Example #1
0
void WebRtcIlbcfix_MyCorr(
    int32_t *corr,  /* (o) correlation of seq1 and seq2 */
    int16_t *seq1,  /* (i) first sequence */
    int16_t dim1,  /* (i) dimension first seq1 */
    const int16_t *seq2, /* (i) second sequence */
    int16_t dim2   /* (i) dimension seq2 */
                          ){
  int16_t max, scale, loops;

  /* Calculate correlation between the two sequences. Scale the
     result of the multiplcication to maximum 26 bits in order
     to avoid overflow */
  max=WebRtcSpl_MaxAbsValueW16(seq1, dim1);
  scale=WebRtcSpl_GetSizeInBits(max);

  scale = (int16_t)(WEBRTC_SPL_MUL_16_16(2,scale)-26);
  if (scale<0) {
    scale=0;
  }

  loops=dim1-dim2+1;

  /* Calculate the cross correlations */
  WebRtcSpl_CrossCorrelation(corr, (int16_t*)seq2, seq1, dim2, loops, scale, 1);

  return;
}
int WebRtcSpl_AutoCorrelation(const int16_t* in_vector,
                              int in_vector_length,
                              int order,
                              int32_t* result,
                              int* scale) {
  int32_t sum = 0;
  int i = 0, j = 0;
  int16_t smax = 0;
  int scaling = 0;

  if (order > in_vector_length) {
    /* Undefined */
    return -1;
  } else if (order < 0) {
    order = in_vector_length;
  }

  // Find the maximum absolute value of the samples.
  smax = WebRtcSpl_MaxAbsValueW16(in_vector, in_vector_length);

  // In order to avoid overflow when computing the sum we should scale the
  // samples so that (in_vector_length * smax * smax) will not overflow.
  if (smax == 0) {
    scaling = 0;
  } else {
    // Number of bits in the sum loop.
    int nbits = WebRtcSpl_GetSizeInBits((uint32_t)in_vector_length);
    // Number of bits to normalize smax.
    int t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax));

    if (t > nbits) {
      scaling = 0;
    } else {
      scaling = nbits - t;
    }
  }

  // Perform the actual correlation calculation.
  for (i = 0; i < order + 1; i++) {
    sum = 0;
    /* Unroll the loop to improve performance. */
    for (j = 0; i + j + 3 < in_vector_length; j += 4) {
      sum += (in_vector[j + 0] * in_vector[i + j + 0]) >> scaling;
      sum += (in_vector[j + 1] * in_vector[i + j + 1]) >> scaling;
      sum += (in_vector[j + 2] * in_vector[i + j + 2]) >> scaling;
      sum += (in_vector[j + 3] * in_vector[i + j + 3]) >> scaling;
    }
    for (; j < in_vector_length - i; j++) {
      sum += (in_vector[j] * in_vector[i + j]) >> scaling;
    }
    *result++ = sum;
  }

  *scale = scaling;
  return order + 1;
}
Example #3
0
void WebRtcIlbcfix_EncodeImpl(
    WebRtc_UWord16 *bytes,     /* (o) encoded data bits iLBC */
    const WebRtc_Word16 *block, /* (i) speech vector to encode */
    iLBC_Enc_Inst_t *iLBCenc_inst /* (i/o) the general encoder
                                     state */
                          ){
  int n, meml_gotten, Nfor, Nback;
  WebRtc_Word16 diff, start_pos;
  int index;
  int subcount, subframe;
  WebRtc_Word16 start_count, end_count;
  WebRtc_Word16 *residual;
  WebRtc_Word32 en1, en2;
  WebRtc_Word16 scale, max;
  WebRtc_Word16 *syntdenum;
  WebRtc_Word16 *decresidual;
  WebRtc_Word16 *reverseResidual;
  WebRtc_Word16 *reverseDecresidual;
  /* Stack based */
  WebRtc_Word16 weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
  WebRtc_Word16 dataVec[BLOCKL_MAX + LPC_FILTERORDER];
  WebRtc_Word16 memVec[CB_MEML+CB_FILTERLEN];
  WebRtc_Word16 bitsMemory[sizeof(iLBC_bits)/sizeof(WebRtc_Word16)];
  iLBC_bits *iLBCbits_inst = (iLBC_bits*)bitsMemory;


#ifdef SPLIT_10MS
  WebRtc_Word16 *weightdenumbuf = iLBCenc_inst->weightdenumbuf;
  WebRtc_Word16 last_bit;
#endif

  WebRtc_Word16 *data = &dataVec[LPC_FILTERORDER];
  WebRtc_Word16 *mem = &memVec[CB_HALFFILTERLEN];

  /* Reuse som buffers to save stack memory */
  residual = &iLBCenc_inst->lpc_buffer[LPC_LOOKBACK+BLOCKL_MAX-iLBCenc_inst->blockl];
  syntdenum = mem;      /* syntdenum[(LPC_FILTERORDER + 1)*NSUB_MAX] and mem are used non overlapping in the code */
  decresidual = residual;     /* Already encoded residual is overwritten by the decoded version */
  reverseResidual = data;     /* data and reverseResidual are used non overlapping in the code */
  reverseDecresidual = reverseResidual; /* Already encoded residual is overwritten by the decoded version */

