1043 lines
40 KiB
C
1043 lines
40 KiB
C
/*
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* AAC coefficients encoder
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* Copyright (C) 2008-2009 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavcodec/aaccoder.c
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* AAC coefficients encoder
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*/
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/***********************************
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* TODOs:
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* speedup quantizer selection
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* add sane pulse detection
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***********************************/
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#include "avcodec.h"
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#include "put_bits.h"
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#include "aac.h"
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#include "aacenc.h"
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#include "aactab.h"
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/** bits needed to code codebook run value for long windows */
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static const uint8_t run_value_bits_long[64] = {
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10,
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
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};
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/** bits needed to code codebook run value for short windows */
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static const uint8_t run_value_bits_short[16] = {
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3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
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};
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static const uint8_t *run_value_bits[2] = {
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run_value_bits_long, run_value_bits_short
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};
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/**
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* Quantize one coefficient.
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* @return absolute value of the quantized coefficient
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* @see 3GPP TS26.403 5.6.2 "Scalefactor determination"
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*/
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static av_always_inline int quant(float coef, const float Q)
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{
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float a = coef * Q;
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return sqrtf(a * sqrtf(a)) + 0.4054;
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}
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static void quantize_bands(int (*out)[2], const float *in, const float *scaled,
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int size, float Q34, int is_signed, int maxval)
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{
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int i;
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double qc;
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for (i = 0; i < size; i++) {
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qc = scaled[i] * Q34;
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out[i][0] = (int)FFMIN(qc, (double)maxval);
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out[i][1] = (int)FFMIN(qc + 0.4054, (double)maxval);
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if (is_signed && in[i] < 0.0f) {
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out[i][0] = -out[i][0];
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out[i][1] = -out[i][1];
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}
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}
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}
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static void abs_pow34_v(float *out, const float *in, const int size)
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{
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#ifndef USE_REALLY_FULL_SEARCH
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int i;
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for (i = 0; i < size; i++) {
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float a = fabsf(in[i]);
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out[i] = sqrtf(a * sqrtf(a));
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}
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#endif /* USE_REALLY_FULL_SEARCH */
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}
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static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
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static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
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/**
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* Calculate rate distortion cost for quantizing with given codebook
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*
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* @return quantization distortion
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*/
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static float quantize_band_cost(struct AACEncContext *s, const float *in,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits)
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{
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const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
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const float Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512];
