303 lines
9.9 KiB
PHP
303 lines
9.9 KiB
PHP
<?php
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declare(strict_types = 1);
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero 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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// GNU social 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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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/**
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* Animated GIF resize support via PHP-FFMpeg
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*
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* @package GNUsocial
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*
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* @author Bruno Casteleiro <up201505347@fc.up.pt>
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* @author Diogo Peralta Cordeiro <mail@diogo.site>
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* @copyright 2020-2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*
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* @see http://www.gnu.org/software/social/
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*/
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namespace Plugin\VideoEncoder;
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use App\Core\Event;
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use App\Core\GSFile;
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use function App\Core\I18n\_m;
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use App\Core\Log;
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use App\Core\Modules\Plugin;
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use App\Util\Exception\ServerException;
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use App\Util\Exception\TemporaryFileException;
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use App\Util\Formatting;
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use App\Util\TemporaryFile;
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use Exception;
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use FFMpeg\FFMpeg as ffmpeg;
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use FFMpeg\FFProbe as ffprobe;
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use SplFileInfo;
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class VideoEncoder extends Plugin
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{
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public function version(): string
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{
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return '1.0.0';
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}
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public static function shouldHandle(string $mimetype): bool
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{
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return GSFile::mimetypeMajor($mimetype) === 'video' || $mimetype === 'image/gif';
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}
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public function onFileMetaAvailable(array &$event_map, string $mimetype): bool
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{
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if (!self::shouldHandle($mimetype)) {
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return Event::next;
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}
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$event_map['video'][] = [$this, 'fileMeta'];
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$event_map['image/gif'][] = [$this, 'fileMeta'];
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return Event::next;
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}
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public function onFileSanitizerAvailable(array &$event_map, string $mimetype): bool
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{
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if ($mimetype !== 'image/gif') {
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return Event::next;
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}
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$event_map['video'][] = [$this, 'fileMeta'];
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$event_map['image/gif'][] = [$this, 'fileMeta'];
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return Event::next;
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}
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public function onFileResizerAvailable(array &$event_map, string $mimetype): bool
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{
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if ($mimetype !== 'image/gif') {
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return Event::next;
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}
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$event_map['video'][] = [$this, 'resizeVideoPath'];
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$event_map['image/gif'][] = [$this, 'resizeVideoPath'];
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return Event::next;
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}
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/**
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* Adds width and height metadata to gifs
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*
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* @param null|string $mimetype in/out
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* @param null|int $width out
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* @param null|int $height out
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*
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* @return bool true if metadata filled
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*/
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public function fileMeta(SplFileInfo &$file, ?string &$mimetype, ?int &$width, ?int &$height): bool
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{
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// Create FFProbe instance
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// Need to explicitly tell the drivers' location, or it won't find them
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$ffprobe = ffprobe::create([
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'ffmpeg.binaries' => exec('which ffmpeg'),
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'ffprobe.binaries' => exec('which ffprobe'),
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]);
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$metadata = $ffprobe->streams($file->getRealPath()) // extracts streams informations
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->videos() // filters video streams
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->first(); // returns the first video stream
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if (!\is_null($metadata)) {
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$width = $metadata->get('width');
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$height = $metadata->get('height');
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}
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return true;
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}
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/**
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* Resizes GIF files.
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*
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* @throws TemporaryFileException
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*/
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public function resizeVideoPath(string $source, ?TemporaryFile &$destination, int &$width, int &$height, bool $smart_crop, ?string &$mimetype): bool
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{
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switch ($mimetype) {
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case 'image/gif':
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// resize only if an animated GIF
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if ($this->isAnimatedGif($source)) {
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return $this->resizeImageFileAnimatedGif($source, $destination, $width, $height, $smart_crop, $mimetype);
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}
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break;
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}
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return false;
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}
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/**
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* Generates the view for attachments of type Video
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*/
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public function onViewAttachment(array $vars, array &$res): bool
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{
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if ($vars['attachment']->getMimetypeMajor() !== 'video') {
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return Event::next;
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}
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$res[] = Formatting::twigRenderFile(
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'videoEncoder/videoEncoderView.html.twig',
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[
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'attachment' => $vars['attachment'],
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'note' => $vars['note'],
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'title' => $vars['title'],
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],
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);
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return Event::stop;
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}
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/**
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* Animated GIF test, courtesy of frank at huddler dot com et al:
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* http://php.net/manual/en/function.imagecreatefromgif.php#104473
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* Modified so avoid landing inside of a header (and thus not matching our regexp).
