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| 1 | <?php |
| 2 | /* vim: set expandtab tabstop=4 shiftwidth=4: */ |
| 3 | // +----------------------------------------------------------------------------+ |
| 4 | // | File_Ogg PEAR Package for Accessing Ogg Bitstreams | |
| 5 | // | Copyright (c) 2005-2007 | |
| 6 | // | David Grant <david@grant.org.uk> | |
| 7 | // | Tim Starling <tstarling@wikimedia.org> | |
| 8 | // +----------------------------------------------------------------------------+ |
| 9 | // | This library is free software; you can redistribute it and/or | |
| 10 | // | modify it under the terms of the GNU Lesser General Public | |
| 11 | // | License as published by the Free Software Foundation; either | |
| 12 | // | version 2.1 of the License, or (at your option) any later version. | |
| 13 | // | | |
| 14 | // | This library is distributed in the hope that it will be useful, | |
| 15 | // | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 17 | // | Lesser General Public License for more details. | |
| 18 | // | | |
| 19 | // | You should have received a copy of the GNU Lesser General Public | |
| 20 | // | License along with this library; if not, write to the Free Software | |
| 21 | // | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 22 | // +----------------------------------------------------------------------------+ |
| 23 | use MediaWiki\TimedMediaHandler\Handlers\OggHandler\OggException; |
| 24 | |
| 25 | /** |
| 26 | * @author David Grant <david@grant.org.uk>, Tim Starling <tstarling@wikimedia.org> |
| 27 | * @category File |
| 28 | * @copyright David Grant <david@grant.org.uk>, Tim Starling <tstarling@wikimedia.org> |
| 29 | * @license http://www.gnu.org/copyleft/lesser.html GNU LGPL |
| 30 | * @link http://pear.php.net/package/File_Ogg |
| 31 | * @link http://flac.sourceforge.net/documentation.html |
| 32 | * @package File_Ogg |
| 33 | * @version CVS: $Id: Flac.php,v 1.9 2005/11/16 20:43:27 djg Exp $ |
| 34 | */ |
| 35 | class File_Ogg_Flac extends File_Ogg_Media |
| 36 | { |
| 37 | /** |
| 38 | * @access private |
| 39 | * @var string |
| 40 | */ |
| 41 | var $_version; |
| 42 | |
| 43 | /** |
| 44 | * @access private |
| 45 | * @var array |
| 46 | */ |
| 47 | var $_streamInfo; |
| 48 | |
| 49 | /** |
| 50 | * @access private |
| 51 | */ |
| 52 | function __construct($streamSerial, $streamData, $filePointer) |
| 53 | { |
| 54 | parent::__construct($streamSerial, $streamData, $filePointer); |
| 55 | $this->_decodeHeader(); |
| 56 | $this->_decodeCommentsHeader(); |
| 57 | |
| 58 | if ($this->_streamInfo['total_samples'] > 0) { |
| 59 | $this->_streamLength = $this->_streamInfo['total_samples'] |
| 60 | / $this->_streamInfo['sample_rate']; |
| 61 | } else { |
| 62 | // Header may have 0 for total_samples in which case we have to check. |
| 63 | // https://xiph.org/flac/format.html#metadata_block_streaminfo |
| 64 | $endSec = $this->getSecondsFromGranulePos( $this->_lastGranulePos ); |
| 65 | $startSec = $this->getSecondsFromGranulePos( $this->_firstGranulePos ); |
| 66 | |
| 67 | //make sure the offset is worth taking into account oggz_chop related hack |
| 68 | if( $startSec > 1) { |
| 69 | $this->_streamLength = $endSec - $startSec; |
| 70 | $this->_startOffset = $startSec; |
| 71 | } else { |
