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view src/audio/nto/SDL_nto_audio.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"

#ifndef __SDL_NTO_AUDIO_H__
#define __SDL_NTO_AUDIO_H__

#include <sys/asoundlib.h>

#include "../SDL_sysaudio.h"

/* Hidden "this" pointer for the audio functions */
#define _THIS	SDL_AudioDevice *this

struct SDL_PrivateAudioData
{
    /* The audio device handle */
    int cardno;
    int deviceno;
    snd_pcm_t* audio_handle;

    /* The audio file descriptor */
    int audio_fd;

    /* The parent process id, to detect when application quits */
    pid_t parent;

    /* Raw mixing buffer */
    Uint8* pcm_buf;
    Uint32 pcm_len;

    /* QSA parameters */
    snd_pcm_channel_status_t cstatus;
    snd_pcm_channel_params_t cparams;
    snd_pcm_channel_setup_t  csetup;
};

#define cardno          (this->hidden->cardno)
#define deviceno        (this->hidden->deviceno)
#define audio_handle    (this->hidden->audio_handle)
#define audio_fd        (this->hidden->audio_fd)
#define parent          (this->hidden->parent)
#define pcm_buf         (this->hidden->pcm_buf)
#define pcm_len         (this->hidden->pcm_len)
#define cstatus         (this->hidden->cstatus)
#define cparams         (this->hidden->cparams)
#define csetup          (this->hidden->csetup)

#endif /* __SDL_NTO_AUDIO_H__ */