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view src/audio/mme/SDL_mmeaudio.h @ 4001:6831b8723a85 SDL-1.2

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Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:24:36 +0000
parents d910939febfa
children 782fd950bd46 a1b03ba2fcd0
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* Allow access to a raw mixing buffer */

#ifndef _SDL_lowaudio_h
#define _SDL_lowaudio_h

#include "../SDL_sysaudio.h"

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_AudioDevice *this
#define NUM_BUFFERS 2

struct SharedMem {
    HWAVEOUT sound;
    WAVEHDR wHdr[NUM_BUFFERS];
    PCMWAVEFORMAT wFmt;
};

struct SDL_PrivateAudioData {
    Uint8 *mixbuf;          /* The raw allocated mixing buffer */
    struct SharedMem *shm;
    int next_buffer;
};

#define shm			(this->hidden->shm)
#define mixbuf			(this->hidden->mixbuf)
#define next_buffer		(this->hidden->next_buffer)
/* Old variable names */
#endif /* _SDL_lowaudio_h */