/**
* Get a files meta data and cuepoints
*
* @param string $filename
* @return array $meta
*/
function getMeta( $file ) {
// Open file
$f = fopen( $file,'rb' );
// Read header
$buffer = fread( $f, 9 );
$header = @unpack( 'C3signature/Cversion/Cflags/Noffset', $buffer );
// If signature is valid, go on
if( $header['signature1'] == 70 && $header['signature2'] == 76 && $header['signature3'] == 86 ){
// Read tags
fseek( $f, $header['offset'] );
while( feof( $f ) == false ){
// Read tag header and check length
$buffer = fread( $f, 15 );
if( strlen( $buffer ) < 15) break;
// Interpret header
$tag = @unpack( 'Nprevsize/C1type/C3size/C4timestamp/C3stream', $buffer );
$tag['size'] = ( $tag['size1'] << 16 ) + ( $tag['size2'] << 8 ) + ( $tag['size3'] );
if( !$tag['size'] ) break;
// Read tag body (max 16k)
$next = ftell( $f ) + $tag['size'];
$body = fread( $f, min( $tag['size'], 16384 ) );
// Seek
fseek( $f, $next );
switch( $tag['type'] ){
case 0x09:
// Unpack flags
$info = @unpack( 'Cflags', $body );
// Get frame type and store it
$ft = ( $info['flags'] >> 4 ) & 15;
if( !isset( $fw ) && !isset( $fh ) && $ft == 0x01 ){
switch( $info['flags'] & 15 ){
case 0x04:
case 0x05:
//codec_on2_vp6:
//codec_on2_vp6alpha:
$fw = ord( $body[5] )*16;
$fh = ord( $body[6] )*16;
break;
//codec_sorenson_h263:
case 0x02:
$bin = '';
for( $i=0; $i<16; $i++ ){
$sbin = decbin( ord( $body[$i+1] ) );
$bin .= str_pad( $sbin, 8, '0', STR_PAD_LEFT );
}
// Size type
$size = bindec( substr( $bin, 30, 3 ) );
// Get width/height
switch ($size) {
case 0: // Custom, 8 bit
$fw = bindec( substr( $bin, 33, 8 ) );
$fh = bindec( substr( $bin, 41, 8 ) );
break;
case 1: // Custom, 16 bit
$fw = bindec( substr( $bin, 33, 16 ) );
$fh = bindec( substr( $bin, 49, 16 ) );
break;
case 2:
$fw = 352;
$fh = 288;
break;
case 3:
$fw = 176;
$fh = 144;
break;
case 4:
$fw = 128;
$fh = 96;
break;
case 5:
$fw = 320;
$fh = 240;
break;
case 6:
$fw = 160;
$fh = 120;
break;
}
break;
}
}
break;
case 0x12:
$parser = new AMF0Parser();
// Parse data
$data = $parser->readAllPackets( $body );
$meta = $data[0] == 'onMetaData' ? $data[1] : array('width'=>'', 'height'=>'', 'duration'=>'');
break;
}
}// while
}
// Close file
fclose( $f );
// Width
if ( isset( $fw ) && !isset( $meta['width'] ) ) {
$meta['width'] = $fw;
}
// Height
if ( isset( $fh ) && !isset( $meta['height'] ) ) {
$meta['height'] = $fh;
}
if( isset( $meta['duration'] ) ){
$time = abs( $meta['duration'] );
$minutes = floor( $time / 60);
$seconds = round( ( ( $time / 60 ) - floor( $time / 60 ) ) * 60 );
if( $seconds >= 60 ){
$seconds -= 60;
$minutes++;
}
$meta['duration'] = $minutes . ':' . str_pad( $seconds, 2, 0, STR_PAD_LEFT );
}else{
$meta['duration'] = 0;
}
return $meta;
}
/**
* Rewrite (or strip) meta data and cuepoints from FLV file
*
* @author Tommy Lacroix <*****@*****.**>
* @access public
* @param string $in Input file
* @param string $out Output file (must be different!)