#ifdef SPLIT_10MS

  WebRtcSpl_MemSetW16 (  (WebRtc_Word16 *) iLBCbits_inst, 0,
                         (WebRtc_Word16) (sizeof(iLBC_bits) / sizeof(WebRtc_Word16))  );

  start_pos = iLBCenc_inst->start_pos;
  diff = iLBCenc_inst->diff;

  if (iLBCenc_inst->section != 0){
    WEBRTC_SPL_MEMCPY_W16 (weightdenum, weightdenumbuf,
                           SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
    /* Un-Packetize the frame into parameters */
    last_bit = WebRtcIlbcfix_UnpackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
    if (last_bit)
      return;
    /* adjust index */
    WebRtcIlbcfix_IndexConvDec (iLBCbits_inst->cb_index);

    if (iLBCenc_inst->section == 1){
      /* Save first 80 samples of a 160/240 sample frame for 20/30msec */
      WEBRTC_SPL_MEMCPY_W16 (iLBCenc_inst->past_samples, block, 80);
    }
    else{ // iLBCenc_inst->section == 2 AND mode = 30ms
      /* Save second 80 samples of a 240 sample frame for 30msec */
      WEBRTC_SPL_MEMCPY_W16 (iLBCenc_inst->past_samples + 80, block, 80);
    }
  }
  else{ // iLBCenc_inst->section == 0
    /* form a complete frame of 160/240 for 20msec/30msec mode */
    WEBRTC_SPL_MEMCPY_W16 (data + (iLBCenc_inst->mode * 8) - 80, block, 80);
    WEBRTC_SPL_MEMCPY_W16 (data, iLBCenc_inst->past_samples,
                           (iLBCenc_inst->mode * 8) - 80);
    iLBCenc_inst->Nfor_flag = 0;
    iLBCenc_inst->Nback_flag = 0;
#else
    /* copy input block to data*/
    WEBRTC_SPL_MEMCPY_W16(data,block,iLBCenc_inst->blockl);
#endif

    /* high pass filtering of input signal and scale down the residual (*0.5) */
    WebRtcIlbcfix_HpInput(data, (WebRtc_Word16*)WebRtcIlbcfix_kHpInCoefs,
                          iLBCenc_inst->hpimemy, iLBCenc_inst->hpimemx,
                          iLBCenc_inst->blockl);

    /* LPC of hp filtered input data */
    WebRtcIlbcfix_LpcEncode(syntdenum, weightdenum, iLBCbits_inst->lsf, data,
                            iLBCenc_inst);

    /* Set up state */
    WEBRTC_SPL_MEMCPY_W16(dataVec, iLBCenc_inst->anaMem, LPC_FILTERORDER);

    /* inverse filter to get residual */
    for (n=0; n<iLBCenc_inst->nsub; n++ ) {
      WebRtcSpl_FilterMAFastQ12(
          &data[n*SUBL], &residual[n*SUBL],
          &syntdenum[n*(LPC_FILTERORDER+1)],
          LPC_FILTERORDER+1, SUBL);
    }

    /* Copy the state for next frame */
    WEBRTC_SPL_MEMCPY_W16(iLBCenc_inst->anaMem, &data[iLBCenc_inst->blockl-LPC_FILTERORDER], LPC_FILTERORDER);

    /* find state location */

    iLBCbits_inst->startIdx = WebRtcIlbcfix_FrameClassify(iLBCenc_inst,residual);

    /* check if state should be in first or last part of the
       two subframes */

    index = (iLBCbits_inst->startIdx-1)*SUBL;
    max=WebRtcSpl_MaxAbsValueW16(&residual[index], 2*SUBL);
    scale=WebRtcSpl_GetSizeInBits(WEBRTC_SPL_MUL_16_16(max,max));

    /* Scale to maximum 25 bits so that the MAC won't cause overflow */
    scale = scale - 25;
    if(scale < 0) {
      scale = 0;
    }

    diff = STATE_LEN - iLBCenc_inst->state_short_len;
    en1=WebRtcSpl_DotProductWithScale(&residual[index], &residual[index],
                                      iLBCenc_inst->state_short_len, scale);
    index += diff;
    en2=WebRtcSpl_DotProductWithScale(&residual[index], &residual[index],
                                      iLBCenc_inst->state_short_len, scale);
    if (en1 > en2) {
      iLBCbits_inst->state_first = 1;
      start_pos = (iLBCbits_inst->startIdx-1)*SUBL;
    } else {
      iLBCbits_inst->state_first = 0;
      start_pos = (iLBCbits_inst->startIdx-1)*SUBL + diff;
    }

    /* scalar quantization of state */

    WebRtcIlbcfix_StateSearch(iLBCenc_inst, iLBCbits_inst, &residual[start_pos],
                              &syntdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)],
                              &weightdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)]);

    WebRtcIlbcfix_StateConstruct(iLBCbits_inst->idxForMax, iLBCbits_inst->idxVec,
                                 &syntdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)],
                                 &decresidual[start_pos], iLBCenc_inst->state_short_len
                                 );

    /* predictive quantization in state */

    if (iLBCbits_inst->state_first) { /* put adaptive part in the end */

      /* setup memory */

      WebRtcSpl_MemSetW16(mem, 0, (WebRtc_Word16)(CB_MEML-iLBCenc_inst->state_short_len));
      WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-iLBCenc_inst->state_short_len,
                            decresidual+start_pos, iLBCenc_inst->state_short_len);

      /* encode subframes */

      WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
                             &residual[start_pos+iLBCenc_inst->state_short_len],
                             mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL, diff,
                             &weightdenum[iLBCbits_inst->startIdx*(LPC_FILTERORDER+1)], 0);

      /* construct decoded vector */

      WebRtcIlbcfix_CbConstruct(&decresidual[start_pos+iLBCenc_inst->state_short_len],
                                iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
                                mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL,
                                diff
                                );

    }
    else { /* put adaptive part in the beginning */

      /* create reversed vectors for prediction */

      WebRtcSpl_MemCpyReversedOrder(&reverseResidual[diff-1],
                                    &residual[(iLBCbits_inst->startIdx+1)*SUBL-STATE_LEN], diff);

