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mixer.h

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+/*
+ * Copyright 2008-2013 Various Authors
+ * Copyright 2004 Timo Hirvonen
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CMUS_MIXER_H
+#define CMUS_MIXER_H
+
+#ifndef __GNUC__
+#include <fcntl.h>
+#endif
+
+#define NR_MIXER_FDS 4
+
+enum {
+    /* volume changes */
+    MIXER_FDS_VOLUME,
+    /* output changes */
+    MIXER_FDS_OUTPUT
+};
+
+struct mixer_plugin_ops {
+	int (*init)(void);
+	int (*exit)(void);
+	int (*open)(int *volume_max);
+	int (*close)(void);
+	union {
+	    int (*abi_1)(int *fds); // MIXER_FDS_VOLUME
+	    int (*abi_2)(int what, int *fds);
+	} get_fds;
+	int (*set_volume)(int l, int r);
+	int (*get_volume)(int *l, int *r);
+};
+
+struct mixer_plugin_opt {
+	const char *name;
+	int (*set)(const char *val);
+	int (*get)(char **val);
+};
+
+/* symbols exported by plugin */
+extern const struct mixer_plugin_ops op_mixer_ops;
+extern const struct mixer_plugin_opt op_mixer_options[];
+
+#endif