mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-15 19:39:05 +02:00
44ddee945a
This commit completely alters the algorithm of prediction. The original commit which introduced prediction was completely incorrect to even remotely care about what the actual coefficients contain or whether any options were enabled. Not my actual fault. This commit treats prediction the way the decoder does and expects to do: like lossy encryption. Everything related to prediction now happens at the very end but just before quantization and encoding of coefficients. On the decoder side, prediction happens before anything has had a chance to even access the coefficients. Also the original implementation had problems because it actually touched the band_type of special bands which already had their scalefactor indices marked and it's a wonder the asserion wasn't triggered when transmitting those. Overall, this now drastically increases audio quality and you should think about enabling it if you don't plan on playing anything encoded on really old low power ultra-embedded devices since they might not support decoding of prediction or AAC-Main. Though the specifications were written ages ago and as times change so do the FLOPS. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
1020 lines
40 KiB
C
1020 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
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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 "libavutil/libm.h" // brought forward to work around cygwin header breakage
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#include <float.h>
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#include "libavutil/mathematics.h"
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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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#include "aacenctab.h"
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#include "aacenc_utils.h"
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#include "aacenc_quantization.h"
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#include "aac_tablegen_decl.h"
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#include "aacenc_is.h"
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#include "aacenc_tns.h"
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#include "aacenc_pred.h"
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/** Frequency in Hz for lower limit of noise substitution **/
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#define NOISE_LOW_LIMIT 4500
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/* Energy spread threshold value below which no PNS is used, this corresponds to
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* typically around 17Khz, after which PNS usage decays ending at 19Khz */
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#define NOISE_SPREAD_THRESHOLD 0.5f
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/* This constant gets divided by lambda to return ~1.65 which when multiplied
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* by the band->threshold and compared to band->energy is the boundary between
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* excessive PNS and little PNS usage. */
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#define NOISE_LAMBDA_NUMERATOR 252.1f
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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][CB_TOT_ALL];
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int w, swb, cb, start, 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 < CB_TOT_ALL; 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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size = sce->ics.swb_sizes[swb];
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if (sce->zeroes[win*16 + swb]) {
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for (cb = 0; cb < CB_TOT_ALL; 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 < CB_TOT_ALL; cb++) {
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float cost_stay_here, cost_get_here;
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float rd = 0.0f;
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if (cb >= 12 && sce->band_type[win*16+swb] < aac_cb_out_map[cb] ||
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cb < aac_cb_in_map[sce->band_type[win*16+swb]] && sce->band_type[win*16+swb] > aac_cb_out_map[cb]) {
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path[swb+1][cb].prev_idx = -1;
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path[swb+1][cb].cost = INFINITY;
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path[swb+1][cb].run = path[swb][cb].run + 1;
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continue;
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}
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for (w = 0; w < group_len; w++) {
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FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_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], aac_cb_out_map[cb],
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lambda / band->threshold, INFINITY, NULL, 0);
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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 < CB_TOT_ALL; 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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av_assert1(idx >= 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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cb = aac_cb_out_map[stackcb[i]];
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put_bits(&s->pb, 4, cb);
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count = stackrun[i];
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memset(sce->zeroes + win*16 + start, !cb, count);
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//XXX: memset when band_type is also uint8_t
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for (j = 0; j < count; j++) {
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sce->band_type[win*16 + start] = cb;
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start++;
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}
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while (count >= run_esc) {
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put_bits(&s->pb, run_bits, run_esc);
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count -= run_esc;
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}
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put_bits(&s->pb, run_bits, count);
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}
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}
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static void codebook_trellis_rate(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][CB_TOT_ALL];
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int w, swb, cb, start, 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_minbits = 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 < CB_TOT_ALL; cb++) {
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path[0][cb].cost = run_bits+4;
