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