<?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.optimfrog.php                                  //
// module for analyzing OptimFROG audio files                  //
// dependencies: module.audio.riff.php                         //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);

class getid3_optimfrog extends getid3_handler
{
	/**
	 * @return bool
	 */
	public function Analyze() {
		$info = &$this->getid3->info;

		$info['fileformat']            = 'ofr';
		$info['audio']['dataformat']   = 'ofr';
		$info['audio']['bitrate_mode'] = 'vbr';
		$info['audio']['lossless']     = true;

		$this->fseek($info['avdataoffset']);
		$OFRheader  = $this->fread(8);
		if (substr($OFRheader, 0, 5) == '*RIFF') {

			return $this->ParseOptimFROGheader42();

		} elseif (substr($OFRheader, 0, 3) == 'OFR') {

			return $this->ParseOptimFROGheader45();

		}

		$this->error('Expecting "*RIFF" or "OFR " at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($OFRheader).'"');
		unset($info['fileformat']);
		return false;
	}

	/**
	 * @return bool
	 */
	public function ParseOptimFROGheader42() {
		// for fileformat of v4.21 and older

		$info = &$this->getid3->info;
		$this->fseek($info['avdataoffset']);
		$OptimFROGheaderData = $this->fread(45);
		$info['avdataoffset'] = 45;

		$OptimFROGencoderVersion_raw   = getid3_lib::LittleEndian2Int(substr($OptimFROGheaderData, 0, 1));
		$OptimFROGencoderVersion_major = floor($OptimFROGencoderVersion_raw / 10);
		$OptimFROGencoderVersion_minor = $OptimFROGencoderVersion_raw - ($OptimFROGencoderVersion_major * 10);
		$RIFFdata                = substr($OptimFROGheaderData, 1, 44);
		$OrignalRIFFheaderSize   = getid3_lib::LittleEndian2Int(substr($RIFFdata,  4, 4)) +  8;
		$OrignalRIFFdataSize     = getid3_lib::LittleEndian2Int(substr($RIFFdata, 40, 4)) + 44;

		if ($OrignalRIFFheaderSize > $OrignalRIFFdataSize) {
			$info['avdataend'] -= ($OrignalRIFFheaderSize - $OrignalRIFFdataSize);
			$this->fseek($info['avdataend']);
			$RIFFdata .= $this->fread($OrignalRIFFheaderSize - $OrignalRIFFdataSize);
		}

		// 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, $this->getid3->info['filesize'], $this->getid3->fp);
		$getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
		$getid3_temp->info['avdataend']    = $info['avdataend'];
		$getid3_riff = new getid3_riff($getid3_temp);
		$getid3_riff->ParseRIFFdata($RIFFdata);
		$info['riff'] = $getid3_temp->info['riff'];

		$info['audio']['encoder']         = 'OptimFROG '.$OptimFROGencoderVersion_major.'.'.$OptimFROGencoderVersion_minor;
		$info['audio']['channels']        = $info['riff']['audio'][0]['channels'];
		$info['audio']['sample_rate']     = $info['riff']['audio'][0]['sample_rate'];
		$info['audio']['bits_per_sample'] = $info['riff']['audio'][0]['bits_per_sample'];
		$info['playtime_seconds']         = $OrignalRIFFdataSize / ($info['audio']['channels'] * $info['audio']['sample_rate'] * ($info['audio']['bits_per_sample'] / 8));
		$info['audio']['bitrate']         = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];

		unset($getid3_riff, $getid3_temp, $RIFFdata);

		return true;
	}

	/**
	 * @return bool
	 */
	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);
			$BlockSize   = getid3_lib::LittleEndian2Int(substr($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:
							$this->warning('"'.$BlockName.'" contains more data than expected (expected 12 or 15 bytes, found '.$BlockSize.' bytes)');
							break;
					}
					$BlockData .= $this->fread($BlockSize);

