423 lines
16 KiB
C
423 lines
16 KiB
C
|
/* libFLAC - Free Lossless Audio Codec library
|
||
|
|
* Copyright (C) 2000,2001,2002,2003,2004,2005 Josh Coalson
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <math.h>
|
||
|
|
#include "private/bitmath.h"
|
||
|
|
#include "private/fixed.h"
|
||
|
|
#include "FLAC/assert.h"
|
||
|
|
|
||
|
|
#ifndef M_LN2
|
||
|
|
/* math.h in VC++ doesn't seem to have this (how Microsoft is that?) */
|
||
|
|
#define M_LN2 0.69314718055994530942
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef min
|
||
|
|
#undef min
|
||
|
|
#endif
|
||
|
|
#define min(x,y) ((x) < (y)? (x) : (y))
|
||
|
|
|
||
|
|
#ifdef local_abs
|
||
|
|
#undef local_abs
|
||
|
|
#endif
|
||
|
|
#define local_abs(x) ((unsigned)((x)<0? -(x) : (x)))
|
||
|
|
|
||
|
|
#ifdef FLAC__INTEGER_ONLY_LIBRARY
|
||
|
|
/* rbps stands for residual bits per sample
|
||
|
|
*
|
||
|
|
* (ln(2) * err)
|
||
|
|
* rbps = log (-----------)
|
||
|
|
* 2 ( n )
|
||
|
|
*/
|
||
|
|
static FLAC__fixedpoint local__compute_rbps_integerized(FLAC__uint32 err, FLAC__uint32 n)
|
||
|
|
{
|
||
|
|
FLAC__uint32 rbps;
|
||
|
|
unsigned bits; /* the number of bits required to represent a number */
|
||
|
|
int fracbits; /* the number of bits of rbps that comprise the fractional part */
|
||
|
|
|
||
|
|
FLAC__ASSERT(sizeof(rbps) == sizeof(FLAC__fixedpoint));
|
||
|
|
FLAC__ASSERT(err > 0);
|
||
|
|
FLAC__ASSERT(n > 0);
|
||
|
|
|
||
|
|
FLAC__ASSERT(n <= FLAC__MAX_BLOCK_SIZE);
|
||
|
|
if(err <= n)
|
||
|
|
return 0;
|
||
|
|
/*
|
||
|
|
* The above two things tell us 1) n fits in 16 bits; 2) err/n > 1.
|
||
|
|
* These allow us later to know we won't lose too much precision in the
|
||
|
|
* fixed-point division (err<<fracbits)/n.
|
||
|
|
*/
|
||
|
|
|
||
|
|
fracbits = (8*sizeof(err)) - (FLAC__bitmath_ilog2(err)+1);
|
||
|
|
|
||
|
|
err <<= fracbits;
|
||
|
|
err /= n;
|
||
|
|
/* err now holds err/n with fracbits fractional bits */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Whittle err down to 16 bits max. 16 significant bits is enough for
|
||
|
|
* our purposes.
|
||
|
|
*/
|
||
|
|
FLAC__ASSERT(err > 0);
|
||
|
|
bits = FLAC__bitmath_ilog2(err)+1;
|
||
|
|
if(bits > 16) {
|
||
|
|
err >>= (bits-16);
|
||
|
|
fracbits -= (bits-16);
|
||
|
|
}
|
||
|
|
rbps = (FLAC__uint32)err;
|
||
|
|
|
||
|
|
/* Multiply by fixed-point version of ln(2), with 16 fractional bits */
|
||
|
|
rbps *= FLAC__FP_LN2;
|
||
|
|
fracbits += 16;
|
||
|
|
FLAC__ASSERT(fracbits >= 0);
|
||
|
|
|
||
|
|
/* FLAC__fixedpoint_log2 requires fracbits%4 to be 0 */
|
||
|
|
{
|
||
|
|
const int f = fracbits & 3;
|
||
|
|
if(f) {
|
||
|
|
rbps >>= f;
|
||
|
|
fracbits -= f;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
rbps = FLAC__fixedpoint_log2(rbps, fracbits, (unsigned)(-1));
|
||
|
|
|
||
|
|
if(rbps == 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The return value must have 16 fractional bits. Since the whole part
|
||
|
|
* of the base-2 log of a 32 bit number must fit in 5 bits, and fracbits
|
||
|
|
* must be >= -3, these assertion allows us to be able to shift rbps
|
||
|
|
* left if necessary to get 16 fracbits without losing any bits of the
|
||
|
|
* whole part of rbps.
