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/*
* Copyright 2003-2020 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 "EmbeddedCuePlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../SongEnumerator.hxx"
#include "../cue/CueParser.hxx"
#include "tag/Handler.hxx"
#include "tag/Generic.hxx"
#include "song/DetachedSong.hxx"
#include "TagFile.hxx"
#include "fs/Traits.hxx"
#include "fs/AllocatedPath.hxx"
#include "util/StringView.hxx"
#include <memory>
#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;
std::unique_ptr<CueParser> parser;
std::unique_ptr<DetachedSong> NextSong() override;
};
class ExtractCuesheetTagHandler final : public NullTagHandler {
public:
std::string cuesheet;
ExtractCuesheetTagHandler() noexcept:NullTagHandler(WANT_PAIR) {}
void OnPair(StringView key, StringView value) noexcept override;
};
void
ExtractCuesheetTagHandler::OnPair(StringView name, StringView value) noexcept
{
if (cuesheet.empty() && name.EqualsIgnoreCase("cuesheet"))
cuesheet = {value.data, value.size};
}
static std::unique_ptr<SongEnumerator>
embcue_playlist_open_uri(const char *uri,
[[maybe_unused]] Mutex &mutex)
{
if (!PathTraitsUTF8::IsAbsolute(uri))
/* only local files supported */
return nullptr;
const auto path_fs = AllocatedPath::FromUTF8Throw(uri);
ExtractCuesheetTagHandler extract_cuesheet;
ScanFileTagsNoGeneric(path_fs, extract_cuesheet);
if (extract_cuesheet.cuesheet.empty())
ScanGenericTags(path_fs, extract_cuesheet);
if (extract_cuesheet.cuesheet.empty())
/* no "CUESHEET" tag found */
return nullptr;
auto playlist = std::make_unique<EmbeddedCuePlaylist>();
playlist->filename = PathTraitsUTF8::GetBase(uri);
playlist->cuesheet = std::move(extract_cuesheet.cuesheet);
playlist->next = &playlist->cuesheet[0];
playlist->parser = std::make_unique<CueParser>();
return playlist;
}
std::unique_ptr<DetachedSong>
EmbeddedCuePlaylist::NextSong()
{
auto song = parser->Get();
if (song != nullptr) {
song->SetURI(filename);
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 PlaylistPlugin embcue_playlist_plugin =
PlaylistPlugin("embcue", embcue_playlist_open_uri)
.WithSuffixes(embcue_playlist_suffixes);
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