mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
3.3 KiB
90 lines
3.3 KiB
/* |
|
* AAC decoder |
|
* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) |
|
* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com ) |
|
* Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com> |
|
* |
|
* AAC LATM decoder |
|
* Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz> |
|
* Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net> |
|
* |
|
* AAC decoder fixed-point implementation |
|
* Copyright (c) 2013 |
|
* MIPS Technologies, Inc., California. |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_AAC_AACDEC_FLOAT_COUPLING_H |
|
#define AVCODEC_AAC_AACDEC_FLOAT_COUPLING_H |
|
|
|
#include "aacdec.h" |
|
|
|
/** |
|
* Apply dependent channel coupling (applied before IMDCT). |
|
* |
|
* @param index index into coupling gain array |
|
*/ |
|
static void AAC_RENAME(apply_dependent_coupling)(AACDecContext *ac, |
|
SingleChannelElement *target, |
|
ChannelElement *cce, int index) |
|
{ |
|
IndividualChannelStream *ics = &cce->ch[0].ics; |
|
const uint16_t *offsets = ics->swb_offset; |
|
float *dest = target->coeffs; |
|
const float *src = cce->ch[0].coeffs; |
|
int g, i, group, k, idx = 0; |
|
if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) { |
|
av_log(ac->avctx, AV_LOG_ERROR, |
|
"Dependent coupling is not supported together with LTP\n"); |
|
return; |
|
} |
|
for (g = 0; g < ics->num_window_groups; g++) { |
|
for (i = 0; i < ics->max_sfb; i++, idx++) { |
|
if (cce->ch[0].band_type[idx] != ZERO_BT) { |
|
const float gain = cce->coup.gain[index][idx]; |
|
for (group = 0; group < ics->group_len[g]; group++) { |
|
for (k = offsets[i]; k < offsets[i + 1]; k++) { |
|
// FIXME: SIMDify |
|
dest[group * 128 + k] += gain * src[group * 128 + k]; |
|
} |
|
} |
|
} |
|
} |
|
dest += ics->group_len[g] * 128; |
|
src += ics->group_len[g] * 128; |
|
} |
|
} |
|
|
|
/** |
|
* Apply independent channel coupling (applied after IMDCT). |
|
* |
|
* @param index index into coupling gain array |
|
*/ |
|
static void AAC_RENAME(apply_independent_coupling)(AACDecContext *ac, |
|
SingleChannelElement *target, |
|
ChannelElement *cce, int index) |
|
{ |
|
const float gain = cce->coup.gain[index][0]; |
|
const float *src = cce->ch[0].output; |
|
float *dest = target->output; |
|
const int len = 1024 << (ac->oc[1].m4ac.sbr == 1); |
|
|
|
ac->fdsp->vector_fmac_scalar(dest, src, gain, len); |
|
} |
|
|
|
#endif /* AVCODEC_AAC_AACDEC_FLOAT_COUPLING_H */
|
|
|