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extra2.c

////////////////////////////////////////////////////////////////////////////
//                     **** WAVPACK ****                      //
//              Hybrid Lossless Wavefile Compressor                 //
//          Copyright (c) 1998 - 2006 Conifer Software.             //
//                    All Rights Reserved.                    //
//      Distributed under the BSD Software License (see license.txt)      //
////////////////////////////////////////////////////////////////////////////

// extra2.c

// This module handles the "extra" mode for stereo files.

#include "wavpack_local.h"

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

#define LOG_LIMIT 6912
//#define EXTRA_DUMP

#ifdef DEBUG_ALLOC
#define malloc malloc_db
#define realloc realloc_db
#define free free_db
void *malloc_db (uint32_t size);
void *realloc_db (void *ptr, uint32_t size);
void free_db (void *ptr);
int32_t dump_alloc (void);
#endif

//////////////////////////////// local tables ///////////////////////////////

typedef struct {
    int32_t *sampleptrs [MAX_NTERMS+2];
    struct decorr_pass dps [MAX_NTERMS];
    int nterms, log_limit;
    uint32_t best_bits;
} WavpackExtraInfo;

static void decorr_stereo_pass (int32_t *in_samples, int32_t *out_samples, int32_t num_samples, struct decorr_pass *dpp, int dir)
{
    int m = 0, i;

    dpp->sum_A = dpp->sum_B = 0;

    if (dir < 0) {
      out_samples += (num_samples - 1) * 2;
      in_samples += (num_samples - 1) * 2;
      dir = -2;
    }
    else
      dir = 2;

    dpp->weight_A = restore_weight (store_weight (dpp->weight_A));
    dpp->weight_B = restore_weight (store_weight (dpp->weight_B));

    for (i = 0; i < 8; ++i) {
      dpp->samples_A [i] = exp2s (log2s (dpp->samples_A [i]));
      dpp->samples_B [i] = exp2s (log2s (dpp->samples_B [i]));
    }

    if (dpp->term == 17) {
      while (num_samples--) {
          int32_t left, right;
          int32_t sam_A, sam_B;

          sam_A = 2 * dpp->samples_A [0] - dpp->samples_A [1];
          dpp->samples_A [1] = dpp->samples_A [0];
          dpp->samples_A [0] = left = in_samples [0];
          left -= apply_weight (dpp->weight_A, sam_A);
          update_weight (dpp->weight_A, dpp->delta, sam_A, left);
          dpp->sum_A += dpp->weight_A;
          out_samples [0] = left;

          sam_B = 2 * dpp->samples_B [0] - dpp->samples_B [1];
          dpp->samples_B [1] = dpp->samples_B [0];
          dpp->samples_B [0] = right = in_samples [1];
          right -= apply_weight (dpp->weight_B, sam_B);
          update_weight (dpp->weight_B, dpp->delta, sam_B, right);
          dpp->sum_B += dpp->weight_B;
          out_samples [1] = right;
          in_samples += dir;
          out_samples += dir;
      }
    }
    else if (dpp->term == 18) {
      while (num_samples--) {
          int32_t left, right;
          int32_t sam_A, sam_B;

          sam_A = (3 * dpp->samples_A [0] - dpp->samples_A [1]) >> 1;
          dpp->samples_A [1] = dpp->samples_A [0];
          dpp->samples_A [0] = left = in_samples [0];
          left -= apply_weight (dpp->weight_A, sam_A);
          update_weight (dpp->weight_A, dpp->delta, sam_A, left);
          dpp->sum_A += dpp->weight_A;
          out_samples [0] = left;

          sam_B = (3 * dpp->samples_B [0] - dpp->samples_B [1]) >> 1;
          dpp->samples_B [1] = dpp->samples_B [0];
          dpp->samples_B [0] = right = in_samples [1];
          right -= apply_weight (dpp->weight_B, sam_B);
          update_weight (dpp->weight_B, dpp->delta, sam_B, right);
          dpp->sum_B += dpp->weight_B;
          out_samples [1] = right;
          in_samples += dir;
          out_samples += dir;
      }
    }
    else if (dpp->term > 0) {
      while (num_samples--) {
          int k = (m + dpp->term) & (MAX_TERM - 1);
          int32_t left, right;
          int32_t sam_A, sam_B;

