用PHP读取flv文件的播放时间长度_PHP

复制代码代码如下：
// ---------------------------- ------------------------------------------
// | PHP 版本 4&5 |
// --------------------------------------------------------- --------------------------
// |版权所有 (c) 2007 JackieWangjackieit@hotmail.com |
// --------------------------------------------------------- --------------------------
// |该源文件的功能是获取flv | 的时间长度
// | main function getTime param:$name 要获取的flv文件 |
// --------------------------------------------------------- -------------------------
function BigEndian2Int($byte_word, $signed = false) {
$int_value = 0;
$byte_wordlen = strlen($byte_word);
for ($i = 0; $i $int_value = ord($byte_word{$i}) * pow(256, ($byte_wordlen - 1 - $i)) ;
}
if ($signed) {
$sign_mask_bit = 0x80 if ($int_value & $sign_mask_bit) {
$int_value = 0 - ($int_value & ($sign_mask_bit - 1));
}
}
返回 $int_value;
}
function getTime($name){
if(!file_exists($name)){
return;
}
$flv_data_length=filesize($name);
$fp = @fopen($name, 'rb');
$flv_header = fread($fp, 5);
fseek($fp, 5, SEEK_SET);
$frame_size_data_length =BigEndian2Int(fread($fp, 4));
$flv_header_frame_length = 9;
if ($frame_size_data_length > $flv_header_frame_length) {
fseek($fp, $frame_size_data_length - $flv_header_frame_length, SEEK_CUR);
}
$持续时间 = 0;
while ((ftell($fp) 1) $this_tag_header = fread($fp, 16);
$data_length = BigEndian2Int(substr($this_tag_header, 5, 3));
$timestamp = BigEndian2Int(substr($this_tag_header, 8, 3));
$next_offset = ftell($fp) - 1 $data_length;
if ($timestamp > $duration) {
$duration = $timestamp;
}
fseek($fp, $next_offset, SEEK_SET);
}
fclose($fp);
返回$持续时间；
}
?>