LCOV - code coverage report
Current view: top level - src/libavcodec - aacenc_is.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 93 93 100.0 %
Date: 2017-01-24 04:42:20 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * AAC encoder intensity stereo
       3             :  * Copyright (C) 2015 Rostislav Pehlivanov
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * AAC encoder Intensity Stereo
      25             :  * @author Rostislav Pehlivanov ( atomnuker gmail com )
      26             :  */
      27             : 
      28             : #include "aacenc.h"
      29             : #include "aacenc_utils.h"
      30             : #include "aacenc_is.h"
      31             : #include "aacenc_quantization.h"
      32             : 
      33       21226 : struct AACISError ff_aac_is_encoding_err(AACEncContext *s, ChannelElement *cpe,
      34             :                                          int start, int w, int g, float ener0,
      35             :                                          float ener1, float ener01,
      36             :                                          int use_pcoeffs, int phase)
      37             : {
      38             :     int i, w2;
      39       21226 :     SingleChannelElement *sce0 = &cpe->ch[0];
      40       21226 :     SingleChannelElement *sce1 = &cpe->ch[1];
      41       21226 :     float *L = use_pcoeffs ? sce0->pcoeffs : sce0->coeffs;
      42       21226 :     float *R = use_pcoeffs ? sce1->pcoeffs : sce1->coeffs;
      43       21226 :     float *L34 = &s->scoefs[256*0], *R34 = &s->scoefs[256*1];
      44       21226 :     float *IS  = &s->scoefs[256*2], *I34 = &s->scoefs[256*3];
      45       21226 :     float dist1 = 0.0f, dist2 = 0.0f;
      46       21226 :     struct AACISError is_error = {0};
      47             : 
      48       21226 :     if (ener01 <= 0 || ener0 <= 0) {
      49         458 :         is_error.pass = 0;
      50         458 :         return is_error;
      51             :     }
      52             : 
      53       41702 :     for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
      54       20934 :         FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
      55       20934 :         FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
      56       20934 :         int is_band_type, is_sf_idx = FFMAX(1, sce0->sf_idx[w*16+g]-4);
      57       20934 :         float e01_34 = phase*pos_pow34(ener1/ener0);
      58       20934 :         float maxval, dist_spec_err = 0.0f;
      59       20934 :         float minthr = FFMIN(band0->threshold, band1->threshold);
      60      691514 :         for (i = 0; i < sce0->ics.swb_sizes[g]; i++)
      61      670580 :             IS[i] = (L[start+(w+w2)*128+i] + phase*R[start+(w+w2)*128+i])*sqrt(ener0/ener01);
      62       20934 :         s->abs_pow34(L34, &L[start+(w+w2)*128], sce0->ics.swb_sizes[g]);
      63       20934 :         s->abs_pow34(R34, &R[start+(w+w2)*128], sce0->ics.swb_sizes[g]);
      64       20934 :         s->abs_pow34(I34, IS,                   sce0->ics.swb_sizes[g]);
      65       20934 :         maxval = find_max_val(1, sce0->ics.swb_sizes[g], I34);
      66       20934 :         is_band_type = find_min_book(maxval, is_sf_idx);
      67       83736 :         dist1 += quantize_band_cost(s, &L[start + (w+w2)*128], L34,
      68       20934 :                                     sce0->ics.swb_sizes[g],
      69       20934 :                                     sce0->sf_idx[w*16+g],
      70       20934 :                                     sce0->band_type[w*16+g],
      71       20934 :                                     s->lambda / band0->threshold, INFINITY, NULL, NULL, 0);
      72       83736 :         dist1 += quantize_band_cost(s, &R[start + (w+w2)*128], R34,
      73       20934 :                                     sce1->ics.swb_sizes[g],
      74       20934 :                                     sce1->sf_idx[w*16+g],
      75       20934 :                                     sce1->band_type[w*16+g],
      76       20934 :                                     s->lambda / band1->threshold, INFINITY, NULL, NULL, 0);
      77       20934 :         dist2 += quantize_band_cost(s, IS, I34, sce0->ics.swb_sizes[g],
      78             :                                     is_sf_idx, is_band_type,
      79       20934 :                                     s->lambda / minthr, INFINITY, NULL, NULL, 0);
      80      691514 :         for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
      81      670580 :             dist_spec_err += (L34[i] - I34[i])*(L34[i] - I34[i]);
      82      670580 :             dist_spec_err += (R34[i] - I34[i]*e01_34)*(R34[i] - I34[i]*e01_34);
      83             :         }
      84       20934 :         dist_spec_err *= s->lambda / minthr;
      85       20934 :         dist2 += dist_spec_err;
      86             :     }
      87             : 
      88       20768 :     is_error.pass = dist2 <= dist1;
