285 lines
8.0 KiB
C++
285 lines
8.0 KiB
C++
/*
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* Strawberry Music Player
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* This file was part of Clementine.
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* Copyright 2010, David Sansome <me@davidsansome.com>
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*
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* Strawberry 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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* Strawberry 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 Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "config.h"
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#include <algorithm>
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#include <cmath>
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#include <QObject>
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#include <QtAlgorithms>
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#include <QTimer>
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#include <QList>
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#include <QString>
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#include <QUrl>
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#include <QImage>
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#include <QNetworkAccessManager>
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#include <QNetworkRequest>
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#include <QNetworkReply>
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#include <QtDebug>
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#include "core/closure.h"
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#include "core/logging.h"
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#include "core/network.h"
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#include "albumcoverfetcher.h"
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#include "albumcoverfetchersearch.h"
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#include "coverprovider.h"
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#include "coverproviders.h"
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const int AlbumCoverFetcherSearch::kSearchTimeoutMs = 12000;
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const int AlbumCoverFetcherSearch::kImageLoadTimeoutMs = 3000;
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const int AlbumCoverFetcherSearch::kTargetSize = 500;
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const float AlbumCoverFetcherSearch::kGoodScore = 1.85;
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AlbumCoverFetcherSearch::AlbumCoverFetcherSearch(
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const CoverSearchRequest &request, QNetworkAccessManager *network, QObject *parent)
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: QObject(parent),
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request_(request),
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image_load_timeout_(new NetworkTimeouts(kImageLoadTimeoutMs, this)),
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network_(network),
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cancel_requested_(false) {
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// We will terminate the search after kSearchTimeoutMs miliseconds if we are not able to find all of the results before that point in time
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QTimer::singleShot(kSearchTimeoutMs, this, SLOT(TerminateSearch()));
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}
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void AlbumCoverFetcherSearch::TerminateSearch() {
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for (int id : pending_requests_.keys()) {
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pending_requests_.take(id)->CancelSearch(id);
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}
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AllProvidersFinished();
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}
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void AlbumCoverFetcherSearch::Start(CoverProviders *cover_providers) {
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for (CoverProvider *provider : cover_providers->List()) {
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// Skip provider if it does not have fetchall set, and we are doing fetchall - "Fetch Missing Covers".
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if (!provider->fetchall() && request_.fetchall) {
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//qLog(Debug) << "Skipping provider" << provider->name();
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continue;
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}
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connect(provider, SIGNAL(SearchFinished(int, QList<CoverSearchResult>)), SLOT(ProviderSearchFinished(int, QList<CoverSearchResult>)));
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const int id = cover_providers->NextId();
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const bool success = provider->StartSearch(request_.artist, request_.album, id);
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if (success) {
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pending_requests_[id] = provider;
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statistics_.network_requests_made_++;
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}
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}
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// End this search before it even began if there are no providers...
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if (pending_requests_.isEmpty()) {
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TerminateSearch();
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}
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}
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static bool CompareProviders(const CoverSearchResult &a, const CoverSearchResult &b) {
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return a.provider < b.provider;
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}
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void AlbumCoverFetcherSearch::ProviderSearchFinished(int id, const QList<CoverSearchResult> &results) {
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if (!pending_requests_.contains(id)) return;
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CoverProvider *provider = pending_requests_.take(id);
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CoverSearchResults results_copy(results);
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// Set categories on the results
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for (int i = 0; i < results_copy.count(); ++i) {
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results_copy[i].provider = provider->name();
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}
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// Add results from the current provider to our pool
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results_.append(results_copy);
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statistics_.total_images_by_provider_[provider->name()]++;
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// Do we have more providers left?
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if (!pending_requests_.isEmpty()) {
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return;
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}
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AllProvidersFinished();
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}
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void AlbumCoverFetcherSearch::AllProvidersFinished() {
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if (cancel_requested_) {
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return;
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}
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// If we only wanted to do the search then we're done
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if (request_.search) {
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emit SearchFinished(request_.id, results_);
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return;
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}
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// No results?