          sam_A = dpp->samples_A [m];
          dpp->samples_A [k] = left = in_samples [0];
          left -= apply_weight (dpp->weight_A, sam_A);
          update_weight (dpp->weight_A, dpp->delta, sam_A, left);
          dpp->sum_A += dpp->weight_A;
          out_samples [0] = left;

          sam_B = dpp->samples_B [m];
          dpp->samples_B [k] = right = in_samples [1];
          right -= apply_weight (dpp->weight_B, sam_B);
          update_weight (dpp->weight_B, dpp->delta, sam_B, right);
          dpp->sum_B += dpp->weight_B;
          out_samples [1] = right;
          in_samples += dir;
          out_samples += dir;
          m = (m + 1) & (MAX_TERM - 1);
      }
    }
    else if (dpp->term == -1) {
      while (num_samples--) {
          int32_t left = in_samples [0];
          int32_t right = in_samples [1];
          int32_t sam_A = dpp->samples_A [0], sam_B = left;

          dpp->samples_A [0] = right;
          right -= apply_weight (dpp->weight_B, sam_B);
          update_weight_clip (dpp->weight_B, dpp->delta, sam_B, right);
          left -= apply_weight (dpp->weight_A, sam_A);
          update_weight_clip (dpp->weight_A, dpp->delta, sam_A, left);
          dpp->sum_A += dpp->weight_A;
          dpp->sum_B += dpp->weight_B;
          out_samples [0] = left;
          out_samples [1] = right;
          in_samples += dir;
          out_samples += dir;
      }
    }
    else if (dpp->term == -2) {
      while (num_samples--) {
          int32_t left = in_samples [0];
          int32_t right = in_samples [1];
          int32_t sam_B = dpp->samples_B [0], sam_A = right;

          dpp->samples_B [0] = left;
          left -= apply_weight (dpp->weight_A, sam_A);
          update_weight_clip (dpp->weight_A, dpp->delta, sam_A, left);
          right -= apply_weight (dpp->weight_B, sam_B);
          update_weight_clip (dpp->weight_B, dpp->delta, sam_B, right);
          dpp->sum_A += dpp->weight_A;
          dpp->sum_B += dpp->weight_B;
          out_samples [0] = left;
          out_samples [1] = right;
          in_samples += dir;
          out_samples += dir;
      }
    }
    else if (dpp->term == -3) {
      while (num_samples--) {
          int32_t left = in_samples [0];
          int32_t right = in_samples [1];
          int32_t sam_A = dpp->samples_A [0], sam_B = dpp->samples_B [0];

          dpp->samples_A [0] = right;
          dpp->samples_B [0] = left;
          left -= apply_weight (dpp->weight_A, sam_A);
          update_weight_clip (dpp->weight_A, dpp->delta, sam_A, left);
          right -= apply_weight (dpp->weight_B, sam_B);
          update_weight_clip (dpp->weight_B, dpp->delta, sam_B, right);
          dpp->sum_A += dpp->weight_A;
          dpp->sum_B += dpp->weight_B;
          out_samples [0] = left;
          out_samples [1] = right;
          in_samples += dir;
          out_samples += dir;
      }
    }

    if (m && dpp->term > 0 && dpp->term <= MAX_TERM) {
      int32_t temp_A [MAX_TERM], temp_B [MAX_TERM];
      int k;

      memcpy (temp_A, dpp->samples_A, sizeof (dpp->samples_A));
      memcpy (temp_B, dpp->samples_B, sizeof (dpp->samples_B));

      for (k = 0; k < MAX_TERM; k++) {
          dpp->samples_A [k] = temp_A [m];
          dpp->samples_B [k] = temp_B [m];
          m = (m + 1) & (MAX_TERM - 1);
      }
    }
}

