ilbc_decode.c

开源的openh323的v1.18.0版,有1.19.0版无法编译过的朋友可以用这版

   
   /******************************************************************
   
       iLBC Speech Coder ANSI-C Source Code
   
       iLBC_decode.c 
   
       Copyright (C) The Internet Society (2004). 
       All Rights Reserved.
   
   ******************************************************************/
   
   #include <math.h>
   #include <stdlib.h>
   
   #include "iLBC_define.h"
   #include "StateConstructW.h"
   #include "LPCdecode.h"
   #include "iCBConstruct.h"
   #include "doCPLC.h"
   #include "helpfun.h"
   #include "constants.h"
   #include "packing.h"
   #include "string.h"
   #include "enhancer.h"
   #include "hpOutput.h"
   #include "syntFilter.h"
   
   /*----------------------------------------------------------------*
    *  Initiation of decoder instance.
    *---------------------------------------------------------------*/
   
   short initDecode(                   /* (o) Number of decoded 
                                              samples */
       iLBC_Dec_Inst_t *iLBCdec_inst,  /* (i/o) Decoder instance */
       int mode,                       /* (i) frame size mode */
       int use_enhancer                /* (i) 1 to use enhancer
                                              0 to run without 
                                                enhancer */
   ){
       int i;
   
       iLBCdec_inst->mode = mode;
   
       if (mode==30) {
           iLBCdec_inst->blockl = BLOCKL_30MS;
           iLBCdec_inst->nsub = NSUB_30MS;
           iLBCdec_inst->nasub = NASUB_30MS;
           iLBCdec_inst->lpc_n = LPC_N_30MS;
   
   
           iLBCdec_inst->no_of_bytes = NO_OF_BYTES_30MS;
           iLBCdec_inst->no_of_words = NO_OF_WORDS_30MS;
           iLBCdec_inst->state_short_len=STATE_SHORT_LEN_30MS;
           /* ULP init */
           iLBCdec_inst->ULP_inst=&ULP_30msTbl;
       }
       else if (mode==20) {
           iLBCdec_inst->blockl = BLOCKL_20MS;
           iLBCdec_inst->nsub = NSUB_20MS;
           iLBCdec_inst->nasub = NASUB_20MS;
           iLBCdec_inst->lpc_n = LPC_N_20MS;
           iLBCdec_inst->no_of_bytes = NO_OF_BYTES_20MS;
           iLBCdec_inst->no_of_words = NO_OF_WORDS_20MS;
           iLBCdec_inst->state_short_len=STATE_SHORT_LEN_20MS;
           /* ULP init */
           iLBCdec_inst->ULP_inst=&ULP_20msTbl;
       }
       else {
           exit(2);
       }
   
       memset(iLBCdec_inst->syntMem, 0, 
           LPC_FILTERORDER*sizeof(float));
       memcpy((*iLBCdec_inst).lsfdeqold, lsfmeanTbl, 
           LPC_FILTERORDER*sizeof(float));
   
       memset(iLBCdec_inst->old_syntdenum, 0, 
           ((LPC_FILTERORDER + 1)*NSUB_MAX)*sizeof(float));
       for (i=0; i<NSUB_MAX; i++)
           iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)]=1.0;
   
       iLBCdec_inst->last_lag = 20;
   
       iLBCdec_inst->prevLag = 120;
       iLBCdec_inst->per = 0.0;
       iLBCdec_inst->consPLICount = 0;
       iLBCdec_inst->prevPLI = 0;
       iLBCdec_inst->prevLpc[0] = 1.0;
       memset(iLBCdec_inst->prevLpc+1,0,
           LPC_FILTERORDER*sizeof(float));
       memset(iLBCdec_inst->prevResidual, 0, BLOCKL_MAX*sizeof(float));
       iLBCdec_inst->seed=777;
   
       memset(iLBCdec_inst->hpomem, 0, 4*sizeof(float));
   
       iLBCdec_inst->use_enhancer = use_enhancer;
       memset(iLBCdec_inst->enh_buf, 0, ENH_BUFL*sizeof(float));
       for (i=0;i<ENH_NBLOCKS_TOT;i++) 
           iLBCdec_inst->enh_period[i]=(float)40.0;
   
       iLBCdec_inst->prev_enh_pl = 0;
   
       return (iLBCdec_inst->blockl);
   }
   
   
   
   /*----------------------------------------------------------------*
    *  frame residual decoder function (subrutine to iLBC_decode) 
    *---------------------------------------------------------------*/
   
   void Decode(
       iLBC_Dec_Inst_t *iLBCdec_inst,  /* (i/o) the decoder state 
                                                structure */
       float *decresidual,             /* (o) decoded residual frame */
       int start,                      /* (i) location of start 
                                              state */
       int idxForMax,                  /* (i) codebook index for the 
                                              maximum value */
       int *idxVec,                /* (i) codebook indexes for the 
                                              samples  in the start 
                                              state */
       float *syntdenum,               /* (i) the decoded synthesis
                                              filter coefficients */
       int *cb_index,                  /* (i) the indexes for the 
                                              adaptive codebook */
       int *gain_index,            /* (i) the indexes for the 
                                              corresponding gains */
       int *extra_cb_index,        /* (i) the indexes for the 
                                              adaptive codebook part 
                                              of start state */
       int *extra_gain_index,          /* (i) the indexes for the 
                                              corresponding gains */
       int state_first                 /* (i) 1 if non adaptive part 
                                              of start state comes 
                                              first 0 if that part 
                                              comes last */
   ){
       float reverseDecresidual[BLOCKL_MAX], mem[CB_MEML];
       int k, meml_gotten, Nfor, Nback, i;
       int diff, start_pos;
       int subcount, subframe;
   
       diff = STATE_LEN - iLBCdec_inst->state_short_len;
       
       if (state_first == 1) {
           start_pos = (start-1)*SUBL;
       } else {
           start_pos = (start-1)*SUBL + diff;
       }
   
