public function ParseOptimFROGheader45()
{
// for fileformat of v4.50a and higher
$info =& $this->getid3->info;
$RIFFdata = '';
$this->fseek($info['avdataoffset']);
while (!feof($this->getid3->fp) && $this->ftell() < $info['avdataend']) {
$BlockOffset = $this->ftell();
$BlockData = $this->fread(8);
$offset = 8;
$BlockName = substr($BlockData, 0, 4);
$BlockSize = Utils::LittleEndian2Int(substr($BlockData, 4, 4));
if ($BlockName == 'OFRX') {
$BlockName = 'OFR ';
}
if (!isset($info['ofr'][$BlockName])) {
$info['ofr'][$BlockName] = array();
}
$thisfile_ofr_thisblock =& $info['ofr'][$BlockName];
switch ($BlockName) {
case 'OFR ':
// shortcut
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
$info['audio']['encoder'] = 'OptimFROG 4.50 alpha';
switch ($BlockSize) {
case 12:
case 15:
// good
break;
default:
$info['warning'][] = '"' . $BlockName . '" contains more data than expected (expected 12 or 15 bytes, found ' . $BlockSize . ' bytes)';
break;
}
$BlockData .= $this->fread($BlockSize);
$thisfile_ofr_thisblock['total_samples'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 6));
$offset += 6;
$thisfile_ofr_thisblock['raw']['sample_type'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 1));
$thisfile_ofr_thisblock['sample_type'] = $this->OptimFROGsampleTypeLookup($thisfile_ofr_thisblock['raw']['sample_type']);
$offset += 1;
$thisfile_ofr_thisblock['channel_config'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 1));
$thisfile_ofr_thisblock['channels'] = $thisfile_ofr_thisblock['channel_config'];
$offset += 1;
$thisfile_ofr_thisblock['sample_rate'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 4));
$offset += 4;
if ($BlockSize > 12) {
// OFR 4.504b or higher
$thisfile_ofr_thisblock['channels'] = $this->OptimFROGchannelConfigNumChannelsLookup($thisfile_ofr_thisblock['channel_config']);
$thisfile_ofr_thisblock['raw']['encoder_id'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 2));
$thisfile_ofr_thisblock['encoder'] = $this->OptimFROGencoderNameLookup($thisfile_ofr_thisblock['raw']['encoder_id']);
$offset += 2;
$thisfile_ofr_thisblock['raw']['compression'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 1));
$thisfile_ofr_thisblock['compression'] = $this->OptimFROGcompressionLookup($thisfile_ofr_thisblock['raw']['compression']);
$thisfile_ofr_thisblock['speedup'] = $this->OptimFROGspeedupLookup($thisfile_ofr_thisblock['raw']['compression']);
$offset += 1;
$info['audio']['encoder'] = 'OptimFROG ' . $thisfile_ofr_thisblock['encoder'];
$info['audio']['encoder_options'] = '--mode ' . $thisfile_ofr_thisblock['compression'];
if (($thisfile_ofr_thisblock['raw']['encoder_id'] & 0xf0) >> 4 == 7) {
// v4.507
if (strtolower(Utils::fileextension($info['filename'])) == 'ofs') {
// OptimFROG DualStream format is lossy, but as of v4.507 there is no way to tell the difference
// between lossless and lossy other than the file extension.
$info['audio']['dataformat'] = 'ofs';
$info['audio']['lossless'] = true;
}
}
}
$info['audio']['channels'] = $thisfile_ofr_thisblock['channels'];
$info['audio']['sample_rate'] = $thisfile_ofr_thisblock['sample_rate'];
$info['audio']['bits_per_sample'] = $this->OptimFROGbitsPerSampleTypeLookup($thisfile_ofr_thisblock['raw']['sample_type']);
break;
case 'COMP':
// unlike other block types, there CAN be multiple COMP blocks
$COMPdata['offset'] = $BlockOffset;
$COMPdata['size'] = $BlockSize;
if ($info['avdataoffset'] == 0) {
$info['avdataoffset'] = $BlockOffset;
}
// Only interested in first 14 bytes (only first 12 needed for v4.50 alpha), not actual audio data
$BlockData .= $this->fread(14);
$this->fseek($BlockSize - 14, SEEK_CUR);
$COMPdata['crc_32'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 4));
$offset += 4;
$COMPdata['sample_count'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 4));
$offset += 4;
$COMPdata['raw']['sample_type'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 1));
$COMPdata['sample_type'] = $this->OptimFROGsampleTypeLookup($COMPdata['raw']['sample_type']);
$offset += 1;
$COMPdata['raw']['channel_configuration'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 1));
$COMPdata['channel_configuration'] = $this->OptimFROGchannelConfigurationLookup($COMPdata['raw']['channel_configuration']);
$offset += 1;
$COMPdata['raw']['algorithm_id'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 2));
//$COMPdata['algorithm'] = OptimFROGalgorithmNameLookup($COMPdata['raw']['algorithm_id']);
$offset += 2;
if ($info['ofr']['OFR ']['size'] > 12) {
// OFR 4.504b or higher
$COMPdata['raw']['encoder_id'] = Utils::LittleEndian2Int(substr($BlockData, $offset, 2));
$COMPdata['encoder'] = $this->OptimFROGencoderNameLookup($COMPdata['raw']['encoder_id']);
$offset += 2;
}
if ($COMPdata['crc_32'] == 0x454e4f4e) {
// ASCII value of 'NONE' - placeholder value in v4.50a
$COMPdata['crc_32'] = false;
}
$thisfile_ofr_thisblock[] = $COMPdata;
break;
case 'HEAD':
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
$RIFFdata .= $this->fread($BlockSize);
break;
case 'TAIL':
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
if ($BlockSize > 0) {
$RIFFdata .= $this->fread($BlockSize);
}
break;
case 'RECV':
// block contains no useful meta data - simply note and skip
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
$this->fseek($BlockSize, SEEK_CUR);
break;
case 'APET':
// APEtag v2
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
$info['warning'][] = 'APEtag processing inside OptimFROG not supported in this version (' . $this->getid3->version() . ') of getID3()';
$this->fseek($BlockSize, SEEK_CUR);
break;
case 'MD5 ':
// APEtag v2
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
if ($BlockSize == 16) {
$thisfile_ofr_thisblock['md5_binary'] = $this->fread($BlockSize);
$thisfile_ofr_thisblock['md5_string'] = Utils::PrintHexBytes($thisfile_ofr_thisblock['md5_binary'], true, false, false);
$info['md5_data_source'] = $thisfile_ofr_thisblock['md5_string'];
} else {
$info['warning'][] = 'Expecting block size of 16 in "MD5 " chunk, found ' . $BlockSize . ' instead';
$this->fseek($BlockSize, SEEK_CUR);
}
break;
default:
$thisfile_ofr_thisblock['offset'] = $BlockOffset;
$thisfile_ofr_thisblock['size'] = $BlockSize;
$info['warning'][] = 'Unhandled OptimFROG block type "' . $BlockName . '" at offset ' . $thisfile_ofr_thisblock['offset'];
$this->fseek($BlockSize, SEEK_CUR);
break;
}
}
if (isset($info['ofr']['TAIL']['offset'])) {
$info['avdataend'] = $info['ofr']['TAIL']['offset'];
}
$info['playtime_seconds'] = (double) $info['ofr']['OFR ']['total_samples'] / ($info['audio']['channels'] * $info['audio']['sample_rate']);
$info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
// move the data chunk after all other chunks (if any)
// so that the RIFF parser doesn't see EOF when trying
// to skip over the data chunk
$RIFFdata = substr($RIFFdata, 0, 36) . substr($RIFFdata, 44) . substr($RIFFdata, 36, 8);
$getid3_temp = new GetID3();
$getid3_temp->openfile($this->getid3->filename);
$getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
$getid3_temp->info['avdataend'] = $info['avdataend'];
$getid3_riff = new Riff($getid3_temp);
$getid3_riff->ParseRIFFdata($RIFFdata);
$info['riff'] = $getid3_temp->info['riff'];
unset($getid3_riff, $getid3_temp, $RIFFdata);
return true;
}
