diff options
author | arpi_esp <arpi_esp@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2001-02-24 20:28:24 +0000 |
---|---|---|
committer | arpi_esp <arpi_esp@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2001-02-24 20:28:24 +0000 |
commit | d34041569e71fc9bd772354e94dc9d16061072a5 (patch) | |
tree | 8f481cae1c70f32d1756fbe5f39000577b73042d /mp3lib/decod386.c | |
parent | e95a95ece09bac96bdfd37322f96c6f57ef79ebc (diff) | |
download | mpv-d34041569e71fc9bd772354e94dc9d16061072a5.tar.bz2 mpv-d34041569e71fc9bd772354e94dc9d16061072a5.tar.xz |
Initial revision
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'mp3lib/decod386.c')
-rw-r--r-- | mp3lib/decod386.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/mp3lib/decod386.c b/mp3lib/decod386.c new file mode 100644 index 0000000000..f1a7e26b76 --- /dev/null +++ b/mp3lib/decod386.c @@ -0,0 +1,194 @@ +/* + * Mpeg Layer-1,2,3 audio decoder + * ------------------------------ + * copyright (c) 1995,1996,1997 by Michael Hipp, All rights reserved. + * 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. + */ + + + + /* new WRITE_SAMPLE */ + /* sizeof(int) == 4 */ +#define WRITE_SAMPLE(samples,sum,clip) { \ + double dtemp; long v; \ + dtemp = ((((65536.0 * 65536.0 * 16)+(65536.0 * 0.5))* 65536.0)) + (sum);\ + v = ((*(int *)&dtemp) - 0x80000000); \ + if( v > 32767) { *(samples) = 0x7fff; (clip)++; } \ + else if( v < -32768) { *(samples) = -0x8000; (clip)++; } \ + else { *(samples) = v; } \ +} + + +/* +#define WRITE_SAMPLE(samples,sum,clip) { \ + double dtemp; int v; \ + dtemp = ((((65536.0 * 65536.0 * 16)+(65536.0 * 0.5))* 65536.0)) + (sum);\ + v = ((*(int *)&dtemp) - 0x80000000); \ + if( v > 32767) { *(samples) = 0x7fff; (clip)++; } \ + else if( v < -32768) { *(samples) = -0x8000; (clip)++; } \ + else { *(samples) = v; } \ +} +*/ + +static int synth_1to1_mono(real *bandPtr,unsigned char *samples,int *pnt) +{ + short samples_tmp[64]; + short *tmp1 = samples_tmp; + int i,ret; + int pnt1 = 0; + + ret = synth_1to1(bandPtr,0,(unsigned char *) samples_tmp,&pnt1); + samples += *pnt; + + for(i=0;i<32;i++) { + *( (short *) samples) = *tmp1; + samples += 2; + tmp1 += 2; + } + *pnt += 64; + + return ret; +} + + +static int synth_1to1_mono2stereo(real *bandPtr,unsigned char *samples,int *pnt) +{ + int i,ret; + + ret = synth_1to1(bandPtr,0,samples,pnt); + samples = samples + *pnt - 128; + + for(i=0;i<32;i++) { + ((short *)samples)[1] = ((short *)samples)[0]; + samples+=4; + } + + return ret; +} + + +static int synth_1to1(real *bandPtr,int channel,unsigned char *out,int *pnt) +{ + static real buffs[2][2][0x110]; + static const int step = 2; + static int bo = 1; + short *samples = (short *) (out + *pnt); + + real *b0,(*buf)[0x110]; + int clip = 0; + int bo1; + + #ifdef HAVE_3DNOW + if ( _3dnow ) + { + int ret; + ret=synth_1to1_3dnow( bandPtr,channel,out+*pnt ); + *pnt+=128; + return ret; + } + #endif + if ( _i586 ) + { + int ret; + ret=synth_1to1_pent( bandPtr,channel,out+*pnt ); + *pnt+=128; + return ret; + } + + if(!channel) { /* channel=0 */ + bo--; + bo &= 0xf; + buf = buffs[0]; + } + else { + samples++; + buf = 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); + } + + { + register 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 += 128; + + return clip; + +} + |