       /* decode scalar part of start state */
   
       StateConstructW(idxForMax, idxVec, 
           &syntdenum[(start-1)*(LPC_FILTERORDER+1)], 
           &decresidual[start_pos], iLBCdec_inst->state_short_len);
   
       
       if (state_first) { /* put adaptive part in the end */
                   
   
   
           /* setup memory */
   
           memset(mem, 0, 
               (CB_MEML-iLBCdec_inst->state_short_len)*sizeof(float));
           memcpy(mem+CB_MEML-iLBCdec_inst->state_short_len, 
               decresidual+start_pos, 
               iLBCdec_inst->state_short_len*sizeof(float));
           
           /* construct decoded vector */
   
           iCBConstruct(
               &decresidual[start_pos+iLBCdec_inst->state_short_len],
               extra_cb_index, extra_gain_index, mem+CB_MEML-stMemLTbl,
               stMemLTbl, diff, CB_NSTAGES);
       
       } 
       else {/* put adaptive part in the beginning */
           
           /* create reversed vectors for prediction */
   
           for (k=0; k<diff; k++) {
               reverseDecresidual[k] = 
                   decresidual[(start+1)*SUBL-1-
                           (k+iLBCdec_inst->state_short_len)];
           }
           
           /* setup memory */
   
           meml_gotten = iLBCdec_inst->state_short_len;
           for (k=0; k<meml_gotten; k++){ 
               mem[CB_MEML-1-k] = decresidual[start_pos + k];
           } 
           memset(mem, 0, (CB_MEML-k)*sizeof(float));
           
           /* construct decoded vector */
   
           iCBConstruct(reverseDecresidual, extra_cb_index, 
               extra_gain_index, mem+CB_MEML-stMemLTbl, stMemLTbl,
               diff, CB_NSTAGES);
           
           /* get decoded residual from reversed vector */
   
           for (k=0; k<diff; k++) {
               decresidual[start_pos-1-k] = reverseDecresidual[k];
           }
       }
   
       /* counter for predicted sub-frames */
   
       subcount=0;
   
       /* forward prediction of sub-frames */
   
       Nfor = iLBCdec_inst->nsub-start-1;
   
   
       
       if ( Nfor > 0 ){
           
           /* setup memory */
   
           memset(mem, 0, (CB_MEML-STATE_LEN)*sizeof(float));
           memcpy(mem+CB_MEML-STATE_LEN, decresidual+(start-1)*SUBL,
               STATE_LEN*sizeof(float));
   
           /* loop over sub-frames to encode */
   
           for (subframe=0; subframe<Nfor; subframe++) {
               
               /* construct decoded vector */
   
               iCBConstruct(&decresidual[(start+1+subframe)*SUBL], 
                   cb_index+subcount*CB_NSTAGES, 
                   gain_index+subcount*CB_NSTAGES, 
                   mem+CB_MEML-memLfTbl[subcount], 
                   memLfTbl[subcount], SUBL, CB_NSTAGES);
   
               /* update memory */
   
               memcpy(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float));
               memcpy(mem+CB_MEML-SUBL, 
                   &decresidual[(start+1+subframe)*SUBL],
                   SUBL*sizeof(float));
   
               subcount++;
   
           }
   
       }
       
       /* backward prediction of sub-frames */
   
       Nback = start-1;
   
       if ( Nback > 0 ) {
   
           /* setup memory */
   
           meml_gotten = SUBL*(iLBCdec_inst->nsub+1-start);
           
           if ( meml_gotten > CB_MEML ) { 
               meml_gotten=CB_MEML;
           }
           for (k=0; k<meml_gotten; k++) { 
               mem[CB_MEML-1-k] = decresidual[(start-1)*SUBL + k];
           }
           memset(mem, 0, (CB_MEML-k)*sizeof(float));
   
           /* loop over subframes to decode */
   
   
   
           for (subframe=0; subframe<Nback; subframe++) {
               
               /* construct decoded vector */
   
               iCBConstruct(&reverseDecresidual[subframe*SUBL], 
                   cb_index+subcount*CB_NSTAGES, 
                   gain_index+subcount*CB_NSTAGES, 
                   mem+CB_MEML-memLfTbl[subcount], memLfTbl[subcount], 
                   SUBL, CB_NSTAGES);
   
               /* update memory */
   
               memcpy(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float));
               memcpy(mem+CB_MEML-SUBL, 
                   &reverseDecresidual[subframe*SUBL],
                   SUBL*sizeof(float));
   
               subcount++;
           }
   
           /* get decoded residual from reversed vector */
   
           for (i=0; i<SUBL*Nback; i++)
               decresidual[SUBL*Nback - i - 1] = 
               reverseDecresidual[i];
       }
   }
   
   /*----------------------------------------------------------------*
    *  main decoder function 
    *---------------------------------------------------------------*/
   
   void iLBC_decode( 
       float *decblock,            /* (o) decoded signal block */
       unsigned char *bytes,           /* (i) encoded signal bits */