src/audio/alsa/SDL_alsa_audio.h
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     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 */