      /* setup memory */

      meml_gotten = iLBCenc_inst->state_short_len;
      WebRtcSpl_MemCpyReversedOrder(&mem[CB_MEML-1], &decresidual[start_pos], meml_gotten);
      WebRtcSpl_MemSetW16(mem, 0, (WebRtc_Word16)(CB_MEML-iLBCenc_inst->state_short_len));

      /* encode subframes */
      WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
                             reverseResidual, mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL, diff,
                             &weightdenum[(iLBCbits_inst->startIdx-1)*(LPC_FILTERORDER+1)],
                             0);

      /* construct decoded vector */

      WebRtcIlbcfix_CbConstruct(reverseDecresidual,
                                iLBCbits_inst->cb_index, iLBCbits_inst->gain_index,
                                mem+CB_MEML-ST_MEM_L_TBL, ST_MEM_L_TBL,
                                diff
                                );

      /* get decoded residual from reversed vector */

      WebRtcSpl_MemCpyReversedOrder(&decresidual[start_pos-1], reverseDecresidual, diff);
    }

#ifdef SPLIT_10MS
    iLBCenc_inst->start_pos = start_pos;
    iLBCenc_inst->diff = diff;
    iLBCenc_inst->section++;
    /* adjust index */
    WebRtcIlbcfix_IndexConvEnc (iLBCbits_inst->cb_index);
    /* Packetize the parameters into the frame */
    WebRtcIlbcfix_PackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
    WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum,
                           SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
    return;
  }
#endif

  /* forward prediction of subframes */

  Nfor = iLBCenc_inst->nsub-iLBCbits_inst->startIdx-1;

  /* counter for predicted subframes */
#ifdef SPLIT_10MS
  if (iLBCenc_inst->mode == 20)
  {
    subcount = 1;
  }
  if (iLBCenc_inst->mode == 30)
  {
    if (iLBCenc_inst->section == 1)
    {
      subcount = 1;
    }
    if (iLBCenc_inst->section == 2)
    {
      subcount = 3;
    }
  }
#else
  subcount=1;
#endif

  if( Nfor > 0 ){

    /* setup memory */

    WebRtcSpl_MemSetW16(mem, 0, CB_MEML-STATE_LEN);
    WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-STATE_LEN,
                          decresidual+(iLBCbits_inst->startIdx-1)*SUBL, STATE_LEN);

#ifdef SPLIT_10MS
    if (iLBCenc_inst->Nfor_flag > 0)
    {
      for (subframe = 0; subframe < WEBRTC_SPL_MIN (Nfor, 2); subframe++)
      {
        /* update memory */
        WEBRTC_SPL_MEMCPY_W16 (mem, mem + SUBL, (CB_MEML - SUBL));
        WEBRTC_SPL_MEMCPY_W16 (mem + CB_MEML - SUBL,
                               &decresidual[(iLBCbits_inst->startIdx + 1 +
                                             subframe) * SUBL], SUBL);
      }
    }

    iLBCenc_inst->Nfor_flag++;

    if (iLBCenc_inst->mode == 20)
    {
      start_count = 0;
      end_count = Nfor;
    }
    if (iLBCenc_inst->mode == 30)
    {
      if (iLBCenc_inst->section == 1)
      {
        start_count = 0;
        end_count = WEBRTC_SPL_MIN (Nfor, 2);
      }
      if (iLBCenc_inst->section == 2)
      {
        start_count = WEBRTC_SPL_MIN (Nfor, 2);
        end_count = Nfor;
      }
    }
#else
    start_count = 0;
    end_count = (WebRtc_Word16)Nfor;
#endif

    /* loop over subframes to encode */

    for (subframe = start_count; subframe < end_count; subframe++){

      /* encode subframe */

      WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
                             iLBCbits_inst->gain_index+subcount*CB_NSTAGES,
                             &residual[(iLBCbits_inst->startIdx+1+subframe)*SUBL],
                             mem, MEM_LF_TBL, SUBL,
                             &weightdenum[(iLBCbits_inst->startIdx+1+subframe)*(LPC_FILTERORDER+1)],
                             (WebRtc_Word16)subcount);

      /* construct decoded vector */

      WebRtcIlbcfix_CbConstruct(&decresidual[(iLBCbits_inst->startIdx+1+subframe)*SUBL],
                                iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
                                iLBCbits_inst->gain_index+subcount*CB_NSTAGES,
                                mem, MEM_LF_TBL,
                                SUBL
                                );

      /* update memory */

      WEBRTC_SPL_MEMMOVE_W16(mem, mem+SUBL, (CB_MEML-SUBL));
      WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-SUBL,
                            &decresidual[(iLBCbits_inst->startIdx+1+subframe)*SUBL], SUBL);

      subcount++;
    }
  }

#ifdef SPLIT_10MS
  if ((iLBCenc_inst->section == 1) &&
      (iLBCenc_inst->mode == 30) && (Nfor > 0) && (end_count == 2))
  {
    iLBCenc_inst->section++;
    /* adjust index */
    WebRtcIlbcfix_IndexConvEnc (iLBCbits_inst->cb_index);
    /* Packetize the parameters into the frame */
    WebRtcIlbcfix_PackBits (iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
    WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum,
                           SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
    return;
  }
#endif

  /* backward prediction of subframes */

  Nback = iLBCbits_inst->startIdx-1;

  if( Nback > 0 ){

    /* create reverse order vectors
       (The decresidual does not need to be copied since it is
       contained in the same vector as the residual)
    */

    WebRtcSpl_MemCpyReversedOrder(&reverseResidual[Nback*SUBL-1], residual, Nback*SUBL);

