ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
Public Member Functions
getid3_la Class Reference
+ Inheritance diagram for getid3_la:
+ Collaboration diagram for getid3_la:

Public Member Functions

 getid3_la (&$fd, &$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.la.php.

Member Function Documentation

◆ Analyze()

getid3_la::Analyze ( )

Reimplemented from getid3_handler.

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

22 {
23 $info = &$this->getid3->info;
24
25 $offset = 0;
26 $this->fseek($info['avdataoffset']);
27 $rawdata = $this->fread($this->getid3->fread_buffer_size());
28
29 switch (substr($rawdata, $offset, 4)) {
30 case 'LA02':
31 case 'LA03':
32 case 'LA04':
33 $info['fileformat'] = 'la';
34 $info['audio']['dataformat'] = 'la';
35 $info['audio']['lossless'] = true;
36
37 $info['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1);
38 $info['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1);
39 $info['la']['version'] = (float) $info['la']['version_major'] + ($info['la']['version_minor'] / 10);
40 $offset += 4;
41
42 $info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
43 $offset += 4;
44 if ($info['la']['uncompressed_size'] == 0) {
45 $info['error'][] = 'Corrupt LA file: uncompressed_size == zero';
46 return false;
47 }
48
49 $WAVEchunk = substr($rawdata, $offset, 4);
50 if ($WAVEchunk !== 'WAVE') {
51 $info['error'][] = 'Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.';
52 return false;
53 }
54 $offset += 4;
55
56 $info['la']['fmt_size'] = 24;
57 if ($info['la']['version'] >= 0.3) {
58
59 $info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
60 $info['la']['header_size'] = 49 + $info['la']['fmt_size'] - 24;
61 $offset += 4;
62
63 } else {
64
65 // version 0.2 didn't support additional data blocks
66 $info['la']['header_size'] = 41;
67
68 }
69
70 $fmt_chunk = substr($rawdata, $offset, 4);
71 if ($fmt_chunk !== 'fmt ') {
72 $info['error'][] = 'Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.';
73 return false;
74 }
75 $offset += 4;
76 $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
77 $offset += 4;
78
79 $info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
80 $offset += 2;
81
82 $info['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
83 $offset += 2;
84 if ($info['la']['channels'] == 0) {
85 $info['error'][] = 'Corrupt LA file: channels == zero';
86 return false;
87 }
88
89 $info['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
90 $offset += 4;
91 if ($info['la']['sample_rate'] == 0) {
92 $info['error'][] = 'Corrupt LA file: sample_rate == zero';
93 return false;
94 }
95
96 $info['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
97 $offset += 4;
98 $info['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
99 $offset += 2;
100 $info['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
101 $offset += 2;
102
103 $info['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
104 $offset += 4;
105
106 $info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1));
107 $offset += 1;
108 $info['la']['flags']['seekable'] = (bool) ($info['la']['raw']['flags'] & 0x01);
109 if ($info['la']['version'] >= 0.4) {
110 $info['la']['flags']['high_compression'] = (bool) ($info['la']['raw']['flags'] & 0x02);
111 }
112
113 $info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
114 $offset += 4;
115
116 // mikeØbevin*de
117 // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
118 // in earlier versions. A seekpoint is added every blocksize * seekevery
119 // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
120 // give the number of bytes used for the seekpoints. Of course, if seeking
121 // is disabled, there are no seekpoints stored.
122 if ($info['la']['version'] >= 0.4) {
123 $info['la']['blocksize'] = 61440;
124 $info['la']['seekevery'] = 19;
125 } else {
126 $info['la']['blocksize'] = 73728;
127 $info['la']['seekevery'] = 16;
128 }
129
130 $info['la']['seekpoint_count'] = 0;
131 if ($info['la']['flags']['seekable']) {
132 $info['la']['seekpoint_count'] = floor($info['la']['samples'] / ($info['la']['blocksize'] * $info['la']['seekevery']));
133
134 for ($i = 0; $i < $info['la']['seekpoint_count']; $i++) {
135 $info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
136 $offset += 4;
137 }
138 }
139
140 if ($info['la']['version'] >= 0.3) {
141
142 // Following the main header information, the program outputs all of the
143 // seekpoints. Following these is what I called the 'footer start',
144 // i.e. the position immediately after the La audio data is finished.
145 $info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
146 $offset += 4;
147
148 if ($info['la']['footerstart'] > $info['filesize']) {
149 $info['warning'][] = 'FooterStart value points to offset '.$info['la']['footerstart'].' which is beyond end-of-file ('.$info['filesize'].')';
150 $info['la']['footerstart'] = $info['filesize'];
151 }
152
153 } else {
154
155 // La v0.2 didn't have FooterStart value
156 $info['la']['footerstart'] = $info['avdataend'];
157
158 }
159
160 if ($info['la']['footerstart'] < $info['avdataend']) {
161 if ($RIFFtempfilename = tempnam(GETID3_TEMP_DIR, 'id3')) {
162 if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) {
163 $RIFFdata = 'WAVE';
164 if ($info['la']['version'] == 0.2) {
165 $RIFFdata .= substr($rawdata, 12, 24);
166 } else {
167 $RIFFdata .= substr($rawdata, 16, 24);
168 }
169 if ($info['la']['footerstart'] < $info['avdataend']) {
170 $this->fseek($info['la']['footerstart']);
171 $RIFFdata .= $this->fread($info['avdataend'] - $info['la']['footerstart']);
172 }
173 $RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata;
174 fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata));
175 fclose($RIFF_fp);
176
177 $getid3_temp = new getID3();
178 $getid3_temp->openfile($RIFFtempfilename);
179 $getid3_riff = new getid3_riff($getid3_temp);
180 $getid3_riff->Analyze();
181
182 if (empty($getid3_temp->info['error'])) {
183 $info['riff'] = $getid3_temp->info['riff'];
184 } else {
185 $info['warning'][] = 'Error parsing RIFF portion of La file: '.implode($getid3_temp->info['error']);
186 }
187 unset($getid3_temp, $getid3_riff);
188 }
189 unlink($RIFFtempfilename);
190 }
191 }
192
193 // $info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway
194 $info['avdataend'] = $info['avdataoffset'] + $info['la']['footerstart'];
195 $info['avdataoffset'] = $info['avdataoffset'] + $offset;
196
197 $info['la']['compression_ratio'] = (float) (($info['avdataend'] - $info['avdataoffset']) / $info['la']['uncompressed_size']);
198 $info['playtime_seconds'] = (float) ($info['la']['samples'] / $info['la']['sample_rate']) / $info['la']['channels'];
199 if ($info['playtime_seconds'] == 0) {
200 $info['error'][] = 'Corrupt LA file: playtime_seconds == zero';
201 return false;
202 }
203
204 $info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
205 //$info['audio']['codec'] = $info['la']['codec'];
206 $info['audio']['bits_per_sample'] = $info['la']['bits_per_sample'];
207 break;
208
209 default:
210 if (substr($rawdata, $offset, 2) == 'LA') {
211 $info['error'][] = 'This version of getID3() ['.$this->getid3->version().'] does not support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.';
212 } else {
213 $info['error'][] = 'Not a LA (Lossless-Audio) file';
214 }
215 return false;
216 break;
217 }
218
219 $info['audio']['channels'] = $info['la']['channels'];
220 $info['audio']['sample_rate'] = (int) $info['la']['sample_rate'];
221 $info['audio']['encoder'] = 'LA v'.$info['la']['version'];
222
223 return true;
224 }
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_lib\LittleEndian2Int
LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:266
getid3_lib\PrintHexBytes
PrintHexBytes($string, $hex=true, $spaces=true, $htmlsafe=true)
Definition: getid3.lib.php:17
getid3_riff
Definition: module.audio-video.riff.php:22
$info
$info
Definition: example_052.php:80

