NO_PICTURE;
l = ScanVideoPacket(data, resultCount, i, pt);
if (l < 0)
return resultData;
if (pt != NO_PICTURE) {
if (pt < I_FRAME || B_FRAME < pt) {
esyslog("ERROR: unknown picture type '%d'", pt);
if (++numUPTerrors > MAXNUMUPTERRORS && exitOnFailure)
cThread::EmergencyExit(true);
}
else if (!synced) {
if (pt == I_FRAME) {
if (PictureType)
*PictureType = pt;
resultSkipped = i; // will drop everything before this position
SetBrokenLink(data + i, l);
synced = true;
}
}
else if (Count)
return resultData;
else if (PictureType)
*PictureType = pt;
}
}
else { //if (AUDIO_STREAM_S <= StreamType && StreamType <= AUDIO_STREAM_E || StreamType == PRIVATE_STREAM1) {
l = GetPacketLength(data, resultCount, i);
if (l < 0)
return resultData;
}
if (synced) {
if (!Count)
resultData = data + i;
Count += l;
}
else
resultSkipped = i + l;
if (l > 0)
i += l - 1; // the loop increments, too
}
}
}
return resultData;
}
void cRemux::Del(int Count)
{
resultBuffer->Del(Count);
}
void cRemux::Clear(void)
{
for (int t = 0; t < numTracks; t++)
ts2pes[t]->Clear();
resultBuffer->Clear();
}
void cRemux::SetBrokenLink(uchar *Data, int Length)
{
if (Length > 9 && Data[0] == 0 && Data[1] == 0 && Data[2] == 1 && (Data[3] & 0xF0) == VIDEO_STREAM_S) {
for (int i = Data[8] + 9; i < Length - 7; i++) { // +9 to skip video packet header
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");
}
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