mirror of
https://github.com/FFmpeg/FFmpeg.git
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106 lines
3.3 KiB
C
106 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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#define USE_FIXED 1
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#include "libavutil/thread.h"
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#include "libavcodec/aac_defines.h"
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#include "libavcodec/avcodec.h"
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#include "aacdec.h"
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#include "libavcodec/aactab.h"
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#include "libavcodec/sinewin_fixed_tablegen.h"
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#include "libavcodec/kbdwin.h"
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#include "libavcodec/cbrt_data.h"
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#include "libavcodec/aacsbr.h"
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DECLARE_ALIGNED(32, static int, aac_kbd_long_1024_fixed)[1024];
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DECLARE_ALIGNED(32, static int, aac_kbd_short_128_fixed)[128];
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DECLARE_ALIGNED(32, static int, aac_kbd_long_960_fixed)[960];
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DECLARE_ALIGNED(32, static int, aac_kbd_short_120_fixed)[120];
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DECLARE_ALIGNED(32, static int, aac_kbd_long_768_fixed)[768];
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DECLARE_ALIGNED(32, static int, aac_kbd_short_96_fixed)[96];
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static void init_tables_fixed_fn(void)
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{
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ff_cbrt_tableinit_fixed();
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ff_kbd_window_init_fixed(aac_kbd_long_1024_fixed, 4.0, 1024);
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ff_kbd_window_init_fixed(aac_kbd_short_128_fixed, 6.0, 128);
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ff_kbd_window_init_fixed(aac_kbd_long_960_fixed, 4.0, 960);
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ff_kbd_window_init_fixed(aac_kbd_short_120_fixed, 6.0, 120);
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ff_aac_sbr_init_fixed();
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init_sine_windows_fixed();
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}
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static const int cce_scale_fixed[8] = {
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Q30(1.0), //2^(0/8)
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Q30(1.0905077327), //2^(1/8)
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Q30(1.1892071150), //2^(2/8)
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Q30(1.2968395547), //2^(3/8)
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Q30(1.4142135624), //2^(4/8)
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Q30(1.5422108254), //2^(5/8)
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Q30(1.6817928305), //2^(6/8)
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Q30(1.8340080864), //2^(7/8)
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};
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/** Dequantization-related */
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#include "aacdec_fixed_dequant.h"
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#include "aacdec_fixed_coupling.h"
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#include "aacdec_fixed_prediction.h"
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#include "aacdec_dsp_template.c"
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#include "aacdec_proc_template.c"
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av_cold int ff_aac_decode_init_fixed(AVCodecContext *avctx)
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{
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static AVOnce init_fixed_once = AV_ONCE_INIT;
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AACDecContext *ac = avctx->priv_data;
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ac->is_fixed = 1;
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avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
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aac_dsp_init_fixed(&ac->dsp);
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aac_proc_init_fixed(&ac->proc);
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ac->fdsp = avpriv_alloc_fixed_dsp(avctx->flags & AV_CODEC_FLAG_BITEXACT);
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if (!ac->fdsp)
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return AVERROR(ENOMEM);
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ff_thread_once(&init_fixed_once, init_tables_fixed_fn);
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return ff_aac_decode_init(avctx);
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}
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