    /* setup memory */

    meml_gotten = SUBL*(iLBCenc_inst->nsub+1-iLBCbits_inst->startIdx);
    if( meml_gotten > CB_MEML ) {
      meml_gotten=CB_MEML;
    }

    WebRtcSpl_MemCpyReversedOrder(&mem[CB_MEML-1], &decresidual[Nback*SUBL], meml_gotten);
    WebRtcSpl_MemSetW16(mem, 0, (WebRtc_Word16)(CB_MEML-meml_gotten));

#ifdef SPLIT_10MS
    if (iLBCenc_inst->Nback_flag > 0)
    {
      for (subframe = 0; subframe < WEBRTC_SPL_MAX (2 - Nfor, 0); subframe++)
      {
        /* update memory */
        WEBRTC_SPL_MEMCPY_W16 (mem, mem + SUBL, (CB_MEML - SUBL));
        WEBRTC_SPL_MEMCPY_W16 (mem + CB_MEML - SUBL,
                               &reverseDecresidual[subframe * SUBL], SUBL);
      }
    }

    iLBCenc_inst->Nback_flag++;


    if (iLBCenc_inst->mode == 20)
    {
      start_count = 0;
      end_count = Nback;
    }
    if (iLBCenc_inst->mode == 30)
    {
      if (iLBCenc_inst->section == 1)
      {
        start_count = 0;
        end_count = WEBRTC_SPL_MAX (2 - Nfor, 0);
      }
      if (iLBCenc_inst->section == 2)
      {
        start_count = WEBRTC_SPL_MAX (2 - Nfor, 0);
        end_count = Nback;
      }
    }
#else
    start_count = 0;
    end_count = (WebRtc_Word16)Nback;
#endif

    /* loop over subframes to encode */

    for (subframe = start_count; subframe < end_count; subframe++){

      /* encode subframe */

      WebRtcIlbcfix_CbSearch(iLBCenc_inst, iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
                             iLBCbits_inst->gain_index+subcount*CB_NSTAGES, &reverseResidual[subframe*SUBL],
                             mem, MEM_LF_TBL, SUBL,
                             &weightdenum[(iLBCbits_inst->startIdx-2-subframe)*(LPC_FILTERORDER+1)],
                             (WebRtc_Word16)subcount);

      /* construct decoded vector */

      WebRtcIlbcfix_CbConstruct(&reverseDecresidual[subframe*SUBL],
                                iLBCbits_inst->cb_index+subcount*CB_NSTAGES,
                                iLBCbits_inst->gain_index+subcount*CB_NSTAGES,
                                mem, MEM_LF_TBL, SUBL
                                );

      /* update memory */

      WEBRTC_SPL_MEMMOVE_W16(mem, mem+SUBL, (CB_MEML-SUBL));
      WEBRTC_SPL_MEMCPY_W16(mem+CB_MEML-SUBL,
                            &reverseDecresidual[subframe*SUBL], SUBL);

      subcount++;

    }

    /* get decoded residual from reversed vector */

    WebRtcSpl_MemCpyReversedOrder(&decresidual[SUBL*Nback-1], reverseDecresidual, SUBL*Nback);
  }
  /* end encoding part */

  /* adjust index */

  WebRtcIlbcfix_IndexConvEnc(iLBCbits_inst->cb_index);

  /* Packetize the parameters into the frame */

#ifdef SPLIT_10MS
  if( (iLBCenc_inst->mode==30) && (iLBCenc_inst->section==1) ){
    WebRtcIlbcfix_PackBits(iLBCenc_inst->bytes, iLBCbits_inst, iLBCenc_inst->mode);
  }
  else{
    WebRtcIlbcfix_PackBits(bytes, iLBCbits_inst, iLBCenc_inst->mode);
  }
#else
  WebRtcIlbcfix_PackBits(bytes, iLBCbits_inst, iLBCenc_inst->mode);
#endif

#ifndef WEBRTC_BIG_ENDIAN
  /* Swap bytes for LITTLE ENDIAN since the packbits()
     function assumes BIG_ENDIAN machine */
#ifdef SPLIT_10MS
  if (( (iLBCenc_inst->section == 1) && (iLBCenc_inst->mode == 20) ) ||
      ( (iLBCenc_inst->section == 2) && (iLBCenc_inst->mode == 30) )){
    WebRtcIlbcfix_SwapBytes(bytes, iLBCenc_inst->no_of_words, bytes);
  }
#else
  WebRtcIlbcfix_SwapBytes(bytes, iLBCenc_inst->no_of_words, bytes);
#endif
#endif

#ifdef SPLIT_10MS
  if (subcount == (iLBCenc_inst->nsub - 1))
  {
    iLBCenc_inst->section = 0;
  }
  else
  {
    iLBCenc_inst->section++;
    WEBRTC_SPL_MEMCPY_W16 (weightdenumbuf, weightdenum,
                           SCRATCH_ENCODE_DATAVEC - SCRATCH_ENCODE_WEIGHTDENUM);
  }
#endif

}
Example #4
0
int WebRtcIlbcfix_XcorrCoef(
    WebRtc_Word16 *target,  /* (i) first array */
    WebRtc_Word16 *regressor, /* (i) second array */
    WebRtc_Word16 subl,  /* (i) dimension arrays */
    WebRtc_Word16 searchLen, /* (i) the search lenght */
    WebRtc_Word16 offset,  /* (i) samples offset between arrays */
    WebRtc_Word16 step   /* (i) +1 or -1 */
                            ){
  int k;
  WebRtc_Word16 maxlag;
  WebRtc_Word16 pos;
  WebRtc_Word16 max;
  WebRtc_Word16 crossCorrScale, Energyscale;
  WebRtc_Word16 crossCorrSqMod, crossCorrSqMod_Max;
  WebRtc_Word32 crossCorr, Energy;
  WebRtc_Word16 crossCorrmod, EnergyMod, EnergyMod_Max;
  WebRtc_Word16 *tp, *rp;
  WebRtc_Word16 *rp_beg, *rp_end;
  WebRtc_Word16 totscale, totscale_max;
  WebRtc_Word16 scalediff;
  WebRtc_Word32 newCrit, maxCrit;
  int shifts;

