iOS 11 播客应用程序在大约 20 秒时开始播放播客

Question

在 iOS 11 更新后，我客户的所有播客都会在 iTunes 应用程序中的二十到四十秒左右重新开始。 iOS 10 播放器不显示此问题。目前还没有其他玩家表现出这个问题，并且一旦剧集重新开始，它就会毫无问题地播放到最后。在任何给定的剧集中，重新启动都保持在同一点，但我怀疑它在较长的剧集中发生得更远，就好像它可能处于持续时间的某个百分比一样。

FF 和 RW 功能，包括拖动播放头都可以工作。

无论是否允许 iTunes 播客应用下载剧集文件，该应用都会重新启动。

几周以来，我们与 Apple 支持人员的合作一直不成功，我想我也应该在这里提出这个问题。

Apple 支持人员已检查了 mp3 文件和 RSS 源，没有发现任何问题。

<enclosure url="http://example.com/audio/episodes/2018_04_18_1458_some-show.mp3" length="63773956" type="audio/mpeg"/>
<pubDate>Wed, 18 Apr 2018 00:00:00 -0500</pubDate>
<itunes:duration>1:06:25</itunes:duration>

客户端的生死取决于 Google Analytics 统计数据，因此我们在 htaccess 中使用 mod_rewrite 路由 MP3 的入站请求，如下所示

RewriteCond %{HTTP_REFERER} !^http://(www\.)?example\.com [NC]
RewriteRule ^audio/episodes/([^/\.]+).mp3$/audio/episodes/google_analytics_mp3.php?mp3=$1&redirected=1 [L,QSA]

测试表明，当删除路由时，在以前未播放的剧集中不会出现该问题。之前播放过的剧集仍然存在该问题。

google_analytics_mp3.php:

<?php
    include_once($_SERVER['DOCUMENT_ROOT']."/classDBI/classDBI.php");
    include_once($_SERVER['DOCUMENT_ROOT']."/classDBI/google_analytics_api.php");   
    $e = new Episode;

    if (is_numeric($_REQUEST['mp3'])) {
        $id = intval($_REQUEST['mp3']);
        list($ep) = $e->retrieve("id = $id");   
        if ($ep) { 
            $outcome = ga_send_pageview(basename($ep->audio_link), 'Site streaming: ' . $ep->google_title()); 
        }
    } else if ($_REQUEST['redirected'] == 1) {
        $fileName = $_GET['mp3'] . '.mp3';
        $fileLocation = $_SERVER['DOCUMENT_ROOT'].'/audio/episodes/'.$fileName;
        $etag = md5_file($fileName);
        $fileRedirect = '/audio/episodes/'.$fileName;

        if (file_exists($fileLocation)) {
            list($ep) = $e->retrieve("audio_link = 'audio/episodes/$fileName'");
            $pageName = 'Direct access';
            if ($ep) {
                $pageName .= ': ' . $ep->google_title();
            }

            $size  = filesize($fileLocation);
            $time  = date('r', filemtime($fileLocation));

            $fm = @fopen($fileLocation, 'rb');
            if (!$fm) {
                header ("HTTP/1.1 505 Internal server error");
                return;
            }

            $begin  = 0;
            $end  = $size - 1;

            if (isset($_SERVER['HTTP_RANGE'])) {
                if (preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches)) {
                    $begin  = intval($matches[1]);
                    if (!empty($matches[2])) {
                      $end  = intval($matches[2]);
                    }
                }
            }
            if (isset($_SERVER['HTTP_RANGE'])) {
                header('HTTP/1.1 206 Partial Content');
                if ($begin == 0) {
                    $outcome = ga_send_pageview($fileName, 'Streaming: ' . $pageName); 
                }
            } else{
                header('HTTP/1.1 200 OK');
                $outcome = ga_send_pageview($fileName, $pageName);
            }


            header("Content-Transfer-Encoding: binary"); 
            header('Content-Type: audio/mpeg');
            header("Etag: $etag"); 
            header('Cache-Control: public, must-revalidate, max-age=0');
            header('Pragma: no-cache');         
            header('Accept-Ranges: bytes');
            header('Content-Length:' . (($end - $begin) + 1));
            header('Content-Disposition: inline; filename="'.$fileName.'"');
            //  2018.01.14 changes
            if (isset($_SERVER['HTTP_RANGE'])) {
                header("Content-Range: bytes $begin-$end/$size");
            }
            // END 2018.01.14 changes

            readfile($fileLocation);
            header("Last-Modified: $time");

            $cur  = $begin;
            fseek($fm, $begin, 0);

            while(!feof($fm) && $cur <= $end && (connection_status() == 0)) {
                print fread($fm, min(1024 * 16, ($end - $cur) + 1));
                $cur += 1024 * 16;
            }

            exit();
        }
    }

我非常确定我处理 header 的方式导致了重新启动问题，但我找不到错误。

以下是来自 Chrome 开发面板的 mp3 请求的 header 。 IP 地址更改为文件名:

General

Request URL: http://example.com/audio/episodes/2018_04_18_1458_some-show.mp3
Request Method: GET
Status Code: 200 OK
Remote Address: 205.196.xxx.xxx:80
Referrer Policy: no-referrer-when-downgrade

Response Headers

Accept-Ranges: bytes
Cache-Control: public, must-revalidate, max-age=0
Connection: Keep-Alive
Content-Disposition: inline; filename="2018_04_18_1458_some-show.mp3"
Content-Length: 63773956
Content-Transfer-Encoding: binary
Content-Type: audio/mpeg
Date: Fri, 20 Apr 2018 16:27:57 GMT
Etag: 7fe7b0375cd99ec4d928b1a8885bee81
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Keep-Alive: timeout=2, max=100
Pragma: no-cache
Server: Apache

Request Headers

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cache-Control: no-cache
Connection: keep-alive
Cookie: PHPSESSID=TYDy9IZXJwTCBlmXVmkHn0; _ga=GA1.2.904913110.1515511103; _gid=GA1.2.666994959.1523989189; __unam=739f578-160db803df3-1cf2ee83-70
Host: www.example.com
Pragma: no-cache
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36

如果它有帮助，这里是 google_analytics_api.php:

<?php
define('GOOGLEACCOUNT', 'UA-xxxxxxxx-1');
define('GOOGLEDOMAIN', $_SERVER['HTTP_HOST']);

function gaParseCookie() {
    if (isset($_COOKIE['_ga'])) {
        list($version, $domainDepth, $cid1, $cid2) = explode('.', $_COOKIE["_ga"], 4);
        $contents = array('version' => $version, 'domainDepth' => $domainDepth, 'cid' => $cid1 . '.' . $cid2);
        $cid = $contents['cid'];
    } else {
        $cid = gaGenerateUUID();
    }
    return $cid;
}


function gaGenerateUUID() {
    return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
        mt_rand(0, 0xffff), mt_rand(0, 0xffff),
        mt_rand(0, 0xffff),
        mt_rand(0, 0x0fff) | 0x4000,
        mt_rand(0, 0x3fff) | 0x8000,
        mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
    );
}

function gaSendData($data) {
    $getString = 'https://ssl.google-analytics.com/collect';
    $getString .= '?payload_data&';
    $getString .= http_build_query($data);
    $options = array(
        CURLOPT_CUSTOMREQUEST  =>"GET",
        CURLOPT_POST           =>false,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_ENCODING       => "",
        CURLOPT_CONNECTTIMEOUT => 120,
        CURLOPT_TIMEOUT        => 120,
        CURLOPT_MAXREDIRS      => 10,
    );

    $ch      = curl_init( $getString );
    curl_setopt_array( $ch, $options );
    $result = curl_exec( $ch );
    $err     = curl_errno( $ch );
    $errmsg  = curl_error( $ch );
    $header  = curl_getinfo( $ch );
    if ($err) {
        mail('email@example.com', 'Analytics MP3 Error' . __FILE__, "$err\n\n$errmsg\n\n$header");  
    }
    curl_close( $ch );
    return $result;
}


function ga_send_pageview($file, $title) {
    $data = array(
        'v' => 1,
        'tid' => GOOGLEACCOUNT, 
        'cid' => gaParseCookie(),
        't' => 'pageview',
        'dh' => GOOGLEDOMAIN, 
        'dp' => $file, 
        'dt' => $title 
    );
    if(strlen($_SERVER['HTTP_REFERER'])) {
        $data['utmr'] = $_SERVER['HTTP_REFERER'];
    } 
    if (strlen($_SERVER['HTTP_USER_AGENT'])) {
        $data['ua'] = $_SERVER['HTTP_USER_AGENT'];
    }
    gaSendData($data);
}


function ga_send_event($category=null, $action=null, $label=null) {
    $data = array(
        'v' => 1,
        'tid' => GOOGLEACCOUNT, 
        'cid' => gaParseCookie(),
        't' => 'event',
        'ec' => $category, //Category (Required)
        'ea' => $action, //Action (Required)
        'el' => $label 
    );
    gaSendData($data);
}

非常感谢任何建议!

Answer 1

问题证明，播客应用程序似乎已将初始请求中 HTTP_RANGE 末尾发送的内容更改为 1，如下所示:

[HTTP_RANGE] => bytes=0-1

此代码正在解析 header

if (isset($_SERVER['HTTP_RANGE'])) {
            if (preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches)) {
                $begin  = intval($matches[1]);
                if (!empty($matches[2])) {
                  $end  = intval($matches[2]);
                }
            }
        }

生成的出站 Content-Range header 看起来类似于 0-1/59829252

这将导致立即发出重新启动播客的第二个请求。

通过用 $size - 1 替换最终值 1 来修复。