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const float CLIPPED_ESCAPE = 165140.0f*IQ;
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int i, j, k;
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float cost = 0;
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const int dim = cb < FIRST_PAIR_BT ? 4 : 2;
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int resbits = 0;
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#ifndef USE_REALLY_FULL_SEARCH
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const float Q34 = sqrtf(Q * sqrtf(Q));
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const int range = aac_cb_range[cb];
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const int maxval = aac_cb_maxval[cb];
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int offs[4];
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#endif /* USE_REALLY_FULL_SEARCH */
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if (!cb) {
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for (i = 0; i < size; i++)
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cost += in[i]*in[i];
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if (bits)
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*bits = 0;
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return cost * lambda;
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}
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#ifndef USE_REALLY_FULL_SEARCH
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offs[0] = 1;
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for (i = 1; i < dim; i++)
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offs[i] = offs[i-1]*range;
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quantize_bands(s->qcoefs, in, scaled, size, Q34, !IS_CODEBOOK_UNSIGNED(cb), maxval);
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#endif /* USE_REALLY_FULL_SEARCH */
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for (i = 0; i < size; i += dim) {
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float mincost;
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int minidx = 0;
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int minbits = 0;
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const float *vec;
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#ifndef USE_REALLY_FULL_SEARCH
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int (*quants)[2] = &s->qcoefs[i];
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mincost = 0.0f;
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for (j = 0; j < dim; j++)
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mincost += in[i+j]*in[i+j];
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minidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40;
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minbits = ff_aac_spectral_bits[cb-1][minidx];
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mincost = mincost * lambda + minbits;
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for (j = 0; j < (1<<dim); j++) {
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float rd = 0.0f;
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int curbits;
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int curidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40;
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int same = 0;
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for (k = 0; k < dim; k++) {
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if ((j & (1 << k)) && quants[k][0] == quants[k][1]) {
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same = 1;
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break;
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}
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}
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if (same)
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continue;
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for (k = 0; k < dim; k++)
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curidx += quants[k][!!(j & (1 << k))] * offs[dim - 1 - k];
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curbits = ff_aac_spectral_bits[cb-1][curidx];
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vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
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#else
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mincost = INFINITY;
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vec = ff_aac_codebook_vectors[cb-1];
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for (j = 0; j < ff_aac_spectral_sizes[cb-1]; j++, vec += dim) {
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float rd = 0.0f;
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int curbits = ff_aac_spectral_bits[cb-1][j];
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#endif /* USE_REALLY_FULL_SEARCH */
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if (IS_CODEBOOK_UNSIGNED(cb)) {
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for (k = 0; k < dim; k++) {
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float t = fabsf(in[i+k]);
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float di;
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if (vec[k] == 64.0f) { //FIXME: slow
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//do not code with escape sequence small values
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if (t < 39.0f*IQ) {
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rd = INFINITY;
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break;
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}
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if (t >= CLIPPED_ESCAPE) {
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di = t - CLIPPED_ESCAPE;
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curbits += 21;
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} else {
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int c = av_clip(quant(t, Q), 0, 8191);
