koel/app/Http/Streamers/TranscodingStreamer.php

67 lines
1.8 KiB
PHP

<?php
namespace App\Http\Streamers;
use App\Models\Song;
class TranscodingStreamer extends Streamer implements StreamerInterface
{
/**
* Bitrate which the stream should be transcoded as.
*
* @var int
*/
private $bitrate;
/**
* Time point to start transcoding from.
*
* @var int
*/
private $startTime;
public function __construct(Song $song, $bitrate, $startTime = 0)
{
parent::__construct($song);
$this->bitrate = $bitrate;
$this->startTime = $startTime;
}
/**
* On-the-fly stream the current song while transcoding.
*/
public function stream()
{
if (!is_executable($ffmpeg = env('FFMPEG_PATH', '/usr/local/bin/ffmpeg'))) {
abort(500, 'Transcoding requires valid ffmpeg settings.');
}
$bitRate = filter_var($this->bitrate, FILTER_SANITIZE_NUMBER_INT);
// Since we can't really know the content length of a file while it's still being transcoded,
// "calculating" it (like below) will be much likely to result in net::ERR_CONTENT_LENGTH_MISMATCH errors.
// Better comment these for now.
//
// header('Accept-Ranges: bytes');
// $bytes = round(($this->song->length * $bitRate * 1024) / 8);
// header("Content-Length: $bytes");
header('Content-Type: audio/mpeg');
header('Content-Disposition: attachment; filename="'.basename($this->song->path).'"');
$args = [
'-i '.escapeshellarg($this->song->path),
'-map 0:0',
'-v 0',
"-ab {$bitRate}k",
'-f mp3',
'-',
];
if ($this->startTime) {
array_unshift($args, "-ss {$this->startTime}");
}
passthru("$ffmpeg ".implode($args, ' '));
}
}