First working jukebox using Subsonic API
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emeric
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/*
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* Copyright (C) 2026 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "JukeboxService.hpp"
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#include <chrono>
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#include <format>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/post.hpp>
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#include "core/ILogger.hpp"
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#include "core/Random.hpp"
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#include "audio/Exception.hpp"
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#include "audio/IAudioOutput.hpp"
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#include "database/IDb.hpp"
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#include "database/Session.hpp"
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#include "database/objects/Track.hpp"
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namespace lms::jukebox
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{
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std::unique_ptr<IJukeboxService> createJukeboxService(db::IDb& db, audio::AudioOutputBackend backend)
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{
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return std::make_unique<JukeboxService>(db, backend);
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}
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JukeboxService::JukeboxService(db::IDb& db, audio::AudioOutputBackend backend)
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: _ioContextRunner{ _ioContext, 1, "Jukebox" }
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, _db{ db }
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, _outputContext{ audio::createAudioOutputContext(_ioContext, "LMS-Jukebox", backend) }
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{
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LMS_LOG(JUKEBOX, INFO, "Starting service...");
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// TODO create a context and an output stream only if a song is actually played
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_outputContext->asyncWaitReady([this] { onContextReady(); });
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}
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JukeboxService::~JukeboxService()
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{
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LMS_LOG(JUKEBOX, INFO, "Stopping service...");
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if (_decoder)
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_decoder->abort();
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if (_outputStream)
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_outputStream->flush();
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_ioContextRunner.wait();
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LMS_LOG(JUKEBOX, INFO, "Service stopped!");
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}
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void JukeboxService::play(std::size_t trackIndex, std::chrono::microseconds offset)
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{
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LMS_LOG(JUKEBOX, INFO, "Playing track index " << trackIndex << " at offset " << std::format("{:%T}", offset));
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std::unique_lock lock{ _mutex };
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deleteDecoder();
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if (trackIndex >= _tracks.size())
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{
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LMS_LOG(JUKEBOX, INFO, "Requested track index out of bound: stopping");
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_currentTrackIndex.reset();
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return;
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}
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if (createDecoder(trackIndex, offset))
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{
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_currentTrackIndex = trackIndex;
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_currentTrackPlaybackTimeOffset = _outputStream->getPlaybackTime();
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_currentTrackStartTimeOffset = offset;
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startDecoder();
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_outputStream->resume();
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}
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// TODO if failure, switch to the next song?
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}
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void JukeboxService::pause()
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{
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std::unique_lock lock{ _mutex };
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if (_outputStream)
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_outputStream->pause();
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}
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void JukeboxService::resume()
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{
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std::unique_lock lock{ _mutex };
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if (_outputStream)
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_outputStream->resume();
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}
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bool JukeboxService::isPaused() const
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{
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std::shared_lock lock{ _mutex };
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if (!_outputStream)
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return true;
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return _outputStream->isPaused();
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}
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std::optional<std::size_t> JukeboxService::getCurrentTrackIndex() const
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{
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std::shared_lock lock{ _mutex };
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return _currentTrackIndex;
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}
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std::chrono::microseconds JukeboxService::getPlaybackTrackTime() const
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{
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std::shared_lock lock{ _mutex };
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if (!_outputStream)
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return {};
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const auto playbackTime{ _outputStream->getPlaybackTime() };
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// If negative, this means we are still playing the buffered previous song, just report 0 as:
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// - the time window should be short enough to be ok-ish for the usage
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// - we would need to save back the previous track info (index, duration, start offset, etc.) and report accordingly in getCurrentTrackIndex
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if (playbackTime < _currentTrackPlaybackTimeOffset)
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return {};
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return playbackTime - _currentTrackPlaybackTimeOffset + _currentTrackStartTimeOffset;
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}
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void JukeboxService::clearTracks()
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{
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std::unique_lock lock{ _mutex };
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_tracks.clear();
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_currentTrackIndex.reset();
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}
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void JukeboxService::removeTrack(std::size_t index)
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{
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std::unique_lock lock{ _mutex };
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if (index >= _tracks.size())
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return;
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if (_currentTrackIndex)
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{
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if (*_currentTrackIndex == index)
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_currentTrackIndex.reset();
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else if (*_currentTrackIndex > index)
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(*_currentTrackIndex)--;
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}
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_tracks.erase(std::next(_tracks.begin(), index));
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}
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void JukeboxService::appendTracks(std::span<const db::TrackId> tracks)
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{
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LMS_LOG(JUKEBOX, INFO, "Appending " << tracks.size() << " tracks");
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std::unique_lock lock{ _mutex };
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_tracks.insert(std::end(_tracks), std::cbegin(tracks), std::cend(tracks));
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}
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void JukeboxService::shuffleTracks()
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{
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std::unique_lock lock{ _mutex };
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core::random::shuffleContainer(_tracks);
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// can't really determine the new pos if the song has been enqueued several times
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_currentTrackIndex.reset();
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}
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std::vector<db::TrackId> JukeboxService::getTracks() const
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{
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std::shared_lock lock{ _mutex };
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return _tracks;
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}
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void JukeboxService::onContextReady()
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{
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_outputStream = _outputContext->createOutputStream("LMS-jukebox", _pcmParams);
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_outputStream->asyncWaitReady([this] { onStreamReady(); });
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}
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void JukeboxService::onStreamReady()
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{
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}
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bool JukeboxService::createDecoder(std::size_t trackIndex, std::chrono::microseconds offset)
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{
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std::filesystem::path trackPath;
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{
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auto& session{ _db.getTLSSession() };
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auto transaction{ session.createReadTransaction() };
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const db::Track::pointer track{ db::Track::find(session, _tracks.at(trackIndex)) };
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if (!track)
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{
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LMS_LOG(JUKEBOX, DEBUG, "Track ID " << _tracks.at(trackIndex).getValue() << " not found");
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return false;
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}
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trackPath = track->getAbsoluteFilePath();
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}
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try
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{
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audio::utils::PcmDecodeStreamerParameters params{
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.outputStream = *_outputStream,
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.file = trackPath,
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.offset = offset,
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.pcmParameters = _pcmParams,
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};
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_decoder = audio::utils::createPcmDecodeStreamer(_ioContext, params);
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}
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catch (const audio::Exception& e)
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{
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LMS_LOG(JUKEBOX, ERROR, "Failed to create PCM decoder for track " << trackPath);
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return false;
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}
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return true;
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}
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void JukeboxService::deleteDecoder()
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{
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if (_decoder)
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{
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_decoder->abort();
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_decoder.reset();
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}
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}
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void JukeboxService::startDecoder()
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{
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_decoder->start([this](bool aborted) {
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onDecodeFinished(aborted);
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});
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}
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void JukeboxService::onDecodeFinished(bool aborted)
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{
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if (aborted)
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return; // already setup to play next song
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std::unique_lock lock{ _mutex };
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_decoder.reset();
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if (!_currentTrackIndex)
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{
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_outputStream->pause();
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return;
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}
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if (++(*_currentTrackIndex) >= _tracks.size())
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{
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_currentTrackIndex.reset();
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return;
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}
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if (createDecoder(*_currentTrackIndex))
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{
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startDecoder();
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_currentTrackPlaybackTimeOffset = _outputStream->getPlaybackTime() + _outputStream->getLatency();
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_currentTrackStartTimeOffset = {};
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}
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// TODO if failure, switch to the next song?
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}
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} // namespace lms::jukebox
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