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di = t - c*cbrtf(c)*IQ;
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curbits += av_log2(c)*2 - 4 + 1;
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}
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} else {
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di = t - vec[k]*IQ;
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}
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if (vec[k] != 0.0f)
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curbits++;
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rd += di*di;
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}
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} else {
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for (k = 0; k < dim; k++) {
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float di = in[i+k] - vec[k]*IQ;
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rd += di*di;
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}
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}
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rd = rd * lambda + curbits;
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if (rd < mincost) {
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mincost = rd;
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minidx = j;
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minbits = curbits;
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}
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}
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cost += mincost;
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resbits += minbits;
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if (cost >= uplim)
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return uplim;
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}
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if (bits)
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*bits = resbits;
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return cost;
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}
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static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
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const float *in, int size, int scale_idx,
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int cb, const float lambda)
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{
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const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
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const float Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512];
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const float CLIPPED_ESCAPE = 165140.0f*IQ;
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const int dim = (cb < FIRST_PAIR_BT) ? 4 : 2;
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int i, j, k;
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#ifndef USE_REALLY_FULL_SEARCH
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const float Q34 = sqrtf(Q * sqrtf(Q));
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const int range = aac_cb_range[cb];
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const int maxval = aac_cb_maxval[cb];
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int offs[4];
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float *scaled = s->scoefs;
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#endif /* USE_REALLY_FULL_SEARCH */
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//START_TIMER
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if (!cb)
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return;
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#ifndef USE_REALLY_FULL_SEARCH
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offs[0] = 1;
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for (i = 1; i < dim; i++)
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offs[i] = offs[i-1]*range;
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abs_pow34_v(scaled, in, size);
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quantize_bands(s->qcoefs, in, scaled, size, Q34, !IS_CODEBOOK_UNSIGNED(cb), maxval);
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#endif /* USE_REALLY_FULL_SEARCH */
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for (i = 0; i < size; i += dim) {
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float mincost;
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int minidx = 0;
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int minbits = 0;
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const float *vec;
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#ifndef USE_REALLY_FULL_SEARCH
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int (*quants)[2] = &s->qcoefs[i];
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mincost = 0.0f;
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for (j = 0; j < dim; j++)
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mincost += in[i+j]*in[i+j];
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minidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40;
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minbits = ff_aac_spectral_bits[cb-1][minidx];
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mincost = mincost * lambda + minbits;
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for (j = 0; j < (1<<dim); j++) {
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float rd = 0.0f;
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int curbits;
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int curidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40;
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int same = 0;
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for (k = 0; k < dim; k++) {
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if ((j & (1 << k)) && quants[k][0] == quants[k][1]) {
