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225 lines
10 KiB
C
225 lines
10 KiB
C
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/*
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* decode_i396.c: Mpeg Layer-1,2,3 audio decoder
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*
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* Copyright (C) 1999-2010 The L.A.M.E. project
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*
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* Initially written by Michael Hipp, see also AUTHORS and README.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*
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* Slighlty optimized for machines without autoincrement/decrement.
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* The performance is highly compiler dependend. Maybe
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* the decode.c version for 'normal' processor may be faster
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* even for Intel processors.
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*/
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/* $Id: decode_i386.c,v 1.22 2010/03/22 14:30:19 robert Exp $ */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <string.h>
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#else
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# ifndef HAVE_STRCHR
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# define strchr index
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# define strrchr rindex
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# endif
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char *strchr(), *strrchr();
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# ifndef HAVE_MEMCPY
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# define memcpy(d, s, n) bcopy ((s), (d), (n))
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# define memmove(d, s, n) bcopy ((s), (d), (n))
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# endif
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#endif
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#if defined(__riscos__) && defined(FPA10)
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#include "ymath.h"
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#else
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#include <math.h>
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#endif
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#include "decode_i386.h"
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#include "dct64_i386.h"
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#include "tabinit.h"
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif
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/* old WRITE_SAMPLE_CLIPPED */
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#define WRITE_SAMPLE_CLIPPED(TYPE,samples,sum,clip) \
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if( (sum) > 32767.0) { *(samples) = 0x7fff; (clip)++; } \
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else if( (sum) < -32768.0) { *(samples) = -0x8000; (clip)++; } \
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else { *(samples) = (TYPE)((sum)>0 ? (sum)+0.5 : (sum)-0.5) ; }
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#define WRITE_SAMPLE_UNCLIPPED(TYPE,samples,sum,clip) \
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*samples = (TYPE)sum;
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/* *INDENT-OFF* */
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/* versions: clipped (when TYPE == short) and unclipped (when TYPE == real) of synth_1to1_mono* functions */
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#define SYNTH_1TO1_MONO_CLIPCHOICE(TYPE,SYNTH_1TO1) \
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TYPE samples_tmp[64]; \
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TYPE *tmp1 = samples_tmp; \
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int i,ret; \
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int pnt1 = 0; \
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\
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ret = SYNTH_1TO1 (mp,bandPtr,0,(unsigned char *) samples_tmp,&pnt1); \
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out += *pnt; \
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\
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for(i=0;i<32;i++) { \
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*( (TYPE *) out) = *tmp1; \
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out += sizeof(TYPE); \
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tmp1 += 2; \
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} \
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*pnt += 32*sizeof(TYPE); \
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\
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return ret;
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/* *INDENT-ON* */
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int
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synth_1to1_mono(PMPSTR mp, real * bandPtr, unsigned char *out, int *pnt)
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{
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SYNTH_1TO1_MONO_CLIPCHOICE(short, synth_1to1)
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} int
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synth_1to1_mono_unclipped(PMPSTR mp, real * bandPtr, unsigned char *out, int *pnt)
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{
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SYNTH_1TO1_MONO_CLIPCHOICE(real, synth_1to1_unclipped)
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}
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/* *INDENT-OFF* */
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/* versions: clipped (when TYPE == short) and unclipped (when TYPE == real) of synth_1to1* functions */
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#define SYNTH_1TO1_CLIPCHOICE(TYPE,WRITE_SAMPLE) \
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static const int step = 2; \
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int bo; \
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TYPE *samples = (TYPE *) (out + *pnt); \
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\
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real *b0,(*buf)[0x110]; \
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int clip = 0; \
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int bo1; \
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\
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bo = mp->synth_bo; \
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\
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if(!channel) { \
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bo--; \
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bo &= 0xf; \
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buf = mp->synth_buffs[0]; \
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} \
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else { \
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samples++; \
