| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (nearest_resampler.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdint.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <math.h> |
| 26 | |
| 27 | #include <audio/audio_resampler.h> |
| 28 | |
| 29 | typedef struct rarch_nearest_resampler |
| 30 | { |
| 31 | float fraction; |
| 32 | } rarch_nearest_resampler_t; |
| 33 | |
| 34 | static void resampler_nearest_process( |
| 35 | void *re_, struct resampler_data *data) |
| 36 | { |
| 37 | rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)re_; |
| 38 | audio_frame_float_t *inp = (audio_frame_float_t*)data->data_in; |
| 39 | audio_frame_float_t *inp_max = (audio_frame_float_t*)inp + data->input_frames; |
| 40 | audio_frame_float_t *outp = (audio_frame_float_t*)data->data_out; |
| 41 | float ratio = 1.0 / data->ratio; |
| 42 | |
| 43 | while (inp != inp_max) |
| 44 | { |
| 45 | while (re->fraction > 1) |
| 46 | { |
| 47 | *outp++ = *inp; |
| 48 | re->fraction -= ratio; |
| 49 | } |
| 50 | re->fraction++; |
| 51 | inp++; |
| 52 | } |
| 53 | |
| 54 | data->output_frames = (outp - (audio_frame_float_t*)data->data_out); |
| 55 | } |
| 56 | |
| 57 | static void resampler_nearest_free(void *re_) |
| 58 | { |
| 59 | rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)re_; |
| 60 | if (re) |
| 61 | free(re); |
| 62 | } |
| 63 | |
| 64 | static void *resampler_nearest_init(const struct resampler_config *config, |
| 65 | double bandwidth_mod, |
| 66 | enum resampler_quality quality, |
| 67 | resampler_simd_mask_t mask) |
| 68 | { |
| 69 | rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*) |
| 70 | calloc(1, sizeof(rarch_nearest_resampler_t)); |
| 71 | if (!re) |
| 72 | return NULL; |
| 73 | re->fraction = 0; |
| 74 | return re; |
| 75 | } |
| 76 | |
| 77 | retro_resampler_t nearest_resampler = { |
| 78 | resampler_nearest_init, |
| 79 | resampler_nearest_process, |
| 80 | resampler_nearest_free, |
| 81 | RESAMPLER_API_VERSION, |
| 82 | "nearest", |
| 83 | "nearest" |
| 84 | }; |