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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * This file is part of Bino, a 3D video player. | ||
| * | ||
| * Copyright (C) 2024 | ||
| * Martin Lambers <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
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| #include <QDir> | ||
| #include <QTemporaryFile> | ||
| #include <QSharedPointer> | ||
| #include <QImage> | ||
| #include <cstring> | ||
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| #include "urlloader.hpp" | ||
| #include "log.hpp" | ||
| #include "digestiblemedia.hpp" | ||
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| /* We convert JPEGs to temporary PPMs here, for the following reasons: | ||
| * - QtMultimedia tries to decode JPEGs with hardware acceleration, which fails | ||
| * when the image dimensions (or other properties) are not within the | ||
| * constraints of the hardware decoder, which is optimized for video. | ||
| * This happens often with both the GStreamer and FFmpeg backends. | ||
| * Unfortunately there does not seem to be a fallback to software decoding. | ||
| * - MPO files can contain multiple JPEG images. In the only relevant use case, | ||
| * they contain a left and a right JPEG with a lot of junk in between (probably | ||
| * called metadata by some standard). These files typically cannot be read | ||
| * reliably by either QtMultimedia backend. So we read both JPEGs manually | ||
| * from the MPO and stack them on top of each other (top-bottom format). | ||
| * - The destination image format is PPM because it is fast to write (no | ||
| * compression) and the media backend will not be tempted to try hardware | ||
| * accelerated decoding on PPMs. | ||
| */ | ||
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| QUrl digestibleMediaUrl(const QUrl& url) | ||
| { | ||
| static QMap<QUrl, QSharedPointer<QTemporaryFile>> cache; | ||
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| // check if we need conversion | ||
| bool needsConversion = url.fileName().endsWith(".jpg", Qt::CaseInsensitive) | ||
| || url.fileName().endsWith(".jpeg", Qt::CaseInsensitive) | ||
| || url.fileName().endsWith(".jps", Qt::CaseInsensitive) | ||
| || url.fileName().endsWith(".mpo", Qt::CaseInsensitive); | ||
| if (!needsConversion) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1 needs no conversion").arg(url.toString()))); | ||
| return url; | ||
| } | ||
|
|
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| // check if we have it cached | ||
| QSharedPointer<QTemporaryFile> tempFile = nullptr; | ||
| auto it = cache.find(url); | ||
| if (it != cache.end()) { | ||
| tempFile = it.value(); | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1 is in cache: %2").arg(url.toString()).arg(tempFile->fileName()))); | ||
| } | ||
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| // build temporary file if it is not in cache yet | ||
| if (!tempFile) { | ||
| UrlLoader loader(url); | ||
| const QByteArray& data = loader.load(); | ||
| if (data.size() == 0) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1: cannot download").arg(url.toString()))); | ||
| return url; | ||
| } | ||
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| QImage img; | ||
| if (!img.loadFromData(data, "JPG")) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1: cannot load JPEG").arg(url.toString()))); | ||
| return url; | ||
| } | ||
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| if (url.fileName().endsWith("mpo", Qt::CaseInsensitive)) { | ||
| unsigned char jpegMarker[4] = { 0xff, 0xd8, 0xff, 0xe1 }; | ||
| QByteArrayView jpegMarkerView(jpegMarker, 4); | ||
| qsizetype nextJpeg = data.indexOf(jpegMarkerView, 4); | ||
| if (nextJpeg <= 0) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1: no second jpeg marker found").arg(url.toString()))); | ||
| } else { | ||
| QImage imgRight; | ||
| if (!imgRight.loadFromData(QByteArrayView(data.data() + nextJpeg, data.size() - nextJpeg), "JPG")) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1: cannot load second jpeg").arg(url.toString()))); | ||
| } else { | ||
| if (img.format() != imgRight.format() || img.size() != imgRight.size()) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1: second jpeg is incompatible").arg(url.toString()))); | ||
| } else { | ||
| QImage combinedImg(img.width(), 2 * img.height(), img.format()); | ||
| for (int i = 0; i < img.height(); i++) { | ||
| std::memcpy(combinedImg.scanLine(i), img.constScanLine(i), img.bytesPerLine()); | ||
| } | ||
| for (int i = 0; i < img.height(); i++) { | ||
| std::memcpy(combinedImg.scanLine(img.height() + i), imgRight.constScanLine(i), imgRight.bytesPerLine()); | ||
| } | ||
| img = combinedImg; | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| QString tmpl = QDir::tempPath() + '/' + QString("bino-XXXXXX") + QString(".ppm"); | ||
| tempFile.reset(new QTemporaryFile(tmpl)); | ||
| if (!img.save(tempFile.get(), "PPM")) { | ||
| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1: cannot save to %2").arg(url.toString()).arg(tempFile->fileName()))); | ||
| return url; | ||
| } | ||
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| LOG_DEBUG("%s", qPrintable(QString("digestibleMediaUrl: %1 is saved in %2").arg(url.toString()).arg(tempFile->fileName()))); | ||
| cache.insert(url, tempFile); | ||
| } | ||
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| return QUrl::fromLocalFile(tempFile->fileName()); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| /* | ||
| * This file is part of Bino, a 3D video player. | ||
| * | ||
| * Copyright (C) 2024 | ||
| * Martin Lambers <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
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| #pragma once | ||
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| #include <QUrl> | ||
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| QUrl digestibleMediaUrl(const QUrl& url); |
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