Add DisplayRatioFixer Frame filter

tests/FFMpeg/Tests/Filters/Frame/DisplayRatioFixerFilterTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace FFMpeg\Tests\Filters\Frame;
+
+use FFMpeg\Tests\TestCase;
+use FFMpeg\Filters\Frame\DisplayRatioFixerFilter;
+use FFMpeg\Media\Frame;
+use FFMpeg\Coordinate\TimeCode;
+use FFMpeg\FFProbe\DataMapping\StreamCollection;
+use FFMpeg\FFProbe\DataMapping\Stream;
+
+class DisplayRatioFixerFilterTest extends TestCase
+{
+    public function testApply()
+    {
+        $stream = new Stream(array('codec_type' => 'video', 'width' => 960, 'height' => 720));
+        $streams = new StreamCollection(array($stream));
+        
+        $video = $this->getVideoMock(__FILE__);
+        $video->expects($this->once())
+                ->method('getStreams')
+                ->will($this->returnValue($streams));
+        
+        $frame = new Frame($video, $this->getFFMpegDriverMock(), $this->getFFProbeMock(), new TimeCode(0, 0, 0, 0));
+        $filter = new DisplayRatioFixerFilter();
+        $this->assertEquals(array('-s', '960x720'), $filter->apply($frame));
+    }
+}