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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Preview;
use OCP\Files\File;
use OCP\Files\FileInfo;
use OCP\IConfig;
use OCP\IImage;
use OCP\ITempManager;
use OCP\Server;
use Psr\Log\LoggerInterface;
class Movie extends ProviderV2 {
private IConfig $config;
private ?string $binary = null;
public function __construct(array $options = []) {
parent::__construct($options);
$this->config = Server::get(IConfig::class);
}
public function getMimeType(): string {
return '/video\/.*/';
}
/**
* {@inheritDoc}
*/
public function isAvailable(FileInfo $file): bool {
if (is_null($this->binary)) {
if (isset($this->options['movieBinary'])) {
$this->binary = $this->options['movieBinary'];
}
}
return is_string($this->binary);
}
/**
* {@inheritDoc}
*/
public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
// TODO: use proc_open() and stream the source file ?
if (!$this->isAvailable($file)) {
return null;
}
$result = null;
if ($this->useTempFile($file)) {
// Try downloading 5 MB first, as it's likely that the first frames are present there.
// In some cases this doesn't work, for example when the moov atom is at the
// end of the file, so if it fails we fall back to getting the full file.
// Unless the file is not local (e.g. S3) as we do not want to download the whole (e.g. 37Gb) file
if ($file->getStorage()->isLocal()) {
$sizeAttempts = [5242880, null];
} else {
$sizeAttempts = [5242880];
}
} else {
// size is irrelevant, only attempt once
$sizeAttempts = [null];
}
foreach ($sizeAttempts as $size) {
$absPath = $this->getLocalFile($file, $size);
if ($absPath === false) {
Server::get(LoggerInterface::class)->error(
'Failed to get local file to generate thumbnail for: ' . $file->getPath(),
['app' => 'core']
);
return null;
}
$result = $this->generateThumbNail($maxX, $maxY, $absPath, 5);
if ($result === null) {
$result = $this->generateThumbNail($maxX, $maxY, $absPath, 1);
if ($result === null) {
$result = $this->generateThumbNail($maxX, $maxY, $absPath, 0);
}
}
$this->cleanTmpFiles();
if ($result !== null) {
break;
}
}
return $result;
}
private function useHdr(string $absPath): bool {
// load ffprobe path from configuration, otherwise generate binary path using ffmpeg binary path
$ffprobe_binary = $this->config->getSystemValue('preview_ffprobe_path', null) ?? (pathinfo($this->binary, PATHINFO_DIRNAME) . '/ffprobe');
// run ffprobe on the video file to get value of "color_transfer"
$test_hdr_cmd = [$ffprobe_binary,'-select_streams', 'v:0',
'-show_entries', 'stream=color_transfer',
'-of', 'default=noprint_wrappers=1:nokey=1',
$absPath];
$test_hdr_proc = proc_open($test_hdr_cmd, [1 => ['pipe', 'w'], 2 => ['pipe', 'w']], $test_hdr_pipes);
if ($test_hdr_proc === false) {
return false;
}
$test_hdr_stdout = trim(stream_get_contents($test_hdr_pipes[1]));
$test_hdr_stderr = trim(stream_get_contents($test_hdr_pipes[2]));
proc_close($test_hdr_proc);
// search build options for libzimg (provides zscale filter)
$ffmpeg_libzimg_installed = strpos($test_hdr_stderr, '--enable-libzimg');
// Only values of "smpte2084" and "arib-std-b67" indicate an HDR video.
// Only return true if video is detected as HDR and libzimg is installed.
if (($test_hdr_stdout === 'smpte2084' || $test_hdr_stdout === 'arib-std-b67') && $ffmpeg_libzimg_installed !== false) {
return true;
} else {
return false;
}
}
private function generateThumbNail(int $maxX, int $maxY, string $absPath, int $second): ?IImage {
$tmpPath = Server::get(ITempManager::class)->getTemporaryFile();
if ($tmpPath === false) {
Server::get(LoggerInterface::class)->error(
'Failed to get local file to generate thumbnail for: ' . $absPath,
['app' => 'core']
);
return null;
}
$binaryType = substr(strrchr($this->binary, '/'), 1);
if ($binaryType === 'avconv') {
$cmd = [$this->binary, '-y', '-ss', (string)$second,
'-i', $absPath,
'-an', '-f', 'mjpeg', '-vframes', '1', '-vsync', '1',
$tmpPath];
} elseif ($binaryType === 'ffmpeg') {
if ($this->useHdr($absPath)) {
// Force colorspace to '2020_ncl' because some videos are
// tagged incorrectly as 'reserved' resulting in fail if not forced.
$cmd = [$this->binary, '-y', '-ss', (string)$second,
'-i', $absPath,
'-f', 'mjpeg', '-vframes', '1',
'-vf', 'zscale=min=2020_ncl:t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0,zscale=t=bt709:m=bt709:r=tv,format=yuv420p',
$tmpPath];
} else {
// always default to generating preview using non-HDR command
$cmd = [$this->binary, '-y', '-ss', (string)$second,
'-i', $absPath,
'-f', 'mjpeg', '-vframes', '1',
$tmpPath];
}
} else {
// Not supported
unlink($tmpPath);
return null;
}
$proc = proc_open($cmd, [1 => ['pipe', 'w'], 2 => ['pipe', 'w']], $pipes);
$returnCode = -1;
$output = '';
if (is_resource($proc)) {
$stdout = trim(stream_get_contents($pipes[1]));
$stderr = trim(stream_get_contents($pipes[2]));
$returnCode = proc_close($proc);
$output = $stdout . $stderr;
}
if ($returnCode === 0) {
$image = new \OCP\Image();
$image->loadFromFile($tmpPath);
if ($image->valid()) {
unlink($tmpPath);
$image->scaleDownToFit($maxX, $maxY);
return $image;
}
}
if ($second === 0) {
$logger = Server::get(LoggerInterface::class);
$logger->info('Movie preview generation failed Output: {output}', ['app' => 'core', 'output' => $output]);
}
unlink($tmpPath);
return null;
}
}
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