					$thisfile_ofr_thisblock['total_samples']      = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 6));
					$offset += 6;
					$thisfile_ofr_thisblock['raw']['sample_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
					$thisfile_ofr_thisblock['sample_type']        = $this->OptimFROGsampleTypeLookup($thisfile_ofr_thisblock['raw']['sample_type']);
					$offset += 1;
					$thisfile_ofr_thisblock['channel_config']     = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
					$thisfile_ofr_thisblock['channels']           = $thisfile_ofr_thisblock['channel_config'];
					$offset += 1;
					$thisfile_ofr_thisblock['sample_rate']        = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 4));
					$offset += 4;

					if ($BlockSize > 12) {

						// OFR 4.504b or higher
						$thisfile_ofr_thisblock['channels']           = $this->OptimFROGchannelConfigNumChannelsLookup($thisfile_ofr_thisblock['channel_config']);
						$thisfile_ofr_thisblock['raw']['encoder_id']  = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 2));
						$thisfile_ofr_thisblock['encoder']            = $this->OptimFROGencoderNameLookup($thisfile_ofr_thisblock['raw']['encoder_id']);
						$offset += 2;
						$thisfile_ofr_thisblock['raw']['compression'] = getid3_lib::LittleEndian2Int(substr($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 ((($thisfile_ofr_thisblock['raw']['encoder_id'] & 0xF0) >> 4) == 7) { // v4.507
							if (strtolower(getid3_lib::fileextension($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);

					$COMPdata['crc_32']                       = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 4));
					$offset += 4;
					$COMPdata['sample_count']                 = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 4));
					$offset += 4;
					$COMPdata['raw']['sample_type']           = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
					$COMPdata['sample_type']                  = $this->OptimFROGsampleTypeLookup($COMPdata['raw']['sample_type']);
					$offset += 1;
					$COMPdata['raw']['channel_configuration'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
					$COMPdata['channel_configuration']        = $this->OptimFROGchannelConfigurationLookup($COMPdata['raw']['channel_configuration']);
					$offset += 1;
					$COMPdata['raw']['algorithm_id']          = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 2));
					//$COMPdata['algorithm']                    = OptimFROGalgorithmNameLookup($COMPdata['raw']['algorithm_id']);
					$offset += 2;

					if ($info['ofr']['OFR ']['size'] > 12) {

						// OFR 4.504b or higher
						$COMPdata['raw']['encoder_id']        = getid3_lib::LittleEndian2Int(substr($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;
					$this->warning('APEtag processing inside OptimFROG not supported in this version ('.$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);
						$thisfile_ofr_thisblock['md5_string'] = getid3_lib::PrintHexBytes($thisfile_ofr_thisblock['md5_binary'], true, false, false);
						$info['md5_data_source'] = $thisfile_ofr_thisblock['md5_string'];

					} else {

						$this->warning('Expecting block size of 16 in "MD5 " chunk, found '.$BlockSize.' instead');
						$this->fseek($BlockSize, SEEK_CUR);

					}
					break;


				default:
					$thisfile_ofr_thisblock['offset'] = $BlockOffset;
					$thisfile_ofr_thisblock['size']   = $BlockSize;

					$this->warning('Unhandled OptimFROG block type "'.$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'] = (float) $info['ofr']['OFR ']['total_samples'] / ($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, $this->getid3->info['filesize'], $this->getid3->fp);
		$getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
		$getid3_temp->info['avdataend']    = $info['avdataend'];
		$getid3_riff = new getid3_riff($getid3_temp);
		$getid3_riff->ParseRIFFdata($RIFFdata);
		$info['riff'] = $getid3_temp->info['riff'];

		unset($getid3_riff, $getid3_temp, $RIFFdata);

		return true;
	}

	/**
	 * @param int $SampleType
	 *
	 * @return string|false
	 */
	public static function OptimFROGsampleTypeLookup($SampleType) {
		static $OptimFROGsampleTypeLookup = array(
			0  => 'unsigned int (8-bit)',
			1  => 'signed int (8-bit)',
			2  => 'unsigned int (16-bit)',
			3  => 'signed int (16-bit)',
			4  => 'unsigned int (24-bit)',
			5  => 'signed int (24-bit)',
			6  => 'unsigned int (32-bit)',
			7  => 'signed int (32-bit)',
			8  => 'float 0.24 (32-bit)',
			9  => 'float 16.8 (32-bit)',
			10 => 'float 24.0 (32-bit)'
		);
		return (isset($OptimFROGsampleTypeLookup[$SampleType]) ? $OptimFROGsampleTypeLookup[$SampleType] : false);
	}

