WordPress at a glance
filter is not described

wp_audio_embed_handler filter-hook . WP 3.6.0

Filters the audio embed handler callback.

Usage

add_filter( 'wp_audio_embed_handler', 'filter_function_name_3320' );
function filter_function_name_3320( $handler ){
	// filter...

	return $handler;
}
$handler(callable)
Audio embed handler callback function.

Where the hook is called

wp_maybe_load_embeds()
wp-includes/embed.php 199
wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . join( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 );

Where the hook is used (in WP core)

Does not used.