class FileVideoFormatter

class FileVideoFormatter extends FileMediaFormatterBase {
    
    /**
     * {@inheritdoc}
     */
    public static function getMediaType() {
        return 'video';
    }
    
    /**
     * {@inheritdoc}
     */
    public static function defaultSettings() {
        return [
            'muted' => FALSE,
            'width' => 640,
            'height' => 480,
        ] + parent::defaultSettings();
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsForm(array $form, FormStateInterface $form_state) {
        return parent::settingsForm($form, $form_state) + [
            'muted' => [
                '#title' => $this->t('Muted'),
                '#type' => 'checkbox',
                '#default_value' => $this->getSetting('muted'),
            ],
            'width' => [
                '#type' => 'number',
                '#title' => $this->t('Width'),
                '#default_value' => $this->getSetting('width'),
                '#size' => 5,
                '#maxlength' => 5,
                '#field_suffix' => $this->t('pixels'),
                // A width of zero pixels would make this video invisible.
'#min' => 1,
            ],
            'height' => [
                '#type' => 'number',
                '#title' => $this->t('Height'),
                '#default_value' => $this->getSetting('height'),
                '#size' => 5,
                '#maxlength' => 5,
                '#field_suffix' => $this->t('pixels'),
                // A height of zero pixels would make this video invisible.
'#min' => 1,
            ],
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsSummary() {
        $summary = parent::settingsSummary();
        $summary[] = $this->t('Muted: %muted', [
            '%muted' => $this->getSetting('muted') ? $this->t('yes') : $this->t('no'),
        ]);
        if ($width = $this->getSetting('width')) {
            $summary[] = $this->t('Width: %width pixels', [
                '%width' => $width,
            ]);
        }
        if ($height = $this->getSetting('height')) {
            $summary[] = $this->t('Height: %height pixels', [
                '%height' => $height,
            ]);
        }
        return $summary;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function prepareAttributes(array $additional_attributes = []) {
        $attributes = parent::prepareAttributes([
            'muted',
        ]);
        if ($width = $this->getSetting('width')) {
            $attributes->setAttribute('width', $width);
        }
        if ($height = $this->getSetting('height')) {
            $attributes->setAttribute('height', $height);
        }
        return $attributes;
    }

}