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/SDTP.php
+++ b/src/ISO14496/Box/SDTP.php
@@ -0,0 +1,127 @@
+<?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>Independent and Disposable Samples Box</i> optional table answers
+ * three questions about sample dependency:
+ *   1) does this sample depend on others (is it an I-picture)?
+ *   2) do no other samples depend on this one?
+ *   3) does this sample contain multiple (redundant) encodings of the data at
+ *      this time-instant (possibly with different dependencies)?
+ *
+ * In the absence of this table:
+ *   1) the sync sample table answers the first question; in most video codecs,
+ *      I-pictures are also sync points,
+ *   2) the dependency of other samples on this one is unknown.
+ *   3) the existence of redundant coding is unknown.
+ *
+ * When performing trick modes, such as fast-forward, it is possible to use the
+ * first piece of information to locate independently decodable samples.
+ * Similarly, when performing random access, it may be necessary to locate the
+ * previous sync point or random access recovery point, and roll-forward from
+ * the sync point or the pre-roll starting point of the random access recovery
+ * point to the desired point. While rolling forward, samples on which no others
+ * depend need not be retrieved or decoded.
+ * 
+ * The value of sampleIsDependedOn is independent of the existence of redundant
+ * codings. However, a redundant coding may have different dependencies from the
+ * primary coding; if redundant codings are available, the value of
+ * sampleDependsOn documents only the primary coding.
+ *
+ * A sample dependency Box may also occur in the {@link ISO14496_Box_TRAF Track
+ * Fragment Box}.
+ *
+ * @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_SDTP extends ISO14496_Box_Full
+{
+  /** @var Array */
+  private $_sampleDependencyTypeTable = 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($reader);
+    
+    for ($i = 0; $this->_reader->getOffset() <
+                 $this->_offset + $this->_size; $i++)
+      $this->_sampleDependencyTypeTable[$i] = array
+        ("sampleDependsOn" => (($tmp = $this->_reader->readInt8()) >> 4) & 0x3,
+         "sampleIsDependedOn" => ($tmp >> 2) & 0x3,
+         "sampleHasRedundancy" => $tmp & 0x3);
+  }
+  
+  /**
+   * Returns an array of values. Each entry is an array containing the following
+   * keys.
+   *   o sampleDependsOn -- takes one of the following four values:
+   *     0: the dependency of this sample is unknown;
+   *     1: this sample does depend on others (not an I picture);
+   *     2: this sample does not depend on others (I picture);
+   *     3: reserved
+   *   o sampleIsDependedOn -- takes one of the following four values:
+   *     0: the dependency of other samples on this sample is unknown;
+   *     1: other samples depend on this one (not disposable);
+   *     2: no other sample depends on this one (disposable);
+   *     3: reserved
+   *   o sampleHasRedundancy -- takes one of the following four values:
+   *     0: it is unknown whether there is redundant coding in this sample;
+   *     1: there is redundant coding in this sample;
+   *     2: there is no redundant coding in this sample;
+   *     3: reserved
+   *
+   * @return Array
+   */
+  public function getSampleDependencyTypeTable()
+  {
+    return $this->_sampleDependencyTypeTable;
+  }
+}