countbit.c

H。263标准的编解码程序代码

    if (x_vec < 0) x_vec += 64;
    if (y_vec < 0) y_vec += 64;

    if (trace) {
      fprintf(tf,"Vectors:\n");
    }
    bits->vec += Encode(x_vec,vlc_mv);
    bits->vec += Encode(y_vec,vlc_mv);

    if (trace) {
      if (x_vec > 31) x_vec -= 64;
      if (y_vec > 31) y_vec -= 64;
      fprintf(tf,"(x,y) = (%d,%d) - ",
	      (2*(*MV_xy).x + (*MV_xy).x_half),
	      (2*(*MV_xy).y + (*MV_xy).y_half));
      fprintf(tf,"(Px,Py) = (%d,%d)\n", pmv0,pmv1);
      fprintf(tf,"(x_diff,y_diff) = (%d,%d)\n",x_vec,y_vec);
    }
  }

  return;
}

void FindPMV(MotionVector *MV_ptr, int x, int y, 
	     int *pmv0, int *pmv1, int block, int newgob, int half_pel)
{
  int p1,p2,p3;
  int xin1,xin2,xin3;
  int yin1,yin2,yin3;
  int vec1,vec2,vec3;
  int l8,o8,or8;

  l8 = o8 = or8 = 0;
 
  vec1 = (l8 ? 2 : 0) ; yin1 = y  ; xin1 = x-1;
  vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x;
  vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;

  if (half_pel) {

    p1 = (x > 0) ? 
      2*((*(MV_ptr + yin1*mbc + xin1)).x) + (*(MV_ptr+ yin1*mbc + xin1)).x_half : 0;
    p2 = (y > 0) ? 
      2*((*(MV_ptr + yin2*mbc + xin2)).x) + (*(MV_ptr + yin2*mbc + xin2)).x_half : 2*NO_VEC;
    if((y > 0) && (x < mbc - 1))
      p3 = 2*((*(MV_ptr+yin3*mbc + xin3)).x) + ((*(MV_ptr + yin3*mbc + xin3)).x_half);
    else if(x == mbc - 1)
      p3 = 0;
    else			/* y == 0 && x != mbc - 1 */
      p3 = 2*NO_VEC;
    }
  else {
    p1 =  (x > 0) ? 
      (2*((*(MV_ptr + yin1*mbc + xin1)).x)) : 0;
    p2 =  (y > 0) ? 
      (2*((*(MV_ptr + yin2*mbc + xin2)).x)) : 2*NO_VEC;
    if((y > 0) && (x < mbc - 1))
      p3 = 2*((*(MV_ptr + yin3*mbc + xin3)).x);
    else if(x == mbc - 1)
      p3 = 0;
    else			/* y == 0 && x != mbc - 1 */
      p3 = 2*NO_VEC;
  }

  if (newgob && (block == 0 || block == 1 || block == 2))
    p2 = 2*NO_VEC;

  if (p2 == 2*NO_VEC) { p2 = p3 = p1; }

  *pmv0 = p1+p2+p3 - mmax(p1,mmax(p2,p3)) - mmin(p1,mmin(p2,p3));
  if (half_pel) {
    p1 =  (x > 0) ? 
      (2*((*(MV_ptr + yin1*mbc + xin1)).y)) + ((*(MV_ptr + yin1*mbc + xin1)).y_half) : 0;
    p2 =  (y > 0) ? 
      2*((*(MV_ptr + yin2*mbc + xin2)).y) + ((*(MV_ptr + yin2*mbc + xin2)).y_half) : 2*NO_VEC;

    if((y > 0) && (x < mbc - 1))
      p3 = 2*((*(MV_ptr + yin3*mbc + xin3)).y) + ((*(MV_ptr + mbc*yin3 + xin3)).y_half);
    else if(x == mbc - 1)
      p3 = 0;
    else			/* y == 0 && x != mbc - 1 */
      p3 = 2*NO_VEC;
 
