text_bits.c
上传用户:tuheem
上传日期:2007-05-01
资源大小:21889k
文件大小:15k
- #include "momusys.h"
- #include "text_defs.h"
- #include "bitstream.h"
- #include "text_bits.h"
- #include "putvlc.h"
- #include "zigzag.h"
- #include "max_level.h"
- Int IntraDC_dpcm (Int val, Int lum, Image *bitstream);
- Int CodeCoeff (Int j_start, Int Mode, Int qcoeff[],
- Int block, Int ncoeffs, Image *bitstream);
- Int CodeCoeff_RVLC (Int j_start, Int Mode, Int qcoeff[],
- Int block, Int ncoeffs, Image *bitstream);
- Void MB_CodeCoeff(Bits* bits, Int *qcoeff,
- Int Mode, Int CBP, Int ncoeffs,
- Int intra_dcpred_disable,
- Image *DCbitstream,
- Image *bitstream,
- Int transp_pattern[], Int direction[],
- Int error_res_disable,
- Int reverse_vlc,
- Int switched,
- Int alternate_scan)
- {
- Int i, m, coeff[64];
- Int *zz = alternate_scan ? zigzag_v : zigzag;
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- if (intra_dcpred_disable == 0)
- {
- for (i = 0; i < 6; i++)
- {
- {
- if (!alternate_scan)
- {
- switch (direction[i])
- {
- case 1: zz = zigzag_v; break;
- case 2: zz = zigzag_h; break;
- case 0: break;
- default: fprintf(stderr, "MB_CodeCoeff(): Error in zigzag directionn");
- exit(-1);
- }
- }
-
- for (m = 0; m < 64; m++)
- {
- *(coeff + zz[m]) = qcoeff[i*ncoeffs+m];
- }
- if (switched==0)
- {
- if (error_res_disable)
- {
- if (i < 4)
- bits->Y += IntraDC_dpcm(coeff[0],1,bitstream);
- else
- bits->C += IntraDC_dpcm(coeff[0],0,bitstream);
- }
- else
- {
- if (i < 4)
- bits->Y += IntraDC_dpcm(coeff[0],1,DCbitstream);
- else
- bits->C += IntraDC_dpcm(coeff[0],0,DCbitstream);
- }
- }
-
- if ((i==0 && CBP&32) ||
- (i==1 && CBP&16) ||
- (i==2 && CBP&8) ||
- (i==3 && CBP&4) ||
- (i==4 && CBP&2) ||
- (i==5 && CBP&1))
- {
- if (error_res_disable || ((!error_res_disable) && (!reverse_vlc)))
- {
- if (i < 4)
- bits->Y += CodeCoeff(1-switched,Mode, coeff,i,ncoeffs,bitstream);
- else
- bits->C += CodeCoeff(1-switched,Mode, coeff,i,ncoeffs,
- bitstream);
- }
- else
- {
- if (i < 4)
- bits->Y += CodeCoeff_RVLC(1-switched,Mode, coeff, i,
- ncoeffs, bitstream);
- else
- bits->C += CodeCoeff_RVLC(1-switched,Mode, coeff, i,
- ncoeffs, bitstream);
- }
- }
- }
- }
- }
- else
- {
- for (i = 0; i < 6; i++)
- {
- {
-
- for (m = 0; m < 64; m++)
- *(coeff + zz[m]) = qcoeff[i*ncoeffs+m];
- if (switched==0)
- {
- if (error_res_disable)
- {
- if (coeff[0] != 128)
- BitstreamPutBits(bitstream,(long)(coeff[0]),8L);
- else
- BitstreamPutBits(bitstream, 255L, 8L);
- }
- else
- {
- if (coeff[0] != 128)
- BitstreamPutBits(DCbitstream,(long)(coeff[0]),8L);
- else
- BitstreamPutBits(DCbitstream,255L, 8L);
- }
- if (i < 4)
- bits->Y += 8;
- else
- bits->C += 8;
- }
- if ((i==0 && CBP&32) || (i==1 && CBP&16) ||
- (i==2 && CBP&8) || (i==3 && CBP&4) ||
- (i==4 && CBP&2) || (i==5 && CBP&1))
- {
-
- if (error_res_disable || ((!error_res_disable) && (!reverse_vlc)))
- {
- if (i < 4)
- bits->Y += CodeCoeff(1-switched,Mode, coeff,i,ncoeffs,
- bitstream);
- else
- bits->C += CodeCoeff(1-switched,Mode, coeff,i,ncoeffs,
- bitstream);
- }
- else
- {
- if (i < 4)
- bits->Y += CodeCoeff_RVLC(1-switched,Mode, coeff, i,
- ncoeffs, bitstream);
