Mercurial > sdl-ios-xcode

annotate src/audio/mme/SDL_mmeaudio.h @ 2866:e532417a6977

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Fixed SDL 1.2 compatibility problem. The API specifies that SDL_OpenAudio() will fill out the 'desired' audio spec with the correct samples and size set by the driver. This value is important since it may be used by applications that size audio buffers, etc. However, we want to allow advanced applications to call SDL_OpenAudioDevice() which gets passed a const 'desired' parameter, and have the correct data filled into the 'obtained' parameter, possibly allowing or not allowing format changes. So... 'obtained' becomes the audio format the user callback is expected to use, and we add flags to allow the application to specify which format changes are allowed. Note: We really need to add a way to query the 'obtained' audio spec.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 13 Dec 2008 06:36:47 +0000
parents 99210400e8b9
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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26 #ifndef _SDL_mmeaudio_h
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27 #define _SDL_mmeaudio_h
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28
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29 #include "../SDL_sysaudio.h"
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31 /* Hidden "this" pointer for the audio functions */
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32 #define _THIS SDL_AudioDevice *this
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33 #define NUM_BUFFERS 2
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34
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35 struct SharedMem
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36 {
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37 HWAVEOUT sound;
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38 WAVEHDR wHdr[NUM_BUFFERS];
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39 PCMWAVEFORMAT wFmt;
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40 };
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41
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42 struct SDL_PrivateAudioData
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43 {
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44 Uint8 *mixbuf; /* The raw allocated mixing buffer */
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45 struct SharedMem *shm;
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46 int next_buffer;
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47 };
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48
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49 #endif /* _SDL_mmeaudio_h */
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50
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51 /* vi: set ts=4 sw=4 expandtab: */