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<?php |
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/** |
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* This file is part of the Metadata project. |
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* |
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* @author Daniel Schröder <[email protected]> |
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*/ |
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namespace GravityMedia\Metadata\ID3v1\Writer; |
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use GravityMedia\Metadata\ID3v1\Enum\Version; |
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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\StreamInterface; |
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/** |
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* ID3v1 tag writer. |
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* |
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* @package GravityMedia\Metadata\ID3v1\Writer |
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*/ |
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class TagWriter |
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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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* Create ID3v1 tag writer object. |
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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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* Pad data. |
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* |
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* @param string $data The data to pad |
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* @param int $length The final length |
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* @param int $type The type of padding |
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* |
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* @return string |
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*/ |
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protected function padData($data, $length, $type) |
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{ |
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return str_pad(trim(substr($data, 0, $length)), $length, "\x00", $type); |
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} |
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/** |
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* Write ID3v1 tag. |
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* |
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* @param TagInterface $tag |
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* |
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* @return $this |
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*/ |
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public function write(TagInterface $tag) |
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{ |
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$offset = 0; |
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if ($this->metadata->exists()) { |
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$offset = -128; |
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} |
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$this->stream->seek($offset, SEEK_END); |
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$data = 'TAG'; |
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$data .= $this->padData($tag->getTitle(), 30, STR_PAD_RIGHT); |
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$data .= $this->padData($tag->getArtist(), 30, STR_PAD_RIGHT); |
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$data .= $this->padData($tag->getAlbum(), 30, STR_PAD_RIGHT); |
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$data .= $this->padData($tag->getYear(), 4, STR_PAD_LEFT); |
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if (Version::VERSION_11 === $tag->getVersion()) { |
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$data .= $this->padData($tag->getComment(), 28, STR_PAD_RIGHT); |
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$data .= "\x00"; |
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$data .= chr($tag->getTrack()); |
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} else { |
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$data .= $this->padData($tag->getComment(), 30, STR_PAD_RIGHT); |
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} |
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$data .= chr($tag->getGenre()); |
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$this->stream->write($data); |
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return $this; |
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} |
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} |
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GravityMedia /
Metadata
