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<?php |
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/** |
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* This file is part of the Metadata package. |
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* |
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* @author Daniel Schröder <[email protected]> |
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*/ |
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namespace GravityMedia\Metadata\ID3v2\Metadata; |
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use GravityMedia\Metadata\ID3v2\Filter\SynchsafeIntegerFilter; |
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use GravityMedia\Metadata\ID3v2\Flag\ExtendedHeaderFlag; |
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use GravityMedia\Metadata\ID3v2\Version; |
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use GravityMedia\Stream\Stream; |
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/** |
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* ID3v2 extended header metadata class. |
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* |
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* @package GravityMedia\Metadata\ID3v2\Metadata |
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*/ |
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class ExtendedHeaderMetadata |
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{ |
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/** |
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* @var Stream |
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*/ |
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protected $stream; |
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/** |
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* @var int |
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*/ |
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protected $version; |
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/** |
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* @var SynchsafeIntegerFilter |
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*/ |
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protected $synchsafeIntegerFilter; |
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/** |
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* Create ID3v2 extended header metadata object. |
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* |
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* @param Stream $stream |
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* @param int $version |
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*/ |
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public function __construct(Stream $stream, $version) |
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{ |
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$this->stream = $stream; |
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$this->version = $version; |
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$this->synchsafeIntegerFilter = new SynchsafeIntegerFilter(); |
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} |
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/** |
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* Read ID3v2 extended header size. |
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* |
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* @return int |
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*/ |
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public function readSize() |
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{ |
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if (Version::VERSION_23 === $this->version) { |
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return $this->stream->readUInt32(); |
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} |
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return $this->synchsafeIntegerFilter->decode($this->stream->readUInt32()); |
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} |
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/** |
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* Read ID3v2 extended header flags. |
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* |
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* @return array |
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*/ |
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public function readFlags() |
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{ |
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if (Version::VERSION_23 === $this->version) { |
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$flags = $this->stream->readUInt16(); |
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return [ |
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ExtendedHeaderFlag::FLAG_CRC_DATA_PRESENT => (bool)($flags & 0x8000) |
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]; |
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} |
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$this->stream->seek(1, SEEK_CUR); |
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$flags = $this->stream->readUInt8(); |
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return [ |
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ExtendedHeaderFlag::FLAG_TAG_IS_AN_UPDATE => (bool)($flags & 0x40), |
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ExtendedHeaderFlag::FLAG_CRC_DATA_PRESENT => (bool)($flags & 0x20), |
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ExtendedHeaderFlag::FLAG_TAG_RESTRICTIONS => (bool)($flags & 0x10) |
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]; |
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} |
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/** |
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* Read ID3v2 extended header padding. |
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* |
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* @return int |
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*/ |
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public function readPadding() |
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{ |
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return $this->stream->readUInt32(); |
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} |
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/** |
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* Read ID3v2 extended header CRC-32 data. |
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* |
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* @return int |
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*/ |
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public function readCrc32() |
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{ |
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if (Version::VERSION_23 === $this->version) { |
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return $this->stream->readUInt32(); |
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} |
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$this->stream->seek(1, SEEK_CUR); |
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return $this->stream->readUInt8() * 0x10000000 + |
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$this->synchsafeIntegerFilter->decode($this->stream->readUInt32()); |
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} |
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/** |
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* Read ID3v2 extended header restrictions. |
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* |
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* @return int |
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*/ |
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public function readRestrictions() |
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{ |
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$this->stream->seek(1, SEEK_CUR); |
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return $this->stream->readUInt8(); |
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} |
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} |
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GravityMedia /
Metadata
