| 1 | //filter_quantify.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
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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_quantify_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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| 29 | |
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| 30 | roardsp_filter_reset(filter, ROARDSP_RESET_FULL); |
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| 31 | |
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| 32 | return 0; |
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| 33 | } |
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| 34 | |
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| 35 | static inline int16_t _calc(int16_t val, void * inst) { |
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| 36 | register float s = val; |
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| 37 | s /= 32768; |
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| 38 | s *= (ROAR_INSTINT)inst; |
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| 39 | s = (int16_t)s; |
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| 40 | s /= (ROAR_INSTINT)inst; |
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| 41 | s *= 32768; |
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| 42 | return s; |
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| 43 | } |
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| 44 | |
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| 45 | #define _calcX(bits,rshift,lshift) \ |
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| 46 | /* this code is buggy for 8 bit filters */ \ |
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| 47 | int roardsp_quantify_calc##bits (struct roardsp_filter * filter, void * data, size_t samples) { \ |
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| 48 | int##bits##_t * samp = (int##bits##_t *) data; \ |
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| 49 | size_t i; \ |
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| 50 | \ |
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| 51 | for (i = 0; i < samples; i++) { \ |
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| 52 | samp[i] = _calc(samp[i] rshift, filter->inst) lshift; \ |
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| 53 | } \ |
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| 54 | \ |
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| 55 | ROAR_DBG("roardsp_quantify_calc%i(*) = 0", bits); \ |
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| 56 | return 0; \ |
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| 57 | } |
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| 58 | |
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| 59 | /* look at our nice parameters ;) */ |
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| 60 | _calcX(8,<< 8,>> 8) |
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| 61 | _calcX(16,,) |
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| 62 | _calcX(32,>> 16,<< 16) |
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| 63 | |
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| 64 | int roardsp_quantify_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
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| 65 | int32_t old; |
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| 66 | |
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| 67 | if ( cmd == ROARDSP_FCTL_N ) { |
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| 68 | old = (ROAR_INSTINT)filter->inst; |
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| 69 | filter->inst = (void*)(ROAR_INSTINT)*(int32_t*)data; |
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| 70 | *(int32_t*)data = old; |
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| 71 | } else { |
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| 72 | ROAR_DBG("roardsp_quantify_ctl(*) = -1"); |
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| 73 | return -1; |
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| 74 | } |
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| 75 | |
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| 76 | |
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| 77 | ROAR_DBG("roardsp_quantify_ctl(*) = 0"); |
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| 78 | return 0; |
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| 79 | } |
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| 80 | |
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| 81 | int roardsp_quantify_reset (struct roardsp_filter * filter, int what) { |
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| 82 | int n = 64; |
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| 83 | |
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| 84 | if ( filter == NULL ) |
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| 85 | return -1; |
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| 86 | |
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| 87 | switch (what) { |
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| 88 | case ROARDSP_RESET_NONE: |
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| 89 | case ROARDSP_RESET_STATE: |
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| 90 | return 0; |
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| 91 | break; |
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| 92 | case ROARDSP_RESET_FULL: |
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| 93 | roardsp_quantify_ctl(filter, ROARDSP_FCTL_N, &n); |
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| 94 | return 0; |
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| 95 | break; |
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| 96 | default: |
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| 97 | return -1; |
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| 98 | } |
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| 99 | |
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| 100 | return -1; |
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| 101 | } |
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| 102 | |
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| 103 | //ll |
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