diff options
Diffstat (limited to 'getid3/module.audio-video.swf.php')
| -rw-r--r-- | getid3/module.audio-video.swf.php | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/getid3/module.audio-video.swf.php b/getid3/module.audio-video.swf.php new file mode 100644 index 0000000..c3dbb36 --- /dev/null +++ b/getid3/module.audio-video.swf.php @@ -0,0 +1,149 @@ +<?php +///////////////////////////////////////////////////////////////// +/// getID3() by James Heinrich <info@getid3.org> // +// available at http://getid3.sourceforge.net // +// or http://www.getid3.org // +///////////////////////////////////////////////////////////////// +// See readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio-video.swf.php // +// module for analyzing Shockwave Flash files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + + +class getid3_swf +{ + + function getid3_swf(&$fd, &$ThisFileInfo, $ReturnAllTagData=false) { +//$start_time = microtime(true); + $ThisFileInfo['fileformat'] = 'swf'; + $ThisFileInfo['video']['dataformat'] = 'swf'; + + // http://www.openswf.org/spec/SWFfileformat.html + + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + + $SWFfileData = fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data + + $ThisFileInfo['swf']['header']['signature'] = substr($SWFfileData, 0, 3); + switch ($ThisFileInfo['swf']['header']['signature']) { + case 'FWS': + $ThisFileInfo['swf']['header']['compressed'] = false; + break; + + case 'CWS': + $ThisFileInfo['swf']['header']['compressed'] = true; + break; + + default: + $ThisFileInfo['error'][] = 'Expecting "FWS" or "CWS" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['swf']['header']['signature'].'"'; + unset($ThisFileInfo['swf']); + unset($ThisFileInfo['fileformat']); + return false; + break; + } + $ThisFileInfo['swf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 3, 1)); + $ThisFileInfo['swf']['header']['length'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 4, 4)); + +//echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; + + if ($ThisFileInfo['swf']['header']['compressed']) { + + $SWFHead = substr($SWFfileData, 0, 8); + $SWFfileData = substr($SWFfileData, 8); + if ($decompressed = @gzuncompress($SWFfileData)) { + + $SWFfileData = $SWFHead.$decompressed; + + } else { + + $ThisFileInfo['error'][] = 'Error decompressing compressed SWF data ('.strlen($SWFfileData).' bytes compressed, should be '.($ThisFileInfo['swf']['header']['length'] - 8).' bytes uncompressed)'; + return false; + + } + + } +//echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; + + $FrameSizeBitsPerValue = (ord(substr($SWFfileData, 8, 1)) & 0xF8) >> 3; + $FrameSizeDataLength = ceil((5 + (4 * $FrameSizeBitsPerValue)) / 8); + $FrameSizeDataString = str_pad(decbin(ord(substr($SWFfileData, 8, 1)) & 0x07), 3, '0', STR_PAD_LEFT); + for ($i = 1; $i < $FrameSizeDataLength; $i++) { + $FrameSizeDataString .= str_pad(decbin(ord(substr($SWFfileData, 8 + $i, 1))), 8, '0', STR_PAD_LEFT); + } + list($X1, $X2, $Y1, $Y2) = explode("\n", wordwrap($FrameSizeDataString, $FrameSizeBitsPerValue, "\n", 1)); + $ThisFileInfo['swf']['header']['frame_width'] = getid3_lib::Bin2Dec($X2); + $ThisFileInfo['swf']['header']['frame_height'] = getid3_lib::Bin2Dec($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 + $FrameSizeDataLength) is always zero and ignored + $ThisFileInfo['swf']['header']['frame_rate'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 9 + $FrameSizeDataLength, 1)); + $ThisFileInfo['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($SWFfileData, 10 + $FrameSizeDataLength, 2)); + + $ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['swf']['header']['frame_rate']; + $ThisFileInfo['video']['resolution_x'] = intval(round($ThisFileInfo['swf']['header']['frame_width'] / 20)); + $ThisFileInfo['video']['resolution_y'] = intval(round($ThisFileInfo['swf']['header']['frame_height'] / 20)); + $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1; + + if (($ThisFileInfo['swf']['header']['frame_count'] > 0) && ($ThisFileInfo['swf']['header']['frame_rate'] > 0)) { + $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['swf']['header']['frame_count'] / $ThisFileInfo['swf']['header']['frame_rate']; + } +//echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; + + + // SWF tags + + $CurrentOffset = 12 + $FrameSizeDataLength; + $SWFdataLength = strlen($SWFfileData); + + while ($CurrentOffset < $SWFdataLength) { +//echo __LINE__.'='.number_format(microtime(true) - $start_time, 3).'<br>'; + + $TagIDTagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 2)); + $TagID = ($TagIDTagLength & 0xFFFC) >> 6; + $TagLength = ($TagIDTagLength & 0x003F); + $CurrentOffset += 2; + if ($TagLength == 0x3F) { + $TagLength = getid3_lib::LittleEndian2Int(substr($SWFfileData, $CurrentOffset, 4)); + $CurrentOffset += 4; + } + + unset($TagData); + $TagData['offset'] = $CurrentOffset; + $TagData['size'] = $TagLength; + $TagData['id'] = $TagID; + $TagData['data'] = substr($SWFfileData, $CurrentOffset, $TagLength); + switch ($TagID) { + case 0: // end of movie + break 2; + + case 9: // Set background color + //$ThisFileInfo['swf']['tags'][] = $TagData; + $ThisFileInfo['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($TagData['data'])), 6, '0', STR_PAD_LEFT)); + break; + + default: + if ($ReturnAllTagData) { + $ThisFileInfo['swf']['tags'][] = $TagData; + } + break; + } + + $CurrentOffset += $TagLength; + } + + return true; + } + +} + + +?>
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