transform.c

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

		fprintf(stderr,"Not a TS\n");
		return;
	} else {
		memcpy(buf,mbuf+i,TS_SIZE-i);
		if ((count = read(fdin,mbuf,i))<0)
			perror("reading");
		memcpy(buf+TS_SIZE-i,mbuf,i);
		i = 188;
	}
	count = 1;
	while (count > 0){
		if ((count = read(fdin,buf+i,IN_SIZE-i))<0)
			perror("reading");
		

		if (!pidv){
                        find_bavpids(buf+i, IN_SIZE-i, &pidv, &dummy);
                        if (pidv) fprintf(stderr, "vpid %d (0x%02x)\n",
					  pidv,pidv);
                } 

                if (!pida){
                        find_bavpids(buf+i, IN_SIZE-i, &dummy, &pida);
                        if (pida) fprintf(stderr, "apid %d (0x%02x)\n",
					  pida,pida);
                } 


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

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

	}

}


#define INN_SIZE 2*IN_SIZE
void insert_pat_pmt( int fdin, int fdout)
{
	
	uint8_t buf[INN_SIZE];
	uint8_t mbuf[TS_SIZE];
	int i;
	int count = 1;
	uint16_t pida = 0;
	uint16_t pidv = 0;
	int written,c;
	uint8_t c0 = 0;
	uint8_t c1 = 0;


	find_avpids(fdin, &pidv, &pida);
	
 	count = read(fdin,mbuf,TS_SIZE);
	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);
		memcpy(buf+TS_SIZE-i,mbuf,i);
		i = 188;
	}
	
	count = 1;
	while (count > 0){
		tspid1[24]  = pidv;
		tspid1[23] |= (pidv >> 8) & 0x3F;
		tspid1[29]  = pida;
		tspid1[28] |= (pida >> 8) & 0x3F;
		
		write(fdout,tspid0,188);
		write(fdout,tspid1,188);

		count = read(fdin,buf+i,INN_SIZE-i);
		
		written = 0;
		while (written < IN_SIZE){
			c = write(fdout,buf,INN_SIZE);
			if (c>0) written += c;
		}
		tspid0[3] |= (c0++) 
			& 0x0F ;
		tspid1[3] |= (c1++) 
			& 0x0F ;
	
		i=0;
	}

}

void get_pes (uint8_t *buf, int count, p2p *p, void (*func)(p2p *p))
{

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

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

	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 (!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:

			memcpy(p->buf, headr, 3);
			p->buf[3] = p->cid;
			memcpy(p->buf+4,p->plen,2);

			if (p->mpeg == 2 && p->found == 9){
				p->buf[6] = p->flag1;
				p->buf[7] = p->flag2;
				p->buf[8] = p->hlength;
			}

			if (p->mpeg == 1 && p->found == 7){
				p->buf[6] = p->flag1;
			}


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

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

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

				if (p->which == 1){
					p->check = buf[c];
					p->buf[p->found] = buf[c];
					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];
							p->buf[p->found] = 
								buf[c];
							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];
							p->buf[p->found] = 
								buf[c];
							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;
				memcpy(p->buf+p->found, buf+c, l);
				p->found += l;
				c += l;
			}			
			if(p->found == p->plength+6)
				func(p);
			
			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) {
			p->found = 0;
			p->done = 0;
			p->plength = 0;
			memset(p->buf, 0, MAX_PLENGTH);
			if (c < count)
				get_pes(buf+c, count-c, p, func);
		}
	}
	return;
}




void setup_pes2ts( p2p *p, uint32_t pida, uint32_t pidv, 
		   void (*ts_write)(uint8_t *buf, int count, p2p *p))
{
	init_p2p( p, ts_write, 2048);
	p->pida = pida;
	p->pidv = pidv;
	p->acounter = 0;
	p->vcounter = 0;
	p->count1 = 0;
	p->count0 = 0;
}

void kpes_to_ts( p2p *p,uint8_t *buf ,int count )
{
	get_pes(buf,count, p,pes_in_ts);
}


void setup_ts2pes( p2p *pa, p2p *pv, uint32_t pida, uint32_t pidv, 
		   void (*pes_write)(uint8_t *buf, int count, p2p *p))
{
	init_p2p( pa, pes_write, 2048);
	init_p2p( pv, pes_write, 2048);
	pa->pid = pida;
	pv->pid = pidv;
}

