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93 lines
3.0 KiB
93 lines
3.0 KiB
/* |
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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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