/* * 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 */ #define USE_FIXED 0 #include "libavutil/thread.h" #include "libavcodec/aac_defines.h" #include "libavcodec/avcodec.h"#include "aacdec.h"#include "libavcodec/aactab.h"#include "libavcodec/sinewin.h"#include "libavcodec/kbdwin.h"#include "libavcodec/cbrt_data.h"#include "libavutil/mathematics.h"#include "libavcodec/aacsbr.h" DECLARE_ALIGNED(32, static float, sine_96)[96];DECLARE_ALIGNED(32, static float, sine_120)[120];DECLARE_ALIGNED(32, static float, sine_768)[768];DECLARE_ALIGNED(32, static float, sine_960)[960];DECLARE_ALIGNED(32, static float, aac_kbd_long_960)[960];DECLARE_ALIGNED(32, static float, aac_kbd_short_120)[120];DECLARE_ALIGNED(32, static float, aac_kbd_long_768)[768];DECLARE_ALIGNED(32, static float, aac_kbd_short_96)[96]; static void init_tables_float_fn(void){    ff_cbrt_tableinit();     ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);    ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);     ff_kbd_window_init(aac_kbd_long_960, 4.0, 960);    ff_kbd_window_init(aac_kbd_short_120, 6.0, 120);     ff_sine_window_init(sine_960, 960);    ff_sine_window_init(sine_120, 120);    ff_init_ff_sine_windows(9);     ff_aac_sbr_init();     ff_aac_float_common_init();} static const float cce_scale[] = {    1.09050773266525765921, //2^(1/8)    1.18920711500272106672, //2^(1/4)    M_SQRT2,    2,}; /** Dequantization-related **/#include "aacdec_tab.h"#include "libavutil/intfloat.h" #include "config.h"#if ARCH_ARM#include "libavcodec/arm/aac.h"#endif #ifndef VMUL2static inline float *VMUL2(float *dst, const float *v, unsigned idx,                           const float *scale){    float s = *scale;    *dst++ = v[idx    & 15] * s;    *dst++ = v[idx>>4 & 15] * s;    return dst;}#endif #ifndef VMUL4static inline float *VMUL4(float *dst, const float *v, unsigned idx,                           const float *scale){    float s = *scale;    *dst++ = v[idx    & 3] * s;    *dst++ = v[idx>>2 & 3] * s;    *dst++ = v[idx>>4 & 3] * s;    *dst++ = v[idx>>6 & 3] * s;    return dst;}#endif #ifndef VMUL2Sstatic inline float *VMUL2S(float *dst, const float *v, unsigned idx,                            unsigned sign, const float *scale){    union av_intfloat32 s0, s1;     s0.f = s1.f = *scale;    s0.i ^= sign >> 1 << 31;    s1.i ^= sign      << 31;     *dst++ = v[idx    & 15] * s0.f;    *dst++ = v[idx>>4 & 15] * s1.f;     return dst;}#endif #ifndef VMUL4Sstatic inline float *VMUL4S(float *dst, const float *v, unsigned idx,                            unsigned sign, const float *scale){    unsigned nz = idx >> 12;    union av_intfloat32 s = { .f = *scale };    union av_intfloat32 t;     t.i = s.i ^ (sign & 1U<<31);    *dst++ = v[idx    & 3] * t.f;     sign <<= nz & 1; nz >>= 1;    t.i = s.i ^ (sign & 1U<<31);    *dst++ = v[idx>>2 & 3] * t.f;     sign <<= nz & 1; nz >>= 1;    t.i = s.i ^ (sign & 1U<<31);    *dst++ = v[idx>>4 & 3] * t.f;     sign <<= nz & 1;    t.i = s.i ^ (sign & 1U<<31);    *dst++ = v[idx>>6 & 3] * t.f;     return dst;}#endif #include "aacdec_float_coupling.h"#include "aacdec_float_prediction.h"#include "aacdec_dsp_template.c"#include "aacdec_proc_template.c" av_cold int ff_aac_decode_init_float(AVCodecContext *avctx){    static AVOnce init_float_once = AV_ONCE_INIT;    AACDecContext *ac = avctx->priv_data;     ac->is_fixed = 0;    avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;     aac_dsp_init(&ac->dsp);    aac_proc_init(&ac->proc);     ac->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);    if (!ac->fdsp)        return AVERROR(ENOMEM);     ff_thread_once(&init_float_once, init_tables_float_fn);     return ff_aac_decode_init(avctx);}