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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\InvalidArgumentException; |
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use Streaming\MediaInfo\Streams\Stream; |
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use Streaming\MediaInfo\Streams\StreamCollection; |
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class AutoRepresentations |
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{ |
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/** @var Stream $video */ |
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private $video; |
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/** @var Stream $general */ |
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private $general; |
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/** |
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* regular video's heights |
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* |
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* @var array side_values |
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*/ |
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private $side_values = [2160, 1080, 720, 480, 360, 240, 144]; |
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/** @var array $k_bitrate_values */ |
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private $k_bitrate_values; |
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/** |
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* AutoRepresentations constructor. |
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* @param StreamCollection $streamCollection |
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* @param null | array $side_values |
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* @param array $k_bitrate_values |
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*/ |
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public function __construct(StreamCollection $streamCollection, array $side_values = null, array $k_bitrate_values = null) |
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{ |
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$this->video = $streamCollection->videos()->first(); |
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$this->general = $streamCollection->general(); |
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$this->getSideValues($side_values); |
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$this->getKiloBitrateValues($k_bitrate_values); |
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} |
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/** |
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* @return array |
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*/ |
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private function getDimensions(): array |
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{ |
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$width = $this->video->get('Width'); |
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$height = $this->video->get('Height'); |
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return [$width, $height, $width / $height]; |
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} |
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/** |
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* @return mixed |
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* @throws InvalidArgumentException |
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*/ |
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private function getKiloBitRate(): int |
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{ |
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if (!$this->video->has('BitRate')) { |
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if (!$this->general->has('OverallBitRate')) { |
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throw new InvalidArgumentException("Invalid stream"); |
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} |
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return intval(($this->general->get('OverallBitRate') / 1024) * .9); |
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} |
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return (int)$this->video->get('BitRate') / 1024; |
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} |
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/** |
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* @return array |
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*/ |
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public function get(): array |
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{ |
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$k_bitrate = $this->getKiloBitRate(); |
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list($w, $h, $r) = $this->getDimensions(); |
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$reps[] = $this->addRep($k_bitrate, $w, $h); |
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foreach ($this->side_values as $key => $height) { |
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$reps[] = $this->addRep($this->k_bitrate_values[$key], Helper::roundToEven($r * $height), $height); |
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} |
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return array_reverse($reps); |
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} |
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/** |
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* @param $width |
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* @param $k_bitrate |
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* @param $height |
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* @return Representation |
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* @throws InvalidArgumentException |
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*/ |
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private function addRep($k_bitrate, $width, $height): Representation |
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{ |
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return (new Representation())->setKiloBitrate($k_bitrate)->setResize($width, $height); |
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} |
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/** |
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* @param array|null $k_bitrate_values |
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*/ |
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private function getKiloBitrateValues(?array $k_bitrate_values): void |
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{ |
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$count_sides = count($this->side_values); |
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if ($k_bitrate_values) { |
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if ($count_sides !== count($k_bitrate_values)) { |
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throw new InvalidArgumentException("The count of side value array must be the same as the count of kilo bitrate array"); |
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} |
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$this->k_bitrate_values = $k_bitrate_values; |
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return; |
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} |
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$k_bitrate_value = $this->getKiloBitRate(); |
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$divided_by = 1.5; |
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while ($count_sides) { |
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$this->k_bitrate_values[] = (($k_bitrate = intval($k_bitrate_value / $divided_by)) < 64) ? 64 : $k_bitrate; |
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$divided_by += .5; |
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$count_sides--; |
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} |
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} |
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/** |
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* @param array|null $side_values |
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*/ |
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private function getSideValues(?array $side_values): void |
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{ |
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if ($side_values) { |
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$this->side_values = $side_values; |
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return; |
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} |
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$h = $this->getDimensions()[1]; |
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$this->side_values = array_values(array_filter($this->side_values, function ($height) use ($h) { |
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return $height < $h; |
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})); |
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} |
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} |
aminyazdanpanah /
PHP-FFmpeg-video-streaming
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