diff options
Diffstat (limited to 'extensions/TimedMediaHandler/handlers/OggHandler/File_Ogg/File/Ogg/Speex.php')
| -rw-r--r-- | extensions/TimedMediaHandler/handlers/OggHandler/File_Ogg/File/Ogg/Speex.php | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/extensions/TimedMediaHandler/handlers/OggHandler/File_Ogg/File/Ogg/Speex.php b/extensions/TimedMediaHandler/handlers/OggHandler/File_Ogg/File/Ogg/Speex.php new file mode 100644 index 00000000..42f9b0eb --- /dev/null +++ b/extensions/TimedMediaHandler/handlers/OggHandler/File_Ogg/File/Ogg/Speex.php @@ -0,0 +1,122 @@ +<?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(); + } +} +?> |