devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Add codecs to librbcodec.

Browse source 
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
This commit is contained in:
Sean Bartell 2011-06-25 21:32:25 -04:00 • committed by Nils Wallménius
parent a0009907de
commit f40bfc9267
757 changed files with 122 additions and 122 deletions
Download patch file Download diff file Expand all files Collapse all files

108
lib/rbcodec/codecs/libfaad/is.c Normal file
View file

@ -0,0 +1,108 @@
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id$
**/
#include "common.h"
#include "structs.h"
#include "syntax.h"
#include "is.h"
#ifdef FIXED_POINT
static real_t pow05_table[] ICONST_ATTR = {
COEF_CONST(1.68179283050743), /* 0.5^(-3/4) */
COEF_CONST(1.41421356237310), /* 0.5^(-2/4) */
COEF_CONST(1.18920711500272), /* 0.5^(-1/4) */
COEF_CONST(1.0), /* 0.5^( 0/4) */
COEF_CONST(0.84089641525371), /* 0.5^(+1/4) */
COEF_CONST(0.70710678118655), /* 0.5^(+2/4) */
COEF_CONST(0.59460355750136) /* 0.5^(+3/4) */
};
#endif
void is_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec,
uint16_t frame_len)
{
uint8_t g, sfb, b;
uint16_t i, k;
#ifndef FIXED_POINT
real_t scale;
#else
int32_t exp, frac;
#endif
uint16_t nshort = frame_len/8;
uint8_t group = 0;
for (g = 0; g < icsr->num_window_groups; g++)
{
/* Do intensity stereo decoding */
for (b = 0; b < icsr->window_group_length[g]; b++)
{
for (sfb = 0; sfb < icsr->max_sfb; sfb++)
{
if (is_intensity(icsr, g, sfb))
{
#ifdef MAIN_DEC
/* For scalefactor bands coded in intensity stereo the
corresponding predictors in the right channel are
switched to "off".
*/
ics->pred.prediction_used[sfb] = 0;
icsr->pred.prediction_used[sfb] = 0;
#endif
#ifndef FIXED_POINT
scale = (real_t)pow(0.5, (0.25*icsr->scale_factors[g][sfb]));
#else
exp = icsr->scale_factors[g][sfb] >> 2;
frac = icsr->scale_factors[g][sfb] & 3;
#endif
/* Scale from left to right channel,
do not touch left channel */
k = (group*nshort) + icsr->swb_offset[sfb];
for (i = icsr->swb_offset[sfb]; i < icsr->swb_offset[sfb+1]; i++, k++)
{
#ifndef FIXED_POINT
r_spec[k] = MUL_R(l_spec[k], scale);
#else
if (exp < 0)
r_spec[k] = l_spec[k] << -exp;
else
r_spec[k] = l_spec[k] >> exp;
r_spec[k] = MUL_C(r_spec[k], pow05_table[frac + 3]);
#endif
if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
r_spec[k] = -r_spec[k];
}
}
}
group++;
}
}
}