X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/b25aac593c0321473525a3e5b12f406bd3961aec..401d3485a7923ae9b83b23399bee0ef8d19d0444:/lib/mixer.c

diff --git a/lib/mixer.c b/lib/mixer.c
index 58d9e60..a24f7eb 100644
--- a/lib/mixer.c
+++ b/lib/mixer.c
@@ -2,27 +2,24 @@
  * This file is part of DisOrder
  * Copyright (C) 2007 Richard Kettlewell
  *
- * This program is free software; you can redistribute it and/or modify
+ * 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
+ * the Free Software Foundation, either version 3 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.
- *
+ * 
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 /** @file lib/mixer.c
  * @brief Mixer support
  */
 
-#include <config.h>
-#include "types.h"
+#include "common.h"
 
 #include "configuration.h"
 #include "mixer.h"
@@ -69,13 +66,25 @@ static const struct mixer *mixers[] = {
 static const struct mixer *find_mixer(int api) {
   size_t n;
 
+  if(api == -1)
+    api = config->api;
   for(n = 0; n < NMIXERS; ++n)
     if(mixers[n]->api == api)
       return mixers[n];
   return &mixer_none;
 }
 
+/** @brief Return true if we know how to drive the mixer
+ * @param api Sound api or -1 for default
+ * @return true if suppored, false otherwise
+ */
+int mixer_supported(int api) {
+  const struct mixer *const m = find_mixer(api);
+  return m != &mixer_none;
+}
+
 /** @brief Get/set volume
+ * @param api Sound api or -1 for default
  * @param left Left channel level, 0-100
  * @param right Right channel level, 0-100
  * @param set Set volume if non-0
@@ -86,8 +95,8 @@ static const struct mixer *find_mixer(int api) {
  * If setting the volume then the target levels are read from @p left and
  * @p right, and the actual level set is stored in them.
  */
-int mixer_control(int *left, int *right, int set) {
-  const struct mixer *const m = find_mixer(config->api);
+int mixer_control(int api, int *left, int *right, int set) {
+  const struct mixer *const m = find_mixer(api);
 
   /* We impose defaults bizarrely late, but this has the advantage of
    * not making everything depend on sound libraries */