  }
  else {
    p1 = (x > 0) ?
      (2*((*(MV_ptr + yin1*mbc + xin1)).y)) : 0;
    p2 =  (y > 0) ?
      (2*((*(MV_ptr + yin2*mbc + xin2)).y)) : 2*NO_VEC;
    if((y > 0) && (x < mbc - 1))
      p3 = 2*((*(MV_ptr + yin3*mbc + xin3)).y);
    else if(x == mbc - 1)
      p3 = 0;
    else			/* y == 0 && x != mbc - 1 */
      p3 = 2*NO_VEC;
  }    

 
  if (newgob && (block == 0 || block == 1 || block == 2))
    p2 = 2*NO_VEC;

  if (p2 == 2*NO_VEC) { p2 = p3 = p1; }

  *pmv1 = p1+p2+p3 - mmax(p1,mmax(p2,p3)) - mmin(p1,mmin(p2,p3));
  
  return;
}

void ZeroBits(Bits *bits)
{
#ifndef MINIMAL_REPORT
  bits->Y = 0;
  bits->C = 0;
  bits->vec = 0;
  bits->CBPY = 0;
  bits->CBPCM = 0;
  bits->MODB = 0;
  bits->CBPB = 0;
  bits->COD = 0;
  bits->DQUANT = 0;
  bits->header = 0;
  bits->total = 0;
  bits->no_inter = 0;
  bits->no_inter4v = 0;
  bits->no_intra = 0;
#endif
  return;
}

void ZeroRes(Results *res)
{
#ifndef MINIMAL_REPORT
  res->SNR_l = 0;
  res->SNR_Cr = 0;
  res->SNR_Cb = 0;
  res->QP_mean = 0;
#endif
}

void AddBits(Bits *total, Bits *bits)
{
#ifndef MINIMAL_REPORT
  total->Y += bits->Y;
  total->C += bits->C;
  total->vec += bits->vec;
  total->CBPY += bits->CBPY;
  total->CBPCM += bits->CBPCM;
  total->MODB += bits->MODB;
  total->CBPB += bits->CBPB;
  total->COD += bits->COD;
  total->DQUANT += bits->DQUANT;
  total->header += bits->header;
  total->total += bits->total;
  total->no_inter += bits->no_inter;
  total->no_inter4v += bits->no_inter4v;
  total->no_intra += bits->no_intra;
#endif
  return;
}
void AddRes(Results *total, Results *res, Pict *pic)
{
#ifndef MINIMAL_REPORT
  total->SNR_l += res->SNR_l;
  total->SNR_Cr += res->SNR_Cr;
  total->SNR_Cb += res->SNR_Cb;
  total->QP_mean += pic->QP_mean;
#endif
  return;
}

void AddBitsPicture(Bits *bits)
{
#ifndef MINIMAL_REPORT
  bits->total = 
    bits->Y + 
    bits->C + 
    bits->vec +  
    bits->CBPY + 
    bits->CBPCM + 
    bits->MODB +
    bits->CBPB +
    bits->COD + 
    bits->DQUANT +
    bits->header ;
#endif
} 
void ZeroVec(MotionVector *MV)
{
  MV->x = 0;
  MV->y = 0;
  MV->x_half = 0;
  MV->y_half = 0;
  return;
}
void MarkVec(MotionVector *MV)
{
  MV->x = NO_VEC;
  MV->y = NO_VEC;
  MV->x_half = 0;
  MV->y_half = 0;
  return;
}

void CopyVec(MotionVector *MV2, MotionVector *MV1)
{
  MV2->x = MV1->x;
  MV2->x_half = MV1->x_half;
  MV2->y = MV1->y;
  MV2->y_half = MV1->y_half;
  return;
}

int EqualVec(MotionVector *MV2, MotionVector *MV1)
{
  if (MV1->x != MV2->x)
    return 0;
  if (MV1->y != MV2->y)
    return 0;
  if (MV1->x_half != MV2->x_half)
    return 0;
  if (MV1->y_half != MV2->y_half)
    return 0;
  return 1;
}

