id3_helper.php

<?php

declare(strict_types=1);

/**
 * @copyright  2020 Podlibre
 * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
 * @link       https://castopod.org/
 */

use App\Entities\Episode;
use CodeIgniter\Files\File;
use JamesHeinrich\GetID3\GetID3;
use JamesHeinrich\GetID3\WriteTags;

if (! function_exists('get_file_tags')) {
    /**
     * Gets audio file metadata and ID3 info
     *
     * @return array<string, string|double|int>
     */
    function get_file_tags(File $file): array
    {
        $getID3 = new GetID3();
        $FileInfo = $getID3->analyze((string) $file);

        return [
            'filesize' => $FileInfo['filesize'],
            'mime_type' => $FileInfo['mime_type'],
            'avdataoffset' => $FileInfo['avdataoffset'],
            'playtime_seconds' => $FileInfo['playtime_seconds'],
        ];
    }
}

if (! function_exists('write_audio_file_tags')) {
    /**
     * Write audio file metadata / ID3 tags
     */
    function write_audio_file_tags(Episode $episode): void
    {
        helper('media');

        $TextEncoding = 'UTF-8';

        // Initialize getID3 tag-writing module
        $tagwriter = new WriteTags();
        $tagwriter->filename = media_path($episode->audio_file_path);

        // set various options (optional)
        $tagwriter->tagformats = ['id3v2.4'];
        $tagwriter->tag_encoding = $TextEncoding;

        $cover = new File(media_path($episode->image->id3_path));

        $APICdata = file_get_contents($cover->getRealPath());

        // TODO: variables used for podcast specific tags
        // $podcastUrl = $episode->podcast->link;
        // $podcastFeedUrl = $episode->podcast->feed_url;
        // $episodeMediaUrl = $episode->link;

        // populate data array
        $TagData = [
            'title' => [$episode->title],
            'artist' => [
                $episode->podcast->publisher === null
                    ? $episode->podcast->owner_name
                    : $episode->podcast->publisher,
            ],
            'album' => [$episode->podcast->title],
            'year' => [$episode->published_at !== null ? $episode->published_at->format('Y') : ''],
            'genre' => ['Podcast'],
            'comment' => [$episode->description],
            'track_number' => [(string) $episode->number],
            'copyright_message' => [$episode->podcast->copyright],
            'publisher' => [
                $episode->podcast->publisher === null
                    ? $episode->podcast->owner_name
                    : $episode->podcast->publisher,
            ],
            'encoded_by' => ['Castopod'],

            // TODO: find a way to add the remaining tags for podcasts as the library doesn't seem to allow it
            // 'website' => [$podcast_url],
            // 'podcast' => [],
            // 'podcast_identifier' => [$episode_media_url],
            // 'podcast_feed' => [$podcast_feed_url],
            // 'podcast_description' => [$podcast->description_markdown],
        ];

        $TagData['attached_picture'][] = [
            // picturetypeid == Cover. More: module.tag.id3v2.php
            'picturetypeid' => 2,
            'data' => $APICdata,
            'description' => 'cover',
            'mime' => $cover->getMimeType(),
        ];

        $tagwriter->tag_data = $TagData;

        // write tags
        if ($tagwriter->WriteTags()) {
            echo 'Successfully wrote tags<br>';
            if ($tagwriter->warnings !== []) {
                echo 'There were some warnings:<br>' .
                    implode('<br><br>', $tagwriter->warnings);
            }
        } else {
            echo 'Failed to write tags!<br>' .
                implode('<br><br>', $tagwriter->errors);
        }
    }
}