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////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2005 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.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;
extern const signed char default_terms [], high_terms [], fast_terms [];
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)
continue;
if (term == 17 && branches == 1 && depth + 1 < info->nterms)
continue;
if (term == -1 || term == -2)
if (!(wps->wphdr.flags & CROSS_DECORR))
continue;
if (term >= 9 && term <= 16)
if (term > MAX_TERM || !(wpc->config.flags & CONFIG_HIGH_FLAG) || (wpc->config.extra_flags & EXTRA_SKIP_8TO16))
continue;
if ((wpc->config.flags & CONFIG_FAST_FLAG) && (term >= 5 && term <= 16))
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;
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);
}
}
}
}
#define EXTRA_ADVANCED (EXTRA_BRANCHES | EXTRA_SORT_FIRST | EXTRA_SORT_LAST | EXTRA_TRY_DELTAS)
void analyze_stereo (WavpackContext *wpc, int32_t *samples)
{
WavpackStream *wps = wpc->streams [wpc->current_stream];
#ifdef EXTRA_DUMP
uint32_t bits, default_bits, cnt;
#else
uint32_t bits, cnt;
#endif
const signed char *decorr_terms = default_terms, *tp;
WavpackExtraInfo info;
int32_t *lptr;
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
CLEAR (wps->decorr_passes);
cnt = wps->wphdr.block_samples * 2;
lptr = samples;
while (cnt--)
if (*lptr++)
break;
if (cnt == (uint32_t) -1) {
scan_word (wps, samples, wps->wphdr.block_samples, -1);
wps->num_terms = 0;
return;
}
if (wpc->config.flags & CONFIG_HIGH_FLAG)
decorr_terms = high_terms;
else if (wpc->config.flags & CONFIG_FAST_FLAG)
decorr_terms = fast_terms;
info.nterms = strlen (decorr_terms);
if (wpc->config.extra_flags & EXTRA_TERMS)
if ((info.nterms += (wpc->config.extra_flags & EXTRA_TERMS) >> 10) > MAX_NTERMS)
info.nterms = MAX_NTERMS;
for (i = 0; i < info.nterms + 2; ++i)
info.sampleptrs [i] = malloc (wps->wphdr.block_samples * 8);
memcpy (info.sampleptrs [info.nterms + 1], samples, wps->wphdr.block_samples * 8);
info.best_bits = log2buffer (info.sampleptrs [info.nterms + 1], wps->wphdr.block_samples * 2, 0);
if ((wpc->config.extra_flags & EXTRA_STEREO_MODES) || !(wps->wphdr.flags & JOINT_STEREO)) {
memcpy (info.sampleptrs [0], samples, wps->wphdr.block_samples * 8);
CLEAR (info.dps);
for (tp = decorr_terms, i = 0; *tp;) {
if (*tp > 0 || (wps->wphdr.flags & CROSS_DECORR))
info.dps [i].term = *tp++;
else {
info.dps [i].term = -3;
tp++;
}
info.dps [i].delta = 2;
decorr_stereo_buffer (info.sampleptrs [i], info.sampleptrs [i+1], wps->wphdr.block_samples, info.dps, i);
++i;
}
#ifdef EXTRA_DUMP
default_bits = bits = log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0);
#else
bits = log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0);
#endif
wps->wphdr.flags &= ~JOINT_STEREO;
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);
}
}
if ((wpc->config.extra_flags & EXTRA_STEREO_MODES) || (wps->wphdr.flags & JOINT_STEREO)) {
memcpy (info.sampleptrs [0], samples, wps->wphdr.block_samples * 8);
cnt = wps->wphdr.block_samples;
lptr = info.sampleptrs [0];
while (cnt--) {
lptr [1] += ((lptr [0] -= lptr [1]) >> 1);
lptr += 2;
}
CLEAR (info.dps);
for (tp = decorr_terms, i = 0; *tp;) {
if (*tp > 0 || (wps->wphdr.flags & CROSS_DECORR))
info.dps [i].term = *tp++;
else {
info.dps [i].term = -3;
tp++;
}
info.dps [i].delta = 2;
decorr_stereo_buffer (info.sampleptrs [i], info.sampleptrs [i+1], wps->wphdr.block_samples, info.dps, i);
++i;
}
#ifdef EXTRA_DUMP
default_bits = bits = log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0);
#else
bits = log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0);
#endif
wps->wphdr.flags |= JOINT_STEREO;
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 {
memcpy (info.sampleptrs [0], samples, wps->wphdr.block_samples * 8);
wps->wphdr.flags &= ~JOINT_STEREO;
}
}
if ((wps->wphdr.flags & HYBRID_FLAG) && (wpc->config.extra_flags & EXTRA_ADVANCED)) {
int shaping_weight, new = wps->wphdr.flags & NEW_SHAPING;
int32_t *rptr = info.sampleptrs [info.nterms + 1], error [2], temp;
scan_word (wps, rptr, wps->wphdr.block_samples, -1);
cnt = wps->wphdr.block_samples;
lptr = info.sampleptrs [0];
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;
}
memcpy (info.dps, wps->decorr_passes, sizeof (info.dps));
for (i = 0; i < info.nterms && info.dps [i].term; ++i)
decorr_stereo_buffer (info.sampleptrs [i], info.sampleptrs [i + 1], wps->wphdr.block_samples, info.dps, i);
#ifdef EXTRA_DUMP
info.best_bits = default_bits = log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0);
#else
info.best_bits = log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0);
#endif
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);
}
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 = (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 0
memcpy (info.dps, wps->decorr_passes, sizeof (info.dps));
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);
if (log2buffer (info.sampleptrs [i], wps->wphdr.block_samples * 2, 0) != info.best_bits)
error_line ("(1) samples do not match!");
if (log2buffer (info.sampleptrs [info.nterms + 1], wps->wphdr.block_samples * 2, 0) != info.best_bits)
error_line ("(2) samples do not match!");
#endif
scan_word (wps, info.sampleptrs [info.nterms + 1], wps->wphdr.block_samples, -1);
#ifdef EXTRA_DUMP
if (1) {
char string [256], substring [20];
int i;
sprintf (string, "%s: delta = %.4f%%, terms =",
(wps->wphdr.flags & JOINT_STEREO) ? "JS" : "TS",
((double) info.best_bits - default_bits) / 256.0 / wps->wphdr.block_samples / 32.0 * 100.0);
for (i = 0; i < info.nterms; ++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
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]);
}
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