1 /* Copyright (C) 2010-2020 The RetroArch team
3 * ---------------------------------------------------------------------------------------
4 * The following license statement only applies to this file (echo.c).
5 * ---------------------------------------------------------------------------------------
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:
13 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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.
27 #include <retro_miscellaneous.h>
28 #include <libretro_dspfilter.h>
36 static void delta_free(void *data)
41 static void delta_process(void *data, struct dspfilter_output *output,
42 const struct dspfilter_input *input)
45 struct delta_data *d = (struct delta_data*)data;
46 float *out = output->samples;
47 output->samples = input->samples;
48 output->frames = input->frames;
50 for (i = 0; i < input->frames; i++)
52 for (c = 0; c < 2; c++)
55 *out++ = current + (current - d->old[c]) * d->intensity;
61 static void *delta_init(const struct dspfilter_info *info,
62 const struct dspfilter_config *config, void *userdata)
64 struct delta_data *d = (struct delta_data*)calloc(1, sizeof(*d));
67 config->get_float(userdata, "intensity", &d->intensity, 5.0f);
71 static const struct dspfilter_implementation delta_plug = {
75 DSPFILTER_API_VERSION,
80 #ifdef HAVE_FILTERS_BUILTIN
81 #define dspfilter_get_implementation delta_dspfilter_get_implementation
84 const struct dspfilter_implementation *dspfilter_get_implementation(dspfilter_simd_mask_t mask)
89 #undef dspfilter_get_implementation