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comparison src/audio/alsa/SDL_alsa_audio.h @ 354:30935e76acb5

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Updated ALSA audio support for ALSA 0.9
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Apr 2002 07:38:54 +0000
parents f6ffac90895c
children 4f46fee887fe
comparison
equal deleted inserted replaced
353:d47637068e52 354:30935e76acb5
22 22
23 #ifndef _ALSA_PCM_audio_h 23 #ifndef _ALSA_PCM_audio_h
24 #define _ALSA_PCM_audio_h 24 #define _ALSA_PCM_audio_h
25 25
26 #include "SDL_sysaudio.h" 26 #include "SDL_sysaudio.h"
27 #include <sys/asoundlib.h> 27 #include <alsa/asoundlib.h>
28 28
29 /* Hidden "this" pointer for the video functions */ 29 /* Hidden "this" pointer for the video functions */
30 #define _THIS SDL_AudioDevice *this 30 #define _THIS SDL_AudioDevice *this
31 31
32 struct SDL_PrivateAudioData { 32 struct SDL_PrivateAudioData {
33 /* The audio device handle */ 33 /* The audio device handle */
34 snd_pcm_t *audio_handle; 34 snd_pcm_t *pcm_handle;
35
36 /* The audio file descriptor */
37 int audio_fd;
38 35
39 /* The parent process id, to detect when application quits */ 36 /* The parent process id, to detect when application quits */
40 pid_t parent; 37 pid_t parent;
41 38
42 /* Raw mixing buffer */ 39 /* Raw mixing buffer */
43 Uint8 *pcm_buf; 40 Uint8 *mixbuf;
44 int pcm_len; 41 int mixlen;
45
46 /* Support for audio timing using a timer, in addition to select() */
47 float frame_ticks;
48 float next_frame;
49 }; 42 };
50 #define FUDGE_TICKS 10 /* The scheduler overhead ticks per frame */
51 43
52 /* Old variable names */ 44 /* Old variable names */
53 #define audio_handle (this->hidden->audio_handle) 45 #define pcm_handle (this->hidden->pcm_handle)
54 #define audio_fd (this->hidden->audio_fd)
55 #define parent (this->hidden->parent) 46 #define parent (this->hidden->parent)
56 #define pcm_buf (this->hidden->pcm_buf) 47 #define mixbuf (this->hidden->mixbuf)
57 #define pcm_len (this->hidden->pcm_len) 48 #define mixlen (this->hidden->mixlen)
58 #define frame_ticks (this->hidden->frame_ticks)
59 #define next_frame (this->hidden->next_frame)
60 49
61 #endif /* _ALSA_PCM_audio_h */ 50 #endif /* _ALSA_PCM_audio_h */