Mercurial > SDL_sound_CoreAudio

annotate alt_audio_convert.h @ 372:ee0678efd4a3

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Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 25 Jun 2002 17:15:29 +0000
parents 1b463ef9bcc2
children 24a610dfbbfd
rev   line source
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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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28 #ifndef _INCLUDE_AUDIO_CONVERT_H_
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29 #define _INCLUDE_AUDIO_CONVERT_H_
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30
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31 #include "SDL_audio.h"
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32 #define Sound_AI_Loop 0x2
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33 #define _fsize 32
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35
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36 typedef struct{
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37 Sint16 c[16][4*_fsize];
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38 Uint8 incr[16];
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39 int denominator;
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40 int numerator;
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41 } VarFilter;
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42
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43 typedef struct{
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44 Uint8* 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 /*
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50 typedef struct{
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51 VarFilter filter;
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52 double mult; // buffer must be len*buf_mult big
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53 int add;
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54 int (*adapter[32]) ( AdapterC Data, int length );
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55 } SDL_AudioC;
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56
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57 */
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58
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59 /* the len_* variables and the needed variable are not used internally,
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60 they are provided for compatibility */
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62 typedef struct{
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63 int needed;
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64 VarFilter filter;
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65 Uint8* buf;
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66 int len; /* Length of original audio buffer */
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67 int len_cvt; /* Length of converted audio buffer */
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68 int len_mult; /* buffer must be len*len_mult big */
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69 double len_ratio; /* Given len, final size is len*len_ratio */
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70
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71 double add;
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72 double mult;
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73 int (*adapter[32]) ( AdapterC Data, int length );
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74 } Sound_AudioCVT;
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75
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76 #define SDL_AI_Loop 0x01
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78 extern DECLSPEC int Sound_ConvertAudio( Sound_AudioCVT *Data );
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80 extern DECLSPEC int Sound_BuildAudioCVT( Sound_AudioCVT *Data,
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81 Uint16 src_format, Uint8 src_channels, int src_rate,
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82 Uint16 dst_format, Uint8 dst_channels, int dst_rate );
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84 #endif /* _INCLUDE_AUDIO_CONVERT_H_ */
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85