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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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size = sce->ics.swb_sizes[swb];
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if (sce->zeroes[win*16 + swb]) {
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float cost_stay_here = path[swb][0].cost;
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float cost_get_here = next_minbits + run_bits + 4;
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if ( run_value_bits[sce->ics.num_windows == 8][path[swb][0].run]
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!= run_value_bits[sce->ics.num_windows == 8][path[swb][0].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][0].prev_idx = next_mincb;
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path[swb+1][0].cost = cost_get_here;
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path[swb+1][0].run = 1;
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} else {
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path[swb+1][0].prev_idx = 0;
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path[swb+1][0].cost = cost_stay_here;
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path[swb+1][0].run = path[swb][0].run + 1;
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}
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next_minbits = path[swb+1][0].cost;
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next_mincb = 0;
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for (cb = 1; cb < CB_TOT_ALL; cb++) {
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path[swb+1][cb].cost = 61450;
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path[swb+1][cb].prev_idx = -1;
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path[swb+1][cb].run = 0;
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}
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} else {
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float minbits = next_minbits;
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int mincb = next_mincb;
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int startcb = sce->band_type[win*16+swb];
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startcb = aac_cb_in_map[startcb];
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next_minbits = INFINITY;
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next_mincb = 0;
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for (cb = 0; cb < startcb; cb++) {
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path[swb+1][cb].cost = 61450;
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path[swb+1][cb].prev_idx = -1;
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path[swb+1][cb].run = 0;
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}
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for (cb = startcb; cb < CB_TOT_ALL; cb++) {
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float cost_stay_here, cost_get_here;
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float bits = 0.0f;
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if (cb >= 12 && sce->band_type[win*16+swb] != aac_cb_out_map[cb]) {
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path[swb+1][cb].cost = 61450;
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path[swb+1][cb].prev_idx = -1;
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path[swb+1][cb].run = 0;
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continue;
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}
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for (w = 0; w < group_len; w++) {
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bits += 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*16+swb],
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aac_cb_out_map[cb],
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0, INFINITY, NULL, 0);
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}
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cost_stay_here = path[swb][cb].cost + bits;
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cost_get_here = minbits + bits + 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_minbits) {
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next_minbits = 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 < CB_TOT_ALL; 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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av_assert1(idx >= 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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cb = aac_cb_out_map[stackcb[i]];
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put_bits(&s->pb, 4, cb);
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count = stackrun[i];
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memset(sce->zeroes + win*16 + start, !cb, count);
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//XXX: memset when band_type is also uint8_t
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for (j = 0; j < count; j++) {
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sce->band_type[win*16 + start] = cb;
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start++;
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}
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while (count >= run_esc) {
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put_bits(&s->pb, run_bits, run_esc);
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count -= run_esc;
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}
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put_bits(&s->pb, run_bits, count);
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}
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}
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typedef struct TrellisPath {
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float cost;
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int prev;
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} TrellisPath;
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#define TRELLIS_STAGES 121
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#define TRELLIS_STATES (SCALE_MAX_DIFF+1)
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static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce)
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{
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int w, g, start = 0;
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int minscaler_n = sce->sf_idx[0], minscaler_i = sce->sf_idx[0];
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int bands = 0;
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
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start = 0;
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for (g = 0; g < sce->ics.num_swb; g++) {
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if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
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sce->sf_idx[w*16+g] = av_clip(ceilf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
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minscaler_i = FFMIN(minscaler_i, sce->sf_idx[w*16+g]);
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bands++;
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} else if (sce->band_type[w*16+g] == NOISE_BT) {