static void reverse_decorr (struct decorr_pass *dpp)
{
    if (dpp->term > MAX_TERM) {
      int32_t sam_A, sam_B;

      if (dpp->term & 1) {
          sam_A = 2 * dpp->samples_A [0] - dpp->samples_A [1];
          sam_B = 2 * dpp->samples_B [0] - dpp->samples_B [1];
      }
      else {
          sam_A = (3 * dpp->samples_A [0] - dpp->samples_A [1]) >> 1;
          sam_B = (3 * dpp->samples_B [0] - dpp->samples_B [1]) >> 1;
      }

      dpp->samples_A [1] = dpp->samples_A [0];
      dpp->samples_B [1] = dpp->samples_B [0];
      dpp->samples_A [0] = sam_A;
      dpp->samples_B [0] = sam_B;

      if (dpp->term & 1) {
          sam_A = 2 * dpp->samples_A [0] - dpp->samples_A [1];
          sam_B = 2 * dpp->samples_B [0] - dpp->samples_B [1];
      }
      else {
          sam_A = (3 * dpp->samples_A [0] - dpp->samples_A [1]) >> 1;
          sam_B = (3 * dpp->samples_B [0] - dpp->samples_B [1]) >> 1;
      }

      dpp->samples_A [1] = sam_A;
      dpp->samples_B [1] = sam_B;
    }
    else if (dpp->term > 1) {
      int i = 0, j = dpp->term - 1, cnt = dpp->term / 2;

      while (cnt--) {
          i &= (MAX_TERM - 1);
          j &= (MAX_TERM - 1);
          dpp->samples_A [i] ^= dpp->samples_A [j];
          dpp->samples_A [j] ^= dpp->samples_A [i];
          dpp->samples_A [i] ^= dpp->samples_A [j];
          dpp->samples_B [i] ^= dpp->samples_B [j];
          dpp->samples_B [j] ^= dpp->samples_B [i];
          dpp->samples_B [i++] ^= dpp->samples_B [j--];
      }
    }
    else if (dpp->term == -1) {
    }
    else if (dpp->term == -2) {
    }
    else if (dpp->term == -3) {
    }
}

static void decorr_stereo_buffer (int32_t *samples, int32_t *outsamples, int32_t num_samples, struct decorr_pass *dpp, int tindex)
{
    struct decorr_pass dp, *dppi = dpp + tindex;
    int delta = dppi->delta, pre_delta;
    int term = dppi->term;

    if (delta == 7)
      pre_delta = 7;
    else if (delta < 2)
      pre_delta = 3;
    else
      pre_delta = delta + 1;

    CLEAR (dp);
    dp.term = term;
    dp.delta = pre_delta;
    decorr_stereo_pass (samples, outsamples, num_samples > 2048 ? 2048 : num_samples, &dp, -1);
    dp.delta = delta;

    if (tindex == 0)
        reverse_decorr (&dp);
    else {
      CLEAR (dp.samples_A);
      CLEAR (dp.samples_B);
    }

    memcpy (dppi->samples_A, dp.samples_A, sizeof (dp.samples_A));
    memcpy (dppi->samples_B, dp.samples_B, sizeof (dp.samples_B));
    dppi->weight_A = dp.weight_A;
    dppi->weight_B = dp.weight_B;

    if (delta == 0) {
      dp.delta = 1;
      decorr_stereo_pass (samples, outsamples, num_samples, &dp, 1);
      dp.delta = 0;
      memcpy (dp.samples_A, dppi->samples_A, sizeof (dp.samples_A));
      memcpy (dp.samples_B, dppi->samples_B, sizeof (dp.samples_B));
      dppi->weight_A = dp.weight_A = dp.sum_A / num_samples;
      dppi->weight_B = dp.weight_B = dp.sum_B / num_samples;
    }

