/*
* Mpeg Layer-1,2,3 audio decoder
* ------------------------------
* copyright (c) 1995,1996,1997 by Michael Hipp, All rights reserved.
* modified by Aleksander Korzynski (Olcios) '2003
* See also 'README'
*
* slighlty optimized for machines without autoincrement/decrement.
* The performance is highly compiler dependend. Maybe
* the decode.c version for 'normal' processor may be faster
* even for Intel processors.
*/
/* $Id: decode_i386.c,v 1.17 2004/04/14 22:15:44 robert Exp $ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <string.h>
#else
# ifndef HAVE_STRCHR
# define strchr index
# define strrchr rindex
# endif
char *strchr (), *strrchr ();
# ifndef HAVE_MEMCPY
# define memcpy(d, s, n) bcopy ((s), (d), (n))
# define memmove(d, s, n) bcopy ((s), (d), (n))
# endif
#endif
#if defined(__riscos__) && defined(FPA10)
#include "ymath.h"
#else
#include <math.h>
#endif
#include "decode_i386.h"
#include "dct64_i386.h"
#include "tabinit.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
/* old WRITE_SAMPLE_CLIPPED */
#define WRITE_SAMPLE_CLIPPED(samples,sum,clip) \
if( (sum) > 32767.0) { *(samples) = 0x7fff; (clip)++; } \
else if( (sum) < -32768.0) { *(samples) = -0x8000; (clip)++; } \
else { *(samples) = ((sum)>0 ? (sum)+0.5 : (sum)-0.5) ; }
#define WRITE_SAMPLE_UNCLIPPED(samples,sum,clip) \
*samples = sum;
/* versions: clipped (when TYPE == short) and unclipped (when TYPE == real) of synth_1to1_mono* functions */
#define SYNTH_1TO1_MONO_CLIPCHOICE(TYPE,SYNTH_1TO1) \
TYPE samples_tmp[64]; \
TYPE *tmp1 = samples_tmp; \
int i,ret; \
int pnt1 = 0; \
\
ret = SYNTH_1TO1 (mp,bandPtr,0,(unsigned char *) samples_tmp,&pnt1); \
out += *pnt; \
\
for(i=0;i<32;i++) { \
*( (TYPE *) out) = *tmp1; \
out += sizeof(TYPE); \
tmp1 += 2; \
} \
*pnt += 32*sizeof(TYPE); \
\
return ret;
int synth_1to1_mono(PMPSTR mp, real *bandPtr,unsigned char *out,int *pnt)
{
SYNTH_1TO1_MONO_CLIPCHOICE(short,synth_1to1)
}
int synth_1to1_mono_unclipped(PMPSTR mp, real *bandPtr, unsigned char *out,int *pnt)
{
SYNTH_1TO1_MONO_CLIPCHOICE(real,synth_1to1_unclipped)
}
/* versions: clipped (when TYPE == short) and unclipped (when TYPE == real) of synth_1to1* functions */
#define SYNTH_1TO1_CLIPCHOICE(TYPE,WRITE_SAMPLE) \
static const int step = 2; \
int bo; \
TYPE *samples = (TYPE *) (out + *pnt); \
\
real *b0,(*buf)[0x110]; \
int clip = 0; \
int bo1; \
\
bo = mp->synth_bo; \
\
if(!channel) { \
bo--; \
bo &= 0xf; \
buf = mp->synth_buffs[0]; \
} \
else { \
samples++; \
buf = mp->synth_buffs[1]; \
} \
\
if(bo & 0x1) { \
b0 = buf[0]; \
bo1 = bo; \
dct64(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr); \
} \
else { \
b0 = buf[1]; \
bo1 = bo+1; \
dct64(buf[0]+bo,buf[1]+bo+1,bandPtr); \
} \
\
mp->synth_bo = bo; \
\
{ \
int j; \
real *window = decwin + 16 - bo1; \
\
for (j=16;j;j--,b0+=0x10,window+=0x20,samples+=step) \
{ \
real sum; \
sum = window[0x0] * b0[0x0]; \
sum -= window[0x1] * b0[0x1]; \
sum += window[0x2] * b0[0x2]; \
sum -= window[0x3] * b0[0x3]; \
sum += window[0x4] * b0[0x4]; \
sum -= window[0x5] * b0[0x5]; \
sum += window[0x6] * b0[0x6]; \
sum -= window[0x7] * b0[0x7]; \
sum += window[0x8] * b0[0x8]; \
sum -= window[0x9] * b0[0x9]; \
sum += window[0xA] * b0[0xA]; \
sum -= window[0xB] * b0[0xB]; \
sum += window[0xC] * b0[0xC]; \
sum -= window[0xD] * b0[0xD]; \
sum += window[0xE] * b0[0xE]; \
sum -= window[0xF] * b0[0xF]; \
\
WRITE_SAMPLE (samples,sum,clip); \
} \
\
{ \
real sum; \
sum = window[0x0] * b0[0x0]; \
sum += window[0x2] * b0[0x2]; \
sum += window[0x4] * b0[0x4]; \
sum += window[0x6] * b0[0x6]; \
sum += window[0x8] * b0[0x8]; \
sum += window[0xA] * b0[0xA]; \
sum += window[0xC] * b0[0xC]; \
sum += window[0xE] * b0[0xE]; \
WRITE_SAMPLE (samples,sum,clip); \
b0-=0x10,window-=0x20,samples+=step; \
} \
window += bo1<<1; \
\
for (j=15;j;j--,b0-=0x10,window-=0x20,samples+=step) \
{ \
real sum; \
sum = -window[-0x1] * b0[0x0]; \
sum -= window[-0x2] * b0[0x1]; \
sum -= window[-0x3] * b0[0x2]; \
sum -= window[-0x4] * b0[0x3]; \
sum -= window[-0x5] * b0[0x4]; \
sum -= window[-0x6] * b0[0x5]; \
sum -= window[-0x7] * b0[0x6]; \
sum -= window[-0x8] * b0[0x7]; \
sum -= window[-0x9] * b0[0x8]; \
sum -= window[-0xA] * b0[0x9]; \
sum -= window[-0xB] * b0[0xA]; \
sum -= window[-0xC] * b0[0xB]; \
sum -= window[-0xD] * b0[0xC]; \
sum -= window[-0xE] * b0[0xD]; \
sum -= window[-0xF] * b0[0xE]; \
sum -= window[-0x0] * b0[0xF]; \
\
WRITE_SAMPLE (samples,sum,clip); \
} \
} \
*pnt += 64*sizeof(TYPE); \
\
return clip;
int synth_1to1(PMPSTR mp, real *bandPtr,int channel,unsigned char *out, int *pnt)
{
SYNTH_1TO1_CLIPCHOICE(short,WRITE_SAMPLE_CLIPPED)
}
int synth_1to1_unclipped(PMPSTR mp, real *bandPtr,int channel, unsigned char *out, int *pnt)
{
SYNTH_1TO1_CLIPCHOICE(real,WRITE_SAMPLE_UNCLIPPED)
}
root