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comparison alt_audio_convert.h @ 338:7b9a0f3f030e

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Initial add.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 20 May 2002 16:18:09 +0000
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children c984aa6990f7
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337:83233d8a5929 338:7b9a0f3f030e
1 /*
2 Extended Audio Converter for SDL (Simple DirectMedia Layer)
3 Copyright (C) 2002 Frank Ranostaj
4 Institute of Applied Physik
5 Johann Wolfgang Goethe-Universität
6 Frankfurt am Main, Germany
7
8 This library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Library General Public
10 License as published by the Free Software Foundation; either
11 version 2 of the License, or (at your option) any later version.
12
13 This library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Library General Public License for more details.
17
18 You should have received a copy of the GNU Library General Public
19 License along with this library; if not, write to the Free
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
22 Frank Ranostaj
23 ranostaj@stud.uni-frankfurt.de
24
25 (This code blatantly abducted for SDL_sound. Thanks, Frank! --ryan.)
26
27 */
28
29 #ifndef _INCLUDE_AUDIO_CONVERT_H_
30 #define _INCLUDE_AUDIO_CONVERT_H_
31
32 #include "SDL_audio.h"
33 #define Sound_AI_Loop 0x2
34 #define _fsize 64
35
36
37 typedef struct{
38 short c[16][2*_fsize];
39 char incr[16];
40 int pos_mod;
41 } VarFilter;
42
43 typedef struct{
44 short* buffer;
45 int mode;
46 VarFilter *filter;
47 } AdapterC;
48
49 typedef struct{
50 int needed;
51 VarFilter filter;
52 double len_mult; /* buffer must be len*len_mult big*/
53 Uint8* buf;
54 int len;
55 int len_cvt; /* Length of converted audio buffer */
56 int add;
57 int (*adapter[32]) ( AdapterC Data, int length );
58 } Sound_AudioCVT;
59
60 extern DECLSPEC int Sound_ConvertAudio( Sound_AudioCVT *Data );
61
62 extern DECLSPEC int Sound_BuildAudioConverter( Sound_AudioCVT *Data,
63 Uint16 src_format, Uint8 src_channels, int src_rate,
64 Uint16 dst_format, Uint8 dst_channels, int dst_rate );
65
66 #endif /* _INCLUDE_AUDIO_CONVERT_H_ */
67