/* * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> * * 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 <math.h>#include <stdint.h> #include "libavutil/common.h"#include "internal.h" #if defined(CONFIG_RESAMPLE_DBL)#define SET_TYPE(func)  func ## _dbl#define FELEM         double#define FELEM2        double#define FELEML        double#define OUT(d, v) d = v#define DBL_TO_FELEM(d, v) d = v#elif defined(CONFIG_RESAMPLE_FLT)#define SET_TYPE(func)  func ## _flt#define FELEM         float#define FELEM2        float#define FELEML        float#define OUT(d, v) d = v#define DBL_TO_FELEM(d, v) d = v#elif defined(CONFIG_RESAMPLE_S32)#define SET_TYPE(func)  func ## _s32#define FELEM         int32_t#define FELEM2        int64_t#define FELEML        int64_t#define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)#define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));#else#define SET_TYPE(func)  func ## _s16#define FELEM         int16_t#define FELEM2        int32_t#define FELEML        int64_t#define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))#endif static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index){    FELEM *dst = dst0;    const FELEM *src = src0;    dst[dst_index] = src[index];} static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index,                                      const void *src0, unsigned int index, int frac){    FELEM *dst = dst0;    const FELEM *src = src0;    int i;    unsigned int sample_index = index >> c->phase_shift;    FELEM2 val = 0;    FELEM *filter = ((FELEM *)c->filter_bank) +                    c->filter_length * (index & c->phase_mask);    FELEM2 v2 = 0;     for (i = 0; i < c->filter_length; i++) {        val += src[sample_index + i] * (FELEM2)filter[i];        v2  += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];    }    val += (v2 - val) * (FELEML)frac / c->src_incr;     OUT(dst[dst_index], val);} static void SET_TYPE(resample_one)(ResampleContext *c,                                   void *dst0, int dst_index, const void *src0,                                   unsigned int index, int frac){    FELEM *dst = dst0;    const FELEM *src = src0;    int i;    unsigned int sample_index = index >> c->phase_shift;    FELEM2 val = 0;    FELEM *filter = ((FELEM *)c->filter_bank) +                    c->filter_length * (index & c->phase_mask);     for (i = 0; i < c->filter_length; i++)        val += src[sample_index + i] * (FELEM2)filter[i];     OUT(dst[dst_index], val);} static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,                                 int tap_count){    int i;    FELEM *filter = ((FELEM *)filter0) + phase * tap_count;    for (i = 0; i < tap_count; i++) {        DBL_TO_FELEM(filter[i], tab[i]);    }} #undef SET_TYPE#undef FELEM#undef FELEM2#undef FELEML#undef OUT#undef DBL_TO_FELEM