php 读取视频文件播放时间长度

<form action=”” method=”get”>
<input type=”text” size=”40″ value=”” name=”filepath”>
<input type=”submit” value=”提交” name=”submit”>
</form>

<?php
function BigEndian2Int($byte_word, $signed = false) {
$int_value = 0;
$byte_wordlen = strlen($byte_word);
for ($i = 0; $i < $byte_wordlen; $i++) {
$int_value += ord($byte_word{$i}) * pow(256, ($byte_wordlen – 1 –
$i));
}
if ($signed) {
$sign_mask_bit = 0x80 << (8 * ($byte_wordlen – 1));
if ($int_value & $sign_mask_bit) {
$int_value = 0 – ($int_value & ($sign_mask_bit – 1));
}
}
return $int_value;
}
function getTime($name){
if(!file_exists($name)){
echo “文件不存在”;exit;
}
$flv_data_length=filesize($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);
}
$duration = 0;
while ((ftell($fp) + 1) < $flv_data_length) {
$this_tag_header = fread($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);
return $duration;
}
if($_GET[‘submit’])
{
echo date(‘i分s秒’,getTime($_GET[‘filepath’])/1000);
}
?>

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