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same = 1;
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break;
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}
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}
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if (same)
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continue;
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for (k = 0; k < dim; k++)
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curidx += quants[k][!!(j & (1 << k))] * offs[dim - 1 - k];
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curbits = ff_aac_spectral_bits[cb-1][curidx];
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vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
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#else
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vec = ff_aac_codebook_vectors[cb-1];
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mincost = INFINITY;
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for (j = 0; j < ff_aac_spectral_sizes[cb-1]; j++, vec += dim) {
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float rd = 0.0f;
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int curbits = ff_aac_spectral_bits[cb-1][j];
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int curidx = j;
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#endif /* USE_REALLY_FULL_SEARCH */
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if (IS_CODEBOOK_UNSIGNED(cb)) {
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for (k = 0; k < dim; k++) {
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float t = fabsf(in[i+k]);
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float di;
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if (vec[k] == 64.0f) { //FIXME: slow
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//do not code with escape sequence small values
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if (t < 39.0f*IQ) {
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rd = INFINITY;
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break;
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}
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if (t >= CLIPPED_ESCAPE) {
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di = t - CLIPPED_ESCAPE;
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curbits += 21;
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} else {
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int c = av_clip(quant(t, Q), 0, 8191);
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di = t - c*cbrtf(c)*IQ;
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curbits += av_log2(c)*2 - 4 + 1;
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}
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} else {
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di = t - vec[k]*IQ;
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}
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if (vec[k] != 0.0f)
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curbits++;
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rd += di*di;
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}
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} else {
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for (k = 0; k < dim; k++) {
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float di = in[i+k] - vec[k]*IQ;
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rd += di*di;
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}
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}
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rd = rd * lambda + curbits;
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if (rd < mincost) {
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mincost = rd;
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minidx = curidx;
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minbits = curbits;
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}
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}
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put_bits(pb, ff_aac_spectral_bits[cb-1][minidx], ff_aac_spectral_codes[cb-1][minidx]);
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if (IS_CODEBOOK_UNSIGNED(cb))
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for (j = 0; j < dim; j++)
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if (ff_aac_codebook_vectors[cb-1][minidx*dim+j] != 0.0f)
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put_bits(pb, 1, in[i+j] < 0.0f);
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if (cb == ESC_BT) {
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for (j = 0; j < 2; j++) {
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if (ff_aac_codebook_vectors[cb-1][minidx*2+j] == 64.0f) {
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int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191);
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int len = av_log2(coef);
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put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
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put_bits(pb, len, coef & ((1 << len) - 1));
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}
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}
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}
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}
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//STOP_TIMER("quantize_and_encode")
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}
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/**
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* structure used in optimal codebook search
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*/
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typedef struct BandCodingPath {
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int prev_idx; ///< pointer to the previous path point
