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1 /*-
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2 * Copyright (c) 2005 Boris Mikhaylov
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be
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13 * included in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #ifndef BS2B_H
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25 #define BS2B_H
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26
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27 /* Number of crossfeed levels */
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28 #define BS2B_CLEVELS 3
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29
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30 /* Normal crossfeed levels */
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31 #define BS2B_HIGH_CLEVEL 3
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32 #define BS2B_MIDDLE_CLEVEL 2
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33 #define BS2B_LOW_CLEVEL 1
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34
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35 /* Easy crossfeed levels */
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36 #define BS2B_HIGH_ECLEVEL BS2B_HIGH_CLEVEL + BS2B_CLEVELS
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37 #define BS2B_MIDDLE_ECLEVEL BS2B_MIDDLE_CLEVEL + BS2B_CLEVELS
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38 #define BS2B_LOW_ECLEVEL BS2B_LOW_CLEVEL + BS2B_CLEVELS
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39
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40 /* Default crossfeed levels */
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41 #define BS2B_DEFAULT_CLEVEL BS2B_HIGH_ECLEVEL
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42 /* Default sample rate (Hz) */
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43 #define BS2B_DEFAULT_SRATE 44100
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44
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45 #ifdef __cplusplus
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46 extern "C" {
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47 #endif /* __cplusplus */
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48
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49 struct bs2b {
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50 int level; /* Crossfeed level */
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51 int srate; /* Sample rate (Hz) */
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52
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53 /* Lowpass IIR filter coefficients */
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54 double a0_lo;
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55 double b1_lo;
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56
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57 /* Highboost IIR filter coefficients */
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58 double a0_hi;
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59 double a1_hi;
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60 double b1_hi;
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61
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62 /* Global gain against overloading */
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63 double gain;
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64
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65 /* Buffer of last filtered sample.
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66 * [0] - first channel, [1] - second channel
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67 */
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68 struct t_last_sample {
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69 double asis[2];
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70 double lo[2];
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71 double hi[2];
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72 } last_sample;
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73 };
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74
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75 /* Clear buffers and set new coefficients with new crossfeed level value.
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76 * level - crossfeed level of *LEVEL values.
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77 */
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78 void bs2b_set_level(struct bs2b *bs2b, int level);
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79
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80 /* Return current crossfeed level value */
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81 int bs2b_get_level(struct bs2b *bs2b);
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82
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83 /* Clear buffers and set new coefficients with new sample rate value.
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84 * srate - sample rate by Hz.
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85 */
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86 void bs2b_set_srate(struct bs2b *bs2b, int srate);
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87
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88 /* Return current sample rate value */
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89 int bs2b_get_srate(struct bs2b *bs2b);
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90
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91 /* Clear buffer */
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92 void bs2b_clear(struct bs2b *bs2b);
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93
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94 /* Return 1 if buffer is clear */
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95 int bs2b_is_clear(struct bs2b *bs2b);
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96
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97 /* Crossfeeds one stereo sample that are pointed by sample.
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98 * [0] - first channel, [1] - second channel.
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99 * Returns crossfided samle by sample pointer.
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100 */
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101
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102 /* sample poits to floats */
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103 void bs2b_cross_feed(struct bs2b *bs2b, float *sample);
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104
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105 #ifdef __cplusplus
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106 } /* extern "C" */
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107 #endif /* __cplusplus */
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108
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109 #endif /* BS2B_H */
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