diff options
Diffstat (limited to 'modules/getid3/module.audio-video.swf.php')
| -rw-r--r-- | modules/getid3/module.audio-video.swf.php | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/modules/getid3/module.audio-video.swf.php b/modules/getid3/module.audio-video.swf.php new file mode 100644 index 00000000..ac2ca6bc --- /dev/null +++ b/modules/getid3/module.audio-video.swf.php @@ -0,0 +1,154 @@ +<?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 <infoØgetid3*org> |
+// | Allan Hansen <ahØartemis*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; + } + +} + + +?>
\ No newline at end of file |