vendor/getid3/module.audio.voc.php

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<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at https://github.com/JamesHeinrich/getID3       //
//            or https://www.getid3.org                        //
//            or http://getid3.sourceforge.net                 //
//  see readme.txt for more details                            //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio.voc.php                                        //
// module for analyzing Creative VOC Audio files               //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}

class getid3_voc extends getid3_handler
{
	/**
	 * @return bool
	 */
	public function Analyze() {
		$info = &$this->getid3->info;

		$OriginalAVdataOffset = $info['avdataoffset'];
		$this->fseek($info['avdataoffset']);
		$VOCheader  = $this->fread(26);

		$magic = 'Creative Voice File';
		if (substr($VOCheader, 0, 19) != $magic) {
			$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($VOCheader, 0, 19)).'"');
			return false;
		}

		// shortcuts
		$thisfile_audio = &$info['audio'];
		$info['voc'] = array();
		$thisfile_voc        = &$info['voc'];

		$info['fileformat']        = 'voc';
		$thisfile_audio['dataformat']      = 'voc';
		$thisfile_audio['bitrate_mode']    = 'cbr';
		$thisfile_audio['lossless']        = true;
		$thisfile_audio['channels']        = 1; // might be overriden below
		$thisfile_audio['bits_per_sample'] = 8; // might be overriden below

		// byte #     Description
		// ------     ------------------------------------------
		// 00-12      'Creative Voice File'
		// 13         1A (eof to abort printing of file)
		// 14-15      Offset of first datablock in .voc file (std 1A 00 in Intel Notation)
		// 16-17      Version number (minor,major) (VOC-HDR puts 0A 01)
		// 18-19      2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11)

		$thisfile_voc['header']['datablock_offset'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 20, 2));
		$thisfile_voc['header']['minor_version']    = getid3_lib::LittleEndian2Int(substr($VOCheader, 22, 1));