//    if (memcmp (dppi, &dp, sizeof (dp)))
//    error_line ("decorr_passes don't match, delta = %d", delta);

    decorr_stereo_pass (samples, outsamples, num_samples, &dp, 1);
}

static void recurse_stereo (WavpackContext *wpc, WavpackExtraInfo *info, int depth, int delta, uint32_t input_bits)
{
    WavpackStream *wps = wpc->streams [wpc->current_stream];
    int term, branches = ((wpc->config.extra_flags & EXTRA_BRANCHES) >> 6) - depth;
    int32_t *samples, *outsamples;
    uint32_t term_bits [22], bits;

    if (branches < 1 || depth + 1 == info->nterms)
      branches = 1;

    CLEAR (term_bits);
    samples = info->sampleptrs [depth];
    outsamples = info->sampleptrs [depth + 1];

    for (term = -3; term <= 18; ++term) {
      if (!term || (term > 8 && term < 17))
          continue;

      if (term == 17 && branches == 1 && depth + 1 < info->nterms)
          continue;

      if (term == -1 || term == -2)
          if (!(wps->wphdr.flags & CROSS_DECORR))
            continue;

      if ((wpc->config.flags & CONFIG_FAST_FLAG) && (term > 4 && term < 17))
          continue;

      info->dps [depth].term = term;
      info->dps [depth].delta = delta;
      decorr_stereo_buffer (samples, outsamples, wps->wphdr.block_samples, info->dps, depth);
      bits = log2buffer (outsamples, wps->wphdr.block_samples * 2, info->log_limit);

      if (bits < info->best_bits) {
          info->best_bits = bits;
          CLEAR (wps->decorr_passes);
          memcpy (wps->decorr_passes, info->dps, sizeof (info->dps [0]) * (depth + 1));
          memcpy (info->sampleptrs [info->nterms + 1], info->sampleptrs [depth + 1], wps->wphdr.block_samples * 8);
      }

      term_bits [term + 3] = bits;
    }

    while (depth + 1 < info->nterms && branches--) {
      uint32_t local_best_bits = input_bits;
      int best_term = 0, i;

      for (i = 0; i < 22; ++i)
          if (term_bits [i] && term_bits [i] < local_best_bits) {
            local_best_bits = term_bits [i];
//          term_bits [i] = 0;
            best_term = i - 3;
          }

      if (!best_term)
          break;

      term_bits [best_term + 3] = 0;

      info->dps [depth].term = best_term;
      info->dps [depth].delta = delta;
      decorr_stereo_buffer (samples, outsamples, wps->wphdr.block_samples, info->dps, depth);

//    if (log2buffer (outsamples, wps->wphdr.block_samples * 2, 0) != local_best_bits)
//        error_line ("data doesn't match!");

      recurse_stereo (wpc, info, depth + 1, delta, local_best_bits);
    }
}

static void delta_stereo (WavpackContext *wpc, WavpackExtraInfo *info)
{
    WavpackStream *wps = wpc->streams [wpc->current_stream];
    int lower = FALSE;
    int delta, d;
    uint32_t bits;

    if (wps->decorr_passes [0].term)
      delta = wps->decorr_passes [0].delta;
    else
      return;

    for (d = delta - 1; d >= 0; --d) {
      int i;

      if (!d && (wps->wphdr.flags & HYBRID_FLAG))
          break;

      for (i = 0; i < info->nterms && wps->decorr_passes [i].term; ++i) {
          info->dps [i].term = wps->decorr_passes [i].term;
          info->dps [i].delta = d;
          decorr_stereo_buffer (info->sampleptrs [i], info->sampleptrs [i+1], wps->wphdr.block_samples, info->dps, i);
      }

      bits = log2buffer (info->sampleptrs [i], wps->wphdr.block_samples * 2, info->log_limit);

      if (bits < info->best_bits) {
          lower = TRUE;
          info->best_bits = bits;
          CLEAR (wps->decorr_passes);
          memcpy (wps->decorr_passes, info->dps, sizeof (info->dps [0]) * i);
          memcpy (info->sampleptrs [info->nterms + 1], info->sampleptrs [i], wps->wphdr.block_samples * 8);
      }
      else
          break;
    }

    for (d = delta + 1; !lower && d <= 7; ++d) {
      int i;

