/src/flac/src/libFLAC/lpc.c

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/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2000-2009  Josh Coalson
 * Copyright (C) 2011-2023  Xiph.Org Foundation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Xiph.org Foundation nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <math.h>
#include <stdlib.h>

#include "FLAC/assert.h"
#include "FLAC/format.h"
#include "share/compat.h"
#include "private/bitmath.h"
#include "private/lpc.h"
#include "private/macros.h"

#if !defined(NDEBUG) || defined FLAC__OVERFLOW_DETECT || defined FLAC__OVERFLOW_DETECT_VERBOSE
#include <stdio.h>
#endif

/* OPT: #undef'ing this may improve the speed on some architectures */
#define FLAC__LPC_UNROLLED_FILTER_LOOPS

#ifndef FLAC__INTEGER_ONLY_LIBRARY

#if defined(_MSC_VER) && (_MSC_VER < 1800)
#include <float.h>
static inline long int lround(double x) {
  return (long)(x + _copysign(0.5, x));
}
#elif !defined(HAVE_LROUND) && defined(__GNUC__)
static inline long int lround(double x) {
  return (long)(x + __builtin_copysign(0.5, x));
}
/* If this fails, we are in the presence of a mid 90's compiler, move along... */
#endif

void FLAC__lpc_window_data(const FLAC__int32 in[], const FLAC__real window[], FLAC__real out[], uint32_t data_len)
{
  uint32_t i;
  for(i = 0; i < data_len; i++)
    out[i] = in[i] * window[i];
}

void FLAC__lpc_window_data_wide(const FLAC__int64 in[], const FLAC__real window[], FLAC__real out[], uint32_t data_len)
{
  uint32_t i;
  for(i = 0; i < data_len; i++)
    out[i] = in[i] * window[i];
}

void FLAC__lpc_window_data_partial(const FLAC__int32 in[], const FLAC__real window[], FLAC__real out[], uint32_t data_len, uint32_t part_size, uint32_t data_shift)
{
  uint32_t i, j;
  if((part_size + data_shift) < data_len){
    for(i = 0; i < part_size; i++)
      out[i] = in[data_shift+i] * window[i];
    i = flac_min(i,data_len - part_size - data_shift);
    for(j = data_len - part_size; j < data_len; i++, j++)
      out[i] = in[data_shift+i] * window[j];
    if(i < data_len)
      out[i] = 0.0f;
  }
}

void FLAC__lpc_window_data_partial_wide(const FLAC__int64 in[], const FLAC__real window[], FLAC__real out[], uint32_t data_len, uint32_t part_size, uint32_t data_shift)
{
  uint32_t i, j;
  if((part_size + data_shift) < data_len){
    for(i = 0; i < part_size; i++)
      out[i] = in[data_shift+i] * window[i];
    i = flac_min(i,data_len - part_size - data_shift);
    for(j = data_len - part_size; j < data_len; i++, j++)
      out[i] = in[data_shift+i] * window[j];
    if(i < data_len)
      out[i] = 0.0f;
  }
}

void FLAC__lpc_compute_autocorrelation(const FLAC__real data[], uint32_t data_len, uint32_t lag, double autoc[])
{
  /* a readable, but slower, version */
#if 0
  double d;
  uint32_t i;

  FLAC__ASSERT(lag > 0);
  FLAC__ASSERT(lag <= data_len);

  /*
   * Technically we should subtract the mean first like so:
   *   for(i = 0; i < data_len; i++)
   *     data[i] -= mean;
   * but it appears not to make enough of a difference to matter, and
   * most signals are already closely centered around zero
   */
  while(lag--) {
    for(i = lag, d = 0.0; i < data_len; i++)
      d += data[i] * (double)data[i - lag];
    autoc[lag] = d;
  }
#endif
  if (data_len < FLAC__MAX_LPC_ORDER || lag > 16) {
    /*
     * this version tends to run faster because of better data locality
     * ('data_len' is usually much larger than 'lag')
     */
    double d;
    uint32_t sample, coeff;
    const uint32_t limit = data_len - lag;

    FLAC__ASSERT(lag > 0);
    FLAC__ASSERT(lag <= data_len);

    for(coeff = 0; coeff < lag; coeff++)
      autoc[coeff] = 0.0;
    for(sample = 0; sample <= limit; sample++) {
      d = data[sample];
      for(coeff = 0; coeff < lag; coeff++)
        autoc[coeff] += d * data[sample+coeff];
    }
    for(; sample < data_len; sample++) {
      d = data[sample];
      for(coeff = 0; coeff < data_len - sample; coeff++)
        autoc[coeff] += d * data[sample+coeff];
    }
  }
  else if(lag <= 8) {
    #undef MAX_LAG
    #define MAX_LAG 8
    #include "deduplication/lpc_compute_autocorrelation_intrin.c"
  }
  else if(lag <= 12) {
    #undef MAX_LAG
    #define MAX_LAG 12
    #include "deduplication/lpc_compute_autocorrelation_intrin.c"
  }
  else if(lag <= 16) {
    #undef MAX_LAG
    #define MAX_LAG 16
    #include "deduplication/lpc_compute_autocorrelation_intrin.c"
  }

}

void FLAC__lpc_compute_lp_coefficients(const double autoc[], uint32_t *max_order, FLAC__real lp_coeff[][FLAC__MAX_LPC_ORDER], double error[])
{
  uint32_t i, j;
  double r, err, lpc[FLAC__MAX_LPC_ORDER];

  FLAC__ASSERT(0 != max_order);
  FLAC__ASSERT(0 < *max_order);
  FLAC__ASSERT(*max_order <= FLAC__MAX_LPC_ORDER);
  FLAC__ASSERT(autoc[0] != 0.0);

  err = autoc[0];

  for(i = 0; i < *max_order; i++) {
    /* Sum up this iteration's reflection coefficient. */
    r = -autoc[i+1];
    for(j = 0; j < i; j++)
      r -= lpc[j] * autoc[i-j];
    r /= err;

    /* Update LPC coefficients and total error. */
    lpc[i]=r;
    for(j = 0; j < (i>>1); j++) {
      double tmp = lpc[j];
      lpc[j] += r * lpc[i-1-j];
      lpc[i-1-j] += r * tmp;
    }
    if(i & 1)
      lpc[j] += lpc[j] * r;

    err *= (1.0 - r * r);

    /* save this order */
    for(j = 0; j <= i; j++)
      lp_coeff[i][j] = (FLAC__real)(-lpc[j]); /* negate FIR filter coeff to get predictor coeff */
    error[i] = err;

