9a83f77ef2
git-svn-id: http://php-reader.googlecode.com/svn/branches/zend@163 51a70ab9-7547-0410-9469-37e369ee0574
246 lines
9.6 KiB
PHP
246 lines
9.6 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @category Zend
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* @package Zend_Media
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* @subpackage ISO 14496
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once 'Zend/Media/Iso14496/Box.php';
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/**#@-*/
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/**
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* The <i>The Item Location Box</i> provides a directory of resources in this or
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* other files, by locating their containing file, their offset within that
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* file, and their length. Placing this in binary format enables common handling
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* of this data, even by systems which do not understand the particular metadata
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* system (handler) used. For example, a system might integrate all the
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* externally referenced metadata resources into one file, re-adjusting file
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* offsets and file references accordingly.
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*
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* Items may be stored fragmented into extents, e.g. to enable interleaving. An
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* extent is a contiguous subset of the bytes of the resource; the resource is
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* formed by concatenating the extents. If only one extent is used then either
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* or both of the offset and length may be implied:
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*
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* o If the offset is not identified (the field has a length of zero), then
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* the beginning of the file (offset 0) is implied.
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* o If the length is not specified, or specified as zero, then the entire
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* file length is implied. References into the same file as this metadata,
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* or items divided into more than one extent, should have an explicit
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* offset and length, or use a MIME type requiring a different
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* interpretation of the file, to avoid infinite recursion.
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*
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* The size of the item is the sum of the extentLengths. Note: extents may be
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* interleaved with the chunks defined by the sample tables of tracks.
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*
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* The dataReferenceIndex may take the value 0, indicating a reference into the
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* same file as this metadata, or an index into the dataReference table.
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*
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* Some referenced data may itself use offset/length techniques to address
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* resources within it (e.g. an MP4 file might be included in this way).
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* Normally such offsets are relative to the beginning of the containing file.
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* The field base offset provides an additional offset for offset calculations
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* within that contained data. For example, if an MP4 file is included within a
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* file formatted to this specification, then normally data-offsets within that
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* MP4 section are relative to the beginning of file; baseOffset adds to those
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* offsets.
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*
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* @category Zend
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* @package Zend_Media
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* @subpackage ISO 14496
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* @author Sven Vollbehr <sven@vollbehr.eu>
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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final class Zend_Media_Iso14496_Box_Iloc extends Zend_Media_Iso14496_Box
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{
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/** @var Array */
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private $_items = array();
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/**
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* Constructs the class with given parameters and reads box related data
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* from the ISO Base Media file.
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*
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* @param Zend_Io_Reader $reader The reader object.
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* @param Array $options The options array.
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*/
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public function __construct($reader, &$options = array())
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{
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parent::__construct($reader, $options);
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$offsetSize = (($tmp = $this->_reader->readUInt16BE()) >> 12) & 0xf;
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$lengthSize = ($tmp >> 8) & 0xf;
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$baseOffsetSize = ($tmp >> 4) & 0xf;
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$itemCount = $this->_reader->readUInt16BE();
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for ($i = 0; $i < $itemCount; $i++) {
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$item = array();
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$item['itemId'] = $this->_reader->readUInt16BE();
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$item['dataReferenceIndex'] = $this->_reader->readUInt16BE();
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$item['baseOffset'] =
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($baseOffsetSize == 4 ? $this->_reader->readUInt32BE() :
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($baseOffsetSize == 8 ? $this->_reader->readInt64BE() : 0));
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$extentCount = $this->_reader->readUInt16BE();
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$item['extents'] = array();
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for ($j = 0; $j < $extentCount; $j++) {
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$extent = array();
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$extent['offset'] =
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($offsetSize == 4 ? $this->_reader->readUInt32BE() :
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($offsetSize == 8 ? $this->_reader->readInt64BE() : 0));
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$extent['length'] =
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($lengthSize == 4 ? $this->_reader->readUInt32BE() :
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($lengthSize == 8 ? $this->_reader->readInt64BE() : 0));
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$item['extents'][] = $extent;
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}
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$this->_items[] = $item;
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}
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}
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/**
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* Returns the array of items. Each entry has the following keys set:
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* itemId, dataReferenceIndex, baseOffset, and extents.
