ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
Public Member Functions
getid3_lpac Class Reference
+ Inheritance diagram for getid3_lpac:
+ Collaboration diagram for getid3_lpac:

Public Member Functions

 getid3_lpac (&$fd, &$ThisFileInfo)
 
 Analyze ()
 
- Public Member Functions inherited from getid3_handler
 __construct (getID3 $getid3, $call_module=null)
 
 Analyze ()
 
 AnalyzeString ($string)
 
 setStringMode ($string)
 
 saveAttachment ($name, $offset, $length, $image_mime=null)
 

Additional Inherited Members

- Protected Member Functions inherited from getid3_handler
 ftell ()
 
 fread ($bytes)
 
 fseek ($bytes, $whence=SEEK_SET)
 
 feof ()
 
 isDependencyFor ($module)
 
 error ($text)
 
 warning ($text)
 
 notice ($text)
 
- Protected Attributes inherited from getid3_handler
 $getid3
 
 $data_string_flag = false
 
 $data_string = ''
 
 $data_string_position = 0
 
 $data_string_length = 0
 

Detailed Description

Definition at line 18 of file module.audio.lpac.php.

Member Function Documentation

◆ Analyze()

getid3_lpac::Analyze ( )

Definition at line 22 of file module.audio.lpac.php.

References $info, getid3_lib\BigEndian2Int(), getid3_handler\fread(), and getid3_handler\fseek().

22  {
23  $info = &$this->getid3->info;
24 
25  $this->fseek($info['avdataoffset']);
26  $LPACheader = $this->fread(14);
27  if (substr($LPACheader, 0, 4) != 'LPAC') {
28  $info['error'][] = 'Expected "LPAC" at offset '.$info['avdataoffset'].', found "'.$StreamMarker.'"';
29  return false;
30  }
31  $info['avdataoffset'] += 14;
32 
33  $info['fileformat'] = 'lpac';
34  $info['audio']['dataformat'] = 'lpac';
35  $info['audio']['lossless'] = true;
36  $info['audio']['bitrate_mode'] = 'vbr';
37 
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));
42 
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);
47 
48  if ($info['lpac']['flags']['24_bit'] && $info['lpac']['flags']['16_bit']) {
49  $info['warning'][] = '24-bit and 16-bit flags cannot both be set';
50  }
51 
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);
60 
61  if ($info['lpac']['flags']['fast_compress'] && ($info['lpac']['max_prediction_order'] != 3)) {
62  $info['warning'][] = 'max_prediction_order expected to be "3" if fast_compress is true, actual value is "'.$info['lpac']['max_prediction_order'].'"';
63  }
64  switch ($info['lpac']['file_version']) {
65  case 6:
66  if ($info['lpac']['flags']['adaptive_quantization']) {
67  $info['warning'][] = 'adaptive_quantization expected to be false in LPAC file stucture v6, actually true';
68  }
69  if ($info['lpac']['quantization'] != 20) {
70  $info['warning'][] = 'Quantization expected to be 20 in LPAC file stucture v6, actually '.$info['lpac']['flags']['Q'];
71  }
72  break;
73 
74  default:
75  //$info['warning'][] = 'This version of getID3() ['.$this->getid3->version().'] only supports LPAC file format version 6, this file is version '.$info['lpac']['file_version'].' - please report to info@getid3.org';
76  break;
77  }
78 
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);
91 
92  $info['audio']['channels'] = ($info['lpac']['flags']['stereo'] ? 2 : 1);
93 
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;
98  } else {
99  $info['audio']['bits_per_sample'] = 8;
100  }
101 
102  if ($info['lpac']['flags']['fast_compress']) {
103  // fast
104  $info['audio']['encoder_options'] = '-1';
105  } else {
106  switch ($info['lpac']['max_prediction_order']) {
107  case 20: // simple
108  $info['audio']['encoder_options'] = '-2';
109  break;
110  case 30: // medium
111  $info['audio']['encoder_options'] = '-3';
112  break;
113  case 40: // high
114  $info['audio']['encoder_options'] = '-4';
115  break;
116  case 60: // extrahigh
117  $info['audio']['encoder_options'] = '-5';
118  break;
119  }
120  }
121 
122  $info['playtime_seconds'] = $info['lpac']['total_samples'] / $info['audio']['sample_rate'];
123  $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
124 
125  return true;
126  }
$info
$info
Definition: example_052.php:80
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_lib\BigEndian2Int
BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: getid3.lib.php:234
getid3_riff
Definition: module.audio-video.riff.php:21
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
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◆ getid3_lpac()

getid3_lpac::getid3_lpac ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 21 of file module.audio.lpac.php.

References getid3_lib\BigEndian2Int(), getid3_handler\fread(), and getid3_handler\fseek().

