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/*****************************************************************************
* ac3_exponent.c: ac3 exponent calculations
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
*
* Authors:
*
* 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, USA.
*****************************************************************************/
#include "defs.h"
#include <stdio.h> /* "intf_msg.h" */
#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
#include "plugins.h"
#include "intf_msg.h"
#include "ac3_decoder.h"
#include "ac3_bit_stream.h"
#include "ac3_internal.h"
static const s16 exps_1[128] =
{ -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
0, 0, 0 };
static const s16 exps_2[128] =
{ -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
0, 0, 0 };
static const s16 exps_3[128] =
{ -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
0, 0, 0 };
#define UNPACK_FBW 1
#define UNPACK_CPL 2
#define UNPACK_LFE 4
static __inline__ int exp_unpack_ch (ac3dec_t * p_ac3dec, u16 type,
u16 expstr, u16 ngrps, u16 initial_exp,
u16 exps[], u16 * dest)
{
u16 i,j;
s16 exp_acc;
if (expstr == EXP_REUSE) {
return 0;
}
/* Handle the initial absolute exponent */
exp_acc = initial_exp;
j = 0;
/* In the case of a fbw channel then the initial absolute values is
* also an exponent */
if (type != UNPACK_CPL) {
dest[j++] = exp_acc;
}
/* Loop through the groups and fill the dest array appropriately */
switch (expstr) {
case EXP_D15: /* 1 */
for (i = 0; i < ngrps; i++) {
if (exps[i] > 124) {
intf_ErrMsg ( "ac3dec error: invalid exponent\n" );
return 1;
}
exp_acc += (exps_1[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
exp_acc += (exps_2[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
exp_acc += (exps_3[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
}
break;
case EXP_D25: /* 2 */
for (i = 0; i < ngrps; i++) {
if (exps[i] > 124) {
intf_ErrMsg ( "ac3dec error: invalid exponent\n" );
return 1;
}
exp_acc += (exps_1[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
dest[j++] = exp_acc;
exp_acc += (exps_2[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
dest[j++] = exp_acc;
exp_acc += (exps_3[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
dest[j++] = exp_acc;
}
break;
case EXP_D45: /* 3 */
for (i = 0; i < ngrps; i++) {
if (exps[i] > 124) {
intf_ErrMsg ( "ac3dec error: invalid exponent\n" );
return 1;
}
exp_acc += (exps_1[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
dest[j++] = exp_acc;
dest[j++] = exp_acc;
dest[j++] = exp_acc;
exp_acc += (exps_2[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
dest[j++] = exp_acc;
dest[j++] = exp_acc;
dest[j++] = exp_acc;
exp_acc += (exps_3[exps[i]] /*- 2*/);
dest[j++] = exp_acc;
dest[j++] = exp_acc;
dest[j++] = exp_acc;
dest[j++] = exp_acc;
}
break;
}
return 0;
}
int exponent_unpack (ac3dec_t * p_ac3dec)
{
u16 i;
for (i = 0; i < p_ac3dec->bsi.nfchans; i++) {
if (exp_unpack_ch (p_ac3dec, UNPACK_FBW, p_ac3dec->audblk.chexpstr[i],
p_ac3dec->audblk.nchgrps[i],
p_ac3dec->audblk.exps[i][0],
&p_ac3dec->audblk.exps[i][1],
p_ac3dec->audblk.fbw_exp[i]))
return 1;
}
if (p_ac3dec->audblk.cplinu) {
if (exp_unpack_ch (p_ac3dec, UNPACK_CPL, p_ac3dec->audblk.cplexpstr,
p_ac3dec->audblk.ncplgrps,
p_ac3dec->audblk.cplabsexp << 1,
p_ac3dec->audblk.cplexps,
&p_ac3dec->audblk.cpl_exp[p_ac3dec->audblk.cplstrtmant]))
return 1;
}
if (p_ac3dec->bsi.lfeon) {
if (exp_unpack_ch (p_ac3dec, UNPACK_LFE, p_ac3dec->audblk.lfeexpstr,
2, p_ac3dec->audblk.lfeexps[0],
&p_ac3dec->audblk.lfeexps[1],
p_ac3dec->audblk.lfe_exp))
return 1;
}
return 0;
}