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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\FrameFlag; |
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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 frame metadata class. |
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* |
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* @package GravityMedia\Metadata\ID3v2\Metadata |
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*/ |
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class FrameMetadata |
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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 frame 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 frame name. |
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* |
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* @return string |
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*/ |
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public function readName() |
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{ |
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if (Version::VERSION_22 === $this->version) { |
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return rtrim($this->stream->read(3)); |
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} |
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return rtrim($this->stream->read(4)); |
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} |
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/** |
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* Read ID3v2 frame 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_22 === $this->version) { |
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return $this->stream->readUInt24(); |
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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 frame 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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$flags = $this->stream->readUInt16(); |
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if (Version::VERSION_23 === $this->version) { |
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return [ |
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FrameFlag::FLAG_TAG_ALTER_PRESERVATION => (bool)($flags & 0x8000), |
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FrameFlag::FLAG_FILE_ALTER_PRESERVATION => (bool)($flags & 0x4000), |
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FrameFlag::FLAG_READ_ONLY => (bool)($flags & 0x2000), |
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FrameFlag::FLAG_COMPRESSION => (bool)($flags & 0x0080), |
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FrameFlag::FLAG_ENCRYPTION => (bool)($flags & 0x0040), |
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FrameFlag::FLAG_GROUPING_IDENTITY => (bool)($flags & 0x0020), |
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]; |
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} |
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return [ |
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FrameFlag::FLAG_TAG_ALTER_PRESERVATION => (bool)($flags & 0x4000), |
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FrameFlag::FLAG_FILE_ALTER_PRESERVATION => (bool)($flags & 0x2000), |
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FrameFlag::FLAG_READ_ONLY => (bool)($flags & 0x1000), |
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FrameFlag::FLAG_GROUPING_IDENTITY => (bool)($flags & 0x0040), |
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FrameFlag::FLAG_COMPRESSION => (bool)($flags & 0x0008), |
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FrameFlag::FLAG_ENCRYPTION => (bool)($flags & 0x0004), |
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FrameFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x0002), |
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FrameFlag::FLAG_DATA_LENGT_INDICATOR => (bool)($flags & 0x0001), |
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]; |
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} |
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/** |
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* Read ID3v2 frame data length. |
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* |
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* @return int |
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*/ |
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public function readDataLength() |
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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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GravityMedia /
Metadata
