<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net ///
// or http://www.getid3.org ///
/////////////////////////////////////////////////////////////////
// //
// getid3.real.php - part of getID3() //
// See getid3.readme.txt for more details //
// //
/////////////////////////////////////////////////////////////////
function getRealHeaderFilepointer(&$fd, &$ThisFileInfo) {
$ThisFileInfo['fileformat'] = 'real';
$ThisFileInfo['bitrate'] = 0;
$ThisFileInfo['playtime_seconds'] = 0;
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$ChunkCounter = 0;
while (ftell($fd) < $ThisFileInfo['avdataend']) {
$ChunkData = fread($fd, 8);
$ChunkName = substr($ChunkData, 0, 4);
$ChunkSize = BigEndian2Int(substr($ChunkData, 4, 4));
if (ereg('^\.ra', $ChunkName)) {
$ThisFileInfo['error'] .= "\n".'This is a headerless RealAudio file that cannot be parsed by this version of getID3() - if you have documentation for this format, please send it to info@getid3.org';
unset($ThisFileInfo['bitrate']);
unset($ThisFileInfo['playtime_seconds']);
return false;
}
$ThisFileInfo['real']['chunks'][$ChunkCounter]['name'] = $ChunkName;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['offset'] = ftell($fd) - 8;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['length'] = $ChunkSize;
if (($ThisFileInfo['real']['chunks'][$ChunkCounter]['offset'] + $ThisFileInfo['real']['chunks'][$ChunkCounter]['length']) > $ThisFileInfo['avdataend']) {
$ThisFileInfo['error'] .= "\n".'Chunk "'.$ThisFileInfo['real']['chunks'][$ChunkCounter]['name'].'" at offset '.$ThisFileInfo['real']['chunks'][$ChunkCounter]['offset'].' claims to be '.$ThisFileInfo['real']['chunks'][$ChunkCounter]['length'].' bytes long, which is beyond end of file';
return false;
}
if ($ChunkSize > (FREAD_BUFFER_SIZE + 8)) {
$ChunkData .= fread($fd, FREAD_BUFFER_SIZE - 8);
fseek($fd, $ThisFileInfo['real']['chunks'][$ChunkCounter]['offset'] + $ChunkSize, SEEK_SET);
} else {
$ChunkData .= fread($fd, $ChunkSize - 8);
}
$offset = 8;
switch ($ChunkName) {
case '.RMF': // RealMedia File Header
$ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
switch ($ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version']) {
case 0:
$ThisFileInfo['real']['chunks'][$ChunkCounter]['file_version'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['headers_count'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
break;
default:
//$ThisFileInfo['warning'] .= "\n".'Expected .RMF-object_version to be "0", actual value is "'.$ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'].'" (should not be a problem)';
break;
}
break;
case 'PROP': // Properties Header
$ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] == 0) {
$ThisFileInfo['real']['chunks'][$ChunkCounter]['max_bit_rate'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_bit_rate'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['max_packet_size'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_packet_size'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['num_packets'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['duration'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['preroll'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['index_offset'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['data_offset'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['num_streams'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['flags_raw'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['real']['chunks'][$ChunkCounter]['duration'] / 1000;
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['duration'] > 0) {
$ThisFileInfo['bitrate'] += $ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_bit_rate'];
}
$ThisFileInfo['real']['chunks'][$ChunkCounter]['flags']['save_enabled'] = (bool) ($ThisFileInfo['real']['chunks'][$ChunkCounter]['flags_raw'] & 0x0001);
$ThisFileInfo['real']['chunks'][$ChunkCounter]['flags']['perfect_play'] = (bool) ($ThisFileInfo['real']['chunks'][$ChunkCounter]['flags_raw'] & 0x0002);
$ThisFileInfo['real']['chunks'][$ChunkCounter]['flags']['live_broadcast'] = (bool) ($ThisFileInfo['real']['chunks'][$ChunkCounter]['flags_raw'] & 0x0004);
}
break;
case 'MDPR': // Media Properties Header
$ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] == 0) {
$ThisFileInfo['real']['chunks'][$ChunkCounter]['stream_number'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['max_bit_rate'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_bit_rate'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['max_packet_size'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_packet_size'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['start_time'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['preroll'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['duration'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['stream_name_size'] = BigEndian2Int(substr($ChunkData, $offset, 1));