  /* Initializations, to make sure that the first one is selected */
  crossCorrSqMod_Max=0;
  EnergyMod_Max=WEBRTC_SPL_WORD16_MAX;
  totscale_max=-500;
  maxlag=0;
  pos=0;

  /* Find scale value and start position */
  if (step==1) {
    max=WebRtcSpl_MaxAbsValueW16(regressor, (WebRtc_Word16)(subl+searchLen-1));
    rp_beg = regressor;
    rp_end = &regressor[subl];
  } else { /* step==-1 */
    max=WebRtcSpl_MaxAbsValueW16(&regressor[-searchLen], (WebRtc_Word16)(subl+searchLen-1));
    rp_beg = &regressor[-1];
    rp_end = &regressor[subl-1];
  }

  /* Introduce a scale factor on the Energy in WebRtc_Word32 in
     order to make sure that the calculation does not
     overflow */

  if (max>5000) {
    shifts=2;
  } else {
    shifts=0;
  }

  /* Calculate the first energy, then do a +/- to get the other energies */
  Energy=WebRtcSpl_DotProductWithScale(regressor, regressor, subl, shifts);

  for (k=0;k<searchLen;k++) {
    tp = target;
    rp = &regressor[pos];

    crossCorr=WebRtcSpl_DotProductWithScale(tp, rp, subl, shifts);

    if ((Energy>0)&&(crossCorr>0)) {

      /* Put cross correlation and energy on 16 bit word */
      crossCorrScale=(WebRtc_Word16)WebRtcSpl_NormW32(crossCorr)-16;
      crossCorrmod=(WebRtc_Word16)WEBRTC_SPL_SHIFT_W32(crossCorr, crossCorrScale);
      Energyscale=(WebRtc_Word16)WebRtcSpl_NormW32(Energy)-16;
      EnergyMod=(WebRtc_Word16)WEBRTC_SPL_SHIFT_W32(Energy, Energyscale);

      /* Square cross correlation and store upper WebRtc_Word16 */
      crossCorrSqMod=(WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(crossCorrmod, crossCorrmod, 16);

      /* Calculate the total number of (dynamic) right shifts that have
         been performed on (crossCorr*crossCorr)/energy
      */
      totscale=Energyscale-(crossCorrScale<<1);

      /* Calculate the shift difference in order to be able to compare the two
         (crossCorr*crossCorr)/energy in the same domain
      */
      scalediff=totscale-totscale_max;
      scalediff=WEBRTC_SPL_MIN(scalediff,31);
      scalediff=WEBRTC_SPL_MAX(scalediff,-31);

      /* Compute the cross multiplication between the old best criteria
         and the new one to be able to compare them without using a
         division */

      if (scalediff<0) {
        newCrit = ((WebRtc_Word32)crossCorrSqMod*EnergyMod_Max)>>(-scalediff);
        maxCrit = ((WebRtc_Word32)crossCorrSqMod_Max*EnergyMod);
      } else {
Example #5
0
void WebRtcIlbcfix_CbSearch(
    IlbcEncoder *iLBCenc_inst,
    /* (i) the encoder state structure */
    int16_t *index,  /* (o) Codebook indices */
    int16_t *gain_index, /* (o) Gain quantization indices */
    int16_t *intarget, /* (i) Target vector for encoding */
    int16_t *decResidual,/* (i) Decoded residual for codebook construction */
    int16_t lMem,  /* (i) Length of buffer */
    int16_t lTarget,  /* (i) Length of vector */
    int16_t *weightDenum,/* (i) weighting filter coefficients in Q12 */
    int16_t block  /* (i) the subblock number */
                            ) {
  int16_t i, j, stage, range;
  int16_t *pp, scale, tmp;
  int16_t bits, temp1, temp2;
  int16_t base_size;
  int32_t codedEner, targetEner;
  int16_t gains[CB_NSTAGES+1];
  int16_t *cb_vecPtr;
  int16_t indexOffset, sInd, eInd;
  int32_t CritMax=0;
  int16_t shTotMax=WEBRTC_SPL_WORD16_MIN;
  int16_t bestIndex=0;
  int16_t bestGain=0;
  int16_t indexNew, CritNewSh;
  int32_t CritNew;
  int32_t *cDotPtr;
  int16_t noOfZeros;
  int16_t *gainPtr;
  int32_t t32, tmpW32;
  int16_t *WebRtcIlbcfix_kGainSq5_ptr;
  /* Stack based */
  int16_t CBbuf[CB_MEML+LPC_FILTERORDER+CB_HALFFILTERLEN];
  int32_t cDot[128];
  int32_t Crit[128];
  int16_t targetVec[SUBL+LPC_FILTERORDER];
  int16_t cbvectors[CB_MEML + 1];  /* Adding one extra position for
                                            Coverity warnings. */
  int16_t codedVec[SUBL];
  int16_t interpSamples[20*4];
  int16_t interpSamplesFilt[20*4];
  int16_t energyW16[CB_EXPAND*128];
  int16_t energyShifts[CB_EXPAND*128];
  int16_t *inverseEnergy=energyW16;   /* Reuse memory */
  int16_t *inverseEnergyShifts=energyShifts; /* Reuse memory */
  int16_t *buf = &CBbuf[LPC_FILTERORDER];
  int16_t *target = &targetVec[LPC_FILTERORDER];
  int16_t *aug_vec = (int16_t*)cDot;   /* length [SUBL], reuse memory */

