src/audio/dma/SDL_dmaaudio.h
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FUNCTIONS
This source file includes following functions.
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 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 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_dmaaudio.h,v 1.1.2.2 2001/02/10 07:20:03 hercules Exp $";
26 #endif
27
28 #ifndef _SDL_dspaudio_h
29 #define _SDL_dspaudio_h
30
31 #include "SDL_sysaudio.h"
32
33 /* Hidden "this" pointer for the video functions */
34 #define _THIS SDL_AudioDevice *this
35
36 struct SDL_PrivateAudioData {
37 /* The file descriptor for the audio device */
38 int audio_fd;
39
40 /* The parent process id, to detect when application quits */
41 pid_t parent;
42
43 /* Raw mixing buffer */
44 Uint8 *dma_buf;
45 int dma_len;
46 int num_buffers;
47
48 /* Support for audio timing using a timer, in addition to select() */
49 float frame_ticks;
50 float next_frame;
51 };
52 #define FUDGE_TICKS 10 /* The scheduler overhead ticks per frame */
53
54 /* Old variable names */
55 #define audio_fd (this->hidden->audio_fd)
56 #define parent (this->hidden->parent)
57 #define dma_buf (this->hidden->dma_buf)
58 #define dma_len (this->hidden->dma_len)
59 #define num_buffers (this->hidden->num_buffers)
60 #define frame_ticks (this->hidden->frame_ticks)
61 #define next_frame (this->hidden->next_frame)
62
63 #endif /* _SDL_dspaudio_h */