transform.c

DVBstream is based on the ts-rtp package available at http://www.linuxtv.org. It broadcasts a (subs

        headr = mbuf+c+2;

	frame = (headr[2]&0x3f);
	ai->bit_rate = ac3_bitrates[frame>>1]*1000;

	if (pr) fprintf (stderr,"  BRate: %d kb/s", ai->bit_rate/1000);

	fr = (headr[2] & 0xc0 ) >> 6;
	ai->frequency = freq[fr]*100;
	if (pr) fprintf (stderr,"  Freq: %d Hz\n", ai->frequency);

	ai->framesize = ac3_frames[fr][frame >> 1];
	if ((frame & 1) &&  (fr == 1)) ai->framesize++;
	ai->framesize = ai->framesize << 1;
	if (pr) fprintf (stderr,"  Framesize %d\n", ai->framesize);

	return c;
}


void ps_pes(ipack *p)
{
	int check;
	uint8_t pbuf[PS_HEADER_L2];
	static int muxr = 0;
	static int ai = 0;
	static int vi = 0;
	static int start = 0;
	static uint32_t SCR = 0;

	if (p->mpeg == 2){
		switch(p->buf[3]){
		case VIDEO_STREAM_S ... VIDEO_STREAM_E:
			if (!p->has_vi){
				if(get_vinfo(p->buf, p->count, &p->vi,1) >=0) {
					p->has_vi = 1;
					vi = p->vi.bit_rate;
				}
			} 			
			break;

		case AUDIO_STREAM_S ... AUDIO_STREAM_E:
			if (!p->has_ai){
				if(get_ainfo(p->buf, p->count, &p->ai,1) >=0) {
					p->has_ai = 1;
					ai = p->ai.bit_rate;
				}
			} 
			break;
		}

		if (p->has_vi && vi && !muxr){
			muxr = (vi+ai)/400;
		}

		if ( start && muxr && (p->buf[7] & PTS_ONLY) && (p->has_ai || 
				       p->buf[9+p->buf[8]+4] == 0xb3)){  
			SCR = trans_pts_dts(p->pts)-3600;
			
			check = write_ps_header(pbuf,
						SCR,
						muxr, 1, 0, 0, 1, 1, 1, 
						0, 0, 0, 0, 0, 0);

			p->func(pbuf, check , p->data);
		}

		if (muxr && !start && vi){
			SCR = trans_pts_dts(p->pts)-3600;
			check = write_ps_header(pbuf,
						SCR, 
						muxr, 1, 0, 0, 1, 1, 1, 
						0xC0, 0, 64, 0xE0, 1, 460);
			start = 1;
			p->func(pbuf, check , p->data);
		}

		if (start)
			p->func(p->buf, p->count, p->data);
	}
}

void send_ipack(ipack *p)
{
	int streamid=0;
	int off;
	int ac3_off = 0;
	AudioInfo ai;
	int nframes= 0;
	int f=0;

	if (p->count < 10) return;
	p->buf[3] = p->cid;
	p->buf[4] = (uint8_t)(((p->count-6) & 0xFF00) >> 8);
	p->buf[5] = (uint8_t)((p->count-6) & 0x00FF);

	
	if (p->cid == PRIVATE_STREAM1){

		off = 9+p->buf[8];
		streamid = p->buf[off];
		if ((streamid & 0xF8) == 0x80){
			ai.off = 0;
			ac3_off = ((p->buf[off+2] << 8)| p->buf[off+3]);
			if (ac3_off < p->count)
				f=get_ac3info(p->buf+off+3+ac3_off, 
					      p->count-ac3_off, &ai,0);
			if ( !f ){
				nframes = (p->count-off-3-ac3_off)/ 
					ai.framesize + 1;
				p->buf[off+2] = (ac3_off >> 8)& 0xFF;
				p->buf[off+3] = (ac3_off)& 0xFF;
				p->buf[off+1] = nframes;
				
