/src/Zend/Media/Iso14496/Box/Iloc.php
http://php-reader.googlecode.com/ · PHP · 245 lines · 124 code · 11 blank · 110 comment · 35 complexity · 8eae80ae9690e4527e01348990d8d22a MD5 · raw file
- <?php
- /**
- * Zend Framework
- *
- * LICENSE
- *
- * This source file is subject to the new BSD license that is bundled
- * with this package in the file LICENSE.txt.
- * It is also available through the world-wide-web at this URL:
- * http://framework.zend.com/license/new-bsd
- * If you did not receive a copy of the license and are unable to
- * obtain it through the world-wide-web, please send an email
- * to license@zend.com so we can send you a copy immediately.
- *
- * 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.
- *
- * @category Zend
- * @package Zend_Media
- * @subpackage ISO14496
- * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: Iloc.php 177 2010-03-09 13:13:34Z svollbehr $
- */
- /**#@+ @ignore */
- require_once 'Zend/Media/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.
- *
- * @category Zend
- * @package Zend_Media
- * @subpackage ISO14496
- * @author Sven Vollbehr <sven@vollbehr.eu>
- * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: Iloc.php 177 2010-03-09 13:13:34Z svollbehr $
- */
- final class Zend_Media_Iso14496_Box_Iloc extends Zend_Media_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 Zend_Io_Reader $reader The reader object.
- * @param Array $options The options array.
- */
- public function __construct($reader, &$options = array())
- {
- parent::__construct($reader, $options);
- $offsetSize = (($tmp = $this->_reader->readUInt16BE()) >> 12) & 0xf;
- $lengthSize = ($tmp >> 8) & 0xf;
- $baseOffsetSize = ($tmp >> 4) & 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));
- $extentCount = $this->_reader->readUInt16BE();
- $item['extents'] = array();
- for ($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 $this->_items;
- }
- /**
- * Sets the array of items. Each entry must have the following keys set:
- * itemId, dataReferenceIndex, baseOffset, and extents.
- *
- * @return Array
- */
- public function setItems($items)
- {
- $this->_items = $items;
- }
- /**
- * Returns the box heap size in bytes.
- *
- * @return integer
- */
- public function getHeapSize()
- {
- $totalSize = 4;
- for ($i = 0; $i < count($this->_itemId); $i++) {
- $totalSize += 6;
- if ($this->_itemId[$i]['baseOffset'] > 0xffffffff) {
- $totalSize += 8;
- } else {
- $totalSize += 4;
- }
- $extentCount = count($this->_itemId[$i]['extents']);
- for ($j = 0; $j < $extentCount; $j++) {
- if ($this->_itemId[$i]['extents'][$j]['offset'] > 0xffffffff) {
- $totalSize += 8 * $extentCount;
- } else {
- $totalSize += 4 * $extentCount;
- }
- if ($this->_itemId[$i]['extents'][$j]['length'] > 0xffffffff) {
- $totalSize += 8 * $extentCount;
- } else {
- $totalSize += 4 * $extentCount;
- }
- }
- }
- return parent::getHeapSize() + $totalSize;
- }
- /**
- * Writes the box data.
- *
- * @param Zend_Io_Writer $writer The writer object.
- * @return void
- */
- protected function _writeData($writer)
- {
- parent::_writeData($writer);
- $offsetSize = 4;
- $lengthSize = 4;
- $baseOffsetSize = 4;
- $itemCount = count($this->_itemId);
- for ($i = 0; $i < $itemCount; $i++) {
- if ($this->_itemId[$i]['baseOffset'] > 0xffffffff) {
- $baseOffsetSize = 8;
- }
- for ($j = 0; $j < count($this->_itemId[$i]['extents']); $j++) {
- if ($this->_itemId[$i]['extents'][$j]['offset'] > 0xffffffff) {
- $offsetSize = 8;
- }
- if ($this->_itemId[$i]['extents'][$j]['length'] > 0xffffffff) {
- $lengthSize = 8;
- }
- }
- }
- $writer->writeUInt16BE
- ((($offsetSize & 0xf) << 12) | (($lengthSize & 0xf) << 8) |
- (($baseOffsetSize & 0xf) << 4))
- ->writeUInt16BE($itemCount);
- for ($i = 0; $i < $itemCount; $i++) {
- $writer->writeUInt16BE($this->_itemId[$i]['itemId'])
- ->writeUInt16BE($this->_itemId[$i]['dataReferenceIndex']);
- if ($baseOffsetSize == 4) {
- $writer->writeUInt32BE($this->_itemId[$i]['baseOffset']);
- }
- if ($baseOffsetSize == 8) {
- $writer->writeInt64BE($this->_itemId[$i]['baseOffset']);
- }
- $writer->writeUInt16BE
- ($extentCount = count($this->_itemId[$i]['extents']));
- for ($j = 0; $j < $extentCount; $j++) {
- if ($offsetSize == 4) {
- $writer->writeUInt32BE
- ($this->_itemId[$i]['extents'][$j]['offset']);
- }
- if ($offsetSize == 8) {
- $writer->writeInt64BE
- ($this->_itemId[$i]['extents'][$j]['offset']);
- }
- if ($offsetSize == 4) {
- $writer->writeUInt32BE
- ($this->_itemId[$i]['extents'][$j]['length']);
- }
- if ($offsetSize == 8) {
- $writer->writeInt64BE
- ($this->_itemId[$i]['extents'][$j]['length']);
- }
- }
- }
- }
- }