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sce->sf_idx[w*16+g] = av_clip(4+log2f(sce->pns_ener[w*16+g])*2, -100, 155);
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minscaler_n = FFMIN(minscaler_n, sce->sf_idx[w*16+g]);
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bands++;
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}
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start += sce->ics.swb_sizes[g];
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}
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}
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if (!bands)
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return;
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/* Clip the scalefactor indices */
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
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for (g = 0; g < sce->ics.num_swb; g++) {
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if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
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sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_i, minscaler_i + SCALE_MAX_DIFF);
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} else if (sce->band_type[w*16+g] == NOISE_BT) {
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sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_n, minscaler_n + SCALE_MAX_DIFF);
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}
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}
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}
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}
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static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
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SingleChannelElement *sce,
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const float lambda)
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{
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int q, w, w2, g, start = 0;
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int i, j;
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int idx;
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TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES];
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int bandaddr[TRELLIS_STAGES];
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int minq;
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float mincost;
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float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f;
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int q0, q1, qcnt = 0;
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for (i = 0; i < 1024; i++) {
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float t = fabsf(sce->coeffs[i]);
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if (t > 0.0f) {
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q0f = FFMIN(q0f, t);
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q1f = FFMAX(q1f, t);
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qnrgf += t*t;
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qcnt++;
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}
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}
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if (!qcnt) {
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memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
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memset(sce->zeroes, 1, sizeof(sce->zeroes));
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return;
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}
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//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
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q0 = coef2minsf(q0f);
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//maximum scalefactor index is when maximum coefficient after quantizing is still not zero
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q1 = coef2maxsf(q1f);
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if (q1 - q0 > 60) {
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int q0low = q0;
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int q1high = q1;
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//minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
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int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
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q1 = qnrg + 30;
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q0 = qnrg - 30;
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if (q0 < q0low) {
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q1 += q0low - q0;
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q0 = q0low;
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} else if (q1 > q1high) {
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q0 -= q1 - q1high;
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q1 = q1high;
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}
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}
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|
|
for (i = 0; i < TRELLIS_STATES; i++) {
|
|
paths[0][i].cost = 0.0f;
|
|
paths[0][i].prev = -1;
|
|
}
|
|
for (j = 1; j < TRELLIS_STAGES; j++) {
|
|
for (i = 0; i < TRELLIS_STATES; i++) {
|
|
paths[j][i].cost = INFINITY;
|
|
paths[j][i].prev = -2;
|
|
}
|
|
}
|
|
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.ch[s->cur_channel].psy_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;
|
|
float maxval;
|
|
//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
|
|
minscale = coef2minsf(qmin);
|
|
//maximum scalefactor index is when maximum coefficient after quantizing is still not zero
|
|
maxscale = coef2maxsf(qmax);
|
|
minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
|
|
maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
|
|
maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
|
|
for (q = minscale; q < maxscale; q++) {
|
|
float dist = 0;
|
|
int cb = find_min_book(maxval, sce->sf_idx[w*16+g]);
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
|
|
q + q0, cb, lambda / band->threshold, INFINITY, NULL, 0);
|
|
}
|
|
minrd = FFMIN(minrd, dist);
|
|
|
|
for (i = 0; i < q1 - q0; i++) {
|
|
float cost;
|
|
cost = paths[idx - 1][i].cost + dist
|
|
+ ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
|
|
if (cost < paths[idx][q].cost) {
|
|
paths[idx][q].cost = cost;
|
|
paths[idx][q].prev = i;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
for (q = 0; q < q1 - q0; q++) {
|
|
paths[idx][q].cost = paths[idx - 1][q].cost + 1;
|
|
paths[idx][q].prev = q;
|
|
}
|
|
}
|
|
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 + q0;
|
|
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 * (lambda / 120.f);
|
|
float dists[128] = { 0 }, uplims[128] = { 0 };
|
|
float maxvals[128];
|
|
int fflag, minscaler;
|
|
int its = 0;
|
|
int allz = 0;
|
|
float minthr = INFINITY;
|
|
|
|
// for values above this the decoder might end up in an endless loop
|
|
// due to always having more bits than what can be encoded.
