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annotate src/audio/mme/SDL_mmeaudio.h @ 939:c7c04f811994

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Date: Tue, 01 Jun 2004 15:27:44 +0300 From: Martin_Storsj Subject: Update for dynamic loading of ALSA I sent you a patch a few months ago which enables SDL to load ALSA dynamically. Now I've finally got time to tweak this yet some more. I've added code from alsa.m4 (from alsa's dev package) to acinclude.m4, and made the detection of the alsa library name a bit better. I've also fixed up the loading versioned symbols with dlvsym, so that it falls back to dlsym. I wouldn't say the configure script is complete yet, but this is how far I've come this time, and I'm no expert at those things.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Aug 2004 04:20:00 +0000
parents b8d311d90021
children 604d73db6802
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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
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23 /* Allow access to a raw mixing buffer */
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24
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28 #include <mme_api.h>
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29
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30 #include "SDL_audio.h"
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31 #include "SDL_mutex.h"
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32 #include "SDL_timer.h"
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33 #include "SDL_audio_c.h"
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34
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35 #ifndef _SDL_lowaudio_h
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36 #define _SDL_lowaudio_h
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37 #include "SDL_sysaudio.h"
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38
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39 /* Hidden "this" pointer for the video functions */
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40 #define _THIS SDL_AudioDevice *this
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41 #define NUM_BUFFERS 2
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42
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43 struct SharedMem {
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44 HWAVEOUT sound;
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45 WAVEHDR wHdr[NUM_BUFFERS];
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46 PCMWAVEFORMAT wFmt;
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47 };
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48
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49 struct SDL_PrivateAudioData {
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50 Uint8 *mixbuf; /* The raw allocated mixing buffer */
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51 struct SharedMem *shm;
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52 int next_buffer;
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53 };
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54
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55 #define shm (this->hidden->shm)
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56 #define mixbuf (this->hidden->mixbuf)
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57 #define next_buffer (this->hidden->next_buffer)
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58 /* Old variable names */
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59 #endif /* _SDL_lowaudio_h */