* 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 <stdio.h>
-#include <string.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <stddef.h>
-#include <sys/ioctl.h>
+#include "common.h"
#include "configuration.h"
#include "mixer.h"
#include "log.h"
-#include "syscalls.h"
+#include "mem.h"
+
+/** @brief Whether lack of volume support has been reported yet */
+static int none_reported;
+
+/** @brief Get/set volume stub if volume control is not supported */
+static int none_get_set(int attribute((unused)) *left,
+ int attribute((unused)) *right) {
+ if(!none_reported) {
+ error(0, "don't know how to get/set volume with this api");
+ none_reported = 1;
+ }
+ return -1;
+}
+/** @brief Stub mixer control */
+static const struct mixer mixer_none = {
+ -1,
+ none_get_set,
+ none_get_set,
+ "",
+ ""
+};
+
+/** @brief Table of mixer definitions */
static const struct mixer *mixers[] = {
#if HAVE_SYS_SOUNDCARD_H
- &mixer_oss
+ &mixer_oss,
#endif
+#if HAVE_ALSA_ASOUNDLIB_H
+ &mixer_alsa,
+#endif
+ &mixer_none /* make sure array is never empty */
};
+/** @brief Number of mixer definitions */
#define NMIXERS (sizeof mixers / sizeof *mixers)
+/** @brief Find the mixer definition */
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 0;
-}
-
-int mixer_valid_channel(int api, const char *c) {
- const struct mixer *const m = find_mixer(api);
-
- return m ? m->validate_channel(c) : 1;
+ return &mixer_none;
}
-int mixer_valid_device(int api, const char *d) {
- const struct mixer *const m = find_mixer(api);
-
- return m ? m->validate_device(d) : 1;
-}
-
-int mixer_control(int *left, int *right, int set) {
- const struct mixer *const m = find_mixer(config->api);
-
- if(m) {
- if(set)
- return m->set(left, right);
- else
- return m->get(left, right);
- } else {
- static int reported;
-
- if(!reported) {
- error(0, "don't know how to get/set volume with this api");
- reported = 1;
- }
- return -1;
- }
-}
-
-const char *mixer_default_device(int api) {
+/** @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 ? m->device : "";
+ return m != &mixer_none;
}
-const char *mixer_default_channel(int api) {
+/** @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
+ * @return 0 on success, non-0 on error
+ *
+ * If getting the volume then @p left and @p right are filled in.
+ *
+ * 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 api, int *left, int *right, int set) {
const struct mixer *const m = find_mixer(api);
- return m ? m->channel : "";
+ /* We impose defaults bizarrely late, but this has the advantage of
+ * not making everything depend on sound libraries */
+ if(!config->mixer)
+ config->mixer = xstrdup(m->device);
+ if(!config->channel)
+ config->channel = xstrdup(m->channel);
+ if(set)
+ return m->set(left, right);
+ else
+ return m->get(left, right);
}
/*
~mdw / disorder / blobdiff