234 lines
7.1 KiB
C++
234 lines
7.1 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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/*
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* Saving and loading the playlist to/from the state file.
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*
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*/
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#include "PlaylistState.hxx"
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#include "PlaylistError.hxx"
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#include "Playlist.hxx"
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#include "SingleMode.hxx"
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#include "StateFileConfig.hxx"
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#include "Save.hxx"
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#include "io/LineReader.hxx"
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#include "io/BufferedOutputStream.hxx"
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#include "player/Control.hxx"
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#include "util/CharUtil.hxx"
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#include "util/StringAPI.hxx"
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#include "util/StringCompare.hxx"
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#include "util/CNumberParser.hxx"
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#include "Log.hxx"
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#include <fmt/format.h>
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#include <string.h>
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#include <stdlib.h>
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#define PLAYLIST_STATE_FILE_STATE "state: "
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#define PLAYLIST_STATE_FILE_RANDOM "random: "
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#define PLAYLIST_STATE_FILE_REPEAT "repeat: "
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#define PLAYLIST_STATE_FILE_SINGLE "single: "
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#define PLAYLIST_STATE_FILE_CONSUME "consume: "
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#define PLAYLIST_STATE_FILE_CURRENT "current: "
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#define PLAYLIST_STATE_FILE_TIME "time: "
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#define PLAYLIST_STATE_FILE_CROSSFADE "crossfade: "
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#define PLAYLIST_STATE_FILE_MIXRAMPDB "mixrampdb: "
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#define PLAYLIST_STATE_FILE_MIXRAMPDELAY "mixrampdelay: "
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#define PLAYLIST_STATE_FILE_PLAYLIST_BEGIN "playlist_begin"
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#define PLAYLIST_STATE_FILE_PLAYLIST_END "playlist_end"
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#define PLAYLIST_STATE_FILE_STATE_PLAY "play"
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#define PLAYLIST_STATE_FILE_STATE_PAUSE "pause"
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#define PLAYLIST_STATE_FILE_STATE_STOP "stop"
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void
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playlist_state_save(BufferedOutputStream &os, const struct playlist &playlist,
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PlayerControl &pc)
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{
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const auto player_status = pc.LockGetStatus();
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os.Write(PLAYLIST_STATE_FILE_STATE);
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if (playlist.playing) {
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switch (player_status.state) {
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case PlayerState::PAUSE:
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os.Write(PLAYLIST_STATE_FILE_STATE_PAUSE "\n");
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break;
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default:
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os.Write(PLAYLIST_STATE_FILE_STATE_PLAY "\n");
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}
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_CURRENT "{}\n"),
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playlist.queue.OrderToPosition(playlist.current));
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_TIME "{}\n"),
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player_status.elapsed_time.ToDoubleS());
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} else {
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os.Write(PLAYLIST_STATE_FILE_STATE_STOP "\n");
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if (playlist.current >= 0)
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_CURRENT "{}\n"),
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playlist.queue.OrderToPosition(playlist.current));
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}
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_RANDOM "{}\n"),
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(unsigned)playlist.queue.random);
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_REPEAT "{}\n"),
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(unsigned)playlist.queue.repeat);
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_SINGLE "{}\n"),
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SingleToString(playlist.queue.single));
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_CONSUME "{}\n"),
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ConsumeToString(playlist.queue.consume));
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_CROSSFADE "{}\n"),
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pc.GetCrossFade().count());
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_MIXRAMPDB "{}\n"),
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pc.GetMixRampDb());
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os.Fmt(FMT_STRING(PLAYLIST_STATE_FILE_MIXRAMPDELAY "{}\n"),
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pc.GetMixRampDelay().count());
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os.Write(PLAYLIST_STATE_FILE_PLAYLIST_BEGIN "\n");
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queue_save(os, playlist.queue);
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os.Write(PLAYLIST_STATE_FILE_PLAYLIST_END "\n");
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}
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static void
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playlist_state_load(LineReader &file, const SongLoader &song_loader,
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struct playlist &playlist)
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{
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const char *line = file.ReadLine();
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if (line == nullptr) {
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LogWarning(playlist_domain, "No playlist in state file");
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return;
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}
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while (!StringStartsWith(line, PLAYLIST_STATE_FILE_PLAYLIST_END)) {
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queue_load_song(file, song_loader, line, playlist.queue);
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line = file.ReadLine();
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if (line == nullptr) {
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LogWarning(playlist_domain,
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"'" PLAYLIST_STATE_FILE_PLAYLIST_END
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"' not found in state file");
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break;
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}
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}
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playlist.queue.IncrementVersion();
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}
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bool
