php获取flv视频时间_PHP教程
程序员文章站
2022-05-31 20:17:42
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php获取flv时间!有源码!拿来就可以使用!超级简单。
- 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 $byte_wordlen - 1));
- if ($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);