Using track metadata from audio shortcode

Question

How can i add an audio track in the editor and then access its metadata.
When you upload the audio track before inserting it you can fill in Artist info, track name, album and description.
Is there a way you can access that info to, for example, be able to output a metadata caption. Something like.

Audio Player.
Sting - Fields of gold - 1991.

Is it posible with shortcode attributes? like:

[audio scr="http://mywebsite.com/mytrack.mp3" title="The Title" artist="Artist" Album="album"] ??

Any other way to access it?

Answer 1

Yeah, you can access that data using get_post_meta, remember that almost everything in WordPress is a type of a post, an audio its a wp_attachment type, you just need the ID, also you can make a shortcode, this is an example:

function my_audio_func($atts) {
    $audio_id = $atts['id']; //we need an ID as attribute
    //we get the audio and the metadata
    $metadata = get_post_meta($audio_id, "_wp_attachment_metadata");
    echo "<pre>";
    var_dump($metadata);
    echo "</pre>";

    //we get the post object to get the URL of the AUDIO
    $audio = get_post($audio_id);
    $audio_src = $audio->guid;//for object values is like this is an object
    //
    $attr = array(
        'src' => $audio_src,
        'loop' => '',
        'autoplay' => '',
        'preload' => 'none'
    );
    //display the audio player
    echo wp_audio_shortcode($attr);
    echo "<br/>";
    //display the metadata ARTIST
    echo $metadata[0]["artist"];//for metadata like this is an array
}

add_shortcode('my_audio', 'my_audio_func');

in your post use it like this:

[my_audio id="198"]

it will show like this:

this is all the metadata keys, the info you can get:

array(1) {
  [0]=>
  array(16) {
    ["dataformat"]=>
    string(3) "mp3"
    ["channels"]=>
    int(2)
    ["sample_rate"]=>
    int(44100)
    ["bitrate"]=>
    int(128000)
    ["channelmode"]=>
    string(12) "joint stereo"
    ["bitrate_mode"]=>
    string(3) "cbr"
    ["lossless"]=>
    bool(false)
    ["encoder_options"]=>
    string(6) "CBR128"
    ["compression_ratio"]=>
    float(0.090702947845805)
    ["fileformat"]=>
    string(3) "mp3"
    ["filesize"]=>
    int(458918)
    ["mime_type"]=>
    string(10) "audio/mpeg"
    ["length"]=>
    int(29)
    ["length_formatted"]=>
    string(4) "0:29"
    ["artist"]=>
    string(6) "MY_ARTIST"
    ["album"]=>
    string(5) "MY_ALBUM"
  }
}

if you want the caption or name, that would be in the post object:

object(WP_Post)#587 (24) {
  ["ID"]=>
  int(198)
  ["post_author"]=>
  string(1) "1"
  ["post_date"]=>
  string(19) "2017-09-26 15:54:30"
  ["post_date_gmt"]=>
  string(19) "2017-09-26 15:54:30"
  ["post_content"]=>
  string(38) ""My test audio"."
  ["post_title"]=>
  string(35) "My test audio"
  ["post_excerpt"]=>
  string(10) "MY_CAPTION"
  ["post_status"]=>
  string(7) "inherit"
  ["comment_status"]=>
  string(4) "open"
  ["ping_status"]=>
  string(6) "closed"
  ["post_password"]=>
  string(0) ""
  ["post_name"]=>
  string(35) "my-test-audio"
  ["to_ping"]=>
  string(0) ""
  ["pinged"]=>
  string(0) ""
  ["post_modified"]=>
  string(19) "2017-09-26 17:36:59"
  ["post_modified_gmt"]=>
  string(19) "2017-09-26 17:36:59"
  ["post_content_filtered"]=>
  string(0) ""
  ["post_parent"]=>
  int(176)
  ["guid"]=>
  string(97) "http://my_testsite.com/wp-content/uploads/sites/4/2017/03/my-test-audio.mp3"
  ["menu_order"]=>
  int(0)
  ["post_type"]=>
  string(10) "attachment"
  ["post_mime_type"]=>
  string(10) "audio/mpeg"
  ["comment_count"]=>
  string(1) "0"
  ["filter"]=>
  string(3) "raw"
}

i commented in the shortcode how you can access values in the object and in the metadata array.