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playlist_state_restore(const StateFileConfig &config,
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const char *line, LineReader &file,
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const SongLoader &song_loader,
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struct playlist &playlist, PlayerControl &pc)
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{
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int current = -1;
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SongTime seek_time = SongTime::zero();
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bool random_mode = false;
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line = StringAfterPrefix(line, PLAYLIST_STATE_FILE_STATE);
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if (line == nullptr)
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return false;
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PlayerState state;
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if (strcmp(line, PLAYLIST_STATE_FILE_STATE_PLAY) == 0)
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state = PlayerState::PLAY;
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else if (strcmp(line, PLAYLIST_STATE_FILE_STATE_PAUSE) == 0)
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state = PlayerState::PAUSE;
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else
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state = PlayerState::STOP;
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while ((line = file.ReadLine()) != nullptr) {
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const char *p;
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if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_TIME))) {
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seek_time = SongTime::FromS(ParseDouble(p));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_REPEAT))) {
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playlist.SetRepeat(pc, StringIsEqual(p, "1"));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_SINGLE))) {
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playlist.SetSingle(pc, SingleFromString(p));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_CONSUME))) {
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playlist.SetConsume(ConsumeFromString(p));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_CROSSFADE))) {
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pc.SetCrossFade(FloatDuration(atoi(p)));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_MIXRAMPDB))) {
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pc.SetMixRampDb(ParseFloat(p));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_MIXRAMPDELAY))) {
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/* this check discards "nan" which was used
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prior to MPD 0.18 */
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if (IsDigitASCII(*p))
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pc.SetMixRampDelay(FloatDuration(ParseFloat(p)));
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_RANDOM))) {
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random_mode = StringIsEqual(p, "1");
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} else if ((p = StringAfterPrefix(line, PLAYLIST_STATE_FILE_CURRENT))) {
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current = atoi(p);
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} else if (StringStartsWith(line,
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PLAYLIST_STATE_FILE_PLAYLIST_BEGIN)) {
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playlist_state_load(file, song_loader, playlist);
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}
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}
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playlist.SetRandom(pc, random_mode);
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if (!playlist.queue.IsEmpty()) {
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if (!playlist.queue.IsValidPosition(current))
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current = 0;
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if (state == PlayerState::PLAY && config.restore_paused)
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/* the user doesn't want MPD to auto-start
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playback after startup; fall back to
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"pause" */
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state = PlayerState::PAUSE;
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/* enable all devices for the first time; this must be
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called here, after the audio output states were
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restored, before playback begins */
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if (state != PlayerState::STOP)
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pc.LockUpdateAudio();
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if (state == PlayerState::STOP /* && config_option */)
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playlist.current = current;
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else if (seek_time.count() == 0) {
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try {
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playlist.PlayPosition(pc, current);
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} catch (...) {
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/* TODO: log error? */
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}
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} else {
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try {
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playlist.SeekSongPosition(pc, current,
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seek_time);
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} catch (...) {
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/* TODO: log error? */
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}
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}
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if (state == PlayerState::PAUSE)
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pc.LockPause();
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}
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return true;
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}
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unsigned
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playlist_state_get_hash(const playlist &playlist,
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PlayerControl &pc)
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{
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const auto player_status = pc.LockGetStatus();
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return playlist.queue.version ^
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(player_status.state != PlayerState::STOP
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? (player_status.elapsed_time.ToS() << 8)
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: 0) ^
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(playlist.current >= 0
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? (playlist.queue.OrderToPosition(playlist.current) << 16)
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: 0) ^
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((int)pc.GetCrossFade().count() << 20) ^
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(unsigned(player_status.state) << 24) ^
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/* note that this takes 2 bits */
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((int)playlist.queue.single << 25) ^
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(playlist.queue.random << 27) ^
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(playlist.queue.repeat << 28) ^
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/* note that this takes 2 bits */
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((int)playlist.queue.consume << 29) ^
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(playlist.queue.random << 31);
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}
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