void kts_to_pes( p2p *p, uint8_t *buf) // don't need count (=188)
{
	uint8_t off = 0;
	uint16_t pid = 0;

	if (!(buf[3]&PAYLOAD)) // no payload?
		return;

	pid = get_pid(buf+1);
			
	if (pid != p->pid) return;

	if ( buf[1]&PAY_START) {
		if (p->plength == MMAX_PLENGTH-6){
			p->plength = p->found-6;
			p->found = 0;
			pes_repack(p);
		}
	}

	if ( buf[3] & ADAPT_FIELD) {  // adaptation field?
		off = buf[4] + 1;
		if (off+4 > 187) return;
	}
        
	get_pes(buf+4+off, TS_SIZE-4-off, p , pes_repack);
}




// instant repack


void reset_ipack(ipack *p)
{
	p->found = 0;
	p->cid = 0;
	p->plength = 0;
	p->flag1 = 0;
	p->flag2 = 0;
	p->hlength = 0;
	p->mpeg = 0;
	p->check = 0;
	p->which = 0;
	p->done = 0;
	p->count = 0;
	p->size = p->size_orig;
}

void init_ipack(ipack *p, int size,
		void (*func)(uint8_t *buf,  int size, void *priv), int ps)
{
	if ( !(p->buf = malloc(size)) ){
		fprintf(stderr,"Couldn't allocate memory for ipack\n");
		exit(1);
	}
	p->ps = ps;
	p->size_orig = size;
	p->func = func;
	reset_ipack(p);
	p->has_ai = 0;
	p->has_vi = 0;
	p->start = 0;
}

void free_ipack(ipack * p)
{
	if (p->buf) free(p->buf);
}



int get_vinfo(uint8_t *mbuf, int count, VideoInfo *vi, int pr)
{
	uint8_t *headr;
	int found = 0;
        int sw;
	int form = -1;
	int c = 0;

	while (found < 4 && c+4 < count){
		uint8_t *b;

		b = mbuf+c;
		if ( b[0] == 0x00 && b[1] == 0x00 && b[2] == 0x01
		     && b[3] == 0xb3) found = 4;
		else {
			c++;
		}
	}

	if (! found) return -1;
	c += 4;
	if (c+12 >= count) return -1;
	headr = mbuf+c;

	vi->horizontal_size	= ((headr[1] &0xF0) >> 4) | (headr[0] << 4);
	vi->vertical_size	= ((headr[1] &0x0F) << 8) | (headr[2]);
    
        sw = (int)((headr[3]&0xF0) >> 4) ;

        switch( sw ){
	case 1:
		if (pr)
			fprintf(stderr,"Videostream: ASPECT: 1:1");
		vi->aspect_ratio = 100;        
		break;
	case 2:
		if (pr)
			fprintf(stderr,"Videostream: ASPECT: 4:3");
                vi->aspect_ratio = 133;        
		break;
	case 3:
		if (pr)
			fprintf(stderr,"Videostream: ASPECT: 16:9");
                vi->aspect_ratio = 177;        
		break;
	case 4:
		if (pr)
			fprintf(stderr,"Videostream: ASPECT: 2.21:1");
                vi->aspect_ratio = 221;        
		break;

        case 5 ... 15:
		if (pr)
			fprintf(stderr,"Videostream: ASPECT: reserved");
                vi->aspect_ratio = 0;        
		break;

        default:
                vi->aspect_ratio = 0;        
                return -1;
	}

	if (pr)
		fprintf(stderr,"  Size = %dx%d",vi->horizontal_size,
			vi->vertical_size);

        sw = (int)(headr[3]&0x0F);