    /* see SF bug https://sourceforge.net/p/flac/bugs/234/ */
    if(err == 0.0) {
      *max_order = i+1;
      return;
    }
  }
}

int FLAC__lpc_quantize_coefficients(const FLAC__real lp_coeff[], uint32_t order, uint32_t precision, FLAC__int32 qlp_coeff[], int *shift)
{
  uint32_t i;
  double cmax;
  FLAC__int32 qmax, qmin;

  FLAC__ASSERT(precision > 0);
  FLAC__ASSERT(precision >= FLAC__MIN_QLP_COEFF_PRECISION);

  /* drop one bit for the sign; from here on out we consider only |lp_coeff[i]| */
  precision--;
  qmax = 1 << precision;
  qmin = -qmax;
  qmax--;

  /* calc cmax = max( |lp_coeff[i]| ) */
  cmax = 0.0;
  for(i = 0; i < order; i++) {
    const double d = fabs(lp_coeff[i]);
    if(d > cmax)
      cmax = d;
  }

  if(cmax <= 0.0) {
    /* => coefficients are all 0, which means our constant-detect didn't work */
    return 2;
  }
  else {
    const int max_shiftlimit = (1 << (FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN-1)) - 1;
    const int min_shiftlimit = -max_shiftlimit - 1;
    int log2cmax;

    (void)frexp(cmax, &log2cmax);
    log2cmax--;
    *shift = (int)precision - log2cmax - 1;

    if(*shift > max_shiftlimit)
      *shift = max_shiftlimit;
    else if(*shift < min_shiftlimit)
      return 1;
  }

  if(*shift >= 0) {
    double error = 0.0;
    FLAC__int32 q;
    for(i = 0; i < order; i++) {
      error += lp_coeff[i] * (1 << *shift);
      q = lround(error);

#ifdef FLAC__OVERFLOW_DETECT
      if(q > qmax+1) /* we expect q==qmax+1 occasionally due to rounding */
        fprintf(stderr,"FLAC__lpc_quantize_coefficients: quantizer overflow: q>qmax %d>%d shift=%d cmax=%f precision=%u lpc[%u]=%f\n",q,qmax,*shift,cmax,precision+1,i,lp_coeff[i]);
      else if(q < qmin)
        fprintf(stderr,"FLAC__lpc_quantize_coefficients: quantizer overflow: q<qmin %d<%d shift=%d cmax=%f precision=%u lpc[%u]=%f\n",q,qmin,*shift,cmax,precision+1,i,lp_coeff[i]);
#endif
      if(q > qmax)
        q = qmax;
      else if(q < qmin)
        q = qmin;
      error -= q;
      qlp_coeff[i] = q;
    }
  }
  /* negative shift is very rare but due to design flaw, negative shift is
   * not allowed in the decoder, so it must be handled specially by scaling
   * down coeffs
   */
  else {
    const int nshift = -(*shift);
    double error = 0.0;
    FLAC__int32 q;
#ifndef NDEBUG
    fprintf(stderr,"FLAC__lpc_quantize_coefficients: negative shift=%d order=%u cmax=%f\n", *shift, order, cmax);
#endif
    for(i = 0; i < order; i++) {
      error += lp_coeff[i] / (1 << nshift);
      q = lround(error);
#ifdef FLAC__OVERFLOW_DETECT
      if(q > qmax+1) /* we expect q==qmax+1 occasionally due to rounding */
        fprintf(stderr,"FLAC__lpc_quantize_coefficients: quantizer overflow: q>qmax %d>%d shift=%d cmax=%f precision=%u lpc[%u]=%f\n",q,qmax,*shift,cmax,precision+1,i,lp_coeff[i]);
      else if(q < qmin)
        fprintf(stderr,"FLAC__lpc_quantize_coefficients: quantizer overflow: q<qmin %d<%d shift=%d cmax=%f precision=%u lpc[%u]=%f\n",q,qmin,*shift,cmax,precision+1,i,lp_coeff[i]);
#endif
      if(q > qmax)
        q = qmax;
      else if(q < qmin)
        q = qmin;
      error -= q;
      qlp_coeff[i] = q;
    }
    *shift = 0;
  }

  return 0;
}

#if defined(_MSC_VER)
// silence MSVC warnings about __restrict modifier
#pragma warning ( disable : 4028 )
#endif

void FLAC__lpc_compute_residual_from_qlp_coefficients(const FLAC__int32 * flac_restrict data, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int32 * flac_restrict residual)
#if defined(FLAC__OVERFLOW_DETECT) || !defined(FLAC__LPC_UNROLLED_FILTER_LOOPS)
{
  FLAC__int64 sumo;
  uint32_t i, j;
  FLAC__int32 sum;
  const FLAC__int32 *history;

#ifdef FLAC__OVERFLOW_DETECT_VERBOSE
  fprintf(stderr,"FLAC__lpc_compute_residual_from_qlp_coefficients: data_len=%d, order=%u, lpq=%d",data_len,order,lp_quantization);
  for(i=0;i<order;i++)
    fprintf(stderr,", q[%u]=%d",i,qlp_coeff[i]);
  fprintf(stderr,"\n");
#endif
  FLAC__ASSERT(order > 0);

  for(i = 0; i < data_len; i++) {
    sumo = 0;
    sum = 0;
    history = data;
    for(j = 0; j < order; j++) {
      sum += qlp_coeff[j] * (*(--history));
      sumo += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*history);
      if(sumo > 2147483647ll || sumo < -2147483648ll)
        fprintf(stderr,"FLAC__lpc_compute_residual_from_qlp_coefficients: OVERFLOW, i=%u, j=%u, c=%d, d=%d, sumo=%" PRId64 "\n",i,j,qlp_coeff[j],*history,sumo);
    }
    *(residual++) = *(data++) - (sum >> lp_quantization);
  }

