php获取flv视频时间_PHP教程

 
　　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);  <						

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