      for (i = 0; i < info->nterms && wps->decorr_passes [i].term; ++i) {
          info->dps [i].term = wps->decorr_passes [i].term;
          info->dps [i].delta = d;
          decorr_stereo_buffer (info->sampleptrs [i], info->sampleptrs [i+1], wps->wphdr.block_samples, info->dps, i);
      }

      bits = log2buffer (info->sampleptrs [i], wps->wphdr.block_samples * 2, info->log_limit);

      if (bits < info->best_bits) {
          info->best_bits = bits;
          CLEAR (wps->decorr_passes);
          memcpy (wps->decorr_passes, info->dps, sizeof (info->dps [0]) * i);
          memcpy (info->sampleptrs [info->nterms + 1], info->sampleptrs [i], wps->wphdr.block_samples * 8);
      }
      else
          break;
    }
}

static void sort_stereo (WavpackContext *wpc, WavpackExtraInfo *info)
{
    WavpackStream *wps = wpc->streams [wpc->current_stream];
    int reversed = TRUE;
    uint32_t bits;

    while (reversed) {
      int ri, i;

      memcpy (info->dps, wps->decorr_passes, sizeof (wps->decorr_passes));
      reversed = FALSE;

      for (ri = 0; ri < info->nterms && wps->decorr_passes [ri].term; ++ri) {

          if (ri + 1 >= info->nterms || !wps->decorr_passes [ri+1].term)
            break;

          if (wps->decorr_passes [ri].term == wps->decorr_passes [ri+1].term) {
            decorr_stereo_buffer (info->sampleptrs [ri], info->sampleptrs [ri+1], wps->wphdr.block_samples, info->dps, ri);
            continue;
          }

          info->dps [ri] = wps->decorr_passes [ri+1];
          info->dps [ri+1] = wps->decorr_passes [ri];

          for (i = ri; i < info->nterms && wps->decorr_passes [i].term; ++i)
            decorr_stereo_buffer (info->sampleptrs [i], info->sampleptrs [i+1], wps->wphdr.block_samples, info->dps, i);

          bits = log2buffer (info->sampleptrs [i], wps->wphdr.block_samples * 2, info->log_limit);

          if (bits < info->best_bits) {
            reversed = TRUE;
            info->best_bits = bits;
            CLEAR (wps->decorr_passes);
            memcpy (wps->decorr_passes, info->dps, sizeof (info->dps [0]) * i);
            memcpy (info->sampleptrs [info->nterms + 1], info->sampleptrs [i], wps->wphdr.block_samples * 8);
          }
          else {
            info->dps [ri] = wps->decorr_passes [ri];
            info->dps [ri+1] = wps->decorr_passes [ri+1];
            decorr_stereo_buffer (info->sampleptrs [ri], info->sampleptrs [ri+1], wps->wphdr.block_samples, info->dps, ri);
          }
      }
    }
}

static const uint32_t xtable [] = { 91, 123, 187, 251 };

static void analyze_stereo (WavpackContext *wpc, int32_t *samples, int do_samples)
{
    WavpackStream *wps = wpc->streams [wpc->current_stream];
    WavpackExtraInfo info;
    int i;

#ifdef LOG_LIMIT
    info.log_limit = (((wps->wphdr.flags & MAG_MASK) >> MAG_LSB) + 4) * 256;

    if (info.log_limit > LOG_LIMIT)
      info.log_limit = LOG_LIMIT;
#else
    info.log_limit = 0;
#endif

    if (wpc->config.flags & (CONFIG_HIGH_FLAG | CONFIG_VERY_HIGH_FLAG))
      wpc->config.extra_flags = xtable [wpc->config.xmode - 4];
    else
      wpc->config.extra_flags = xtable [wpc->config.xmode - 3];

    info.nterms = wps->num_terms;

    for (i = 0; i < info.nterms + 2; ++i)
      info.sampleptrs [i] = malloc (wps->wphdr.block_samples * 8);

    memcpy (info.dps, wps->decorr_passes, sizeof (info.dps));
    memcpy (info.sampleptrs [0], samples, wps->wphdr.block_samples * 8);

