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94 lines
3.0 KiB
94 lines
3.0 KiB
10 months ago
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/*
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* AAC decoder
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* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
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* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
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* Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com>
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*
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* AAC LATM decoder
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* Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
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* Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net>
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*
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* AAC decoder fixed-point implementation
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* Copyright (c) 2013
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* MIPS Technologies, Inc., California.
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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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#include "libavcodec/aacdec.h"
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#include "libavcodec/aac_defines.h"
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#include "libavcodec/aactab.h"
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/**
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* Convert integer scalefactors to the decoder's native expected
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* scalefactor values.
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*/
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static void AAC_RENAME(dequant_scalefactors)(SingleChannelElement *sce)
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{
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IndividualChannelStream *ics = &sce->ics;
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const enum BandType *band_type = sce->band_type;
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const int *band_type_run_end = sce->band_type_run_end;
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const int *sfo = sce->sfo;
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INTFLOAT *sf = sce->AAC_RENAME(sf);
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int g, i, idx = 0;
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for (g = 0; g < ics->num_window_groups; g++) {
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for (i = 0; i < ics->max_sfb;) {
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int run_end = band_type_run_end[idx];
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switch (band_type[idx]) {
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case ZERO_BT:
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for (; i < run_end; i++, idx++)
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sf[idx] = FIXR(0.);
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break;
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case INTENSITY_BT: /* fallthrough */
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case INTENSITY_BT2:
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for (; i < run_end; i++, idx++) {
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#if USE_FIXED
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sf[idx] = 100 - sfo[idx];
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#else
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sf[idx] = ff_aac_pow2sf_tab[-sfo[idx] + POW_SF2_ZERO];
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#endif /* USE_FIXED */
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}
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break;
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case NOISE_BT:
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for (; i < run_end; i++, idx++) {
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#if USE_FIXED
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sf[idx] = -(100 + sfo[idx]);
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#else
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sf[idx] = -ff_aac_pow2sf_tab[sfo[idx] + POW_SF2_ZERO];
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#endif /* USE_FIXED */
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}
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break;
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default:
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for (; i < run_end; i++, idx++) {
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#if USE_FIXED
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sf[idx] = -sfo[idx];
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#else
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sf[idx] = -ff_aac_pow2sf_tab[sfo[idx] - 100 + POW_SF2_ZERO];
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#endif /* USE_FIXED */
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}
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break;
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}
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}
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}
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}
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const AACDecDSP AAC_RENAME(aac_dsp) = {
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.dequant_scalefactors = &AAC_RENAME(dequant_scalefactors),
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};
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