Applying an oEmbed filter to a custom post type

Question

I have a function in my functions.php file which takes any embedded YouTube URL, appends &rel=0 to the end of the URL, and wraps it in a <div>. It works perfectly for YouTube URLs I paste into any page or post:

function embed_youtube_parameters( $code ) {
    if( strpos( $code, 'youtu.be' ) !== false || strpos( $code, 'youtube.com' ) !== false || strpos( $code, 'youtube-nocookie.com' ) !== false ) {
        $return = preg_replace( '@embed/([^"&]*)@', 'embed/$1&rel=0', $code );
    }
    return '<div class="video-container">' . $return . '</div>';
}
add_filter( 'embed_oembed_html', 'embed_youtube_parameters' );

I also have a custom post type (added via a plugin I use), which has a filter that I can use to customise the output of the single custom post type pages it generates. So I have that filter also in my functions.php file.

It's quite a long filter, but part of it looks like this:

<?php if ( get_cpt_meta( 'cpt_video_link' ) ) : ?>
<div class="cpt-video">
    <?php echo wp_oembed_get( get_cpt_meta( 'cpt_video_link' ) ); ?>
</div>
<?php endif; ?>

The custom post type uses a bunch of custom fields, one of which is for a YouTube URL (cpt_video_link). So the part of the filter I've shown above should echo the YouTube URL using wp_oembed_get, which - as far as I understand it - should work the same as pasting a YouTube URL onto a regular page or post - in the sense that it's using oEmbed.

My assumption is that - because it's using oEmbed - it should therefore also work with my embed_youtube_parameters function (above), meaning that it should have &rel=0 appended to the end of the URL, and wrapped in the <div class="video-container">.

However this is not the case, and I can't figure out why. My goal is for the embed_youtube_parameters function to be applied to my CPT filter. Can anyone give me some pointers as to why this isn't happening?

Answer 1

After looking at the code reference for wp_oembed_get (and WP_oEmbed::get_html()) I don't think embed_oembed_html fitler gets fired when that function is called. But I might have missed something.

You could try using WP_Embed::shortcode( array $attr, string $url = '' ) instead of wp_oembed_get as this would mimic what happens with the native post types and the filter would get fired, I think.

Something like this. Updated 23.12.19

<?php if ( get_cpt_meta( 'cpt_video_link' ) ) : ?>
  <div class="cpt-video">
    <?php
      $embed = new WP_Embed();
      echo $embed->shortcode(array(), get_cpt_meta( 'cpt_video_link' ));
    ?>
  </div>
<?php endif; ?>