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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 1425 | /** | 
| 1426 |  * Determines if default embed handlers should be loaded. | 
| 1427 |  * | 
| 1428 |  * Checks to make sure that the embeds library hasn't already been loaded. If | 
| 1429 |  * it hasn't, then it will load the embeds library. | 
| 1430 |  * | 
| 1431 |  * @since 2.9.0 | 
| 1432 |  */ | 
| 1433 | function wp_maybe_load_embeds() { | 
| 1434 |      if ( ! apply_filters( 'load_default_embeds', true ) ) | 
| 1435 |           return; | 
| 1436 |      wp_embed_register_handler( 'googlevideo', '#http://video\.google\.([A-Za-z.]{2,5})/videoplay\?docid=([\d-]+)(.*?)#i', 'wp_embed_handler_googlevideo' ); | 
| 1437 |      wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . join( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 ); | 
| 1438 |      wp_embed_register_handler( 'video', '#^https?://.+?\.(' . join( '|', wp_get_video_extensions() ) . ')$#i', apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' ), 9999 ); | 
| 1439 | } | 
| 1440 |  | 
| 1441 | /** | 
| 1442 |  * The Google Video embed handler callback. Google Video does not support oEmbed. | 
| 1443 |  * |