[wp-trac] [WordPress Trac] #28619: Add more filters to tune audio and video shortcode library

[WordPress Trac]

#28619: Add more filters to tune audio and video shortcode library
-------------------------+-----------------------------
 Reporter:  Fab1en       |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Media        |    Version:  3.9.1
 Severity:  normal       |   Keywords:
  Focuses:               |
-------------------------+-----------------------------
 `wp_video_shortcode_library` and `wp_audio_shortcode_library` allow a
 plugin author to replace the default mediaelement.js library by another
 Audio/Video js library. But then, possibilities to modify the html
 rendering are very limited.

 I have identified 2 points where a filter/action is needed :

   1. L1782 in wp-includes/media.php
 (https://github.com/WordPress/WordPress/blob/3.9.1/wp-
 includes/media.php#L1792)

 {{{
 $html = '';
 if ( 'mediaelement' === $library && 1 === $instances )
         $html .= "<!--[if lt IE
 9]><script>document.createElement('video');</script><![endif]-->\n";
 }}}

   2. L1820 in wp-includes/media.php
 (https://github.com/WordPress/WordPress/blob/3.9.1/wp-
 includes/media.php#L1820)

 {{{
 if ( 'mediaelement' === $library )
         $html .= wp_mediaelement_fallback( $fileurl );
 }}}

 Plugin author should be able to add arbitrary HTML code before and inside
 the `<video>` tag as easily as this is done for mediaelement.

 This could be done by replacing the previous lines with an filter call,
 and doing the mediaelement stuff inside the filter callback that can be
 unregistered and replaced by plugins.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28619>
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