| /* |
| * 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 */ |