  /* Here's a slower but clearer version:
  for(i = 0; i < data_len; i++) {
    sum = 0;
    for(j = 0; j < order; j++)
      sum += qlp_coeff[j] * data[i-j-1];
    residual[i] = data[i] - (sum >> lp_quantization);
  }
  */
}
#else /* fully unrolled version for normal use */
{
  int i;
  FLAC__int32 sum;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  /*
   * We do unique versions up to 12th order since that's the subset limit.
   * Also they are roughly ordered to match frequency of occurrence to
   * minimize branching.
   */
  if(order <= 12) {
    if(order > 8) {
      if(order > 10) {
        if(order == 12) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[11] * data[i-12];
            sum += qlp_coeff[10] * data[i-11];
            sum += qlp_coeff[9] * data[i-10];
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 11 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[10] * data[i-11];
            sum += qlp_coeff[9] * data[i-10];
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 10) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[9] * data[i-10];
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 9 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
    }
    else if(order > 4) {
      if(order > 6) {
        if(order == 8) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 7 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 6) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 5 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
    }
    else {
      if(order > 2) {
        if(order == 4) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 3 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 2) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 1 */
          for(i = 0; i < (int)data_len; i++)
            residual[i] = data[i] - ((qlp_coeff[0] * data[i-1]) >> lp_quantization);
        }
      }
    }
  }
  else { /* order > 12 */
    for(i = 0; i < (int)data_len; i++) {
      sum = 0;
      switch(order) {
        case 32: sum += qlp_coeff[31] * data[i-32]; /* Falls through. */
        case 31: sum += qlp_coeff[30] * data[i-31]; /* Falls through. */
        case 30: sum += qlp_coeff[29] * data[i-30]; /* Falls through. */
        case 29: sum += qlp_coeff[28] * data[i-29]; /* Falls through. */
        case 28: sum += qlp_coeff[27] * data[i-28]; /* Falls through. */
        case 27: sum += qlp_coeff[26] * data[i-27]; /* Falls through. */
        case 26: sum += qlp_coeff[25] * data[i-26]; /* Falls through. */
        case 25: sum += qlp_coeff[24] * data[i-25]; /* Falls through. */
        case 24: sum += qlp_coeff[23] * data[i-24]; /* Falls through. */
        case 23: sum += qlp_coeff[22] * data[i-23]; /* Falls through. */
        case 22: sum += qlp_coeff[21] * data[i-22]; /* Falls through. */
        case 21: sum += qlp_coeff[20] * data[i-21]; /* Falls through. */
        case 20: sum += qlp_coeff[19] * data[i-20]; /* Falls through. */
        case 19: sum += qlp_coeff[18] * data[i-19]; /* Falls through. */
        case 18: sum += qlp_coeff[17] * data[i-18]; /* Falls through. */
        case 17: sum += qlp_coeff[16] * data[i-17]; /* Falls through. */
        case 16: sum += qlp_coeff[15] * data[i-16]; /* Falls through. */
        case 15: sum += qlp_coeff[14] * data[i-15]; /* Falls through. */
        case 14: sum += qlp_coeff[13] * data[i-14]; /* Falls through. */
        case 13: sum += qlp_coeff[12] * data[i-13];
                 sum += qlp_coeff[11] * data[i-12];
                 sum += qlp_coeff[10] * data[i-11];
                 sum += qlp_coeff[ 9] * data[i-10];
                 sum += qlp_coeff[ 8] * data[i- 9];
                 sum += qlp_coeff[ 7] * data[i- 8];
                 sum += qlp_coeff[ 6] * data[i- 7];
                 sum += qlp_coeff[ 5] * data[i- 6];
                 sum += qlp_coeff[ 4] * data[i- 5];
                 sum += qlp_coeff[ 3] * data[i- 4];
                 sum += qlp_coeff[ 2] * data[i- 3];
                 sum += qlp_coeff[ 1] * data[i- 2];
                 sum += qlp_coeff[ 0] * data[i- 1];
      }
      residual[i] = data[i] - (sum >> lp_quantization);
    }
  }
}
#endif

void FLAC__lpc_compute_residual_from_qlp_coefficients_wide(const FLAC__int32 * flac_restrict data, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int32 * flac_restrict residual)
#if defined(FLAC__OVERFLOW_DETECT) || !defined(FLAC__LPC_UNROLLED_FILTER_LOOPS)
{
  uint32_t i, j;
  FLAC__int64 sum;
  const FLAC__int32 *history;

#ifdef FLAC__OVERFLOW_DETECT_VERBOSE
  fprintf(stderr,"FLAC__lpc_compute_residual_from_qlp_coefficients_wide: data_len=%d, order=%u, lpq=%d",data_len,order,lp_quantization);
  for(i=0;i<order;i++)
    fprintf(stderr,", q[%u]=%d",i,qlp_coeff[i]);
  fprintf(stderr,"\n");
#endif
  FLAC__ASSERT(order > 0);

