Mercurial > sdl-ios-xcode
comparison src/audio/alsa/SDL_alsa_audio.h @ 0:74212992fb08
Initial revision
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Thu, 26 Apr 2001 16:45:43 +0000 |
| parents | |
| children | e8157fcb3114 |
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| -1:000000000000 | 0:74212992fb08 |
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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 */ |