* @param string[] $meta Meta data (ie. array('width'=>320,'height'=>240,...), optional
* @param array $cuepoints Cuepoints (ie. array(array('name'=>'cue1','time'=>'4.4',type=>'event'),...), optional
*/
public function rewriteMeta($in, $out, $meta = false, $cuepoints = false)
{
// No tag found yet
$tagParsed = 0;
// Open input file
$f = fopen($in, 'rb');
// Read header
$buf = fread($f, 9);
$header = unpack('C3signature/Cversion/Cflags/Noffset', $buf);
// Check signature
$signature = $header['signature1'] == 70 && $header['signature2'] == 76 && $header['signature3'] == 86;
// If signature is valid, go on
if ($signature) {
// Open output file, and write header
$o = fopen($out, 'w');
if (!$o) {
throw new Exception('Cannot open output file!');
}
fwrite($o, $buf, 9);
// Version
//$version = $header['version'];
// Write meta data
if ($meta !== false) {
$parser = new AMF0Parser();
$metadata = $parser->writeString('onMetaData');
$metadata .= $parser->writeMixedArray($meta);
$metadataSize = substr(pack('N', strlen($metadata)), 1);
// Write
$metadataHead = pack('N', 0) . chr(18) . $metadataSize . pack('N', 0) . chr(0) . chr(0) . chr(0);
fwrite($o, $metadataHead);
fwrite($o, $metadata);
}
// Read tags
//$prevTagSize = 0;
$lastTimeStamp = 0;
do {
// Read tag header and check length
$buf = fread($f, 15);
if (strlen($buf) < 15) {
break;
}
// Interpret header
$tagInfo = unpack('Nprevsize/C1type/C3size/C4timestamp/C3stream', $buf);
$tagInfo['size'] = ($tagInfo['size1'] << 16) + ($tagInfo['size2'] << 8) + $tagInfo['size3'];
$tagInfo['stream'] = ($tagInfo['stream1'] << 16) + ($tagInfo['stream2'] << 8) + $tagInfo['stream3'];
$tagInfo['timestamp'] = ($tagInfo['timestamp1'] << 16) + ($tagInfo['timestamp2'] << 8) + $tagInfo['timestamp3'] + ($tagInfo['timestamp4'] << 24);
// Need we insert a cuepoint here?
if ($cuepoints !== false) {
foreach ($cuepoints as $index => $cuepoint) {
if ($lastTimeStamp < $cuepoint['time'] * 1000 && $tagInfo['timestamp'] >= $cuepoint['time'] * 1000) {
// Write cuepoint
$parser = new AMF0Parser();
$metadata = $parser->writeString('onCuePoint');
$metadata .= $parser->writeMixedArray($cuepoint);
$metadataSize = substr(pack('N', strlen($metadata)), 1);
// Write first
$metadataHead = pack('N', $tagInfo['prevsize']) . chr(18) . $metadataSize . pack('N', 0) . chr(0) . chr(0) . chr(0);
fwrite($o, $metadataHead);
fwrite($o, $metadata);
// Update prevsize in $buf
// @todo
// Unset cuepoint
unset($cuepoints[$index]);
}
}
}
// Validate previous offset
//if ($tagInfo['prevsize'] != $prevTagSize) {
// Do nothing
//}
// Read tag body
$body = fread($f, $tagInfo['size']);
// Intepret body
switch ($tagInfo['type']) {
case 0x9:
// Video tag
// Write to output file
fwrite($o, $buf, 15);
fwrite($o, $body, $tagInfo['size']);
break;
case 0x8:
// Audio tag
// Write to output file
fwrite($o, $buf, 15);
fwrite($o, $body, $tagInfo['size']);
break;
case 0x12:
// Meta tag
// Skip
break;
}
// Increase parsed tag count
$tagParsed++;
} while (feof($f) == false);
}
// Close file
fclose($f);
fclose($o);
}