  for(i = 0; i < data_len; i++) {
    sum = 0;
    history = data;
    for(j = 0; j < order; j++)
      sum += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*(--history));
    if(FLAC__bitmath_silog2((FLAC__int64)(*data) - (sum >> lp_quantization)) > 32) {
      fprintf(stderr,"FLAC__lpc_compute_residual_from_qlp_coefficients_wide: OVERFLOW, i=%u, data=%d, sum=%" PRId64 ", residual=%" PRId64 "\n", i, *data, (int64_t)(sum >> lp_quantization), ((FLAC__int64)(*data) - (sum >> lp_quantization)));
      break;
    }
    *(residual++) = *(data++) - (FLAC__int32)(sum >> lp_quantization);
  }
}
#else /* fully unrolled version for normal use */
{
  int i;
  FLAC__int64 sum;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  /*
   * We do unique versions up to 12th order since that's the subset limit.
   * Also they are roughly ordered to match frequency of occurrence to
   * minimize branching.
   */
  if(order <= 12) {
    if(order > 8) {
      if(order > 10) {
        if(order == 12) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[11] * (FLAC__int64)data[i-12];
            sum += qlp_coeff[10] * (FLAC__int64)data[i-11];
            sum += qlp_coeff[9] * (FLAC__int64)data[i-10];
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 11 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[10] * (FLAC__int64)data[i-11];
            sum += qlp_coeff[9] * (FLAC__int64)data[i-10];
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 10) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[9] * (FLAC__int64)data[i-10];
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 9 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
    }
    else if(order > 4) {
      if(order > 6) {
        if(order == 8) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 7 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 6) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 5 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
    }
    else {
      if(order > 2) {
        if(order == 4) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 3 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 2) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            residual[i] = data[i] - (sum >> lp_quantization);
          }
        }
        else { /* order == 1 */
          for(i = 0; i < (int)data_len; i++)
            residual[i] = data[i] - ((qlp_coeff[0] * (FLAC__int64)data[i-1]) >> lp_quantization);
        }
      }
    }
  }
  else { /* order > 12 */
    for(i = 0; i < (int)data_len; i++) {
      sum = 0;
      switch(order) {
        case 32: sum += qlp_coeff[31] * (FLAC__int64)data[i-32]; /* Falls through. */
        case 31: sum += qlp_coeff[30] * (FLAC__int64)data[i-31]; /* Falls through. */
        case 30: sum += qlp_coeff[29] * (FLAC__int64)data[i-30]; /* Falls through. */
        case 29: sum += qlp_coeff[28] * (FLAC__int64)data[i-29]; /* Falls through. */
        case 28: sum += qlp_coeff[27] * (FLAC__int64)data[i-28]; /* Falls through. */
        case 27: sum += qlp_coeff[26] * (FLAC__int64)data[i-27]; /* Falls through. */
        case 26: sum += qlp_coeff[25] * (FLAC__int64)data[i-26]; /* Falls through. */
        case 25: sum += qlp_coeff[24] * (FLAC__int64)data[i-25]; /* Falls through. */
        case 24: sum += qlp_coeff[23] * (FLAC__int64)data[i-24]; /* Falls through. */
        case 23: sum += qlp_coeff[22] * (FLAC__int64)data[i-23]; /* Falls through. */
        case 22: sum += qlp_coeff[21] * (FLAC__int64)data[i-22]; /* Falls through. */
        case 21: sum += qlp_coeff[20] * (FLAC__int64)data[i-21]; /* Falls through. */
        case 20: sum += qlp_coeff[19] * (FLAC__int64)data[i-20]; /* Falls through. */
        case 19: sum += qlp_coeff[18] * (FLAC__int64)data[i-19]; /* Falls through. */
        case 18: sum += qlp_coeff[17] * (FLAC__int64)data[i-18]; /* Falls through. */
        case 17: sum += qlp_coeff[16] * (FLAC__int64)data[i-17]; /* Falls through. */
        case 16: sum += qlp_coeff[15] * (FLAC__int64)data[i-16]; /* Falls through. */
        case 15: sum += qlp_coeff[14] * (FLAC__int64)data[i-15]; /* Falls through. */
        case 14: sum += qlp_coeff[13] * (FLAC__int64)data[i-14]; /* Falls through. */
        case 13: sum += qlp_coeff[12] * (FLAC__int64)data[i-13];
                 sum += qlp_coeff[11] * (FLAC__int64)data[i-12];
                 sum += qlp_coeff[10] * (FLAC__int64)data[i-11];
                 sum += qlp_coeff[ 9] * (FLAC__int64)data[i-10];
                 sum += qlp_coeff[ 8] * (FLAC__int64)data[i- 9];
                 sum += qlp_coeff[ 7] * (FLAC__int64)data[i- 8];
                 sum += qlp_coeff[ 6] * (FLAC__int64)data[i- 7];
                 sum += qlp_coeff[ 5] * (FLAC__int64)data[i- 6];
                 sum += qlp_coeff[ 4] * (FLAC__int64)data[i- 5];
                 sum += qlp_coeff[ 3] * (FLAC__int64)data[i- 4];
                 sum += qlp_coeff[ 2] * (FLAC__int64)data[i- 3];
                 sum += qlp_coeff[ 1] * (FLAC__int64)data[i- 2];
                 sum += qlp_coeff[ 0] * (FLAC__int64)data[i- 1];
      }
      residual[i] = data[i] - (sum >> lp_quantization);
    }
  }
}
#endif

FLAC__bool FLAC__lpc_compute_residual_from_qlp_coefficients_limit_residual(const FLAC__int32 * flac_restrict data, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int32 * flac_restrict residual)
{
  int i;
  FLAC__int64 sum, residual_to_check;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  for(i = 0; i < (int)data_len; i++) {
    sum = 0;
    switch(order) {
      case 32: sum += qlp_coeff[31] * (FLAC__int64)data[i-32]; /* Falls through. */
      case 31: sum += qlp_coeff[30] * (FLAC__int64)data[i-31]; /* Falls through. */
      case 30: sum += qlp_coeff[29] * (FLAC__int64)data[i-30]; /* Falls through. */
      case 29: sum += qlp_coeff[28] * (FLAC__int64)data[i-29]; /* Falls through. */
      case 28: sum += qlp_coeff[27] * (FLAC__int64)data[i-28]; /* Falls through. */
      case 27: sum += qlp_coeff[26] * (FLAC__int64)data[i-27]; /* Falls through. */
      case 26: sum += qlp_coeff[25] * (FLAC__int64)data[i-26]; /* Falls through. */
      case 25: sum += qlp_coeff[24] * (FLAC__int64)data[i-25]; /* Falls through. */
      case 24: sum += qlp_coeff[23] * (FLAC__int64)data[i-24]; /* Falls through. */
      case 23: sum += qlp_coeff[22] * (FLAC__int64)data[i-23]; /* Falls through. */
      case 22: sum += qlp_coeff[21] * (FLAC__int64)data[i-22]; /* Falls through. */
      case 21: sum += qlp_coeff[20] * (FLAC__int64)data[i-21]; /* Falls through. */
      case 20: sum += qlp_coeff[19] * (FLAC__int64)data[i-20]; /* Falls through. */
      case 19: sum += qlp_coeff[18] * (FLAC__int64)data[i-19]; /* Falls through. */
      case 18: sum += qlp_coeff[17] * (FLAC__int64)data[i-18]; /* Falls through. */
      case 17: sum += qlp_coeff[16] * (FLAC__int64)data[i-17]; /* Falls through. */
      case 16: sum += qlp_coeff[15] * (FLAC__int64)data[i-16]; /* Falls through. */
      case 15: sum += qlp_coeff[14] * (FLAC__int64)data[i-15]; /* Falls through. */
      case 14: sum += qlp_coeff[13] * (FLAC__int64)data[i-14]; /* Falls through. */
      case 13: sum += qlp_coeff[12] * (FLAC__int64)data[i-13]; /* Falls through. */
      case 12: sum += qlp_coeff[11] * (FLAC__int64)data[i-12]; /* Falls through. */
      case 11: sum += qlp_coeff[10] * (FLAC__int64)data[i-11]; /* Falls through. */
      case 10: sum += qlp_coeff[ 9] * (FLAC__int64)data[i-10]; /* Falls through. */
      case  9: sum += qlp_coeff[ 8] * (FLAC__int64)data[i- 9]; /* Falls through. */
      case  8: sum += qlp_coeff[ 7] * (FLAC__int64)data[i- 8]; /* Falls through. */
      case  7: sum += qlp_coeff[ 6] * (FLAC__int64)data[i- 7]; /* Falls through. */
      case  6: sum += qlp_coeff[ 5] * (FLAC__int64)data[i- 6]; /* Falls through. */
      case  5: sum += qlp_coeff[ 4] * (FLAC__int64)data[i- 5]; /* Falls through. */
      case  4: sum += qlp_coeff[ 3] * (FLAC__int64)data[i- 4]; /* Falls through. */
      case  3: sum += qlp_coeff[ 2] * (FLAC__int64)data[i- 3]; /* Falls through. */
      case  2: sum += qlp_coeff[ 1] * (FLAC__int64)data[i- 2]; /* Falls through. */
      case  1: sum += qlp_coeff[ 0] * (FLAC__int64)data[i- 1];
    }
    residual_to_check = data[i] - (sum >> lp_quantization);
     /* residual must not be INT32_MIN because abs(INT32_MIN) is undefined */
    if(residual_to_check <= INT32_MIN || residual_to_check > INT32_MAX)
      return false;
    else
      residual[i] = residual_to_check;
  }
  return true;
}

