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            php語言

            用PHP讀取flv文件的播放時間長度

            時間:2025-05-16 14:33:54 php語言 我要投稿
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            用PHP讀取flv文件的播放時間長度

              代碼如下:

            用PHP讀取flv文件的播放時間長度

              <?php

              // +----------------------------------------------------------------------+

              // | PHP version 4&5 |

              // +----------------------------------------------------------------------+

              // | Copyright (c) 2007 JackieWangjackieit@hotmail.com |

              // +----------------------------------------------------------------------+

              // | 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;

              }

              ?>

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