php获取flv时间
[*]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, 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 $duration;
[*]
[*] }
[*]
[*] function fn($time){
[*]
[*] $num = $time;
[*]
[*] $sec = intval($num / 1000);
[*]
[*] $h = intval($sec / 3600);
[*]
[*] $m = intval(($sec % 3600) / 60);
[*]
[*] $s = intval(($sec % 60 ));
[*]
[*] $tm = $h . ':' . $m . ':' . $s ;
[*]
[*] return $tm;
[*]
[*] }
[*]
[*] echo getTime("27729.flv");//显示数字时间如236722
[*]
[*] echo fn(236722); //显示时间格式0:03:56
[*]
[*] ?>
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