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<?php
class Af_Z_Video_Fill_Poster extends Plugin {
/* @var PluginHost $host */
private $host;
/* @var DiskCache $cache */
private $cache;
function about() {
return array(1.0,
"Fills missing poster attributes of HTML5 video elements (uses ffmpeg)",
"fox");
}
function init($host) {
$this->host = $host;
$this->cache = new DiskCache("images");
$host->add_hook($host::HOOK_ARTICLE_FILTER, $this);
}
private function ffmpeg_thumbnail($input_filename, $output_filename) {
$cmdline_tpl = "ffmpeg -ss 00:00:01 -i %s -frames:v 1 ".
"-f singlejpeg %s 2>/dev/null";
$rc = -1;
$cmdline = sprintf($cmdline_tpl, escapeshellarg($input_filename), escapeshellarg($output_filename));
exec($cmdline, $output, $rc);;
return $rc === 0;
}
function hook_article_filter($article) {
$need_saving = false;
$doc = new DOMDocument();
if (@$doc->loadHTML('<?xml encoding="UTF-8">' . $article["content"])) {
$xpath = new DOMXPath($doc);
$videos = $xpath->query('(//video)');
foreach ($videos as $video) {
if (!$video->hasAttribute("poster")) {
$source = $xpath->query("//source[@src]", $video)->item(0);
if ($source) {
$video_url = $source->getAttribute("src");
$local_filename = sha1($video_url);
$thumb_filename = $local_filename . "-POSTER";
if ($this->cache->exists($thumb_filename)) {
$video->setAttribute("poster", $this->cache->getUrl($thumb_filename));
$need_saving = true;
} else {
if ($this->cache->exists($local_filename)) {
if ($this->ffmpeg_thumbnail(
$this->cache->getFullPath($local_filename),
$this->cache->getFullPath($thumb_filename))) {
$video->setAttribute("poster", $this->cache->getUrl($thumb_filename));
$need_saving = true;
}
} else {
$data = fetch_file_contents(["url" => $video_url, "max_size" => MAX_CACHE_FILE_SIZE]);
if ($data) {
if ($this->cache->put($local_filename, $data)) {
if ($this->ffmpeg_thumbnail(
$this->cache->getFullPath($local_filename),
$this->cache->getFullPath($thumb_filename))) {
$video->setAttribute("poster", $this->cache->getUrl($thumb_filename));
$need_saving = true;
}
}
}
}
}
}
}
}
if ($need_saving)
$article["content"] = $doc->saveHTML();
}
return $article;
}
function api_version() {
return 2;
}
}
|
