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-rw-r--r--src/sys/alsa/init.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/sys/alsa/init.c b/src/sys/alsa/init.c
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+/*
+ * 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
+ }
+}
+
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