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Diffstat (limited to 'src/playlist/plugins/EmbeddedCuePlaylistPlugin.cxx')
| -rw-r--r-- | src/playlist/plugins/EmbeddedCuePlaylistPlugin.cxx | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/playlist/plugins/EmbeddedCuePlaylistPlugin.cxx b/src/playlist/plugins/EmbeddedCuePlaylistPlugin.cxx new file mode 100644 index 000000000..53f3feda0 --- /dev/null +++ b/src/playlist/plugins/EmbeddedCuePlaylistPlugin.cxx @@ -0,0 +1,184 @@ +/* + * 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. + */ + +/** \file + * + * Playlist plugin that reads embedded cue sheets from the "CUESHEET" + * tag of a music file. + */ + +#include "config.h" +#include "EmbeddedCuePlaylistPlugin.hxx" +#include "../PlaylistPlugin.hxx" +#include "../SongEnumerator.hxx" +#include "tag/TagHandler.hxx" +#include "tag/TagId3.hxx" +#include "tag/ApeTag.hxx" +#include "DetachedSong.hxx" +#include "TagFile.hxx" +#include "cue/CueParser.hxx" +#include "fs/Traits.hxx" +#include "fs/AllocatedPath.hxx" +#include "util/ASCII.hxx" + +#include <string.h> + +class EmbeddedCuePlaylist final : public SongEnumerator { +public: + /** + * This is an override for the CUE's "FILE". An embedded CUE + * sheet must always point to the song file it is contained + * in. + */ + std::string filename; + + /** + * The value of the file's "CUESHEET" tag. + */ + std::string cuesheet; + + /** + * The offset of the next line within "cuesheet". + */ + char *next; + + CueParser *parser; + +public: + EmbeddedCuePlaylist() + :parser(nullptr) { + } + + virtual ~EmbeddedCuePlaylist() { + delete parser; + } + + virtual DetachedSong *NextSong() override; +}; + +static void +embcue_tag_pair(const char *name, const char *value, void *ctx) +{ + EmbeddedCuePlaylist *playlist = (EmbeddedCuePlaylist *)ctx; + + if (playlist->cuesheet.empty() && + StringEqualsCaseASCII(name, "cuesheet")) + playlist->cuesheet = value; +} + +static const struct tag_handler embcue_tag_handler = { + nullptr, + nullptr, + embcue_tag_pair, +}; + +static SongEnumerator * +embcue_playlist_open_uri(const char *uri, + gcc_unused Mutex &mutex, + gcc_unused Cond &cond) +{ + if (!PathTraitsUTF8::IsAbsolute(uri)) + /* only local files supported */ + return nullptr; + + const auto path_fs = AllocatedPath::FromUTF8(uri); + if (path_fs.IsNull()) + return nullptr; + + const auto playlist = new EmbeddedCuePlaylist(); + + tag_file_scan(path_fs, embcue_tag_handler, playlist); + if (playlist->cuesheet.empty()) { + tag_ape_scan2(path_fs, &embcue_tag_handler, playlist); + if (playlist->cuesheet.empty()) + tag_id3_scan(path_fs, &embcue_tag_handler, playlist); + } + + if (playlist->cuesheet.empty()) { + /* no "CUESHEET" tag found */ + delete playlist; + return nullptr; + } + + playlist->filename = PathTraitsUTF8::GetBase(uri); + + playlist->next = &playlist->cuesheet[0]; + playlist->parser = new CueParser(); + + return playlist; +} + +DetachedSong * +EmbeddedCuePlaylist::NextSong() +{ + DetachedSong *song = parser->Get(); + if (song != nullptr) + return song; + + while (*next != 0) { + const char *line = next; + char *eol = strpbrk(next, "\r\n"); + if (eol != nullptr) { + /* null-terminate the line */ + *eol = 0; + next = eol + 1; + } else + /* last line; put the "next" pointer to the + end of the buffer */ + next += strlen(line); + + parser->Feed(line); + song = parser->Get(); + if (song != nullptr) { + song->SetURI(filename); + return song; + } + } + + parser->Finish(); + song = parser->Get(); + if (song != nullptr) + song->SetURI(filename); + return song; +} + +static const char *const embcue_playlist_suffixes[] = { + /* a few codecs that are known to be supported; there are + probably many more */ + "flac", + "mp3", "mp2", + "mp4", "mp4a", "m4b", + "ape", + "wv", + "ogg", "oga", + nullptr +}; + +const struct playlist_plugin embcue_playlist_plugin = { + "cue", + + nullptr, + nullptr, + embcue_playlist_open_uri, + nullptr, + + embcue_playlist_suffixes, + nullptr, + nullptr, +}; |