|
|
destbits = FFMIN(destbits, 5800);
|
|
//XXX: some heuristic to determine initial quantizers will reduce search time
|
|
//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, energy = 0.0f;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
uplim += band->threshold;
|
|
energy += band->energy;
|
|
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 |= 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(log2f(uplims[w*16+g]/minthr)*4,59);
|
|
}
|
|
}
|
|
|
|
if (!allz)
|
|
return;
|
|
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 *scaled = s->scoefs + start;
|
|
maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
|
|
start += sce->ics.swb_sizes[g];
|
|
}
|
|
}
|
|
|
|
//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;
|
|
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 dist = 0.0f;
|
|
|
|
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]);
|
|
cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
|
|
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,
|
|
1.0f,
|
|
INFINITY,
|
|
&b,
|
|
0);
|
|
bits += b;
|
|
}
|
|
dists[w*16+g] = dist - bits;
|
|
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 && sce->sf_idx[0] < 217)
|
|
qstep = 1;
|
|
} 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]) {
|
|
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) {
|
|
if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
|
|
sce->sf_idx[w*16+g]--;
|
|
else //Try to make sure there is some energy in every band
|
|
sce->sf_idx[w*16+g]-=2;
|
|
}
|
|
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;
|
|
sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
|
|
}
|
|
}
|
|
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];
|
|
curband = 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 = -1, max_scf = 256;
|
|
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 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
|
|
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,
|
|
0);
|
|
dist -= b;
|
|
}
|
|
dist *= 1.0f / 512.0f / lambda;
|
|
quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512], ROUND_STANDARD);
|
|
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 <= 1.0f)
|
|
step = 0;
|
|
else
|
|
step = log2f(curdiff);
|
|
if (dist > uplim[w*16+g])
|
|
step = -step;
|
|
scf += step;
|
|
scf = av_clip_uint8(scf);
|
|
step = scf - prev_scf;
|
|
if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) {
|
|
sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf);
|
|
break;
|
|
}
|
|
if (step > 0)
|
|
min_scf = prev_scf;
|
|
else
|
|
max_scf = prev_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,
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SingleChannelElement *sce,
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const float lambda)
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{
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int i, w, w2, g;
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int minq = 255;
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memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
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for (g = 0; g < sce->ics.num_swb; g++) {
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for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
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FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
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if (band->energy <= band->threshold) {
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sce->sf_idx[(w+w2)*16+g] = 218;
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sce->zeroes[(w+w2)*16+g] = 1;
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} else {
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sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
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sce->zeroes[(w+w2)*16+g] = 0;
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}
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minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
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}
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}
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}
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for (i = 0; i < 128; i++) {
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sce->sf_idx[i] = 140;
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//av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
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}
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//set the same quantizers inside window groups
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
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for (g = 0; g < sce->ics.num_swb; g++)
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for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
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sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
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}
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static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
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{
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int start = 0, w, w2, g;
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const float lambda = s->lambda;
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const float freq_mult = avctx->sample_rate/(1024.0f/sce->ics.num_windows)/2.0f;
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const float spread_threshold = NOISE_SPREAD_THRESHOLD*(lambda/120.f);
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const float thr_mult = NOISE_LAMBDA_NUMERATOR/lambda;
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
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start = 0;
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for (g = 0; g < sce->ics.num_swb; g++) {
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if (start*freq_mult > NOISE_LOW_LIMIT*(lambda/170.0f)) {
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float energy = 0.0f, threshold = 0.0f, spread = 0.0f;
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for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
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FFPsyBand *band = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
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energy += band->energy;
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threshold += band->threshold;
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spread += band->spread;
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}
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if (spread > spread_threshold*sce->ics.group_len[w] &&
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((sce->zeroes[w*16+g] && energy >= threshold) ||
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energy < threshold*thr_mult*sce->ics.group_len[w])) {
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sce->band_type[w*16+g] = NOISE_BT;
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sce->pns_ener[w*16+g] = energy / sce->ics.group_len[w];
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sce->zeroes[w*16+g] = 0;
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}
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}
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start += sce->ics.swb_sizes[g];
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}
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}
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}
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static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
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{
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int start = 0, i, w, w2, g;
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float M[128], S[128];
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float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3;
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const float lambda = s->lambda;
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SingleChannelElement *sce0 = &cpe->ch[0];
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SingleChannelElement *sce1 = &cpe->ch[1];
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if (!cpe->common_window)
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return;
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for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
