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  1. /*
  2.  * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <math.h>
  22. #include <stdint.h>
  23.  
  24. #include "libavutil/common.h"
  25. #include "internal.h"
  26.  
  27. #if defined(CONFIG_RESAMPLE_DBL)
  28. #define SET_TYPE(func)  func ## _dbl
  29. #define FELEM         double
  30. #define FELEM2        double
  31. #define FELEML        double
  32. #define OUT(d, v) d = v
  33. #define DBL_TO_FELEM(d, v) d = v
  34. #elif defined(CONFIG_RESAMPLE_FLT)
  35. #define SET_TYPE(func)  func ## _flt
  36. #define FELEM         float
  37. #define FELEM2        float
  38. #define FELEML        float
  39. #define OUT(d, v) d = v
  40. #define DBL_TO_FELEM(d, v) d = v
  41. #elif defined(CONFIG_RESAMPLE_S32)
  42. #define SET_TYPE(func)  func ## _s32
  43. #define FELEM         int32_t
  44. #define FELEM2        int64_t
  45. #define FELEML        int64_t
  46. #define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
  47. #define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
  48. #else
  49. #define SET_TYPE(func)  func ## _s16
  50. #define FELEM         int16_t
  51. #define FELEM2        int32_t
  52. #define FELEML        int64_t
  53. #define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
  54. #define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
  55. #endif
  56.  
  57. static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index)
  58. {
  59.     FELEM *dst = dst0;
  60.     const FELEM *src = src0;
  61.     dst[dst_index] = src[index];
  62. }
  63.  
  64. static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index,
  65.                                       const void *src0, unsigned int index, int frac)
  66. {
  67.     FELEM *dst = dst0;
  68.     const FELEM *src = src0;
  69.     int i;
  70.     unsigned int sample_index = index >> c->phase_shift;
  71.     FELEM2 val = 0;
  72.     FELEM *filter = ((FELEM *)c->filter_bank) +
  73.                     c->filter_length * (index & c->phase_mask);
  74.     FELEM2 v2 = 0;
  75.  
  76.     for (i = 0; i < c->filter_length; i++) {
  77.         val += src[sample_index + i] * (FELEM2)filter[i];
  78.         v2  += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];
  79.     }
  80.     val += (v2 - val) * (FELEML)frac / c->src_incr;
  81.  
  82.     OUT(dst[dst_index], val);
  83. }
  84.  
  85. static void SET_TYPE(resample_one)(ResampleContext *c,
  86.                                    void *dst0, int dst_index, const void *src0,
  87.                                    unsigned int index, int frac)
  88. {
  89.     FELEM *dst = dst0;
  90.     const FELEM *src = src0;
  91.     int i;
  92.     unsigned int sample_index = index >> c->phase_shift;
  93.     FELEM2 val = 0;
  94.     FELEM *filter = ((FELEM *)c->filter_bank) +
  95.                     c->filter_length * (index & c->phase_mask);
  96.  
  97.     for (i = 0; i < c->filter_length; i++)
  98.         val += src[sample_index + i] * (FELEM2)filter[i];
  99.  
  100.     OUT(dst[dst_index], val);
  101. }
  102.  
  103. static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
  104.                                  int tap_count)
  105. {
  106.     int i;
  107.     FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
  108.     for (i = 0; i < tap_count; i++) {
  109.         DBL_TO_FELEM(filter[i], tab[i]);
  110.     }
  111. }
  112.  
  113. #undef SET_TYPE
  114. #undef FELEM
  115. #undef FELEM2
  116. #undef FELEML
  117. #undef OUT
  118. #undef DBL_TO_FELEM
  119.