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8df9bf8e39
This patch refactors the AAC coders to reuse code between the MIPS port and the regular, portable C code. There were two main functions that had to use hand-optimized versions of quantization code: - search_for_quantizers_twoloop - codebook_trellis_rate Those two were split into their own template header files so they can be inlined inside both the MIPS port and the generic code. In each context, they'll link to their specialized implementations, and thus be optimized by the compiler. This approach I believe is better than maintaining several copies of each function. As past experience has proven, having to keep those in sync was error prone. In this way, they will remain in sync by default. Also, an implementation of the dequantized output argument for the optimized quantize_and_encode functions is included in the patch. While the current implementation of search_for_pred still isn't using it, future iterations of main prediction probably will. It should not imply any measurable performance hit while not being used.
798 lines
32 KiB
C
798 lines
32 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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#include "libavcodec/aaccoder_twoloop.h"
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/** Frequency in Hz for lower limit of noise substitution **/
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#define NOISE_LOW_LIMIT 4000
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/* Parameter of f(x) = a*(lambda/100), defines the maximum fourier spread
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* beyond which no PNS is used (since the SFBs contain tone rather than noise) */
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#define NOISE_SPREAD_THRESHOLD 0.5073f
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/* Parameter of f(x) = a*(100/lambda), defines how much PNS is allowed to
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* replace low energy non zero bands */
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#define NOISE_LAMBDA_REPLACE 1.948f
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#include "libavcodec/aaccoder_trellis.h"
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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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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(roundf(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(3+ceilf(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++) {
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paths[0][i].cost = 0.0f;
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paths[0][i].prev = -1;
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}
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for (j = 1; j < TRELLIS_STAGES; j++) {
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for (i = 0; i < TRELLIS_STATES; i++) {
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paths[j][i].cost = INFINITY;
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paths[j][i].prev = -2;
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}
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}
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idx = 1;
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abs_pow34_v(s->scoefs, sce->coeffs, 1024);
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for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
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start = w*128;
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for (g = 0; g < sce->ics.num_swb; g++) {
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const float *coefs = &sce->coeffs[start];
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float qmin, qmax;
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int nz = 0;
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bandaddr[idx] = w * 16 + g;
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qmin = INT_MAX;
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qmax = 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].psy_bands[(w+w2)*16+g];
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if (band->energy <= band->threshold || band->threshold == 0.0f) {
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sce->zeroes[(w+w2)*16+g] = 1;
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continue;
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}
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sce->zeroes[(w+w2)*16+g] = 0;
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nz = 1;
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for (i = 0; i < sce->ics.swb_sizes[g]; i++) {
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float t = fabsf(coefs[w2*128+i]);
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if (t > 0.0f)
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qmin = FFMIN(qmin, t);
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qmax = FFMAX(qmax, t);
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}
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}
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if (nz) {
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int minscale, maxscale;
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float minrd = INFINITY;
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float maxval;
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//minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped
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minscale = coef2minsf(qmin);
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//maximum scalefactor index is when maximum coefficient after quantizing is still not zero
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maxscale = coef2maxsf(qmax);
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minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1);
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maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES);
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maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start);
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for (q = minscale; q < maxscale; q++) {
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float dist = 0;
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int cb = find_min_book(maxval, sce->sf_idx[w*16+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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dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g],
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q + q0, cb, lambda / band->threshold, INFINITY, NULL, 0);
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}
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minrd = FFMIN(minrd, dist);
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for (i = 0; i < q1 - q0; i++) {
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float cost;
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cost = paths[idx - 1][i].cost + dist
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+ ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO];
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if (cost < paths[idx][q].cost) {
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paths[idx][q].cost = cost;
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paths[idx][q].prev = i;
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}
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}
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}
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} else {
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for (q = 0; q < q1 - q0; q++) {
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paths[idx][q].cost = paths[idx - 1][q].cost + 1;
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paths[idx][q].prev = q;
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}
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}
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sce->zeroes[w*16+g] = !nz;
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start += sce->ics.swb_sizes[g];
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idx++;
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}
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}
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idx--;
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mincost = paths[idx][0].cost;
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minq = 0;
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for (i = 1; i < TRELLIS_STATES; i++) {
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if (paths[idx][i].cost < mincost) {