				ac3_off +=  nframes * ai.framesize - p->count;
			}
		}
	} 
	
	if (p->ps) ps_pes(p);
	else p->func(p->buf, p->count, p->data);

	switch ( p->mpeg ){
	case 2:		
		
		p->buf[6] = 0x80;
		p->buf[7] = 0x00;
		p->buf[8] = 0x00;
		p->count = 9;

		if (p->cid == PRIVATE_STREAM1 && (streamid & 0xF8)==0x80 ){
			p->count += 4;
			p->buf[9] = streamid;
			p->buf[10] = (ac3_off >> 8)& 0xFF;
			p->buf[11] = (ac3_off)& 0xFF;
			p->buf[12] = 0;
		}
		
		break;
	case 1:
		p->buf[6] = 0x0F;
		p->count = 7;
		break;
	}

}


static void write_ipack(ipack *p, uint8_t *data, int count)
{

	uint8_t headr[3] = { 0x00, 0x00, 0x01} ;
	int diff =0;

	if (p->count < 6){
		if (trans_pts_dts(p->pts) > trans_pts_dts(p->last_pts))
			memcpy(p->last_pts, p->pts, 5);
		p->count = 0;
		memcpy(p->buf+p->count, headr, 3);
		p->count += 6;
	}
	if ( p->size == p->size_orig && p->plength &&
	     (diff = 6+p->plength - p->found + p->count +count) > p->size &&
	     diff < 3*p->size/2){
		
			p->size = diff/2;
//			fprintf(stderr,"size: %d \n",p->size);
	}
	if (p->count + count < p->size){
		memcpy(p->buf+p->count, data, count); 
		p->count += count;
	} else {
		int rest = p->size - p->count;
		if (rest < 0) rest = 0;
		memcpy(p->buf+p->count, data, rest);
		p->count += rest;
//		fprintf(stderr,"count: %d \n",p->count);
		send_ipack(p);
		if (count - rest > 0)
			write_ipack(p, data+rest, count-rest);
	}
}

void instant_repack (uint8_t *buf, int count, ipack *p)
{

	int l;
	unsigned short *pl;
	int c=0;

	while (c < count && (p->mpeg == 0 ||
			     (p->mpeg == 1 && p->found < 7) ||
			     (p->mpeg == 2 && p->found < 9))
	       &&  (p->found < 5 || !p->done)){
		switch ( p->found ){
		case 0:
		case 1:
			if (buf[c] == 0x00) p->found++;
			else p->found = 0;
			c++;
			break;
		case 2:
			if (buf[c] == 0x01) p->found++;
			else if (buf[c] == 0){
				p->found = 2;
			} else p->found = 0;
			c++;
			break;
		case 3:
			p->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:
				p->done = 1;
			case PRIVATE_STREAM1:
			case VIDEO_STREAM_S ... VIDEO_STREAM_E:
			case AUDIO_STREAM_S ... AUDIO_STREAM_E:
				p->found++;
				p->cid = buf[c];
				c++;
				break;
			default:
				p->found = 0;
				break;
			}
			break;
			

		case 4:
			if (count-c > 1){
				pl = (unsigned short *) (buf+c);
				p->plength =  ntohs(*pl);
				p->plen[0] = buf[c];
				c++;
				p->plen[1] = buf[c];
				c++;
				p->found+=2;
			} else {
				p->plen[0] = buf[c];
				p->found++;
				return;
			}
			break;
		case 5:
			p->plen[1] = buf[c];
			c++;
			pl = (unsigned short *) p->plen;
			p->plength = ntohs(*pl);
			p->found++;
			break;


		case 6:
			if (!p->done){
				p->flag1 = buf[c];
				c++;
				p->found++;
				if ( (p->flag1 & 0xC0) == 0x80 ) p->mpeg = 2;
				else {
					p->hlength = 0;
					p->which = 0;
					p->mpeg = 1;
					p->flag2 = 0;
				}
			}
			break;

