/*
  * 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
  */
 
 #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_one)(ResampleContext *c, int no_filter,
                                    void *dst0, int dst_index, const void *src0,
                                    int src_size, int index, int frac)
 {
     FELEM *dst = dst0;
     const FELEM *src = src0;
 
     if (no_filter) {
         dst[dst_index] = src[index];
     } else {
         int i;
         int sample_index = index >> c->phase_shift;
         FELEM2 val = 0;
         FELEM *filter = ((FELEM *)c->filter_bank) +
                         c->filter_length * (index & c->phase_mask);
 
         if (sample_index < 0) {
             for (i = 0; i < c->filter_length; i++)
                 val += src[FFABS(sample_index + i) % src_size] *
                        (FELEM2)filter[i];
         } else if (c->linear) {
             FELEM2 v2 = 0;
             for (i = 0; i < c->filter_length; i++) {
                 val += src[abs(sample_index + i)] * (FELEM2)filter[i];
                 v2  += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length];
             }
             val += (v2 - val) * (FELEML)frac / c->src_incr;
         } else {
             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