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Add support for MPEG-1/2 Audio (ISO/IEC 11172-3 and ISO/IEC 13818-3 respectively)

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git-svn-id: http://php-reader.googlecode.com/svn/trunk@114 51a70ab9-7547-0410-9469-37e369ee0574
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svollbehr
2008-12-03 21:49:43 +00:00
parent 07a5e6bd3c
commit edc63529da
10 changed files with 2090 additions and 8 deletions
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225
src/MPEG/Object.php Normal file
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<?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: Object.php 107 2008-08-03 19:09:16Z svollbehr $
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("MPEG/Exception.php");
/**#@-*/
/**
* The base class for all MPEG objects.
*
* @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: 107 $
*/
abstract class MPEG_Object
{
/**
* The reader object.
*
* @var Reader
*/
protected $_reader;
/**
* The options array.
*
* @var Array
*/
private $_options;
/**
* Constructs the class with given parameters.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader, &$options = array())
{
$this->_reader = $reader;
$this->_options = &$options;
}
/**
* Returns the options array.
*
* @return Array
*/
public function getOptions() { return $this->_options; }
/**
* Returns the given option value, or the default value if the option is not
* defined.
*
* @param string $option The name of the option.
* @param mixed $defaultValue The default value to be returned.
*/
public function getOption($option, $defaultValue = false)
{
if (isset($this->_options[$option]))
return $this->_options[$option];
return $defaultValue;
}
/**
* Sets the options array. See {@link MPEG} class for available options.
*
* @param Array $options The options array.
*/
public function setOptions(&$options) { $this->_options = &$options; }
/**
* Sets the given option the given value.
*
* @param string $option The name of the option.
* @param mixed $value The value to set for the option.
*/
public function setOption($option, $value)
{
$this->_options[$option] = $value;
}
/**
* Finds and returns the next start code. Start codes are reserved bit
* patterns in the video file that do not otherwise occur in the video stream.
*
* All start codes are byte aligned and start with the following byte
* sequence: 0x00 0x00 0x01.
*
* @return integer
*/
protected function nextStartCode()
{
$buffer = " ";
for ($i = 0; $i < 4; $i++) {
$start = $this->_reader->getOffset();
if (($buffer = substr($buffer, -4) . $this->_reader->read(512)) === false)
throw new MPEG_Exception("Invalid data");
$limit = strlen($buffer);
$pos = 0;
while ($pos < $limit - 3) {
if (Transform::fromUInt8($buffer{$pos++}) == 0 &&
Transform::fromUInt16BE(substr($buffer, $pos, 2)) == 1) {
if (($pos += 2) < $limit - 2)
if (Transform::fromUInt16BE(substr($buffer, $pos, 2)) == 0 &&
Transform::fromUInt8($buffer{$pos + 2}) == 1)
continue;
$this->_reader->setOffset($start + $pos - 3);
return Transform::fromUInt8($buffer{$pos++}) & 0xff | 0x100;
}
}
$this->_reader->setOffset($start + $limit);
}
/* No start code found within 2048 bytes, the maximum size of a pack */
throw new MPEG_Exception("Invalid data");
}
/**
* Finds and returns the previous start code. Start codes are reserved bit
* patterns in the video file that do not otherwise occur in the video stream.
*
* All start codes are byte aligned and start with the following byte
* sequence: 0x00 0x00 0x01.
*
* @return integer
*/
protected function prevStartCode()
{
$buffer = " ";
$start;
$position = $this->_reader->getOffset();
while ($position > 0) {
$start = 0;
$position = $position - 512;
if ($position < 0)
throw new MPEG_Exception("Invalid data");
$this->_reader->setOffset($position);
$buffer = $this->_reader->read(512) . substr($buffer, 0, 4);
$pos = 512 - 8;
while ($pos > 3) {
if (Transform::fromUInt8($buffer{$pos}) == 0 &&
Transform::fromUInt16BE(substr($buffer, $pos + 1, 2)) == 1) {
if ($pos + 2 < 512 &&
Transform::fromUInt16BE(substr($buffer, $pos + 3, 2)) == 0 &&
Transform::fromUInt8($buffer{$pos + 5}) == 1) {
$pos --;
continue;
}
$this->_reader->setOffset($position + $pos);
return Transform::fromUInt8($buffer{$pos + 3}) & 0xff | 0x100;
}
$pos--;
}
$this->_reader->setOffset($position = $position + 3);
}
return 0;
}
/**
* Magic function so that $obj->value will work.
*
* @param string $name The field name.
* @return mixed
*/
public function __get($name)
{
if (method_exists($this, "get" . ucfirst($name)))
return call_user_func(array($this, "get" . ucfirst($name)));
else throw new MPEG_Exception("Unknown field: " . $name);
}
/**
* Magic function so that assignments with $obj->value will work.
*
* @param string $name The field name.
* @param string $value The field value.
* @return mixed
*/
public function __set($name, $value)
{
if (method_exists($this, "set" . ucfirst($name)))
call_user_func
(array($this, "set" . ucfirst($name)), $value);
else throw new MPEG_Exception("Unknown field: " . $name);
}
}