284 lines
12 KiB
C
284 lines
12 KiB
C
|
/*
|
||
|
|
* AAC encoder quantizer
|
||
|
|
* Copyright (C) 2015 Rostislav Pehlivanov
|
||
|
|
*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file
|
||
|
|
* AAC encoder quantizer
|
||
|
|
* @author Rostislav Pehlivanov ( atomnuker gmail com )
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef AVCODEC_AACENC_QUANTIZATION_H
|
||
|
|
#define AVCODEC_AACENC_QUANTIZATION_H
|
||
|
|
|
||
|
|
#include "aactab.h"
|
||
|
|
#include "aacenc.h"
|
||
|
|
#include "aacenctab.h"
|
||
|
|
#include "aacenc_utils.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Calculate rate distortion cost for quantizing with given codebook
|
||
|
|
*
|
||
|
|
* @return quantization distortion
|
||
|
|
*/
|
||
|
|
static av_always_inline float quantize_and_encode_band_cost_template(
|
||
|
|
struct AACEncContext *s,
|
||
|
|
PutBitContext *pb, const float *in, float *out,
|
||
|
|
const float *scaled, int size, int scale_idx,
|
||
|
|
int cb, const float lambda, const float uplim,
|
||
|
|
int *bits, float *energy, int BT_ZERO, int BT_UNSIGNED,
|
||
|
|
int BT_PAIR, int BT_ESC, int BT_NOISE, int BT_STEREO,
|
||
|
|
const float ROUNDING)
|
||
|
|
{
|
||
|
|
const int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512;
|
||
|
|
const float Q = ff_aac_pow2sf_tab [q_idx];
|
||
|
|
const float Q34 = ff_aac_pow34sf_tab[q_idx];
|
||
|
|
const float IQ = ff_aac_pow2sf_tab [POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
|
||
|
|
const float CLIPPED_ESCAPE = 165140.0f*IQ;
|
||
|
|
int i, j;
|
||
|
|
float cost = 0;
|
||
|
|
float qenergy = 0;
|
||
|
|
const int dim = BT_PAIR ? 2 : 4;
|
||
|
|
int resbits = 0;
|
||
|
|
int off;
|
||
|
|
|
||
|
|
if (BT_ZERO || BT_NOISE || BT_STEREO) {
|
||
|
|
for (i = 0; i < size; i++)
|
||
|
|
cost += in[i]*in[i];
|
||
|
|
if (bits)
|
||
|
|
*bits = 0;
|
||
|
|
if (energy)
|
||
|
|
*energy = qenergy;
|
||
|
|
if (out) {
|
||
|
|
for (i = 0; i < size; i += dim)
|
||
|
|
for (j = 0; j < dim; j++)
|
||
|
|
out[i+j] = 0.0f;
|
||
|
|
}
|
||
|
|
return cost * lambda;
|
||
|
|
}
|
||
|
|
if (!scaled) {
|
||
|
|
s->abs_pow34(s->scoefs, in, size);
|
||
|
|
scaled = s->scoefs;
|
||
|
|
}
|
||
|
|
s->quant_bands(s->qcoefs, in, scaled, size, !BT_UNSIGNED, aac_cb_maxval[cb], Q34, ROUNDING);
|
||
|
|
if (BT_UNSIGNED) {
|
||
|
|
off = 0;
|
||
|
|
} else {
|
||
|
|
off = aac_cb_maxval[cb];
|
||
|
|
}
|
||
|
|
for (i = 0; i < size; i += dim) {
|
||
|
|
const float *vec;
|
||
|
|
int *quants = s->qcoefs + i;
|
||
|
|
int curidx = 0;
|
||
|
|
int curbits;
|
||
|
|
float quantized, rd = 0.0f;
|
||
|
|
for (j = 0; j < dim; j++) {
|
||
|
|
curidx *= aac_cb_range[cb];
|
||
|
|
curidx += quants[j] + off;
|
||
|
|
}
|
||
|
|
curbits = ff_aac_spectral_bits[cb-1][curidx];
|
||
|
|
vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
|
||
|
|
if (BT_UNSIGNED) {
|
||
|
|
for (j = 0; j < dim; j++) {
|
||
|
|
float t = fabsf(in[i+j]);
|
||
|
|
float di;
|
||
|
|
if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
|
||
|
|
if (t >= CLIPPED_ESCAPE) {
|
||
|
|
quantized = CLIPPED_ESCAPE;
|
||
|
|
curbits += 21;
|
||
|
|
} else {
|
||
|
|
int c = av_clip_uintp2(quant(t, Q, ROUNDING), 13);
|
||
|
|
quantized = c*cbrtf(c)*IQ;
|
||
|
|
curbits += av_log2(c)*2 - 4 + 1;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
quantized = vec[j]*IQ;
|
||
|
|
