我正在尝试修改自定义Web服务器应用程序以使用
HTML5视频.
它提供HTML5页面,其中包含基本的< video>标签,然后它需要处理实际内容的请求.
到目前为止,我能让它工作的唯一方法是将整个视频文件加载到内存中,然后在一个响应中将其发回.这不是一个实用的选择.我想逐件服务：发送回来,比方说,100 kb,等待浏览器请求更多.
我看到一个带有以下标题的请求：
http_version = 1.1 request_method = GET Host = ###.###.###.###:## User-Agent = Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 Accept = video/webm,video/ogg,video/*;q=0.9,application/ogg;q=0.7,audio/*;q=0.6,*/*;q=0.5 Accept-Language = en-US,en;q=0.5 Connection = keep-alive Range = bytes=0-
HTTP/1.1 206 Partial content Content-Type: video/mp4 Content-Range: bytes 0-99999 / 232725251 Content-Length: 100000
我得到了一些GET请求,如下所示
Cache-Control = no-cache Connection = Keep-Alive Pragma = getIfoFileURI.dlna.org Accept = */* User-Agent = NSPlayer/12.00.7601.17514 WMFSDK/12.00.7601.17514 GetContentFeatures.DLNA.ORG = 1 Host = ###.###.###.###:##
(没有任何迹象表明浏览器需要文件的任何特定部分.)无论我发送回浏览器,视频都不会播放.
如上所述,如果我尝试在同一HTTP数据包中一次发送整个230 MB文件,则相同的视频将正常播放.
有没有办法让这一切都能通过部分内容请求很好地工作？我正在使用Firefox进行测试,但它最终需要与所有浏览器一起使用.
解决方法
我知道这是一个老问题,但是如果它有帮助你可以尝试我们在代码库中使用的以下“模型”.
class Model_DownloadableFile {
private $full_path;
function __construct($full_path) {
$this->full_path = $full_path;
}
public function get_full_path() {
return $this->full_path;
}
// Function borrowed from (been cleaned up and modified slightly): https://stackoverflow.com/questions/157318/resumable-downloads-when-using-PHP-to-send-the-file/4451376#4451376
// Allows for resuming paused downloads etc
public function download_file_in_browser() {
// Avoid sending unexpected errors to the client - we should be serving a file,// we don't want to corrupt the data we send
@error_reporting(0);
// Make sure the files exists,otherwise we are wasting our time
if (!file_exists($this->full_path)) {
header('HTTP/1.1 404 Not Found');
exit;
}
// Get the 'Range' header if one was sent
if (isset($_SERVER['HTTP_RANGE'])) {
$range = $_SERVER['HTTP_RANGE']; // IIS/Some Apache versions
} else if ($apache = apache_request_headers()) { // Try Apache again
$headers = array();
foreach ($apache as $header => $val) {
$headers[strtolower($header)] = $val;
}
if (isset($headers['range'])) {
$range = $headers['range'];
} else {
$range = false; // We can't get the header/there isn't one set
}
} else {
$range = false; // We can't get the header/there isn't one set
}
// Get the data range requested (if any)
$filesize = filesize($this->full_path);
$length = $filesize;
if ($range) {
$partial = true;
list($param,$range) = explode('=',$range);
if (strtolower(trim($param)) != 'bytes') { // Bad request - range unit is not 'bytes'
header("HTTP/1.1 400 Invalid Request");
exit;
}
$range = explode(',',$range);
$range = explode('-',$range[0]); // We only deal with the first requested range
if (count($range) != 2) { // Bad request - 'bytes' parameter is not valid
header("HTTP/1.1 400 Invalid Request");
exit;
}
if ($range[0] === '') { // First number missing,return last $range[1] bytes
$end = $filesize - 1;
$start = $end - intval($range[0]);
} else if ($range[1] === '') { // Second number missing,return from byte $range[0] to end
$start = intval($range[0]);
$end = $filesize - 1;
} else { // Both numbers present,return specific range
$start = intval($range[0]);
$end = intval($range[1]);
if ($end >= $filesize || (!$start && (!$end || $end == ($filesize - 1)))) {
$partial = false;
} // Invalid range/whole file specified,return whole file
}
$length = $end - $start + 1;
} else {
$partial = false; // No range requested
}
// Determine the content type
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$contenttype = finfo_file($finfo,$this->full_path);
finfo_close($finfo);
// Send standard headers
header("Content-Type: $contenttype");
header("Content-Length: $length");
header('Content-Disposition: attachment; filename="' . basename($this->full_path) . '"');
header('Accept-Ranges: bytes');
// if requested,send extra headers and part of file...
if ($partial) {
header('HTTP/1.1 206 Partial Content');
header("Content-Range: bytes $start-$end/$filesize");
if (!$fp = fopen($this->full_path,'r')) { // Error out if we can't read the file
header("HTTP/1.1 500 Internal Server Error");
exit;
}
if ($start) {
fseek($fp,$start);
}
while ($length) { // Read in blocks of 8KB so we don't chew up memory on the server
$read = ($length > 8192) ? 8192 : $length;
$length -= $read;
print(fread($fp,$read));
}
fclose($fp);
} else {
readfile($this->full_path); // ...otherwise just send the whole file
}
// Exit here to avoid accidentally sending extra content on the end of the file
exit;
}
}
然后你像这样使用它：
(new Model_DownloadableFile('FULL/PATH/TO/FILE'))->download_file_in_browser();
