bool mpegmuxer::putpacket(int str, const void *data, int len, pts_t pts, pts_t dts, uint32_t flags)
{
stream * const s=st[str];
if (!s)
return false;
if (len == 0) {
// I'm not sure why this happens, but it does. --mr
fprintf(stderr, "mpegmuxer::putpacket called with zero length, str=%d\n", str);
return false;
}
pts+=ptsoffset;
dts+=ptsoffset;
au *newau=new au(data,len,pts,dts,flags);
if (s->type==streamtype::mpeg2video) {
uint8_t *audata=(uint8_t*) newau->getdata();
// if (0) //
for (int j=0;j+11<len;) {
uint8_t *d=audata+j;
if (d[2]&0xfe)
j+=3;
else
if (((*(u_int32_t*)&d[0])&mbo32(0xffffff00))==mbo32(0x00000100)) {
if (d[3]==0x00) // picture header
{
// vbv delay := 0xffff
d[5]|=0x07;
d[6]=0xff;
d[7]|=0xf8;
break;
} else if (d[3]==0xb3) // sequence header
{
d[8]=(VIDEOBITRATE/400) >> 10;
d[9]=((VIDEOBITRATE/400) >> 2) & 0xff;
d[10]=(((VIDEOBITRATE/400) << 6)&0xc0)|0x20|(((VBVBUFFERSIZE/2)>>5)&0x1f);
d[11]=(d[11]&0x07)|((VBVBUFFERSIZE/2)<<3);
j+=12;
} else if (d[3]==0xb5) // extension
{
if ((d[4]&0xf0) == 0x10) // sequence extension
{
// set bitrate_extension and vbv_buffer_size_extension to 0
d[6]&=0xe0;
d[7]=0x01;
d[8]=0;
j+=10;
} else
j+=5;
} else
j+=4;
} else
void mpgfile::savempg(muxer &mux, int start, int stop, int savedpics, int savepics, logoutput *log)
{
if (start<0)
start=0;
if (start>pictures)
start=pictures;
if (stop<0)
stop=0;
if (stop>pictures)
stop=pictures;
if (start==stop)
return;
if (stop<start)
{
int x=start;
start=stop;
stop=x;
}
int seekpic=idx.indexnr(start);
int framerate = mpgfile::frameratescr[idx[seekpic].getframerate()];
bool fixedstart=true;
if (mux.isempty())
{
fixedstart=false;
mux.unsetempty();
pts_t startpts = framerate / 300;
for (int i=0;i<MAXAVSTREAMS;++i)
mux.setpts(i,startpts);
}
pts_t videostartpts=idx[seekpic].getpts();
pts_t videostoppts=idx[idx.indexnr(stop)].getpts();
pts_t videooffset=videostartpts-mux.getpts(VIDEOSTREAM);
pts_t audiopts[MAXAUDIOSTREAMS];
pts_t audiostartpts[MAXAUDIOSTREAMS];
pts_t audiooffset[MAXAUDIOSTREAMS];
for(int a=0;a<MAXAUDIOSTREAMS;++a)
{
audiooffset[a]=videooffset;
audiostartpts[a]=audiopts[a]=videostartpts;
}
pts_t shift=0;
{
dvbcut_off_t start_pos = idx[idx.indexnr(start)].getpos().fileposition();
dvbcut_off_t stop_pos = idx[idx.indexnr(stop)].getpos().fileposition();
dvbcut_off_t bytes = stop_pos - start_pos;
pts_t delta_pts = (pts_t)(stop - start) * framerate / 300;
double mux_rate = (double)bytes * 9e4 / (double)delta_pts;
if (log) {
//: Placeholder will be replaced with floating point number
log->printinfo(QCoreApplication::translate("mpgfile", "Estimated mux rate: %1 MB/s").arg(mux_rate * 1e-6, 0, 'f', 2));
}
}
while (seekpic>0 && idx[seekpic].getpts()>=videostartpts-180000)
--seekpic;
dvbcut_off_t tpos;
{
int stoppic=idx.indexnr(start);
while (stoppic<pictures &&
(idx[stoppic].getpts()<videostartpts+180000 || !idx[stoppic].getseqheader()))
++stoppic;
