| 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 |