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3719602c PC |
1 | /* Copyright (C) 2010-2020 The RetroArch team |
2 | * | |
3 | * --------------------------------------------------------------------------------------- | |
4 | * The following license statement only applies to this file (panning.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 <math.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | ||
27 | #include <libretro_dspfilter.h> | |
28 | ||
29 | struct panning_data | |
30 | { | |
31 | float left[2]; | |
32 | float right[2]; | |
33 | }; | |
34 | ||
35 | static void panning_free(void *data) | |
36 | { | |
37 | free(data); | |
38 | } | |
39 | ||
40 | static void panning_process(void *data, struct dspfilter_output *output, | |
41 | const struct dspfilter_input *input) | |
42 | { | |
43 | unsigned i; | |
44 | struct panning_data *pan = (struct panning_data*)data; | |
45 | float *out = output->samples; | |
46 | ||
47 | output->samples = input->samples; | |
48 | output->frames = input->frames; | |
49 | ||
50 | for (i = 0; i < input->frames; i++, out += 2) | |
51 | { | |
52 | float left = out[0]; | |
53 | float right = out[1]; | |
54 | out[0] = left * pan->left[0] + right * pan->left[1]; | |
55 | out[1] = left * pan->right[0] + right * pan->right[1]; | |
56 | } | |
57 | } | |
58 | ||
59 | static void *panning_init(const struct dspfilter_info *info, | |
60 | const struct dspfilter_config *config, void *userdata) | |
61 | { | |
62 | static const float default_left[] = { 1.0f, 0.0f }; | |
63 | static const float default_right[] = { 0.0f, 1.0f }; | |
64 | float *left = NULL; | |
65 | float *right = NULL; | |
66 | unsigned num_left = 0; | |
67 | unsigned num_right = 0; | |
68 | struct panning_data *pan = (struct panning_data*) | |
69 | calloc(1, sizeof(*pan)); | |
70 | ||
71 | if (!pan) | |
72 | return NULL; | |
73 | ||
74 | config->get_float_array(userdata, "left_mix", | |
75 | &left, &num_left, default_left, 2); | |
76 | config->get_float_array(userdata, "right_mix", | |
77 | &right, &num_right, default_right, 2); | |
78 | ||
79 | memcpy(pan->left, (num_left == 2) ? | |
80 | left : default_left, sizeof(pan->left)); | |
81 | memcpy(pan->right, (num_right == 2) ? | |
82 | right : default_right, sizeof(pan->right)); | |
83 | ||
84 | config->free(left); | |
85 | config->free(right); | |
86 | ||
87 | return pan; | |
88 | } | |
89 | ||
90 | static const struct dspfilter_implementation panning = { | |
91 | panning_init, | |
92 | panning_process, | |
93 | panning_free, | |
94 | ||
95 | DSPFILTER_API_VERSION, | |
96 | "Panning", | |
97 | "panning", | |
98 | }; | |
99 | ||
100 | #ifdef HAVE_FILTERS_BUILTIN | |
101 | #define dspfilter_get_implementation panning_dspfilter_get_implementation | |
102 | #endif | |
103 | ||
104 | const struct dspfilter_implementation * | |
105 | dspfilter_get_implementation(dspfilter_simd_mask_t mask) | |
106 | { | |
107 | return &panning; | |
108 | } | |
109 | ||
110 | #undef dspfilter_get_implementation |