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buf = mp->synth_buffs[1]; \
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} \
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\
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if(bo & 0x1) { \
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b0 = buf[0]; \
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bo1 = bo; \
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dct64(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr); \
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} \
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else { \
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b0 = buf[1]; \
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bo1 = bo+1; \
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dct64(buf[0]+bo,buf[1]+bo+1,bandPtr); \
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} \
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\
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mp->synth_bo = bo; \
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\
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{ \
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int j; \
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real *window = decwin + 16 - bo1; \
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\
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for (j=16;j;j--,b0+=0x10,window+=0x20,samples+=step) \
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{ \
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real sum; \
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sum = window[0x0] * b0[0x0]; \
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sum -= window[0x1] * b0[0x1]; \
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sum += window[0x2] * b0[0x2]; \
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sum -= window[0x3] * b0[0x3]; \
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sum += window[0x4] * b0[0x4]; \
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sum -= window[0x5] * b0[0x5]; \
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sum += window[0x6] * b0[0x6]; \
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sum -= window[0x7] * b0[0x7]; \
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sum += window[0x8] * b0[0x8]; \
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sum -= window[0x9] * b0[0x9]; \
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sum += window[0xA] * b0[0xA]; \
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sum -= window[0xB] * b0[0xB]; \
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sum += window[0xC] * b0[0xC]; \
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sum -= window[0xD] * b0[0xD]; \
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sum += window[0xE] * b0[0xE]; \
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sum -= window[0xF] * b0[0xF]; \
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\
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WRITE_SAMPLE (TYPE,samples,sum,clip); \
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} \
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\
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{ \
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real sum; \
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sum = window[0x0] * b0[0x0]; \
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sum += window[0x2] * b0[0x2]; \
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sum += window[0x4] * b0[0x4]; \
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sum += window[0x6] * b0[0x6]; \
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sum += window[0x8] * b0[0x8]; \
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sum += window[0xA] * b0[0xA]; \
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sum += window[0xC] * b0[0xC]; \
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sum += window[0xE] * b0[0xE]; \
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WRITE_SAMPLE (TYPE,samples,sum,clip); \
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b0-=0x10,window-=0x20,samples+=step; \
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} \
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window += bo1<<1; \
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\
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for (j=15;j;j--,b0-=0x10,window-=0x20,samples+=step) \
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{ \
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real sum; \
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sum = -window[-0x1] * b0[0x0]; \
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sum -= window[-0x2] * b0[0x1]; \
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sum -= window[-0x3] * b0[0x2]; \
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sum -= window[-0x4] * b0[0x3]; \
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sum -= window[-0x5] * b0[0x4]; \
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sum -= window[-0x6] * b0[0x5]; \
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sum -= window[-0x7] * b0[0x6]; \
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sum -= window[-0x8] * b0[0x7]; \
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sum -= window[-0x9] * b0[0x8]; \
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sum -= window[-0xA] * b0[0x9]; \
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sum -= window[-0xB] * b0[0xA]; \
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sum -= window[-0xC] * b0[0xB]; \
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sum -= window[-0xD] * b0[0xC]; \
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sum -= window[-0xE] * b0[0xD]; \
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sum -= window[-0xF] * b0[0xE]; \
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sum -= window[-0x0] * b0[0xF]; \
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\
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WRITE_SAMPLE (TYPE,samples,sum,clip); \
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} \
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} \
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*pnt += 64*sizeof(TYPE); \
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\
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return clip;
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/* *INDENT-ON* */
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int
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synth_1to1(PMPSTR mp, real * bandPtr, int channel, unsigned char *out, int *pnt)
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{
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SYNTH_1TO1_CLIPCHOICE(short, WRITE_SAMPLE_CLIPPED)
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} int
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synth_1to1_unclipped(PMPSTR mp, real * bandPtr, int channel, unsigned char *out, int *pnt)
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{
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SYNTH_1TO1_CLIPCHOICE(real, WRITE_SAMPLE_UNCLIPPED)
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}
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