Mercurial > SDL_sound_CoreAudio

annotate alt_audio_convert.h @ 394:b495d05a88b3

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Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 11 Jul 2002 04:33:17 +0000
parents fb519e6028e3
children 5b8a07b5162e
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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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 #include "SDL_sound.h"
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37 typedef struct{
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38 Sint16 numerator;
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39 Sint16 denominator;
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40 } Fraction;
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41
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42 typedef struct{
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43 Sint16 c[16][4*_fsize];
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44 Uint8 incr[16];
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45 Fraction ratio;
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46 Uint32 zero;
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47 int mask;
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48 } VarFilter;
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49
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50 typedef struct{
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51 Uint8* buffer;
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52 int mode;
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53 VarFilter *filter;
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54 } AdapterC;
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55
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56 typedef int (*Adapter) ( AdapterC Data, int length );
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58 typedef struct{
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59 VarFilter filter;
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60 Adapter adapter[32];
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61 /* buffer must be len*len_mult(+len_add) big */
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62 int len_mult;
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63 int len_add;
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64 double add;
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66 /* the following elements are provided for compatibility: */
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67 /* the size of the output is approx len*len_ratio */
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68 double len_ratio;
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69 Uint8* buf; /* input/output buffer */
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70 int needed; /* 0 if nothing to be done, 1 otherwise */
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71 int len; /* Length of the input */
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72 int len_cvt; /* Length of converted audio buffer */
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73 } Sound_AudioCVT;
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74
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75 #define SDL_SOUND_Loop 0x10
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77 extern SNDDECLSPEC int Sound_ConvertAudio( Sound_AudioCVT *Data );
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79 extern SNDDECLSPEC int Sound_BuildAudioCVT( Sound_AudioCVT *Data,
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80 Uint16 src_format, Uint8 src_channels, int src_rate,
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81 Uint16 dst_format, Uint8 dst_channels, int dst_rate, Uint32 dst_size );
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83 #endif /* _INCLUDE_AUDIO_CONVERT_H_ */
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84