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

+ Here is the call graph for this function:

◆ getid3_la()

getid3_la::getid3_la ( &  $fd,
&  $ThisFileInfo 
)

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

21 {
22 $offset = 0;
23 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
24 $rawdata = fread($fd, GETID3_FREAD_BUFFER_SIZE);
25
26 switch (substr($rawdata, $offset, 4)) {
27 case 'LA02':
28 case 'LA03':
29 case 'LA04':
30 $ThisFileInfo['fileformat'] = 'la';
31 $ThisFileInfo['audio']['dataformat'] = 'la';
32 $ThisFileInfo['audio']['lossless'] = true;
33
34 $ThisFileInfo['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1);
35 $ThisFileInfo['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1);
36 $ThisFileInfo['la']['version'] = (float) $ThisFileInfo['la']['version_major'] + ($ThisFileInfo['la']['version_minor'] / 10);
37 $offset += 4;
38
39 $ThisFileInfo['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
40 $offset += 4;
41 if ($ThisFileInfo['la']['uncompressed_size'] == 0) {
42 $ThisFileInfo['error'][] = 'Corrupt LA file: uncompressed_size == zero';
43 return false;
44 }
45
46 $WAVEchunk = substr($rawdata, $offset, 4);
47 if ($WAVEchunk !== 'WAVE') {
48 $ThisFileInfo['error'][] = 'Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.';
49 return false;
50 }
51 $offset += 4;
52
53 $ThisFileInfo['la']['fmt_size'] = 24;
54 if ($ThisFileInfo['la']['version'] >= 0.3) {
55
56 $ThisFileInfo['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
57 $ThisFileInfo['la']['header_size'] = 49 + $ThisFileInfo['la']['fmt_size'] - 24;
58 $offset += 4;
59
60 } else {
61
62 // version 0.2 didn't support additional data blocks
63 $ThisFileInfo['la']['header_size'] = 41;
64
65 }
66
67 $fmt_chunk = substr($rawdata, $offset, 4);
68 if ($fmt_chunk !== 'fmt ') {
69 $ThisFileInfo['error'][] = 'Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.';
70 return false;
71 }
72 $offset += 4;
73 $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
74 $offset += 4;
75
76 $ThisFileInfo['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
77 $offset += 2;
78
79 $ThisFileInfo['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
80 $offset += 2;
81 if ($ThisFileInfo['la']['channels'] == 0) {
82 $ThisFileInfo['error'][] = 'Corrupt LA file: channels == zero';
83 return false;
84 }
85
86 $ThisFileInfo['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
87 $offset += 4;
88 if ($ThisFileInfo['la']['sample_rate'] == 0) {
89 $ThisFileInfo['error'][] = 'Corrupt LA file: sample_rate == zero';
90 return false;
91 }
92
93 $ThisFileInfo['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
94 $offset += 4;
95 $ThisFileInfo['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
96 $offset += 2;
97 $ThisFileInfo['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
98 $offset += 2;
99
100 $ThisFileInfo['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
101 $offset += 4;
102
103 $ThisFileInfo['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1));
104 $offset += 1;
105 $ThisFileInfo['la']['flags']['seekable'] = (bool) ($ThisFileInfo['la']['raw']['flags'] & 0x01);
106 if ($ThisFileInfo['la']['version'] >= 0.4) {
107 $ThisFileInfo['la']['flags']['high_compression'] = (bool) ($ThisFileInfo['la']['raw']['flags'] & 0x02);
108 }
109
110 $ThisFileInfo['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
111 $offset += 4;
112
113 // mikeØbevin*de
114 // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
115 // in earlier versions. A seekpoint is added every blocksize * seekevery
116 // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
117 // give the number of bytes used for the seekpoints. Of course, if seeking
118 // is disabled, there are no seekpoints stored.
119 if ($ThisFileInfo['la']['version'] >= 0.4) {
120 $ThisFileInfo['la']['blocksize'] = 61440;
121 $ThisFileInfo['la']['seekevery'] = 19;
122 } else {
123 $ThisFileInfo['la']['blocksize'] = 73728;
124 $ThisFileInfo['la']['seekevery'] = 16;
125 }
126
127 $ThisFileInfo['la']['seekpoint_count'] = 0;
128 if ($ThisFileInfo['la']['flags']['seekable']) {
129 $ThisFileInfo['la']['seekpoint_count'] = floor($ThisFileInfo['la']['samples'] / ($ThisFileInfo['la']['blocksize'] * $ThisFileInfo['la']['seekevery']));
130
