Mercurial > SDL_sound_CoreAudio

annotate alt_audio_convert.h @ 423:c1db690b79ed

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Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 30 Sep 2002 08:03:10 +0000
parents a65440b3a057
children 5b00e43ec23c
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 typedef struct{
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36 Sint16 numerator;
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37 Sint16 denominator;
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38 } Fraction;
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39
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40 typedef struct{
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41 Sint16 c[16][4*_fsize];
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42 Uint8 incr[16];
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43 Fraction ratio;
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44 int mask;
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45 } VarFilter;
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46
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47 typedef struct{
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48 Uint8* buffer;
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49 int mode;
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50 VarFilter *filter;
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51 } AdapterC;
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52
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53 typedef int (*Adapter) ( AdapterC Data, int length );
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54
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55 typedef struct{
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56 VarFilter filter;
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57 int filter_index;
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58 Adapter adapter[32];
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59 /* buffer must be len*len_mult(+len_add) big */
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60 int len_mult;
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61 int len_add;
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62 double add;
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64 /* the following elements are provided for compatibility: */
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65 /* the size of the output is approx len*len_ratio */
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66 double len_ratio;
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67 Uint8* buf; /* input/output buffer */
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68 int needed; /* 0 if nothing to be done, 1 otherwise */
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69 int len; /* Length of the input */
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70 int len_cvt; /* Length of converted audio buffer */
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71 } Sound_AudioCVT;
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72
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73 #define SDL_SOUND_Loop 0x10
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74
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75 #ifndef SNDDECLSPEC
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76 #define SNDDECLSPEC DECLSPEC
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77 #endif
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78
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79 extern SNDDECLSPEC int Sound_ConvertAudio( Sound_AudioCVT *Data );
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81 extern SNDDECLSPEC int Sound_AltConvertAudio( Sound_AudioCVT *Data,
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82 Uint8* buffer, int length, int mode );
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83
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84 extern SNDDECLSPEC int Sound_BuildAudioCVT( Sound_AudioCVT *Data,
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85 Uint16 src_format, Uint8 src_channels, int src_rate,
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86 Uint16 dst_format, Uint8 dst_channels, int dst_rate, Uint32 bufsize );
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88 extern SNDDECLSPEC int Sound_AltBuildAudioCVT( Sound_AudioCVT *Data,
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89 SDL_AudioSpec src, SDL_AudioSpec dst );
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91 extern SNDDECLSPEC int Sound_estimateBufferSize( Sound_AudioCVT *Data,
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92 int length );
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94 #endif /* _INCLUDE_AUDIO_CONVERT_H_ */
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95