|
||
|
|
*
|
||
|
|
* There is a slight chance due to accumulated error that the whole part
|
||
|
|
* will require 6 bits, so we use 6 in the assertion. Really though as
|
||
|
|
* long as it fits in 13 bits (32 - (16 - (-3))) we are fine.
|
||
|
|
*/
|
||
|
|
FLAC__ASSERT((int)FLAC__bitmath_ilog2(rbps)+1 <= fracbits + 6);
|
||
|
|
FLAC__ASSERT(fracbits >= -3);
|
||
|
|
|
||
|
|
/* now shift the decimal point into place */
|
||
|
|
if(fracbits < 16)
|
||
|
|
return rbps << (16-fracbits);
|
||
|
|
else if(fracbits > 16)
|
||
|
|
return rbps >> (fracbits-16);
|
||
|
|
else
|
||
|
|
return rbps;
|
||
|
|
}
|
||
|
|
|
||
|
|
static FLAC__fixedpoint local__compute_rbps_wide_integerized(FLAC__uint64 err, FLAC__uint32 n)
|
||
|
|
{
|
||
|
|
FLAC__uint32 rbps;
|
||
|
|
unsigned bits; /* the number of bits required to represent a number */
|
||
|
|
int fracbits; /* the number of bits of rbps that comprise the fractional part */
|
||
|
|
|
||
|
|
FLAC__ASSERT(sizeof(rbps) == sizeof(FLAC__fixedpoint));
|
||
|
|
FLAC__ASSERT(err > 0);
|
||
|
|
FLAC__ASSERT(n > 0);
|
||
|
|
|
||
|
|
FLAC__ASSERT(n <= FLAC__MAX_BLOCK_SIZE);
|
||
|
|
if(err <= n)
|
||
|
|
return 0;
|
||
|
|
/*
|
||
|
|
* The above two things tell us 1) n fits in 16 bits; 2) err/n > 1.
|
||
|
|
* These allow us later to know we won't lose too much precision in the
|
||
|
|
* fixed-point division (err<<fracbits)/n.
|
||
|
|
*/
|
||
|
|
|
||
|
|
fracbits = (8*sizeof(err)) - (FLAC__bitmath_ilog2_wide(err)+1);
|
||
|
|
|
||
|
|
err <<= fracbits;
|
||
|
|
err /= n;
|
||
|
|
/* err now holds err/n with fracbits fractional bits */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Whittle err down to 16 bits max. 16 significant bits is enough for
|
||
|
|
* our purposes.
|
||
|
|
*/
|
||
|
|
FLAC__ASSERT(err > 0);
|
||
|
|
bits = FLAC__bitmath_ilog2_wide(err)+1;
|
||
|
|
if(bits > 16) {
|
||
|
|
err >>= (bits-16);
|
||
|
|
fracbits -= (bits-16);
|
||
|
|
}
|
||
|
|
rbps = (FLAC__uint32)err;
|
||
|
|
|
||
|
|
/* Multiply by fixed-point version of ln(2), with 16 fractional bits */
|
||
|
|
rbps *= FLAC__FP_LN2;
|
||
|
|
fracbits += 16;
|
||
|
|
FLAC__ASSERT(fracbits >= 0);
|
||
|
|
|
||
|
|
/* FLAC__fixedpoint_log2 requires fracbits%4 to be 0 */
|
||
|
|
{
|
||
|
|
const int f = fracbits & 3;
|
||
|
|
if(f) {
|
||
|
|
rbps >>= f;
|
||
|
|
fracbits -= f;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
rbps = FLAC__fixedpoint_log2(rbps, fracbits, (unsigned)(-1));
|
||
|
|
|
||
|
|
if(rbps == 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The return value must have 16 fractional bits. Since the whole part
|
||
|
|
* of the base-2 log of a 32 bit number must fit in 5 bits, and fracbits
|
||
|
|
* must be >= -3, these assertion allows us to be able to shift rbps
|
||
|
|
* left if necessary to get 16 fracbits without losing any bits of the
|
||
|
|
* whole part of rbps.
