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Support for decoding and encoding frames with unsynchronisation schema (ID3v2.4 only)

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git-svn-id: http://php-reader.googlecode.com/svn/trunk@107 51a70ab9-7547-0410-9469-37e369ee0574
This commit is contained in:
svollbehr
2008-08-03 19:09:16 +00:00
parent 809bf58885
commit 741de5a2ab
10 changed files with 221 additions and 93 deletions
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51
src/ID3/Frame.php
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@@ -43,7 +43,7 @@ require_once("ID3/Object.php");
* A base class for all ID3v2 frames as described in the
* {@link http://www.id3.org/id3v2.4.0-frames ID3v2 frames document}.
*
*
*
* @package php-reader
* @subpackage ID3
* @author Sven Vollbehr <svollbehr@gmail.com>
@@ -128,11 +128,11 @@ class ID3_Frame extends ID3_Object
/**
* Raw content of the frame.
*
*
* @var string
*/
protected $_data = "";
/**
* Constructs the class with given parameters and reads object related data
* from the ID3v2 tag.
@@ -144,15 +144,15 @@ class ID3_Frame extends ID3_Object
public function __construct($reader = null, &$options = array())
{
parent::__construct($reader, $options);
if ($reader === null) {
$this->_identifier = substr(get_class($this), -4);
} else {
$this->_identifier = $this->_reader->readString8(4);
$this->_size = $this->decodeSynchsafe32($this->_reader->readUInt32BE());
/* ID3v2.3.0 Flags; convert to 2.4.0 format */
/* ID3v2.3.0 size and flags; convert flags to 2.4.0 format */
if ($this->getOption("version", 4) < 4) {
$this->_size = $this->_reader->readUInt32BE();
$flags = $this->_reader->readUInt16BE();
if (($flags & 0x8000) == 0x8000)
$this->_flags |= self::DISCARD_ON_TAGCHANGE;
@@ -168,14 +168,26 @@ class ID3_Frame extends ID3_Object
$this->_flags |= self::GROUPING_IDENTITY;
}
/* ID3v2.4.0 Flags */
else
/* ID3v2.4.0 size and flags */
else {
$this->_size = $this->decodeSynchsafe32($this->_reader->readUInt32BE());
$this->_flags = $this->_reader->readUInt16BE();
}
$dataLength = $this->_size;
if ($this->hasFlag(self::DATA_LENGTH_INDICATOR)) {
$dataLength = $this->decodeSynchsafe32($this->_reader->readUInt32BE());
$this->_size -= 4;
}
$this->_data = $this->_reader->read($this->_size);
$this->_size = $dataLength;
if ($this->hasFlag(self::UNSYNCHRONISATION) ||
$this->getOption("unsyncronisation", false) === true)
$this->_data = $this->decodeUnsynchronisation($this->_data);
}
}
/**
* Returns the frame identifier string.
*
@@ -227,14 +239,14 @@ class ID3_Frame extends ID3_Object
/**
* Sets the frame raw data.
*
* @return string
* @param string $data
*/
protected function setData($data)
{
$this->_data = $data;
$this->_size = strlen($data);
}
/**
* Returns the frame raw data.
*
@@ -263,8 +275,21 @@ class ID3_Frame extends ID3_Object
else
$flags = $this->_flags;
$size = $this->_size;
if ($this->getOption("version", 4) < 4)
$data = $this->_data;
else {
$data = $this->encodeUnsynchronisation($this->_data);
if (($dataLength = strlen($data)) != $size) {
$size = 4 + $dataLength;
$data = Transform::toUInt32BE($this->encodeSynchsafe32($this->_size)) .
$data;
$flags |= self::DATA_LENGTH_INDICATOR | self::UNSYNCHRONISATION;
$this->setOption("unsyncronisation", true);
}
}
return Transform::toString8(substr($this->_identifier, 0, 4), 4) .
Transform::toUInt32BE($this->encodeSynchsafe32($this->_size)) .
Transform::toUInt16BE($flags) . $this->_data;
Transform::toUInt32BE($this->encodeSynchsafe32($size)) .
Transform::toUInt16BE($flags) . $data;
}
}