core.c
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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 ***** */
- /*
- * Fixed-point sampling rate conversion library
- * Developed by Ken Cooke (kenc@real.com)
- * May 2003
- *
- * Core filtering functions, generic version.
- * This version is fairly optimized for ARMv4.
- */
- #include "core.h"
- #if defined (_M_IX86) || (defined (_SYMBIAN) && defined (__WINS__))
- __inline int MULHI(int a, int b) {
- __asm mov eax, a
- __asm imul b
- __asm mov eax, edx
- }
- #elif defined (__CC_ARM)
- __inline int MULHI(int a, int b) {
- int low;
- __asm { smull low, a, b, a }
- return a;
- }
- #else
- /* a fast MULHI is important, so verify this compiles well */
- #define MULHI(a,b) ((int)(((__int64)(a) * (__int64)(b)) >> 32))
- #endif
- short *
- RATCoreMono(short *pcmptr, short *pcmend, short *outptr, state_t *s)
- {
- short *rwgptr, *lwgptr, *revptr;
- int acc;
- int i, sign;
- int *tab;
- rwgptr = s->rwing;
- lwgptr = s->lwing;
- pcmptr += s->offset;
- while (pcmptr < pcmend) {
- revptr = pcmptr - 1;
- acc = 1 << 14;
- /* FIR filter */
- for (i = s->nwing >> 1; i != 0; i--) {
- acc += (*pcmptr++) * (*lwgptr++);
- acc += (*pcmptr++) * (*lwgptr++);
- acc += (*revptr--) * (*rwgptr++);
- acc += (*revptr--) * (*rwgptr++);
- }
- if (s->nwing & 0x1) {
- acc += (*pcmptr++) * (*lwgptr++);
- acc += (*revptr--) * (*rwgptr++);
- }
- acc >>= 15;
- /* saturate */
- if ((sign = (acc >> 31)) != (acc >> 15))
- acc = sign ^ ((1<<15)-1);
- *outptr++ = (short) acc;
- /* step phase by N */
- tab = (rwgptr > s->stepNptr ? s->stepNbak : s->stepNfwd);
- rwgptr += tab[0];
- lwgptr += tab[1];
- pcmptr += tab[2];
- }
- s->offset = pcmptr - pcmend;
- s->rwing = rwgptr;
- s->lwing = lwgptr;
- return outptr;
- }
- short *
- RATCoreStereo(short *pcmptr, short *pcmend, short *outptr, state_t *s)
- {
- short *rwgptr, *lwgptr, *revptr;
- int acc0, acc1;
- int i, sign;
- int *tab;
- rwgptr = s->rwing;
- lwgptr = s->lwing;
- pcmptr += s->offset;
- while (pcmptr+1 < pcmend) {
- revptr = pcmptr - 1;
- acc0 = acc1 = 1 << 14;
- /* FIR filter */
- for (i = s->nwing >> 1; i != 0; i--) {
- acc0 += (*pcmptr++) * (*lwgptr);
- acc1 += (*pcmptr++) * (*lwgptr++);
- acc0 += (*pcmptr++) * (*lwgptr);
- acc1 += (*pcmptr++) * (*lwgptr++);
- acc1 += (*revptr--) * (*rwgptr);
- acc0 += (*revptr--) * (*rwgptr++);
- acc1 += (*revptr--) * (*rwgptr);
- acc0 += (*revptr--) * (*rwgptr++);
- }
- if (s->nwing & 0x1) {
- acc0 += (*pcmptr++) * (*lwgptr);
- acc1 += (*pcmptr++) * (*lwgptr++);
- acc1 += (*revptr--) * (*rwgptr);
- acc0 += (*revptr--) * (*rwgptr++);
- }
- acc0 >>= 15;
- acc1 >>= 15;
- /* saturate */
- if ((sign = (acc0 >> 31)) != (acc0 >> 15))
- acc0 = sign ^ ((1<<15)-1);
- if ((sign = (acc1 >> 31)) != (acc1 >> 15))
- acc1 = sign ^ ((1<<15)-1);
- *outptr++ = (short) acc0;
- *outptr++ = (short) acc1;
- /* step phase by N */
- tab = (rwgptr > s->stepNptr ? s->stepNbak : s->stepNfwd);
- rwgptr += tab[0];
- lwgptr += tab[1];
- pcmptr += tab[2];
- }
- s->offset = pcmptr - pcmend;
- s->rwing = rwgptr;
- s->lwing = lwgptr;
- return outptr;
- }
- short *
- ARBCoreMono(short *pcmptr, short *pcmend, short *outptr, state_t *s)
- {
- short *rwgptr, *lwgptr, *revptr;
- short *rwgptr1, *lwgptr1;
- int acc0, acc1;
- int pcmstep, i, sign;
- int *tab;
- uint phasef;
- rwgptr = s->rwing;
- lwgptr = s->lwing;
- phasef = s->phasef;
- pcmptr += s->offset;
- /* phase+1 */
- tab = (rwgptr >= s->step1ptr ? s->step1bak : s->step1fwd);
- rwgptr1 = rwgptr + tab[0];
- lwgptr1 = lwgptr + tab[1];
- pcmstep = tab[2];
- while (pcmptr+pcmstep < pcmend) {
- revptr = pcmptr - 1;
- acc0 = acc1 = 1 << 14;