|
||
|
|
*
|
||
|
|
* There is a slight chance due to accumulated error that the whole part
|
||
|
|
* will require 6 bits, so we use 6 in the assertion. Really though as
|
||
|
|
* long as it fits in 13 bits (32 - (16 - (-3))) we are fine.
|
||
|
|
*/
|
||
|
|
FLAC__ASSERT((int)FLAC__bitmath_ilog2(rbps)+1 <= fracbits + 6);
|
||
|
|
FLAC__ASSERT(fracbits >= -3);
|
||
|
|
|
||
|
|
/* now shift the decimal point into place */
|
||
|
|
if(fracbits < 16)
|
||
|
|
return rbps << (16-fracbits);
|
||
|
|
else if(fracbits > 16)
|
||
|
|
return rbps >> (fracbits-16);
|
||
|
|
else
|
||
|
|
return rbps;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef FLAC__INTEGER_ONLY_LIBRARY
|
||
|
|
unsigned FLAC__fixed_compute_best_predictor(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1])
|
||
|
|
#else
|
||
|
|
unsigned FLAC__fixed_compute_best_predictor(const FLAC__int32 data[], unsigned data_len, FLAC__fixedpoint residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1])
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
FLAC__int32 last_error_0 = data[-1];
|
||
|
|
FLAC__int32 last_error_1 = data[-1] - data[-2];
|
||
|
|
FLAC__int32 last_error_2 = last_error_1 - (data[-2] - data[-3]);
|
||
|
|
FLAC__int32 last_error_3 = last_error_2 - (data[-2] - 2*data[-3] + data[-4]);
|
||
|
|
FLAC__int32 error, save;
|
||
|
|
FLAC__uint32 total_error_0 = 0, total_error_1 = 0, total_error_2 = 0, total_error_3 = 0, total_error_4 = 0;
|
||
|
|
unsigned i, order;
|
||
|
|
|
||
|
|
for(i = 0; i < data_len; i++) {
|
||
|
|
error = data[i] ; total_error_0 += local_abs(error); save = error;
|
||
|
|
error -= last_error_0; total_error_1 += local_abs(error); last_error_0 = save; save = error;
|
||
|
|
error -= last_error_1; total_error_2 += local_abs(error); last_error_1 = save; save = error;
|
||
|
|
error -= last_error_2; total_error_3 += local_abs(error); last_error_2 = save; save = error;
|
||
|
|
error -= last_error_3; total_error_4 += local_abs(error); last_error_3 = save;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(total_error_0 < min(min(min(total_error_1, total_error_2), total_error_3), total_error_4))
|
||
|
|
order = 0;
|
||
|
|
else if(total_error_1 < min(min(total_error_2, total_error_3), total_error_4))
|
||
|
|
order = 1;
|
||
|
|
else if(total_error_2 < min(total_error_3, total_error_4))
|
||
|
|
order = 2;
|
||
|
|
else if(total_error_3 < total_error_4)
|
||
|
|
order = 3;
|
||
|
|
else
|
||
|
|
order = 4;
|
||
|
|
|
||
|
|
/* Estimate the expected number of bits per residual signal sample. */
|
||
|
|
/* 'total_error*' is linearly related to the variance of the residual */
|
||
|
|
/* signal, so we use it directly to compute E(|x|) */
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_0 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_1 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_2 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_3 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_4 == 0);
|
||
|
|
#ifndef FLAC__INTEGER_ONLY_LIBRARY
|
||
|
|
residual_bits_per_sample[0] = (FLAC__float)((total_error_0 > 0) ? log(M_LN2 * (FLAC__double)total_error_0 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[1] = (FLAC__float)((total_error_1 > 0) ? log(M_LN2 * (FLAC__double)total_error_1 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[2] = (FLAC__float)((total_error_2 > 0) ? log(M_LN2 * (FLAC__double)total_error_2 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[3] = (FLAC__float)((total_error_3 > 0) ? log(M_LN2 * (FLAC__double)total_error_3 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[4] = (FLAC__float)((total_error_4 > 0) ? log(M_LN2 * (FLAC__double)total_error_4 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
#else
|
||
|
|
residual_bits_per_sample[0] = (total_error_0 > 0) ? local__compute_rbps_integerized(total_error_0, data_len) : 0;
|
||
|
|