FLAC__bool FLAC__lpc_compute_residual_from_qlp_coefficients_limit_residual_33bit(const FLAC__int64 * flac_restrict data, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int32 * flac_restrict residual)
{
  int i;
  FLAC__int64 sum, residual_to_check;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  for(i = 0; i < (int)data_len; i++) {
    sum = 0;
    switch(order) {
      case 32: sum += qlp_coeff[31] * data[i-32]; /* Falls through. */
      case 31: sum += qlp_coeff[30] * data[i-31]; /* Falls through. */
      case 30: sum += qlp_coeff[29] * data[i-30]; /* Falls through. */
      case 29: sum += qlp_coeff[28] * data[i-29]; /* Falls through. */
      case 28: sum += qlp_coeff[27] * data[i-28]; /* Falls through. */
      case 27: sum += qlp_coeff[26] * data[i-27]; /* Falls through. */
      case 26: sum += qlp_coeff[25] * data[i-26]; /* Falls through. */
      case 25: sum += qlp_coeff[24] * data[i-25]; /* Falls through. */
      case 24: sum += qlp_coeff[23] * data[i-24]; /* Falls through. */
      case 23: sum += qlp_coeff[22] * data[i-23]; /* Falls through. */
      case 22: sum += qlp_coeff[21] * data[i-22]; /* Falls through. */
      case 21: sum += qlp_coeff[20] * data[i-21]; /* Falls through. */
      case 20: sum += qlp_coeff[19] * data[i-20]; /* Falls through. */
      case 19: sum += qlp_coeff[18] * data[i-19]; /* Falls through. */
      case 18: sum += qlp_coeff[17] * data[i-18]; /* Falls through. */
      case 17: sum += qlp_coeff[16] * data[i-17]; /* Falls through. */
      case 16: sum += qlp_coeff[15] * data[i-16]; /* Falls through. */
      case 15: sum += qlp_coeff[14] * data[i-15]; /* Falls through. */
      case 14: sum += qlp_coeff[13] * data[i-14]; /* Falls through. */
      case 13: sum += qlp_coeff[12] * data[i-13]; /* Falls through. */
      case 12: sum += qlp_coeff[11] * data[i-12]; /* Falls through. */
      case 11: sum += qlp_coeff[10] * data[i-11]; /* Falls through. */
      case 10: sum += qlp_coeff[ 9] * data[i-10]; /* Falls through. */
      case  9: sum += qlp_coeff[ 8] * data[i- 9]; /* Falls through. */
      case  8: sum += qlp_coeff[ 7] * data[i- 8]; /* Falls through. */
      case  7: sum += qlp_coeff[ 6] * data[i- 7]; /* Falls through. */
      case  6: sum += qlp_coeff[ 5] * data[i- 6]; /* Falls through. */
      case  5: sum += qlp_coeff[ 4] * data[i- 5]; /* Falls through. */
      case  4: sum += qlp_coeff[ 3] * data[i- 4]; /* Falls through. */
      case  3: sum += qlp_coeff[ 2] * data[i- 3]; /* Falls through. */
      case  2: sum += qlp_coeff[ 1] * data[i- 2]; /* Falls through. */
      case  1: sum += qlp_coeff[ 0] * data[i- 1];
    }
    residual_to_check = data[i] - (sum >> lp_quantization);
    /* residual must not be INT32_MIN because abs(INT32_MIN) is undefined */
    if(residual_to_check <= INT32_MIN || residual_to_check > INT32_MAX)
      return false;
    else
      residual[i] = residual_to_check;
  }
  return true;
}

#endif /* !defined FLAC__INTEGER_ONLY_LIBRARY */

uint32_t FLAC__lpc_max_prediction_before_shift_bps(uint32_t subframe_bps, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order)
{
  /* This used to be subframe_bps + qlp_coeff_precision + FLAC__bitmath_ilog2(order)
   * but that treats both the samples as well as the predictor as unknown. The
   * predictor is known however, so taking the log2 of the sum of the absolute values
   * of all coefficients is a more accurate representation of the predictor */
  FLAC__int32 abs_sum_of_qlp_coeff = 0;
  uint32_t i;
  for(i = 0; i < order; i++)
    abs_sum_of_qlp_coeff += abs(qlp_coeff[i]);
  if(abs_sum_of_qlp_coeff == 0)
    abs_sum_of_qlp_coeff = 1;
  return subframe_bps + FLAC__bitmath_silog2(abs_sum_of_qlp_coeff);
}


uint32_t FLAC__lpc_max_residual_bps(uint32_t subframe_bps, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization)
{
  FLAC__int32 predictor_sum_bps = FLAC__lpc_max_prediction_before_shift_bps(subframe_bps, qlp_coeff, order) - lp_quantization;
  if((int)subframe_bps > predictor_sum_bps)
    return subframe_bps + 1;
  else
    return predictor_sum_bps + 1;
}

#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && !defined(FUZZING_BUILD_MODE_FLAC_SANITIZE_SIGNED_INTEGER_OVERFLOW)
/* The attribute below is to silence the undefined sanitizer of oss-fuzz.
 * Because fuzzing feeds bogus predictors and residual samples to the
 * decoder, having overflows in this section is unavoidable. Also,
 * because the calculated values are audio path only, there is no
 * potential for security problems */
__attribute__((no_sanitize("signed-integer-overflow")))
#endif
void FLAC__lpc_restore_signal(const FLAC__int32 * flac_restrict residual, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int32 * flac_restrict data)
#if defined(FLAC__OVERFLOW_DETECT) || !defined(FLAC__LPC_UNROLLED_FILTER_LOOPS)
{
  FLAC__int64 sumo;
  uint32_t i, j;
  FLAC__int32 sum;
  const FLAC__int32 *r = residual, *history;

