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338
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1 /*
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2 Extended Audio Converter for SDL (Simple DirectMedia Layer)
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3 Copyright (C) 2002 Frank Ranostaj
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4 Institute of Applied Physik
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5 Johann Wolfgang Goethe-Universität
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6 Frankfurt am Main, Germany
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7
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8 This library is free software; you can redistribute it and/or
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9 modify it under the terms of the GNU Library General Public
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10 License as published by the Free Software Foundation; either
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11 version 2 of the License, or (at your option) any later version.
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12
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13 This library 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 GNU
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16 Library 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 Library General Public
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19 License along with this library; if not, write to the Free
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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 Frank Ranostaj
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23 ranostaj@stud.uni-frankfurt.de
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24
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25 (This code blatantly abducted for SDL_sound. Thanks, Frank! --ryan.)
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26
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27 */
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28
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29 #ifndef _INCLUDE_AUDIO_CONVERT_H_
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30 #define _INCLUDE_AUDIO_CONVERT_H_
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31
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32 #include "SDL_audio.h"
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33 #define Sound_AI_Loop 0x2
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34 #define _fsize 64
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35
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36
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37 typedef struct{
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38 short c[16][2*_fsize];
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39 char incr[16];
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40 int pos_mod;
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41 } VarFilter;
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42
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43 typedef struct{
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44 short* buffer;
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45 int mode;
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46 VarFilter *filter;
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47 } AdapterC;
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48
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49 typedef struct{
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50 int needed;
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51 VarFilter filter;
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52 double len_mult; /* buffer must be len*len_mult big*/
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53 Uint8* buf;
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54 int len;
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55 int len_cvt; /* Length of converted audio buffer */
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56 int add;
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57 int (*adapter[32]) ( AdapterC Data, int length );
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58 } Sound_AudioCVT;
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59
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60 extern DECLSPEC int Sound_ConvertAudio( Sound_AudioCVT *Data );
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61
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62 extern DECLSPEC int Sound_BuildAudioConverter( Sound_AudioCVT *Data,
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63 Uint16 src_format, Uint8 src_channels, int src_rate,
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64 Uint16 dst_format, Uint8 dst_channels, int dst_rate );
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65
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66 #endif /* _INCLUDE_AUDIO_CONVERT_H_ */
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67
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