<?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    $Id$
 */

/**#@+ @ignore */
require_once 'Zend/Media/Iso14496/FullBox.php';
/**#@-*/

/**
 * The <i>Movie Extends Header Box</i> is optional, and provides the overall
 * duration, including fragments, of a fragmented movie. If this box is not
 * present, the overall duration must be computed by examining each fragment.
 *
 * @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    $Id$
 */
final class Zend_Media_Iso14496_Box_Mehd extends Zend_Media_Iso14496_FullBox
{
    /** @var integer */
    private $_fragmentDuration;

    /**
     * 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);

        if ($this->getVersion() == 1) {
            $this->_fragmentDuration = $this->_reader->readInt64BE();
        } else {
            $this->_fragmentDuration = $this->_reader->readUInt32BE();
        }
    }

    /**
     * Returns the length of the presentation of the whole movie including
     * fragments (in the timescale indicated in the
     * {@link Zend_Media_Iso14496_Box_Mvhd Movie Header Box}). The value of
     * this field corresponds to the duration of the longest track, including
     * movie fragments.
     *
     * @return integer
     */
    public function getFragmentDuration()
    {
        return $this->_fragmentDuration;
    }

    /**
     * Sets the length of the presentation of the whole movie including
     * fragments (in the timescale indicated in the
     * {@link Zend_Media_Iso14496_Box_Mvhd Movie Header Box}). The value of
     * this field must correspond to the duration of the longest track,
     * including movie fragments.
     *
     * @param integer $fragmentDuration The fragment duration.
     */
    public function setFragmentDuration($fragmentDuration)
    {
        $this->_fragmentDuration = $fragmentDuration;
    }

    /**
     * Returns the box heap size in bytes.
     *
     * @return integer
     */
    public function getHeapSize()
    {
        return parent::getHeapSize() + ($this->getVersion() == 1 ? 8 : 4);
    }

    /**
     * Writes the box data.
     *
     * @param Zend_Io_Writer $writer The writer object.
     * @return void
     */
    protected function _writeData($writer)
    {
        parent::_writeData($writer);
        if ($this->getVersion() == 1) {
            $writer->writeInt64BE($this->_fragmentDuration);
        } else {
            $writer->writeUInt32BE($this->_fragmentDuration);
        }
    }
}
