win.c
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #ifdef __cplusplus
- extern "C" {
- #endif
- void window(float *vbuf, int vb_ptr, short *pcm);
- void window_dual(float *vbuf, int vb_ptr, short *pcm);
- #ifdef __cplusplus
- }
- #endif
- #ifdef _M_IX86 /* Asm versions */
- __inline short
- RoundFtoS(float f) {
- long l;
- __asm fld f
- __asm fistp l
- if (l < -32768)
- l = -32768;
- else if (l > 32767)
- l = 32767;
- return (short)l;
- }
- #else /* C versions */
- __inline short
- RoundFtoS(float f) {
- long l = (long)(f < 0.0f ? f - 0.5f : f + 0.5f);
- if (l < -32768)
- l = -32768;
- else if (l > 32767)
- l = 32767;
- return (short)l;
- }
- #endif /* _M_IX86 */
- /*-------------------------------------------------------------------------*/
- void window(float *vbuf, int vb_ptr, short *pcm)
- {
- int i, j;
- int si, bx;
- const float *coef;
- float sum;
- si = vb_ptr + 16;
- bx = (si+32) & 511;
- coef = wincoef;
- /*-- first 16 --*/
- for(i=0;i<16;i++) {
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[si];
- si = (si+64) & 511;
- sum -= (*coef++)*vbuf[bx];
- bx = (bx+64) & 511;
- }
- si++;
- bx--;
- *pcm++ = RoundFtoS(sum) ;
- }
- /*-- special case --*/
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[bx];
- bx = (bx+64) & 511;
- }
- *pcm++ = RoundFtoS(sum) ;
- /*-- last 15 --*/
- coef = wincoef + 255; /* back pass through coefs */
- for(i=0;i<15;i++) {
- si--;
- bx++;
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef--)*vbuf[si];
- si = (si+64) & 511;
- sum += (*coef--)*vbuf[bx];
- bx = (bx+64) & 511;
- }
- *pcm++ = RoundFtoS(sum) ;
- }
- }
- /*------------------------------------------------------------*/
- void window_dual(float *vbuf, int vb_ptr, short *pcm)
- {
- int i, j; /* dual window interleaves output */
- int si, bx;
- const float *coef;
- float sum;
- si = vb_ptr + 16;
- bx = (si+32) & 511;
- coef = wincoef;
- /*-- first 16 --*/
- for(i=0;i<16;i++) {
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[si];
- si = (si+64) & 511;
- sum -= (*coef++)*vbuf[bx];
- bx = (bx+64) & 511;
- }
- si++;
- bx--;
- *pcm = RoundFtoS(sum) ;
- pcm += 2;
- }
- /*-- special case --*/
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[bx];
- bx = (bx+64) & 511;
- }
- *pcm = RoundFtoS(sum) ;
- pcm += 2;
- /*-- last 15 --*/
- coef = wincoef + 255; /* back pass through coefs */
- for(i=0;i<15;i++) {
- si--;
- bx++;
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef--)*vbuf[si];
- si = (si+64) & 511;
- sum += (*coef--)*vbuf[bx];
- bx = (bx+64) & 511;
- }
- *pcm = RoundFtoS(sum) ;
- pcm += 2;
- }
- }
- /*------------------------------------------------------------*/
- #ifdef REDUCTION
- /*------------------------------------------------------------*/
- /*------------------- 16 pt window ------------------------------*/
- void window16(float *vbuf, int vb_ptr, short *pcm)
- {
- int i, j;
- unsigned char si, bx;
- float *coef;
- float sum;
- long tmp;
- si = vb_ptr + 8;
- bx = si+16;
- coef = wincoef;
- /*-- first 8 --*/
- for(i=0;i<8;i++) {
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[si];
- si += 32;
- sum -= (*coef++)*vbuf[bx];
- bx += 32;
- }
- si++;
- bx--;
- coef+=16;
- *pcm++ = RoundFtoS(sum) ;
- }
- /*-- special case --*/
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[bx];
