用PHP读取flv文件的播放时间长度
2015-01-24信息快讯网
用PHP读取flv文件的播放时间长度的代码,需要用的朋友可以参考下。
<?php // +----------------------------------------------------------------------+ // | PHP version 4&5 | // +----------------------------------------------------------------------+ // | Copyright (c) 2007 [email protected] | // +----------------------------------------------------------------------+ // | This source file's function is to get the time length of flv | // | main function getTime param:$name The flv file you want to get | // +----------------------------------------------------------------------+ function BigEndian2Int($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; } ?>