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put_block.c：源码内容

							
#include "Includesysdefs.h"
#include "PlaycoreCaptureLogompeg_encputvlc.h"
#include "PlaycoreCaptureLogompeg_encputbits.h"
#include "PlaycoreCaptureLogompeg_encenc.h"
#ifdef SUPPORT_CAPTURE_LOGO
CONST unsigned char zig_zag_scan[64]={
  0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
  12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
  35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
  58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
};
int put_blk(short *blk,int cc)
{
  int n, dct_diff, run, signed_level;
  /* DC coefficient (7.2.1) */
  dct_diff = blk[0] - pLogoCapture->dc_dct_pred[cc]; /* difference to previous block */
  pLogoCapture->dc_dct_pred[cc] = blk[0];
  if (cc==0)
  {
	  putDClum(dct_diff);
  }
  else
  {
	  putDCchrom(dct_diff);
  }
  /* AC coefficients (7.2.2) */
  run = 0;
  for (n=1; n<64; n++)
  {
    /* use appropriate entropy scanning pattern */
    signed_level = blk[zig_zag_scan[n]];
    if (signed_level!=0)
    {
      putAC(run,signed_level);
      run = 0;
    }
    else
      run++; /* count zero coefficients */
  }
  /* End of Block -- normative block punctuation */
  putbits(2,2); /* 10 (Table B-14) */
  return 1;
}
#endif

						