  /* Determine size of codebook sections */

  base_size=lMem-lTarget+1;
  if (lTarget==SUBL) {
    base_size=lMem-19;
  }

  /* weighting of the CB memory */
  noOfZeros=lMem-WebRtcIlbcfix_kFilterRange[block];
  WebRtcSpl_MemSetW16(&buf[-LPC_FILTERORDER], 0, noOfZeros+LPC_FILTERORDER);
  WebRtcSpl_FilterARFastQ12(
      decResidual+noOfZeros, buf+noOfZeros,
      weightDenum, LPC_FILTERORDER+1, WebRtcIlbcfix_kFilterRange[block]);

  /* weighting of the target vector */
  WEBRTC_SPL_MEMCPY_W16(&target[-LPC_FILTERORDER], buf+noOfZeros+WebRtcIlbcfix_kFilterRange[block]-LPC_FILTERORDER, LPC_FILTERORDER);
  WebRtcSpl_FilterARFastQ12(
      intarget, target,
      weightDenum, LPC_FILTERORDER+1, lTarget);

  /* Store target, towards the end codedVec is calculated as
     the initial target minus the remaining target */
  WEBRTC_SPL_MEMCPY_W16(codedVec, target, lTarget);

  /* Find the highest absolute value to calculate proper
     vector scale factor (so that it uses 12 bits) */
  temp1 = WebRtcSpl_MaxAbsValueW16(buf, (int16_t)lMem);
  temp2 = WebRtcSpl_MaxAbsValueW16(target, (int16_t)lTarget);

  if ((temp1>0)&&(temp2>0)) {
    temp1 = WEBRTC_SPL_MAX(temp1, temp2);
    scale = WebRtcSpl_GetSizeInBits(WEBRTC_SPL_MUL_16_16(temp1, temp1));
  } else {
    /* temp1 or temp2 is negative (maximum was -32768) */
    scale = 30;
  }

  /* Scale to so that a mul-add 40 times does not overflow */
  scale = scale - 25;
  scale = WEBRTC_SPL_MAX(0, scale);

  /* Compute energy of the original target */
  targetEner = WebRtcSpl_DotProductWithScale(target, target, lTarget, scale);

  /* Prepare search over one more codebook section. This section
     is created by filtering the original buffer with a filter. */
  WebRtcIlbcfix_FilteredCbVecs(cbvectors, buf, lMem, WebRtcIlbcfix_kFilterRange[block]);

  range = WebRtcIlbcfix_kSearchRange[block][0];

  if(lTarget == SUBL) {
    /* Create the interpolated samples and store them for use in all stages */

    /* First section, non-filtered half of the cb */
    WebRtcIlbcfix_InterpolateSamples(interpSamples, buf, lMem);

    /* Second section, filtered half of the cb */
    WebRtcIlbcfix_InterpolateSamples(interpSamplesFilt, cbvectors, lMem);

    /* Compute the CB vectors' energies for the first cb section (non-filtered) */
    WebRtcIlbcfix_CbMemEnergyAugmentation(interpSamples, buf,
                                          scale, 20, energyW16, energyShifts);

    /* Compute the CB vectors' energies for the second cb section (filtered cb) */
    WebRtcIlbcfix_CbMemEnergyAugmentation(interpSamplesFilt, cbvectors,
                                          scale, (int16_t)(base_size+20), energyW16, energyShifts);

    /* Compute the CB vectors' energies and store them in the vector
     * energyW16. Also the corresponding shift values are stored. The
     * energy values are used in all three stages. */
    WebRtcIlbcfix_CbMemEnergy(range, buf, cbvectors, lMem,
                              lTarget, energyW16+20, energyShifts+20, scale, base_size);

  } else {
    /* Compute the CB vectors' energies and store them in the vector
     * energyW16. Also the corresponding shift values are stored. The
     * energy values are used in all three stages. */
    WebRtcIlbcfix_CbMemEnergy(range, buf, cbvectors, lMem,
                              lTarget, energyW16, energyShifts, scale, base_size);

    /* Set the energy positions 58-63 and 122-127 to zero
       (otherwise they are uninitialized) */
    WebRtcSpl_MemSetW16(energyW16+range, 0, (base_size-range));
    WebRtcSpl_MemSetW16(energyW16+range+base_size, 0, (base_size-range));
  }

  /* Calculate Inverse Energy (energyW16 is already normalized
     and will contain the inverse energy in Q29 after this call */
  WebRtcIlbcfix_EnergyInverse(energyW16, base_size*CB_EXPAND);

  /* The gain value computed in the previous stage is used
   * as an upper limit to what the next stage gain value
   * is allowed to be. In stage 0, 16384 (1.0 in Q14) is used as
   * the upper limit. */
  gains[0] = 16384;

  for (stage=0; stage<CB_NSTAGES; stage++) {

    /* Set up memories */
    range = WebRtcIlbcfix_kSearchRange[block][stage];

    /* initialize search measures */
    CritMax=0;
    shTotMax=-100;
    bestIndex=0;
    bestGain=0;

    /* loop over lags 40+ in the first codebook section, full search */
    cb_vecPtr = buf+lMem-lTarget;

