pes_misc.c

DVB MPEG2 system stream 分析, 包含 各個talbe(EIT,PMT,PAT,SDT),以及video,audio. 對於學習數字電視有很大幫助.

/*
$Id: pes_misc.c,v 1.7 2004/02/20 22:18:41 rasc Exp $


 DVBSNOOP

 a dvb sniffer  and mpeg2 stream analyzer tool
 http://dvbsnoop.sourceforge.net/

 (c) 2001-2004   [e-mail]  (rasc)



 -- PES misc.



$Log: pes_misc.c,v $
Revision 1.7  2004/02/20 22:18:41  rasc
DII complete (hopefully)
BIOP::ModuleInfo  (damned, who is spreading infos over several standards???)
maybe someone give me a hint on the selector_byte info!!!
some minor changes...

Revision 1.6  2004/02/05 10:30:57  rasc
no message

Revision 1.5  2004/02/04 23:54:37  rasc
Bugfix:  PTS wrongly displayed!!!

Revision 1.4  2004/02/02 23:34:08  rasc
- output indent changed to avoid \r  (which sucks on logged output)
- EBU PES data started (teletext, vps, wss, ...)
- bugfix: PES synch. data stream
- some other stuff

Revision 1.3  2004/01/25 21:37:28  rasc
bugfixes, minor changes & enhancments

Revision 1.2  2004/01/22 22:26:35  rasc
pes_pack_header
section read timeout

Revision 1.1  2004/01/11 21:01:32  rasc
PES stream directory, PES restructured




*/




#include "dvbsnoop.h"
#include "pes_misc.h"
#include "misc/hexprint.h"
#include "misc/helper.h"
#include "misc/output.h"




/*
 *  PTS //  DTS
 *  Len is 36 bits fixed
 */

void  print_xTS_field (int v, const char *str, u_char *b, int bit_offset) 
{
  long long   xTS_32_30;
  long long   xTS_29_15;
  long long   xTS_14_0;
  long long   ull;
  int         bo = bit_offset;
  int         v1 = v+1;


  out_nl (v,"%s:",str);
  indent (+1);

    xTS_32_30 = outBit_Sx_NL (v1,"bit[32..30]: ",	b, bo+0,  3);
                outBit_Sx_NL (v1,"marker_bit: ",	b, bo+3,  1);
    xTS_29_15 = outBit_Sx_NL (v1,"bit[29..15]: ",	b, bo+4, 15);
                outBit_Sx_NL (v1,"marker_bit: ",	b, bo+19, 1);
    xTS_14_0  = outBit_Sx_NL (v1,"bit[14..0]: ",	b, bo+20,15);
                outBit_Sx_NL (v1,"marker_bit: ",	b, bo+35, 1);

    ull = (xTS_32_30<<30) + (xTS_29_15<<15) + xTS_14_0;
    out (v," ==> %s: %llu (0x%08llx)", str, ull,ull);

    // -- display time
    {
	int     h,m,s,u;
	u_long  p = ull/90;

	// -- following lines taken from "dvbtextsubs  Dave Chapman"
	h=(p/(1000*60*60));
	m=(p/(1000*60))-(h*60);
	s=(p/1000)-(h*3600)-(m*60);
	u=p-(h*1000*60*60)-(m*1000*60)-(s*1000);

	out_nl (v,"  [= 90 kHz-Timestamp: %d:%02d:%02d.%03d]", h,m,s,u);
    }

  indent (-1);
}





/*
 *  PES/PS  Pack Header
 *  if (len == -1) then pack_header is in a PS
 *  else  pack_header is in a pes packet
 *        and check if a system_header is within len
 */


void pack_header (int v, u_char *b, int len)
{

	/* z.B. H.222 ISO 13818-1 Table 2-33 */
	/* 	ISO 11172-1 pack header */


   int 	v1 = v+1;
   int  pack_stuffing_len;


   if (len == 0) return;

   out_nl (v,"Pack_header: ");
   indent (+1);

   outBit_Sx_NL (v1,"pack_start_code: ",	b,  0, 32);
   outBit_Sx_NL (v1,"fixed '01': ",		b, 32,  2);
   print_xTS_field (v1, "system_clock_reference_base", 	b, 34) ;   // len 36b
   outBit_Sx_NL (v1,"system_clock_reference_extension: ",b, 70,  9);
   outBit_Sx_NL (v1,"marker_bit: ",		b, 79, 1);

   outBit_Sx   (v1,"program_mux_rate: ",	b, 80,22);
   	out_nl (v1,"  [=  x 50 bytes/sec]");

   outBit_Sx_NL (v1,"marker_bit: ",		b, 102, 1);
   outBit_Sx_NL (v1,"marker_bit: ",		b, 103, 1);
   outBit_Sx_NL (v1,"reserved: ",		b, 104, 5);

   pack_stuffing_len = outBit_Sx_NL (v1,"pack_stuffing_len: ",	b, 109, 3);
   print_databytes (6,"stuffing bytes 0xFF:", b+14, pack_stuffing_len);

   b += 14 + pack_stuffing_len;
   if (len >= 0) len -= 14 + pack_stuffing_len;

   if (len > 0) system_header (v1, b, len);

   indent (-1);
}




/*
 *  PS System header
 */


void system_header (int v, u_char *b, int len)
{

	/*  ... $$$ TODO   */
	/* z.B. H.222 ISO 13818-1 Table 2-34 */
	/* 	ISO 11172-1 system header */

   if (len <= 0) return;

   out_nl (v,"System_header: ");
   indent (+1);


   // $$$ TODO  PS system header
   printhex_buf (v, b, len);



   indent (-1);
}


// $$$ TODO  Program Streams   (START/END