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+<?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: ILOC.php 92 2008-05-10 13:43:14Z svollbehr $
+ */
+
+/**#@+ @ignore */
+require_once("ISO14496/Box.php");
+/**#@-*/
+
+/**
+ * The <i>The Item Location Box</i> provides a directory of resources in this or
+ * other files, by locating their containing file, their offset within that
+ * file, and their length. Placing this in binary format enables common handling
+ * of this data, even by systems which do not understand the particular metadata
+ * system (handler) used. For example, a system might integrate all the
+ * externally referenced metadata resources into one file, re-adjusting file
+ * offsets and file references accordingly.
+ *
+ * Items may be stored fragmented into extents, e.g. to enable interleaving. An
+ * extent is a contiguous subset of the bytes of the resource; the resource is
+ * formed by concatenating the extents. If only one extent is used then either
+ * or both of the offset and length may be implied:
+ *
+ * o If the offset is not identified (the field has a length of zero), then
+ * the beginning of the file (offset 0) is implied.
+ * o If the length is not specified, or specified as zero, then the entire
+ * file length is implied. References into the same file as this metadata,
+ * or items divided into more than one extent, should have an explicit
+ * offset and length, or use a MIME type requiring a different
+ * interpretation of the file, to avoid infinite recursion.
+ *
+ * The size of the item is the sum of the extentLengths. Note: extents may be
+ * interleaved with the chunks defined by the sample tables of tracks.
+ *
+ * The dataReferenceIndex may take the value 0, indicating a reference into the
+ * same file as this metadata, or an index into the dataReference table.
+ *
+ * Some referenced data may itself use offset/length techniques to address
+ * resources within it (e.g. an MP4 file might be included in this way).
+ * Normally such offsets are relative to the beginning of the containing file.
+ * The field base offset provides an additional offset for offset calculations
+ * within that contained data. For example, if an MP4 file is included within a
+ * file formatted to this specification, then normally data-offsets within that
+ * MP4 section are relative to the beginning of file; baseOffset adds to those
+ * offsets.
+ *
+ * @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: 92 $
+ */
+final class ISO14496_Box_ILOC extends ISO14496_Box
+{
+ /** @var Array */
+ private $_items = 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, &$options = array())
+ {
+ parent::__construct($reader, $options);
+
+ $offsetSize = (($tmp = $this->_reader->readUInt32BE()) >> 28) & 0xf;
+ $lengthSize = ($tmp >> 24) & 0xf;
+ $baseOffsetSize = ($tmp >> 20) & 0xf;
+ $itemCount = $this->_reader->readUInt16BE();
+ for ($i = 0; $i < $itemCount; $i++) {
+ $item = array();
+ $item["itemId"] = $this->_reader->readUInt16BE();
+ $item["dataReferenceIndex"] = $this->_reader->readUInt16BE();
+ $item["baseOffset"] =
+ ($baseOffsetSize == 4 ? $this->_reader->readUInt32BE() :
+ ($baseOffsetSize == 8 ? $this->_reader->readInt64BE() : 0));
+ $item["extents"] = array();
+ for ($j = 0; $j < $extentCount; $j++) {
+ $extent = array();
+ $extent["offset"] =
+ ($offsetSize == 4 ? $this->_reader->readUInt32BE() :
+ ($offsetSize == 8 ? $this->_reader->readInt64BE() : 0));
+ $extent["length"] =
+ ($lengthSize == 4 ? $this->_reader->readUInt32BE() :
+ ($lengthSize == 8 ? $this->_reader->readInt64BE() : 0));
+ $item["extents"][] = $extent;
+ }
+ $this->_items[] = $item;
+ }
+ }
+
+ /**
+ * Returns the array of items. Each entry has the following keys set: itemId,
+ * dataReferenceIndex, baseOffset, and extents.
+ *
+ * @return Array
+ */
+ public function getItems() { return $this->_items; }
+}