src/audio/alsa/SDL_alsa_audio.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 #ifndef _ALSA_PCM_audio_h
24 #define _ALSA_PCM_audio_h
25
26 #include "SDL_sysaudio.h"
27 #include <sys/asoundlib.h>
28
29 /* Hidden "this" pointer for the video functions */
30 #define _THIS SDL_AudioDevice *this
31
32 struct SDL_PrivateAudioData {
33 /* The audio device handle */
34 snd_pcm_t *audio_handle;
35
36 /* The audio file descriptor */
37 int audio_fd;
38
39 /* The parent process id, to detect when application quits */
40 pid_t parent;
41
42 /* Raw mixing buffer */
43 Uint8 *pcm_buf;
44 int pcm_len;
45
46 /* Support for audio timing using a timer, in addition to select() */
47 float frame_ticks;
48 float next_frame;
49 };
50 #define FUDGE_TICKS 10 /* The scheduler overhead ticks per frame */
51
52 /* Old variable names */
53 #define audio_handle (this->hidden->audio_handle)
54 #define audio_fd (this->hidden->audio_fd)
55 #define parent (this->hidden->parent)
56 #define pcm_buf (this->hidden->pcm_buf)
57 #define pcm_len (this->hidden->pcm_len)
58 #define frame_ticks (this->hidden->frame_ticks)
59 #define next_frame (this->hidden->next_frame)
60
61 #endif /* _ALSA_PCM_audio_h */