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float cost; ///< path cost
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int run;
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} BandCodingPath;
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/**
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* Encode band info for single window group bands.
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*/
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static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce,
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int win, int group_len, const float lambda)
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{
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BandCodingPath path[120][12];
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int w, swb, cb, start, start2, size;
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int i, j;
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const int max_sfb = sce->ics.max_sfb;
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const int run_bits = sce->ics.num_windows == 1 ? 5 : 3;
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const int run_esc = (1 << run_bits) - 1;
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int idx, ppos, count;
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int stackrun[120], stackcb[120], stack_len;
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float next_minrd = INFINITY;
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int next_mincb = 0;
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abs_pow34_v(s->scoefs, sce->coeffs, 1024);
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start = win*128;
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for (cb = 0; cb < 12; cb++) {
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path[0][cb].cost = 0.0f;
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path[0][cb].prev_idx = -1;
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path[0][cb].run = 0;
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}
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for (swb = 0; swb < max_sfb; swb++) {
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start2 = start;
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size = sce->ics.swb_sizes[swb];
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if (sce->zeroes[win*16 + swb]) {
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for (cb = 0; cb < 12; cb++) {
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path[swb+1][cb].prev_idx = cb;
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path[swb+1][cb].cost = path[swb][cb].cost;
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path[swb+1][cb].run = path[swb][cb].run + 1;
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}
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} else {
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float minrd = next_minrd;
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int mincb = next_mincb;
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next_minrd = INFINITY;
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next_mincb = 0;
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for (cb = 0; cb < 12; cb++) {
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float cost_stay_here, cost_get_here;
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float rd = 0.0f;
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for (w = 0; w < group_len; w++) {
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FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(win+w)*16+swb];
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rd += quantize_band_cost(s, sce->coeffs + start + w*128,
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s->scoefs + start + w*128, size,
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sce->sf_idx[(win+w)*16+swb], cb,
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lambda / band->threshold, INFINITY, NULL);
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}
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cost_stay_here = path[swb][cb].cost + rd;
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cost_get_here = minrd + rd + run_bits + 4;
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if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run]
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!= run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1])
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cost_stay_here += run_bits;
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if (cost_get_here < cost_stay_here) {
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path[swb+1][cb].prev_idx = mincb;
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path[swb+1][cb].cost = cost_get_here;
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path[swb+1][cb].run = 1;
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} else {
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path[swb+1][cb].prev_idx = cb;
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path[swb+1][cb].cost = cost_stay_here;
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path[swb+1][cb].run = path[swb][cb].run + 1;
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}
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if (path[swb+1][cb].cost < next_minrd) {
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next_minrd = path[swb+1][cb].cost;
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next_mincb = cb;
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}
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}
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}
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start += sce->ics.swb_sizes[swb];
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}
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//convert resulting path from backward-linked list
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stack_len = 0;
