src/audio/alsa/SDL_alsa_audio.h
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
changeset 0 74212992fb08
child 252 e8157fcb3114
permissions -rw-r--r--
Initial revision
slouken@0
     1
/*
slouken@0
     2
    SDL - Simple DirectMedia Layer
slouken@0
     3
    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
slouken@0
     4
slouken@0
     5
    This library is free software; you can redistribute it and/or
slouken@0
     6
    modify it under the terms of the GNU Library General Public
slouken@0
     7
    License as published by the Free Software Foundation; either
slouken@0
     8
    version 2 of the License, or (at your option) any later version.
slouken@0
     9
slouken@0
    10
    This library is distributed in the hope that it will be useful,
slouken@0
    11
    but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@0
    12
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@0
    13
    Library General Public License for more details.
slouken@0
    14
slouken@0
    15
    You should have received a copy of the GNU Library General Public
slouken@0
    16
    License along with this library; if not, write to the Free
slouken@0
    17
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
slouken@0
    18
slouken@0
    19
    Sam Lantinga
slouken@0
    20
    slouken@devolution.com
slouken@0
    21
*/
slouken@0
    22
slouken@0
    23
#ifndef _ALSA_PCM_audio_h
slouken@0
    24
#define _ALSA_PCM_audio_h
slouken@0
    25
slouken@0
    26
#include "SDL_sysaudio.h"
slouken@0
    27
#include <sys/asoundlib.h>
slouken@0
    28
slouken@0
    29
/* Hidden "this" pointer for the video functions */
slouken@0
    30
#define _THIS	SDL_AudioDevice *this
slouken@0
    31
slouken@0
    32
struct SDL_PrivateAudioData {
slouken@0
    33
	/* The audio device handle */
slouken@0
    34
	 snd_pcm_t *audio_handle;
slouken@0
    35
slouken@0
    36
	/* The audio file descriptor */
slouken@0
    37
	int audio_fd;
slouken@0
    38
slouken@0
    39
	/* The parent process id, to detect when application quits */
slouken@0
    40
	pid_t parent;
slouken@0
    41
slouken@0
    42
	/* Raw mixing buffer */
slouken@0
    43
	Uint8 *pcm_buf;
slouken@0
    44
	int    pcm_len;
slouken@0
    45
slouken@0
    46
	/* Support for audio timing using a timer, in addition to select() */
slouken@0
    47
	float frame_ticks;
slouken@0
    48
	float next_frame;
slouken@0
    49
};
slouken@0
    50
#define FUDGE_TICKS	10	/* The scheduler overhead ticks per frame */
slouken@0
    51
slouken@0
    52
/* Old variable names */
slouken@0
    53
#define audio_handle	(this->hidden->audio_handle)
slouken@0
    54
#define audio_fd		(this->hidden->audio_fd)
slouken@0
    55
#define parent			(this->hidden->parent)
slouken@0
    56
#define pcm_buf			(this->hidden->pcm_buf)
slouken@0
    57
#define pcm_len			(this->hidden->pcm_len)
slouken@0
    58
#define frame_ticks		(this->hidden->frame_ticks)
slouken@0
    59
#define next_frame		(this->hidden->next_frame)
slouken@0
    60
slouken@0
    61
#endif /* _ALSA_PCM_audio_h */