int getheader ()
{
unsigned int code, gob;
/* look for startcode */
startcode ();
code = getbits (PSC_LENGTH);
gob = getbits (5);
if (gob == SE_CODE)
return 0;
if (gob == 0)
{
if (trace)
{
fprintf (trace_file, "\nPSC: ");
printbits ((code << (5 + gob)), 22, 22);
}
getpicturehdr ();
if (syntax_arith_coding) /* reset decoder after receiving */
decoder_reset (); /* fixed length PSC string */
}
else
{
if (trace)
{
fprintf (trace_file, "\nGBSC: ");
printbits ((code << (5 + gob)), 22, 22);
}
}
return gob + 1;
}
static int gethdr()
{
unsigned int code;
for (;;)
{
/* look for startcode */
startcode();
code = getbits32();
switch (code)
{
case SEQ_START_CODE:
getseqhdr();
break;
case GOP_START_CODE:
getgophdr();
break;
case PICTURE_START_CODE:
getpicturehdr();
return 1;
break;
case SEQ_END_CODE:
return 0;
break;
default:
if (!quiet)
fprintf(stderr,"Unexpected startcode %08x (ignored)\n",code);
break;
}
}
}
