ilbc_decode.cxx

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                                              1: normal */ 
   ){ 
       float data[BLOCKL_MAX]; 
       float lsfdeq[LPC_FILTERORDER*LPC_N_MAX]; 
       float PLCresidual[BLOCKL_MAX], PLClpc[LPC_FILTERORDER + 1]; 
       float zeros[BLOCKL_MAX], one[LPC_FILTERORDER + 1]; 
       int k, i, start, idxForMax, pos, lastpart, ulp; 
       int lag, ilag; 
       float cc, maxcc; 
       int idxVec[STATE_LEN]; 
       int check; 
       int gain_index[NASUB_MAX*CB_NSTAGES], extra_gain_index[CB_NSTAGES]; 
       int cb_index[CB_NSTAGES*NASUB_MAX], extra_cb_index[CB_NSTAGES]; 
       int lsf_i[LSF_NSPLIT*LPC_N_MAX]; 
       int state_first; 
       unsigned char *pbytes; 
       float weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX]; 
       int order_plus_one; 
       float syntdenum[NSUB_MAX*(LPC_FILTERORDER+1)];  
       float decresidual[BLOCKL_MAX]; 
        
       if (mode>0) { /* the data are good */ 
    
           /* decode data */ 
            
           pbytes=bytes; 
           pos=0; 
    
           /* Set everything to zero before decoding */ 
    
           for (k=0;k<LSF_NSPLIT*LPC_N_MAX;k++) { 
               lsf_i[k]=0; 
           } 
           start=0; 
           state_first=0; 
           idxForMax=0; 
           for (k=0; k<STATE_SHORT_LEN; k++) { 
               idxVec[k]=0; 
           } 
           for (k=0;k<CB_NSTAGES;k++) { 
               extra_cb_index[k]=0; 
           } 
     
           for (k=0;k<CB_NSTAGES;k++) { 
               extra_gain_index[k]=0; 
           } 
           for (i=0; i<NASUB; i++) { 
               for (k=0; k<CB_NSTAGES; k++) { 
                   cb_index[i*CB_NSTAGES+k]=0; 
               } 
           } 
           for (i=0; i<NASUB; i++) { 
               for (k=0; k<CB_NSTAGES; k++) { 
                   gain_index[i*CB_NSTAGES+k]=0; 
               } 
           } 
    
           /* loop over ULP classes */ 
    
           for (ulp=0; ulp<3; ulp++) { 
            
               /* LSF */ 
               for (k=0;k<6;k++) { 
                   unpack( &pbytes, &lastpart,  
                       ulp_lsf_bitsTbl[k][ulp], &pos); 
                   packcombine(&lsf_i[k], lastpart, 
                       ulp_lsf_bitsTbl[k][ulp]); 
               } 
    
               /* Start block info */ 
    
               unpack( &pbytes, &lastpart,  
                   ulp_start_bitsTbl[ulp], &pos); 
               packcombine(&start, lastpart,  
                   ulp_start_bitsTbl[ulp]); 
    
               unpack( &pbytes, &lastpart,  
                   ulp_startfirst_bitsTbl[ulp], &pos); 
               packcombine(&state_first, lastpart, 
                   ulp_startfirst_bitsTbl[ulp]); 
    
               unpack( &pbytes, &lastpart,  
                   ulp_scale_bitsTbl[ulp], &pos); 
               packcombine(&idxForMax, lastpart,  
                   ulp_scale_bitsTbl[ulp]); 
    
               for (k=0; k<STATE_SHORT_LEN; k++) { 
                   unpack( &pbytes, &lastpart,  
                       ulp_state_bitsTbl[ulp], &pos); 
                   packcombine(idxVec+k, lastpart, 
                       ulp_state_bitsTbl[ulp]); 
               } 
    
               /* 22 sample block */ 
    
               for (k=0;k<CB_NSTAGES;k++) { 
     
                   unpack( &pbytes, &lastpart,  
                       ulp_extra_cb_indexTbl[k][ulp], &pos); 
                   packcombine(extra_cb_index+k, lastpart,  
                       ulp_extra_cb_indexTbl[k][ulp]); 
               } 
               for (k=0;k<CB_NSTAGES;k++) { 
                   unpack( &pbytes, &lastpart,  
                       ulp_extra_cb_gainTbl[k][ulp], &pos); 
                   packcombine(extra_gain_index+k, lastpart, 
                       ulp_extra_cb_gainTbl[k][ulp]); 
               } 
                    
               /* The four 40 sample sub blocks */ 
    
               for (i=0; i<NASUB; i++) { 
                   for (k=0; k<CB_NSTAGES; k++) { 
                       unpack( &pbytes, &lastpart,  
                           ulp_cb_indexTbl[i][k][ulp], &pos); 
                       packcombine(cb_index+i*CB_NSTAGES+k, lastpart,  
                           ulp_cb_indexTbl[i][k][ulp]); 
                   } 
               } 
                
               for (i=0; i<NASUB; i++) { 
                   for (k=0; k<CB_NSTAGES; k++) { 
                       unpack( &pbytes, &lastpart,  
                           ulp_cb_gainTbl[i][k][ulp], &pos); 
                       packcombine(gain_index+i*CB_NSTAGES+k, lastpart,  
                           ulp_cb_gainTbl[i][k][ulp]); 
                   } 
               } 
           } 
    