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idx = 0;
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for (cb = 1; cb < 12; cb++)
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if (path[max_sfb][cb].cost < path[max_sfb][idx].cost)
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idx = cb;
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ppos = max_sfb;
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while (ppos > 0) {
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cb = idx;
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stackrun[stack_len] = path[ppos][cb].run;
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stackcb [stack_len] = cb;
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idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx;
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ppos -= path[ppos][cb].run;
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stack_len++;
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}
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//perform actual band info encoding
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start = 0;
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for (i = stack_len - 1; i >= 0; i--) {
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put_bits(&s->pb, 4, stackcb[i]);
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count = stackrun[i];
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memset(sce->zeroes + win*16 + start, !stackcb[i], count);
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//XXX: memset when band_type is also uint8_t
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for (j = 0; j < count; j++) {
|
|
sce->band_type[win*16 + start] = stackcb[i];
|
|
start++;
|
|
}
|
|
while (count >= run_esc) {
|
|
put_bits(&s->pb, run_bits, run_esc);
|
|
count -= run_esc;
|
|
}
|
|
put_bits(&s->pb, run_bits, count);
|
|
}
|
|
}
|
|
|
|
typedef struct TrellisPath {
|
|
float cost;
|
|
int prev;
|
|
int min_val;
|
|
int max_val;
|
|
} TrellisPath;
|
|
|
|
#define TRELLIS_STAGES 121
|
|
#define TRELLIS_STATES 256
|
|
|
|
static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int q, w, w2, g, start = 0;
|
|
int i, j;
|
|
int idx;
|
|
TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
|
|
int bandaddr[TRELLIS_STAGES];
|
|
int minq;
|
|
float mincost;
|
|
|
|
for (i = 0; i < TRELLIS_STATES; i++) {
|
|
paths[0][i].cost = 0.0f;
|
|
paths[0][i].prev = -1;
|
|
paths[0][i].min_val = i;
|
|
paths[0][i].max_val = i;
|
|
}
|
|
for (j = 1; j < TRELLIS_STAGES; j++) {
|
|
for (i = 0; i < TRELLIS_STATES; i++) {
|
|
paths[j][i].cost = INFINITY;
|
|
paths[j][i].prev = -2;
|
|
paths[j][i].min_val = INT_MAX;
|
|
paths[j][i].max_val = 0;
|
|
}
|
|
}
|
|
idx = 1;
|
|
abs_pow34_v(s->scoefs, sce->coeffs, 1024);
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
const float *coefs = sce->coeffs + start;
|
|
float qmin, qmax;
|
|
int nz = 0;
|
|
|
|
bandaddr[idx] = w * 16 + g;
|
|
qmin = INT_MAX;
|
|
qmax = 0.0f;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
|
|
if (band->energy <= band->threshold || band->threshold == 0.0f) {
|
|
sce->zeroes[(w+w2)*16+g] = 1;
|
|
continue;
|
|
}
|
|
sce->zeroes[(w+w2)*16+g] = 0;
|
|
nz = 1;
|
|
for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
|
|
float t = fabsf(coefs[w2*128+i]);
|
|
if (t > 0.0f)
|
|
qmin = FFMIN(qmin, t);
|
|
qmax = FFMAX(qmax, t);
|
|
}
|
|
}
|
|
if (nz) {
|
|
int minscale, maxscale;
|
|
float minrd = INFINITY;
|
|
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
|
|
minscale = av_clip_uint8(log2(qmin)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
|
|
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero
|
|
maxscale = av_clip_uint8(log2(qmax)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512);
|
|
for (q = minscale; q < maxscale; q++) {
|
|
float dists[12], dist;
|
|
memset(dists, 0, sizeof(dists));
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
|
|
int cb;
|
|
for (cb = 0; cb <= ESC_BT; cb++)
|
|
dists[cb] += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
|
|
q, cb, lambda / band->threshold, INFINITY, NULL);
|
|
}
|
|
dist = dists[0];
|
|
for (i = 1; i <= ESC_BT; i++)
|
|
dist = FFMIN(dist, dists[i]);
|
|
minrd = FFMIN(minrd, dist);
|
|
|
|
for (i = FFMAX(q - SCALE_MAX_DIFF, 0); i < FFMIN(q + SCALE_MAX_DIFF, TRELLIS_STATES); i++) {
|
|
float cost;
|
|
int minv, maxv;
|
|
if (isinf(paths[idx - 1][i].cost))
|
|
continue;
|
|
cost = paths[idx - 1][i].cost + dist
|
|
+ ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
|
|
minv = FFMIN(paths[idx - 1][i].min_val, q);
|
|
maxv = FFMAX(paths[idx - 1][i].max_val, q);
|
|
if (cost < paths[idx][q].cost && maxv-minv < SCALE_MAX_DIFF) {
|
|
paths[idx][q].cost = cost;
|
|
paths[idx][q].prev = i;
|
|
paths[idx][q].min_val = minv;
|
|
paths[idx][q].max_val = maxv;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
for (q = 0; q < TRELLIS_STATES; q++) {
|
|
if (!isinf(paths[idx - 1][q].cost)) {
|
|
paths[idx][q].cost = paths[idx - 1][q].cost + 1;
|
|
paths[idx][q].prev = q;
|
|
paths[idx][q].min_val = FFMIN(paths[idx - 1][q].min_val, q);
|
|
paths[idx][q].max_val = FFMAX(paths[idx - 1][q].max_val, q);
|
|
continue;
|
|
}
|
|
for (i = FFMAX(q - SCALE_MAX_DIFF, 0); i < FFMIN(q + SCALE_MAX_DIFF, TRELLIS_STATES); i++) {
|
|
float cost;
|
|
int minv, maxv;
|
|
if (isinf(paths[idx - 1][i].cost))
|
|
continue;
|
|
cost = paths[idx - 1][i].cost + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
|
|
minv = FFMIN(paths[idx - 1][i].min_val, q);
|
|
maxv = FFMAX(paths[idx - 1][i].max_val, q);
|
|
if (cost < paths[idx][q].cost && maxv-minv < SCALE_MAX_DIFF) {
|
|
paths[idx][q].cost = cost;
|
|
paths[idx][q].prev = i;
|
|
paths[idx][q].min_val = minv;
|
|
paths[idx][q].max_val = maxv;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
sce->zeroes[w*16+g] = !nz;
|
|
start += sce->ics.swb_sizes[g];
|
|
idx++;
|
|
}
|
|
}
|
|
idx--;
|
|
mincost = paths[idx][0].cost;
|
|
minq = 0;
|
|
for (i = 1; i < TRELLIS_STATES; i++) {
|
|
if (paths[idx][i].cost < mincost) {
