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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 FFMpeg\Coordinate\Dimension; |
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use FFMpeg\Exception\ExceptionInterface; |
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use Streaming\Exception\InvalidArgumentException; |
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use Streaming\Exception\RuntimeException; |
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class AutoRepresentations |
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{ |
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/** @var \FFMpeg\FFProbe\DataMapping\Stream $video */ |
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private $video; |
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/** @var \FFMpeg\FFProbe\DataMapping\Format $format */ |
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private $format; |
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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 = [144, 240, 360, 480, 720, 1080, 1440, 2160]; |
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/** @var array $k_bitrate_values */ |
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private $k_bitrate; |
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/** |
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* AutoRepresentations constructor. |
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* @param Media $media |
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* @param array|null $sides |
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* @param array|null $k_bitrate |
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*/ |
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public function __construct(Media $media, array $sides = null, array $k_bitrate = null) |
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{ |
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$this->video = $media->getStreams()->videos()->first(); |
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$this->format = $media->getFormat(); |
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$this->getSideValues($sides); |
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$this->getKiloBitrateValues($k_bitrate); |
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} |
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/** |
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* @return Dimension |
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*/ |
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private function getDimensions(): Dimension |
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{ |
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try { |
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return $this->video->getDimensions(); |
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} catch (ExceptionInterface $e) { |
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throw new RuntimeException("Unable to extract dimensions.: " . $e->getMessage(), $e->getCode(), $e); |
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} |
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} |
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/** |
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* @return mixed |
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* @throws InvalidArgumentException |
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*/ |
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private function getKiloBitRate(): int |
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{ |
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if (!$this->video->has('bit_rate')) { |
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if (!$this->format->has('bit_rate')) { |
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throw new InvalidArgumentException("Unable to extract bitrate."); |
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} |
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return intval(($this->format->get('bit_rate') / 1024) * .9); |
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} |
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return (int)$this->video->get('bit_rate') / 1024; |
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} |
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/** |
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* @return array |
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*/ |
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public function get(): array |
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{ |
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$reps = []; |
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$dimension = $this->getDimensions(); |
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$ratio = $dimension->getRatio()->getValue(); |
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foreach ($this->side_values as $key => $height) { |
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array_push($reps, $this->addRep($this->k_bitrate[$key], Utiles::RTE($height * $ratio), $height)); |
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} |
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return array_merge($reps, [$this->addRep($this->getKiloBitRate(), $dimension->getWidth(), $dimension->getHeight())]); |
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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 $k_bitrate_values): void |
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{ |
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$k_bit_rates = []; |
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$count_sides = count($this->side_values); |
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if (!empty($k_bitrate_values)) { |
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if ($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 = $k_bitrate_values; |
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return; |
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} |
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$k_bitrate_value = $this->getKiloBitRate(); |
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$divided_by = 1.5; |
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while ($count_sides) { |
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$k_bit_rates[] = (($k_bitrate = intval($k_bitrate_value / $divided_by)) < 64) ? 64 : $k_bitrate; |
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$divided_by += .5; |
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$count_sides--; |
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} |
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$this->k_bitrate = array_reverse($k_bit_rates); |
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} |
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/** |
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* @param int $height |
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* @return bool |
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*/ |
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private function sideFilter(int $height): bool |
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{ |
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return $height < $this->getDimensions()->getHeight(); |
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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 $side_values): void |
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{ |
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if (!is_null($side_values)) { |
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$this->side_values = $side_values; |
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return; |
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} |
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$this->side_values = array_values(array_filter($this->side_values, [$this, 'sideFilter'])); |
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} |
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} |
aminyazdanpanah /
PHP-FFmpeg-video-streaming
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