223 lines
7.6 KiB
C++
223 lines
7.6 KiB
C++
/* This file is part of Clementine.
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Copyright 2014, David Sansome <me@davidsansome.com>
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Clementine 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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Clementine 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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You should have received a copy of the GNU General Public License
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along with Clementine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cddasongloader.h"
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#include <gst/gst.h>
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#include <gst/tag/tag.h>
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#include <QtConcurrentRun>
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#include "cddadevice.h"
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#include "core/logging.h"
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#include "core/timeconstants.h"
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CddaSongLoader::CddaSongLoader(const QUrl& url, QObject* parent)
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: QObject(parent), url_(url), cdda_(nullptr), may_load_(true) {
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connect(this, SIGNAL(MusicBrainzDiscIdLoaded(const QString&)),
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SLOT(LoadAudioCDTags(const QString&)));
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}
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CddaSongLoader::~CddaSongLoader() {
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// The LoadSongsFromCdda methods runs concurrently in a thread and we need to
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// wait for it to terminate. There's no guarantee that it has terminated when
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// destructor is invoked.
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may_load_ = false;
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loading_future_.waitForFinished();
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}
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QUrl CddaSongLoader::GetUrlFromTrack(int track_number) const {
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QString track;
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if (url_.isEmpty()) {
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track = QString("cdda://%1").arg(track_number);
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} else {
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track = QString("cdda://%1/%2").arg(url_.path()).arg(track_number);
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}
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return CddaDevice::TrackStrToUrl(track);
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}
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bool CddaSongLoader::IsActive() const { return loading_future_.isRunning(); }
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void CddaSongLoader::LoadSongs() {
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// only dispatch a new thread for loading tracks if not already running.
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if (!IsActive()) {
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loading_future_ =
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QtConcurrent::run(this, &CddaSongLoader::LoadSongsFromCdda);
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}
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}
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void CddaSongLoader::LoadSongsFromCdda() {
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if (!may_load_) return;
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// Create gstreamer cdda element
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GError* error = nullptr;
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cdda_ = gst_element_make_from_uri(GST_URI_SRC, "cdda://", nullptr, &error);
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if (error) {
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qLog(Error) << error->code << QString::fromLocal8Bit(error->message);
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}
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if (cdda_ == nullptr) {
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return;
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}
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if (!url_.isEmpty()) {
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g_object_set(cdda_, "device",
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g_strdup(url_.path().toLocal8Bit().constData()), nullptr);
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}
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if (g_object_class_find_property(G_OBJECT_GET_CLASS(cdda_),
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"paranoia-mode")) {
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g_object_set(cdda_, "paranoia-mode", 0, nullptr);
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}
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// Change the element's state to ready and paused, to be able to query it
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if (gst_element_set_state(cdda_, GST_STATE_READY) ==
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GST_STATE_CHANGE_FAILURE ||
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gst_element_set_state(cdda_, GST_STATE_PAUSED) ==
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GST_STATE_CHANGE_FAILURE) {
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gst_element_set_state(cdda_, GST_STATE_NULL);
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gst_object_unref(GST_OBJECT(cdda_));
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return;
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}
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// Get number of tracks
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GstFormat fmt = gst_format_get_by_nick("track");
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GstFormat out_fmt = fmt;
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gint64 num_tracks = 0;
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if (!gst_element_query_duration(cdda_, out_fmt, &num_tracks) ||
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out_fmt != fmt) {
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qLog(Error) << "Error while querying cdda GstElement";
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gst_object_unref(GST_OBJECT(cdda_));
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return;
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}
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SongList songs;
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for (int track_number = 1; track_number <= num_tracks; track_number++) {
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// Init song
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Song song;
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song.set_id(track_number);
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song.set_valid(true);
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song.set_filetype(Song::Type_Cdda);
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song.set_url(GetUrlFromTrack(track_number));
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song.set_title(QString("Track %1").arg(track_number));
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song.set_track(track_number);
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songs << song;
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}
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emit SongsLoaded(songs);
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gst_tag_register_musicbrainz_tags();
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GstElement* pipeline = gst_pipeline_new("pipeline");
