我会用过滤器wp_audio_shortcode:

/**
 * Filter the audio shortcode output.
 *
 * @since 3.6.0
 *
 * @param string $html    Audio shortcode HTML output.
 * @param array  $atts    Array of audio shortcode attributes.
 * @param string $audio   Audio file.
 * @param int    $post_id Post ID.
 * @param string $library Media library used for the audio shortcode.
 */
return apply_filters( \'wp_audio_shortcode\', $html, $atts, $audio, $post_id, $library );

function wpse_163324_audio_filter( $html, $atts, $audio, $post_id, $library ) {
    // Use something like
    // $meta_values = get_post_meta( $audio->ID, \'your_audio_metas\', true );
    // to get the meta values and add them to the var $html like
    // $html .= \'<div>your_content</div>\';
    return $html;
}
add_filter( \'wp_audio_shortcode\', \'wpse_163324_audio_filter\', 10, 5 );

我想跟进此事。出于某种原因，$音频变量为空。我使用$atts[“mp3”]值并搜索数据库以找到媒体ID，然后根据charlenemasters提供的答案获取元数据