Add enhanced support for ASF files (partial)

git-svn-id: http://php-reader.googlecode.com/svn/trunk@102 51a70ab9-7547-0410-9469-37e369ee0574

src/ASF/Object/StreamBitrateProperties.php

@@ -0,0 +1,93 @@
+<?php
+/**
+ * PHP Reader Library
+ *
+ * Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  - Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  - Neither the name of the project workgroup nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package    php-reader
+ * @subpackage ASF
+ * @copyright  Copyright (c) 2008 The PHP Reader Project Workgroup
+ * @license    http://code.google.com/p/php-reader/wiki/License New BSD License
+ * @version    $Id$
+ */
+
+/**#@+ @ignore */
+require_once("ASF/Object.php");
+/**#@-*/
+
+/**
+ * The <i>Stream Bitrate Properties Object</i> defines the average bit rate of
+ * each digital media stream.
+ *
+ * @package    php-reader
+ * @subpackage ASF
+ * @author     Sven Vollbehr <svollbehr@gmail.com>
+ * @copyright  Copyright (c) 2008 The PHP Reader Project Workgroup
+ * @license    http://code.google.com/p/php-reader/wiki/License New BSD License
+ * @version    $Rev$
+ */
+final class ASF_Object_StreamBitrateProperties extends ASF_Object
+{
+  /** @var Array */
+  private $_bitrateRecords = array();
+  
+  /**
+   * Constructs the class with given parameters and reads object related data
+   * from the ASF file.
+   *
+   * @param Reader $reader  The reader object.
+   * @param Array  $options The options array.
+   */
+  public function __construct($reader, &$options = array())
+  {
+    parent::__construct($reader, $options);
+    
+    $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; }
+}