		case 7:
			if ( !p->done && p->mpeg == 2){
				p->flag2 = buf[c];
				c++;
				p->found++;
			}	
			break;

		case 8:
			if ( !p->done && p->mpeg == 2){
				p->hlength = buf[c];
				c++;
				p->found++;
			}
			break;
			
		default:

			break;
		}
	}


	if (c == count) return;

	if (!p->plength) p->plength = MMAX_PLENGTH-6;


	if ( p->done || ((p->mpeg == 2 && p->found >= 9)  || 
	     (p->mpeg == 1 && p->found >= 7)) ){
		switch (p->cid){
			
		case AUDIO_STREAM_S ... AUDIO_STREAM_E:			
		case VIDEO_STREAM_S ... VIDEO_STREAM_E:
		case PRIVATE_STREAM1:
			
			if (p->mpeg == 2 && p->found == 9){
				write_ipack(p, &p->flag1, 1);
				write_ipack(p, &p->flag2, 1);
				write_ipack(p, &p->hlength, 1);
			}

			if (p->mpeg == 1 && p->found == 7){
				write_ipack(p, &p->flag1, 1);
			}


			if (p->mpeg == 2 && (p->flag2 & PTS_ONLY) &&  
			    p->found < 14){
				while (c < count && p->found < 14){
					p->pts[p->found-9] = buf[c];
					write_ipack(p, buf+c, 1);
					c++;
					p->found++;
				}
				if (c == count) return;
			}

			if (p->mpeg == 1 && p->which < 2000){

				if (p->found == 7) {
					p->check = p->flag1;
					p->hlength = 1;
				}

				while (!p->which && c < count && 
				       p->check == 0xFF){
					p->check = buf[c];
					write_ipack(p, buf+c, 1);
					c++;
					p->found++;
					p->hlength++;
				}

				if ( c == count) return;
				
				if ( (p->check & 0xC0) == 0x40 && !p->which){
					p->check = buf[c];
					write_ipack(p, buf+c, 1);
					c++;
					p->found++;
					p->hlength++;

					p->which = 1;
					if ( c == count) return;
					p->check = buf[c];
					write_ipack(p, buf+c, 1);
					c++;
					p->found++;
					p->hlength++;
					p->which = 2;
					if ( c == count) return;
				}

				if (p->which == 1){
					p->check = buf[c];
					write_ipack(p, buf+c, 1);
					c++;
					p->found++;
					p->hlength++;
					p->which = 2;
					if ( c == count) return;
				}
				
				if ( (p->check & 0x30) && p->check != 0xFF){
					p->flag2 = (p->check & 0xF0) << 2;
					p->pts[0] = p->check;
					p->which = 3;
				} 

				if ( c == count) return;
				if (p->which > 2){
					if ((p->flag2 & PTS_DTS_FLAGS)
					    == PTS_ONLY){
						while (c < count && 
						       p->which < 7){
							p->pts[p->which-2] =
								buf[c];
							write_ipack(p,buf+c,1);
							c++;
							p->found++;
							p->which++;
							p->hlength++;
						}
						if ( c == count) return;
					} else if ((p->flag2 & PTS_DTS_FLAGS) 
						   == PTS_DTS){
						while (c < count && 
						       p->which< 12){
							if (p->which< 7)
								p->pts[p->which
								      -2] =
									buf[c];
							write_ipack(p,buf+c,1);
							c++;
							p->found++;
							p->which++;
							p->hlength++;
						}
						if ( c == count) return;
					}
					p->which = 2000;
				}
							
