1 /*
2     SDL - Simple DirectMedia Layer
3     Copyright (C) 1997-2012 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 */
58