           /* Check for bit errors */ 
           if( (start<1) || (start>5) ) 
               mode = 0; 
    
           if (mode==1) { /* No bit errors was detected,  
                             continue decoding */ 
                    
               /* adjust index */ 
               index_conv_dec(cb_index); 
    
               /* decode the lsf */ 
    
               SimplelsfDEQ(lsfdeq, lsf_i); 
               check=LSF_check(lsfdeq, LPC_FILTERORDER, LPC_N); 
               DecoderInterpolateLSF(syntdenum, weightdenum,  
                   lsfdeq, LPC_FILTERORDER, iLBCdec_inst); 
            
               Decode(decresidual, start, idxForMax, idxVec,  
                   syntdenum, cb_index, gain_index,  
                   extra_cb_index, extra_gain_index,  
     
                   state_first); 
    
               /* preparing the plc for a future loss! */ 
    
               doThePLC(PLCresidual, PLClpc, 0, decresidual,  
                   syntdenum + (LPC_FILTERORDER + 1)*(NSUB - 1), 
                   (*iLBCdec_inst).last_lag, iLBCdec_inst); 
    
            
               memcpy(decresidual, PLCresidual, BLOCKL*sizeof(float)); 
           } 
            
       } 
        
       if (mode == 0) { 
           /* the data is bad (either a PLC call 
            * was made or a bit error was detected) 
            */ 
            
           /* packet loss conceal */ 
    
           memset(zeros, 0, BLOCKL_MAX*sizeof(float)); 
            
           one[0] = 1; 
           memset(one+1, 0, LPC_FILTERORDER*sizeof(float)); 
            
           start=0; 
            
           doThePLC(PLCresidual, PLClpc, 1, zeros, one, 
               (*iLBCdec_inst).last_lag, iLBCdec_inst); 
           memcpy(decresidual, PLCresidual, BLOCKL*sizeof(float)); 
            
           order_plus_one = LPC_FILTERORDER + 1; 
           for (i = 0; i < NSUB; i++) { 
               memcpy(syntdenum+(i*order_plus_one), PLClpc,  
                   order_plus_one*sizeof(float)); 
           } 
       } 
    
       if ((*iLBCdec_inst).use_enhancer == 1) { 
    
           /* post filtering */ 
            
           (*iLBCdec_inst).last_lag =  
               enhancerInterface(data, decresidual, iLBCdec_inst); 
    
           /* synthesis filtering */ 
          /* if (iLBCdec_inst->mode==20) {*/
               /* Enhancer has 40 samples delay */
               i=0;
               syntFilter(data + i*SUBL,(*iLBCdec_inst).old_syntdenum
                   + (i+NSUB-1)*(LPC_FILTERORDER+1),
                   SUBL, (*iLBCdec_inst).syntMem);

               for (i=1; i < NSUB; i++) {
                   syntFilter(data + i*SUBL,
                       syntdenum + (i-1)*(LPC_FILTERORDER+1),
                       SUBL, (*iLBCdec_inst).syntMem);
               }
           
            
         /* 30ms 
          for (i=0; i < 2; i++) { 
               syntFilter(data + i*SUBL,  
                   (*iLBCdec_inst).old_syntdenum +  
                   (i+4)*(LPC_FILTERORDER+1), SUBL,  
                   (*iLBCdec_inst).syntMem); 
     
           } 
           for (i=2; i < NSUB; i++) { 
               syntFilter(data + i*SUBL,  
                   syntdenum + (i-2)*(LPC_FILTERORDER+1), SUBL,  
                   (*iLBCdec_inst).syntMem); 
           } */ 
    
       } else { 
    
           /* Find last lag */ 
           lag = 20; 
           maxcc = xCorrCoef(&decresidual[BLOCKL_MAX-ENH_BLOCKL],  
               &decresidual[BLOCKL_MAX-ENH_BLOCKL-lag], ENH_BLOCKL); 
            
           for (ilag=21; ilag<120; ilag++) { 
               cc = xCorrCoef(&decresidual[BLOCKL_MAX-ENH_BLOCKL],  
                   &decresidual[BLOCKL_MAX-ENH_BLOCKL-ilag], ENH_BLOCKL); 
            
               if (cc > maxcc) { 
                   maxcc = cc; 
                   lag = ilag; 
               } 
           } 
           (*iLBCdec_inst).last_lag = lag; 
    
           /* copy data and run synthesis filter */ 
    
           memcpy(data, decresidual, BLOCKL*sizeof(float)); 
           for (i=0; i < NSUB; i++) { 
               syntFilter(data + i*SUBL,  
                   syntdenum + i*(LPC_FILTERORDER+1), SUBL,  
                   (*iLBCdec_inst).syntMem); 
           } 
       } 
    
       /* high pass filtering on output if desired, otherwise  
          copy to out */ 
    
       /*hpOutput(data, BLOCKL, decblock, (*iLBCdec_inst).hpomem);*/ 
       memcpy(decblock,data,BLOCKL*sizeof(float)); 
    
       memcpy((*iLBCdec_inst).old_syntdenum, syntdenum,  
           NSUB*(LPC_FILTERORDER+1)*sizeof(float)); 
    
       iLBCdec_inst->prev_enh_pl=0; 
    
       if (mode==0) { /* PLC was used */ 
           iLBCdec_inst->prev_enh_pl=1; 
       } 
   }