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start = 0;
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for (g = 0; g < sce0->ics.num_swb; g++) {
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if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
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float dist1 = 0.0f, dist2 = 0.0f;
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for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
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FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
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FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
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float minthr = FFMIN(band0->threshold, band1->threshold);
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float maxthr = FFMAX(band0->threshold, band1->threshold);
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for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
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M[i] = (sce0->coeffs[start+(w+w2)*128+i]
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+ sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
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S[i] = M[i]
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- sce1->coeffs[start+(w+w2)*128+i];
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}
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abs_pow34_v(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
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abs_pow34_v(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
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abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]);
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abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]);
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dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],
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L34,
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sce0->ics.swb_sizes[g],
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sce0->sf_idx[(w+w2)*16+g],
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sce0->band_type[(w+w2)*16+g],
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lambda / band0->threshold, INFINITY, NULL, 0);
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dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
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R34,
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sce1->ics.swb_sizes[g],
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sce1->sf_idx[(w+w2)*16+g],
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sce1->band_type[(w+w2)*16+g],
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lambda / band1->threshold, INFINITY, NULL, 0);
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dist2 += quantize_band_cost(s, M,
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M34,
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sce0->ics.swb_sizes[g],
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sce0->sf_idx[(w+w2)*16+g],
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sce0->band_type[(w+w2)*16+g],
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lambda / maxthr, INFINITY, NULL, 0);
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dist2 += quantize_band_cost(s, S,
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S34,
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sce1->ics.swb_sizes[g],
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sce1->sf_idx[(w+w2)*16+g],
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sce1->band_type[(w+w2)*16+g],
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lambda / minthr, INFINITY, NULL, 0);
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}
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cpe->ms_mask[w*16+g] = dist2 < dist1;
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}
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start += sce0->ics.swb_sizes[g];
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}
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}
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}
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AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
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[AAC_CODER_FAAC] = {
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search_for_quantizers_faac,
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encode_window_bands_info,
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quantize_and_encode_band,
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ff_aac_encode_tns_info,
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ff_aac_encode_main_pred,
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ff_aac_adjust_common_prediction,
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ff_aac_apply_main_pred,
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set_special_band_scalefactors,
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search_for_pns,
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ff_aac_search_for_tns,
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search_for_ms,
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ff_aac_search_for_is,
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ff_aac_search_for_pred,
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},
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[AAC_CODER_ANMR] = {
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search_for_quantizers_anmr,
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encode_window_bands_info,
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quantize_and_encode_band,
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ff_aac_encode_tns_info,
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ff_aac_encode_main_pred,
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ff_aac_adjust_common_prediction,
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ff_aac_apply_main_pred,
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set_special_band_scalefactors,
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search_for_pns,
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ff_aac_search_for_tns,
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search_for_ms,
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ff_aac_search_for_is,
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ff_aac_search_for_pred,
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},
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[AAC_CODER_TWOLOOP] = {
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search_for_quantizers_twoloop,
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codebook_trellis_rate,
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quantize_and_encode_band,
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ff_aac_encode_tns_info,
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ff_aac_encode_main_pred,
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ff_aac_adjust_common_prediction,
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ff_aac_apply_main_pred,
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set_special_band_scalefactors,
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|
search_for_pns,
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ff_aac_search_for_tns,
|
|
search_for_ms,
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ff_aac_search_for_is,
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ff_aac_search_for_pred,
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},
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[AAC_CODER_FAST] = {
|
|
search_for_quantizers_fast,
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encode_window_bands_info,
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quantize_and_encode_band,
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|
ff_aac_encode_tns_info,
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|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_prediction,
|
|
ff_aac_apply_main_pred,
|
|
set_special_band_scalefactors,
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|
search_for_pns,
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|
ff_aac_search_for_tns,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
};
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