|
|
mincost = paths[idx][i].cost;
|
|
minq = i;
|
|
}
|
|
}
|
|
while (idx) {
|
|
sce->sf_idx[bandaddr[idx]] = minq;
|
|
minq = paths[idx][minq].prev;
|
|
idx--;
|
|
}
|
|
//set the same quantizers inside window groups
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
|
|
for (g = 0; g < sce->ics.num_swb; g++)
|
|
for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
|
|
sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
|
|
}
|
|
|
|
/**
|
|
* two-loop quantizers search taken from ISO 13818-7 Appendix C
|
|
*/
|
|
static void search_for_quantizers_twoloop(AVCodecContext *avctx,
|
|
AACEncContext *s,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int start = 0, i, w, w2, g;
|
|
int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels;
|
|
float dists[128], uplims[128];
|
|
int fflag, minscaler;
|
|
int its = 0;
|
|
int allz = 0;
|
|
float minthr = INFINITY;
|
|
|
|
//XXX: some heuristic to determine initial quantizers will reduce search time
|
|
memset(dists, 0, sizeof(dists));
|
|
//determine zero bands and upper limits
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
int nz = 0;
|
|
float uplim = 0.0f;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
|
|
uplim += band->threshold;
|
|
if (band->energy <= band->threshold || band->threshold == 0.0f) {
|
|
sce->zeroes[(w+w2)*16+g] = 1;
|
|
continue;
|
|
}
|
|
nz = 1;
|
|
}
|
|
uplims[w*16+g] = uplim *512;
|
|
sce->zeroes[w*16+g] = !nz;
|
|
if (nz)
|
|
minthr = FFMIN(minthr, uplim);
|
|
allz = FFMAX(allz, nz);
|
|
}
|
|
}
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
if (sce->zeroes[w*16+g]) {
|
|
sce->sf_idx[w*16+g] = SCALE_ONE_POS;
|
|
continue;
|
|
}
|
|
sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2(uplims[w*16+g]/minthr)*4,59);
|
|
}
|
|
}
|
|
|
|
if (!allz)
|
|
return;
|
|
abs_pow34_v(s->scoefs, sce->coeffs, 1024);
|
|
//perform two-loop search
|
|
//outer loop - improve quality
|
|
do {
|
|
int tbits, qstep;
|
|
minscaler = sce->sf_idx[0];
|
|
//inner loop - quantize spectrum to fit into given number of bits
|
|
qstep = its ? 1 : 32;
|
|
do {
|
|
int prev = -1;
|
|
tbits = 0;
|
|
fflag = 0;
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
const float *coefs = sce->coeffs + start;
|
|
const float *scaled = s->scoefs + start;
|
|
int bits = 0;
|
|
int cb;
|
|
float mindist = INFINITY;
|
|
int minbits = 0;
|
|
|
|
if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
|
|
start += sce->ics.swb_sizes[g];
|
|
continue;
|
|
}
|
|
minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
|
|
for (cb = 0; cb <= ESC_BT; cb++) {
|
|
float dist = 0.0f;
|
|
int bb = 0;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
int b;
|
|
dist += quantize_band_cost(s, coefs + w2*128,
|
|
scaled + w2*128,
|
|
sce->ics.swb_sizes[g],
|
|
sce->sf_idx[w*16+g],
|
|
cb,
|
|
lambda,
|
|
INFINITY,
|
|
&b);
|
|
bb += b;
|
|
}
|
|
if (dist < mindist) {
|
|
mindist = dist;
|
|
minbits = bb;
|
|
}
|
|
}
|
|
dists[w*16+g] = (mindist - minbits) / lambda;
|
|
bits = minbits;
|
|
if (prev != -1) {
|
|
bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
|
|
}
|
|
tbits += bits;
|
|
start += sce->ics.swb_sizes[g];
|
|
prev = sce->sf_idx[w*16+g];
|
|
}
|
|
}
|
|
if (tbits > destbits) {
|
|
for (i = 0; i < 128; i++)
|
|
if (sce->sf_idx[i] < 218 - qstep)
|
|
sce->sf_idx[i] += qstep;
|
|
} else {
|
|
for (i = 0; i < 128; i++)
|
|
if (sce->sf_idx[i] > 60 - qstep)
|
|
sce->sf_idx[i] -= qstep;
|
|
}
|
|
qstep >>= 1;
|
|
if (!qstep && tbits > destbits*1.02)
|
|
qstep = 1;
|
|
if (sce->sf_idx[0] >= 217)
|
|
break;
|
|
} while (qstep);
|
|
|
|
fflag = 0;
|
|
minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
int prevsc = sce->sf_idx[w*16+g];
|
|
if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60)
|
|
sce->sf_idx[w*16+g]--;
|
|
sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
|
|
sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
|
|
if (sce->sf_idx[w*16+g] != prevsc)
|
|
fflag = 1;
|
|
}
|
|
}
|
|
its++;
|
|
} while (fflag && its < 10);
|
|
}
|
|
|
|
static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int start = 0, i, w, w2, g;
|
|
float uplim[128], maxq[128];
|
|
int minq, maxsf;
|
|
float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
|
|
int last = 0, lastband = 0, curband = 0;
|
|
float avg_energy = 0.0;
|
|
if (sce->ics.num_windows == 1) {
|
|
start = 0;
|
|
for (i = 0; i < 1024; i++) {
|
|
if (i - start >= sce->ics.swb_sizes[curband]) {
|
|
start += sce->ics.swb_sizes[curband];
|
|
curband++;
|
|
}
|
|
if (sce->coeffs[i]) {
|
|
avg_energy += sce->coeffs[i] * sce->coeffs[i];
|
|
last = i;
|
|
lastband = curband;
|
|
}
|
|
}
|
|
} else {
|
|
for (w = 0; w < 8; w++) {
|
|
const float *coeffs = sce->coeffs + w*128;
|
|
start = 0;
|
|
for (i = 0; i < 128; i++) {
|
|
if (i - start >= sce->ics.swb_sizes[curband]) {
|
|
start += sce->ics.swb_sizes[curband];
|
|
curband++;
|
|
}
|
|
if (coeffs[i]) {
|
|
avg_energy += coeffs[i] * coeffs[i];
|
|
last = FFMAX(last, i);
|
|
lastband = FFMAX(lastband, curband);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
last++;
|
|
avg_energy /= last;
|
|
if (avg_energy == 0.0f) {
|
|
for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++)
|
|
sce->sf_idx[i] = SCALE_ONE_POS;
|
|
return;
|
|
}
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
float *coefs = sce->coeffs + start;
|
|
const int size = sce->ics.swb_sizes[g];
|
|
int start2 = start, end2 = start + size, peakpos = start;
|
|
float maxval = -1, thr = 0.0f, t;
|
|
maxq[w*16+g] = 0.0f;
|
|
if (g > lastband) {
|
|
maxq[w*16+g] = 0.0f;
|
|
start += size;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++)
|
|
memset(coefs + w2*128, 0, sizeof(coefs[0])*size);
|
|
continue;
|
|
}
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
for (i = 0; i < size; i++) {
|
|
float t = coefs[w2*128+i]*coefs[w2*128+i];
|
|
maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i]));
|
|
thr += t;
|
|
if (sce->ics.num_windows == 1 && maxval < t) {
|
|
maxval = t;
|
|
peakpos = start+i;
|
|
}
|
|
}
|
|
}
|
|
if (sce->ics.num_windows == 1) {
