| /* |
| * decode_i396.c: Mpeg Layer-1,2,3 audio decoder |
| * |
| * Copyright (C) 1999-2010 The L.A.M.E. project |
| * |
| * Initially written by Michael Hipp, see also AUTHORS and README. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| * |
| * 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 1.18.2.2 2010/03/22 14:17:14 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(TYPE,samples,sum,clip) \ |
| if( (sum) > 32767.0) { *(samples) = 0x7fff; (clip)++; } \ |
| else if( (sum) < -32768.0) { *(samples) = -0x8000; (clip)++; } \ |
| else { *(samples) = (TYPE)((sum)>0 ? (sum)+0.5 : (sum)-0.5) ; } |
| |
| #define WRITE_SAMPLE_UNCLIPPED(TYPE,samples,sum,clip) \ |
| *samples = (TYPE)sum; |
| |
| /* *INDENT-OFF* */ |
| |
| /* 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; |
| |
| /* *INDENT-ON* */ |
| |
| |
| 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) |
| } |
| |
| /* *INDENT-OFF* */ |
| /* 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 (TYPE,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 (TYPE,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 (TYPE,samples,sum,clip); \ |
| } \ |
| } \ |
| *pnt += 64*sizeof(TYPE); \ |
| \ |
| return clip; |
| /* *INDENT-ON* */ |
| |
| |
| 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) |
| } |
