1 /*

     2     SDL - Simple DirectMedia Layer

     3     Copyright (C) 1997-2006 Sam Lantinga

     4 

     5     This library is free software; you can redistribute it and/or

     6     modify it under the terms of the GNU Lesser General Public

     7     License as published by the Free Software Foundation; either

     8     version 2.1 of the License, or (at your option) any later version.

     9 

    10     This library is distributed in the hope that it will be useful,

    11     but WITHOUT ANY WARRANTY; without even the implied warranty of

    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13     Lesser General Public License for more details.

    14 

    15     You should have received a copy of the GNU Lesser General Public

    16     License along with this library; if not, write to the Free Software

    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    18 

    19     Sam Lantinga

    20     slouken@libsdl.org

    21 */

    22 #include "SDL_config.h"

    23 

    24 #ifndef _SDL_esdaudio_h

    25 #define _SDL_esdaudio_h

    26 

    27 #include "../SDL_sysaudio.h"

    28 

    29 /* Hidden "this" pointer for the video functions */

    30 #define _THIS	SDL_AudioDevice *this

    31 

    32 struct SDL_PrivateAudioData {

    33 	/* The file descriptor for the audio device */

    34 	int audio_fd;

    35 

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

    37 	pid_t parent;

    38 

    39 	/* Raw mixing buffer */

    40 	Uint8 *mixbuf;

    41 	int    mixlen;

    42 

    43 	/* Support for audio timing using a timer */

    44 	float frame_ticks;

    45 	float next_frame;

    46 };

    47 #define FUDGE_TICKS	10	/* The scheduler overhead ticks per frame */

    48 

    49 /* Old variable names */

    50 #define audio_fd		(this->hidden->audio_fd)

    51 #define parent			(this->hidden->parent)

    52 #define mixbuf			(this->hidden->mixbuf)

    53 #define mixlen			(this->hidden->mixlen)

    54 #define frame_ticks		(this->hidden->frame_ticks)

    55 #define next_frame		(this->hidden->next_frame)

    56 

    57 #endif /* _SDL_esdaudio_h */