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