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Current File : /home/uneseuleoc/www/plugins-dist/medias/lib/getid3/module.audio.voc.php
<?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));
		$thisfile_voc['header']['major_version']    = getid3_lib::LittleEndian2Int(substr($VOCheader, 23, 1));
		$thisfile_voc['blocktypes']                 = array();

		do {

			$BlockOffset    = $this->ftell();
			$BlockData      = $this->fread(4);
			$BlockType      = ord($BlockData[0]);
			$BlockSize      = getid3_lib::LittleEndian2Int(substr($BlockData, 1, 3));
			$ThisBlock      = array();

			/** @phpstan-ignore-next-line */
			getid3_lib::safe_inc($thisfile_voc['blocktypes'][$BlockType], 1);
			switch ($BlockType) {
				case 0:  // Terminator
					// do nothing, we'll break out of the loop down below
					break;

				case 1:  // Sound data
					$BlockData .= $this->fread(2);
					if ($info['avdataoffset'] <= $OriginalAVdataOffset) {
						$info['avdataoffset'] = $this->ftell();
					}
					$this->fseek($BlockSize - 2, SEEK_CUR);

					$ThisBlock['sample_rate_id']   = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 1));
					$ThisBlock['compression_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, 5, 1));

					$ThisBlock['compression_name'] = $this->VOCcompressionTypeLookup($ThisBlock['compression_type']);
					if ($ThisBlock['compression_type'] <= 3) {
						$thisfile_voc['compressed_bits_per_sample'] = getid3_lib::CastAsInt(str_replace('-bit', '', $ThisBlock['compression_name']));
					}

					// Less accurate sample_rate calculation than the Extended block (#8) data (but better than nothing if Extended Block is not available)
					if (empty($thisfile_audio['sample_rate'])) {
						// SR byte = 256 - (1000000 / sample_rate)
						$thisfile_audio['sample_rate'] = getid3_lib::trunc((1000000 / (256 - $ThisBlock['sample_rate_id'])) / $thisfile_audio['channels']);
					}
					break;

				case 2:  // Sound continue
				case 3:  // Silence
				case 4:  // Marker
				case 6:  // Repeat
				case 7:  // End repeat
					// nothing useful, just skip
					$this->fseek($BlockSize, SEEK_CUR);
					break;

				case 8:  // Extended
					$BlockData .= $this->fread(4);

					//00-01  Time Constant:
					//   Mono: 65536 - (256000000 / sample_rate)
					// Stereo: 65536 - (256000000 / (sample_rate * 2))
					$ThisBlock['time_constant'] =        getid3_lib::LittleEndian2Int(substr($BlockData, 4, 2));
					$ThisBlock['pack_method']   =        getid3_lib::LittleEndian2Int(substr($BlockData, 6, 1));
					$ThisBlock['stereo']        = (bool) getid3_lib::LittleEndian2Int(substr($BlockData, 7, 1));

					$thisfile_audio['channels']    = ($ThisBlock['stereo'] ? 2 : 1);
					$thisfile_audio['sample_rate'] = getid3_lib::trunc((256000000 / (65536 - $ThisBlock['time_constant'])) / $thisfile_audio['channels']);
					break;

				case 9:  // data block that supersedes blocks 1 and 8. Used for stereo, 16 bit
					$BlockData .= $this->fread(12);
					if ($info['avdataoffset'] <= $OriginalAVdataOffset) {
						$info['avdataoffset'] = $this->ftell();
					}
					$this->fseek($BlockSize - 12, SEEK_CUR);

					$ThisBlock['sample_rate']      = getid3_lib::LittleEndian2Int(substr($BlockData,  4, 4));
					$ThisBlock['bits_per_sample']  = getid3_lib::LittleEndian2Int(substr($BlockData,  8, 1));
					$ThisBlock['channels']         = getid3_lib::LittleEndian2Int(substr($BlockData,  9, 1));
					$ThisBlock['wFormat']          = getid3_lib::LittleEndian2Int(substr($BlockData, 10, 2));

					$ThisBlock['compression_name'] = $this->VOCwFormatLookup($ThisBlock['wFormat']);
					if ($this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat'])) {
						$thisfile_voc['compressed_bits_per_sample'] = $this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat']);
					}

					$thisfile_audio['sample_rate']     = $ThisBlock['sample_rate'];
					$thisfile_audio['bits_per_sample'] = $ThisBlock['bits_per_sample'];
					$thisfile_audio['channels']        = $ThisBlock['channels'];
					break;

				default:
					$this->warning('Unhandled block type "'.$BlockType.'" at offset '.$BlockOffset);
					$this->fseek($BlockSize, SEEK_CUR);
					break;
			}

			if (!empty($ThisBlock)) {
				$ThisBlock['block_offset']  = $BlockOffset;
				$ThisBlock['block_size']    = $BlockSize;
				$ThisBlock['block_type_id'] = $BlockType;
				$thisfile_voc['blocks'][] = $ThisBlock;
			}

		} while (!feof($this->getid3->fp) && ($BlockType != 0));

		// Terminator block doesn't have size field, so seek back 3 spaces
		$this->fseek(-3, SEEK_CUR);

		ksort($thisfile_voc['blocktypes']);

		if (!empty($thisfile_voc['compressed_bits_per_sample'])) {
			$info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / ($thisfile_voc['compressed_bits_per_sample'] * $thisfile_audio['channels'] * $thisfile_audio['sample_rate']);
			$thisfile_audio['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
		}

		return true;
	}

	/**
	 * @param int $index
	 *
	 * @return string
	 */
	public function VOCcompressionTypeLookup($index) {
		static $VOCcompressionTypeLookup = array(
			0 => '8-bit',
			1 => '4-bit',
			2 => '2.6-bit',
			3 => '2-bit'
		);
		return (isset($VOCcompressionTypeLookup[$index]) ? $VOCcompressionTypeLookup[$index] : 'Multi DAC ('.($index - 3).') channels');
	}

	/**
	 * @param int $index
	 *
	 * @return string|false
	 */
	public function VOCwFormatLookup($index) {
		static $VOCwFormatLookup = array(
			0x0000 => '8-bit unsigned PCM',
			0x0001 => 'Creative 8-bit to 4-bit ADPCM',
			0x0002 => 'Creative 8-bit to 3-bit ADPCM',
			0x0003 => 'Creative 8-bit to 2-bit ADPCM',
			0x0004 => '16-bit signed PCM',
			0x0006 => 'CCITT a-Law',
			0x0007 => 'CCITT u-Law',
			0x2000 => 'Creative 16-bit to 4-bit ADPCM'
		);
		return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false);
	}

	/**
	 * @param int $index
	 *
	 * @return int|false
	 */
	public function VOCwFormatActualBitsPerSampleLookup($index) {
		static $VOCwFormatLookup = array(
			0x0000 =>  8,
			0x0001 =>  4,
			0x0002 =>  3,
			0x0003 =>  2,
			0x0004 => 16,
			0x0006 =>  8,
			0x0007 =>  8,
			0x2000 =>  4
		);
		return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false);
	}

}

Youez - 2016 - github.com/yon3zu
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