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/*
* Copyright 2024 ailurux <ailuruxx@gmail.com>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#pragma once
#include <string>
#include <variant>
#include "ff.h"
#include "database/database.hpp"
#include "database/track.hpp"
namespace audio {
/*
* Owns and manages a playlist file.
* Each line in the playlist file is the absolute filepath of the track to play.
* In order to avoid mapping to byte offsets, each line must contain only a
* filepath (ie, no comments are supported). This limitation may be removed
* later if benchmarks show that the file can be quickly scanned from 'bookmark'
* offsets. This is a subset of the m3u format and ideally will be
* import/exportable to and from this format, to better support playlists from
* beets import and other music management software.
*/
class Playlist {
public:
Playlist(const std::string& playlistFilepath);
virtual ~Playlist();
using Item =
std::variant<database::TrackId, database::TrackIterator, std::string>;
virtual auto open() -> bool;
auto filepath() const -> std::string;
auto currentPosition() const -> size_t;
auto size() const -> size_t;
auto value() const -> std::string;
auto atEnd() const -> bool;
auto next() -> void;
auto prev() -> void;
auto skipTo(size_t position) -> void;
auto serialiseCache() -> bool;
auto deserialiseCache() -> bool;
auto close() -> void;
protected:
const std::string filepath_;
mutable std::mutex mutex_;
size_t total_size_;
ssize_t pos_;
FIL file_;
bool file_open_;
bool file_error_;
std::string current_value_;
/* List of offsets determined by sample size */
std::pmr::vector<FSIZE_t> offset_cache_;
/*
* How many tracks per offset saved (ie, a value of 100 means every 100 tracks
* the file offset is saved) This speeds up searches, especially in the case
* of shuffling a lot of tracks.
*/
const uint32_t sample_size_;
protected:
auto skipToLocked(size_t position) -> void;
auto countItems() -> void;
auto advanceBy(ssize_t amt) -> bool;
auto nextItem(std::span<TCHAR>) -> std::optional<std::string_view>;
auto skipToWithoutCache(size_t position) -> void;
};
class MutablePlaylist : public Playlist {
public:
MutablePlaylist(const std::string& playlistFilepath);
auto open() -> bool override;
auto clear() -> bool;
auto append(Item i) -> void;
private:
auto clearLocked() -> bool;
};
} // namespace audio
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