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*/
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public function isAnimatedGif(string $filepath): bool
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{
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if (!($fh = @fopen($filepath, 'rb'))) {
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return false;
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}
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$count = 0;
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//an animated gif contains multiple "frames", with each frame having a
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//header made up of:
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// * a static 4-byte sequence (\x00\x21\xF9\x04)
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// * 4 variable bytes
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// * a static 2-byte sequence (\x00\x2C)
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// In total the header is maximum 10 bytes.
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// We read through the file til we reach the end of the file, or we've found
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// at least 2 frame headers
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while (!feof($fh) && $count < 2) {
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$chunk = fread($fh, 1024 * 100); //read 100kb at a time
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$count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
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// rewind in case we ended up in the middle of the header, but avoid
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// infinite loop (i.e. don't rewind if we're already in the end).
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if (!feof($fh) && ftell($fh) >= 9) {
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fseek($fh, -9, \SEEK_CUR);
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}
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}
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fclose($fh);
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return $count >= 1; // number of animated frames apart from the original image
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}
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/**
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* High quality GIF conversion.
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*
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* @see http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html
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* @see https://github.com/PHP-FFMpeg/PHP-FFMpeg/pull/592
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*
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* @throws TemporaryFileException
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*/
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public function resizeImageFileAnimatedGif(string $source, ?TemporaryFile &$destination, int &$width, int &$height, bool $smart_crop, ?string &$mimetype): bool
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{
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// Create FFMpeg instance
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// Need to explicitly tell the drivers' location, or it won't find them
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$ffmpeg = ffmpeg::create([
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'ffmpeg.binaries' => exec('which ffmpeg'),
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'ffprobe.binaries' => exec('which ffprobe'),
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]);
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// FFmpeg can't edit existing files in place,
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// generate temporary output file to avoid that
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$destination ??= new TemporaryFile(['prefix' => 'video']);
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// Generate palette file. FFmpeg explicitly needs to be told the
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// extension for PNG files outputs
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$palette = $this->tempnam_sfx(sys_get_temp_dir(), '.png');
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// Build filters
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$filters = 'fps=30';
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// if ($crop) {
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// $filters .= ",crop={$width}:{$height}:{$x}:{$y}";
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// }
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$filters .= ",scale={$width}:{$height}:flags=lanczos";
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// Assemble commands for palette generation
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$commands[] = $commands_2[] = '-f';
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$commands[] = $commands_2[] = 'gif';
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$commands[] = $commands_2[] = '-i';
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$commands[] = $commands_2[] = $source;
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$commands[] = '-vf';
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$commands[] = $filters . ',palettegen';
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$commands[] = '-y';
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$commands[] = $palette;
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// Assemble commands for GIF generation
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$commands_2[] = '-i';
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$commands_2[] = $palette;
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$commands_2[] = '-lavfi';
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$commands_2[] = $filters . ' [x]; [x][1:v] paletteuse';
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$commands_2[] = '-f';
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$commands_2[] = 'gif';
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$commands_2[] = '-y';
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$commands_2[] = $destination->getRealPath();
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$success = true;
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// Generate the palette image
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try {
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$ffmpeg->getFFMpegDriver()->command($commands);
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} catch (Exception $e) {
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Log::error('Unable to generate the palette image');
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$success = false;
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}
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// Generate GIF
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try {
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if ($success) {
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$ffmpeg->getFFMpegDriver()->command($commands_2);
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}
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} catch (Exception $e) {
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Log::error('Unable to generate the GIF image');
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$success = false;
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}
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@unlink($palette);
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$mimetype = 'image/gif';
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return $success;
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}
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/**
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* Suffix version of tempnam.
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* Courtesy of tomas at slax dot org:
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*
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* @see https://www.php.net/manual/en/function.tempnam.php#98232
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*/
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private function tempnam_sfx(string $dir, string $suffix): string
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{
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do {
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$file = $dir . '/' . mt_rand() . $suffix;
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$fp = @fopen($file, 'x');
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} while (!$fp);
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fclose($fp);
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return $file;
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}
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/**
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* @throws ServerException
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*/
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public function onPluginVersion(array &$versions): bool
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{
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$versions[] = ['name' => 'FFmpeg',
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'version' => self::version(),
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'author' => 'Bruno Casteleiro, Diogo Peralta Cordeiro',
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'homepage' => 'https://notabug.org/diogo/gnu-social/src/nightly/plugins/FFmpeg',
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'rawdescription', // TRANS: Plugin description. => _m('Use PHP-FFMpeg for some more video support.'),
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];
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return Event::next;
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}
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}
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