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/*
* 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_120)[120];
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];
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 int init(AACDecContext *ac)
{
static AVOnce init_float_once = AV_ONCE_INIT;
ff_thread_once(&init_float_once, init_tables_float_fn);
ac->fdsp = avpriv_float_dsp_alloc(ac->avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!ac->fdsp)
return AVERROR(ENOMEM);
return 0;
}
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"
#ifndef VMUL2
static 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 VMUL4
static 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 VMUL2S
static 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 VMUL4S
static 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"
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