decoder_api: convert to C++

src/DecoderPlugin.hxx

@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_PLUGIN_HXX
+#define MPD_DECODER_PLUGIN_HXX
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct config_param;
+struct input_stream;
+struct tag;
+struct tag_handler;
+
+/**
+ * Opaque handle which the decoder plugin passes to the functions in
+ * this header.
+ */
+struct decoder;
+
+struct decoder_plugin {
+	const char *name;
+
+	/**
+	 * Initialize the decoder plugin.  Optional method.
+	 *
+	 * @param param a configuration block for this plugin, or NULL
+	 * if none is configured
+	 * @return true if the plugin was initialized successfully,
+	 * false if the plugin is not available
+	 */
+	bool (*init)(const struct config_param *param);
+
+	/**
+	 * Deinitialize a decoder plugin which was initialized
+	 * successfully.  Optional method.
+	 */
+	void (*finish)(void);
+
+	/**
+	 * Decode a stream (data read from an #input_stream object).
+	 *
+	 * Either implement this method or file_decode().  If
+	 * possible, it is recommended to implement this method,
+	 * because it is more versatile.
+	 */
+	void (*stream_decode)(struct decoder *decoder,
+			      struct input_stream *is);
+
+	/**
+	 * Decode a local file.
+	 *
+	 * Either implement this method or stream_decode().
+	 */
+	void (*file_decode)(struct decoder *decoder, const char *path_fs);
+
+	/**
+	 * Scan metadata of a file.
+	 *
+	 * @return false if the operation has failed
+	 */
+	bool (*scan_file)(const char *path_fs,
+			  const struct tag_handler *handler,
+			  void *handler_ctx);
+
+	/**
+	 * Scan metadata of a file.
+	 *
+	 * @return false if the operation has failed
+	 */
+	bool (*scan_stream)(struct input_stream *is,
+			    const struct tag_handler *handler,
+			    void *handler_ctx);
+
+	/**
+	 * @brief Return a "virtual" filename for subtracks in
+	 * container formats like flac
+	 * @param const char* pathname full pathname for the file on fs
+	 * @param const unsigned int tnum track number
+	 *
+	 * @return NULL if there are no multiple files
+	 * a filename for every single track according to tnum (param 2)
+	 * do not include full pathname here, just the "virtual" file
+	 */
+	char* (*container_scan)(const char *path_fs, const unsigned int tnum);
+
+	/* last element in these arrays must always be a NULL: */
+	const char *const*suffixes;
+	const char *const*mime_types;
+};
+
+/**
+ * Initialize a decoder plugin.
+ *
+ * @param param a configuration block for this plugin, or NULL if none
+ * is configured
+ * @return true if the plugin was initialized successfully, false if
+ * the plugin is not available
+ */
+static inline bool
+decoder_plugin_init(const struct decoder_plugin *plugin,
+		    const struct config_param *param)
+{
+	return plugin->init != NULL
+		? plugin->init(param)
+		: true;
+}
+
+/**
+ * Deinitialize a decoder plugin which was initialized successfully.
+ */
+static inline void
+decoder_plugin_finish(const struct decoder_plugin *plugin)
+{
+	if (plugin->finish != NULL)
+		plugin->finish();
+}
+
+/**
+ * Decode a stream.
+ */
+static inline void
+decoder_plugin_stream_decode(const struct decoder_plugin *plugin,
+			     struct decoder *decoder, struct input_stream *is)
+{
+	plugin->stream_decode(decoder, is);
+}
+
+/**
+ * Decode a file.
+ */
+static inline void
+decoder_plugin_file_decode(const struct decoder_plugin *plugin,
+			   struct decoder *decoder, const char *path_fs)
+{
+	plugin->file_decode(decoder, path_fs);
+}
+
+/**
+ * Read the tag of a file.
+ */
+static inline bool
+decoder_plugin_scan_file(const struct decoder_plugin *plugin,
+			 const char *path_fs,
+			 const struct tag_handler *handler, void *handler_ctx)
+{
+	return plugin->scan_file != NULL
+		? plugin->scan_file(path_fs, handler, handler_ctx)
+		: false;
+}
+
+/**
+ * Read the tag of a stream.
+ */
+static inline bool
+decoder_plugin_scan_stream(const struct decoder_plugin *plugin,
+			   struct input_stream *is,
+			   const struct tag_handler *handler,
+			   void *handler_ctx)
+{
+	return plugin->scan_stream != NULL
+		? plugin->scan_stream(is, handler, handler_ctx)
+		: false;
+}
+
+/**
+ * return "virtual" tracks in a container
+ */
+static inline char *
+decoder_plugin_container_scan(	const struct decoder_plugin *plugin,
+				const char* pathname,
+				const unsigned int tnum)
+{
+	return plugin->container_scan(pathname, tnum);
+}
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Does the plugin announce the specified file name suffix?
+ */
+bool
+decoder_plugin_supports_suffix(const struct decoder_plugin *plugin,
+			       const char *suffix);
+
+/**
+ * Does the plugin announce the specified MIME type?
+ */
+bool
+decoder_plugin_supports_mime_type(const struct decoder_plugin *plugin,
+				  const char *mime_type);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif