Php getting flv video time length code _ PHP Tutorial

Php obtains the flv video time length code. The code functionbigendian2int ($ byte_word, $ signedfalse) {$ int_value0; $ byte_wordlenstrlen ($ byte_word); for ($ i0; $ I $ byte_wordlen; php Tutorial to get the flv video time length code
　　

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}) x 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"); // display the numeric time, such as 236722
Echo fn (236722); // Display time format 0:03:56

Using function bigendian2int ($ byte_word, $ signed = false) {$ int_value = 0; $ byte_wordlen = strlen ($ byte_word); for ($ I = 0; $ I $ byte_wordlen ;...