			}

			while (c < count && p->found < p->plength+6){
				l = count -c;
				if (l+p->found > p->plength+6)
					l = p->plength+6-p->found;
				write_ipack(p, buf+c, l);
				p->found += l;
				c += l;
			}	
		
			break;
		}


		if ( p->done ){
			if( p->found + count - c < p->plength+6){
				p->found += count-c;
				c = count;
			} else {
				c += p->plength+6 - p->found;
				p->found = p->plength+6;
			}
		}

		if (p->plength && p->found == p->plength+6) {
			send_ipack(p);
			reset_ipack(p);
			if (c < count)
				instant_repack(buf+c, count-c, p);
		}
	}
	return;
}

void write_out_es(uint8_t *buf, int count,void  *priv)
{
	ipack *p = (ipack *) priv;
	u8 payl = buf[8]+9+p->start-1;

	write(p->fd, buf+payl, count-payl);
	p->start = 1;
}

void write_out_pes(uint8_t *buf, int count,void  *priv)
{
	ipack *p = (ipack *) priv;
	write(p->fd, buf, count);
}



int64_t ts_demux(int fdin, int fdv_out,int fda_out,uint16_t pida,
		  uint16_t pidv, int es)
{
	uint8_t buf[IN_SIZE];
	uint8_t mbuf[TS_SIZE];
	int i;
	int count = 1;
	uint16_t pid;
	ipack pa, pv;
	ipack *p;
	u8 *sb;
	int64_t apts=0;
	int64_t vpts=0;
	int verb = 0;
	uint64_t length =0;
	uint64_t l=0;
	int perc =0;
	int last_perc =0;

	if (fdin != STDIN_FILENO) verb = 1; 

	if (verb) {
		length = lseek(fdin, 0, SEEK_END);
		lseek(fdin,0,SEEK_SET);
	}

	if (!pida || !pidv)
		find_avpids(fdin, &pidv, &pida);

	if (es){
		init_ipack(&pa, IPACKS,write_out_es, 0);
		init_ipack(&pv, IPACKS,write_out_es, 0);
	} else {
		init_ipack(&pa, IPACKS,write_out_pes, 0);
		init_ipack(&pv, IPACKS,write_out_pes, 0);
	} 
	pa.fd = fda_out;
	pv.fd = fdv_out;
	pa.data = (void *)&pa;
	pv.data = (void *)&pv;

 	count = read(fdin,mbuf,TS_SIZE);
	if (count) l+=count;
	for ( i = 0; i < 188 ; i++){
		if ( mbuf[i] == 0x47 ) break;
	}
	if ( i == 188){
		fprintf(stderr,"Not a TS\n");
		return 0;
	} else {
		memcpy(buf,mbuf+i,TS_SIZE-i);
		count = read(fdin,mbuf,i);
		if (count) l+=count;
		memcpy(buf+TS_SIZE-i,mbuf,i);
		i = 188;
	}
	
	count = 1;
	while (count > 0){
		count = read(fdin,buf+i,IN_SIZE-i);
		if (count) l+=count;
		if (verb && perc >last_perc){
			perc = (100*l)/length;
			fprintf(stderr,"Reading TS  %d %%\r",perc);
			last_perc = perc;
		}
		
		for( i = 0; i < count; i+= TS_SIZE){
			uint8_t off = 0;

			if ( count - i < TS_SIZE) break;

			pid = get_pid(buf+i+1);
			if (!(buf[3+i]&0x10)) // no payload?
				continue;
			if (pid == pidv){
				p = &pv;
			} else {
				if (pid == pida){
					p = &pa;
				} else continue;
			}

			if ( buf[3+i] & 0x20) {  // adaptation field?
				off = buf[4+i] + 1;
			}

			if ( buf[1+i]&0x40) {
				if (p->plength == MMAX_PLENGTH-6){
					p->plength = p->found-6;
					p->found = 0;
					send_ipack(p);
					reset_ipack(p);
				}
				sb = buf+4+off+i;
				if( es && 
				    !p->start && (sb[7] & PTS_DTS_FLAGS)){
					uint8_t *pay = sb+sb[8]+9; 
					int l = TS_SIZE - 13 - off - sb[8];
					if ( pid == pidv &&   
					     (p->start = 
					      get_vinfo( pay, l,&p->vi,1)+1) >0
						){
						vpts = trans_pts_dts(sb+9);
						printf("vpts : %fs\n",
						       vpts/90000.);
					}
					if ( pid == pida && 
					     (p->start = 
					      get_ainfo( pay, l,&p->ai,1)+1) >0
						){
						apts = trans_pts_dts(sb+9);
						printf("apts : %fs\n",
						       apts/90000.);
					}
				}
			}

			if (p->start)
				instant_repack(buf+4+off+i, TS_SIZE-4-off, p);
		}
		i = 0;

