ILIAS  release_5-3 Revision v5.3.23-19-g915713cf615
Public Member Functions | Static Public Member Functions
getid3_dsf Class Reference
+ Inheritance diagram for getid3_dsf:
+ Collaboration diagram for getid3_dsf:

Public Member Functions

 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)
 

Static Public Member Functions

static DSFchannelTypeLookup ($channel_type_id)
 

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 19 of file module.audio.dsf.php.

Member Function Documentation

◆ Analyze()

getid3_dsf::Analyze ( )

Reimplemented from getid3_handler.

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

22 {
23 $info = &$this->getid3->info;
24
25 $info['fileformat'] = 'dsf';
26 $info['audio']['dataformat'] = 'dsf';
27 $info['audio']['lossless'] = true;
28 $info['audio']['bitrate_mode'] = 'cbr';
29
30 $this->fseek($info['avdataoffset']);
31 $dsfheader = $this->fread(28 + 12);
32
33 $headeroffset = 0;
34 $info['dsf']['dsd']['magic'] = substr($dsfheader, $headeroffset, 4);
35 $headeroffset += 4;
36 $magic = 'DSD ';
37 if ($info['dsf']['dsd']['magic'] != $magic) {
38 $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['dsf']['dsd']['magic']).'"');
39 unset($info['fileformat']);
40 unset($info['audio']);
41 unset($info['dsf']);
42 return false;
43 }
44 $info['dsf']['dsd']['dsd_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // should be 28
45 $headeroffset += 8;
46 $info['dsf']['dsd']['dsf_file_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
47 $headeroffset += 8;
48 $info['dsf']['dsd']['meta_chunk_offset'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
49 $headeroffset += 8;
50
51
52 $info['dsf']['fmt']['magic'] = substr($dsfheader, $headeroffset, 4);
53 $headeroffset += 4;
54 $magic = 'fmt ';
55 if ($info['dsf']['fmt']['magic'] != $magic) {
56 $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['fmt']['magic']).'"');
57 return false;
58 }
59 $info['dsf']['fmt']['fmt_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // usually 52 bytes
60 $headeroffset += 8;
61 $dsfheader .= $this->fread($info['dsf']['fmt']['fmt_chunk_size'] - 12 + 12); // we have already read the entire DSD chunk, plus 12 bytes of FMT. We now want to read the size of FMT, plus 12 bytes into the next chunk to get magic and size.
62 if (strlen($dsfheader) != ($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size'] + 12)) {
63 $this->error('Expecting '.($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size']).' bytes header, found '.strlen($dsfheader).' bytes');
64 return false;
65 }
66 $info['dsf']['fmt']['format_version'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // usually "1"
67 $headeroffset += 4;
68 $info['dsf']['fmt']['format_id'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // usually "0" = "DSD Raw"
69 $headeroffset += 4;
70 $info['dsf']['fmt']['channel_type_id'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
71 $headeroffset += 4;
72 $info['dsf']['fmt']['channels'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
73 $headeroffset += 4;
74 $info['dsf']['fmt']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
75 $headeroffset += 4;
76 $info['dsf']['fmt']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
77 $headeroffset += 4;
78 $info['dsf']['fmt']['sample_count'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
79 $headeroffset += 8;
80 $info['dsf']['fmt']['channel_block_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
81 $headeroffset += 4;
82 $info['dsf']['fmt']['reserved'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // zero-filled
83 $headeroffset += 4;
84
85
86 $info['dsf']['data']['magic'] = substr($dsfheader, $headeroffset, 4);
87 $headeroffset += 4;
88 $magic = 'data';
89 if ($info['dsf']['data']['magic'] != $magic) {
90 $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['data']['magic']).'"');
91 return false;
92 }
93 $info['dsf']['data']['data_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
94 $headeroffset += 8;
95 $info['avdataoffset'] = $headeroffset;
96 $info['avdataend'] = $info['avdataoffset'] + $info['dsf']['data']['data_chunk_size'];
97
98
99 if ($info['dsf']['dsd']['meta_chunk_offset'] > 0) {
100 $getid3_id3v2 = new getid3_id3v2($this->getid3);
101 $getid3_id3v2->StartingOffset = $info['dsf']['dsd']['meta_chunk_offset'];
102 $getid3_id3v2->Analyze();
103 unset($getid3_id3v2);
104 }
105
106
107 $info['dsf']['fmt']['channel_type'] = $this->DSFchannelTypeLookup($info['dsf']['fmt']['channel_type_id']);
108 $info['audio']['channelmode'] = $info['dsf']['fmt']['channel_type'];
109 $info['audio']['bits_per_sample'] = $info['dsf']['fmt']['bits_per_sample'];
110 $info['audio']['sample_rate'] = $info['dsf']['fmt']['sample_rate'];
111 $info['audio']['channels'] = $info['dsf']['fmt']['channels'];
112 $info['audio']['bitrate'] = $info['audio']['bits_per_sample'] * $info['audio']['sample_rate'] * $info['audio']['channels'];
113 $info['playtime_seconds'] = ($info['dsf']['data']['data_chunk_size'] * 8) / $info['audio']['bitrate'];
114
115 return true;
116 }
getid3_dsf\DSFchannelTypeLookup
static DSFchannelTypeLookup($channel_type_id)
Definition: module.audio.dsf.php:119
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1711
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1683
getid3_handler\error
error($text)
Definition: getid3.php:1752
getid3_id3v2
Definition: module.tag.id3v2.php:20
getid3_lib\PrintHexBytes
static PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8')
Definition: getid3.lib.php:18
getid3_lib\LittleEndian2Int
static LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:292
$info
$info
Definition: index.php:5

References $info, DSFchannelTypeLookup(), getid3_handler\error(), getid3_handler\fread(), getid3_handler\fseek(), getid3_lib\LittleEndian2Int(), and getid3_lib\PrintHexBytes().

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◆ DSFchannelTypeLookup()

static getid3_dsf::DSFchannelTypeLookup (   $channel_type_id)
static

Definition at line 119 of file module.audio.dsf.php.

119 {
120 static $DSFchannelTypeLookup = array(
121 // interleaving order:
122 1 => 'mono', // 1: Mono
123 2 => 'stereo', // 1: Front-Left; 2: Front-Right
124 3 => '3-channel', // 1: Front-Left; 2: Front-Right; 3: Center
125 4 => 'quad', // 1: Front-Left; 2: Front-Right; 3: Back-Left; 4: Back-Right
126 5 => '4-channel', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Low-Frequency
127 6 => '5-channel', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Back-Left 5: Back-Right
128 7 => '5.1', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Low-Frequency; 5: Back-Left; 6: Back-Right
129 );
130 return (isset($DSFchannelTypeLookup[$channel_type_id]) ? $DSFchannelTypeLookup[$channel_type_id] : '');
131 }

Referenced by Analyze().

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The documentation for this class was generated from the following file: