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<?php |
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/** |
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* This file is part of the PHP-FFmpeg-video-streaming package. |
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* |
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* (c) Amin Yazdanpanah <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Streaming; |
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use Streaming\Exception\Exception; |
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use FFMpeg\FFProbe\DataMapping\Stream; |
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class AutoRepresentations |
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{ |
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/** @var Stream $stream */ |
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private $stream; |
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/** @Const regular video's heights */ |
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private const heights = [2160, 1080, 720, 480, 240, 144]; |
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/** |
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* AutoRepresentations constructor. |
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* @param Stream $stream |
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*/ |
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public function __construct(Stream $stream) |
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{ |
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$this->stream = $stream; |
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} |
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/** |
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* @return array |
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*/ |
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private function getDimensions(): array |
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{ |
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$width = $this->stream->get('width'); |
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$height = $this->stream->get('height'); |
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return [$width, $height, $width / $height]; |
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} |
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/** |
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* @return mixed |
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* @throws Exception |
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*/ |
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private function getKiloBitRate(): int |
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{ |
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if (!$this->stream->has('bit_rate')) { |
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throw new Exception("Invalid stream"); |
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} |
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return (int)$this->stream->get('bit_rate') / 1024; |
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} |
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/** |
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* @return array |
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* @throws Exception |
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*/ |
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public function get(): array |
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{ |
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$kilobitrate = $this->getKiloBitRate(); |
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list($width, $height, $ratio) = $this->getDimensions(); |
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$representations[] = $this->addRepresentation($kilobitrate, $width, $height); |
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$heights = array_filter(static::heights, function ($value) use ($height) { |
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return $value < $height; |
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}); |
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if (!empty($heights)) { |
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$kilobitrates = $this->getKiloBitRates($kilobitrate, count($heights)); |
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foreach (array_values($heights) as $key => $height) { |
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$representations[] = $this->addRepresentation($kilobitrates[$key], Helper::roundToEven($ratio * $height), $height); |
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} |
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} |
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return array_reverse($representations); |
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} |
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/** |
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* @param $width |
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* @param $kilobitrate |
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* @param $height |
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* @return Representation |
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* @throws Exception |
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*/ |
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private function addRepresentation($kilobitrate, $width, $height): Representation |
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{ |
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return (new Representation())->setKiloBitrate($kilobitrate)->setResize($width, $height); |
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} |
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/** |
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* @param $kilobitrate |
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* @param $count |
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* @return array |
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*/ |
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private function getKiloBitRates($kilobitrate, $count): array |
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{ |
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$divided_by = 1.3; |
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while ($count) { |
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$kilobitrates[] = (($kbitrate = intval($kilobitrate / $divided_by)) < 64) ? 64 : $kbitrate; |
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$divided_by += .3; |
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$count--; |
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} |
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return $kilobitrates; |
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} |
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} |
aminyazdanpanah /
PHP-FFmpeg-video-streaming
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