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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------------+
// | File_Ogg PEAR Package for Accessing Ogg Bitstreams |
// | Copyright (c) 2005-2007 |
// | David Grant <david@grant.org.uk> |
// | Tim Starling <tstarling@wikimedia.org> |
// +----------------------------------------------------------------------------+
// | This library is free software; you can redistribute it and/or |
// | modify it under the terms of the GNU Lesser General Public |
// | License as published by the Free Software Foundation; either |
// | version 2.1 of the License, or (at your option) any later version. |
// | |
// | This library is distributed in the hope that it will be useful, |
// | but WITHOUT ANY WARRANTY; without even the implied warranty of |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
// | Lesser General Public License for more details. |
// | |
// | You should have received a copy of the GNU Lesser General Public |
// | License along with this library; if not, write to the Free Software |
// | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
// +----------------------------------------------------------------------------+
/**
* @author David Grant <david@grant.org.uk>, Tim Starling <tstarling@wikimedia.org>
* @category File
* @copyright David Grant <david@grant.org.uk>, Tim Starling <tstarling@wikimedia.org>
* @license http://www.gnu.org/copyleft/lesser.html GNU LGPL
* @link http://pear.php.net/package/File_Ogg
* @link http://www.speex.org/docs.html
* @package File_Ogg
* @version CVS: $Id: Speex.php,v 1.10 2005/11/16 20:43:27 djg Exp $
*/
class File_Ogg_Speex extends File_Ogg_Media
{
/**
* @access private
*/
function __construct($streamSerial, $streamData, $filePointer)
{
parent::__construct($streamSerial, $streamData, $filePointer);
$this->_decodeHeader();
$this->_decodeCommentsHeader();
$endSec =
(( '0x' . substr( $this->_lastGranulePos, 0, 8 ) ) * pow(2, 32)
+ ( '0x' . substr( $this->_lastGranulePos, 8, 8 ) ))
/ $this->_header['rate'];
$startSec =
(( '0x' . substr( $this->_firstGranulePos, 0, 8 ) ) * pow(2, 32)
+ ( '0x' . substr( $this->_firstGranulePos, 8, 8 ) ))
/ $this->_header['rate'];
//make sure the offset is worth taking into account oggz_chop related hack
if( $startSec > 1){
$this->_streamLength = $endSec - $startSec;
$this->_startOffset = $startSec;
}else{
$this->_streamLength = $endSec;
}
}
/**
* Get a short string describing the type of the stream
* @return string
*/
function getType()
{
return 'Speex';
}
/**
* Decode the stream header
* @access private
*/
function _decodeHeader()
{
fseek($this->_filePointer, $this->_streamData['pages'][0]['body_offset'], SEEK_SET);
// The first 8 characters should be "Speex ".
if (fread($this->_filePointer, 8) != 'Speex ')
throw new OggException("Stream is undecodable due to a malformed header.", OGG_ERROR_UNDECODABLE);
$this->_version = fread($this->_filePointer, 20);
$this->_header = File_Ogg::_readLittleEndian($this->_filePointer, array(
'speex_version_id' => 32,
'header_size' => 32,
'rate' => 32,
'mode' => 32,
'mode_bitstream_version'=> 32,
'nb_channels' => 32,
'bitrate' => 32,
'frame_size' => 32,
'vbr' => 32,
'frames_per_packet' => 32,
'extra_headers' => 32,
'reserved1' => 32,
'reserved2' => 32
));
$this->_header['speex_version'] = $this->_version;
}
/**
* Get an associative array containing header information about the stream
* @access public
* @return array
*/
function getHeader() {
return $this->_header;
}
/**
* Decode the comments header
* @access private
*/
function _decodeCommentsHeader()
{
fseek($this->_filePointer, $this->_streamData['pages'][1]['body_offset'], SEEK_SET);
$this->_decodeBareCommentsHeader();
}
}
?>
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