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/STSZ.php
+++ b/src/ISO14496/Box/STSZ.php
@@ -0,0 +1,106 @@
+<?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>Sample Size Box</i> contains the sample count and a table giving the
+ * size in bytes of each sample. This allows the media data itself to be
+ * unframed. The total number of samples in the media is always indicated in the
+ * sample count.
+ *
+ * There are two variants of the sample size box. The first variant has a fixed
+ * size 32-bit field for representing the sample sizes; it permits defining a
+ * constant size for all samples in a track. The second variant permits smaller
+ * size fields, to save space when the sizes are varying but small. One of these
+ * boxes must be present; the first version is preferred for maximum
+ * compatibility.
+ *
+ * @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_STSZ extends ISO14496_Box_Full
+{
+  /** @var integer */
+  private $_sampleSize;
+  
+  /** @var Array */
+  private $_sampleSizeTable = 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);
+    
+    $this->_sampleSize = $this->_reader->readUInt32BE();
+    $sampleCount = $this->_reader->readUInt32BE();
+    if ($this->_sampleSize == 0)
+      for ($i = 1; $i < $sampleCount; $i++)
+        $this->_sampleSizeTable[$i] = $this->_reader->readUInt32BE();
+  }
+  
+  /**
+   * Returns the default sample size. If all the samples are the same size, this
+   * field contains that size value. If this field is set to 0, then the samples
+   * have different sizes, and those sizes are stored in the sample size table.
+   *
+   * @return integer
+   */
+  public function getSampleSize() { return $this->_sampleSize; }
+  
+  /**
+   * Returns an array of sample sizes specifying the size of a sample, indexed
+   * by its number.
+   *
+   * @return Array
+   */
+  public function getSampleSizeTable()
+  {
+    return $this->_sampleSizeTable;
+  }
+}