}
|
||
|
|
di = t - quantized;
|
||
|
|
if (out)
|
||
|
|
out[i+j] = in[i+j] >= 0 ? quantized : -quantized;
|
||
|
|
if (vec[j] != 0.0f)
|
||
|
|
curbits++;
|
||
|
|
qenergy += quantized*quantized;
|
||
|
|
rd += di*di;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
for (j = 0; j < dim; j++) {
|
||
|
|
quantized = vec[j]*IQ;
|
||
|
|
qenergy += quantized*quantized;
|
||
|
|
if (out)
|
||
|
|
out[i+j] = quantized;
|
||
|
|
rd += (in[i+j] - quantized)*(in[i+j] - quantized);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
cost += rd * lambda + curbits;
|
||
|
|
resbits += curbits;
|
||
|
|
if (cost >= uplim)
|
||
|
|
return uplim;
|
||
|
|
if (pb) {
|
||
|
|
put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
|
||
|
|
if (BT_UNSIGNED)
|
||
|
|
for (j = 0; j < dim; j++)
|
||
|
|
if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
|
||
|
|
put_bits(pb, 1, in[i+j] < 0.0f);
|
||
|
|
if (BT_ESC) {
|
||
|
|
for (j = 0; j < 2; j++) {
|
||
|
|
if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
|
||
|
|
int coef = av_clip_uintp2(quant(fabsf(in[i+j]), Q, ROUNDING), 13);
|
||
|
|
int len = av_log2(coef);
|
||
|
|
|
||
|
|
put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
|
||
|
|
put_sbits(pb, len, coef);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (bits)
|
||
|
|
*bits = resbits;
|
||
|
|
if (energy)
|
||
|
|
*energy = qenergy;
|
||
|
|
return cost;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline float quantize_and_encode_band_cost_NONE(struct AACEncContext *s, PutBitContext *pb,
|
||
|
|
const float *in, float *quant, const float *scaled,
|
||
|
|
int size, int scale_idx, int cb,
|
||
|
|
const float lambda, const float uplim,
|
||
|
|
int *bits, float *energy) {
|
||
|
|
av_assert0(0);
|
||
|
|
return 0.0f;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, ROUNDING) \
|
||
|
|
static float quantize_and_encode_band_cost_ ## NAME( \
|
||
|
|
struct AACEncContext *s, \
|
||
|
|
PutBitContext *pb, const float *in, float *quant, \
|
||
|
|
const float *scaled, int size, int scale_idx, \
|
||
|
|
int cb, const float lambda, const float uplim, \
|
||
|
|
int *bits, float *energy) { \
|
||
|
|
return quantize_and_encode_band_cost_template( \
|
||
|
|
s, pb, in, quant, scaled, size, scale_idx, \
|
||
|
|
BT_ESC ? ESC_BT : cb, lambda, uplim, bits, energy, \
|
||
|
|
BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, \
|
||
|
|
ROUNDING); \
|
||
|
|
}
|
||
|
|
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0, 0, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0, 0, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0, 0, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0, 0, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0, 0, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1, 0, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC_RTZ, 0, 1, 1, 1, 0, 0, ROUND_TO_ZERO)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NOISE, 0, 0, 0, 0, 1, 0, ROUND_STANDARD)
|
||
|
|
QUANTIZE_AND_ENCODE_BAND_COST_FUNC(STEREO,0, 0, 0, 0, 0, 1, ROUND_STANDARD)
|
||
|
|
|
||
|
|
static float (*const quantize_and_encode_band_cost_arr[])(
|
||
|
|
struct AACEncContext *s,
|
||
|
|
PutBitContext *pb, const float *in, float *quant,
|
||
|
|
const float *scaled, int size, int scale_idx,
|
||
|
|
int cb, const float lambda, const float uplim,
|
||
