yading@11: /*
yading@11:  * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #if defined(CONFIG_RESAMPLE_DBL)
yading@11: #define SET_TYPE(func)  func ## _dbl
yading@11: #define FELEM         double
yading@11: #define FELEM2        double
yading@11: #define FELEML        double
yading@11: #define OUT(d, v) d = v
yading@11: #define DBL_TO_FELEM(d, v) d = v
yading@11: #elif defined(CONFIG_RESAMPLE_FLT)
yading@11: #define SET_TYPE(func)  func ## _flt
yading@11: #define FELEM         float
yading@11: #define FELEM2        float
yading@11: #define FELEML        float
yading@11: #define OUT(d, v) d = v
yading@11: #define DBL_TO_FELEM(d, v) d = v
yading@11: #elif defined(CONFIG_RESAMPLE_S32)
yading@11: #define SET_TYPE(func)  func ## _s32
yading@11: #define FELEM         int32_t
yading@11: #define FELEM2        int64_t
yading@11: #define FELEML        int64_t
yading@11: #define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
yading@11: #define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
yading@11: #else
yading@11: #define SET_TYPE(func)  func ## _s16
yading@11: #define FELEM         int16_t
yading@11: #define FELEM2        int32_t
yading@11: #define FELEML        int64_t
yading@11: #define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
yading@11: #define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
yading@11: #endif
yading@11: 
yading@11: static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
yading@11:                                    void *dst0, int dst_index, const void *src0,
yading@11:                                    int src_size, int index, int frac)
yading@11: {
yading@11:     FELEM *dst = dst0;
yading@11:     const FELEM *src = src0;
yading@11: 
yading@11:     if (no_filter) {
yading@11:         dst[dst_index] = src[index];
yading@11:     } else {
yading@11:         int i;
yading@11:         int sample_index = index >> c->phase_shift;
yading@11:         FELEM2 val = 0;
yading@11:         FELEM *filter = ((FELEM *)c->filter_bank) +
yading@11:                         c->filter_length * (index & c->phase_mask);
yading@11: 
yading@11:         if (sample_index < 0) {
yading@11:             for (i = 0; i < c->filter_length; i++)
yading@11:                 val += src[FFABS(sample_index + i) % src_size] *
yading@11:                        (FELEM2)filter[i];
yading@11:         } else if (c->linear) {
yading@11:             FELEM2 v2 = 0;
yading@11:             for (i = 0; i < c->filter_length; i++) {
yading@11:                 val += src[abs(sample_index + i)] * (FELEM2)filter[i];
yading@11:                 v2  += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length];
yading@11:             }
yading@11:             val += (v2 - val) * (FELEML)frac / c->src_incr;
yading@11:         } else {
yading@11:             for (i = 0; i < c->filter_length; i++)
yading@11:                 val += src[sample_index + i] * (FELEM2)filter[i];
yading@11:         }
yading@11: 
yading@11:         OUT(dst[dst_index], val);
yading@11:     }
yading@11: }
yading@11: 
yading@11: static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
yading@11:                                  int tap_count)
yading@11: {
yading@11:     int i;
yading@11:     FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
yading@11:     for (i = 0; i < tap_count; i++) {
yading@11:         DBL_TO_FELEM(filter[i], tab[i]);
yading@11:     }
yading@11: }
yading@11: 
yading@11: #undef SET_TYPE
yading@11: #undef FELEM
yading@11: #undef FELEM2
yading@11: #undef FELEML
yading@11: #undef OUT
yading@11: #undef DBL_TO_FELEM