?? getvlc.cc
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#include "all.hh"#include "getvlc.hh"/* private prototypes */inline int getIMBtype(void);inline int getPMBtype(void);inline int getBMBtype(void);inline int getDMBtype(void);inline int getspIMBtype(void);inline int getspPMBtype(void);inline int getspBMBtype(void);inline int getSNRMBtype(void);int getMBtype(){ if (ld->scalable_mode==SC_SNR) return getSNRMBtype(); else{ switch (pict_type){ case I_TYPE: return ld->pict_scal ? getspIMBtype() : getIMBtype(); case P_TYPE: return ld->pict_scal ? getspPMBtype() : getPMBtype(); case B_TYPE: return ld->pict_scal ? getspBMBtype() : getBMBtype(); case D_TYPE: return getDMBtype(); default: if (!quiet) { msg("getMBtype: unknown coding type");dec2hex(pict_type);} /* MPEG-1 only, not implemented */ } } return 0;}inline int getIMBtype(){#ifdef TRACE if (trace) printf("mb_type(I) ");#endif if (vs->getbits(1)){#ifdef TRACE if (trace) printf("(1): Intra (1)\n");#endif return 1; } if (!vs->getbits(1)){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getIMBtype)\n"); fault = 1; }#ifdef TRACE if (trace) printf("(01): Intra, Quant (17)\n");#endif return 17;}#ifdef TRACEstatic char *MBdescr[]={ "", "Intra", "No MC, Coded", "", "Bwd, Not Coded", "", "Bwd, Coded", "", "Fwd, Not Coded", "", "Fwd, Coded", "", "Interp, Not Coded", "", "Interp, Coded", "", "", "Intra, Quant", "No MC, Coded, Quant", "", "", "", "Bwd, Coded, Quant", "", "", "", "Fwd, Coded, Quant", "", "", "", "Interp, Coded, Quant", ""};#endifinline int getPMBtype(){ int code;#ifdef TRACE if (trace) printf("mb_type(P) (");#endif if ((code = vs->showbits(6))>=8){ code >>= 3; vs->flushbits(PMBtab0[code].len);#ifdef TRACE if (trace){ printbits(code,3,PMBtab0[code].len); printf("): %s (%d)\n",MBdescr[PMBtab0[code].val],PMBtab0[code].val); }#endif return PMBtab0[code].val; } if (code==0){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getPMBtype)\n"); fault = 1; return 0; } vs->flushbits(PMBtab1[code].len);#ifdef TRACE if (trace){ printbits(code,6,PMBtab1[code].len); printf("): %s (%d)\n",MBdescr[PMBtab1[code].val],PMBtab1[code].val); }#endif return PMBtab1[code].val;}inline int getBMBtype(){ int code;#ifdef TRACE if (trace) printf("mb_type(B) (");#endif if ((code = vs->showbits(6))>=8){ code >>= 2; vs->flushbits(BMBtab0[code].len);#ifdef TRACE if (trace){ printbits(code,4,BMBtab0[code].len); printf("): %s (%d)\n",MBdescr[BMBtab0[code].val],BMBtab0[code].val); }#endif return BMBtab0[code].val; } if (code==0){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getBMBtype)\n"); fault = 1; return 0; } vs->flushbits(BMBtab1[code].len);#ifdef TRACE if (trace){ printbits(code,6,BMBtab1[code].len); printf("): %s (%d)\n",MBdescr[BMBtab1[code].val],BMBtab1[code].val); }#endif return BMBtab1[code].val;}inline int getDMBtype(){ if (!vs->getbits(1)){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getDMBtype)\n"); fault=1; } return 1;}/* macroblock_type for pictures with spatial scalability */inline int getspIMBtype(){ int code;#ifdef TRACE if (trace) printf("mb_type(I,spat) (");#endif code = vs->showbits(4); if (code==0){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getspIMBtype)\n"); fault = 1; return 0; }#ifdef TRACE if (trace){ printbits(code,4,spIMBtab[code].len); printf("): %02x\n",spIMBtab[code].val); }#endif vs->flushbits(spIMBtab[code].len); return spIMBtab[code].val;}inline int getspPMBtype(){#ifdef TRACE if (trace) printf("mb_type(P,spat) (");#endif int code = vs->showbits(7); if (code<2){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getspPMBtype)\n"); fault = 1; return 0; } if (code>=16){ code >>= 3; vs->flushbits(spPMBtab0[code].len);#ifdef TRACE if (trace){ printbits(code,4,spPMBtab0[code].len); printf("): %02x\n",spPMBtab0[code].val); }#endif return spPMBtab0[code].val; } vs->flushbits(spPMBtab1[code].len);#ifdef TRACE if (trace){ printbits(code,7,spPMBtab1[code].len); printf("): %02x\n",spPMBtab1[code].val); }#endif return spPMBtab1[code].val;}inline int getspBMBtype(){ VLCtab *p;#ifdef TRACE if (trace) printf("mb_type(B,spat) (");#endif int code = vs->showbits(9); if (code>=64) p = &spBMBtab0[(code>>5)-2]; else if (code>=16) p = &spBMBtab1[(code>>2)-4]; else if (code>=8) p = &spBMBtab2[code-8]; else { if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getspBMBtype)\n"); fault = 1; return 0; } vs->flushbits(p->len);#ifdef TRACE if (trace){ printbits(code,9,p->len); printf("): %02x\n",p->val); }#endif return p->val;}inline int getSNRMBtype(){ int code = vs->showbits(3); if (code==0){ if (!quiet) fprintf(stderr,"Invalid macroblock_type code (getSNSRMBtype)\n"); fault = 1; return 0; } vs->flushbits(SNRMBtab[code].len); return SNRMBtab[code].val;}int getMV(){ int code;#ifdef TRACE if (trace) printf("motion_code (");#endif if (vs->getbits(1)){#ifdef TRACE if (trace) printf("0): 0\n");#endif return 0; } if ((code = vs->showbits(9))>=64){ code >>= 6; vs->flushbits(MVtab0[code].len);#ifdef TRACE if (trace){ printbits(code,3,MVtab0[code].len); printf("%d): %d\n", vs->showbits(1),vs->showbits(1)?-MVtab0[code].val:MVtab0[code].val); }#endif return vs->getbits(1)?-MVtab0[code].val:MVtab0[code].val; } if (code>=24){ code >>= 3; vs->flushbits(MVtab1[code].len);#ifdef TRACE if (trace){ printbits(code,6,MVtab1[code].len); printf("%d): %d\n", vs->showbits(1),vs->showbits(1)?-MVtab1[code].val:MVtab1[code].val); }#endif return vs->getbits(1)?-MVtab1[code].val:MVtab1[code].val; } if ((code-=12)<0){ if (!quiet) fprintf(stderr,"Invalid motion_vector code\n"); fault=1; return 0; } vs->flushbits(MVtab2[code].len);#ifdef TRACE if (trace){ printbits(code+12,9,MVtab2[code].len); printf("%d): %d\n", vs->showbits(1),vs->showbits(1)?-MVtab2[code].val:MVtab2[code].val); }#endif return vs->getbits(1) ? -MVtab2[code].val : MVtab2[code].val;}/* get differential motion vector (for dual prime prediction) */int getDMV(){#ifdef TRACE if (trace) printf("dmvector (");#endif if (vs->getbits(1)){#ifdef TRACE if (trace) printf(vs->showbits(1) ? "11): -1\n" : "10): 1\n");#endif return vs->getbits(1) ? -1 : 1; } else {#ifdef TRACE if (trace) printf("0): 0\n");#endif return 0; }}int getCBP(){ int code;#ifdef TRACE if (trace) printf("coded_block_pattern_420 (");#endif if ((code = vs->showbits(9))>=128){ code >>= 4; vs->flushbits(CBPtab0[code].len);#ifdef TRACE if (trace){ printbits(code,5,CBPtab0[code].len); printf("): "); printbits(CBPtab0[code].val,6,6); printf(" (%d)\n",CBPtab0[code].val); }#endif return CBPtab0[code].val; } if (code>=8){ code >>= 1; vs->flushbits(CBPtab1[code].len);#ifdef TRACE if (trace){ printbits(code,8,CBPtab1[code].len); printf("): "); printbits(CBPtab1[code].val,6,6); printf(" (%d)\n",CBPtab1[code].val); }#endif return CBPtab1[code].val; } if (code<1){ if (!quiet) fprintf(stderr,"Invalid coded_block_pattern code\n"); fault = 1; return 0; } vs->flushbits(CBPtab2[code].len);#ifdef TRACE if (trace){ printbits(code,9,CBPtab2[code].len); printf("): "); printbits(CBPtab2[code].val,6,6); printf(" (%d)\n",CBPtab2[code].val); }#endif return CBPtab2[code].val;}int getMBA(){ int code, val;#ifdef TRACE if (trace) printf("macroblock_address_increment (");#endif val=0; while ((code = vs->showbits(11))<24){ if (code!=15){ /* if not macroblock_stuffing */ if (code==8){ /* if macroblock_escape */#ifdef TRACE if (trace) printf("00000001000 ");#endif val+= 33; } else { if (!quiet) fprintf(stderr,"Invalid macroblock_address_increment code\n"); fault = 1; return 1; } }#ifdef TRACE else if (trace) printf("00000001111 ");#endif vs->flushbits(11); } if (code>=1024){ vs->flushbits(1);#ifdef TRACE if (trace) printf("1): %d\n",val+1);#endif return val + 1; } if (code>=128){ code >>= 6; vs->flushbits(MBAtab1[code].len);#ifdef TRACE if (trace){ printbits(code,5,MBAtab1[code].len); printf("): %d\n",val+MBAtab1[code].val); }#endif return val + MBAtab1[code].val; } code-= 24; vs->flushbits(MBAtab2[code].len);#ifdef TRACE if (trace){ printbits(code+24,11,MBAtab2[code].len); printf("): %d\n",val+MBAtab2[code].val); }#endif return val + MBAtab2[code].val;}int getDClum(){ int code, size, val;#ifdef TRACE if (trace) printf("dct_dc_size_luminance: (");#endif /* decode length */ code = vs->showbits(5); if (code<31){ size = DClumtab0[code].val; vs->flushbits(DClumtab0[code].len);#ifdef TRACE if (trace){ printbits(code,5,DClumtab0[code].len); printf("): %d",size); }#endif } else { code = vs->showbits(9) - 0x1f0; size = DClumtab1[code].val; vs->flushbits(DClumtab1[code].len);#ifdef TRACE if (trace){ printbits(code+0x1f0,9,DClumtab1[code].len); printf("): %d",size); }#endif }#ifdef TRACE if (trace) printf(", dct_dc_differential (");#endif if (size==0) val = 0; else { val = vs->getbits(size);#ifdef TRACE if (trace) printbits(val,size,size);#endif if ((val & (1<<(size-1)))==0) val-= (1<<size) - 1; }#ifdef TRACE if (trace) printf("): %d\n",val);#endif return val;}int getDCchrom(){ int code, size, val;#ifdef TRACE if (trace) printf("dct_dc_size_chrominance: (");#endif /* decode length */ code = vs->showbits(5); if (code<31){ size = DCchromtab0[code].val; vs->flushbits(DCchromtab0[code].len);#ifdef TRACE if (trace){ printbits(code,5,DCchromtab0[code].len); printf("): %d",size); }#endif } else { code = vs->showbits(10) - 0x3e0; size = DCchromtab1[code].val; vs->flushbits(DCchromtab1[code].len);#ifdef TRACE if (trace){ printbits(code+0x3e0,10,DCchromtab1[code].len); printf("): %d",size); }#endif }#ifdef TRACE if (trace) printf(", dct_dc_differential (");#endif if (size==0) val = 0; else { val = vs->getbits(size);#ifdef TRACE if (trace) printbits(val,size,size);#endif if ((val & (1<<(size-1)))==0) val-= (1<<size) - 1; }#ifdef TRACE if (trace) printf("): %d\n",val);#endif return val;}?? 快捷鍵說明
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