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if (results_.isEmpty()) {
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statistics_.missing_images_++;
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emit AlbumCoverFetched(request_.id, QImage());
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return;
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}
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// Now we have to load some images and figure out which one is the best.
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// We'll sort the list of results by category, then load the first few images from each category and use some heuristics to score them.
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// If no images are good enough we'll keep loading more images until we find one that is or we run out of results.
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qStableSort(results_.begin(), results_.end(), CompareProviders);
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FetchMoreImages();
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}
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void AlbumCoverFetcherSearch::FetchMoreImages() {
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// Try the first one in each category.
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QString last_provider;
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for (int i = 0; i < results_.count(); ++i) {
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if (results_[i].provider == last_provider) {
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continue;
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}
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CoverSearchResult result = results_.takeAt(i--);
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last_provider = result.provider;
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qLog(Debug) << "Loading" << result.image_url << "from" << result.provider;
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RedirectFollower *image_reply = new RedirectFollower(network_->get(QNetworkRequest(result.image_url)));
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NewClosure(image_reply, SIGNAL(finished()), this, SLOT(ProviderCoverFetchFinished(RedirectFollower*)), image_reply);
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pending_image_loads_[image_reply] = result.provider;
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image_load_timeout_->AddReply(image_reply);
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statistics_.network_requests_made_++;
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}
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if (pending_image_loads_.isEmpty()) {
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// There were no more results? Time to give up.
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SendBestImage();
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}
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}
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void AlbumCoverFetcherSearch::ProviderCoverFetchFinished(RedirectFollower *reply) {
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reply->deleteLater();
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const QString provider = pending_image_loads_.take(reply);
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statistics_.bytes_transferred_ += reply->bytesAvailable();
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if (cancel_requested_) {
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return;
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}
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if (reply->error() != QNetworkReply::NoError) {
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qLog(Info) << "Error requesting" << reply->url() << reply->errorString();
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}
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else {
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QImage image;
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if (!image.loadFromData(reply->readAll())) {
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qLog(Info) << "Error decoding image data from" << reply->url();
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}
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else {
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const float score = ScoreImage(image);
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candidate_images_.insertMulti(score, CandidateImage(provider, image));
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qLog(Debug) << reply->url() << "scored" << score;
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}
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}
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if (pending_image_loads_.isEmpty()) {
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// We've fetched everything we wanted to fetch for now, check if we have an image that's good enough.
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float best_score = 0.0;
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if (!candidate_images_.isEmpty()) {
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best_score = candidate_images_.keys().last();
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}
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qLog(Debug) << "Best image so far has a score of" << best_score;
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if (best_score >= kGoodScore) {
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SendBestImage();
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}
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else {
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FetchMoreImages();
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}
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}
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}
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float AlbumCoverFetcherSearch::ScoreImage(const QImage &image) const {
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// Invalid images score nothing
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if (image.isNull()) {
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return 0.0;
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}
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// A 500x500px image scores 1.0, bigger scores higher
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const float size_score = std::sqrt(float(image.width() * image.height())) / kTargetSize;
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// A 1:1 image scores 1.0, anything else scores less
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const float aspect_score = 1.0 - float(image.height() - image.width()) / std::max(image.height(), image.width());
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return size_score + aspect_score;
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}
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void AlbumCoverFetcherSearch::SendBestImage() {
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QImage image;
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if (!candidate_images_.isEmpty()) {
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const CandidateImage best_image = candidate_images_.values().back();
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image = best_image.second;
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statistics_.chosen_images_by_provider_[best_image.first]++;
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statistics_.chosen_images_++;
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statistics_.chosen_width_ += image.width();
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statistics_.chosen_height_ += image.height();
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}
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else {
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statistics_.missing_images_++;
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}
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emit AlbumCoverFetched(request_.id, image);
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}
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void AlbumCoverFetcherSearch::Cancel() {
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cancel_requested_ = true;
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if (!pending_requests_.isEmpty()) {
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TerminateSearch();
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}
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else if (!pending_image_loads_.isEmpty()) {
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for (RedirectFollower *reply : pending_image_loads_.keys()) {
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reply->abort();
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}
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pending_image_loads_.clear();
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}
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}
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