8bdcf4209a
git-svn-id: http://php-reader.googlecode.com/svn/trunk@241 51a70ab9-7547-0410-9469-37e369ee0574
83 lines
3.1 KiB
PHP
83 lines
3.1 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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* @category Zend
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* @package Zend_Media
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* @subpackage FLAC
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* @copyright Copyright (c) 2005-2011 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/Flac/MetadataBlock.php';
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/**#@-*/
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/**
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* This class represents the seektable metadata block. This is an optional block for storing seek points. It is possible
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* to seek to any given sample in a FLAC stream without a seek table, but the delay can be unpredictable since the
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* bitrate may vary widely within a stream. By adding seek points to a stream, this delay can be significantly reduced.
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* Each seek point takes 18 bytes, so 1% resolution within a stream adds less than 2k. There can be only one SEEKTABLE
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* in a stream, but the table can have any number of seek points. There is also a special 'placeholder' seekpoint which
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* will be ignored by decoders but which can be used to reserve space for future seek point insertion.
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*
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* @category Zend
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* @package Zend_Media
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* @subpackage FLAC
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* @author Sven Vollbehr <sven@vollbehr.eu>
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* @copyright Copyright (c) 2005-2011 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_Flac_MetadataBlock_Seektable extends Zend_Media_Flac_MetadataBlock
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{
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/** @var Array */
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private $_seekpoints = array();
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/**
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* Constructs the class with given parameters and parses object related data.
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*
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* @param Zend_Io_Reader $reader The reader object.
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*/
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public function __construct($reader)
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{
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parent::__construct($reader);
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$seekpointCount = $this->getSize() / 18;
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for ($i = 0; $i < $seekpointCount; $i++) {
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$this->_seekpoints[] = array(
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'sampleNumber' => $this->_reader->readInt64BE(),
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'offset' => $this->_reader->readInt64BE(),
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'numberOfSamples' => $this->_reader->readUInt16BE()
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);
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}
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}
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/**
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* Returns the seekpoint table. The array consists of items having three keys.
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*
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* o sampleNumber -- Sample number of first sample in the target frame, or 0xFFFFFFFFFFFFFFFF for a
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* placeholder point.
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* o offset -- Offset (in bytes) from the first byte of the first frame header to the first byte of the
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* target frame's header.
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* o numberOfSamples -- Number of samples in the target frame.
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*
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* @return Array
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*/
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public function getSeekpoints()
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{
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return $this->_seekpoints;
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}
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}
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