21  {
22 
23  fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
24  $LPACheader = fread($fd, 14);
25  if (substr($LPACheader, 0, 4) != 'LPAC') {
26  $ThisFileInfo['error'][] = 'Expected "LPAC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$StreamMarker.'"';
27  return false;
28  }
29  $ThisFileInfo['avdataoffset'] += 14;
30 
31  $ThisFileInfo['fileformat'] = 'lpac';
32  $ThisFileInfo['audio']['dataformat'] = 'lpac';
33  $ThisFileInfo['audio']['lossless'] = true;
34  $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
35 
36  $ThisFileInfo['lpac']['file_version'] = getid3_lib::BigEndian2Int(substr($LPACheader, 4, 1));
37  $flags['audio_type'] = getid3_lib::BigEndian2Int(substr($LPACheader, 5, 1));
38  $ThisFileInfo['lpac']['total_samples']= getid3_lib::BigEndian2Int(substr($LPACheader, 6, 4));
39  $flags['parameters'] = getid3_lib::BigEndian2Int(substr($LPACheader, 10, 4));
40 
41  $ThisFileInfo['lpac']['flags']['is_wave'] = (bool) ($flags['audio_type'] & 0x40);
42  $ThisFileInfo['lpac']['flags']['stereo'] = (bool) ($flags['audio_type'] & 0x04);
43  $ThisFileInfo['lpac']['flags']['24_bit'] = (bool) ($flags['audio_type'] & 0x02);
44  $ThisFileInfo['lpac']['flags']['16_bit'] = (bool) ($flags['audio_type'] & 0x01);
45 
46  if ($ThisFileInfo['lpac']['flags']['24_bit'] && $ThisFileInfo['lpac']['flags']['16_bit']) {
47  $ThisFileInfo['warning'][] = '24-bit and 16-bit flags cannot both be set';
48  }
49 
50  $ThisFileInfo['lpac']['flags']['fast_compress'] = (bool) ($flags['parameters'] & 0x40000000);
51  $ThisFileInfo['lpac']['flags']['random_access'] = (bool) ($flags['parameters'] & 0x08000000);
52  $ThisFileInfo['lpac']['block_length'] = pow(2, (($flags['parameters'] & 0x07000000) >> 24)) * 256;
53  $ThisFileInfo['lpac']['flags']['adaptive_prediction_order'] = (bool) ($flags['parameters'] & 0x00800000);
54  $ThisFileInfo['lpac']['flags']['adaptive_quantization'] = (bool) ($flags['parameters'] & 0x00400000);
55  $ThisFileInfo['lpac']['flags']['joint_stereo'] = (bool) ($flags['parameters'] & 0x00040000);
56  $ThisFileInfo['lpac']['quantization'] = ($flags['parameters'] & 0x00001F00) >> 8;
57  $ThisFileInfo['lpac']['max_prediction_order'] = ($flags['parameters'] & 0x0000003F);
58 
59  if ($ThisFileInfo['lpac']['flags']['fast_compress'] && ($ThisFileInfo['lpac']['max_prediction_order'] != 3)) {
60  $ThisFileInfo['warning'][] = 'max_prediction_order expected to be "3" if fast_compress is true, actual value is "'.$ThisFileInfo['lpac']['max_prediction_order'].'"';
61  }
62  switch ($ThisFileInfo['lpac']['file_version']) {
63  case 6:
64  if ($ThisFileInfo['lpac']['flags']['adaptive_quantization']) {
65  $ThisFileInfo['warning'][] = 'adaptive_quantization expected to be false in LPAC file stucture v6, actually true';
66  }
67  if ($ThisFileInfo['lpac']['quantization'] != 20) {
68  $ThisFileInfo['warning'][] = 'Quantization expected to be 20 in LPAC file stucture v6, actually '.$ThisFileInfo['lpac']['flags']['Q'];
69  }
70  break;
71 
72  default:
73  //$ThisFileInfo['warning'][] = 'This version of getID3() only supports LPAC file format version 6, this file is version '.$ThisFileInfo['lpac']['file_version'].' - please report to info@getid3.org';
74  break;
75  }
76 
77  $dummy = $ThisFileInfo;
78  $riff = new getid3_riff($fd, $dummy);
79  $ThisFileInfo['avdataoffset'] = $dummy['avdataoffset'];
80  $ThisFileInfo['riff'] = $dummy['riff'];
81  $ThisFileInfo['error'] = $dummy['error'];
82  $ThisFileInfo['warning'] = $dummy['warning'];
83  $ThisFileInfo['lpac']['comments']['comment'] = $dummy['comments'];
84  $ThisFileInfo['audio']['sample_rate'] = $dummy['audio']['sample_rate'];
85 
86  $ThisFileInfo['audio']['channels'] = ($ThisFileInfo['lpac']['flags']['stereo'] ? 2 : 1);
87 
88  if ($ThisFileInfo['lpac']['flags']['24_bit']) {
89  $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['riff']['audio'][0]['bits_per_sample'];
90  } elseif ($ThisFileInfo['lpac']['flags']['16_bit']) {
91  $ThisFileInfo['audio']['bits_per_sample'] = 16;
92  } else {
93  $ThisFileInfo['audio']['bits_per_sample'] = 8;
94  }
95 
96  if ($ThisFileInfo['lpac']['flags']['fast_compress']) {
97  // fast
98  $ThisFileInfo['audio']['encoder_options'] = '-1';
99  } else {
100  switch ($ThisFileInfo['lpac']['max_prediction_order']) {
101  case 20: // simple
102  $ThisFileInfo['audio']['encoder_options'] = '-2';
103  break;
104  case 30: // medium
105  $ThisFileInfo['audio']['encoder_options'] = '-3';
106  break;
107  case 40: // high
108  $ThisFileInfo['audio']['encoder_options'] = '-4';
109  break;
110  case 60: // extrahigh
111  $ThisFileInfo['audio']['encoder_options'] = '-5';
112  break;
113  }
114  }
115 
116  $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['lpac']['total_samples'] / $ThisFileInfo['audio']['sample_rate'];
117  $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
118 
119  return true;
120  }
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_lib\BigEndian2Int
BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: getid3.lib.php:234
getid3_riff
Definition: module.audio-video.riff.php:21
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
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The documentation for this class was generated from the following file: