[882] | 1 | //amp.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - August 2008 |
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| 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include "libroardsp.h" |
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| 26 | |
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| 27 | int roardsp_amp_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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[3001] | 28 | struct roardsp_amp * self = roar_mm_malloc(sizeof(struct roardsp_amp)); |
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[882] | 29 | |
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| 30 | if ( self == NULL ) |
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| 31 | return -1; |
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| 32 | |
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| 33 | memset(self, 0, sizeof(struct roardsp_amp)); |
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| 34 | |
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| 35 | filter->inst = (void*) self; |
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| 36 | |
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[1141] | 37 | roardsp_filter_reset(filter, ROARDSP_RESET_FULL); |
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[882] | 38 | |
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| 39 | return 0; |
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| 40 | } |
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| 41 | |
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| 42 | int roardsp_amp_uninit(struct roardsp_filter * filter) { |
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| 43 | |
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[3001] | 44 | roar_mm_free(filter->inst); |
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[882] | 45 | return 0; |
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| 46 | } |
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| 47 | |
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| 48 | int roardsp_amp_calc8 (struct roardsp_filter * filter, void * data, size_t samples) { |
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| 49 | struct roardsp_amp * self = (struct roardsp_amp *) filter->inst; |
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| 50 | int8_t * samp = (int8_t *) data; |
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| 51 | register int_least32_t s; |
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| 52 | size_t i; |
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| 53 | |
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| 54 | for (i = 0; i < samples; i++) { |
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| 55 | s = samp[i]; |
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| 56 | s *= self->mul; |
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| 57 | s /= self->div; |
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| 58 | samp[i] = s; |
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| 59 | }; |
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| 60 | |
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| 61 | return 0; |
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| 62 | } |
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| 63 | |
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| 64 | int roardsp_amp_calc16 (struct roardsp_filter * filter, void * data, size_t samples) { |
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| 65 | struct roardsp_amp * self = (struct roardsp_amp *) filter->inst; |
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| 66 | int16_t * samp = (int16_t *) data; |
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| 67 | register int_least32_t s; |
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| 68 | size_t i; |
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| 69 | |
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| 70 | for (i = 0; i < samples; i++) { |
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| 71 | s = samp[i]; |
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| 72 | s *= self->mul; |
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| 73 | s /= self->div; |
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| 74 | // ROAR_DBG("roardsp_amp_calc16(*): samp[i=%u] = %i, s=%i, self->mul=%i, self->div=%i", i, samp[i], s, self->mul, self->div); |
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| 75 | samp[i] = s; |
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| 76 | }; |
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| 77 | |
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| 78 | return 0; |
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| 79 | } |
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| 80 | |
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| 81 | int roardsp_amp_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
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| 82 | struct roardsp_amp * self = (struct roardsp_amp *) filter->inst; |
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| 83 | int32_t old; |
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| 84 | |
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| 85 | if ( cmd == ROARDSP_FCTL_MUL ) { |
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| 86 | old = self->div; |
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| 87 | self->mul = *(int32_t*)data; |
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| 88 | *(int32_t*)data = old; |
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| 89 | } else if ( cmd == ROARDSP_FCTL_DIV ) { |
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| 90 | old = self->div; |
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| 91 | self->div = *(int32_t*)data; |
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| 92 | *(int32_t*)data = old; |
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| 93 | } else { |
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| 94 | return -1; |
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| 95 | } |
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| 96 | |
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| 97 | |
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| 98 | return 0; |
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| 99 | } |
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| 100 | |
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[1141] | 101 | int roardsp_amp_reset (struct roardsp_filter * filter, int what) { |
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| 102 | struct roardsp_amp * self; |
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| 103 | |
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| 104 | if ( filter == NULL ) |
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| 105 | return -1; |
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| 106 | |
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| 107 | if ( filter->inst == NULL ) |
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| 108 | return -1; |
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| 109 | |
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| 110 | self = filter->inst; |
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| 111 | |
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| 112 | switch (what) { |
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| 113 | case ROARDSP_RESET_NONE: |
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| 114 | case ROARDSP_RESET_STATE: |
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| 115 | return 0; |
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| 116 | break; |
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| 117 | case ROARDSP_RESET_FULL: |
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| 118 | self->mul = 1; |
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| 119 | self->div = 1; |
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| 120 | return 0; |
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| 121 | break; |
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| 122 | default: |
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| 123 | return -1; |
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| 124 | } |
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| 125 | |
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| 126 | return -1; |
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| 127 | } |
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| 128 | |
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[882] | 129 | //ll |
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