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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| <?php | ||
| /* vim: set expandtab tabstop=4 shiftwidth=4: */ | ||
| // +----------------------------------------------------------------------------+ | ||
| // | File_Ogg PEAR Package for Accessing Ogg Bitstreams | | ||
| // | Copyright (c) 2013 | | ||
| // | Jan Gerber <jgerber@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 | | ||
| // +----------------------------------------------------------------------------+ | ||
|
|
||
| require_once('File/Ogg/Media.php'); | ||
|
|
||
| define( 'OGG_OPUS_COMMENTS_PAGE_OFFSET', 1 ); | ||
|
|
||
| /** | ||
| * @author Jan Gerber <jgerber@wikimedia.org> | ||
| * @category File | ||
| * @copyright Jan Gerber <jgerber@wikimedia.org> | ||
| * @license http://www.gnu.org/copyleft/lesser.html GNU LGPL | ||
| * @link http://pear.php.net/package/File_Ogg | ||
| * @link http://www.opus-codec.org/ | ||
| * @package File_Ogg | ||
| * @version 1 | ||
| */ | ||
| class File_Ogg_Opus extends File_Ogg_Media | ||
| { | ||
| /** | ||
| * @access private | ||
| */ | ||
| function __construct($streamSerial, $streamData, $filePointer) | ||
| { | ||
| parent::__construct($streamSerial, $streamData, $filePointer); | ||
| $this->_decodeHeader(); | ||
| $this->_decodeCommentsHeader(); | ||
|
|
||
| $endSec = $this->getSecondsFromGranulePos( $this->_lastGranulePos ); | ||
| $startSec = $this->getSecondsFromGranulePos( $this->_firstGranulePos ); | ||
|
|
||
| if( $startSec > 1){ | ||
| $this->_streamLength = $endSec - $startSec; | ||
| $this->_startOffset = $startSec; | ||
| }else{ | ||
| $this->_streamLength = $endSec; | ||
| } | ||
| $this->_avgBitrate = $this->_streamLength ? ($this->_streamSize * 8) / $this->_streamLength : 0; | ||
| } | ||
|
|
||
| function getSecondsFromGranulePos( $granulePos ){ | ||
| return (( '0x' . substr( $granulePos, 0, 8 ) ) * pow(2, 32) | ||
| + ( '0x' . substr( $granulePos, 8, 8 ) ) | ||
| - $this->_header['pre_skip']) | ||
| / 48000; | ||
| } | ||
|
|
||
| /** | ||
| * Get a short string describing the type of the stream | ||
| * @return string | ||
| */ | ||
| function getType() | ||
| { | ||
| return 'Opus'; | ||
| } | ||
|
|
||
| /** | ||
| * Decode the stream header | ||
| * @access private | ||
| */ | ||
| function _decodeHeader() | ||
| { | ||
| fseek($this->_filePointer, $this->_streamData['pages'][0]['body_offset'], SEEK_SET); | ||
| // The first 8 characters should be "OpusHead". | ||
| if (fread($this->_filePointer, 8) != 'OpusHead') | ||
| throw new PEAR_Exception("Stream is undecodable due to a malformed header.", OGG_ERROR_UNDECODABLE); | ||
|
|
||
| $this->_header = File_Ogg::_readLittleEndian($this->_filePointer, array( | ||
| 'opus_version' => 8, | ||
| 'nb_channels' => 8, | ||
| 'pre_skip' => 16, | ||
| 'audio_sample_rate' => 32, | ||
| 'output_gain' => 16, | ||
| 'channel_mapping_family'=> 8, | ||
| )); | ||
| $this->_channels = $this->_header['nb_channels']; | ||
| } | ||
|
|
||
| /** | ||
| * Get an associative array containing header information about the stream | ||
| * @access public | ||
| * @return array | ||
| */ | ||
| function getHeader() { | ||
| return $this->_header; | ||
| } | ||
|
|
||
| function getSampleRate() | ||
| { | ||
| //Opus always outputs 48kHz, the header only lists | ||
| //the samplerate of the source as reference | ||
| return 48000; | ||
| } | ||
|
|
||
| /** | ||
| * Decode the comments header | ||
| * @access private | ||
| */ | ||
| function _decodeCommentsHeader() | ||
| { | ||
| $id = 'OpusTags'; | ||
| $this->_decodeCommonHeader(false, OGG_OPUS_COMMENTS_PAGE_OFFSET); | ||
| if(fread($this->_filePointer, strlen($id)) !== $id) | ||
| throw new PEAR_Exception("Stream is undecodable due to a malformed header.", OGG_ERROR_UNDECODABLE); | ||
| $this->_decodeBareCommentsHeader(); | ||
| } | ||
| } | ||
| ?> |
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