v1.2

bug fixes #34

Author: aminyazdanpanah

src/AutoRepresentations.php

@@ -0,0 +1,236 @@
+<?php
+
+/**
+ * This file is part of the PHP-FFmpeg-video-streaming package.
+ *
+ * (c) Amin Yazdanpanah <contact@aminyazdanpanah.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Streaming;
+
+use FFMpeg\Coordinate\Dimension;
+use FFMpeg\Exception\ExceptionInterface;
+use Streaming\Exception\InvalidArgumentException;
+use Streaming\Exception\RuntimeException;
+use Streaming\Format\VideoInterface;
+
+
+class AutoReps implements \IteratorAggregate
+{
+    /** @var \FFMpeg\FFProbe\DataMapping\Stream $video */
+    private $video;
+
+    /** @var \FFMpeg\FFProbe\DataMapping\Format $format */
+    private $original_format;
+
+    /**
+     * regular video's heights
+     *
+     * @var array side_values
+     */
+    private $sides = [144, 240, 360, 480, 720, 1080, 1440, 2160];
+
+    /** @var array $k_bitrate */
+    private $k_bitrate;
+
+    /** @var string */
+    private $sort = "asc";
+
+    /** @const VideoInterface */
+    private $format;
+
+    /**
+     * AutoReps constructor.
+     * @param Media $media
+     * @param VideoInterface $format
+     * @param array|null $sides
+     * @param array|null $k_bitrate
+     */
+    public function __construct(Media $media, VideoInterface $format, array $sides = null, array $k_bitrate = null)
+    {
+        $this->format = $format;
+        $this->video = $media->getStreams()->videos()->first();
+        $this->original_format = $media->getFormat();
+        $this->sides($sides, $k_bitrate);
+        $this->kiloBitrate($k_bitrate);
+    }
+
+    /**
+     * Set sort order for reps
+     * @param string $sort
+     */
+    public function sort(string $sort)
+    {
+        $this->sort = $sort;
+    }
+
+    /**
+     * @return Dimension
+     */
+    private function getDimensions(): Dimension
+    {
+        try {
+            return $this->video->getDimensions();
+        } catch (ExceptionInterface $e) {
+            throw new RuntimeException("Unable to extract dimensions.: " . $e->getMessage(), $e->getCode(), $e);
+        }
+    }
+
+    /**
+     * @return mixed
+     * @throws InvalidArgumentException
+     */
+    private function getKiloBitRate(): int
+    {
+        if (!$this->video->has('bit_rate')) {
+            if (!$this->original_format->has('bit_rate')) {
+                throw new InvalidArgumentException("Unable to extract bitrate.");
+            }
+
+            return intval(($this->original_format->get('bit_rate') / 1024) * .9);
+        }
+
+        return (int)$this->video->get('bit_rate') / 1024;
+    }
+
+    /**
+     * @param array|null $k_bitrate_values
+     */
+    private function kiloBitrate(?array $k_bitrate_values): void
+    {
+        $k_bit_rates = [];
+        $count_sides = count($this->sides);
+
+        if (!is_null($k_bitrate_values)) {
+            if ($count_sides !== count($k_bitrate_values)) {
+                throw new InvalidArgumentException("The count of side value array must be the same as the count of kilo bitrate array");
+            }
+            $this->k_bitrate = $k_bitrate_values;
+            return;
+        }
+
+        $k_bitrate_value = $this->getKiloBitRate();
+        $divided_by = 1.5;
+
+        while ($count_sides) {
+            $k_bit_rates[] = (($k_bitrate = intval($k_bitrate_value / $divided_by)) < 64) ? 64 : $k_bitrate;
+            $divided_by += .5;
+            $count_sides--;
+        }
+
+        $this->k_bitrate = array_reverse($k_bit_rates);
+    }
+
+    /**
+     * @param int $height
+     * @return bool
+     */
+    private function sideFilter(int $height): bool
+    {
+        return $height < $this->getDimensions()->getHeight();
+    }
+
+    /**
+     * @param array|null $sides
+     * @param array|null $k_bitrate
+     */
+    private function sides(?array $sides, ?array $k_bitrate): void
+    {
+        if (!is_null($sides) && is_null($k_bitrate)) {
+            sort($sides);
+        }
+
+        $this->sides = array_values(array_filter($sides ?? $this->sides, [$this, 'sideFilter']));
+    }
+
+    /**
+     * @param int $height
+     * @return int
+     */
+    private function computeWidth(int $height): int
+    {
+        return $this->getDimensions()->getRatio()->calculateWidth($height, $this->format->getModulus());
+    }
+
+    /**
+     * @param $width
+     * @param $k_bitrate
+     * @param $height
+     * @return Representation
+     * @throws InvalidArgumentException
+     */
+    private function addRep($k_bitrate, $width, $height): Representation
+    {
+        return (new Representation)->setKiloBitrate($k_bitrate)->setResize($width, $height);
+    }
+
+    /**
+     * @param array $reps
+     */
+    private function sortReps(array &$reps): void
+    {
+        usort($reps, function (Representation $rep1, Representation $rep2) {
+            $ascending = $rep1->getKiloBitrate() > $rep2->getKiloBitrate();
+            return $this->sort === "asc" ? $ascending : !$ascending;
+        });
+    }
+
+    /**
+     * @param bool $sort
+     * @return array
+     */
+    public function getCalculatedReps(bool $sort = false): array
+    {
+        $reps = [];
+        foreach ($this->sides as $key => $height) {
+            array_push($reps, $this->addRep($this->k_bitrate[$key], $this->computeWidth($height), $height));
+        }
+
+        if ($sort) {
+            $this->sortReps($reps);
+        }
+
+        return $reps;
+    }
+
+    /**
+     * @return Representation
+     */
+    public function getOriginalRep(): Representation
+    {
+        $dimension = $this->getDimensions();
+        return $this->addRep($this->getKiloBitRate(), $dimension->getWidth(), $dimension->getHeight());
+    }
+
+    /**
+     * @return array
+     */
+    public function getSides(): array
+    {
+        return $this->sides;
+    }
+
+    /**
+     * @return array
+     */
+    public function getKBitrate(): array
+    {
+        return $this->k_bitrate;
+    }
+
+    /**
+     * Retrieve an external iterator reps
+     * @return \Traversable An instance of an object implementing <b>Iterator</b> or <b>Traversable</b>
+     */
+    public function getIterator()
+    {
+        $reps = $this->getCalculatedReps();
+        array_push($reps, $this->getOriginalRep());
+        $this->sortReps($reps);
+
+        return new \ArrayIterator($reps);
+    }
+}