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Diffstat (limited to 'src/sys/alsa/init.c')
-rw-r--r-- | src/sys/alsa/init.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/sys/alsa/init.c b/src/sys/alsa/init.c new file mode 100644 index 0000000..88a0d87 --- /dev/null +++ b/src/sys/alsa/init.c @@ -0,0 +1,73 @@ +/* + * Schism Tracker - a cross-platform Impulse Tracker clone + * copyright (c) 2003-2005 Storlek <storlek@rigelseven.com> + * copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org> + * copyright (c) 2009 Storlek & Mrs. Brisby + * copyright (c) 2010-2012 Storlek + * URL: http://schismtracker.org/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* Here be demons. */ + +#include "headers.h" +#include "util.h" +#include "osdefs.h" + +#if defined(USE_DLTRICK_ALSA) +# include <dlfcn.h> +void *_dltrick_handle = NULL; +static void *_alsaless_sdl_hack = NULL; +#else +# error You are in a maze of twisty little passages, all alike. +#endif + +/* --------------------------------------------------------------------- */ + +void alsa_dlinit(void) +{ + /* okay, this is how this works: + * to operate the alsa mixer and alsa midi, we need functions in + * libasound.so.2 -- if we can do that, *AND* libSDL has the + * ALSA_bootstrap routine- then SDL was built with alsa-support- + * which means schism can probably use ALSA - so we set that as the + * default here. + */ + _dltrick_handle = dlopen("libasound.so.2", RTLD_NOW); + if (!_dltrick_handle) + _dltrick_handle = dlopen("libasound.so", RTLD_NOW); + if (!getenv("SDL_AUDIODRIVER")) { + _alsaless_sdl_hack = dlopen("libSDL-1.2.so.0", RTLD_NOW); + if (!_alsaless_sdl_hack) + _alsaless_sdl_hack = RTLD_DEFAULT; + +#if 0 + if (_dltrick_handle && _alsaless_sdl_hack + && (dlsym(_alsaless_sdl_hack, "ALSA_bootstrap") + || dlsym(_alsaless_sdl_hack, "snd_pcm_open"))) { + static int (*alsa_snd_pcm_open)(void **pcm, + const char *name, + int stream, + int mode); + static int (*alsa_snd_pcm_close)(void *pcm); + + alsa_snd_pcm_open = dlsym(_dltrick_handle, "snd_pcm_open"); + alsa_snd_pcm_close = dlsym(_dltrick_handle, "snd_pcm_close"); + } +#endif + } +} + |