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op.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_OP_H
+#define CMUS_OP_H
+
+#include "sf.h"
+#include "channelmap.h"
+
+#ifndef __GNUC__
+#include <fcntl.h>
+#endif
+
+#define OP_ABI_VERSION 3
+
+enum {
+	/* no error */
+	OP_ERROR_SUCCESS,
+	/* system error (error code in errno) */
+	OP_ERROR_ERRNO,
+	/* no such plugin */
+	OP_ERROR_NO_PLUGIN,
+	/* plugin not initialized */
+	OP_ERROR_NOT_INITIALIZED,
+	/* function not supported */
+	OP_ERROR_NOT_SUPPORTED,
+	/* mixer not open */
+	OP_ERROR_NOT_OPEN,
+	/* plugin does not support the sample format */
+	OP_ERROR_SAMPLE_FORMAT,
+	/* plugin does not have this option */
+	OP_ERROR_NOT_OPTION,
+	/*  */
+	OP_ERROR_INTERNAL
+};
+
+struct output_plugin_ops {
+	int (*init)(void);
+	int (*exit)(void);
+	int (*open)(sample_format_t sf, const channel_position_t *channel_map);
+	int (*close)(void);
+	int (*drop)(void);
+	int (*write)(const char *buffer, int count);
+	int (*buffer_space)(void);
+
+	/* these can be NULL */
+	int (*pause)(void);
+	int (*unpause)(void);
+
+};
+
+#define OPT(prefix, name) { #name, prefix ## _set_ ## name, \
+	prefix ## _get_ ## name }
+
+struct output_plugin_opt {
+	const char *name;
+	int (*set)(const char *val);
+	int (*get)(char **val);
+};
+
+/* symbols exported by plugin */
+extern const struct output_plugin_ops op_pcm_ops;
+extern const struct output_plugin_opt op_pcm_options[];
+extern const int op_priority;
+extern const unsigned op_abi_version;
+
+#endif