Add Zend_Media_Mpeg class proposal

git-svn-id: http://php-reader.googlecode.com/svn/branches/zend@172 51a70ab9-7547-0410-9469-37e369ee0574
2010-03-06 22:08:24 +00:00
parent 7fc09e5964
commit 308466cbad
24 changed files with 2656 additions and 3483 deletions
--- a/src/Zend/Media/Mpeg/Abs/XingHeader.php
+++ b/src/Zend/Media/Mpeg/Abs/XingHeader.php
@@ -0,0 +1,138 @@
+<?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 MPEG
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) 
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id$
+ */
+
+/**#@+ @ignore */
+require_once 'Reader.php';
+require_once 'Zend/Bit/Twiddling.php';
+require_once 'Zend/Media/Mpeg/Abs/Object.php';
+/**#@-*/
+
+/**
+ * This class represents the Xing VBR header which is often found in the first
+ * frame of an MPEG Audio Bit Stream.
+ *
+ * @category   Zend
+ * @package    Zend_Media
+ * @subpackage MPEG
+ * @author     Ryan Butterfield <buttza@gmail.com>
+ * @author     Sven Vollbehr <sven@vollbehr.eu>
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) 
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id$
+ */
+class Zend_Media_Mpeg_Abs_XingHeader extends Zend_Media_Mpeg_Abs_Object
+{
+    /** @var integer */
+    private $_frames = false;
+
+    /** @var integer */
+    private $_bytes = false;
+
+    /** @var Array */
+    private $_toc = array();
+
+    /** @var integer */
+    private $_qualityIndicator = false;
+
+    /**
+     * Constructs the class with given parameters and reads object related data
+     * from the bitstream.
+     *
+     * @param Zend_Io_Reader $reader The reader object.
+     * @param Array $options Array of options.
+     */
+    public function __construct($reader, &$options = array())
+    {
+        parent::__construct($reader, $options);
+
+        $flags = $reader->readUInt32BE();
+
+        if (Zend_Bit_Twiddling::testAnyBits($flags, 0x1)) {
+            $this->_frames = $this->_reader->readUInt32BE();
+        }
+        if (Zend_Bit_Twiddling::testAnyBits($flags, 0x2)) {
+            $this->_bytes = $this->_reader->readUInt32BE();
+        }
+        if (Zend_Bit_Twiddling::testAnyBits($flags, 0x4)) {
+            $this->_toc = array_merge(unpack('C*', $this->_reader->read(100)));
+        }
+        if (Zend_Bit_Twiddling::testAnyBits($flags, 0x8)) {
+            $this->_qualityIndicator = $this->_reader->readUInt32BE();
+        }
+    }
+
+    /**
+     * Returns the number of frames in the file.
+     *
+     * @return integer
+     */
+    public function getFrames() 
+    {
+        return $this->_frames; 
+    }
+
+    /**
+     * Returns the number of bytes in the file.
+     *
+     * @return integer
+     */
+    public function getBytes() 
+    {
+        return $this->_bytes; 
+    }
+
+    /**
+     * Returns the table of contents array. The returned array has a fixed
+     * amount of 100 seek points to the file.
+     *
+     * @return Array
+     */
+    public function getToc() 
+    {
+        return $this->_toc; 
+    }
+
+    /**
+     * Returns the quality indicator. The indicator is from 0 (best quality) to
+     * 100 (worst quality).
+     *
+     * @return integer
+     */
+    public function getQualityIndicator() 
+    {
+        return $this->_qualityIndicator; 
+    }
+
+    /**
+     * Returns the length of the header in bytes.
+     *
+     * @return integer
+     */
+    public function getLength()
+    {
+        return 4 +
+            ($this->_frames !== false ? 4 : 0) +
+            ($this->_bytes !== false ? 4 : 0) +
+            (empty($this->_toc) ? 0 : 100) +
+            ($this->_qualityIndicator !== false ? 4 : 0);
+    }
+}