/* * Copyright (c) 2012 *      MIPS Technologies, Inc., California. * * 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 MIPS Technologies, Inc., 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 MIPS TECHNOLOGIES, INC. ``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 MIPS TECHNOLOGIES, INC. 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. * * Author:  Nedeljko Babic (nedeljko.babic imgtec com) * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "common.h"#include "fixed_dsp.h"#include "mem.h" static void vector_fmul_add_c(int *dst, const int *src0, const int *src1, const int *src2, int len){    int i;    int64_t accu;     for (i=0; i<len; i++) {        accu = (int64_t)src0[i] * src1[i];        dst[i] = src2[i] + (int)((accu + 0x40000000) >> 31);    }} static void vector_fmul_reverse_c(int *dst, const int *src0, const int *src1, int len){    int i;    int64_t accu;     src1 += len-1;    for (i=0; i<len; i++) {        accu = (int64_t)src0[i] * src1[-i];        dst[i] = (int)((accu+0x40000000) >> 31);    }} static void vector_fmul_window_scaled_c(int16_t *dst, const int32_t *src0,                                       const int32_t *src1, const int32_t *win,                                       int len, uint8_t bits){    int32_t s0, s1, wi, wj, i,j, round;     dst += len;    win += len;    src0+= len;    round = bits? 1 << (bits-1) : 0;     for (i=-len, j=len-1; i<0; i++, j--) {        s0 = src0[i];        s1 = src1[j];        wi = win[i];        wj = win[j];        dst[i] = av_clip_int16(((((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31) + round) >> bits);        dst[j] = av_clip_int16(((((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31) + round) >> bits);    }} static void vector_fmul_window_c(int32_t *dst, const int32_t *src0,                                       const int32_t *src1, const int32_t *win,                                       int len){    int32_t s0, s1, wi, wj, i, j;     dst += len;    win += len;    src0+= len;     for (i=-len, j=len-1; i<0; i++, j--) {        s0 = src0[i];        s1 = src1[j];        wi = win[i];        wj = win[j];        dst[i] = ((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31;        dst[j] = ((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31;    }} static void vector_fmul_c(int *dst, const int *src0, const int *src1, int len){    int i;    int64_t accu;     for (i = 0; i < len; i++){        accu = (int64_t)src0[i] * src1[i];        dst[i] = (int)((accu+0x40000000) >> 31);    }} static int scalarproduct_fixed_c(const int *v1, const int *v2, int len){    /** p is initialized with 0x40000000 so that the proper rounding will occur      * at the end */    int64_t p = 0x40000000;    int i;     for (i = 0; i < len; i++)        p += (int64_t)v1[i] * v2[i];     return (int)(p >> 31);} static void butterflies_fixed_c(int *restrict v1s, int *restrict v2, int len){    int i;    unsigned int *v1 = v1s;     for (i = 0; i < len; i++){        int t = v1[i] - v2[i];        v1[i] += v2[i];        v2[i] = t;    }} AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact){    AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext));     if (!fdsp)        return NULL;     fdsp->vector_fmul_window_scaled = vector_fmul_window_scaled_c;    fdsp->vector_fmul_window = vector_fmul_window_c;    fdsp->vector_fmul = vector_fmul_c;    fdsp->vector_fmul_add = vector_fmul_add_c;    fdsp->vector_fmul_reverse = vector_fmul_reverse_c;    fdsp->butterflies_fixed = butterflies_fixed_c;    fdsp->scalarproduct_fixed = scalarproduct_fixed_c; #if ARCH_RISCV    ff_fixed_dsp_init_riscv(fdsp);#elif ARCH_X86    ff_fixed_dsp_init_x86(fdsp);#endif     return fdsp;}