- bx += 32;
- }
- *pcm++ = RoundFtoS(sum) ;
- /*-- last 7 --*/
- coef = wincoef + 255; /* back pass through coefs */
- for(i=0;i<7;i++) {
- coef-=16;
- si--;
- bx++;
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef--)*vbuf[si];
- si +=32;
- sum += (*coef--)*vbuf[bx];
- bx +=32;
- }
- *pcm++ = RoundFtoS(sum) ;
- }
- }
- /*--------------- 16 pt dual window (interleaved output) -----------------*/
- void window16_dual(float *vbuf, int vb_ptr, short *pcm)
- {
- int i, j;
- unsigned char si, bx;
- float *coef;
- float sum;
- long tmp;
- si = vb_ptr + 8;
- bx = si+16;
- coef = wincoef;
- /*-- first 8 --*/
- for(i=0;i<8;i++) {
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[si];
- si += 32;
- sum -= (*coef++)*vbuf[bx];
- bx += 32;
- }
- si++;
- bx--;
- coef+=16;
- *pcm = RoundFtoS(sum) ;
- pcm+=2;
- }
- /*-- special case --*/
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[bx];
- bx += 32;
- }
- *pcm = RoundFtoS(sum) ;
- pcm+=2;
- /*-- last 7 --*/
- coef = wincoef + 255; /* back pass through coefs */
- for(i=0;i<7;i++) {
- coef-=16;
- si--;
- bx++;
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef--)*vbuf[si];
- si +=32;
- sum += (*coef--)*vbuf[bx];
- bx +=32;
- }
- *pcm = RoundFtoS(sum) ;
- pcm+=2;
- }
- }
- /*------------------- 8 pt window ------------------------------*/
- void window8(float *vbuf, int vb_ptr, short *pcm)
- {
- int i, j;
- int si, bx;
- float *coef;
- float sum;
- long tmp;
- si = vb_ptr + 4;
- bx = (si+8)&127;
- coef = wincoef;
- /*-- first 4 --*/
- for(i=0;i<4;i++) {
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[si];
- si = (si+16) & 127;
- sum -= (*coef++)*vbuf[bx];
- bx = (bx+16) & 127;
- }
- si++;
- bx--;
- coef+=48;
- *pcm++ = RoundFtoS(sum) ;
- }
- /*-- special case --*/
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[bx];
- bx = (bx+16) & 127;
- }
- *pcm++ = RoundFtoS(sum) ;
- /*-- last 3 --*/
- coef = wincoef + 255; /* back pass through coefs */
- for(i=0;i<3;i++) {
- coef-=48;
- si--;
- bx++;
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef--)*vbuf[si];
- si = (si+16) & 127;
- sum += (*coef--)*vbuf[bx];
- bx = (bx+16) & 127;
- }
- *pcm++ = RoundFtoS(sum) ;
- }
- }
- /*--------------- 8 pt dual window (interleaved output) -----------------*/
- void window8_dual(float *vbuf, int vb_ptr, short *pcm)
- {
- int i, j;
- int si, bx;
- float *coef;
- float sum;
- long tmp;
- si = vb_ptr + 4;
- bx = (si+8) & 127;
- coef = wincoef;
- /*-- first 4 --*/
- for(i=0;i<4;i++) {
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[si];
- si = (si+16) & 127;
- sum -= (*coef++)*vbuf[bx];
- bx = (bx+16) & 127;
- }
- si++;
- bx--;
- coef+=48;
- *pcm = RoundFtoS(sum) ;
- pcm+=2;
- }
- /*-- special case --*/
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef++)*vbuf[bx];
- bx = (bx+16) & 127;
- }
- *pcm = RoundFtoS(sum) ;
- pcm+=2;
- /*-- last 3 --*/
- coef = wincoef + 255; /* back pass through coefs */
- for(i=0;i<3;i++) {
- coef-=48;
- si--;
- bx++;
- sum = 0.0F;
- for(j=0;j<8;j++) {
- sum += (*coef--)*vbuf[si];
- si = (si+16) & 127;
- sum += (*coef--)*vbuf[bx];
- bx = (bx+16) & 127;
- }
- *pcm = RoundFtoS(sum) ;
- pcm+=2;
- }
- }
- /*------------------------------------------------------------*/
- #endif // end reduction