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GstElement* sink = gst_element_factory_make("fakesink", NULL);
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gst_bin_add_many(GST_BIN(pipeline), cdda_, sink, nullptr);
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gst_element_link(cdda_, sink);
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gst_element_set_state(pipeline, GST_STATE_READY);
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gst_element_set_state(pipeline, GST_STATE_PAUSED);
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// Get TOC and TAG messages
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GstMessage* msg = nullptr;
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GstMessageType msg_filter =
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static_cast<GstMessageType>(GST_MESSAGE_TOC | GST_MESSAGE_TAG);
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QString musicbrainz_discid;
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while (may_load_ && msg_filter &&
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(msg = gst_bus_timed_pop_filtered(GST_ELEMENT_BUS(pipeline),
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10 * GST_SECOND, msg_filter))) {
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if (GST_MESSAGE_TYPE(msg) == GST_MESSAGE_TOC) {
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// Handle TOC message: get tracks duration
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GstToc* toc;
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gst_message_parse_toc(msg, &toc, nullptr);
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if (toc) {
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GList* entries = gst_toc_get_entries(toc);
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if (entries && songs.size() <= g_list_length(entries)) {
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int i = 0;
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for (GList* node = entries; node != nullptr; node = node->next) {
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GstTocEntry* entry = static_cast<GstTocEntry*>(node->data);
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quint64 duration = 0;
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gint64 start, stop;
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if (gst_toc_entry_get_start_stop_times(entry, &start, &stop))
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duration = stop - start;
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songs[i++].set_length_nanosec(duration);
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}
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emit SongsDurationLoaded(songs);
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msg_filter = static_cast<GstMessageType>(
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static_cast<int>(msg_filter) ^ GST_MESSAGE_TOC);
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}
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gst_toc_unref(toc);
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}
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} else if (GST_MESSAGE_TYPE(msg) == GST_MESSAGE_TAG) {
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// Handle TAG message: generate MusicBrainz DiscId
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GstTagList* tags = nullptr;
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gst_message_parse_tag(msg, &tags);
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char* string_mb = nullptr;
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if (gst_tag_list_get_string(tags, GST_TAG_CDDA_MUSICBRAINZ_DISCID,
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&string_mb)) {
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QString musicbrainz_discid = QString::fromUtf8(string_mb);
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g_free(string_mb);
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qLog(Info) << "MusicBrainz discid: " << musicbrainz_discid;
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emit MusicBrainzDiscIdLoaded(musicbrainz_discid);
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msg_filter = static_cast<GstMessageType>(static_cast<int>(msg_filter) ^
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GST_MESSAGE_TAG);
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}
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gst_tag_list_free(tags);
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}
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gst_message_unref(msg);
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}
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gst_element_set_state(pipeline, GST_STATE_NULL);
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// This will also cause cdda_ to be unref'd.
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gst_object_unref(pipeline);
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}
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void CddaSongLoader::LoadAudioCDTags(const QString& musicbrainz_discid) const {
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MusicBrainzClient* musicbrainz_client = new MusicBrainzClient;
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connect(musicbrainz_client,
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SIGNAL(Finished(const QString&, const QString&,
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MusicBrainzClient::ResultList)),
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SLOT(AudioCDTagsLoaded(const QString&, const QString&,
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MusicBrainzClient::ResultList)));
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musicbrainz_client->StartDiscIdRequest(musicbrainz_discid);
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}
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void CddaSongLoader::AudioCDTagsLoaded(
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const QString& artist, const QString& album,
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const MusicBrainzClient::ResultList& results) {
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MusicBrainzClient* musicbrainz_client =
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qobject_cast<MusicBrainzClient*>(sender());
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musicbrainz_client->deleteLater();
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SongList songs;
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if (results.empty()) return;
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int track_number = 1;
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for (const MusicBrainzClient::Result& ret : results) {
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Song song;
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song.set_artist(artist);
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song.set_album(album);
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song.set_title(ret.title_);
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song.set_length_nanosec(ret.duration_msec_ * kNsecPerMsec);
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song.set_track(track_number);
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song.set_year(ret.year_);
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song.set_id(track_number);
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song.set_filetype(Song::Type_Cdda);
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song.set_valid(true);
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// We need to set url: that's how playlist will find the correct item to
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// update
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song.set_url(GetUrlFromTrack(track_number++));
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songs << song;
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}
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emit SongsMetadataLoaded(songs);
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}
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