* ac3_exponent.c: ac3 exponent calculations
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
+ * $Id: ac3_exponent.c,v 1.25 2001/05/15 16:19:42 sam Exp $
*
- * Authors:
+ * Authors: Michel Kaempf <maxx@via.ecp.fr>
+ * Michel Lespinasse <walken@zoy.org>
+ * Aaron Holtzman <aholtzma@engr.uvic.ca>
*
* 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
#include "defs.h"
-#include <stdio.h> /* "intf_msg.h" */
+#include <string.h> /* memcpy(), memset() */
#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;
- }
+#include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
- /* Handle the initial absolute exponent */
- exp_acc = initial_exp;
- j = 0;
+#include "stream_control.h"
+#include "input_ext-dec.h"
- /* 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" );
- 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;
+#include "audio_output.h"
- case EXP_D25: /* 2 */
- for (i = 0; i < ngrps; i++) {
- if (exps[i] > 124) {
- intf_ErrMsg ( "ac3dec error: invalid exponent" );
- 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;
+#include "ac3_imdct.h"
+#include "ac3_downmix.h"
+#include "ac3_decoder.h"
- case EXP_D45: /* 3 */
- for (i = 0; i < ngrps; i++) {
- if (exps[i] > 124) {
- intf_ErrMsg ( "ac3dec error: invalid exponent" );
- 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;
- }
+#include "ac3_internal.h"
- return 0;
-}
+#include "ac3_exponent.h"
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;
+ 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 (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;
+ 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 (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;
+ 2, p_ac3dec->audblk.lfeexps[0],
+ &p_ac3dec->audblk.lfeexps[1],
+ p_ac3dec->audblk.lfe_exp))
+ {
+ return 1;
+ }
}
return 0;
}
+
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