447cc2d6dc1ed6281eebab393fea493f78250bdd
2 /////////////////////////////////////////////////////////////////
3 /// getID3() by James Heinrich <info@getid3.org> //
4 // available at http://getid3.sourceforge.net //
5 // or http://www.getid3.org //
6 // also https://github.com/JamesHeinrich/getID3 //
7 /////////////////////////////////////////////////////////////////
8 // See readme.txt for more details //
9 /////////////////////////////////////////////////////////////////
11 // module.audio.lpac.php //
12 // module for analyzing LPAC Audio files //
13 // dependencies: module.audio-video.riff.php //
15 /////////////////////////////////////////////////////////////////
17 getid3_lib
::IncludeDependency(GETID3_INCLUDEPATH
.'module.audio-video.riff.php', __FILE__
, true);
19 class getid3_lpac
extends getid3_handler
22 public function Analyze() {
23 $info = &$this->getid3
->info
;
25 $this->fseek($info['avdataoffset']);
26 $LPACheader = $this->fread(14);
27 if (substr($LPACheader, 0, 4) != 'LPAC') {
28 $this->error('Expected "LPAC" at offset '.$info['avdataoffset'].', found "'.$StreamMarker.'"');
31 $info['avdataoffset'] +
= 14;
33 $info['fileformat'] = 'lpac';
34 $info['audio']['dataformat'] = 'lpac';
35 $info['audio']['lossless'] = true;
36 $info['audio']['bitrate_mode'] = 'vbr';
38 $info['lpac']['file_version'] = getid3_lib
::BigEndian2Int(substr($LPACheader, 4, 1));
39 $flags['audio_type'] = getid3_lib
::BigEndian2Int(substr($LPACheader, 5, 1));
40 $info['lpac']['total_samples']= getid3_lib
::BigEndian2Int(substr($LPACheader, 6, 4));
41 $flags['parameters'] = getid3_lib
::BigEndian2Int(substr($LPACheader, 10, 4));
43 $info['lpac']['flags']['is_wave'] = (bool) ($flags['audio_type'] & 0x40);
44 $info['lpac']['flags']['stereo'] = (bool) ($flags['audio_type'] & 0x04);
45 $info['lpac']['flags']['24_bit'] = (bool) ($flags['audio_type'] & 0x02);
46 $info['lpac']['flags']['16_bit'] = (bool) ($flags['audio_type'] & 0x01);
48 if ($info['lpac']['flags']['24_bit'] && $info['lpac']['flags']['16_bit']) {
49 $this->warning('24-bit and 16-bit flags cannot both be set');
52 $info['lpac']['flags']['fast_compress'] = (bool) ($flags['parameters'] & 0x40000000);
53 $info['lpac']['flags']['random_access'] = (bool) ($flags['parameters'] & 0x08000000);
54 $info['lpac']['block_length'] = pow(2, (($flags['parameters'] & 0x07000000) >> 24)) * 256;
55 $info['lpac']['flags']['adaptive_prediction_order'] = (bool) ($flags['parameters'] & 0x00800000);
56 $info['lpac']['flags']['adaptive_quantization'] = (bool) ($flags['parameters'] & 0x00400000);
57 $info['lpac']['flags']['joint_stereo'] = (bool) ($flags['parameters'] & 0x00040000);
58 $info['lpac']['quantization'] = ($flags['parameters'] & 0x00001F00) >> 8;
59 $info['lpac']['max_prediction_order'] = ($flags['parameters'] & 0x0000003F);
61 if ($info['lpac']['flags']['fast_compress'] && ($info['lpac']['max_prediction_order'] != 3)) {
62 $this->warning('max_prediction_order expected to be "3" if fast_compress is true, actual value is "'.$info['lpac']['max_prediction_order'].'"');
64 switch ($info['lpac']['file_version']) {
66 if ($info['lpac']['flags']['adaptive_quantization']) {
67 $this->warning('adaptive_quantization expected to be false in LPAC file stucture v6, actually true');
69 if ($info['lpac']['quantization'] != 20) {
70 $this->warning('Quantization expected to be 20 in LPAC file stucture v6, actually '.$info['lpac']['flags']['Q']);
75 //$this->warning('This version of getID3() ['.$this->getid3->version().'] only supports LPAC file format version 6, this file is version '.$info['lpac']['file_version'].' - please report to info@getid3.org');
79 $getid3_temp = new getID3();
80 $getid3_temp->openfile($this->getid3
->filename
);
81 $getid3_temp->info
= $info;
82 $getid3_riff = new getid3_riff($getid3_temp);
83 $getid3_riff->Analyze();
84 $info['avdataoffset'] = $getid3_temp->info
['avdataoffset'];
85 $info['riff'] = $getid3_temp->info
['riff'];
86 $info['error'] = $getid3_temp->info
['error'];
87 $info['warning'] = $getid3_temp->info
['warning'];
88 $info['lpac']['comments']['comment'] = $getid3_temp->info
['comments'];
89 $info['audio']['sample_rate'] = $getid3_temp->info
['audio']['sample_rate'];
90 unset($getid3_temp, $getid3_riff);
92 $info['audio']['channels'] = ($info['lpac']['flags']['stereo'] ?
2 : 1);
94 if ($info['lpac']['flags']['24_bit']) {
95 $info['audio']['bits_per_sample'] = $info['riff']['audio'][0]['bits_per_sample'];
96 } elseif ($info['lpac']['flags']['16_bit']) {
97 $info['audio']['bits_per_sample'] = 16;
99 $info['audio']['bits_per_sample'] = 8;
102 if ($info['lpac']['flags']['fast_compress']) {
104 $info['audio']['encoder_options'] = '-1';
106 switch ($info['lpac']['max_prediction_order']) {
108 $info['audio']['encoder_options'] = '-2';
111 $info['audio']['encoder_options'] = '-3';
114 $info['audio']['encoder_options'] = '-4';
116 case 60: // extrahigh
117 $info['audio']['encoder_options'] = '-5';
122 $info['playtime_seconds'] = $info['lpac']['total_samples'] / $info['audio']['sample_rate'];
123 $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];