tpos=idx[stoppic].getpos().packetposition();
}
streamhandle sh(idx[seekpic].getpos().packetposition());
streamdata *vsd=sh.newstream(VIDEOSTREAM,s[VIDEOSTREAM].type,istransportstream());
for (int a=0;a<MAXAUDIOSTREAMS;++a)
if (mux.streampresent(audiostream(a)))
sh.newstream(audiostream(a),s[audiostream(a)].type,istransportstream());
while (sh.fileposition<tpos)
if (streamreader(sh)<0)
break;
for (int a=0;a<MAXAUDIOSTREAMS;++a)
if (streamdata *sd=sh.stream[audiostream(a)])
{
pts_t tpts=videostartpts-mux.getpts(VIDEOSTREAM)+mux.getpts(audiostream(a));
sd->audio_addpts();
uint32_t startbufferpos=sd->ptsbufferpos(tpts);
if (startbufferpos>sd->getoffset())
sd->discard(startbufferpos-sd->getoffset());
sd->audio_addpts(0,true);
startbufferpos=sd->closestptsbufferpos(tpts);
if (startbufferpos>sd->getoffset())
sd->discard(startbufferpos-sd->getoffset());
pts_t apts=sd->itemlist().front().headerpts(tpts);
audiostartpts[a]=apts;
if (apts>=0)
{
if (fixedstart)
audiooffset[a]=videooffset-tpts+apts;
else if (tpts-apts>shift)
shift=tpts-apts;
}
}
if (!fixedstart)
{
videooffset-=shift;
for(int a=0;a<MAXAUDIOSTREAMS;++a)
audiooffset[a]=videooffset;
}
pts_t audiostoppts[MAXAUDIOSTREAMS];
for(int a=0;a<MAXAUDIOSTREAMS;++a)
audiostoppts[a]=videostoppts-videooffset+audiooffset[a];
int firstseqhdr=nextseqheader(start);
{
filepos_t copystart=idx[idx.indexnr(firstseqhdr)].getpos();
vsd->discard(vsd->fileposbufferpos(copystart)-vsd->getoffset());
}
bool isfirstpic=true, isfirstseq=true;
int firstseqnr=idx[idx.indexnr(firstseqhdr)].getsequencenumber();
if (firstseqhdr>start)
{
recodevideo(mux,start,firstseqhdr,videooffset,savedpics,savepics,log);
savedpics+=firstseqhdr-start;
}
int copystop=stop; // first picture not to write to stream
while (copystop<pictures && idx[idx.indexnr(copystop)].isbframe())
++copystop;
copystop=idx.indexnr(copystop);
int streampic=idx.indexnr(firstseqhdr);
while (!log || !log->cancelled())
{
int packetsread;
for (packetsread=0;packetsread<20;++packetsread)
if (streamreader(sh)<=0)
break;
if (packetsread==0)
break;
// copy video
if (vsd)
for(;;)
{
if (streampic>=copystop)
{
vsd=0;
sh.delstream(VIDEOSTREAM);
break;
}
uint32_t picsize=vsd->fileposbufferpos(idx[streampic+1].getpos())-vsd->getoffset();
if (picsize>=vsd->inbytes())
break;
if (!isfirstpic && idx[streampic].getseqheader())
isfirstseq=false;
isfirstpic=false;
int seqoff=0;
if (!isfirstseq || idx[streampic].getsequencenumber()>=firstseqnr)
{
if (isfirstseq && firstseqnr>0) // need to subtract offset from picture sequence number
{
uint8_t *d=(uint8_t*) vsd->getdata();
for (unsigned int j=0;j+5<picsize;)
{
if (d[2]&0xfe)
j+=3;
else
if (*(u_int32_t*)&d[j]==mbo32(0x00000100))
{
int seqpic=(d[j+4]<<2)|((d[j+5]>>6)&0x03);
seqpic-=firstseqnr;
d[j+4]=seqpic>>2;
d[j+5]=(d[j+5]&0x3f)|((seqpic<<6)&0xc0);
break;
}
else
++j;
}
seqoff=firstseqnr;
}
pts_t vidpts=idx[streampic].getpts()-videooffset;
