Add support for ISO base media file format

git-svn-id: http://php-reader.googlecode.com/svn/trunk@85 51a70ab9-7547-0410-9469-37e369ee0574
2008-04-23 20:21:36 +00:00
parent 3191721e15
commit 42d91f7e33
74 changed files with 7032 additions and 0 deletions
--- a/src/ISO14496/Box/PDIN.php
+++ b/src/ISO14496/Box/PDIN.php
@@ -0,0 +1,97 @@
+<?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 ISO 14496
+ * @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("ISO14496/Box/Full.php");
+/**#@-*/
+
+/**
+ * The <i>Progressive Download Information Box</i> aids the progressive download
+ * of an ISO file. The box contains pairs of numbers (to the end of the box)
+ * specifying combinations of effective file download bitrate in units of
+ * bytes/sec and a suggested initial playback delay in units of milliseconds.
+ *
+ * A receiving party can estimate the download rate it is experiencing, and from
+ * that obtain an upper estimate for a suitable initial delay by linear
+ * interpolation between pairs, or by extrapolation from the first or last
+ * entry.
+ *
+ * @package    php-reader
+ * @subpackage ISO 14496
+ * @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 ISO14496_Box_PDIN extends ISO14496_Box_Full
+{
+  /** @var Array */
+  private $_progressiveDownloadInfo = array();
+
+  /**
+   * Constructs the class with given parameters and reads box related data from
+   * the ISO Base Media file.
+   *
+   * @param Reader  $reader The reader object.
+   */
+  public function __construct($reader)
+  {
+    parent::__construct($reader);
+    
+    while ($this->_reader->getOffset() < $this->_offset + $this->_size())
+      $this->_progressiveDownloadInfo[] = array
+        ("rate" => $this->_reader->readUInt32BE(),
+         "initialDelay" => $this->_reader->readUInt32BE());
+  }
+  
+  /**
+   * Returns the progressive download information array. The array consists of
+   * items having two keys.
+   *
+   *   o rate  --  the download rate expressed in bytes/second
+   *   o initialDelay  --  the suggested delay to use when playing the file,
+   *     such that if download continues at the given rate, all data within the
+   *     file will arrive in time for its use and playback should not need to
+   *     stall.
+   * 
+   * @return Array
+   */
+  public function getProgressiveDownloadInfo()
+  {
+    return $this->_progressiveDownloadInfo;
+  }
+}