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Add partial support for MPEG Program Stream (as specified by ISO/IEC 13818-1)

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git-svn-id: http://php-reader.googlecode.com/svn/trunk@115 51a70ab9-7547-0410-9469-37e369ee0574
This commit is contained in:
svollbehr
2008-12-06 21:35:29 +00:00
parent edc63529da
commit 2e3b2e3199
3 changed files with 168 additions and 23 deletions
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25
src/MPEG/Audio.php
View File

@@ -271,7 +271,7 @@ final class MPEG_Audio extends MPEG_Audio_Object
*/
public function getFormattedLengthEstimate()
{
return $this->_formatTime($this->getLengthEstimate());
return $this->formatTime($this->getLengthEstimate());
}
/**
@@ -285,28 +285,7 @@ final class MPEG_Audio extends MPEG_Audio_Object
*/
public function getFormattedLength()
{
return $this->_formatTime($this->getLength());
}
/**
* Formats given time in seconds into the form of
* [hours]:minutes:seconds.milliseconds.
*
* @param integer $seconds The time to format, in seconds
* @return string
*/
private function _formatTime($seconds)
{
$milliseconds = round(($seconds - floor($seconds)) * 1000);
$seconds = floor($seconds);
$minutes = floor($seconds / 60);
$hours = floor($minutes / 60);
return
($minutes > 0 ?
($hours > 0 ? $hours . ":" .
str_pad($minutes % 60, 2, "0", STR_PAD_LEFT) : $minutes % 60) . ":" .
str_pad($seconds % 60, 2, "0", STR_PAD_LEFT) : $seconds % 60) . "." .
str_pad($milliseconds, 3, "0", STR_PAD_LEFT);
return $this->formatTime($this->getLength());
}
/**

21
src/MPEG/Object.php
View File

@@ -195,6 +195,27 @@ abstract class MPEG_Object
return 0;
}
/**
* Formats given time in seconds into the form of
* [hours]:minutes:seconds.milliseconds.
*
* @param integer $seconds The time to format, in seconds
* @return string
*/
protected function formatTime($seconds)
{
$milliseconds = round(($seconds - floor($seconds)) * 1000);
$seconds = floor($seconds);
$minutes = floor($seconds / 60);
$hours = floor($minutes / 60);
return
($minutes > 0 ?
($hours > 0 ? $hours . ":" .
str_pad($minutes % 60, 2, "0", STR_PAD_LEFT) : $minutes % 60) . ":" .
str_pad($seconds % 60, 2, "0", STR_PAD_LEFT) : $seconds % 60) . "." .
str_pad($milliseconds, 3, "0", STR_PAD_LEFT);
}
/**
* Magic function so that $obj->value will work.
*

145
src/MPEG/ProgramStream.php Normal file
View File

@@ -0,0 +1,145 @@
<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: MPEG.php 1 2008-07-06 10:43:41Z rbutterfield $
*/
/**#@+ @ignore */
require_once("Twiddling.php");
require_once("MPEG/Object.php");
/**#@-*/
/**
* This class represents a MPEG Program Stream encoded file as described in
* ISO/IEC 13818-1 Systems standard.
*
* The Program Stream is a stream definition which is tailored for communicating
* or storing one program of coded data and other data in environments where
* errors are very unlikely, and where processing of system coding, e.g. by
* software, is a major consideration.
*
* This class only supports the parsing of the play duration.
*
* @package php-reader
* @subpackage MPEG
* @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: 1 $
* @todo Full implementation
*/
final class MPEG_ProgramStream extends MPEG_Object
{
/** @var integer */
private $_length;
/**
* Constructs the MPEG_ProgramStream class with given file and options.
*
* @param string|Reader $filename The path to the file, file descriptor of an
* opened file, or {@link Reader} instance.
* @param Array $options The options array.
*/
public function __construct($filename, $options = array())
{
if ($filename instanceof Reader)
$reader = &$filename;
else
$reader = new Reader($filename);
parent::__construct($reader, $options);
$startCode = 0; $startTime = 0;
$pictureCount = 0; $pictureRate = 0;
$rates = array ( 0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60 );
$foundSeqHdr = false; $foundGOP = false;
do {
do {
$startCode = $this->nextStartCode();
} while ($startCode != 0x1b3 && $startCode != 0x1b8);
if ($startCode == 0x1b3 /* sequence_header_code */ && $pictureRate == 0) {
$i1 = $this->_reader->readUInt32BE();
$i2 = $this->_reader->readUInt32BE();
if (!Twiddling::testAllBits($i2, 0x2000))
throw new RuntimeException("Invalid mark");
$pictureRate = $rates[Twiddling::getValue($i1, 4, 8)];
$foundSeqHdr = true;
}
if ($startCode == 0x1b8 /* group_start_code */) {
$tmp = $this->_reader->readUInt32BE();
$startTime = (($tmp >> 26) & 0x1f) * 60 * 60 * 1000 /* hours */ +
(($tmp >> 20) & 0x3f) * 60 * 1000 /* minutes */ +
(($tmp >> 13) & 0x3f) * 1000 /* seconds */ +
(int)(1 / $pictureRate * (($tmp >> 7) & 0x3f) * 1000);
$foundGOP = true;
}
} while (!$foundSeqHdr || !$foundGOP);
$this->_reader->setOffset($this->_reader->getSize());
do {
if (($startCode = $this->prevStartCode()) == 0x100)
$pictureCount++;
} while ($startCode != 0x1b8);
$this->_reader->skip(4);
$tmp = $this->_reader->readUInt32BE();
$this->_length =
(((($tmp >> 26) & 0x1f) * 60 * 60 * 1000 /* hours */ +
(($tmp >> 20) & 0x3f) * 60 * 1000 /* minutes */ +
(($tmp >> 13) & 0x3f) * 1000 /* seconds */ +
(int)(1 / $pictureRate * (($tmp >> 7) & 0x3f) * 1000)) - $startTime +
(int)(1 / $pictureRate * $pictureCount * 1000)) / 1000;
}
/**
* Returns the exact playtime in seconds.
*
* @return integer
*/
public function getLength() { return $this->_length; }
/**
* Returns the exact playtime given in seconds as a string in the form of
* [hours]:minutes:seconds.milliseconds.
*
* @param integer $seconds The playtime in seconds.
* @return string
*/
public function getFormattedLength()
{
return $this->formatTime($this->getLength());
}
}