    /* Calculate all the cross correlations (augmented part of CB) */
    if (lTarget==SUBL) {
      WebRtcIlbcfix_AugmentedCbCorr(target, buf+lMem,
                                    interpSamples, cDot,
                                    20, 39, scale);
      cDotPtr=&cDot[20];
    } else {
      cDotPtr=cDot;
    }
    /* Calculate all the cross correlations (main part of CB) */
    WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, range, scale, -1);

    /* Adjust the search range for the augmented vectors */
    if (lTarget==SUBL) {
      range=WebRtcIlbcfix_kSearchRange[block][stage]+20;
    } else {
      range=WebRtcIlbcfix_kSearchRange[block][stage];
    }

    indexOffset=0;

    /* Search for best index in this part of the vector */
    WebRtcIlbcfix_CbSearchCore(
        cDot, range, stage, inverseEnergy,
        inverseEnergyShifts, Crit,
        &indexNew, &CritNew, &CritNewSh);

    /* Update the global best index and the corresponding gain */
    WebRtcIlbcfix_CbUpdateBestIndex(
        CritNew, CritNewSh, (int16_t)(indexNew+indexOffset), cDot[indexNew+indexOffset],
        inverseEnergy[indexNew+indexOffset], inverseEnergyShifts[indexNew+indexOffset],
        &CritMax, &shTotMax, &bestIndex, &bestGain);

    sInd=bestIndex-(int16_t)(CB_RESRANGE>>1);
    eInd=sInd+CB_RESRANGE;
    if (sInd<0) {
      eInd-=sInd;
      sInd=0;
    }
    if (eInd>=range) {
      eInd=range-1;
      sInd=eInd-CB_RESRANGE;
    }

    range = WebRtcIlbcfix_kSearchRange[block][stage];

    if (lTarget==SUBL) {
      i=sInd;
      if (sInd<20) {
        WebRtcIlbcfix_AugmentedCbCorr(target, cbvectors+lMem,
                                      interpSamplesFilt, cDot,
                                      (int16_t)(sInd+20), (int16_t)(WEBRTC_SPL_MIN(39, (eInd+20))), scale);
        i=20;
      }

      cDotPtr=&cDot[WEBRTC_SPL_MAX(0,(20-sInd))];
      cb_vecPtr = cbvectors+lMem-20-i;

      /* Calculate the cross correlations (main part of the filtered CB) */
      WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, (int16_t)(eInd-i+1), scale, -1);

    } else {
      cDotPtr = cDot;
      cb_vecPtr = cbvectors+lMem-lTarget-sInd;

      /* Calculate the cross correlations (main part of the filtered CB) */
      WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, (int16_t)(eInd-sInd+1), scale, -1);

    }

    /* Adjust the search range for the augmented vectors */
    indexOffset=base_size+sInd;

    /* Search for best index in this part of the vector */
    WebRtcIlbcfix_CbSearchCore(
        cDot, (int16_t)(eInd-sInd+1), stage, inverseEnergy+indexOffset,
        inverseEnergyShifts+indexOffset, Crit,
        &indexNew, &CritNew, &CritNewSh);

    /* Update the global best index and the corresponding gain */
    WebRtcIlbcfix_CbUpdateBestIndex(
        CritNew, CritNewSh, (int16_t)(indexNew+indexOffset), cDot[indexNew],
        inverseEnergy[indexNew+indexOffset], inverseEnergyShifts[indexNew+indexOffset],
        &CritMax, &shTotMax, &bestIndex, &bestGain);

    index[stage] = bestIndex;


    bestGain = WebRtcIlbcfix_GainQuant(bestGain,
                                       (int16_t)WEBRTC_SPL_ABS_W16(gains[stage]), stage, &gain_index[stage]);

    /* Extract the best (according to measure) codebook vector
       Also adjust the index, so that the augmented vectors are last.
       Above these vectors were first...
    */

    if(lTarget==(STATE_LEN-iLBCenc_inst->state_short_len)) {

      if(index[stage]<base_size) {
        pp=buf+lMem-lTarget-index[stage];
      } else {
        pp=cbvectors+lMem-lTarget-
            index[stage]+base_size;
      }

    } else {

      if (index[stage]<base_size) {
        if (index[stage]>=20) {
          /* Adjust index and extract vector */
          index[stage]-=20;
          pp=buf+lMem-lTarget-index[stage];
        } else {
          /* Adjust index and extract vector */
          index[stage]+=(base_size-20);

          WebRtcIlbcfix_CreateAugmentedVec((int16_t)(index[stage]-base_size+40),
                                           buf+lMem, aug_vec);
          pp = aug_vec;

        }
      } else {

        if ((index[stage] - base_size) >= 20) {
          /* Adjust index and extract vector */
          index[stage]-=20;
          pp=cbvectors+lMem-lTarget-
              index[stage]+base_size;
        } else {
          /* Adjust index and extract vector */
          index[stage]+=(base_size-20);
          WebRtcIlbcfix_CreateAugmentedVec((int16_t)(index[stage]-2*base_size+40),
                                           cbvectors+lMem, aug_vec);
          pp = aug_vec;
        }
      }
    }

    /* Subtract the best codebook vector, according
       to measure, from the target vector */

    WebRtcSpl_AddAffineVectorToVector(target, pp, (int16_t)(-bestGain), (int32_t)8192, (int16_t)14, (int)lTarget);

    /* record quantized gain */
    gains[stage+1] = bestGain;

  } /* end of Main Loop. for (stage=0;... */

  /* Calculte the coded vector (original target - what's left) */
  for (i=0;i<lTarget;i++) {
    codedVec[i]-=target[i];
  }