#ifdef FLAC__OVERFLOW_DETECT_VERBOSE
  fprintf(stderr,"FLAC__lpc_restore_signal: data_len=%d, order=%u, lpq=%d",data_len,order,lp_quantization);
  for(i=0;i<order;i++)
    fprintf(stderr,", q[%u]=%d",i,qlp_coeff[i]);
  fprintf(stderr,"\n");
#endif
  FLAC__ASSERT(order > 0);

  for(i = 0; i < data_len; i++) {
    sumo = 0;
    sum = 0;
    history = data;
    for(j = 0; j < order; j++) {
      sum += qlp_coeff[j] * (*(--history));
      sumo += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*history);
#ifdef FLAC__OVERFLOW_DETECT
      if(sumo > 2147483647ll || sumo < -2147483648ll)
        fprintf(stderr,"FLAC__lpc_restore_signal: OVERFLOW, i=%u, j=%u, c=%d, d=%d, sumo=%" PRId64 "\n",i,j,qlp_coeff[j],*history,sumo);
#endif
    }
    *(data++) = *(r++) + (sum >> lp_quantization);
  }

  /* Here's a slower but clearer version:
  for(i = 0; i < data_len; i++) {
    sum = 0;
    for(j = 0; j < order; j++)
      sum += qlp_coeff[j] * data[i-j-1];
    data[i] = residual[i] + (sum >> lp_quantization);
  }
  */
}
#else /* fully unrolled version for normal use */
{
  int i;
  FLAC__int32 sum;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  /*
   * We do unique versions up to 12th order since that's the subset limit.
   * Also they are roughly ordered to match frequency of occurrence to
   * minimize branching.
   */
  if(order <= 12) {
    if(order > 8) {
      if(order > 10) {
        if(order == 12) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[11] * data[i-12];
            sum += qlp_coeff[10] * data[i-11];
            sum += qlp_coeff[9] * data[i-10];
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
        else { /* order == 11 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[10] * data[i-11];
            sum += qlp_coeff[9] * data[i-10];
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 10) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[9] * data[i-10];
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
        else { /* order == 9 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[8] * data[i-9];
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
      }
    }
    else if(order > 4) {
      if(order > 6) {
        if(order == 8) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[7] * data[i-8];
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
        else { /* order == 7 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[6] * data[i-7];
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 6) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[5] * data[i-6];
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
        else { /* order == 5 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[4] * data[i-5];
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
      }
    }
    else {
      if(order > 2) {
        if(order == 4) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[3] * data[i-4];
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
        else { /* order == 3 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[2] * data[i-3];
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
      }
      else {
        if(order == 2) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[1] * data[i-2];
            sum += qlp_coeff[0] * data[i-1];
            data[i] = residual[i] + (sum >> lp_quantization);
          }
        }
        else { /* order == 1 */
          for(i = 0; i < (int)data_len; i++)
            data[i] = residual[i] + ((qlp_coeff[0] * data[i-1]) >> lp_quantization);
        }
      }
    }
  }
  else { /* order > 12 */
    for(i = 0; i < (int)data_len; i++) {
      sum = 0;
      switch(order) {
        case 32: sum += qlp_coeff[31] * data[i-32]; /* Falls through. */
        case 31: sum += qlp_coeff[30] * data[i-31]; /* Falls through. */
        case 30: sum += qlp_coeff[29] * data[i-30]; /* Falls through. */
        case 29: sum += qlp_coeff[28] * data[i-29]; /* Falls through. */
        case 28: sum += qlp_coeff[27] * data[i-28]; /* Falls through. */
        case 27: sum += qlp_coeff[26] * data[i-27]; /* Falls through. */
        case 26: sum += qlp_coeff[25] * data[i-26]; /* Falls through. */
        case 25: sum += qlp_coeff[24] * data[i-25]; /* Falls through. */
        case 24: sum += qlp_coeff[23] * data[i-24]; /* Falls through. */
        case 23: sum += qlp_coeff[22] * data[i-23]; /* Falls through. */
        case 22: sum += qlp_coeff[21] * data[i-22]; /* Falls through. */
        case 21: sum += qlp_coeff[20] * data[i-21]; /* Falls through. */
        case 20: sum += qlp_coeff[19] * data[i-20]; /* Falls through. */
        case 19: sum += qlp_coeff[18] * data[i-19]; /* Falls through. */
        case 18: sum += qlp_coeff[17] * data[i-18]; /* Falls through. */
        case 17: sum += qlp_coeff[16] * data[i-17]; /* Falls through. */
        case 16: sum += qlp_coeff[15] * data[i-16]; /* Falls through. */
        case 15: sum += qlp_coeff[14] * data[i-15]; /* Falls through. */
        case 14: sum += qlp_coeff[13] * data[i-14]; /* Falls through. */
        case 13: sum += qlp_coeff[12] * data[i-13];
                 sum += qlp_coeff[11] * data[i-12];
                 sum += qlp_coeff[10] * data[i-11];
                 sum += qlp_coeff[ 9] * data[i-10];
                 sum += qlp_coeff[ 8] * data[i- 9];
                 sum += qlp_coeff[ 7] * data[i- 8];
                 sum += qlp_coeff[ 6] * data[i- 7];
                 sum += qlp_coeff[ 5] * data[i- 6];
                 sum += qlp_coeff[ 4] * data[i- 5];
                 sum += qlp_coeff[ 3] * data[i- 4];
                 sum += qlp_coeff[ 2] * data[i- 3];
                 sum += qlp_coeff[ 1] * data[i- 2];
                 sum += qlp_coeff[ 0] * data[i- 1];
      }
      data[i] = residual[i] + (sum >> lp_quantization);
    }
  }
}
#endif

void FLAC__lpc_restore_signal_wide(const FLAC__int32 * flac_restrict residual, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int32 * flac_restrict data)
#if defined(FLAC__OVERFLOW_DETECT) || !defined(FLAC__LPC_UNROLLED_FILTER_LOOPS)
{
  uint32_t i, j;
  FLAC__int64 sum;
  const FLAC__int32 *r = residual, *history;

