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annotate src/xs_filter.c @ 660:b0743dc9165d

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Change tabs to 4 spaces, everywhere.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 02 Apr 2008 22:10:05 +0300
parents e5b302358312
children
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1 /*
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2 XMMS-SID - SIDPlay input plugin for X MultiMedia System (XMMS)
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3
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4 Audio rate-conversion filter
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5
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6 Programmed and designed by Matti 'ccr' Hamalainen <ccr@tnsp.org>
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d2e6682d3ef8 Copyright year update
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7 (C) Copyright 1999-2007 Tecnic Software productions (TNSP)
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8
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9 This program is free software; you can redistribute it and/or modify
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10 it under the terms of the GNU General Public License as published by
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11 the Free Software Foundation; either version 2 of the License, or
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12 (at your option) any later version.
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13
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14 This program 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 along
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20 with this program; if not, write to the Free Software Foundation, Inc.,
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21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 */
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23 #include "xs_filter.h"
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24
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25 /* Let's do some preprocessor magic :) */
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26 #define XS_FVAR(T, P, K) g ## K ## int ## P *sp_ ## T ## P , *dp_ ## T ## P
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27
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28 #define XS_FILTER1(T, P, K, Q) \
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29 dataSize /= sizeof(g ## K ## int ## P); \
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30 sp_ ## T ## P = (g ## K ## int ## P *) srcBuf; \
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31 dp_ ## T ## P = (g ## K ## int ## P *) destBuf; \
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32 while (dataSize-- > 0) { \
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33 for (tmp = 0, i = 0; i < oversampleFactor; i++) \
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34 tmp += (gint32) ((gint ## P) (*(sp_ ## T ## P ++) Q)); \
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35 xs_filter_mbn = (tmp + xs_filter_mbn) / (oversampleFactor + 1); \
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36 *(dp_ ## T ## P ++) = ((g ## K ## int ## P) xs_filter_mbn) Q ; \
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37 }
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38
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39
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40 static gint32 xs_filter_mbn = 0;
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41
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42
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43 gint xs_filter_rateconv(void *destBuf, void *srcBuf, const AFormat audioFormat,
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44 const gint oversampleFactor, const gint bufSize)
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45 {
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46 static gint32 tmp;
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47 XS_FVAR(s, 8,);
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48 XS_FVAR(u, 8, u);
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49 XS_FVAR(s, 16,);
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50 XS_FVAR(u, 16, u);
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51 gint i;
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52 gint dataSize = bufSize;
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53
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54 if (dataSize <= 0)
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55 return dataSize;
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57 switch (audioFormat) {
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58 case FMT_U8:
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59 XS_FILTER1(u, 8, u, ^0x80)
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60 break;
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61
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62 case FMT_S8:
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63 XS_FILTER1(s, 8,,)
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64 break;
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66
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67 case FMT_U16_BE:
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68 case FMT_U16_LE:
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69 case FMT_U16_NE:
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70 XS_FILTER1(u, 16, u, ^0x8000)
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71 break;
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73 case FMT_S16_BE:
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74 case FMT_S16_LE:
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75 case FMT_S16_NE:
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76 XS_FILTER1(s, 16,,)
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77 break;
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78
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79 default:
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80 return -1;
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81 }
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83 return 0;
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84 }