- else
- bits->C += CodeCoeff_RVLC(1-switched,Mode, coeff, i,
- ncoeffs, bitstream);
- }
- }
- }
- }
- }
- }
- else
- {
- for (i = 0; i < 6; i++)
- {
-
- for (m = 0; m < 64; m++)
- *(coeff + zz[m]) = qcoeff[i*ncoeffs+m];
- if ((i==0 && CBP&32) ||
- (i==1 && CBP&16) ||
- (i==2 && CBP&8) ||
- (i==3 && CBP&4) ||
- (i==4 && CBP&2) ||
- (i==5 && CBP&1))
- {
- if (error_res_disable || ((!error_res_disable) && (!reverse_vlc)))
- {
- if (i < 4)
- bits->Y += CodeCoeff(0,Mode, coeff, i, ncoeffs, bitstream);
- else
- bits->C += CodeCoeff(0,Mode, coeff, i, ncoeffs, bitstream);
- }
- else
- {
- if (i < 4)
- bits->Y += CodeCoeff_RVLC(0,Mode, coeff, i, ncoeffs,
- bitstream);
- else
- bits->C += CodeCoeff_RVLC(0,Mode, coeff, i, ncoeffs,
- bitstream);
- }
- }
- }
- }
- }
- Int
- IntraDC_dpcm(Int val, Int lum, Image *bitstream)
- {
- Int n_bits;
- Int absval, size = 0;
- absval = ( val <0)?-val:val;
-
- size = 0;
- while(absval)
- {
- absval>>=1;
- size++;
- }
- if (lum)
- {
- n_bits = PutDCsize_lum (size, bitstream);
- }
- else
- {
- n_bits = PutDCsize_chrom (size, bitstream);
- }
- if ( size != 0 )
- {
- if (val>=0)
- {
- ;
- }
- else
- {
- absval = -val;
- val = (absval ^( (int)pow(2.0,(double)size)-1) );
- }
- BitstreamPutBits(bitstream, (long)(val), (long)(size));
- n_bits += size;
- if (size > 8)
- BitstreamPutBits(bitstream, (long)1, (long)1);
- }
- return n_bits;
- }
- Int CodeCoeff(Int j_start, Int Mode, Int qcoeff[], Int block, Int ncoeffs, Image *bitstream)
- {
- Int j, bits;
- Int prev_run, run, prev_level, level, first;
- Int prev_ind, ind, prev_s, s, length;
- run = bits = 0;
- first = 1;
- prev_run = prev_level = prev_ind = level = s = prev_s = ind = 0;
- for (j = j_start; j< ncoeffs; j++)
- {
-
- {
-
-
- s = 0;
-
- if ((level = qcoeff[j]) == 0)
- {
- run++;
- }
- else
- {
-
- if (level < 0)
- {
- s = 1;
- level = -level;
- }
- ind = level | run<<4;
- ind = ind | 0<<12;
- if (!first)
- {
-
- if ((prev_run < 64) &&
- (((prev_level < 13) && (Mode != MODE_INTRA &&
- Mode != MODE_INTRA_Q))
- || ((prev_level < 28) && (Mode == MODE_INTRA ||
- Mode == MODE_INTRA_Q))))
- {
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutCoeff_Intra(prev_run, prev_level,
- 0, bitstream);
- }
- else
- {
- length = PutCoeff_Inter(prev_run, prev_level,
- 0, bitstream);
- }
- }
- else
- length = 0;
-
- if (length == 0)
- {
- if ( prev_run < 64 )
- {
-
- int level_minus_max;
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- level_minus_max = prev_level -
- intra_max_level[0][prev_run];
- else
- level_minus_max = prev_level -
- inter_max_level[0][prev_run];
- if ( ( (level_minus_max < 13) && (Mode != MODE_INTRA && Mode != MODE_INTRA_Q) ) ||
- ( (level_minus_max < 28) && (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) ) )
- {
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutLevelCoeff_Intra(prev_run, level_minus_max, 0, bitstream);
- }
- else
- {
- length = PutLevelCoeff_Inter(prev_run, level_minus_max, 0, bitstream);
- }
- } else
- length = 0;
- }
- else length = 0;
- }
-
- if (length == 0)
- {
- if ( ((prev_level < 13) && (Mode != MODE_INTRA && Mode != MODE_INTRA_Q)) ||