#ifdef FLAC__OVERFLOW_DETECT_VERBOSE
  fprintf(stderr,"FLAC__lpc_restore_signal_wide: data_len=%d, order=%u, lpq=%d",data_len,order,lp_quantization);
  for(i=0;i<order;i++)
    fprintf(stderr,", q[%u]=%d",i,qlp_coeff[i]);
  fprintf(stderr,"\n");
#endif
  FLAC__ASSERT(order > 0);

  for(i = 0; i < data_len; i++) {
    sum = 0;
    history = data;
    for(j = 0; j < order; j++)
      sum += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*(--history));
#ifdef FLAC__OVERFLOW_DETECT
    if(FLAC__bitmath_silog2((FLAC__int64)(*r) + (sum >> lp_quantization)) > 32) {
      fprintf(stderr,"FLAC__lpc_restore_signal_wide: OVERFLOW, i=%u, residual=%d, sum=%" PRId64 ", data=%" PRId64 "\n", i, *r, (sum >> lp_quantization), ((FLAC__int64)(*r) + (sum >> lp_quantization)));
      break;
    }
#endif
    *(data++) = (FLAC__int32)(*(r++) + (sum >> lp_quantization));
  }
}
#else /* fully unrolled version for normal use */
{
  int i;
  FLAC__int64 sum;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  /*
   * We do unique versions up to 12th order since that's the subset limit.
   * Also they are roughly ordered to match frequency of occurrence to
   * minimize branching.
   */
  if(order <= 12) {
    if(order > 8) {
      if(order > 10) {
        if(order == 12) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[11] * (FLAC__int64)data[i-12];
            sum += qlp_coeff[10] * (FLAC__int64)data[i-11];
            sum += qlp_coeff[9] * (FLAC__int64)data[i-10];
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
        else { /* order == 11 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[10] * (FLAC__int64)data[i-11];
            sum += qlp_coeff[9] * (FLAC__int64)data[i-10];
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
      }
      else {
        if(order == 10) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[9] * (FLAC__int64)data[i-10];
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
        else { /* order == 9 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[8] * (FLAC__int64)data[i-9];
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
      }
    }
    else if(order > 4) {
      if(order > 6) {
        if(order == 8) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[7] * (FLAC__int64)data[i-8];
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
        else { /* order == 7 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[6] * (FLAC__int64)data[i-7];
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
      }
      else {
        if(order == 6) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[5] * (FLAC__int64)data[i-6];
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
        else { /* order == 5 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[4] * (FLAC__int64)data[i-5];
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
      }
    }
    else {
      if(order > 2) {
        if(order == 4) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[3] * (FLAC__int64)data[i-4];
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
        else { /* order == 3 */
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[2] * (FLAC__int64)data[i-3];
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
      }
      else {
        if(order == 2) {
          for(i = 0; i < (int)data_len; i++) {
            sum = 0;
            sum += qlp_coeff[1] * (FLAC__int64)data[i-2];
            sum += qlp_coeff[0] * (FLAC__int64)data[i-1];
            data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
          }
        }
        else { /* order == 1 */
          for(i = 0; i < (int)data_len; i++)
            data[i] = (FLAC__int32)(residual[i] + ((qlp_coeff[0] * (FLAC__int64)data[i-1]) >> lp_quantization));
        }
      }
    }
  }
  else { /* order > 12 */
    for(i = 0; i < (int)data_len; i++) {
      sum = 0;
      switch(order) {
        case 32: sum += qlp_coeff[31] * (FLAC__int64)data[i-32]; /* Falls through. */
        case 31: sum += qlp_coeff[30] * (FLAC__int64)data[i-31]; /* Falls through. */
        case 30: sum += qlp_coeff[29] * (FLAC__int64)data[i-30]; /* Falls through. */
        case 29: sum += qlp_coeff[28] * (FLAC__int64)data[i-29]; /* Falls through. */
        case 28: sum += qlp_coeff[27] * (FLAC__int64)data[i-28]; /* Falls through. */
        case 27: sum += qlp_coeff[26] * (FLAC__int64)data[i-27]; /* Falls through. */
        case 26: sum += qlp_coeff[25] * (FLAC__int64)data[i-26]; /* Falls through. */
        case 25: sum += qlp_coeff[24] * (FLAC__int64)data[i-25]; /* Falls through. */
        case 24: sum += qlp_coeff[23] * (FLAC__int64)data[i-24]; /* Falls through. */
        case 23: sum += qlp_coeff[22] * (FLAC__int64)data[i-23]; /* Falls through. */
        case 22: sum += qlp_coeff[21] * (FLAC__int64)data[i-22]; /* Falls through. */
        case 21: sum += qlp_coeff[20] * (FLAC__int64)data[i-21]; /* Falls through. */
        case 20: sum += qlp_coeff[19] * (FLAC__int64)data[i-20]; /* Falls through. */
        case 19: sum += qlp_coeff[18] * (FLAC__int64)data[i-19]; /* Falls through. */
        case 18: sum += qlp_coeff[17] * (FLAC__int64)data[i-18]; /* Falls through. */
        case 17: sum += qlp_coeff[16] * (FLAC__int64)data[i-17]; /* Falls through. */
        case 16: sum += qlp_coeff[15] * (FLAC__int64)data[i-16]; /* Falls through. */
        case 15: sum += qlp_coeff[14] * (FLAC__int64)data[i-15]; /* Falls through. */
        case 14: sum += qlp_coeff[13] * (FLAC__int64)data[i-14]; /* Falls through. */
        case 13: sum += qlp_coeff[12] * (FLAC__int64)data[i-13];
                 sum += qlp_coeff[11] * (FLAC__int64)data[i-12];
                 sum += qlp_coeff[10] * (FLAC__int64)data[i-11];
                 sum += qlp_coeff[ 9] * (FLAC__int64)data[i-10];
                 sum += qlp_coeff[ 8] * (FLAC__int64)data[i- 9];
                 sum += qlp_coeff[ 7] * (FLAC__int64)data[i- 8];
                 sum += qlp_coeff[ 6] * (FLAC__int64)data[i- 7];
                 sum += qlp_coeff[ 5] * (FLAC__int64)data[i- 6];
                 sum += qlp_coeff[ 4] * (FLAC__int64)data[i- 5];
                 sum += qlp_coeff[ 3] * (FLAC__int64)data[i- 4];
                 sum += qlp_coeff[ 2] * (FLAC__int64)data[i- 3];
                 sum += qlp_coeff[ 1] * (FLAC__int64)data[i- 2];
                 sum += qlp_coeff[ 0] * (FLAC__int64)data[i- 1];
      }
      data[i] = (FLAC__int32) (residual[i] + (sum >> lp_quantization));
    }
  }
}
#endif

#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && !defined(FUZZING_BUILD_MODE_FLAC_SANITIZE_SIGNED_INTEGER_OVERFLOW)
/* The attribute below is to silence the undefined sanitizer of oss-fuzz.
 * Because fuzzing feeds bogus predictors and residual samples to the
 * decoder, having overflows in this section is unavoidable. Also,
 * because the calculated values are audio path only, there is no
 * potential for security problems */
__attribute__((no_sanitize("signed-integer-overflow")))
#endif
void FLAC__lpc_restore_signal_wide_33bit(const FLAC__int32 * flac_restrict residual, uint32_t data_len, const FLAC__int32 * flac_restrict qlp_coeff, uint32_t order, int lp_quantization, FLAC__int64 * flac_restrict data)
#if defined(FLAC__OVERFLOW_DETECT) || !defined(FLAC__LPC_UNROLLED_FILTER_LOOPS)
{
  uint32_t i, j;
  FLAC__int64 sum;
  const FLAC__int32 *r = residual;
  const FLAC__int64 *history;

