[4668] | 1 | //filter_dcblock.c: |
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[1100] | 2 | |
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| 3 | /* |
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[5381] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2012 |
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[1100] | 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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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[1100] | 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include "libroardsp.h" |
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| 27 | |
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| 28 | int roardsp_dcblock_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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[3001] | 29 | struct roardsp_dcblock * inst = roar_mm_malloc(sizeof(struct roardsp_dcblock)); |
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[1100] | 30 | // roardsp_downmix_ctl(filter, ROARDSP_FCTL_MODE, &mode); |
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| 31 | |
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[5270] | 32 | (void)stream, (void)id; |
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| 33 | |
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[1100] | 34 | if ( inst == NULL ) { |
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| 35 | ROAR_ERR("roardsp_dcblock_init(*): Can not alloc memory for filter dcblock: %s", strerror(errno)); |
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| 36 | filter->inst = NULL; |
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| 37 | return -1; |
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| 38 | } |
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| 39 | |
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| 40 | memset(inst, 0, sizeof(struct roardsp_dcblock)); |
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| 41 | |
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| 42 | filter->inst = inst; |
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| 43 | |
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| 44 | return 0; |
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| 45 | } |
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| 46 | |
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| 47 | int roardsp_dcblock_uninit (struct roardsp_filter * filter) { |
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| 48 | if ( filter == NULL ) |
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| 49 | return -1; |
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| 50 | |
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| 51 | if ( filter->inst == NULL ) |
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| 52 | return -1; |
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| 53 | |
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[3001] | 54 | roar_mm_free(filter->inst); |
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[1100] | 55 | |
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| 56 | return 0; |
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| 57 | } |
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| 58 | |
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[1131] | 59 | int roardsp_dcblock_reset (struct roardsp_filter * filter, int what) { |
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| 60 | if ( filter == NULL ) |
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| 61 | return -1; |
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| 62 | |
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| 63 | if ( filter->inst == NULL ) |
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| 64 | return -1; |
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| 65 | |
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[1135] | 66 | ROAR_DBG("roardsp_dcblock_reset(filter=%p, what=%i) = ?", filter, what); |
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| 67 | |
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[1131] | 68 | switch (what) { |
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| 69 | case ROARDSP_RESET_NONE: |
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| 70 | return 0; |
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| 71 | break; |
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| 72 | case ROARDSP_RESET_FULL: |
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| 73 | memset(filter->inst, 0, sizeof(struct roardsp_dcblock)); |
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| 74 | return 0; |
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| 75 | break; |
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| 76 | case ROARDSP_RESET_STATE: |
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| 77 | memset(((struct roardsp_dcblock*)filter->inst)->dc, 0, sizeof(int32_t)*ROARDSP_DCBLOCK_NUMBLOCKS); |
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[1135] | 78 | ((struct roardsp_dcblock*)filter->inst)->cur = 0; |
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[1131] | 79 | return 0; |
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| 80 | break; |
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| 81 | default: |
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| 82 | return -1; |
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| 83 | } |
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| 84 | |
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| 85 | return -1; |
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| 86 | } |
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| 87 | |
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[1100] | 88 | int roardsp_dcblock_calc16 (struct roardsp_filter * filter, void * data, size_t samples) { |
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| 89 | struct roardsp_dcblock * inst = filter->inst; |
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| 90 | int16_t * samp = (int16_t *) data; |
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| 91 | register int64_t s = 0; |
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| 92 | size_t i; |
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| 93 | |
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| 94 | for (i = 0; i < samples; i++) { |
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| 95 | // ROAR_WARN("roardsp_dcblock_calc16(*): s=%i, samp[i=%i]=%i", s, i, samp[i]); |
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| 96 | s += samp[i]; |
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| 97 | } |
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| 98 | |
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[1135] | 99 | ROAR_DBG("roardsp_dcblock_calc16(*): s=%i (current block of %i samples)", s, samples); |
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[1100] | 100 | |
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| 101 | s = (float)(s / samples); |
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| 102 | |
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[1135] | 103 | ROAR_DBG("roardsp_dcblock_calc16(*): inst=%p, inst->cur=%i", inst, inst->cur); |
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[1100] | 104 | inst->dc[(inst->cur)++] = s; |
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| 105 | |
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| 106 | if ( inst->cur == ROARDSP_DCBLOCK_NUMBLOCKS ) |
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| 107 | inst->cur = 0; |
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| 108 | |
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| 109 | s = 0; |
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| 110 | |
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| 111 | for (i = 0; i < ROARDSP_DCBLOCK_NUMBLOCKS; i++) |
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| 112 | s += inst->dc[i]; |
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| 113 | |
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| 114 | s /= ROARDSP_DCBLOCK_NUMBLOCKS; |
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| 115 | |
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| 116 | // s += (ROAR_INSTINT)filter->inst; |
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| 117 | |
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[1135] | 118 | ROAR_DBG("roardsp_dcblock_calc16(*): new DC value: %i", s); |
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[1100] | 119 | |
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| 120 | for (i = 0; i < samples; i++) |
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| 121 | samp[i] -= s; |
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| 122 | |
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| 123 | ROAR_DBG("roardsp_downmix_calc16(*) = 0"); |
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| 124 | return 0; |
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| 125 | } |
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| 126 | |
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| 127 | |
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| 128 | |
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| 129 | //ll |
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