    for (i = 0; i < info.nterms && info.dps [i].term; ++i)
      decorr_stereo_pass (info.sampleptrs [i], info.sampleptrs [i + 1], wps->wphdr.block_samples, info.dps + i, 1);

    info.best_bits = log2buffer (info.sampleptrs [info.nterms], wps->wphdr.block_samples * 2, 0) * 1;
    memcpy (info.sampleptrs [info.nterms + 1], info.sampleptrs [i], wps->wphdr.block_samples * 8);

    if (wpc->config.extra_flags & EXTRA_BRANCHES)
      recurse_stereo (wpc, &info, 0, (int) floor (wps->delta_decay + 0.5),
          log2buffer (info.sampleptrs [0], wps->wphdr.block_samples * 2, 0));

    if (wpc->config.extra_flags & EXTRA_SORT_FIRST)
      sort_stereo (wpc, &info);

    if (wpc->config.extra_flags & EXTRA_TRY_DELTAS) {
      delta_stereo (wpc, &info);

      if ((wpc->config.extra_flags & EXTRA_ADJUST_DELTAS) && wps->decorr_passes [0].term)
          wps->delta_decay = (float)((wps->delta_decay * 2.0 + wps->decorr_passes [0].delta) / 3.0);
      else
          wps->delta_decay = 2.0;
    }

    if (wpc->config.extra_flags & EXTRA_SORT_LAST)
      sort_stereo (wpc, &info);

    if (do_samples)
      memcpy (samples, info.sampleptrs [info.nterms + 1], wps->wphdr.block_samples * 8);

    for (i = 0; i < info.nterms; ++i)
      if (!wps->decorr_passes [i].term)
          break;

    wps->num_terms = i;

    for (i = 0; i < info.nterms + 2; ++i)
      free (info.sampleptrs [i]);
}

static void stereo_add_noise (WavpackStream *wps, int32_t *lptr, int32_t *rptr)
{
    int shaping_weight, new = wps->wphdr.flags & NEW_SHAPING;
    int32_t error [2], temp, cnt;

    scan_word (wps, rptr, wps->wphdr.block_samples, -1);
    cnt = wps->wphdr.block_samples;
    CLEAR (error);

    if (wps->wphdr.flags & HYBRID_SHAPE) {
      while (cnt--) {
          shaping_weight = (wps->dc.shaping_acc [0] += wps->dc.shaping_delta [0]) >> 16;
          temp = -apply_weight (shaping_weight, error [0]);

          if (new && shaping_weight < 0 && temp) {
            if (temp == error [0])
                temp = (temp < 0) ? temp + 1 : temp - 1;

            lptr [0] += (error [0] = nosend_word (wps, rptr [0], 0) - rptr [0] + temp);
          }
          else
            lptr [0] += (error [0] = nosend_word (wps, rptr [0], 0) - rptr [0]) + temp;

          shaping_weight = (wps->dc.shaping_acc [1] += wps->dc.shaping_delta [1]) >> 16;
          temp = -apply_weight (shaping_weight, error [1]);

          if (new && shaping_weight < 0 && temp) {
            if (temp == error [1])
                temp = (temp < 0) ? temp + 1 : temp - 1;

            lptr [1] += (error [1] = nosend_word (wps, rptr [1], 1) - rptr [1] + temp);
          }
          else
            lptr [1] += (error [1] = nosend_word (wps, rptr [1], 1) - rptr [1]) + temp;

          lptr += 2;
          rptr += 2;
      }

      wps->dc.shaping_acc [0] -= wps->dc.shaping_delta [0] * wps->wphdr.block_samples;
      wps->dc.shaping_acc [1] -= wps->dc.shaping_delta [1] * wps->wphdr.block_samples;
    }
    else
      while (cnt--) {
          lptr [0] += nosend_word (wps, rptr [0], 0) - rptr [0];
          lptr [1] += nosend_word (wps, rptr [1], 1) - rptr [1];
          lptr += 2;
          rptr += 2;
      }
}