  FLAC__ASSERT(order > 0);

  for(i = 0; i < data_len; i++) {
    sum = 0;
    history = data;
    for(j = 0; j < order; j++)
      sum += (FLAC__int64)qlp_coeff[j] * (FLAC__int64)(*(--history));
#ifdef FLAC__OVERFLOW_DETECT
    if(FLAC__bitmath_silog2((FLAC__int64)(*r) + (sum >> lp_quantization)) > 33) {
      fprintf(stderr,"FLAC__lpc_restore_signal_33bit: OVERFLOW, i=%u, residual=%d, sum=%" PRId64 ", data=%" PRId64 "\n", i, *r, (sum >> lp_quantization), ((FLAC__int64)(*r) + (sum >> lp_quantization)));
      break;
    }
#endif
    *(data++) = (FLAC__int64)(*(r++)) + (sum >> lp_quantization);
  }
}
#else /* unrolled version for normal use */
{
  int i;
  FLAC__int64 sum;

  FLAC__ASSERT(order > 0);
  FLAC__ASSERT(order <= 32);

  for(i = 0; i < (int)data_len; i++) {
    sum = 0;
    switch(order) {
      case 32: sum += qlp_coeff[31] * data[i-32]; /* Falls through. */
      case 31: sum += qlp_coeff[30] * data[i-31]; /* Falls through. */
      case 30: sum += qlp_coeff[29] * data[i-30]; /* Falls through. */
      case 29: sum += qlp_coeff[28] * data[i-29]; /* Falls through. */
      case 28: sum += qlp_coeff[27] * data[i-28]; /* Falls through. */
      case 27: sum += qlp_coeff[26] * data[i-27]; /* Falls through. */
      case 26: sum += qlp_coeff[25] * data[i-26]; /* Falls through. */
      case 25: sum += qlp_coeff[24] * data[i-25]; /* Falls through. */
      case 24: sum += qlp_coeff[23] * data[i-24]; /* Falls through. */
      case 23: sum += qlp_coeff[22] * data[i-23]; /* Falls through. */
      case 22: sum += qlp_coeff[21] * data[i-22]; /* Falls through. */
      case 21: sum += qlp_coeff[20] * data[i-21]; /* Falls through. */
      case 20: sum += qlp_coeff[19] * data[i-20]; /* Falls through. */
      case 19: sum += qlp_coeff[18] * data[i-19]; /* Falls through. */
      case 18: sum += qlp_coeff[17] * data[i-18]; /* Falls through. */
      case 17: sum += qlp_coeff[16] * data[i-17]; /* Falls through. */
      case 16: sum += qlp_coeff[15] * data[i-16]; /* Falls through. */
      case 15: sum += qlp_coeff[14] * data[i-15]; /* Falls through. */
      case 14: sum += qlp_coeff[13] * data[i-14]; /* Falls through. */
      case 13: sum += qlp_coeff[12] * data[i-13]; /* Falls through. */
      case 12: sum += qlp_coeff[11] * data[i-12]; /* Falls through. */
      case 11: sum += qlp_coeff[10] * data[i-11]; /* Falls through. */
      case 10: sum += qlp_coeff[ 9] * data[i-10]; /* Falls through. */
      case  9: sum += qlp_coeff[ 8] * data[i- 9]; /* Falls through. */
      case  8: sum += qlp_coeff[ 7] * data[i- 8]; /* Falls through. */
      case  7: sum += qlp_coeff[ 6] * data[i- 7]; /* Falls through. */
      case  6: sum += qlp_coeff[ 5] * data[i- 6]; /* Falls through. */
      case  5: sum += qlp_coeff[ 4] * data[i- 5]; /* Falls through. */
      case  4: sum += qlp_coeff[ 3] * data[i- 4]; /* Falls through. */
      case  3: sum += qlp_coeff[ 2] * data[i- 3]; /* Falls through. */
      case  2: sum += qlp_coeff[ 1] * data[i- 2]; /* Falls through. */
      case  1: sum += qlp_coeff[ 0] * data[i- 1];
    }
    data[i] = residual[i] + (sum >> lp_quantization);
  }
}
#endif

#if defined(_MSC_VER)
#pragma warning ( default : 4028 )
#endif

#ifndef FLAC__INTEGER_ONLY_LIBRARY

double FLAC__lpc_compute_expected_bits_per_residual_sample(double lpc_error, uint32_t total_samples)
{
  double error_scale;

  FLAC__ASSERT(total_samples > 0);

  error_scale = 0.5 / (double)total_samples;

  return FLAC__lpc_compute_expected_bits_per_residual_sample_with_error_scale(lpc_error, error_scale);
}

double FLAC__lpc_compute_expected_bits_per_residual_sample_with_error_scale(double lpc_error, double error_scale)
{
  if(lpc_error > 0.0) {
    double bps = (double)0.5 * log(error_scale * lpc_error) / M_LN2;
    if(bps >= 0.0)
      return bps;
    else
      return 0.0;
  }
  else if(lpc_error < 0.0) { /* error should not be negative but can happen due to inadequate floating-point resolution */
    return 1e32;
  }
  else {
    return 0.0;
  }
}

uint32_t FLAC__lpc_compute_best_order(const double lpc_error[], uint32_t max_order, uint32_t total_samples, uint32_t overhead_bits_per_order)
{
  uint32_t order, indx, best_index; /* 'index' the index into lpc_error; index==order-1 since lpc_error[0] is for order==1, lpc_error[1] is for order==2, etc */
  double bits, best_bits, error_scale;

  FLAC__ASSERT(max_order > 0);
  FLAC__ASSERT(total_samples > 0);

  error_scale = 0.5 / (double)total_samples;

  best_index = 0;
  best_bits = (uint32_t)(-1);

  for(indx = 0, order = 1; indx < max_order; indx++, order++) {
    bits = FLAC__lpc_compute_expected_bits_per_residual_sample_with_error_scale(lpc_error[indx], error_scale) * (double)(total_samples - order) + (double)(order * overhead_bits_per_order);
    if(bits < best_bits) {
      best_index = indx;
      best_bits = bits;
    }
  }

  return best_index+1; /* +1 since indx of lpc_error[] is order-1 */
}

#endif /* !defined FLAC__INTEGER_ONLY_LIBRARY */

Coverage Report

Created: 2023-06-29 06:15