        switch ( sw ) {
	case 1:
		if (pr)
			fprintf(stderr,"  FRate: 23.976 fps");
                vi->framerate = 24000/1001.;
		form = -1;
		break;
	case 2:
		if (pr)
			fprintf(stderr,"  FRate: 24 fps");
                vi->framerate = 24;
		form = -1;
		break;
	case 3:
		if (pr)
			fprintf(stderr,"  FRate: 25 fps");
                vi->framerate = 25;
		form = VIDEO_MODE_PAL;
		break;
	case 4:
		if (pr)
			fprintf(stderr,"  FRate: 29.97 fps");
                vi->framerate = 30000/1001.;
		form = VIDEO_MODE_NTSC;
		break;
	case 5:
		if (pr)
			fprintf(stderr,"  FRate: 30 fps");
                vi->framerate = 30;
		form = VIDEO_MODE_NTSC;
		break;
	case 6:
		if (pr)
			fprintf(stderr,"  FRate: 50 fps");
                vi->framerate = 50;
		form = VIDEO_MODE_PAL;
		break;
	case 7:
		if (pr)
			fprintf(stderr,"  FRate: 60 fps");
                vi->framerate = 60;
		form = VIDEO_MODE_NTSC;
		break;
	}

	vi->bit_rate = 400*(((headr[4] << 10) & 0x0003FC00UL) 
			    | ((headr[5] << 2) & 0x000003FCUL) | 
			    (((headr[6] & 0xC0) >> 6) & 0x00000003UL));
	
	if (pr){
		fprintf(stderr,"  BRate: %.2f Mbit/s",(vi->bit_rate)/1000000.);
		fprintf(stderr,"\n");
	}
        vi->video_format = form;

	vi->off = c-4;
	return c-4;
}

extern unsigned int bitrates[3][16];
extern uint32_t freq[4];

int get_ainfo(uint8_t *mbuf, int count, AudioInfo *ai, int pr)
{
	uint8_t *headr;
	int found = 0;
	int c = 0;
	int fr =0;
	
	while (!found && c < count){
		uint8_t *b = mbuf+c;

		if ( b[0] == 0xff && (b[1] & 0xf8) == 0xf8)
			found = 1;
		else {
			c++;
		}
	}	

	if (!found) return -1;

	if (c+3 >= count) return -1;
        headr = mbuf+c;

	ai->layer = (headr[1] & 0x06) >> 1;

        if (pr)
		fprintf(stderr,"Audiostream: Layer: %d", 4-ai->layer);


	ai->bit_rate = bitrates[(3-ai->layer)][(headr[2] >> 4 )]*1000;

	if (pr){
		if (ai->bit_rate == 0)
			fprintf (stderr,"  Bit rate: free");
		else if (ai->bit_rate == 0xf)
			fprintf (stderr,"  BRate: reserved");
		else
			fprintf (stderr,"  BRate: %d kb/s", ai->bit_rate/1000);
	}

	fr = (headr[2] & 0x0c ) >> 2;
	ai->frequency = freq[fr]*100;
	
	if (pr){
		if (ai->frequency == 3)
			fprintf (stderr, "  Freq: reserved\n");
		else
			fprintf (stderr,"  Freq: %2.1f kHz\n", 
				 ai->frequency/1000.);
	}
	ai->off = c;
	return c;
}

unsigned int ac3_bitrates[32] =
    {32,40,48,56,64,80,96,112,128,160,192,224,256,320,384,448,512,576,640,
     0,0,0,0,0,0,0,0,0,0,0,0,0};

uint32_t ac3_freq[4] = {480, 441, 320, 0};
uint32_t ac3_frames[3][32] =
    {{64,80,96,112,128,160,192,224,256,320,384,448,512,640,768,896,1024,
      1152,1280,0,0,0,0,0,0,0,0,0,0,0,0,0},
     {69,87,104,121,139,174,208,243,278,348,417,487,557,696,835,975,1114,
      1253,1393,0,0,0,0,0,0,0,0,0,0,0,0,0},
     {96,120,144,168,192,240,288,336,384,480,576,672,768,960,1152,1344,
      1536,1728,1920,0,0,0,0,0,0,0,0,0,0,0,0,0}}; 

int get_ac3info(uint8_t *mbuf, int count, AudioInfo *ai, int pr)
{
	uint8_t *headr;
	int found = 0;
	int c = 0;
	uint8_t frame;
	int fr = 0;

	while ( !found  && c < count){
		uint8_t *b = mbuf+c;
		if ( b[0] == 0x0b &&  b[1] == 0x77 )
			found = 1;
		else {
			c++;
		}
	}	


	if (!found){
		return -1;
	}
	ai->off = c;

	if (c+5 >= count) return -1;

	ai->layer = 0;  // 0 for AC3