Пример #1
0
static void ext_user_data()
{
  int code,ext_ID;

  startcode();

  while ((code = showbits(32))==EXT_START_CODE || code==USER_START_CODE)
  {
    if (code==EXT_START_CODE)
    {
      flushbits32();
      ext_ID = getbits(4);
      switch (ext_ID)
      {
      case SEQ_ID:
        sequence_extension();
        break;
      case DISP_ID:
        sequence_display_extension();
        break;
      case QUANT_ID:
        quant_matrix_extension();
        break;
      case SEQSCAL_ID:
        sequence_scalable_extension();
        break;
      case PANSCAN_ID:
        picture_display_extension();
        break;
      case CODING_ID:
        picture_coding_extension();
        break;
      case SPATSCAL_ID:
        picture_spatial_scalable_extension();
        break;
      case TEMPSCAL_ID:
        picture_temporal_scalable_extension();
        break;
      default:
        fprintf(stderr,"reserved extension start code ID %d\n",ext_ID);
        break;
      }
      startcode();
    }
    else
    {
      if (verbose)
        printf("user data\n");
      flushbits32();
      startcode();
    }
  }
}
Пример #2
0
Файл: gethdr.c Проект: pierz/vic
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;
}
Пример #3
0
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;
    }
  }
}