/**********************************************************************
 *
 *	Name:		CountBitsPicture(Pict *pic)
 *	Description:    counts the number of bits needed for picture
 *                      header
 *	
 *	Input:	        pointer to picture structure
 *	Returns:        number of bits
 *	Side effects:
 *
 *	Date: 941128	Author:[e-mail]
 *
 ***********************************************************************/

int CountBitsPicture(Pict *pic)
{
  int bits = 0;

 
  /* Picture start code */
  if (trace) {
    fprintf(tf,"picture_start_code: ");
  }
  mputv(PSC_LENGTH,PSC);
  bits += PSC_LENGTH;

  /* Group number */
  if (trace) {
    fprintf(tf,"Group number in picture header: ");
  }
  mputv(5,0); 
  bits += 5;
  
  /* Time reference */
  if (trace) {
    fprintf(tf,"Time reference: ");
  }
  mputv(8,pic->TR);
  bits += 8;

 /* bit 1 */
  if (trace) {
    fprintf(tf,"spare: ");
  }
  pic->spare = 1; /* always 1 to avoid start code emulation */
  mputv(1,pic->spare);
  bits += 1;

  /* bit 2 */
  if (trace) {
    fprintf(tf,"always zero for distinction with H.261\n");
  }
  mputv(1,0);
  bits += 1;
  
  /* bit 3 */
  if (trace) {
    fprintf(tf,"split_screen_indicator: ");
  }
  mputv(1,0);     /* no support for split-screen in this software */
  bits += 1;

  /* bit 4 */
  if (trace) {
    fprintf(tf,"document_camera_indicator: ");
  }
  mputv(1,0);
  bits += 1;

  /* bit 5 */
  if (trace) {
    fprintf(tf,"freeze_picture_release: ");
  }
  mputv(1,0);
  bits += 1;

  /* bit 6-8 */
  if (trace) {
    fprintf(tf,"source_format: ");
  }
  mputv(3,pic->source_format);
  bits += 3;

  /* bit 9 */
  if (trace) {
    fprintf(tf,"picture_coding_type: ");
  }
  mputv(1,pic->picture_coding_type);
  bits += 1;

  /* bit 10 */
  if (trace) {
    fprintf(tf,"mv_outside_frame: ");
  }
  mputv(1,pic->unrestricted_mv_mode);  /* Unrestricted Motion Vector mode */
  bits += 1;

  /* bit 11 */
  if (trace) {
    fprintf(tf,"sac_coding: ");
  }
  mputv(1,0); /* Syntax-based Arithmetic Coding mode not used*/
  bits += 1;

  /* bit 12 */
  if (trace) {
    fprintf(tf,"adv_pred_mode: ");
  }
  mputv(1,advanced); /* Advanced Prediction mode */
  bits += 1;

  /* bit 13 */
  if (trace) {
    fprintf(tf,"PB-coded: "); /* PB-frames mode */
  }
  mputv(1,pic->PB);
  bits += 1;


  /* QUANT */
  if (trace) {
    fprintf(tf,"QUANT: ");
  }
  mputv(5,pic->QUANT);
  bits += 5;

  /* Continuous Presence Multipoint (CPM) */
  mputv(1,0); /* CPM is not supported in this software */
  bits += 1;

  /* Picture Sub Bitstream Indicator (PSBI) */
  /* if CPM == 1: 2 bits PSBI */
  /* not supported */


  /* PEI (extra information) */
  if (trace) {
    fprintf(tf,"PEI: ");
  }
  /* "Encoders shall not insert PSPARE until specified by the ITU" */
  mputv(1,0); 
  bits += 1;

  /* PSPARE */
  /* if PEI == 1: 8 bits PSPARE + another PEI bit */
  /* not supported */

  return bits;
}