$offset += 1;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['stream_name'] = substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['stream_name_size']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['stream_name_size'];
$ThisFileInfo['real']['chunks'][$ChunkCounter]['mime_type_size'] = BigEndian2Int(substr($ChunkData, $offset, 1));
$offset += 1;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['mime_type'] = substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['mime_type_size']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['mime_type_size'];
$ThisFileInfo['real']['chunks'][$ChunkCounter]['type_specific_len'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['type_specific_data'] = substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['type_specific_len']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['type_specific_len'];
if (empty($ThisFileInfo['playtime_seconds'])) {
$ThisFileInfo['playtime_seconds'] = max($ThisFileInfo['playtime_seconds'], ($ThisFileInfo['real']['chunks'][$ChunkCounter]['duration'] + $ThisFileInfo['real']['chunks'][$ChunkCounter]['start_time']) / 1000);
}
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['duration'] > 0) {
if (strstr($ThisFileInfo['real']['chunks'][$ChunkCounter]['mime_type'], 'audio')) {
$ThisFileInfo['audio']['bitrate'] = (isset($ThisFileInfo['audio']['bitrate']) ? $ThisFileInfo['audio']['bitrate'] : 0) + $ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_bit_rate'];
$ThisFileInfo['audio']['dataformat'] = 'real';
$ThisFileInfo['audio']['lossless'] = false;
} elseif (strstr($ThisFileInfo['real']['chunks'][$ChunkCounter]['mime_type'], 'video')) {
$ThisFileInfo['video']['bitrate'] = (isset($ThisFileInfo['video']['bitrate']) ? $ThisFileInfo['video']['bitrate'] : 0) + $ThisFileInfo['real']['chunks'][$ChunkCounter]['avg_bit_rate'];
$ThisFileInfo['video']['dataformat'] = 'real';
$ThisFileInfo['video']['lossless'] = false;
$ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
}
$ThisFileInfo['bitrate'] = (isset($ThisFileInfo['video']['bitrate']) ? $ThisFileInfo['video']['bitrate'] : 0) + (isset($ThisFileInfo['audio']['bitrate']) ? $ThisFileInfo['audio']['bitrate'] : 0);
}
}
break;
case 'CONT': // Content Description Header
$ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] == 0) {
$ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['title_len'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['title'] = (string) substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['title_len']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['title_len'];
$ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['artist_len'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['artist'] = (string) substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['artist_len']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['artist_len'];
$ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['copyright_len'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['copyright'] = (string) substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['copyright_len']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['copyright_len'];
$ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['comment_len'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['comment'] = (string) substr($ChunkData, $offset, $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['comment_len']);
$offset += $ThisFileInfo['real']['chunks'][$ChunkCounter]['raw']['comment_len'];
$commentkeystocopy = array('title'=>'title', 'artist'=>'artist', 'copyright'=>'copyright', 'comment'=>'comment');
foreach ($commentkeystocopy as $key => $val) {
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]["$key"]) {
$ThisFileInfo['real']['comments']["$val"][] = trim($ThisFileInfo['real']['chunks'][$ChunkCounter]["$key"]);
}
}
}
break;
case 'DATA': // Data Chunk Header
// do nothing
break;
case 'INDX': // Index Section Header
$ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['object_version'] == 0) {
$ThisFileInfo['real']['chunks'][$ChunkCounter]['num_indices'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['stream_number'] = BigEndian2Int(substr($ChunkData, $offset, 2));
$offset += 2;
$ThisFileInfo['real']['chunks'][$ChunkCounter]['next_index_header'] = BigEndian2Int(substr($ChunkData, $offset, 4));
$offset += 4;
if ($ThisFileInfo['real']['chunks'][$ChunkCounter]['next_index_header'] == 0) {
// last index chunk found, ignore rest of file
return true;
} else {
// non-last index chunk, seek to next index chunk (skipping actual index data)
fseek($fd, $ThisFileInfo['real']['chunks'][$ChunkCounter]['next_index_header'], SEEK_SET);
}
}
break;
default:
$ThisFileInfo['warning'] .= "\n".'Unhandled RealMedia chunk "'.$ChunkName.'" at offset '.$ThisFileInfo['real']['chunks'][$ChunkCounter]['offset'];
break;
}
$ChunkCounter++;
}
return true;
}
?>
