| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (audio_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 <string.h> |
| 24 | |
| 25 | #include <string/stdstring.h> |
| 26 | #include <features/features_cpu.h> |
| 27 | #include <file/config_file_userdata.h> |
| 28 | |
| 29 | #include <audio/audio_resampler.h> |
| 30 | |
| 31 | static void resampler_null_process(void *a, struct resampler_data *b) { } |
| 32 | static void resampler_null_free(void *a) { } |
| 33 | static void *resampler_null_init(const struct resampler_config *a, double b, |
| 34 | enum resampler_quality c, resampler_simd_mask_t d) { return (void*)0; } |
| 35 | |
| 36 | retro_resampler_t null_resampler = { |
| 37 | resampler_null_init, |
| 38 | resampler_null_process, |
| 39 | resampler_null_free, |
| 40 | RESAMPLER_API_VERSION, |
| 41 | "null", |
| 42 | "null" |
| 43 | }; |
| 44 | |
| 45 | static const retro_resampler_t *resampler_drivers[] = { |
| 46 | &sinc_resampler, |
| 47 | #ifdef HAVE_CC_RESAMPLER |
| 48 | &CC_resampler, |
| 49 | #endif |
| 50 | #ifdef HAVE_NEAREST_RESAMPLER |
| 51 | &nearest_resampler, |
| 52 | #endif |
| 53 | &null_resampler, |
| 54 | NULL, |
| 55 | }; |
| 56 | |
| 57 | static const struct resampler_config resampler_config = { |
| 58 | config_userdata_get_float, |
| 59 | config_userdata_get_int, |
| 60 | config_userdata_get_float_array, |
| 61 | config_userdata_get_int_array, |
| 62 | config_userdata_get_string, |
| 63 | config_userdata_free, |
| 64 | }; |
| 65 | |
| 66 | /** |
| 67 | * find_resampler_driver_index: |
| 68 | * @ident : Identifier of resampler driver to find. |
| 69 | * |
| 70 | * Finds resampler driver index by @ident name. |
| 71 | * |
| 72 | * Returns: resampler driver index if resampler driver was found, otherwise |
| 73 | * -1. |
| 74 | **/ |
| 75 | static int find_resampler_driver_index(const char *ident) |
| 76 | { |
| 77 | unsigned i; |
| 78 | |
| 79 | for (i = 0; resampler_drivers[i]; i++) |
| 80 | if (string_is_equal_noncase(ident, resampler_drivers[i]->ident)) |
| 81 | return i; |
| 82 | return -1; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * find_resampler_driver: |
| 87 | * @ident : Identifier of resampler driver to find. |
| 88 | * |
| 89 | * Finds resampler by @ident name. |
| 90 | * |
| 91 | * Returns: resampler driver if resampler driver was found, otherwise |
| 92 | * NULL. |
| 93 | **/ |
| 94 | static const retro_resampler_t *find_resampler_driver(const char *ident) |
| 95 | { |
| 96 | int i = find_resampler_driver_index(ident); |
| 97 | |
| 98 | if (i >= 0) |
| 99 | return resampler_drivers[i]; |
| 100 | |
| 101 | return resampler_drivers[0]; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * resampler_append_plugs: |
| 106 | * @re : Resampler handle |
| 107 | * @backend : Resampler backend that is about to be set. |
| 108 | * @bw_ratio : Bandwidth ratio. |
| 109 | * |
| 110 | * Initializes resampler driver based on queried CPU features. |
| 111 | * |
| 112 | * Returns: true (1) if successfully initialized, otherwise false (0). |
| 113 | **/ |
| 114 | static bool resampler_append_plugs(void **re, |
| 115 | const retro_resampler_t **backend, |
| 116 | enum resampler_quality quality, |
| 117 | double bw_ratio) |
| 118 | { |
| 119 | resampler_simd_mask_t mask = (resampler_simd_mask_t)cpu_features_get(); |
| 120 | |
| 121 | if (*backend) |
| 122 | *re = (*backend)->init(&resampler_config, bw_ratio, quality, mask); |
| 123 | |
| 124 | if (!*re) |
| 125 | return false; |
| 126 | return true; |
| 127 | } |
| 128 | |
| 129 | |
| 130 | /** |
| 131 | * audio_resampler_driver_find_handle: |
| 132 | * @idx : index of driver to get handle to. |
| 133 | * |
| 134 | * Returns: handle to audio resampler driver at index. Can be NULL |
| 135 | * if nothing found. |
| 136 | **/ |
| 137 | const void *audio_resampler_driver_find_handle(int idx) |
| 138 | { |
| 139 | const void *drv = resampler_drivers[idx]; |
| 140 | if (!drv) |
| 141 | return NULL; |
| 142 | return drv; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * audio_resampler_driver_find_ident: |
| 147 | * @idx : index of driver to get handle to. |
| 148 | * |
| 149 | * Returns: Human-readable identifier of audio resampler driver at index. |
| 150 | * Can be NULL if nothing found. |
| 151 | **/ |
| 152 | const char *audio_resampler_driver_find_ident(int idx) |
| 153 | { |
| 154 | const retro_resampler_t *drv = resampler_drivers[idx]; |
| 155 | if (!drv) |
| 156 | return NULL; |
| 157 | return drv->ident; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * retro_resampler_realloc: |
| 162 | * @re : Resampler handle |
| 163 | * @backend : Resampler backend that is about to be set. |
| 164 | * @ident : Identifier name for resampler we want. |
| 165 | * @bw_ratio : Bandwidth ratio. |
| 166 | * |
| 167 | * Reallocates resampler. Will free previous handle before |
| 168 | * allocating a new one. If ident is NULL, first resampler will be used. |
| 169 | * |
| 170 | * Returns: true (1) if successful, otherwise false (0). |
| 171 | **/ |
| 172 | bool retro_resampler_realloc(void **re, const retro_resampler_t **backend, |
| 173 | const char *ident, enum resampler_quality quality, double bw_ratio) |
| 174 | { |
| 175 | if (*re && *backend) |
| 176 | (*backend)->free(*re); |
| 177 | |
| 178 | *re = NULL; |
| 179 | *backend = find_resampler_driver(ident); |
| 180 | |
| 181 | if (!resampler_append_plugs(re, backend, quality, bw_ratio)) |
| 182 | { |
| 183 | if (!*re) |
| 184 | *backend = NULL; |
| 185 | return false; |
| 186 | } |
| 187 | |
| 188 | return true; |
| 189 | } |