From fa372585022479df59577d978a11f8541b8e305b Mon Sep 17 00:00:00 2001
From: Jon Hassall <jon@jonhassall.com>
Date: Sat, 20 Oct 2018 14:36:10 +0100
Subject: [PATCH] Added custom filters for Audio, in the same way as custom
 filters are available for Video

---
 src/FFMpeg/Filters/Audio/AudioFilters.php     | 14 +++++
 src/FFMpeg/Filters/Audio/CustomFilter.php     | 52 +++++++++++++++++++
 tests/Unit/Filters/Audio/CustomFilterTest.php | 20 +++++++
 3 files changed, 86 insertions(+)
 create mode 100644 src/FFMpeg/Filters/Audio/CustomFilter.php
 create mode 100644 tests/Unit/Filters/Audio/CustomFilterTest.php

diff --git a/src/FFMpeg/Filters/Audio/AudioFilters.php b/src/FFMpeg/Filters/Audio/AudioFilters.php
index 5e26990..41308c0 100644
--- a/src/FFMpeg/Filters/Audio/AudioFilters.php
+++ b/src/FFMpeg/Filters/Audio/AudioFilters.php
@@ -71,4 +71,18 @@ class AudioFilters
 
         return $this;
     }
+
+    /**
+     * Applies a custom filter
+     *
+     * @param string    $parameters
+     *
+     * @return AudioFilters
+     */
+    public function custom($parameters)
+    {
+        $this->media->addFilter(new CustomFilter($parameters));
+
+        return $this;
+    }
 }
diff --git a/src/FFMpeg/Filters/Audio/CustomFilter.php b/src/FFMpeg/Filters/Audio/CustomFilter.php
new file mode 100644
index 0000000..4c1a29c
--- /dev/null
+++ b/src/FFMpeg/Filters/Audio/CustomFilter.php
@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * This file is part of PHP-FFmpeg.
+ *
+ * (c) Alchemy <dev.team@alchemy.fr>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace FFMpeg\Filters\Audio;
+
+use FFMpeg\Format\AudioInterface;
+use FFMpeg\Media\Audio;
+
+class CustomFilter implements AudioFilterInterface
+{
+    /** @var string */
+    private $filter;
+    /** @var integer */
+    private $priority;
+
+    /**
+     * A custom filter, useful if you want to build complex filters
+     *
+     * @param string $filter
+     * @param int    $priority
+     */
+    public function __construct($filter, $priority = 0)
+    {
+        $this->filter = $filter;
+        $this->priority = $priority;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return $this->priority;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply(Audio $audio, AudioInterface $format)
+    {
+        $commands = array('-af', $this->filter);
+
+        return $commands;
+    }
+}
diff --git a/tests/Unit/Filters/Audio/CustomFilterTest.php b/tests/Unit/Filters/Audio/CustomFilterTest.php
new file mode 100644
index 0000000..9c527e2
--- /dev/null
+++ b/tests/Unit/Filters/Audio/CustomFilterTest.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Filters\Audio;
+
+use FFMpeg\Filters\Audio\CustomFilter;
+use FFMpeg\Filters\Audio\FrameRateFilter;
+use Tests\FFMpeg\Unit\TestCase;
+use FFMpeg\Coordinate\FrameRate;
+
+class CustomFilterTest extends TestCase
+{
+    public function testApplyCustomFilter()
+    {
+        $audio = $this->getAudioMock();
+        $format = $this->getMock('FFMpeg\Format\AudioInterface');
+
+        $filter = new CustomFilter('whatever i put would end up as a filter');
+        $this->assertEquals(array('-af', 'whatever i put would end up as a filter'), $filter->apply($audio, $format));
+    }
+}