residual_bits_per_sample[1] = (total_error_1 > 0) ? local__compute_rbps_integerized(total_error_1, data_len) : 0;
|
||
|
|
residual_bits_per_sample[2] = (total_error_2 > 0) ? local__compute_rbps_integerized(total_error_2, data_len) : 0;
|
||
|
|
residual_bits_per_sample[3] = (total_error_3 > 0) ? local__compute_rbps_integerized(total_error_3, data_len) : 0;
|
||
|
|
residual_bits_per_sample[4] = (total_error_4 > 0) ? local__compute_rbps_integerized(total_error_4, data_len) : 0;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return order;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef FLAC__INTEGER_ONLY_LIBRARY
|
||
|
|
unsigned FLAC__fixed_compute_best_predictor_wide(const FLAC__int32 data[], unsigned data_len, FLAC__float residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1])
|
||
|
|
#else
|
||
|
|
unsigned FLAC__fixed_compute_best_predictor_wide(const FLAC__int32 data[], unsigned data_len, FLAC__fixedpoint residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1])
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
FLAC__int32 last_error_0 = data[-1];
|
||
|
|
FLAC__int32 last_error_1 = data[-1] - data[-2];
|
||
|
|
FLAC__int32 last_error_2 = last_error_1 - (data[-2] - data[-3]);
|
||
|
|
FLAC__int32 last_error_3 = last_error_2 - (data[-2] - 2*data[-3] + data[-4]);
|
||
|
|
FLAC__int32 error, save;
|
||
|
|
/* total_error_* are 64-bits to avoid overflow when encoding
|
||
|
|
* erratic signals when the bits-per-sample and blocksize are
|
||
|
|
* large.
|
||
|
|
*/
|
||
|
|
FLAC__uint64 total_error_0 = 0, total_error_1 = 0, total_error_2 = 0, total_error_3 = 0, total_error_4 = 0;
|
||
|
|
unsigned i, order;
|
||
|
|
|
||
|
|
for(i = 0; i < data_len; i++) {
|
||
|
|
error = data[i] ; total_error_0 += local_abs(error); save = error;
|
||
|
|
error -= last_error_0; total_error_1 += local_abs(error); last_error_0 = save; save = error;
|
||
|
|
error -= last_error_1; total_error_2 += local_abs(error); last_error_1 = save; save = error;
|
||
|
|
error -= last_error_2; total_error_3 += local_abs(error); last_error_2 = save; save = error;
|
||
|
|
error -= last_error_3; total_error_4 += local_abs(error); last_error_3 = save;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(total_error_0 < min(min(min(total_error_1, total_error_2), total_error_3), total_error_4))
|
||
|
|
order = 0;
|
||
|
|
else if(total_error_1 < min(min(total_error_2, total_error_3), total_error_4))
|
||
|
|
order = 1;
|
||
|
|
else if(total_error_2 < min(total_error_3, total_error_4))
|
||
|
|
order = 2;
|
||
|
|
else if(total_error_3 < total_error_4)
|
||
|
|
order = 3;
|
||
|
|
else
|
||
|
|
order = 4;
|
||
|
|
|
||
|
|
/* Estimate the expected number of bits per residual signal sample. */
|
||
|
|
/* 'total_error*' is linearly related to the variance of the residual */
|
||
|
|
/* signal, so we use it directly to compute E(|x|) */
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_0 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_1 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_2 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_3 == 0);
|
||
|
|
FLAC__ASSERT(data_len > 0 || total_error_4 == 0);
|
||
|
|
#ifndef FLAC__INTEGER_ONLY_LIBRARY
|
||
|
|
#if defined _MSC_VER || defined __MINGW32__
|
||
|
|
/* with MSVC you have to spoon feed it the casting */
|
||
|
|
residual_bits_per_sample[0] = (FLAC__float)((total_error_0 > 0) ? log(M_LN2 * (FLAC__double)(FLAC__int64)total_error_0 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[1] = (FLAC__float)((total_error_1 > 0) ? log(M_LN2 * (FLAC__double)(FLAC__int64)total_error_1 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[2] = (FLAC__float)((total_error_2 > 0) ? log(M_LN2 * (FLAC__double)(FLAC__int64)total_error_2 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[3] = (FLAC__float)((total_error_3 > 0) ? log(M_LN2 * (FLAC__double)(FLAC__int64)total_error_3 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[4] = (FLAC__float)((total_error_4 > 0) ? log(M_LN2 * (FLAC__double)(FLAC__int64)total_error_4 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
