/* * 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