koel/app/Http/Controllers/API/SongController.php

<?php

namespace App\Http\Controllers\API;

use App\Factories\StreamerFactory;
use App\Http\Requests\API\SongPlayRequest;
use App\Http\Requests\API\SongUpdateRequest;
use App\Models\Song;
use App\Services\MediaInformationService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Routing\Redirector;

class SongController extends Controller
{
    private $mediaInformationService;
    private $streamerFactory;

    public function __construct(MediaInformationService $mediaInformationService, StreamerFactory $streamerFactory)
    {
        $this->mediaInformationService = $mediaInformationService;
        $this->streamerFactory = $streamerFactory;
    }

    /**
     * Play/stream a song.
     *
     * @link https://github.com/phanan/koel/wiki#streaming-music
     *
     * @param SongPlayRequest $request
     * @param Song            $song      The song to stream.
     * @param null|bool       $transcode Whether to force transcoding the song.
     *                                   If this is omitted, by default Koel will transcode FLAC.
     * @param null|int        $bitRate   The target bit rate to transcode, defaults to OUTPUT_BIT_RATE.
     *                                   Only taken into account if $transcode is truthy.
     *
     * @return RedirectResponse|Redirector
     */
    public function play(SongPlayRequest $request, Song $song, $transcode = null, $bitRate = null)
    {
        return $this->streamerFactory
            ->createStreamer($song, $transcode, $bitRate, floatval($request->time))
            ->stream();
    }

    /**
     * Update songs info.
     *
     * @param SongUpdateRequest $request
     *
     * @return JsonResponse
     */
    public function update(SongUpdateRequest $request)
    {
        return response()->json(Song::updateInfo($request->songs, $request->data));
    }
}