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https://github.com/FFmpeg/FFmpeg.git
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91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
/*
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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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#ifndef AVCODEC_AAC_AACDEC_FLOAT_COUPLING_H
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#define AVCODEC_AAC_AACDEC_FLOAT_COUPLING_H
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#include "aacdec.h"
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/**
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* Apply dependent channel coupling (applied before IMDCT).
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*
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* @param index index into coupling gain array
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*/
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static void AAC_RENAME(apply_dependent_coupling)(AACDecContext *ac,
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SingleChannelElement *target,
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ChannelElement *cce, int index)
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{
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IndividualChannelStream *ics = &cce->ch[0].ics;
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const uint16_t *offsets = ics->swb_offset;
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float *dest = target->coeffs;
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const float *src = cce->ch[0].coeffs;
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int g, i, group, k, idx = 0;
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if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) {
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av_log(ac->avctx, AV_LOG_ERROR,
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"Dependent coupling is not supported together with LTP\n");
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return;
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}
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for (g = 0; g < ics->num_window_groups; g++) {
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for (i = 0; i < ics->max_sfb; i++, idx++) {
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if (cce->ch[0].band_type[idx] != ZERO_BT) {
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const float gain = cce->coup.gain[index][idx];
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for (group = 0; group < ics->group_len[g]; group++) {
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for (k = offsets[i]; k < offsets[i + 1]; k++) {
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// FIXME: SIMDify
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dest[group * 128 + k] += gain * src[group * 128 + k];
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}
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}
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}
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}
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dest += ics->group_len[g] * 128;
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src += ics->group_len[g] * 128;
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}
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}
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/**
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* Apply independent channel coupling (applied after IMDCT).
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*
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* @param index index into coupling gain array
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*/
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static void AAC_RENAME(apply_independent_coupling)(AACDecContext *ac,
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SingleChannelElement *target,
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ChannelElement *cce, int index)
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{
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const float gain = cce->coup.gain[index][0];
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const float *src = cce->ch[0].output;
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float *dest = target->output;
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const int len = 1024 << (ac->oc[1].m4ac.sbr == 1);
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ac->fdsp->vector_fmac_scalar(dest, src, gain, len);
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}
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#endif /* AVCODEC_AAC_AACDEC_FLOAT_COUPLING_H */
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