- if (!pcmstep) {
- for (i = s->nwing; i != 0; i--) {
- register short pcm, rev;
- pcm = (*pcmptr++);
- rev = (*revptr--);
- acc0 += pcm * (*lwgptr++);
- acc1 += pcm * (*lwgptr1++);
- acc0 += rev * (*rwgptr++);
- acc1 += rev * (*rwgptr1++);
- }
- } else {
- for (i = s->nwing; i != 0; i--) {
- register short pcm0, pcm1;
- pcm0 = (*pcmptr++);
- pcm1 = *(pcmptr+0);
- acc0 += pcm0 * (*lwgptr++);
- acc1 += pcm1 * (*lwgptr1++);
- pcm1 = *(revptr+1);
- pcm0 = (*revptr--);
- acc0 += pcm0 * (*rwgptr++);
- acc1 += pcm1 * (*rwgptr1++);
- }
- }
- /* interpolate */
- acc0 = (acc0 >> 1) + MULHI(acc1 - acc0, phasef >> 1);
- acc0 >>= 14;
- /* saturate */
- if ((sign = (acc0 >> 31)) != (acc0 >> 15))
- acc0 = sign ^ ((1<<15)-1);
- *outptr++ = (short) acc0;
- /* step phase fraction */
- phasef += s->stepf;
- if (phasef < s->stepf) {
- rwgptr = rwgptr1;
- lwgptr = lwgptr1;
- pcmptr += pcmstep;
- }
- /* step phase by N */
- tab = (rwgptr > s->stepNptr ? s->stepNbak : s->stepNfwd);
- rwgptr += tab[0];
- lwgptr += tab[1];
- pcmptr += tab[2];
- /* phase+1 */
- tab = (rwgptr >= s->step1ptr ? s->step1bak : s->step1fwd);
- rwgptr1 = rwgptr + tab[0];
- lwgptr1 = lwgptr + tab[1];
- pcmstep = tab[2];
- }
- s->offset = pcmptr - pcmend;
- s->rwing = rwgptr;
- s->lwing = lwgptr;
- s->phasef = phasef;
- return outptr;
- }
- short *
- ARBCoreStereo(short *pcmptr, short *pcmend, short *outptr, state_t *s)
- {
- register short *rwgptr, *lwgptr, *revptr;
- register short *rwgptr1, *lwgptr1;
- register int acc0, acc1, acc2, acc3;
- int pcmstep, i, sign;
- int *tab;
- uint phasef;
- rwgptr = s->rwing;
- lwgptr = s->lwing;
- phasef = s->phasef;
- pcmptr += s->offset;
- /* phase+1 */
- tab = (rwgptr >= s->step1ptr ? s->step1bak : s->step1fwd);
- rwgptr1 = rwgptr + tab[0];
- lwgptr1 = lwgptr + tab[1];
- pcmstep = tab[2];
- while (pcmptr+pcmstep+1 < pcmend) {
- revptr = pcmptr - 1;
- acc0 = acc1 = acc2 = acc3 = 1 << 14;
- if (!pcmstep) {
- for (i = s->nwing; i != 0; i--) {
- register short pcm0, pcm1;
- pcm0 = (*pcmptr++);
- pcm1 = (*pcmptr++);
- acc0 += pcm0 * (*lwgptr);
- acc1 += pcm1 * (*lwgptr++);
- acc2 += pcm0 * (*lwgptr1);
- acc3 += pcm1 * (*lwgptr1++);
- pcm1 = (*revptr--);
- pcm0 = (*revptr--);
- acc3 += pcm1 * (*rwgptr1);
- acc2 += pcm0 * (*rwgptr1++);
- acc1 += pcm1 * (*rwgptr);
- acc0 += pcm0 * (*rwgptr++);
- }
- } else {
- for (i = s->nwing; i != 0; i--) {
- acc0 += (*pcmptr++) * (*lwgptr);
- acc1 += (*pcmptr++) * (*lwgptr++);
- acc2 += *(pcmptr+0) * (*lwgptr1);
- acc3 += *(pcmptr+1) * (*lwgptr1++);
- acc3 += *(revptr+2) * (*rwgptr1);
- acc2 += *(revptr+1) * (*rwgptr1++);
- acc1 += (*revptr--) * (*rwgptr);
- acc0 += (*revptr--) * (*rwgptr++);
- }
- }
- /* interpolate */
- acc0 = (acc0 >> 1) + MULHI(acc2 - acc0, phasef >> 1);
- acc0 >>= 14;
- acc1 = (acc1 >> 1) + MULHI(acc3 - acc1, phasef >> 1);
- acc1 >>= 14;
- /* saturate */
- if ((sign = (acc0 >> 31)) != (acc0 >> 15))
- acc0 = sign ^ ((1<<15)-1);
- if ((sign = (acc1 >> 31)) != (acc1 >> 15))
- acc1 = sign ^ ((1<<15)-1);
- *outptr++ = (short) acc0;
- *outptr++ = (short) acc1;
- /* step phase fraction */
- phasef += s->stepf;
- if (phasef < s->stepf) {
- rwgptr = rwgptr1;
- lwgptr = lwgptr1;
- pcmptr += pcmstep;
- }
- /* step phase by N */
- tab = (rwgptr > s->stepNptr ? s->stepNbak : s->stepNfwd);
- rwgptr += tab[0];
- lwgptr += tab[1];
- pcmptr += tab[2];
- /* phase+1 */
- tab = (rwgptr >= s->step1ptr ? s->step1bak : s->step1fwd);
- rwgptr1 = rwgptr + tab[0];
- lwgptr1 = lwgptr + tab[1];
- pcmstep = tab[2];
- }
- s->offset = pcmptr - pcmend;
- s->rwing = rwgptr;
- s->lwing = lwgptr;
- s->phasef = phasef;
- return outptr;
- }