pts_t viddts=vidpts;
if (!idx[streampic].isbframe())
{
viddts=mux.getdts(VIDEOSTREAM);
mux.setdts(VIDEOSTREAM,vidpts);
}
if (idx[streampic].getseqheader())
{
int tcpic=streampic;
while (tcpic < copystop && idx[tcpic].getsequencenumber() != seqoff)
++tcpic;
pts_t tcpts=idx[tcpic].getpts()-videooffset;
fixtimecode((uint8_t*)vsd->getdata(),picsize,tcpts);
}
if (!mux.putpacket(VIDEOSTREAM,vsd->getdata(),picsize,vidpts,viddts,
idx[streampic].isiframe() ? MUXER_FLAG_KEY:0 ))
{
if (log) {
//: Placeholder will be replaced with streampic number
log->printwarning(QCoreApplication::translate("mpgfile", "putpacket(streampic=%1) returned false").arg(streampic));
} else {
fprintf(stderr,"WARN: putpacket(streampic=%d) returned false\n",streampic);
}
}
}
mpegmuxer::mpegmuxer(uint32_t audiostreammask, mpgfile &mpg, const char *filename, bool dvd,
int packsize_bytes, int muxrate_bitsps) :
fd(-1), st(), muxrate(muxrate_bitsps/400), packsize(packsize_bytes), ptsoffset(0), aucounter(0),
systemhdr(0), systemhdrlen(0), pespacket_setlength(true),scr(0)
{
if (packsize<MINPACKSIZE)
packsize=0;
scrpack=int(27.e6/double(muxrate*50)*packsize+0.9999);
st[VIDEOSTREAM]=new stream(streamtype::mpeg2video,0xe0,232<<10,232<<10,true);
strpres[VIDEOSTREAM]=true;
int audiobuffersize=dvd?(4<<10):(48<<10);
for (int i=0;i<mpg.getaudiostreams();++i)
if (audiostreammask & (1u<<i)) {
streamtype::type t = mpg.getstreamtype(audiostream(i));
if (t==streamtype::ac3audio)
st[audiostream(i)]=new stream(t, 0x180+i,
audiobuffersize,58<<10,true);
/* not supported yet:
else if (t==streamtype::dtsaudio)
st[audiostream(i)]=new stream(t, 0x188+i,
audiobuffersize,58<<10,true);
*/
else
st[audiostream(i)]=new stream(t, 0xc0+i,
audiobuffersize,audiobuffersize,false);
strpres[audiostream(i)]=true;
}
systemhdrlen=dvd ? 2034 : 24; // include DVD navigation packets if dvd set
systemhdr = (void*) calloc(1, systemhdrlen);
bzero(systemhdr,systemhdrlen);
{
systemhdr_s *value = (systemhdr_s*) systemhdr;
*value = {
mbo32(0x000001bb),mbo16(18),
//1,muxrate,1,mpg.getaudiostreams(),0,0,
htom32(0x80000100 | ((muxrate&0x3fffff)<<9) | (mpg.getaudiostreams()<<2)),
//1,1,1,1,
0xe1,
//0,0x7f,
0x7f,
0xb9,mbo16(0xe000|232),0xb8,mbo16(0xc000|32),
0xbd,mbo16(0xe000|58),0xbf,mbo16(0xe000|2)
};
}
if (dvd) { // dvd nav packets
*(uint32_t*)((char*)systemhdr+24)=mbo32(0x000001bf);
*(uint16_t*)((char*)systemhdr+28)=mbo16(980);
*(uint32_t*)((char*)systemhdr+1010)=mbo32(0x000001bf);
*(uint16_t*)((char*)systemhdr+1014)=mbo16(1018);
}
// total size of all buffers: 232kB video + 4kB per mpeg audio stream
double allbuffers(double((232<<10)+mpg.getaudiostreams()*(4<<10)));
allbuffers*=1.05; // 5% assumed muxing overhead
ptsoffset=pts_t(90000.*(allbuffers/50./muxrate))+90;
if (!strncmp(filename, "pipe:", 5))
fd = atoi(filename+5);
else
fd=::open(filename,O_WRONLY|O_CREAT|O_TRUNC|O_BINARY,0666);
}