#else
|
||
|
|
residual_bits_per_sample[0] = (FLAC__float)((total_error_0 > 0) ? log(M_LN2 * (FLAC__double)total_error_0 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[1] = (FLAC__float)((total_error_1 > 0) ? log(M_LN2 * (FLAC__double)total_error_1 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[2] = (FLAC__float)((total_error_2 > 0) ? log(M_LN2 * (FLAC__double)total_error_2 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[3] = (FLAC__float)((total_error_3 > 0) ? log(M_LN2 * (FLAC__double)total_error_3 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
residual_bits_per_sample[4] = (FLAC__float)((total_error_4 > 0) ? log(M_LN2 * (FLAC__double)total_error_4 / (FLAC__double)data_len) / M_LN2 : 0.0);
|
||
|
|
#endif
|
||
|
|
#else
|
||
|
|
residual_bits_per_sample[0] = (total_error_0 > 0) ? local__compute_rbps_wide_integerized(total_error_0, data_len) : 0;
|
||
|
|
residual_bits_per_sample[1] = (total_error_1 > 0) ? local__compute_rbps_wide_integerized(total_error_1, data_len) : 0;
|
||
|
|
residual_bits_per_sample[2] = (total_error_2 > 0) ? local__compute_rbps_wide_integerized(total_error_2, data_len) : 0;
|
||
|
|
residual_bits_per_sample[3] = (total_error_3 > 0) ? local__compute_rbps_wide_integerized(total_error_3, data_len) : 0;
|
||
|
|
residual_bits_per_sample[4] = (total_error_4 > 0) ? local__compute_rbps_wide_integerized(total_error_4, data_len) : 0;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return order;
|
||
|
|
}
|
||
|
|
|
||
|
|
void FLAC__fixed_compute_residual(const FLAC__int32 data[], unsigned data_len, unsigned order, FLAC__int32 residual[])
|
||
|
|
{
|
||
|
|
const int idata_len = (int)data_len;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
switch(order) {
|
||
|
|
case 0:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
residual[i] = data[i];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
residual[i] = data[i] - data[i-1];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
/* == data[i] - 2*data[i-1] + data[i-2] */
|
||
|
|
residual[i] = data[i] - (data[i-1] << 1) + data[i-2];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
/* == data[i] - 3*data[i-1] + 3*data[i-2] - data[i-3] */
|
||
|
|
residual[i] = data[i] - (((data[i-1]-data[i-2])<<1) + (data[i-1]-data[i-2])) - data[i-3];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
/* == data[i] - 4*data[i-1] + 6*data[i-2] - 4*data[i-3] + data[i-4] */
|
||
|
|
residual[i] = data[i] - ((data[i-1]+data[i-3])<<2) + ((data[i-2]<<2) + (data[i-2]<<1)) + data[i-4];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
FLAC__ASSERT(0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void FLAC__fixed_restore_signal(const FLAC__int32 residual[], unsigned data_len, unsigned order, FLAC__int32 data[])
|
||
|
|
{
|
||
|
|
int i, idata_len = (int)data_len;
|
||
|
|
|
||
|
|
switch(order) {
|
||
|
|
case 0:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
data[i] = residual[i];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
data[i] = residual[i] + data[i-1];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
/* == residual[i] + 2*data[i-1] - data[i-2] */
|
||
|
|
data[i] = residual[i] + (data[i-1]<<1) - data[i-2];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
/* residual[i] + 3*data[i-1] - 3*data[i-2]) + data[i-3] */
|
||
|
|
data[i] = residual[i] + (((data[i-1]-data[i-2])<<1) + (data[i-1]-data[i-2])) + data[i-3];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
for(i = 0; i < idata_len; i++) {
|
||
|
|
/* == residual[i] + 4*data[i-1] - 6*data[i-2] + 4*data[i-3] - data[i-4] */
|
||
|
|
data[i] = residual[i] + ((data[i-1]+data[i-3])<<2) - ((data[i-2]<<2) + (data[i-2]<<1)) - data[i-4];
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
FLAC__ASSERT(0);
|
||
|
|
}
|
||
|
|
}
|