void execute_stereo (WavpackContext *wpc, int32_t *samples, int no_history, int do_samples)
{
    int32_t *temp_buffer [2], *best_buffer, *noisy_buffer = NULL, *js_buffer = NULL;
    struct decorr_pass temp_decorr_pass, save_decorr_passes [MAX_NTERMS];
    WavpackStream *wps = wpc->streams [wpc->current_stream];
    int32_t num_samples = wps->wphdr.block_samples;
    int32_t buf_size = sizeof (int32_t) * num_samples * 2;
    uint32_t best_size = (uint32_t) -1, size;
    int log_limit, force_js = 0, force_ts = 0, pi, i;

    for (i = 0; i < num_samples * 2; ++i)
      if (samples [i])
          break;

    if (i == num_samples * 2) {
      wps->wphdr.flags &= ~((uint32_t) JOINT_STEREO);
      CLEAR (wps->decorr_passes);
      wps->num_terms = 0;
      init_words (wps);
      return;
    }

#ifdef LOG_LIMIT
    log_limit = (((wps->wphdr.flags & MAG_MASK) >> MAG_LSB) + 4) * 256;

    if (log_limit > LOG_LIMIT)
      log_limit = LOG_LIMIT;
#else
    log_limit = 0;
#endif

    if (wpc->config.flags & CONFIG_JOINT_OVERRIDE) {
      if (wps->wphdr.flags & JOINT_STEREO)
          force_js = 1;
      else
          force_ts = 1;
    }

    CLEAR (save_decorr_passes);
    temp_buffer [0] = malloc (buf_size);
    temp_buffer [1] = malloc (buf_size);
    best_buffer = malloc (buf_size);

    if (wps->num_passes > 1 && (wps->wphdr.flags & HYBRID_FLAG)) {
      CLEAR (temp_decorr_pass);
      temp_decorr_pass.delta = 2;
      temp_decorr_pass.term = 18;

      decorr_stereo_pass (samples, temp_buffer [0],
          num_samples > 2048 ? 2048 : num_samples, &temp_decorr_pass, -1);

      reverse_decorr (&temp_decorr_pass);
      decorr_stereo_pass (samples, temp_buffer [0], num_samples, &temp_decorr_pass, 1);
      CLEAR (temp_decorr_pass);
      temp_decorr_pass.delta = 2;
      temp_decorr_pass.term = 17;

      decorr_stereo_pass (temp_buffer [0], temp_buffer [1],
          num_samples > 2048 ? 2048 : num_samples, &temp_decorr_pass, -1);

      decorr_stereo_pass (temp_buffer [0], temp_buffer [1], num_samples, &temp_decorr_pass, 1);
      noisy_buffer = malloc (buf_size);
      memcpy (noisy_buffer, samples, buf_size);
      stereo_add_noise (wps, noisy_buffer, temp_buffer [1]);
      no_history = 1;
    }

    if (no_history || wps->num_passes >= 7)
      wps->best_decorr = wps->mask_decorr = 0;

    for (pi = 0; pi < wps->num_passes;) {
      WavpackDecorrSpec *wpds;
      int nterms, c, j;

      if (!pi)
          c = wps->best_decorr;
      else {
          if (wps->mask_decorr == 0)
            c = 0;
          else
            c = (wps->best_decorr & (wps->mask_decorr - 1)) | wps->mask_decorr;

          if (c == wps->best_decorr) {
            wps->mask_decorr = wps->mask_decorr ? ((wps->mask_decorr << 1) & (wps->num_decorrs - 1)) : 1;
            continue;
          }
      }

      wpds = &wps->decorr_specs [c];
        nterms = (int) strlen (wpds->terms);

        while (1) {
            if (force_js || (wpds->joint_stereo && !force_ts)) {
                if (!js_buffer) {
                    int32_t *lptr, cnt = num_samples;

                    lptr = js_buffer = malloc (buf_size);
                    memcpy (js_buffer, noisy_buffer ? noisy_buffer : samples, buf_size);

                    while (cnt--) {
                        lptr [1] += ((lptr [0] -= lptr [1]) >> 1);
                        lptr += 2;
                    }
                }

                memcpy (temp_buffer [0], js_buffer, buf_size);
            }
            else
                memcpy (temp_buffer [0], noisy_buffer ? noisy_buffer : samples, buf_size);

