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01ecb7172b
This finalizes merging of the work in the patches in ticket #2686. Improvements to twoloop and RC logic are extensive. The non-exhaustive list of twoloop improvments includes: - Tweaks to distortion limits on the RD optimization phase of twoloop - Deeper search in twoloop - PNS information marking to let twoloop decide when to use it (turned out having the decision made separately wasn't working) - Tonal band detection and priorization - Better band energy conservation rules - Strict hole avoidance For rate control: - Use psymodel's bit allocation to allow proper use of the bit reservoir. Don't work against the bit reservoir by moving lambda in the opposite direction when psymodel decides to allocate more/less bits to a frame. - Retry the encode if the effective rate lies outside a reasonable margin of psymodel's allocation or the selected ABR. - Log average lambda at the end. Useful info for everyone, but especially for tuning of the various encoder constants that relate to lambda feedback. Psy: - Do not apply lowpass with a FIR filter, instead just let the coder zero bands above the cutoff. The FIR filter induces group delay, and while zeroing bands causes ripple, it's lost in the quantization noise. - Experimental VBR bit allocation code - Tweak automatic lowpass filter threshold to maximize audio bandwidth at all bitrates while still providing acceptable, stable quality. I/S: - Phase decision fixes. Unrelated to #2686, but the bugs only surfaced when the merge was finalized. Measure I/S band energy accounting for phase, and prevent I/S and M/S from being applied both. PNS: - Avoid marking short bands with PNS when they're part of a window group in which there's a large variation of energy from one window to the next. PNS can't preserve those and the effect is extremely noticeable. M/S: - Implement BMLD protection similar to the specified in ISO-IEC/13818:7-2003, Appendix C Section 6.1. Since M/S decision doesn't conform to section 6.1, a different method had to be implemented, but should provide equivalent protection. - Move the decision logic closer to the method specified in ISO-IEC/13818:7-2003, Appendix C Section 6.1. Specifically, make sure M/S needs less bits than dual stereo. - Don't apply M/S in bands that are using I/S Now, this of course needed adjustments in the compare targets and fuzz factors of the AAC encoder's fate tests, but if wondering why the targets go up (more distortion), consider the previous coder was using too many bits on LF content (far more than required by psy), and thus those signals will now be more distorted, not less. The extra distortion isn't audible though, I carried extensive ABX testing to make sure. A very similar patch was also extensively tested by Kamendo2 in the context of #2686.
978 lines
40 KiB
C
978 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 "mathops.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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/* 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, 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, 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;
|
|
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, NULL,
|
|
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;
|
|
int wlen = 1024 / sce->ics.num_windows;
|
|
int bandwidth, cutoff;
|
|
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*0.5f/wlen;
|
|
const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);
|
|
const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
|
|
const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);
|
|
const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
|
|
|
|
int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
|
|
/ ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
|
|
* (lambda / 120.f);
|
|
|
|
/** Keep this in sync with twoloop's cutoff selection */
|
|
float rate_bandwidth_multiplier = 1.5f;
|
|
int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
|
|
? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
|
|
: (avctx->bit_rate / avctx->channels);
|
|
|
|
frame_bit_rate *= 1.15f;
|
|
|
|
if (avctx->cutoff > 0) {
|
|
bandwidth = avctx->cutoff;
|
|
} else {
|
|
bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
|
|
}
|
|
|
|
cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
|
|
|
|
memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
int wstart = w*128;
|
|
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, pns_tgt_energy, energy_ratio, dist_thresh;
|
|
float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
|
|
float min_energy = -1.0f, max_energy = 0.0f;
|
|
const int start = wstart+sce->ics.swb_offset[g];
|
|
const float freq = (start-wstart)*freq_mult;
|
|
const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);
|
|
if (freq < NOISE_LOW_LIMIT || (start-wstart) >= 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 = FFMIN(spread, band->spread);
|
|
threshold += band->threshold;
|
|
if (!w2) {
|
|
min_energy = max_energy = band->energy;
|
|
} else {
|
|
min_energy = FFMIN(min_energy, band->energy);
|
|
max_energy = FFMAX(max_energy, band->energy);
|
|
}
|
|
}
|
|
|
|
/* Ramps down at ~8000Hz and loosens the dist threshold */
|
|
dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;
|
|
|
|
/* PNS is acceptable when all of these are true:
|
|
* 1. high spread energy (noise-like band)
|
|
* 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
|
|
* 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
|
|
*
|
|
* At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)
|
|
*/
|
|
if (((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.5f/freq_boost)) || spread < spread_threshold ||
|
|
(!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||
|
|
min_energy < pns_transient_energy_r * max_energy ) {
|
|
sce->pns_ener[w*16+g] = sfb_energy;
|
|
continue;
|
|
}
|
|
|
|
pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);
|
|
noise_sfi = av_clip(roundf(log2f(pns_tgt_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, pns_senergy;
|
|
const int start_c = (w+w2)*128+sce->ics.swb_offset[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_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);
|
|
pns_energy += pns_senergy;
|
|
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, NULL, 0);
|
|
/* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */
|
|
dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;
|
|
}
|
|
if (g && sce->sf_idx[(w+w2)*16+g-1] == NOISE_BT) {
|
|
dist2 += 5;
|
|
} else {
|
|
dist2 += 9;
|
|
}
|
|
energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */
|
|
sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;
|
|
if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {
|
|
sce->band_type[w*16+g] = NOISE_BT;
|
|
sce->zeroes[w*16+g] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
|
|
{
|
|
FFPsyBand *band;
|
|
int w, g, w2;
|
|
int wlen = 1024 / sce->ics.num_windows;
|
|
int bandwidth, cutoff;
|
|
const float lambda = s->lambda;
|
|
const float freq_mult = avctx->sample_rate*0.5f/wlen;
|
|
const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));
|
|
const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);
|
|
|
|