131 for ($i = 0; $i < $ThisFileInfo['la']['seekpoint_count']; $i++) {
132 $ThisFileInfo['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
133 $offset += 4;
134 }
135 }
136
137 if ($ThisFileInfo['la']['version'] >= 0.3) {
138
139 // Following the main header information, the program outputs all of the
140 // seekpoints. Following these is what I called the 'footer start',
141 // i.e. the position immediately after the La audio data is finished.
142 $ThisFileInfo['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
143 $offset += 4;
144
145 if ($ThisFileInfo['la']['footerstart'] > $ThisFileInfo['filesize']) {
146 $ThisFileInfo['warning'][] = 'FooterStart value points to offset '.$ThisFileInfo['la']['footerstart'].' which is beyond end-of-file ('.$ThisFileInfo['filesize'].')';
147 $ThisFileInfo['la']['footerstart'] = $ThisFileInfo['filesize'];
148 }
149
150 } else {
151
152 // La v0.2 didn't have FooterStart value
153 $ThisFileInfo['la']['footerstart'] = $ThisFileInfo['avdataend'];
154
155 }
156
157 if ($ThisFileInfo['la']['footerstart'] < $ThisFileInfo['avdataend']) {
158 if ($RIFFtempfilename = tempnam('*', 'id3')) {
159 if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) {
160 $RIFFdata = 'WAVE';
161 if ($ThisFileInfo['la']['version'] == 0.2) {
162 $RIFFdata .= substr($rawdata, 12, 24);
163 } else {
164 $RIFFdata .= substr($rawdata, 16, 24);
165 }
166 if ($ThisFileInfo['la']['footerstart'] < $ThisFileInfo['avdataend']) {
167 fseek($fd, $ThisFileInfo['la']['footerstart'], SEEK_SET);
168 $RIFFdata .= fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['la']['footerstart']);
169 }
170 $RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata;
171 fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata));
172 $dummy = $ThisFileInfo;
173 $dummy['filesize'] = strlen($RIFFdata);
174 $dummy['avdataoffset'] = 0;
175 $dummy['avdataend'] = $dummy['filesize'];
176
177 $riff = new getid3_riff($RIFF_fp, $dummy);
178 if (empty($dummy['error'])) {
179 $ThisFileInfo['riff'] = $dummy['riff'];
180 } else {
181 $ThisFileInfo['warning'][] = 'Error parsing RIFF portion of La file: '.implode($dummy['error']);
182 }
183 unset($dummy);
184 fclose($RIFF_fp);
185 }
186 unlink($RIFFtempfilename);
187 }
188 }
189
190 // $ThisFileInfo['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway
191 $ThisFileInfo['avdataend'] = $ThisFileInfo['avdataoffset'] + $ThisFileInfo['la']['footerstart'];
192 $ThisFileInfo['avdataoffset'] = $ThisFileInfo['avdataoffset'] + $offset;
193
194 //$ThisFileInfo['la']['codec'] = RIFFwFormatTagLookup($ThisFileInfo['la']['raw']['format']);
195 $ThisFileInfo['la']['compression_ratio'] = (float) (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $ThisFileInfo['la']['uncompressed_size']);
196 $ThisFileInfo['playtime_seconds'] = (float) ($ThisFileInfo['la']['samples'] / $ThisFileInfo['la']['sample_rate']) / $ThisFileInfo['la']['channels'];
197 if ($ThisFileInfo['playtime_seconds'] == 0) {
198 $ThisFileInfo['error'][] = 'Corrupt LA file: playtime_seconds == zero';
199 return false;
200 }
201
202 $ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['playtime_seconds'];
203 //$ThisFileInfo['audio']['codec'] = $ThisFileInfo['la']['codec'];
204 $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['la']['bits_per_sample'];
205 break;
206
207 default:
208 if (substr($rawdata, $offset, 2) == 'LA') {
209 $ThisFileInfo['error'][] = 'This version of getID3() (v'.GETID3_VERSION.') doesn\'t support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.';
210 } else {
211 $ThisFileInfo['error'][] = 'Not a LA (Lossless-Audio) file';
212 }
213 return false;
214 break;
215 }
216
217 $ThisFileInfo['audio']['channels'] = $ThisFileInfo['la']['channels'];
218 $ThisFileInfo['audio']['sample_rate'] = (int) $ThisFileInfo['la']['sample_rate'];
219 $ThisFileInfo['audio']['encoder'] = 'LA v'.$ThisFileInfo['la']['version'];
220
221 return true;
222 }
GETID3_FREAD_BUFFER_SIZE
const GETID3_FREAD_BUFFER_SIZE
Definition: getid3.php:14

References getid3_handler\fread(), getid3_handler\fseek(), GETID3_FREAD_BUFFER_SIZE, getid3_lib\LittleEndian2Int(), and getid3_lib\PrintHexBytes().

+ Here is the call graph for this function:
The documentation for this class was generated from the following files: