1 | //filter_dcblock.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2013 |
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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, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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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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29 | struct roardsp_dcblock * inst = roar_mm_malloc(sizeof(struct roardsp_dcblock)); |
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30 | // roardsp_downmix_ctl(filter, ROARDSP_FCTL_MODE, &mode); |
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31 | |
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32 | (void)stream, (void)id; |
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33 | |
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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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54 | roar_mm_free(filter->inst); |
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55 | |
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56 | return 0; |
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57 | } |
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58 | |
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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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66 | ROAR_DBG("roardsp_dcblock_reset(filter=%p, what=%i) = ?", filter, what); |
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67 | |
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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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78 | ((struct roardsp_dcblock*)filter->inst)->cur = 0; |
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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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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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99 | ROAR_DBG("roardsp_dcblock_calc16(*): s=%li (current block of %lu samples)", (long int)s, (unsigned long int)samples); |
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100 | |
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101 | s = (float)(s / samples); |
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102 | |
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103 | ROAR_DBG("roardsp_dcblock_calc16(*): inst=%p, inst->cur=%i", inst, inst->cur); |
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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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118 | ROAR_DBG("roardsp_dcblock_calc16(*): new DC value: %li", (long int)s); |
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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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