	}

	return (vpts-apts);
}

void ts2es(int fdin,  uint16_t pidv)
{
	uint8_t buf[IN_SIZE];
	uint8_t mbuf[TS_SIZE];
	int i;
	int count = 1;
	ipack p;
	int verb = 0;
	uint64_t length =0;
	uint64_t l=0;
	int perc =0;
	int last_perc =0;
	uint16_t pid;

	if (fdin != STDIN_FILENO) verb = 1; 

	if (verb) {
		length = lseek(fdin, 0, SEEK_END);
		lseek(fdin,0,SEEK_SET);
	}

	init_ipack(&p, IPACKS,write_out_es, 0);

	p.fd = STDOUT_FILENO;
	p.data = (void *)&p;

 	count = read(fdin,mbuf,TS_SIZE);
	if (count) l+=count;
	for ( i = 0; i < 188 ; i++){
		if ( mbuf[i] == 0x47 ) break;
	}
	if ( i == 188){
		fprintf(stderr,"Not a TS\n");
		return;
	} else {
		memcpy(buf,mbuf+i,TS_SIZE-i);
		count = read(fdin,mbuf,i);
		if (count) l+=count;
		memcpy(buf+TS_SIZE-i,mbuf,i);
		i = 188;
	}
	
	count = 1;
	while (count > 0){
		count = read(fdin,buf+i,IN_SIZE-i);
		if (count) l+=count;
		if (verb && perc >last_perc){
			perc = (100*l)/length;
			fprintf(stderr,"Reading TS  %d %%\r",perc);
			last_perc = perc;
		}

		for( i = 0; i < count; i+= TS_SIZE){
			uint8_t off = 0;

			if ( count - i < TS_SIZE) break;

			pid = get_pid(buf+i+1);
			if (!(buf[3+i]&0x10)) // no payload?
				continue;
			if (pid != pidv){
				continue;
			}

			if ( buf[3+i] & 0x20) {  // adaptation field?
				off = buf[4+i] + 1;
			}

			if ( buf[1+i]&0x40) {
				if (p.plength == MMAX_PLENGTH-6){
					p.plength = p.found-6;
					p.found = 0;
					send_ipack(&p);
					reset_ipack(&p);
				}
			}

			instant_repack(buf+4+off+i, TS_SIZE-4-off, &p);
		}
		i = 0;

	}
}


void change_aspect(int fdin, int fdout, int aspect)
{
	ps_packet ps;
	pes_packet pes;
	int neof,i;

	do {
		init_ps(&ps);
		neof = read_ps(fdin,&ps);
		write_ps(fdout,&ps);
		for (i = 0; i < ps.npes; i++){
			u8 *buf;
			int c = 0;
			int l;

			init_pes(&pes);
			read_pes(fdin, &pes);

			buf = pes.pes_pckt_data;

			switch (pes.stream_id){
			case VIDEO_STREAM_S ... VIDEO_STREAM_E:
				l=pes.length;
				break;
			default:
				l = 0;
				break;
			}
			while ( c < l - 6){
				if (buf[c] == 0x00 && 
				    buf[c+1] == 0x00 &&
				    buf[c+2] == 0x01 && 
				    buf[c+3] == 0xB3) {
					c += 4;
					buf[c+3] &= 0x0f;
					buf[c+3] |= aspect;
				}
				else c++;
			}
			write_pes(fdout,&pes);
		}
	} while( neof > 0 );
}