| 72 | $this->_streamLength = $endSec; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | $this->_avgBitrate = $this->_streamLength ? ($this->_streamSize * 8) / $this->_streamLength : 0; |
| 77 | } |
| 78 | |
| 79 | function getSecondsFromGranulePos( $granulePos ){ |
| 80 | return (intval(substr( $granulePos, 0, 8 ), 16 ) * pow(2, 32) |
| 81 | + intval(substr( $granulePos, 8, 8 ), 16 )) |
| 82 | / $this->_streamInfo['sample_rate']; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Get a short string describing the type of the stream |
| 87 | * @return string |
| 88 | */ |
| 89 | function getType() { |
| 90 | return 'FLAC'; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @access private |
| 95 | */ |
| 96 | function _decodeHeader() |
| 97 | { |
| 98 | fseek($this->_filePointer, $this->_streamData['pages'][0]['body_offset'], SEEK_SET); |
| 99 | // Check if this is the correct header. |
| 100 | $packet = unpack("Cdata", fread($this->_filePointer, 1)); |
| 101 | if ($packet['data'] != 0x7f) |
| 102 | throw new OggException("Stream Undecodable", OGG_ERROR_UNDECODABLE); |
| 103 | |
| 104 | // The following four characters should be "FLAC". |
| 105 | if (fread($this->_filePointer, 4) != 'FLAC') |
| 106 | throw new OggException("Stream is undecodable due to a malformed header.", OGG_ERROR_UNDECODABLE); |
| 107 | |
| 108 | $version = unpack("Cmajor/Cminor", fread($this->_filePointer, 2)); |
| 109 | $this->_version = "{$version['major']}.{$version['minor']}"; |
| 110 | if ($version['major'] > 1) { |
| 111 | throw new OggException("Cannot decode a version {$version['major']} FLAC stream", OGG_ERROR_UNDECODABLE); |
| 112 | } |
| 113 | $h = File_Ogg::_readBigEndian( $this->_filePointer, |
| 114 | array( |
| 115 | // Ogg-specific |
| 116 | 'num_headers' => 16, |
| 117 | 'flac_native_sig' => 32, |
| 118 | // METADATA_BLOCK_HEADER |
| 119 | 'is_last' => 1, |
| 120 | 'type' => 7, |
| 121 | 'length' => 24, |
| 122 | )); |
| 123 | |
| 124 | // METADATA_BLOCK_STREAMINFO |
| 125 | // The variable names are canonical, and come from the FLAC source (format.h) |
| 126 | $this->_streamInfo = File_Ogg::_readBigEndian( $this->_filePointer, |
| 127 | array( |
| 128 | 'min_blocksize' => 16, |
| 129 | 'max_blocksize' => 16, |
| 130 | 'min_framesize' => 24, |
| 131 | 'max_framesize' => 24, |
| 132 | 'sample_rate' => 20, |
| 133 | 'channels' => 3, |
| 134 | 'bits_per_sample' => 5, |
| 135 | 'total_samples' => 36, |
| 136 | )); |
| 137 | $this->_streamInfo['md5sum'] = bin2hex(fread($this->_filePointer, 16)); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Get an associative array containing header information about the stream |
| 142 | * @access public |
| 143 | * @return array |
| 144 | */ |
| 145 | function getHeader() |
| 146 | { |
| 147 | return $this->_streamInfo; |
| 148 | } |
| 149 | |
| 150 | function _decodeCommentsHeader() |
| 151 | { |
| 152 | fseek($this->_filePointer, $this->_streamData['pages'][1]['body_offset'], SEEK_SET); |
| 153 | $blockHeader = File_Ogg::_readBigEndian( $this->_filePointer, |
| 154 | array( |
| 155 | 'last_block' => 1, |
| 156 | 'block_type' => 7, |
| 157 | 'length' => 24 |
| 158 | ) |
| 159 | ); |
| 160 | if ($blockHeader['block_type'] != 4) { |
| 161 | throw new OggException("Stream Undecodable", OGG_ERROR_UNDECODABLE); |
| 162 | } |
| 163 | |
| 164 | $this->_decodeBareCommentsHeader(); |
| 165 | } |
| 166 | } |
| 167 | ?> |