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Diffstat (limited to 'apps/codecs/libtta/filter.h')
-rw-r--r-- | apps/codecs/libtta/filter.h | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/apps/codecs/libtta/filter.h b/apps/codecs/libtta/filter.h deleted file mode 100644 index 228757b9a0..0000000000 --- a/apps/codecs/libtta/filter.h +++ /dev/null @@ -1,136 +0,0 @@ -/* - * filter.h - * - * Description: TTAv1 filter functions - * Developed by: Alexander Djourik <ald@true-audio.com> - * Pavel Zhilin <pzh@true-audio.com> - * - * Copyright (c) 2004 True Audio Software. All rights reserved. - * - */ - -/* - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the True Audio Software nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef FILTER_H -#define FILTER_H - -///////// Filter Settings ////////// -static int flt_set[3] = {10, 9, 10}; - -#if defined(CPU_ARM) || defined(CPU_COLDFIRE) -int hybrid_filter(fltst *fs, int *in); /* implements in filter_arm.S */ - -#else - -static inline void -memshl (register int *pA) { - register int *pB = pA + 16; - - *pA++ = *pB++; - *pA++ = *pB++; - *pA++ = *pB++; - *pA++ = *pB++; - *pA++ = *pB++; - *pA++ = *pB++; - *pA++ = *pB++; - *pA = *pB; -} - -static inline void -hybrid_filter (fltst *fs, int *in) { - register int *pA = fs->dl + fs->index; - register int *pB = fs->qm; - register int *pM = fs->dx + fs->index; - register int sum = fs->round; - - if (!fs->error) { - sum += *pA++ * *pB++; - sum += *pA++ * *pB++; - sum += *pA++ * *pB++; - sum += *pA++ * *pB++; - sum += *pA++ * *pB++; - sum += *pA++ * *pB++; - sum += *pA++ * *pB++; - sum += *pA * *pB; - pM += 8; - } else if (fs->error < 0) { - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA++ * (*pB++ -= *pM++); - sum += *pA * (*pB -= *pM++); - } else { - sum += *pA++ * (*pB++ += *pM++); - sum += *pA++ * (*pB++ += *pM++); - sum += *pA++ * (*pB++ += *pM++); - sum += *pA++ * (*pB++ += *pM++); - sum += *pA++ * (*pB++ += *pM++); - sum += *pA++ * (*pB++ += *pM++); - sum += *pA++ * (*pB++ += *pM++); - sum += *pA * (*pB += *pM++); - } - - pB = pA++; - fs->error = *in; - *in += (sum >> fs->shift); - *pA = *in; - - *pM-- = ((*pB-- >> 30) | 1) << 2; - *pM-- = ((*pB-- >> 30) | 1) << 1; - *pM-- = ((*pB-- >> 30) | 1) << 1; - *pM = ((*pB >> 30) | 1); - - *(pA-1) = *(pA-0) - *(pA-1); - *(pA-2) = *(pA-1) - *(pA-2); - *(pA-3) = *(pA-2) - *(pA-3); - - /* - * Rockbox speciffic - * in order to make speed up, memshl() is executed at the rate once every 16 times. - */ - if (++fs->index == 16) - { - memshl (fs->dl); - memshl (fs->dx); - fs->index = 0; - } -} -#endif - -static inline void -filter_init (fltst *fs, int shift) { - ci->memset (fs, 0, sizeof(fltst)); - fs->shift = shift; - fs->round = 1 << (shift - 1); - fs->index = 0; -} - -#endif /* FILTER_H */ |