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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) 2013 | |
| 6 | // | Jan Gerber <jgerber@wikimedia.org> | |
| 7 | // +----------------------------------------------------------------------------+ |
| 8 | // | This library is free software; you can redistribute it and/or | |
| 9 | // | modify it under the terms of the GNU Lesser General Public | |
| 10 | // | License as published by the Free Software Foundation; either | |
| 11 | // | version 2.1 of the License, or (at your option) any later version. | |
| 12 | // | | |
| 13 | // | This library is distributed in the hope that it will be useful, | |
| 14 | // | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 | // | Lesser General Public License for more details. | |
| 17 | // | | |
| 18 | // | You should have received a copy of the GNU Lesser General Public | |
| 19 | // | License along with this library; if not, write to the Free Software | |
| 20 | // | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 21 | // +----------------------------------------------------------------------------+ |
| 22 | |
| 23 | use MediaWiki\TimedMediaHandler\Handlers\OggHandler\OggException; |
| 24 | |
| 25 | define( 'OGG_OPUS_COMMENTS_PAGE_OFFSET', 1 ); |
| 26 | |
| 27 | /** |
| 28 | * @author Jan Gerber <jgerber@wikimedia.org> |
| 29 | * @category File |
| 30 | * @copyright Jan Gerber <jgerber@wikimedia.org> |
| 31 | * @license http://www.gnu.org/copyleft/lesser.html GNU LGPL |
| 32 | * @link http://pear.php.net/package/File_Ogg |
| 33 | * @link http://www.opus-codec.org/ |
| 34 | * @package File_Ogg |
| 35 | * @version 1 |
| 36 | */ |
| 37 | class File_Ogg_Opus extends File_Ogg_Media |
| 38 | { |
| 39 | /** |
| 40 | * The Opus audio header |
| 41 | * https://www.opus-codec.org/docs/opusfile_api-0.7/structOpusHead.html |
| 42 | * |
| 43 | * @var array |
| 44 | * @access private |
| 45 | */ |
| 46 | var $_header; |
| 47 | |
| 48 | /** |
| 49 | * Number of audio channels in the stream |
| 50 | * |
| 51 | * @var int |
| 52 | * @access private |
| 53 | */ |
| 54 | var $_channels; |
| 55 | |
| 56 | /** |
| 57 | * @access private |
| 58 | */ |
| 59 | function __construct($streamSerial, $streamData, $filePointer) |
| 60 | { |
| 61 | parent::__construct($streamSerial, $streamData, $filePointer); |
| 62 | $this->_decodeHeader(); |
| 63 | $this->_decodeCommentsHeader(); |
| 64 | |
| 65 | $endSec = $this->getSecondsFromGranulePos( $this->_lastGranulePos ); |
| 66 | $startSec = $this->getSecondsFromGranulePos( $this->_firstGranulePos ); |
| 67 | |
| 68 | if( $startSec > 1){ |
| 69 | $this->_streamLength = $endSec - $startSec; |
| 70 | $this->_startOffset = $startSec; |
| 71 | }else{ |
| 72 | $this->_streamLength = $endSec; |
| 73 | } |
| 74 | $this->_avgBitrate = $this->_streamLength ? ($this->_streamSize * 8) / $this->_streamLength : 0; |
| 75 | } |
| 76 | |
| 77 | function getSecondsFromGranulePos( $granulePos ){ |
| 78 | return (intval(substr( $granulePos, 0, 8 ), 16 ) * pow(2, 32) |
| 79 | + intval(substr( $granulePos, 8, 8 ), 16 ) |
| 80 | - $this->_header['pre_skip']) |
| 81 | / 48000; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Get a short string describing the type of the stream |
| 86 | * @return string |
| 87 | */ |
| 88 | function getType() |
| 89 | { |
| 90 | return 'Opus'; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Decode the stream header |
| 95 | * @access private |
| 96 | */ |
| 97 | function _decodeHeader() |
| 98 | { |
| 99 | fseek($this->_filePointer, $this->_streamData['pages'][0]['body_offset'], SEEK_SET); |
| 100 | // The first 8 characters should be "OpusHead". |
| 101 | if (fread($this->_filePointer, 8) != 'OpusHead') |
| 102 | throw new OggException("Stream is undecodable due to a malformed header.", OGG_ERROR_UNDECODABLE); |
| 103 | |
| 104 | $this->_header = File_Ogg::_readLittleEndian($this->_filePointer, array( |
| 105 | 'opus_version' => 8, |
| 106 | 'nb_channels' => 8, |
| 107 | 'pre_skip' => 16, |
| 108 | 'audio_sample_rate' => 32, |
| 109 | 'output_gain' => 16, |
| 110 | 'channel_mapping_family'=> 8, |
| 111 | )); |
| 112 | $this->_channels = $this->_header['nb_channels']; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Get an associative array containing header information about the stream |
| 117 | * @access public |
| 118 | * @return array |
| 119 | */ |
| 120 | function getHeader() { |
| 121 | return $this->_header; |
| 122 | } |
| 123 | |
| 124 | function getSampleRate() |
| 125 | { |
| 126 | //Opus always outputs 48kHz, the header only lists |
| 127 | //the samplerate of the source as reference |
| 128 | return 48000; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Decode the comments header |
| 133 | * @access private |
| 134 | */ |
| 135 | function _decodeCommentsHeader() |
| 136 | { |
| 137 | $id = 'OpusTags'; |
| 138 | $this->_decodeCommonHeader(false, OGG_OPUS_COMMENTS_PAGE_OFFSET); |
| 139 | if(fread($this->_filePointer, strlen($id)) !== $id) |
| 140 | throw new OggException("Stream is undecodable due to a malformed header.", OGG_ERROR_UNDECODABLE); |
| 141 | $this->_decodeBareCommentsHeader(); |
| 142 | } |
| 143 | } |
| 144 | ?> |