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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\Reader; |
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use GravityMedia\Metadata\ID3v2\Encoder\Unsynchronisation; |
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use GravityMedia\Metadata\ID3v2\Enum\HeaderFlag; |
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use GravityMedia\Metadata\ID3v2\Tag; |
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use GravityMedia\Metadata\Metadata\HeaderInterface; |
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use GravityMedia\Metadata\Metadata\MetadataInterface; |
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use GravityMedia\Metadata\Metadata\TagInterface; |
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use GravityMedia\Stream\Stream; |
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use GravityMedia\Stream\StreamInterface; |
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/** |
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* ID3v2 tag reader. |
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* |
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* @package GravityMedia\Metadata\ID3v2\Reader |
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*/ |
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class TagReader |
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{ |
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/** |
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* @var MetadataInterface |
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*/ |
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protected $metadata; |
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/** |
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* @var StreamInterface |
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*/ |
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protected $stream; |
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/** |
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* @var HeaderReader |
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*/ |
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protected $headerReader; |
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/** |
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* Create ID3v2 tag reader. |
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* |
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* @param MetadataInterface $metadata |
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* @param StreamInterface $stream |
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*/ |
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public function __construct(MetadataInterface $metadata, StreamInterface $stream) |
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{ |
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$this->metadata = $metadata; |
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$this->stream = $stream; |
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} |
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/** |
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* Get header reader. |
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* |
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* @return HeaderReader |
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*/ |
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public function getHeaderReader() |
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{ |
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if (null === $this->headerReader) { |
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$this->headerReader = new HeaderReader($this->stream); |
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} |
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return $this->headerReader; |
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} |
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/** |
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* Read data. |
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* |
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* @param HeaderInterface $header |
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* |
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* @return string |
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*/ |
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protected function readData(HeaderInterface $header) |
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{ |
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$this->stream->seek(10); |
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$data = $this->stream->read($header->getSize()); |
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if ($header->isFlagEnabled(HeaderFlag::FLAG_COMPRESSION)) { |
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$data = gzuncompress($data); |
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} |
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if ($header->isFlagEnabled(HeaderFlag::FLAG_UNSYNCHRONISATION)) { |
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$data = Unsynchronisation::decode($data); |
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} |
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return $data; |
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} |
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/** |
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* Create data stream. |
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* |
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* @param string $data |
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* |
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* @return StreamInterface |
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*/ |
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protected function createDataStream($data) |
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{ |
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$resource = fopen('php://temp', 'r+b'); |
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$stream = Stream::fromResource($resource); |
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$stream->write($data); |
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$stream->rewind(); |
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return $stream; |
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} |
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/** |
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* Read ID3v2 tag. |
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* |
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* @return null|TagInterface |
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*/ |
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public function read() |
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{ |
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if (!$this->metadata->exists()) { |
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return null; |
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} |
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$header = $this->getHeaderReader()->read(); |
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$stream = $this->createDataStream($this->readData($header)); |
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$tag = new Tag($header); |
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$size = $stream->getSize(); |
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if ($header->isFlagEnabled(HeaderFlag::FLAG_EXTENDED_HEADER)) { |
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$extendedHeaderReader = new ExtendedHeaderReader($stream, $header); |
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$extendedHeader = $extendedHeaderReader->read(); |
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$tag->setExtendedHeader($extendedHeader); |
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$size -= $extendedHeader->getSize(); |
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} |
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if ($header->isFlagEnabled(HeaderFlag::FLAG_EXTENDED_HEADER)) { |
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// TODO: Read footer from stream |
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$size -= 10; |
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} |
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$frameReader = new FrameReader($stream, $header); |
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while ($size > 0) { |
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$frame = $frameReader->read(); |
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if (0 === $frame->getSize()) { |
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break; |
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} |
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$tag->addFrame($frame); |
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$size -= $frame->getSize(); |
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} |
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return $tag; |
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} |
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} |
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GravityMedia /
Metadata
