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| -rw-r--r-- | src/DecoderPlugin.hxx | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/DecoderPlugin.hxx b/src/DecoderPlugin.hxx new file mode 100644 index 000000000..693b8feee --- /dev/null +++ b/src/DecoderPlugin.hxx @@ -0,0 +1,204 @@ +/* + * 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 + +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 nullptr + * if none is configured + * @return true if the plugin was initialized successfully, + * false if the plugin is not available + */ + bool (*init)(const config_param ¶m); + + /** + * 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 nullptr 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 nullptr: */ + const char *const*suffixes; + const char *const*mime_types; +}; + +/** + * Initialize a decoder plugin. + * + * @param param a configuration block for this plugin, or nullptr 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 config_param ¶m) +{ + return plugin->init != nullptr + ? 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 != nullptr) + 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 != nullptr + ? 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 != nullptr + ? 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); +} + +/** + * 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); + +#endif |