      89       20768 :     is_error.phase = phase;
      90       20768 :     is_error.error = dist2 - dist1;
      91       20768 :     is_error.dist1 = dist1;
      92       20768 :     is_error.dist2 = dist2;
      93       20768 :     is_error.ener01 = ener01;
      94             : 
      95       20768 :     return is_error;
      96             : }
      97             : 
      98        1243 : void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe)
      99             : {
     100        1243 :     SingleChannelElement *sce0 = &cpe->ch[0];
     101        1243 :     SingleChannelElement *sce1 = &cpe->ch[1];
     102        1243 :     int start = 0, count = 0, w, w2, g, i, prev_sf1 = -1, prev_bt = -1, prev_is = 0;
     103        1243 :     const float freq_mult = avctx->sample_rate/(1024.0f/sce0->ics.num_windows)/2.0f;
     104             :     uint8_t nextband1[128];
     105             : 
     106        1243 :     if (!cpe->common_window)
     107         652 :         return;
     108             : 
     109             :     /** Scout out next nonzero bands */
     110         591 :     ff_init_nextband_map(sce1, nextband1);
     111             : 
     112        1216 :     for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
     113         625 :         start = 0;
     114       29570 :         for (g = 0;  g < sce0->ics.num_swb; g++) {
     115       39551 :             if (start*freq_mult > INT_STEREO_LOW_LIMIT*(s->lambda/170.0f) &&
     116       29067 :                 cpe->ch[0].band_type[w*16+g] != NOISE_BT && !cpe->ch[0].zeroes[w*16+g] &&
     117       25677 :                 cpe->ch[1].band_type[w*16+g] != NOISE_BT && !cpe->ch[1].zeroes[w*16+g] &&
     118        8543 :                 ff_sfdelta_can_remove_band(sce1, nextband1, prev_sf1, w*16+g)) {
     119        8543 :                 float ener0 = 0.0f, ener1 = 0.0f, ener01 = 0.0f, ener01p = 0.0f;
     120             :                 struct AACISError ph_err1, ph_err2, *best;
     121       17183 :                 for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
     122      305220 :                     for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
     123      296580 :                         float coef0 = sce0->coeffs[start+(w+w2)*128+i];
     124      296580 :                         float coef1 = sce1->coeffs[start+(w+w2)*128+i];
     125      296580 :                         ener0  += coef0*coef0;
     126      296580 :                         ener1  += coef1*coef1;
     127      296580 :                         ener01 += (coef0 + coef1)*(coef0 + coef1);
     128      296580 :                         ener01p += (coef0 - coef1)*(coef0 - coef1);
     129             :                     }
     130             :                 }
     131        8543 :                 ph_err1 = ff_aac_is_encoding_err(s, cpe, start, w, g,
     132             :                                                  ener0, ener1, ener01p, 0, -1);
     133        8543 :                 ph_err2 = ff_aac_is_encoding_err(s, cpe, start, w, g,
     134             :                                                  ener0, ener1, ener01, 0, +1);
     135        8543 :                 best = (ph_err1.pass && ph_err1.error < ph_err2.error) ? &ph_err1 : &ph_err2;
     136        8543 :                 if (best->pass) {
     137        8321 :                     cpe->is_mask[w*16+g] = 1;
     138        8321 :                     cpe->ms_mask[w*16+g] = 0;
     139        8321 :                     cpe->ch[0].is_ener[w*16+g] = sqrt(ener0 / best->ener01);
     140        8321 :                     cpe->ch[1].is_ener[w*16+g] = ener0/ener1;
     141        8321 :                     cpe->ch[1].band_type[w*16+g] = (best->phase > 0) ? INTENSITY_BT : INTENSITY_BT2;
     142        8321 :                     if (prev_is && prev_bt != cpe->ch[1].band_type[w*16+g]) {
     143             :                         /** Flip M/S mask and pick the other CB, since it encodes more efficiently */
     144        1361 :                         cpe->ms_mask[w*16+g] = 1;
     145        1361 :                         cpe->ch[1].band_type[w*16+g] = (best->phase > 0) ? INTENSITY_BT2 : INTENSITY_BT;
     146             :                     }
     147        8321 :                     prev_bt = cpe->ch[1].band_type[w*16+g];
     148        8321 :                     count++;
     149             :                 }
     150             :             }
     151       28945 :             if (!sce1->zeroes[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)
     152       17651 :                 prev_sf1 = sce1->sf_idx[w*16+g];
     153       28945 :             prev_is = cpe->is_mask[w*16+g];
     154       28945 :             start += sce0->ics.swb_sizes[g];
     155             :         }
     156             :     }
     157         591 :     cpe->is_mode = !!count;
     158             : }

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