PHP が FLV ビデオの時間長コードを取得する_PHP チュートリアル

php教程获取flvvideo時間间长度代码

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)){

return; 

}

$flv_data_length=filesize($name); 

$fp = @fopen($name, 'rb'); 

$flv_header = fread($fp, 5); 

fseek($fp, 5, seen_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, seen_cur); 

}

$duration = 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, seen_set); 

}

fclose($fp); 

$duration を返します。 

}

function fn($time){

$num = $time; 

$sec = intval($num / 1000); 

$h = intval($sec / 3600); 

$m = intval(($sec % 3600) / 60); 

$s = intval(($sec % 60 )); 

$tm = $h 。 ':' 。 $m 。 ':' 。 $s ; 

$tmを返します。 

}
echo gettime("27729.flv");//显示数字時刻间如236722
echo fn(236722); //表示時間间格式0:03:56

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