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[autoinstallsdev/mediawiki.git] / vendor / james-heinrich / getid3 / getid3 / module.audio.lpac.php

diff --git a/vendor/james-heinrich/getid3/getid3/module.audio.lpac.php b/vendor/james-heinrich/getid3/getid3/module.audio.lpac.php
new file mode 100644 (file)
index 0000000..447cc2d
--- /dev/null
+++ b/vendor/james-heinrich/getid3/getid3/module.audio.lpac.php
@@ -0,0 +1,128 @@
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org>               //
+//  available at http://getid3.sourceforge.net                 //
+//            or http://www.getid3.org                         //
+//          also https://github.com/JamesHeinrich/getID3       //
+/////////////////////////////////////////////////////////////////
+// See readme.txt for more details                             //
+/////////////////////////////////////////////////////////////////
+//                                                             //
+// module.audio.lpac.php                                       //
+// module for analyzing LPAC Audio files                       //
+// dependencies: module.audio-video.riff.php                   //
+//                                                            ///
+/////////////////////////////////////////////////////////////////
+
+getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
+
+class getid3_lpac extends getid3_handler
+{
+
+       public function Analyze() {
+               $info = &$this->getid3->info;
+
+               $this->fseek($info['avdataoffset']);
+               $LPACheader = $this->fread(14);
+               if (substr($LPACheader, 0, 4) != 'LPAC') {
+                       $this->error('Expected "LPAC" at offset '.$info['avdataoffset'].', found "'.$StreamMarker.'"');
+                       return false;
+               }
+               $info['avdataoffset'] += 14;
+
+               $info['fileformat']            = 'lpac';
+               $info['audio']['dataformat']   = 'lpac';
+               $info['audio']['lossless']     = true;
+               $info['audio']['bitrate_mode'] = 'vbr';
+
+               $info['lpac']['file_version'] = getid3_lib::BigEndian2Int(substr($LPACheader,  4, 1));
+               $flags['audio_type']                  = getid3_lib::BigEndian2Int(substr($LPACheader,  5, 1));
+               $info['lpac']['total_samples']= getid3_lib::BigEndian2Int(substr($LPACheader,  6, 4));
+               $flags['parameters']                  = getid3_lib::BigEndian2Int(substr($LPACheader, 10, 4));
+
+               $info['lpac']['flags']['is_wave'] = (bool) ($flags['audio_type'] & 0x40);
+               $info['lpac']['flags']['stereo']  = (bool) ($flags['audio_type'] & 0x04);
+               $info['lpac']['flags']['24_bit']  = (bool) ($flags['audio_type'] & 0x02);
+               $info['lpac']['flags']['16_bit']  = (bool) ($flags['audio_type'] & 0x01);
+
+               if ($info['lpac']['flags']['24_bit'] && $info['lpac']['flags']['16_bit']) {
+                       $this->warning('24-bit and 16-bit flags cannot both be set');
+               }
+
+               $info['lpac']['flags']['fast_compress']             =  (bool) ($flags['parameters'] & 0x40000000);
+               $info['lpac']['flags']['random_access']             =  (bool) ($flags['parameters'] & 0x08000000);
+               $info['lpac']['block_length']                       = pow(2, (($flags['parameters'] & 0x07000000) >> 24)) * 256;
+               $info['lpac']['flags']['adaptive_prediction_order'] =  (bool) ($flags['parameters'] & 0x00800000);
+               $info['lpac']['flags']['adaptive_quantization']     =  (bool) ($flags['parameters'] & 0x00400000);
+               $info['lpac']['flags']['joint_stereo']              =  (bool) ($flags['parameters'] & 0x00040000);
+               $info['lpac']['quantization']                       =         ($flags['parameters'] & 0x00001F00) >> 8;
+               $info['lpac']['max_prediction_order']               =         ($flags['parameters'] & 0x0000003F);
+
+               if ($info['lpac']['flags']['fast_compress'] && ($info['lpac']['max_prediction_order'] != 3)) {
+                       $this->warning('max_prediction_order expected to be "3" if fast_compress is true, actual value is "'.$info['lpac']['max_prediction_order'].'"');
+               }
+               switch ($info['lpac']['file_version']) {
+                       case 6:
+                               if ($info['lpac']['flags']['adaptive_quantization']) {
+                                       $this->warning('adaptive_quantization expected to be false in LPAC file stucture v6, actually true');
+                               }
+                               if ($info['lpac']['quantization'] != 20) {
+                                       $this->warning('Quantization expected to be 20 in LPAC file stucture v6, actually '.$info['lpac']['flags']['Q']);
+                               }
+                               break;
+
+                       default:
+                               //$this->warning('This version of getID3() ['.$this->getid3->version().'] only supports LPAC file format version 6, this file is version '.$info['lpac']['file_version'].' - please report to info@getid3.org');
+                               break;
+               }
+
+               $getid3_temp = new getID3();
+               $getid3_temp->openfile($this->getid3->filename);
+               $getid3_temp->info = $info;
+               $getid3_riff = new getid3_riff($getid3_temp);
+               $getid3_riff->Analyze();
+               $info['avdataoffset']                = $getid3_temp->info['avdataoffset'];
+               $info['riff']                        = $getid3_temp->info['riff'];
+               $info['error']                       = $getid3_temp->info['error'];
+               $info['warning']                     = $getid3_temp->info['warning'];
+               $info['lpac']['comments']['comment'] = $getid3_temp->info['comments'];
+               $info['audio']['sample_rate']        = $getid3_temp->info['audio']['sample_rate'];
+               unset($getid3_temp, $getid3_riff);
+
+               $info['audio']['channels']    = ($info['lpac']['flags']['stereo'] ? 2 : 1);
+
+               if ($info['lpac']['flags']['24_bit']) {
+                       $info['audio']['bits_per_sample'] = $info['riff']['audio'][0]['bits_per_sample'];
+               } elseif ($info['lpac']['flags']['16_bit']) {
+                       $info['audio']['bits_per_sample'] = 16;
+               } else {
+                       $info['audio']['bits_per_sample'] = 8;
+               }
+
+               if ($info['lpac']['flags']['fast_compress']) {
+                        // fast
+                       $info['audio']['encoder_options'] = '-1';
+               } else {
+                       switch ($info['lpac']['max_prediction_order']) {
+                               case 20: // simple
+                                       $info['audio']['encoder_options'] = '-2';
+                                       break;
+                               case 30: // medium
+                                       $info['audio']['encoder_options'] = '-3';
+                                       break;
+                               case 40: // high
+                                       $info['audio']['encoder_options'] = '-4';
+                                       break;
+                               case 60: // extrahigh
+                                       $info['audio']['encoder_options'] = '-5';
+                                       break;
+                       }
+               }
+
+               $info['playtime_seconds'] = $info['lpac']['total_samples'] / $info['audio']['sample_rate'];
+               $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
+
+               return true;
+       }
+
+}