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*
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* @return Array
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*/
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public function getItems()
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{
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return $this->_items;
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}
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/**
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* Sets the array of items. Each entry must have the following keys set:
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* itemId, dataReferenceIndex, baseOffset, and extents.
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*
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* @return Array
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*/
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public function setItems($items)
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{
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$this->_items = $items;
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}
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/**
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* Returns the box heap size in bytes.
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*
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* @return integer
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*/
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public function getHeapSize()
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{
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$totalSize = 4;
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for ($i = 0; $i < count($this->_itemId); $i++) {
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$totalSize += 6;
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if ($this->_itemId[$i]['baseOffset'] > 0xffffffff) {
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$totalSize += 8;
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} else {
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$totalSize += 4;
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}
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$extentCount = count($this->_itemId[$i]['extents']);
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for ($j = 0; $j < $extentCount; $j++) {
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if ($this->_itemId[$i]['extents'][$j]['offset'] > 0xffffffff) {
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$totalSize += 8 * $extentCount;
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} else {
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$totalSize += 4 * $extentCount;
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}
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if ($this->_itemId[$i]['extents'][$j]['length'] > 0xffffffff) {
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$totalSize += 8 * $extentCount;
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} else {
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$totalSize += 4 * $extentCount;
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}
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}
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}
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return parent::getHeapSize() + $totalSize;
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}
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/**
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* Writes the box data.
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*
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* @param Zend_Io_Writer $writer The writer object.
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* @return void
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*/
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protected function _writeData($writer)
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{
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parent::_writeData($writer);
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$offsetSize = 4;
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$lengthSize = 4;
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$baseOffsetSize = 4;
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$itemCount = count($this->_itemId);
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for ($i = 0; $i < $itemCount; $i++) {
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if ($this->_itemId[$i]['baseOffset'] > 0xffffffff) {
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$baseOffsetSize = 8;
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}
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for ($j = 0; $j < count($this->_itemId[$i]['extents']); $j++) {
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if ($this->_itemId[$i]['extents'][$j]['offset'] > 0xffffffff) {
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$offsetSize = 8;
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}
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if ($this->_itemId[$i]['extents'][$j]['length'] > 0xffffffff) {
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$lengthSize = 8;
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}
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}
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}
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$writer->writeUInt16BE
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((($offsetSize & 0xf) << 12) | (($lengthSize & 0xf) << 8) |
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(($baseOffsetSize & 0xf) << 4))
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->writeUInt16BE($itemCount);
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for ($i = 0; $i < $itemCount; $i++) {
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$writer->writeUInt16BE($this->_itemId[$i]['itemId'])
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->writeUInt16BE($this->_itemId[$i]['dataReferenceIndex']);
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if ($baseOffsetSize == 4) {
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$writer->writeUInt32BE($this->_itemId[$i]['baseOffset']);
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}
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if ($baseOffsetSize == 8) {
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$writer->writeInt64BE($this->_itemId[$i]['baseOffset']);
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}
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$writer->writeUInt16BE
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($extentCount = count($this->_itemId[$i]['extents']));
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for ($j = 0; $j < $extentCount; $j++) {
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if ($offsetSize == 4) {
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$writer->writeUInt32BE
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($this->_itemId[$i]['extents'][$j]['offset']);
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}
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if ($offsetSize == 8) {
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$writer->writeInt64BE
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($this->_itemId[$i]['extents'][$j]['offset']);
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}
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if ($offsetSize == 4) {
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$writer->writeUInt32BE
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($this->_itemId[$i]['extents'][$j]['length']);
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}
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if ($offsetSize == 8) {
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$writer->writeInt64BE
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($this->_itemId[$i]['extents'][$j]['length']);
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}
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}
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}
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}
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}
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