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| -rw-r--r-- | src/decoder/DecoderPlugin.hxx | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/decoder/DecoderPlugin.hxx b/src/decoder/DecoderPlugin.hxx new file mode 100644 index 000000000..dbf3db9aa --- /dev/null +++ b/src/decoder/DecoderPlugin.hxx @@ -0,0 +1,186 @@ +/* + * Copyright (C) 2003-2014 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 "Compiler.h" + +struct config_param; +class InputStream; +struct tag_handler; +class Path; + +/** + * Opaque handle which the decoder plugin passes to the functions in + * this header. + */ +struct Decoder; + +struct DecoderPlugin { + 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)(Decoder &decoder, InputStream &is); + + /** + * Decode a local file. + * + * Either implement this method or stream_decode(). + */ + void (*file_decode)(Decoder &decoder, Path path_fs); + + /** + * Scan metadata of a file. + * + * @return false if the operation has failed + */ + bool (*scan_file)(Path 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)(InputStream &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 + * + * Free the return value with delete[]. + */ + char* (*container_scan)(Path 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 + */ + bool Init(const config_param ¶m) const { + return init != nullptr + ? init(param) + : true; + } + + /** + * Deinitialize a decoder plugin which was initialized successfully. + */ + void Finish() const { + if (finish != nullptr) + finish(); + } + + /** + * Decode a stream. + */ + void StreamDecode(Decoder &decoder, InputStream &is) const { + stream_decode(decoder, is); + } + + /** + * Decode a file. + */ + template<typename P> + void FileDecode(Decoder &decoder, P path_fs) const { + file_decode(decoder, path_fs); + } + + /** + * Read the tag of a file. + */ + template<typename P> + bool ScanFile(P path_fs, + const tag_handler &handler, void *handler_ctx) const { + return scan_file != nullptr + ? scan_file(path_fs, &handler, handler_ctx) + : false; + } + + /** + * Read the tag of a stream. + */ + bool ScanStream(InputStream &is, + const tag_handler &handler, void *handler_ctx) const { + return scan_stream != nullptr + ? scan_stream(is, &handler, handler_ctx) + : false; + } + + /** + * return "virtual" tracks in a container + */ + template<typename P> + char *ContainerScan(P path, const unsigned int tnum) const { + return container_scan(path, tnum); + } + + /** + * Does the plugin announce the specified file name suffix? + */ + gcc_pure gcc_nonnull_all + bool SupportsSuffix(const char *suffix) const; + + /** + * Does the plugin announce the specified MIME type? + */ + gcc_pure gcc_nonnull_all + bool SupportsMimeType(const char *mime_type) const; +}; + +#endif |