	/**
	 * @param int $SampleType
	 *
	 * @return int|false
	 */
	public static function OptimFROGbitsPerSampleTypeLookup($SampleType) {
		static $OptimFROGbitsPerSampleTypeLookup = array(
			0  => 8,
			1  => 8,
			2  => 16,
			3  => 16,
			4  => 24,
			5  => 24,
			6  => 32,
			7  => 32,
			8  => 32,
			9  => 32,
			10 => 32
		);
		return (isset($OptimFROGbitsPerSampleTypeLookup[$SampleType]) ? $OptimFROGbitsPerSampleTypeLookup[$SampleType] : false);
	}

	/**
	 * @param int $ChannelConfiguration
	 *
	 * @return string|false
	 */
	public static function OptimFROGchannelConfigurationLookup($ChannelConfiguration) {
		static $OptimFROGchannelConfigurationLookup = array(
			0 => 'mono',
			1 => 'stereo'
		);
		return (isset($OptimFROGchannelConfigurationLookup[$ChannelConfiguration]) ? $OptimFROGchannelConfigurationLookup[$ChannelConfiguration] : false);
	}

	/**
	 * @param int $ChannelConfiguration
	 *
	 * @return int|false
	 */
	public static function OptimFROGchannelConfigNumChannelsLookup($ChannelConfiguration) {
		static $OptimFROGchannelConfigNumChannelsLookup = array(
			0 => 1,
			1 => 2
		);
		return (isset($OptimFROGchannelConfigNumChannelsLookup[$ChannelConfiguration]) ? $OptimFROGchannelConfigNumChannelsLookup[$ChannelConfiguration] : false);
	}


	// static function OptimFROGalgorithmNameLookup($AlgorithID) {
	//     static $OptimFROGalgorithmNameLookup = array();
	//     return (isset($OptimFROGalgorithmNameLookup[$AlgorithID]) ? $OptimFROGalgorithmNameLookup[$AlgorithID] : false);
	// }


	/**
	 * @param int $EncoderID
	 *
	 * @return string
	 */
	public static function OptimFROGencoderNameLookup($EncoderID) {
		// version = (encoderID >> 4) + 4500
		// system  =  encoderID & 0xF

		$EncoderVersion  = number_format(((($EncoderID & 0xF0) >> 4) + 4500) / 1000, 3);
		$EncoderSystemID = ($EncoderID & 0x0F);

		static $OptimFROGencoderSystemLookup = array(
			0x00 => 'Windows console',
			0x01 => 'Linux console',
			0x0F => 'unknown'
		);
		return $EncoderVersion.' ('.(isset($OptimFROGencoderSystemLookup[$EncoderSystemID]) ? $OptimFROGencoderSystemLookup[$EncoderSystemID] : 'undefined encoder type (0x'.dechex($EncoderSystemID).')').')';
	}

	/**
	 * @param int $CompressionID
	 *
	 * @return string
	 */
	public static function OptimFROGcompressionLookup($CompressionID) {
		// mode    = compression >> 3
		// speedup = compression & 0x07

		$CompressionModeID    = ($CompressionID & 0xF8) >> 3;
		//$CompressionSpeedupID = ($CompressionID & 0x07);

		static $OptimFROGencoderModeLookup = array(
			0x00 => 'fast',
			0x01 => 'normal',
			0x02 => 'high',
			0x03 => 'extra', // extranew (some versions)
			0x04 => 'best',  // bestnew (some versions)
			0x05 => 'ultra',
			0x06 => 'insane',
			0x07 => 'highnew',
			0x08 => 'extranew',
			0x09 => 'bestnew'
		);
		return (isset($OptimFROGencoderModeLookup[$CompressionModeID]) ? $OptimFROGencoderModeLookup[$CompressionModeID] : 'undefined mode (0x'.str_pad(dechex($CompressionModeID), 2, '0', STR_PAD_LEFT).')');
	}

	/**
	 * @param int $CompressionID
	 *
	 * @return string
	 */
	public static function OptimFROGspeedupLookup($CompressionID) {
		// mode    = compression >> 3
		// speedup = compression & 0x07

		//$CompressionModeID    = ($CompressionID & 0xF8) >> 3;
		$CompressionSpeedupID = ($CompressionID & 0x07);

		static $OptimFROGencoderSpeedupLookup = array(
			0x00 => '1x',
			0x01 => '2x',
			0x02 => '4x'
		);
		return (isset($OptimFROGencoderSpeedupLookup[$CompressionSpeedupID]) ? $OptimFROGencoderSpeedupLookup[$CompressionSpeedupID] : 'undefined mode (0x'.dechex($CompressionSpeedupID));
	}

}
