Mercurial > SDL_sound_CoreAudio
annotate alt_audio_convert.h @ 418:e6fa92dc21eb
Updated.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Thu, 26 Sep 2002 04:27:21 +0000 |
parents | fb519e6028e3 |
children | 5b8a07b5162e |
rev | line source |
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338 | 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 */ |
338 | 27 |
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28 #ifndef _INCLUDE_AUDIO_CONVERT_H_ |
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29 #define _INCLUDE_AUDIO_CONVERT_H_ |
338 | 30 |
31 #include "SDL_audio.h" | |
32 #define Sound_AI_Loop 0x2 | |
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33 #define _fsize 32 |
338 | 34 |
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35 #include "SDL_sound.h" |
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36 |
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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; |
338 | 41 |
42 typedef struct{ | |
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43 Sint16 c[16][4*_fsize]; |
371 | 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; |
338 | 48 } VarFilter; |
49 | |
50 typedef struct{ | |
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51 Uint8* buffer; |
338 | 52 int mode; |
53 VarFilter *filter; | |
54 } AdapterC; | |
55 | |
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56 typedef int (*Adapter) ( AdapterC Data, int length ); |
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57 |
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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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65 |
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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 */ |
371 | 72 int len_cvt; /* Length of converted audio buffer */ |
338 | 73 } Sound_AudioCVT; |
74 | |
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75 #define SDL_SOUND_Loop 0x10 |
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76 |
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77 extern SNDDECLSPEC int Sound_ConvertAudio( Sound_AudioCVT *Data ); |
338 | 78 |
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79 extern SNDDECLSPEC int Sound_BuildAudioCVT( Sound_AudioCVT *Data, |
338 | 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 ); |
338 | 82 |
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83 #endif /* _INCLUDE_AUDIO_CONVERT_H_ */ |
338 | 84 |