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mincost = paths[idx][i].cost;
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minq = i;
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}
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}
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while (idx) {
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sce->sf_idx[bandaddr[idx]] = minq + q0;
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minq = paths[idx][minq].prev;
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idx--;
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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_quantizers_faac(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 start = 0, i, w, w2, g;
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float uplim[128], maxq[128];
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int minq, maxsf;
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float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda;
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int last = 0, lastband = 0, curband = 0;
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float avg_energy = 0.0;
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if (sce->ics.num_windows == 1) {
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start = 0;
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for (i = 0; i < 1024; i++) {
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if (i - start >= sce->ics.swb_sizes[curband]) {
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start += sce->ics.swb_sizes[curband];
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curband++;
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}
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if (sce->coeffs[i]) {
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avg_energy += sce->coeffs[i] * sce->coeffs[i];
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last = i;
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lastband = curband;
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}
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}
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} else {
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for (w = 0; w < 8; w++) {
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const float *coeffs = &sce->coeffs[w*128];
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curband = start = 0;
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for (i = 0; i < 128; i++) {
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if (i - start >= sce->ics.swb_sizes[curband]) {
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start += sce->ics.swb_sizes[curband];
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|
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,
|
|
SingleChannelElement *sce,
|
|
const float lambda)
|
|
{
|
|
int 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]) {
|
|
for (g = 0; g < sce->ics.num_swb; 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];
|
|
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 + log2f(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_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
|
|
{
|
|
FFPsyBand *band;
|
|
int w, g, w2, i;
|
|
float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];
|
|
float *NOR34 = &s->scoefs[3*128];
|
|
const float lambda = s->lambda;
|
|
const float freq_mult = avctx->sample_rate/(1024.0f/sce->ics.num_windows)/2.0f;
|
|
const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
|
|
const float spread_threshold = NOISE_SPREAD_THRESHOLD*(lambda/100.f);
|
|
|
|
if (sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE)
|
|
return;
|
|
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
int noise_sfi;
|
|
float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
|
|
float pns_energy = 0.0f, energy_ratio, dist_thresh;
|
|
float sfb_energy = 0.0f, threshold = 0.0f, spread = 0.0f;
|
|
const int start = sce->ics.swb_offset[w*16+g];
|
|
const float freq = start*freq_mult;
|
|
const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
|
|
if (freq < NOISE_LOW_LIMIT || avctx->cutoff && freq >= avctx->cutoff)
|
|
continue;
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
sfb_energy += band->energy;
|
|
spread += band->spread;
|
|
threshold += band->threshold;
|
|
}
|
|
|
|
/* Ramps down at ~8000Hz and loosens the dist threshold */
|
|
dist_thresh = FFMIN(2.5f*NOISE_LOW_LIMIT/freq, 1.27f);
|
|
|
|
if (sce->zeroes[w*16+g] || spread < spread_threshold ||
|
|
sfb_energy > threshold*thr_mult*freq_boost) {
|
|
sce->pns_ener[w*16+g] = sfb_energy;
|
|
continue;
|
|
}
|
|
|
|
noise_sfi = av_clip(roundf(log2f(sfb_energy)*2), -100, 155); /* Quantize */
|
|
noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO]; /* Dequantize */
|
|
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
|
|
float band_energy, scale;
|
|
const int start_c = sce->ics.swb_offset[(w+w2)*16+g];
|
|
band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
|
|
for (i = 0; i < sce->ics.swb_sizes[g]; i++)
|
|
PNS[i] = s->random_state = lcg_random(s->random_state);
|
|
band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
|
|
scale = noise_amp/sqrtf(band_energy);
|
|
s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);
|
|
pns_energy += s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
|
|
abs_pow34_v(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);
|
|
abs_pow34_v(PNS34, PNS, sce->ics.swb_sizes[g]);
|
|
dist1 += quantize_band_cost(s, &sce->coeffs[start_c],
|
|
NOR34,
|
|
sce->ics.swb_sizes[g],
|
|
sce->sf_idx[(w+w2)*16+g],
|
|
sce->band_alt[(w+w2)*16+g],
|
|
lambda/band->threshold, INFINITY, NULL, 0);
|
|
dist2 += quantize_band_cost(s, PNS,
|
|
PNS34,
|
|
sce->ics.swb_sizes[g],
|
|
noise_sfi,
|
|
NOISE_BT,
|
|
lambda/band->threshold, INFINITY, NULL, 0);
|
|
}
|
|
energy_ratio = sfb_energy/pns_energy; /* Compensates for quantization error */
|
|
sce->pns_ener[w*16+g] = energy_ratio*sfb_energy;
|
|
if (energy_ratio > 0.85f && energy_ratio < 1.25f && dist1/dist2 > dist_thresh) {
|
|
sce->band_type[w*16+g] = NOISE_BT;
|
|
sce->zeroes[w*16+g] = 0;
|
|
if (sce->band_type[w*16+g-1] != NOISE_BT && /* Prevent holes */
|
|
sce->band_type[w*16+g-2] == NOISE_BT) {
|
|
sce->band_type[w*16+g-1] = NOISE_BT;
|
|
sce->zeroes[w*16+g-1] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
|
|
{
|
|
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;
|
|
const float lambda = s->lambda;
|
|
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]) {
|
|
start = 0;
|
|
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.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
|
|
FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_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+(w+w2)*128+i]
|
|
+ sce1->coeffs[start+(w+w2)*128+i]) * 0.5;
|
|
S[i] = M[i]
|
|
- sce1->coeffs[start+(w+w2)*128+i];
|
|
}
|
|
abs_pow34_v(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);
|
|
abs_pow34_v(R34, sce1->coeffs+start+(w+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 + (w+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, 0);
|
|
dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+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, 0);
|
|
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, 0);
|
|
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, 0);
|
|
}
|
|
cpe->ms_mask[w*16+g] = dist2 < dist1;
|
|
}
|
|
start += sce0->ics.swb_sizes[g];
|
|
}
|
|
}
|
|
}
|
|
|
|
AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {
|
|
[AAC_CODER_FAAC] = {
|
|
search_for_quantizers_faac,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_prediction,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
ff_aac_search_for_tns,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
[AAC_CODER_ANMR] = {
|
|
search_for_quantizers_anmr,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_prediction,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
ff_aac_search_for_tns,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
[AAC_CODER_TWOLOOP] = {
|
|
search_for_quantizers_twoloop,
|
|
codebook_trellis_rate,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_prediction,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
ff_aac_search_for_tns,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
[AAC_CODER_FAST] = {
|
|
search_for_quantizers_fast,
|
|
encode_window_bands_info,
|
|
quantize_and_encode_band,
|
|
ff_aac_encode_tns_info,
|
|
ff_aac_encode_main_pred,
|
|
ff_aac_adjust_common_prediction,
|
|
ff_aac_apply_main_pred,
|
|
ff_aac_apply_tns,
|
|
set_special_band_scalefactors,
|
|
search_for_pns,
|
|
ff_aac_search_for_tns,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
};
|