  /* Gain adjustment for energy matching */
  codedEner = WebRtcSpl_DotProductWithScale(codedVec, codedVec, lTarget, scale);

  j=gain_index[0];

  temp1 = (int16_t)WebRtcSpl_NormW32(codedEner);
  temp2 = (int16_t)WebRtcSpl_NormW32(targetEner);

  if(temp1 < temp2) {
    bits = 16 - temp1;
  } else {
    bits = 16 - temp2;
  }

  tmp = (int16_t) WEBRTC_SPL_MUL_16_16_RSFT(gains[1],gains[1], 14);

  targetEner = WEBRTC_SPL_MUL_16_16(
      WEBRTC_SPL_SHIFT_W32(targetEner, -bits), tmp);

  tmpW32 = ((int32_t)(gains[1]-1))<<1;

  /* Pointer to the table that contains
     gain_sq5TblFIX * gain_sq5TblFIX in Q14 */
  gainPtr=(int16_t*)WebRtcIlbcfix_kGainSq5Sq+gain_index[0];
  temp1 = (int16_t)WEBRTC_SPL_SHIFT_W32(codedEner, -bits);

  WebRtcIlbcfix_kGainSq5_ptr = (int16_t*)&WebRtcIlbcfix_kGainSq5[j];

  /* targetEner and codedEner are in Q(-2*scale) */
  for (i=gain_index[0];i<32;i++) {

    /* Change the index if
       (codedEnergy*gainTbl[i]*gainTbl[i])<(targetEn*gain[0]*gain[0]) AND
       gainTbl[i] < 2*gain[0]
    */

    t32 = WEBRTC_SPL_MUL_16_16(temp1, (*gainPtr));
    t32 = t32 - targetEner;
    if (t32 < 0) {
      if ((*WebRtcIlbcfix_kGainSq5_ptr) < tmpW32) {
        j=i;
        WebRtcIlbcfix_kGainSq5_ptr = (int16_t*)&WebRtcIlbcfix_kGainSq5[i];
      }
    }
    gainPtr++;
  }
  gain_index[0]=j;

  return;
}
Example #6
0
int WebRtcSpl_ComplexIFFT(WebRtc_Word16 frfi[], int stages, int mode)
{
    int i, j, l, k, istep, n, m, scale, shift;
    WebRtc_Word16 wr, wi;
    WebRtc_Word32 tr32, ti32, qr32, qi32;
    WebRtc_Word32 tmp32, round2;

    /* The 1024-value is a constant given from the size of WebRtcSpl_kSinTable1024[],
     * and should not be changed depending on the input parameter 'stages'
     */
    n = 1 << stages;
    if (n > 1024)
        return -1;

    scale = 0;

    l = 1;
    k = 10 - 1; /* Constant for given WebRtcSpl_kSinTable1024[]. Do not change
         depending on the input parameter 'stages' */

    while (l < n)
    {
        // variable scaling, depending upon data
        shift = 0;
        round2 = 8192;

        tmp32 = (WebRtc_Word32)WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
        if (tmp32 > 13573)
        {
            shift++;
            scale++;
            round2 <<= 1;
        }
        if (tmp32 > 27146)
        {
            shift++;
            scale++;
            round2 <<= 1;
        }

        istep = l << 1;

        if (mode == 0)
        {
            // mode==0: Low-complexity and Low-accuracy mode
            for (m = 0; m < l; ++m)
            {
                j = m << k;

                /* The 256-value is a constant given as 1/4 of the size of
                 * WebRtcSpl_kSinTable1024[], and should not be changed depending on the input
                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
                 */
                wr = WebRtcSpl_kSinTable1024[j + 256];
                wi = WebRtcSpl_kSinTable1024[j];

                for (i = m; i < n; i += istep)
                {
                    j = i + l;

                    tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j], 0)
                            - WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j + 1], 0)), 15);

                    ti32 = WEBRTC_SPL_RSHIFT_W32(
                            (WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j + 1], 0)
                                    + WEBRTC_SPL_MUL_16_16_RSFT(wi,frfi[2*j],0)), 15);

                    qr32 = (WebRtc_Word32)frfi[2 * i];
                    qi32 = (WebRtc_Word32)frfi[2 * i + 1];
                    frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 - tr32, shift);
                    frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 - ti32, shift);
                    frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 + tr32, shift);
                    frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 + ti32, shift);
                }
            }
        } else
        {
            // mode==1: High-complexity and High-accuracy mode

            for (m = 0; m < l; ++m)
            {
                j = m << k;

                /* The 256-value is a constant given as 1/4 of the size of
                 * WebRtcSpl_kSinTable1024[], and should not be changed depending on the input
                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
                 */
                wr = WebRtcSpl_kSinTable1024[j + 256];
                wi = WebRtcSpl_kSinTable1024[j];

                for (i = m; i < n; i += istep)
                {
                    j = i + l;

                    tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j], 0)
                            - WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j + 1], 0) + CIFFTRND),
                            15 - CIFFTSFT);

                    ti32 = WEBRTC_SPL_RSHIFT_W32(
                                    (WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j + 1], 0)
                                            + WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j], 0)
                                            + CIFFTRND), 15 - CIFFTSFT);

                    qr32 = ((WebRtc_Word32)frfi[2 * i]) << CIFFTSFT;
                    qi32 = ((WebRtc_Word32)frfi[2 * i + 1]) << CIFFTSFT;
                    frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32((qr32 - tr32+round2),
                                                                       shift+CIFFTSFT);
                    frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
                            (qi32 - ti32 + round2), shift + CIFFTSFT);
                    frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32((qr32 + tr32 + round2),
                                                                       shift + CIFFTSFT);
                    frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
                            (qi32 + ti32 + round2), shift + CIFFTSFT);
                }
            }

        }
        --k;
        l = istep;
    }
    return scale;
}