- ((prev_level < 28) && (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)) )
- {
-
- int run_minus_max;
- if (prev_level == 0)
- {
- fprintf (stdout, "ERROR(CodeCoeff-second esc): level is %dn", prev_level);
- exit(-1);
- }
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- run_minus_max = prev_run - (intra_max_run0[prev_level]+1);
- else
- run_minus_max = prev_run - (inter_max_run0[prev_level]+1);
-
- if (run_minus_max < 64)
- {
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutRunCoeff_Intra(run_minus_max, prev_level, 0, bitstream);
- }
- else
- {
- length = PutRunCoeff_Inter(run_minus_max, prev_level, 0, bitstream);
- }
- } else
- length = 0;
- }
- else length = 0;
- }
-
- if (length == 0)
- {
- if (prev_s == 1)
- {
-
-
- prev_level = (prev_level^0xfff)+1;
- }
- BitstreamPutBits(bitstream, 3L, 7L);
-
- BitstreamPutBits(bitstream, 3L, 2L);
-
- BitstreamPutBits(bitstream, 0L, 1L);
-
- BitstreamPutBits(bitstream, (long)(prev_run), 6L);
-
- BitstreamPutBits(bitstream, MARKER_BIT, 1);
-
-
-
-
- BitstreamPutBits(bitstream, (long)(prev_level), 12L);
-
- BitstreamPutBits(bitstream, MARKER_BIT, 1);
-
- bits += 30;
- }
- else
- {
- BitstreamPutBits(bitstream, (long)(prev_s), 1L);
- bits += length + 1;
- }
- }
- prev_run = run; prev_s = s;
- prev_level = level; prev_ind = ind;
- run = first = 0;
- }
- }
- }
-
- if (!first)
- {
- prev_ind = prev_ind | 1<<12;
- if ((prev_run < 64) &&
- (((prev_level < 4) && (Mode != MODE_INTRA &&
- Mode != MODE_INTRA_Q))
- || ((prev_level < 9) && ((Mode == MODE_INTRA) ||
- (Mode == MODE_INTRA_Q)))))
- {
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutCoeff_Intra(prev_run, prev_level, 1,
- bitstream);
- }
- else
- {
- length = PutCoeff_Inter(prev_run, prev_level, 1,
- bitstream);
- }
- }
- else
- length = 0;
-
- if (length == 0)
- {
- if ( prev_run < 64 )
- {
-
- int level_minus_max;
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- level_minus_max = prev_level - intra_max_level[1][prev_run];
- else
- level_minus_max = prev_level - inter_max_level[1][prev_run];
- if ( ( (level_minus_max < 4) && (Mode != MODE_INTRA && Mode != MODE_INTRA_Q) ) ||
- ( (level_minus_max < 9) && (Mode == MODE_INTRA || Mode == MODE_INTRA_Q) ) )
- {
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutLevelCoeff_Intra(prev_run, level_minus_max, 1, bitstream);
- }
- else
- {
- length = PutLevelCoeff_Inter(prev_run, level_minus_max, 1, bitstream);
- }
- } else
- length = 0;
- }
- else length = 0;
- }
-
- if (length == 0)
- {
- if (((prev_level < 4) && (Mode != MODE_INTRA && Mode != MODE_INTRA_Q))||
- ((prev_level < 9) && (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)) )
- {
-
- int run_minus_max;
- if (prev_level == 0)
- {
- fprintf (stdout, "ERROR(CodeCoeff-second esc): level is %dn", prev_level);
- exit(-1);
- }
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- run_minus_max = prev_run - (intra_max_run1[prev_level]+1);
- else
- run_minus_max = prev_run - (inter_max_run1[prev_level]+1);
- if (run_minus_max < 64)
- {
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutRunCoeff_Intra(run_minus_max, prev_level, 1, bitstream);