            CLEAR (save_decorr_passes);

            for (j = 0; j < nterms; ++j) {
                CLEAR (temp_decorr_pass);
                temp_decorr_pass.delta = wpds->delta;
                temp_decorr_pass.term = wpds->terms [j];

                if (temp_decorr_pass.term < 0 && !(wps->wphdr.flags & CROSS_DECORR))
                    temp_decorr_pass.term = -3;

                decorr_stereo_pass (temp_buffer [j&1], temp_buffer [~j&1],
                    num_samples > 2048 ? 2048 : num_samples, &temp_decorr_pass, -1);

                if (j) {
                    CLEAR (temp_decorr_pass.samples_A);
                    CLEAR (temp_decorr_pass.samples_B);
                }
                else
                    reverse_decorr (&temp_decorr_pass);

                memcpy (save_decorr_passes + j, &temp_decorr_pass, sizeof (struct decorr_pass));
                decorr_stereo_pass (temp_buffer [j&1], temp_buffer [~j&1], num_samples, &temp_decorr_pass, 1);
            }

            size = log2buffer (temp_buffer [j&1], num_samples * 2, log_limit);

            if (size == (uint32_t) -1 && nterms)
                nterms >>= 1;
            else
                break;
        }

      if (size < best_size) {
          memcpy (best_buffer, temp_buffer [j&1], buf_size);
          memcpy (wps->decorr_passes, save_decorr_passes, sizeof (struct decorr_pass) * MAX_NTERMS);
          wps->num_terms = nterms;
          wps->best_decorr = c;
          best_size = size;
      }

      if (pi++)
          wps->mask_decorr = wps->mask_decorr ? ((wps->mask_decorr << 1) & (wps->num_decorrs - 1)) : 1;
    }

    if (force_js || (wps->decorr_specs [wps->best_decorr].joint_stereo && !force_ts))
      wps->wphdr.flags |= JOINT_STEREO;
    else
      wps->wphdr.flags &= ~((uint32_t) JOINT_STEREO);

    if (wpc->config.xmode > 3) {
      if (wps->wphdr.flags & JOINT_STEREO) {
          analyze_stereo (wpc, js_buffer, do_samples);

          if (do_samples)
            memcpy (samples, js_buffer, buf_size);
      }
      else if (noisy_buffer) {
          analyze_stereo (wpc, noisy_buffer, do_samples);

          if (do_samples)
            memcpy (samples, noisy_buffer, buf_size);
      }
      else
          analyze_stereo (wpc, samples, do_samples);
    }
    else if (do_samples)
      memcpy (samples, best_buffer, buf_size);

    if (wpc->config.xmode > 3 || no_history || wps->joint_stereo != wps->decorr_specs [wps->best_decorr].joint_stereo) {
      wps->joint_stereo = wps->decorr_specs [wps->best_decorr].joint_stereo;
      scan_word (wps, best_buffer, num_samples, -1);
    }

    if (noisy_buffer)
      free (noisy_buffer);

    if (js_buffer)
      free (js_buffer);

    free (temp_buffer [1]);
    free (temp_buffer [0]);
    free (best_buffer);

#ifdef EXTRA_DUMP
    if (1) {
      char string [256], substring [20];
      int i;

      sprintf (string, "%s: terms =",
          (wps->wphdr.flags & JOINT_STEREO) ? "JS" : "TS");

      for (i = 0; i < wps->num_terms; ++i) {
          if (wps->decorr_passes [i].term) {
            if (i && wps->decorr_passes [i-1].delta == wps->decorr_passes [i].delta)
                sprintf (substring, " %d", wps->decorr_passes [i].term);
            else
                sprintf (substring, " %d->%d", wps->decorr_passes [i].term,
                  wps->decorr_passes [i].delta);
          }
          else
            sprintf (substring, " *");

          strcat (string, substring);
      }

      error_line (string);
    }
#endif
}


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