int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate
|
|
/ ((avctx->flags & CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)
|
|
* (lambda / 120.f);
|
|
|
|
/** Keep this in sync with twoloop's cutoff selection */
|
|
float rate_bandwidth_multiplier = 1.5f;
|
|
int frame_bit_rate = (avctx->flags & CODEC_FLAG_QSCALE)
|
|
? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)
|
|
: (avctx->bit_rate / avctx->channels);
|
|
|
|
frame_bit_rate *= 1.15f;
|
|
|
|
if (avctx->cutoff > 0) {
|
|
bandwidth = avctx->cutoff;
|
|
} else {
|
|
bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));
|
|
}
|
|
|
|
cutoff = bandwidth * 2 * wlen / avctx->sample_rate;
|
|
|
|
memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
|
|
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
|
|
for (g = 0; g < sce->ics.num_swb; g++) {
|
|
float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
|
|
float min_energy = -1.0f, max_energy = 0.0f;
|
|
const int start = sce->ics.swb_offset[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 || start >= cutoff) {
|
|
sce->can_pns[w*16+g] = 0;
|
|
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 = FFMIN(spread, band->spread);
|
|
threshold += band->threshold;
|
|
if (!w2) {
|
|
min_energy = max_energy = band->energy;
|
|
} else {
|
|
min_energy = FFMIN(min_energy, band->energy);
|
|
max_energy = FFMAX(max_energy, band->energy);
|
|
}
|
|
}
|
|
|
|
/* PNS is acceptable when all of these are true:
|
|
* 1. high spread energy (noise-like band)
|
|
* 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)
|
|
* 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)
|
|
*/
|
|
sce->pns_ener[w*16+g] = sfb_energy;
|
|
if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {
|
|
sce->can_pns[w*16+g] = 0;
|
|
} else {
|
|
sce->can_pns[w*16+g] = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
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{
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int start = 0, i, w, w2, g, sid_sf_boost;
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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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const float mslambda = FFMIN(1.0f, lambda / 120.f);
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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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int min_sf_idx_mid = SCALE_MAX_POS;
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int min_sf_idx_side = SCALE_MAX_POS;
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for (g = 0; g < sce0->ics.num_swb; g++) {
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if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)
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min_sf_idx_mid = FFMIN(min_sf_idx_mid, sce0->sf_idx[w*16+g]);
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if (!sce1->zeroes[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)
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min_sf_idx_side = FFMIN(min_sf_idx_side, sce1->sf_idx[w*16+g]);
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}
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|
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start = 0;
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for (g = 0; g < sce0->ics.num_swb; g++) {
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float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
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cpe->ms_mask[w*16+g] = 0;
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if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) {
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float Mmax = 0.0f, Smax = 0.0f;
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|
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/* Must compute mid/side SF and book for the whole window group */
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for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
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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(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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for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {
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Mmax = FFMAX(Mmax, M34[i]);
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Smax = FFMAX(Smax, S34[i]);
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}
|
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}
|
|
|
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for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
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float dist1 = 0.0f, dist2 = 0.0f;
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int B0 = 0, B1 = 0;
|
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int minidx;
|
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int mididx, sididx;
|
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int midcb, sidcb;
|
|
|
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minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);
|
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mididx = av_clip(minidx, min_sf_idx_mid, min_sf_idx_mid + SCALE_MAX_DIFF);
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sididx = av_clip(minidx - sid_sf_boost * 3, min_sf_idx_side, min_sf_idx_side + SCALE_MAX_DIFF);
|
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midcb = find_min_book(Mmax, mididx);
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sidcb = find_min_book(Smax, sididx);
|
|
|
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if ((mididx > minidx) || (sididx > minidx)) {
|
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/* scalefactor range violation, bad stuff, will decrease quality unacceptably */
|
|
continue;
|
|
}
|
|
|
|
/* No CB can be zero */
|
|
midcb = FFMAX(1,midcb);
|
|
sidcb = FFMAX(1,sidcb);
|
|
|
|
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);
|
|
int b1,b2,b3,b4;
|
|
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, &b1, 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, &b2, 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 / minthr, INFINITY, &b3, 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],
|
|
mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
|
|
B0 += b1+b2;
|
|
B1 += b3+b4;
|
|
dist1 -= B0;
|
|
dist2 -= B1;
|
|
}
|
|
cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
|
|
if (cpe->ms_mask[w*16+g]) {
|
|
/* Setting the M/S mask is useful with I/S, but only the flag */
|
|
if (!cpe->is_mask[w*16+g]) {
|
|
sce0->sf_idx[w*16+g] = mididx;
|
|
sce1->sf_idx[w*16+g] = sididx;
|
|
sce0->band_type[w*16+g] = midcb;
|
|
sce1->band_type[w*16+g] = sidcb;
|
|
}
|
|
break;
|
|
} else if (B1 > B0) {
|
|
/* More boost won't fix this */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
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,
|
|
mark_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,
|
|
mark_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,
|
|
mark_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,
|
|
mark_pns,
|
|
ff_aac_search_for_tns,
|
|
search_for_ms,
|
|
ff_aac_search_for_is,
|
|
ff_aac_search_for_pred,
|
|
},
|
|
};
|