Add Zend_Media_Id3v2 class proposal

git-svn-id: http://php-reader.googlecode.com/svn/branches/zend@153 51a70ab9-7547-0410-9469-37e369ee0574

src/Zend/Media/Id3/Frame/Poss.php

@@ -0,0 +1,129 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Media
+ * @subpackage ID3
+ * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com) 
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id$
+ */
+
+/**#@+ @ignore */
+require_once 'Zend/Media/Id3/Frame.php';
+require_once 'Zend/Media/Id3/Timing.php';
+/**#@-*/
+
+/**
+ * The <i>Position synchronisation frame</i> delivers information to the
+ * listener of how far into the audio stream he picked up; in effect, it states
+ * the time offset from the first frame in the stream. There may only be one
+ * POSS frame in each tag.
+ *
+ * @category   Zend
+ * @package    Zend_Media
+ * @subpackage ID3
+ * @author     Sven Vollbehr <sven@vollbehr.eu>
+ * @author     Ryan Butterfield <buttza@gmail.com>
+ * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com) 
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id$
+ */
+final class Zend_Media_Id3_Frame_Poss extends Zend_Media_Id3_Frame
+    implements Zend_Media_Id3_Timing
+{
+    /** @var integer */
+    private $_format = Zend_Media_Id3_Timing::MPEG_FRAMES;
+
+    /** @var integer */
+    private $_position;
+
+    /**
+     * Constructs the class with given parameters and parses object related
+     * data.
+     *
+     * @param Zend_Io_Reader $reader The reader object.
+     * @param Array $options The options array.
+     */
+    public function __construct($reader = null, &$options = array())
+    {
+        parent::__construct($reader, $options);
+
+        if ($this->_reader === null) {
+            return;
+        }
+
+        $this->_format = $this->_reader->readUInt8();
+        $this->_position = $this->_reader->readUInt32BE();
+    }
+
+    /**
+     * Returns the timing format.
+     *
+     * @return integer
+     */
+    public function getFormat() 
+    {
+        return $this->_format; 
+    }
+
+    /**
+     * Sets the timing format.
+     *
+     * @see Zend_Media_Id3_Timing
+     * @param integer $format The timing format.
+     */
+    public function setFormat($format) 
+    {
+        $this->_format = $format; 
+    }
+
+    /**
+     * Returns the position where in the audio the listener starts to receive,
+     * i.e. the beginning of the next frame.
+     *
+     * @return integer
+     */
+    public function getPosition() 
+    {
+        return $this->_position; 
+    }
+
+    /**
+     * Sets the position where in the audio the listener starts to receive,
+     * i.e. the beginning of the next frame, using given format.
+     *
+     * @param integer $position The position.
+     * @param integer $format The timing format.
+     */
+    public function setPosition($position, $format = null)
+    {
+        $this->_position = $position;
+        if ($format !== null) {
+            $this->setFormat($format);
+        }
+    }
+
+    /**
+     * Writes the frame raw data without the header.
+     *
+     * @param Zend_Io_Writer $writer The writer object.
+     * @return void
+     */
+    protected function _writeFrame($writer)
+    {
+        $writer->writeUInt8($this->_format)
+               ->writeUInt32BE($this->_position);
+    }
+}