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278
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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 Written by Matti "ccr" Hamalainen <ccr@tnsp.org>
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7
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8 This program is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 2 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program; if not, write to the Free Software
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20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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21 */
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22 #include "xmms-sid.h"
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23
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24 /* Let's do some preprocessor magic :) */
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25 #define XS_FVAR(T, P, K) g ## K ## int ## P *sp_ ## T ## P , *dp_ ## T ## P
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26
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27 #define XS_FILTER1(T, P, K) \
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28 dataSize /= sizeof(g ## K ## int ## P); tmpo_ ## T = 0; \
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29 sp_ ## T ## P = (g ## K ## int ## P *) srcBuf; \
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30 dp_ ## T ## P = (g ## K ## int ## P *) destBuf; \
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280
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31 while (dataSize-- > 0) { \
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278
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32 for (tmp_ ## T = 0, i = 0; i < oversampleFactor; i++) \
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280
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33 tmp_ ## T += *(sp_ ## T ## P ++); \
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34 tmpo_ ## T = (tmp_ ## T + tmpo_ ## T ) / (oversampleFactor * 2); \
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35 *(dp_ ## T ## P ++) = tmpo_ ## T; \
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278
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36 }
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37
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38 gint xs_rateconv_filter(void *destBuf, void *srcBuf, gint audioFormat, gint oversampleFactor, gint dataSize)
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39 {
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40 guint32 tmp_u, tmpo_u;
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41 gint32 tmp_s, tmpo_s;
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42 XS_FVAR(u, 8, u);
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43 XS_FVAR(s, 8,);
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44 XS_FVAR(u, 16, u);
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45 XS_FVAR(s, 16,);
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46 gint i;
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47
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48 if (dataSize <= 0)
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49 return dataSize;
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50
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51 switch (audioFormat) {
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52 case FMT_U8:
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53 case FMT_S8:
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54 XS_FILTER1(s, 8,);
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55 break;
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56
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57
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58 case FMT_U16_BE:
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59 case FMT_U16_LE:
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60 case FMT_U16_NE:
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61
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62 case FMT_S16_BE:
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63 case FMT_S16_LE:
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64 case FMT_S16_NE:
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65 XS_FILTER1(s, 16,);
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66 break;
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67
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68 default:
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69 return -1;
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70 }
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71
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72 return 0;
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73 }
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74
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