|
|
int *bits, float *energy) = {
|
||
|
|
quantize_and_encode_band_cost_ZERO,
|
||
|
|
quantize_and_encode_band_cost_SQUAD,
|
||
|
|
quantize_and_encode_band_cost_SQUAD,
|
||
|
|
quantize_and_encode_band_cost_UQUAD,
|
||
|
|
quantize_and_encode_band_cost_UQUAD,
|
||
|
|
quantize_and_encode_band_cost_SPAIR,
|
||
|
|
quantize_and_encode_band_cost_SPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_ESC,
|
||
|
|
quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
|
||
|
|
quantize_and_encode_band_cost_NOISE,
|
||
|
|
quantize_and_encode_band_cost_STEREO,
|
||
|
|
quantize_and_encode_band_cost_STEREO,
|
||
|
|
};
|
||
|
|
|
||
|
|
static float (*const quantize_and_encode_band_cost_rtz_arr[])(
|
||
|
|
struct AACEncContext *s,
|
||
|
|
PutBitContext *pb, const float *in, float *quant,
|
||
|
|
const float *scaled, int size, int scale_idx,
|
||
|
|
int cb, const float lambda, const float uplim,
|
||
|
|
int *bits, float *energy) = {
|
||
|
|
quantize_and_encode_band_cost_ZERO,
|
||
|
|
quantize_and_encode_band_cost_SQUAD,
|
||
|
|
quantize_and_encode_band_cost_SQUAD,
|
||
|
|
quantize_and_encode_band_cost_UQUAD,
|
||
|
|
quantize_and_encode_band_cost_UQUAD,
|
||
|
|
quantize_and_encode_band_cost_SPAIR,
|
||
|
|
quantize_and_encode_band_cost_SPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_UPAIR,
|
||
|
|
quantize_and_encode_band_cost_ESC_RTZ,
|
||
|
|
quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
|
||
|
|
quantize_and_encode_band_cost_NOISE,
|
||
|
|
quantize_and_encode_band_cost_STEREO,
|
||
|
|
quantize_and_encode_band_cost_STEREO,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define quantize_and_encode_band_cost( \
|
||
|
|
s, pb, in, quant, scaled, size, scale_idx, cb, \
|
||
|
|
lambda, uplim, bits, energy, rtz) \
|
||
|
|
((rtz) ? quantize_and_encode_band_cost_rtz_arr : quantize_and_encode_band_cost_arr)[cb]( \
|
||
|
|
s, pb, in, quant, scaled, size, scale_idx, cb, \
|
||
|
|
lambda, uplim, bits, energy)
|
||
|
|
|
||
|
|
static inline float quantize_band_cost(struct AACEncContext *s, const float *in,
|
||
|
|
const float *scaled, int size, int scale_idx,
|
||
|
|
int cb, const float lambda, const float uplim,
|
||
|
|
int *bits, float *energy, int rtz)
|
||
|
|
{
|
||
|
|
return quantize_and_encode_band_cost(s, NULL, in, NULL, scaled, size, scale_idx,
|
||
|
|
cb, lambda, uplim, bits, energy, rtz);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int quantize_band_cost_bits(struct AACEncContext *s, const float *in,
|
||
|
|
const float *scaled, int size, int scale_idx,
|
||
|
|
int cb, const float lambda, const float uplim,
|
||
|
|
int *bits, float *energy, int rtz)
|
||
|
|
{
|
||
|
|
int auxbits;
|
||
|
|
quantize_and_encode_band_cost(s, NULL, in, NULL, scaled, size, scale_idx,
|
||
|
|
cb, 0.0f, uplim, &auxbits, energy, rtz);
|
||
|
|
if (bits) {
|
||
|
|
*bits = auxbits;
|
||
|
|
}
|
||
|
|
return auxbits;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
|
||
|
|
const float *in, float *out, int size, int scale_idx,
|
||
|
|
int cb, const float lambda, int rtz)
|
||
|
|
{
|
||
|
|
quantize_and_encode_band_cost(s, pb, in, out, NULL, size, scale_idx, cb, lambda,
|
||
|
|
INFINITY, NULL, NULL, rtz);
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "aacenc_quantization_misc.h"
|
||
|
|
|
||
|
|
#endif /* AVCODEC_AACENC_QUANTIZATION_H */
|