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<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <info�getid3*org> |
// | Allan Hansen <ah�artemis*dk> |
// +----------------------------------------------------------------------+
// | module.audio-video.swf.php |
// | module for analyzing Macromedia Shockwave Flash files. |
// | dependencies: zlib support in PHP |
// +----------------------------------------------------------------------+
//
// $Id: module.audio-video.swf.php,v 1.2 2006/11/02 10:48:00 ah Exp $
class getid3_swf extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
$getid3->info['fileformat'] = 'swf';
$getid3->info['video']['dataformat'] = 'swf';
// http://www.openswf.org/spec/SWFfileformat.html
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$swf_file_data = fread($getid3->fp, $getid3->info['avdataend'] - $getid3->info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data
$getid3->info['swf']['header']['signature'] = substr($swf_file_data, 0, 3);
switch ($getid3->info['swf']['header']['signature']) {
case 'FWS':
$getid3->info['swf']['header']['compressed'] = false;
break;
case 'CWS':
$getid3->info['swf']['header']['compressed'] = true;
break;
default:
throw new getid3_exception('Expecting "FWS" or "CWS" at offset '.$getid3->info['avdataoffset'].', found "'.$getid3->info['swf']['header']['signature'].'"');
}
$getid3->info['swf']['header']['version'] = getid3_lib::LittleEndian2Int($swf_file_data{3});
$getid3->info['swf']['header']['length'] = getid3_lib::LittleEndian2Int(substr($swf_file_data, 4, 4));
if (!function_exists('gzuncompress')) {
throw new getid3_exception('getid3_swf requires --zlib support in PHP.');
}
if ($getid3->info['swf']['header']['compressed']) {
if ($uncompressed_file_data = @gzuncompress(substr($swf_file_data, 8))) {
$swf_file_data = substr($swf_file_data, 0, 8).$uncompressed_file_data;
} else {
throw new getid3_exception('Error decompressing compressed SWF data');
}
}
$frame_size_bits_per_value = (ord(substr($swf_file_data, 8, 1)) & 0xF8) >> 3;
$frame_size_data_length = ceil((5 + (4 * $frame_size_bits_per_value)) / 8);
$frame_size_data_string = str_pad(decbin(ord($swf_file_data[8]) & 0x07), 3, '0', STR_PAD_LEFT);
for ($i = 1; $i < $frame_size_data_length; $i++) {
$frame_size_data_string .= str_pad(decbin(ord(substr($swf_file_data, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);
}
list($x1, $x2, $y1, $y2) = explode("\n", wordwrap($frame_size_data_string, $frame_size_bits_per_value, "\n", 1));
$getid3->info['swf']['header']['frame_width'] = bindec($x2);
$getid3->info['swf']['header']['frame_height'] = bindec($y2);
// http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm
// Next in the header is the frame rate, which is kind of weird.
// It is supposed to be stored as a 16bit integer, but the first byte
// (or last depending on how you look at it) is completely ignored.
// Example: 0x000C -> 0x0C -> 12 So the frame rate is 12 fps.
// Byte at (8 + $frame_size_data_length) is always zero and ignored
$getid3->info['swf']['header']['frame_rate'] = getid3_lib::LittleEndian2Int($swf_file_data[9 + $frame_size_data_length]);
$getid3->info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($swf_file_data, 10 + $frame_size_data_length, 2));
$getid3->info['video']['frame_rate'] = $getid3->info['swf']['header']['frame_rate'];
$getid3->info['video']['resolution_x'] = intval(round($getid3->info['swf']['header']['frame_width'] / 20));
$getid3->info['video']['resolution_y'] = intval(round($getid3->info['swf']['header']['frame_height'] / 20));
$getid3->info['video']['pixel_aspect_ratio'] = (float)1;
if (($getid3->info['swf']['header']['frame_count'] > 0) && ($getid3->info['swf']['header']['frame_rate'] > 0)) {
$getid3->info['playtime_seconds'] = $getid3->info['swf']['header']['frame_count'] / $getid3->info['swf']['header']['frame_rate'];
}
// SWF tags
$current_offset = 12 + $frame_size_data_length;
$swf_data_length = strlen($swf_file_data);
while ($current_offset < $swf_data_length) {
$tag_ID_tag_length = getid3_lib::LittleEndian2Int(substr($swf_file_data, $current_offset, 2));
$tag_ID = ($tag_ID_tag_length & 0xFFFC) >> 6;
$tag_length = ($tag_ID_tag_length & 0x003F);
$current_offset += 2;
if ($tag_length == 0x3F) {
$tag_length = getid3_lib::LittleEndian2Int(substr($swf_file_data, $current_offset, 4));
$current_offset += 4;
}
unset($tag_data);
$tag_data['offset'] = $current_offset;
$tag_data['size'] = $tag_length;
$tag_data['id'] = $tag_ID;
$tag_data['data'] = substr($swf_file_data, $current_offset, $tag_length);
switch ($tag_ID) {
case 0: // end of movie
break 2;
case 9: // Set background color
$getid3->info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($tag_data['data'])), 6, '0', STR_PAD_LEFT));
break;
default:
/*
if ($ReturnAllTagData) {
$getid3->info['swf']['tags'][] = $tag_data;
}
*/
break;
}
$current_offset += $tag_length;
}
return true;
}
}
?>
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