|
|
start2 = FFMAX(peakpos - 2, start2);
|
|
end2 = FFMIN(peakpos + 3, end2);
|
|
} else {
|
|
start2 -= start;
|
|
end2 -= start;
|
|
}
|
|
start += size;
|
|
thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband);
|
|
t = 1.0 - (1.0 * start2 / last);
|
|
uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075);
|
|
}
|
|
}
|
|
memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
|
|
abs_pow34_v(s->scoefs, sce->coeffs, 1024);
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
const float *coefs = sce->coeffs + start;
|
|
const float *scaled = s->scoefs + start;
|
|
const int size = sce->ics.swb_sizes[g];
|
|
int scf, prev_scf, step;
|
|
int min_scf = 0, max_scf = 255;
|
|
float curdiff;
|
|
if (maxq[w*16+g] < 21.544) {
|
|
sce->zeroes[w*16+g] = 1;
|
|
start += size;
|
|
continue;
|
|
}
|
|
sce->zeroes[w*16+g] = 0;
|
|
scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2(1/maxq[w*16+g])*16/3, 60, 218);
|
|
step = 16;
|
|
for (;;) {
|
|
float dist = 0.0f;
|
|
int quant_max;
|
|
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
int b;
|
|
dist += quantize_band_cost(s, coefs + w2*128,
|
|
scaled + w2*128,
|
|
sce->ics.swb_sizes[g],
|
|
scf,
|
|
ESC_BT,
|
|
lambda,
|
|
INFINITY,
|
|
&b);
|
|
dist -= b;
|
|
}
|
|
dist *= 1.0f / 512.0f / lambda;
|
|
quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[200 - scf + SCALE_ONE_POS - SCALE_DIV_512]);
|
|
if (quant_max >= 8191) { // too much, return to the previous quantizer
|
|
sce->sf_idx[w*16+g] = prev_scf;
|
|
break;
|
|
}
|
|
prev_scf = scf;
|
|
curdiff = fabsf(dist - uplim[w*16+g]);
|
|
if (curdiff == 0.0f)
|
|
step = 0;
|
|
else
|
|
step = fabsf(log2(curdiff));
|
|
if (dist > uplim[w*16+g])
|
|
step = -step;
|
|
if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
|
|
sce->sf_idx[w*16+g] = scf;
|
|
break;
|
|
}
|
|
scf += step;
|
|
if (step > 0)
|
|
min_scf = scf;
|
|
else
|
|
max_scf = scf;
|
|
}
|
|
start += size;
|
|
}
|
|
}
|
|
minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX;
|
|
for (i = 1; i < 128; i++) {
|
|
if (!sce->sf_idx[i])
|
|
sce->sf_idx[i] = sce->sf_idx[i-1];
|
|
else
|
|
minq = FFMIN(minq, sce->sf_idx[i]);
|
|
}
|
|
if (minq == INT_MAX)
|
|
minq = 0;
|
|
minq = FFMIN(minq, SCALE_MAX_POS);
|
|
maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS);
|
|
for (i = 126; i >= 0; i--) {
|
|
if (!sce->sf_idx[i])
|
|
sce->sf_idx[i] = sce->sf_idx[i+1];
|
|
sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf);
|
|
}
|
|
}
|
|
|
|
static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int start = 0, i, w, w2, g;
|
|
int minq = 255;
|
|
|
|
memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
start = w*128;
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g];
|
|
if (band->energy <= band->threshold) {
|
|
sce->sf_idx[(w+w2)*16+g] = 218;
|
|
sce->zeroes[(w+w2)*16+g] = 1;
|
|
} else {
|
|
sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2(band->threshold), 80, 218);
|
|
sce->zeroes[(w+w2)*16+g] = 0;
|
|
}
|
|
minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
|
|
}
|
|
}
|
|
}
|
|
for (i = 0; i < 128; i++) {
|
|
sce->sf_idx[i] = 140;
|
|
//av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
|
|
}
|
|
//set the same quantizers inside window groups
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
|
|
for (g = 0; g < sce->ics.num_swb; g++)
|
|
for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
|
|
sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
|
|
}
|
|
|
|
static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
|
|
const float lambda)
|
|
{
|
|
int start = 0, i, w, w2, g;
|
|
float M[128], S[128];
|
|
float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
|
|
SingleChannelElement *sce0 = &cpe->ch[0];
|
|
SingleChannelElement *sce1 = &cpe->ch[1];
|
|
if (!cpe->common_window)
|
|
return;
|
|
for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
|
|
for (g = 0; g < sce0->ics.num_swb; g++) {
|
|
if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
|
|
float dist1 = 0.0f, dist2 = 0.0f;
|
|
for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band0 = &s->psy.psy_bands[(s->cur_channel+0)*PSY_MAX_BANDS+(w+w2)*16+g];
|
|
FFPsyBand *band1 = &s->psy.psy_bands[(s->cur_channel+1)*PSY_MAX_BANDS+(w+w2)*16+g];
|
|
float minthr = FFMIN(band0->threshold, band1->threshold);
|
|
float maxthr = FFMAX(band0->threshold, band1->threshold);
|
|
for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
|
|
M[i] = (sce0->coeffs[start+w2*128+i]
|
|
+ sce1->coeffs[start+w2*128+i]) * 0.5;
|
|
S[i] = sce0->coeffs[start+w2*128+i]
|
|
- sce1->coeffs[start+w2*128+i];
|
|
}
|
|
abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
|
|
dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128,
|
|
L34,
|
|
sce0->ics.swb_sizes[g],
|
|
sce0->sf_idx[(w+w2)*16+g],
|
|
sce0->band_type[(w+w2)*16+g],
|
|
lambda / band0->threshold, INFINITY, NULL);
|
|
dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128,
|
|
R34,
|
|
sce1->ics.swb_sizes[g],
|
|
sce1->sf_idx[(w+w2)*16+g],
|
|
sce1->band_type[(w+w2)*16+g],
|
|
lambda / band1->threshold, INFINITY, NULL);
|
|
dist2 += quantize_band_cost(s, M,
|
|
M34,
|
|
sce0->ics.swb_sizes[g],
|
|
sce0->sf_idx[(w+w2)*16+g],
|
|
sce0->band_type[(w+w2)*16+g],
|
|
lambda / maxthr, INFINITY, NULL);
|
|
dist2 += quantize_band_cost(s, S,
|
|
S34,
|
|
sce1->ics.swb_sizes[g],
|
|
sce1->sf_idx[(w+w2)*16+g],
|
|
sce1->band_type[(w+w2)*16+g],
|
|
lambda / minthr, INFINITY, NULL);
|
|
}
|
|
cpe->ms_mask[w*16+g] = dist2 < dist1;
|
|
}
|
|
start += sce0->ics.swb_sizes[g];
|
|
}
|
|
}
|
|
}
|
|
|
|
AACCoefficientsEncoder ff_aac_coders[] = {
|
|
{
|
|
search_for_quantizers_faac,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
search_for_ms,
|
|
},
|
|
{
|
|
search_for_quantizers_anmr,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
search_for_ms,
|
|
},
|
|
{
|
|
search_for_quantizers_twoloop,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
search_for_ms,
|
|
},
|
|
{
|
|
search_for_quantizers_fast,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
search_for_ms,
|
|
},
|
|
};
|