- }
- else
- {
- length = PutRunCoeff_Inter(run_minus_max, prev_level, 1, bitstream);
- }
- } else
- length = 0;
- }
- else length = 0;
- }
-
- if (length == 0)
- {
- if (prev_s == 1)
- {
-
-
- prev_level = (prev_level^0xfff)+1;
- }
- BitstreamPutBits(bitstream, 3L, 7L);
- BitstreamPutBits(bitstream, 3L, 2L);
- BitstreamPutBits(bitstream, 1L, 1L);
- BitstreamPutBits(bitstream, (long)(prev_run), 6L);
-
- BitstreamPutBits(bitstream, MARKER_BIT, 1);
-
-
-
-
- BitstreamPutBits(bitstream, (long)(prev_level), 12L);
-
- BitstreamPutBits(bitstream, MARKER_BIT, 1);
-
- bits += 30;
- }
- else
- {
- BitstreamPutBits(bitstream, (long)(prev_s), 1L);
- bits += length + 1;
- }
- }
- return bits;
- }
- Int CodeCoeff_RVLC(Int j_start, Int Mode, Int qcoeff[], Int block, Int ncoeffs, Image *bitstream)
- {
- Int j, bits;
- Int prev_run, run, prev_level, level, first;
- Int prev_ind, ind, prev_s, s, length;
- run = bits = 0;
- first = 1;
- prev_run = prev_level = prev_ind = level = s = prev_s = ind = 0;
- for (j = j_start; j< ncoeffs; j++)
- {
-
- {
-
-
- s = 0;
-
- if ((level = qcoeff[j]) == 0)
- {
- run++;
- }
- else
- {
-
- if (level < 0)
- {
- s = 1;
- level = -level;
- }
- ind = level | run<<4;
- ind = ind | 0<<12;
- if (!first)
- {
-
- if (prev_level < 28 && prev_run < 39)
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutCoeff_Intra_RVLC(prev_run, prev_level, 0,
- bitstream);
- }
- else
- {
- length = PutCoeff_Inter_RVLC(prev_run, prev_level, 0,
- bitstream);
- }
- else
- length = 0;
- if (length == 0)
- {
-
- BitstreamPutBits(bitstream, 1L, 5L);
-
- BitstreamPutBits(bitstream, 0L, 1L);
- BitstreamPutBits(bitstream,
- (long)(prev_run), 6L);
-
-
-
-
- BitstreamPutBits( bitstream, MARKER_BIT, 1 );
-
- BitstreamPutBits( bitstream, (long)(prev_level), 11L);
- BitstreamPutBits( bitstream, MARKER_BIT, 1 );
-
- BitstreamPutBits(bitstream, 0L, 4L);
-
- BitstreamPutBits(bitstream,
- (long)(prev_s),1L);
- bits += 5 + 1 + 6 + 1 + 11 + 1 + 4 + 1;
-
- }
- else
- {
- BitstreamPutBits(bitstream,
- (long)(prev_s), 1L);
- bits += length + 1;
- }
- }
- prev_run = run; prev_s = s;
- prev_level = level; prev_ind = ind;
- run = first = 0;
- }
- }
- }
-
- if (!first)
- {
- prev_ind = prev_ind | 1<<12;
- if (prev_level < 5 && prev_run < 45)
-
- if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
- {
- length = PutCoeff_Intra_RVLC(prev_run, prev_level, 1,
- bitstream);
- }
- else
- {
- length = PutCoeff_Inter_RVLC(prev_run, prev_level, 1,
- bitstream);
- }
- else
- length = 0;
- if (length == 0)
- {
- BitstreamPutBits(bitstream, 1L, 5L);
- BitstreamPutBits(bitstream, 1L, 1L);
-
- BitstreamPutBits(bitstream, (long)(prev_run), 6L);
-
-
-
- BitstreamPutBits( bitstream, MARKER_BIT, 1 );
-
- BitstreamPutBits( bitstream, (long)(prev_level), 11L);
- BitstreamPutBits( bitstream, MARKER_BIT, 1 );
- BitstreamPutBits(bitstream, 0L, 4L);
-
- BitstreamPutBits(bitstream, (long)(prev_s), 1L);
- bits += 24;
- }
- else
- {
- BitstreamPutBits(bitstream, (long)(prev_s), 1L);
- bits += length + 1;
- }
- }
- return bits;
- }
- void
- Bits_Reset (Bits *bits)
- {
- memset(bits, 0, sizeof(Bits));
- }