Add Zend_Media_Asf class proposal

git-svn-id: http://php-reader.googlecode.com/svn/branches/zend@168 51a70ab9-7547-0410-9469-37e369ee0574
2010-03-06 09:06:20 +00:00
parent 2d57b1fd24
commit ebe67fdf7f
80 changed files with 7805 additions and 8057 deletions
--- a/src/Zend/Media/Asf/Object/StreamBitrateProperties.php
+++ b/src/Zend/Media/Asf/Object/StreamBitrateProperties.php
@@ -0,0 +1,134 @@
+<?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 ASF
+ * @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 'Zend/Media/Asf/Object.php';
+/**#@-*/
+
+/**
+ * The <i>Stream Bitrate Properties Object</i> defines the average bit rate of
+ * each digital media stream.
+ *
+ * @category   Zend
+ * @package    Zend_Media
+ * @subpackage ASF
+ * @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    $Id$
+ */
+final class Zend_Media_Asf_Object_StreamBitrateProperties
+    extends Zend_Media_Asf_Object
+{
+    /** @var Array */
+    private $_bitrateRecords = array();
+
+    /**
+     * Constructs the class with given parameters and reads object related data
+     * from the ASF file.
+     *
+     * @param Zend_Io_Reader $reader  The reader object.
+     * @param Array          $options The options array.
+     */
+    public function __construct($reader = null, &$options = array())
+    {
+        parent::__construct($reader, $options);
+
+        if ($reader === null) {
+            return;
+        }
+
+        $bitrateRecordsCount = $this->_reader->readUInt16LE();
+        for ($i = 0; $i < $bitrateRecordsCount; $i++) {
+            $this->_bitrateRecords[] = array
+                ('streamNumber' =>
+                     ($tmp = $this->_reader->readInt16LE()) & 0x1f,
+                 'flags' => $tmp >> 5,
+                 'averageBitrate' => $this->_reader->readUInt32LE());
+        }
+    }
+
+    /**
+     * Returns an array of bitrate records. Each record consists of the
+     * following keys.
+     *
+     *   o streamNumber -- Specifies the number of this stream described by this
+     *     record. 0 is an invalid stream. Valid values are between 1 and 127.
+     *
+     *   o flags -- These bits are reserved and should be set to 0.
+     *
+     *   o averageBitrate -- Specifies the average bit rate of the stream in
+     *     bits per second. This value should include an estimate of ASF packet
+     *     and payload overhead associated with this stream.
+     *
+     * @return Array
+     */
+    public function getBitrateRecords() 
+    {
+        return $this->_bitrateRecords; 
+    }
+
+    /**
+     * Sets an array of bitrate records. Each record consists of the following
+     * keys.
+     *
+     *   o streamNumber -- Specifies the number of this stream described by this
+     *     record. 0 is an invalid stream. Valid values are between 1 and 127.
+     *
+     *   o flags -- These bits are reserved and should be set to 0.
+     *
+     *   o averageBitrate -- Specifies the average bit rate of the stream in bits
+     *     per second. This value should include an estimate of ASF packet and
+     *     payload overhead associated with this stream.
+     *
+     * @param Array $bitrateRecords The array of bitrate records.
+     */
+    public function setBitrateRecords($bitrateRecords)
+    {
+        $this->_bitrateRecords = $bitrateRecords;
+    }
+
+    /**
+     * Writes the object data.
+     *
+     * @param Zend_Io_Writer $writer The writer object.
+     * @return void
+     */
+    public function write($writer)
+    {
+        $bitrateRecordsCount = count($this->_bitrateRecords);
+
+        $this->setSize
+            (24 /* for header */ + 2 + $bitrateRecordsCount * 6);
+
+        $writer->writeGuid($this->getIdentifier())
+               ->writeInt64LE($this->getSize())
+               ->writeUInt16LE($bitrateRecordsCount);
+        for ($i = 0; $i < $bitrateRecordsCount; $i++) {
+            $writer->writeUInt16LE
+                        (($this->_bitrateRecords[$i]['flags'] << 5) |
+                         ($this->_bitrateRecords[$i]['streamNumber'] & 0x1f))
+                   ->writeUInt32LE
+                        ($this->_bitrateRecords[$i]['averageBitrate']);
+        }
+    }
+}