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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
// //
// FLV module by Seth Kaufman <seth@whirl-i-gig.com> //
// * version 0.1 (26 June 2005) //
// minor modifications by James Heinrich <info@getid3.org> //
// * version 0.1.1 (15 July 2005) //
/////////////////////////////////////////////////////////////////
// //
// module.audio-video.flv.php //
// module for analyzing Shockwave Flash Video files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_flv
{
function getid3_flv(&$fd, &$ThisFileInfo, $ReturnAllTagData=false) {
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$FLVfileData = fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
$FLVmagic = substr($FLVfileData, 0, 3);
if ($FLVmagic != 'FLV') {
$ThisFileInfo['error'][] = 'Expecting "FLV" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['flv']['header']['signature'].'"';
unset($ThisFileInfo['flv']);
unset($ThisFileInfo['fileformat']);
return false;
}
$ThisFileInfo['flv']['header']['signature'] = $FLVmagic;
$ThisFileInfo['flv']['header']['version'] = ord($FLVfileData{3});
$ThisFileInfo['fileformat'] = 'flv';
$TypeFlags = ord($FLVfileData{4});
$ThisFileInfo['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 4);
$ThisFileInfo['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 1);
$FrameSizeDataLength = getid3_lib::BigEndian2Int(substr($FLVfileData, 5, 4));
// FLV tags
$CurrentOffset = $FrameSizeDataLength;
$FLVdataLength = strlen($FLVfileData);
$Duration = 0;
$SoundFormat = null;
$VideoFormat = null;
while ($CurrentOffset < $FLVdataLength) {
// previous tag size
$PreviousTagLength = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset, 4));
$CurrentOffset += 4;
$TagType = ord(substr($FLVfileData, $CurrentOffset, 1));
$DataLength = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 1, 3));
$Timestamp = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 4, 3));
switch ($TagType) {
case 8:
if (is_null($SoundFormat)) {
$SoundInfo = ord(substr($FLVfileData, $CurrentOffset + 11, 1));
$SoundFormat = $SoundInfo & 0x07;
$ThisFileInfo['flv']['audio']['audioFormat'] = $SoundFormat;
$ThisFileInfo['flv']['audio']['audioRate'] = ($SoundInfo & 0x30) / 0x10;
$ThisFileInfo['flv']['audio']['audioSampleSize'] = ($SoundInfo & 0x40) / 0x40;
$ThisFileInfo['flv']['audio']['audioType'] = ($SoundInfo & 0x80) / 0x80;
}
break;
case 9:
if (is_null($VideoFormat)) {
$VideoInfo = ord(substr($FLVfileData, $CurrentOffset + 11, 1));
$VideoFormat = $VideoInfo & 0x07;
$ThisFileInfo['flv']['video']['videoCodec'] = $VideoFormat;
$PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 15, 2))) >> 7;
$PictureSizeType = $PictureSizeType & 0x0007;
$ThisFileInfo['flv']['header']['videoSizeType'] = $PictureSizeType;
switch ($PictureSizeType) {
case 0:
$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 16, 2));
$PictureSizeEnc <<= 1;
$ThisFileInfo['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8;
$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 17, 2));
$PictureSizeEnc <<= 1;
$ThisFileInfo['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8;
break;
case 1:
$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 16, 4));
$PictureSizeEnc <<= 1;
$ThisFileInfo['video']['resolution_x'] = ($PictureSizeEnc & 0xFFFF0000) >> 16;
$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVfileData, $CurrentOffset + 18, 4));
$PictureSizeEnc <<= 1;
$ThisFileInfo['video']['resolution_y'] = ($PictureSizeEnc & 0xFFFF0000) >> 16;
break;
case 2:
$ThisFileInfo['video']['resolution_x'] = 352;
$ThisFileInfo['video']['resolution_y'] = 288;
break;
case 3:
$ThisFileInfo['video']['resolution_x'] = 176;
$ThisFileInfo['video']['resolution_y'] = 144;
break;
case 4:
$ThisFileInfo['video']['resolution_x'] = 128;
$ThisFileInfo['video']['resolution_y'] = 96;
break;
case 5:
$ThisFileInfo['video']['resolution_x'] = 320;
$ThisFileInfo['video']['resolution_y'] = 240;
break;
case 6:
$ThisFileInfo['video']['resolution_x'] = 160;
$ThisFileInfo['video']['resolution_y'] = 120;
break;
default:
$ThisFileInfo['video']['resolution_x'] = 0;
$ThisFileInfo['video']['resolution_y'] = 0;
break;
}
}
break;
default:
// noop
break;
}
if ($Timestamp > $Duration) {
$Duration = $Timestamp;
}
$CurrentOffset += ($DataLength + 11);
}
$ThisFileInfo['playtime_seconds'] = $Duration / 1000;
$ThisFileInfo['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $ThisFileInfo['playtime_seconds'];
if ($ThisFileInfo['flv']['header']['hasAudio']) {
$ThisFileInfo['audio']['codec'] = $this->FLVaudioFormat($ThisFileInfo['flv']['audio']['audioFormat']);
$ThisFileInfo['audio']['sample_rate'] = $this->FLVaudioRate($ThisFileInfo['flv']['audio']['audioRate']);
$ThisFileInfo['audio']['bits_per_sample'] = $this->FLVaudioBitDepth($ThisFileInfo['flv']['audio']['audioSampleSize']);
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['flv']['audio']['audioType'] + 1; // 0=mono,1=stereo
$ThisFileInfo['audio']['lossless'] = ($ThisFileInfo['flv']['audio']['audioFormat'] ? false : true); // 0=uncompressed
$ThisFileInfo['audio']['dataformat'] = 'flv';
}
if (@$ThisFileInfo['flv']['header']['hasVideo']) {
$ThisFileInfo['video']['codec'] = $this->FLVvideoCodec($ThisFileInfo['flv']['video']['videoCodec']);
$ThisFileInfo['video']['dataformat'] = 'flv';
$ThisFileInfo['video']['lossless'] = false;
}
return true;
}
function FLVaudioFormat($id) {
$FLVaudioFormat = array(
0 => 'uncompressed',
1 => 'ADPCM',
2 => 'mp3',
5 => 'Nellymoser 8kHz mono',
6 => 'Nellymoser',
);
return (@$FLVaudioFormat[$id] ? @$FLVaudioFormat[$id] : false);
}
function FLVaudioRate($id) {
$FLVaudioRate = array(
0 => 5500,
1 => 11025,
2 => 22050,
3 => 44100,
);
return (@$FLVaudioRate[$id] ? @$FLVaudioRate[$id] : false);
}
function FLVaudioBitDepth($id) {
$FLVaudioBitDepth = array(
0 => 8,
1 => 16,
);
return (@$FLVaudioBitDepth[$id] ? @$FLVaudioBitDepth[$id] : false);
}
function FLVvideoCodec($id) {
$FLVaudioBitDepth = array(
2 => 'Sorenson H.263',
3 => 'Screen video',
);
return (@$FLVaudioBitDepth[$id] ? @$FLVaudioBitDepth[$id] : false);
}
}
?>
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