3 /////////////////////////////////////////////////////////////////
4 /// getID3() by James Heinrich <info@getid3.org> //
5 // available at https://github.com/JamesHeinrich/getID3 //
6 // or https://www.getid3.org //
7 // or http://getid3.sourceforge.net //
8 // see readme.txt for more details //
9 /////////////////////////////////////////////////////////////////
11 // module.audio.shorten.php //
12 // module for analyzing Shorten Audio files //
13 // dependencies: NONE //
15 /////////////////////////////////////////////////////////////////
18 class getid3_rkau
extends getid3_handler
23 public function Analyze() {
24 $info = &$this->getid3
->info
;
26 $this->fseek($info['avdataoffset']);
27 $RKAUHeader = $this->fread(20);
29 if (substr($RKAUHeader, 0, 3) != $magic) {
30 $this->error('Expecting "'.getid3_lib
::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib
::PrintHexBytes(substr($RKAUHeader, 0, 3)).'"');
34 $info['fileformat'] = 'rkau';
35 $info['audio']['dataformat'] = 'rkau';
36 $info['audio']['bitrate_mode'] = 'vbr';
38 $info['rkau']['raw']['version'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 3, 1));
39 $info['rkau']['version'] = '1.'.str_pad($info['rkau']['raw']['version'] & 0x0F, 2, '0', STR_PAD_LEFT
);
40 if (($info['rkau']['version'] > 1.07) ||
($info['rkau']['version'] < 1.06)) {
41 $this->error('This version of getID3() ['.$this->getid3
->version().'] can only parse RKAU files v1.06 and 1.07 (this file is v'.$info['rkau']['version'].')');
46 $info['rkau']['source_bytes'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 4, 4));
47 $info['rkau']['sample_rate'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 8, 4));
48 $info['rkau']['channels'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 12, 1));
49 $info['rkau']['bits_per_sample'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 13, 1));
51 $info['rkau']['raw']['quality'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 14, 1));
52 $this->RKAUqualityLookup($info['rkau']);
54 $info['rkau']['raw']['flags'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 15, 1));
55 $info['rkau']['flags']['joint_stereo'] = !($info['rkau']['raw']['flags'] & 0x01);
56 $info['rkau']['flags']['streaming'] = (bool) ($info['rkau']['raw']['flags'] & 0x02);
57 $info['rkau']['flags']['vrq_lossy_mode'] = (bool) ($info['rkau']['raw']['flags'] & 0x04);
59 if ($info['rkau']['flags']['streaming']) {
60 $info['avdataoffset'] +
= 20;
61 $info['rkau']['compressed_bytes'] = getid3_lib
::LittleEndian2Int(substr($RKAUHeader, 16, 4));
63 $info['avdataoffset'] +
= 16;
64 $info['rkau']['compressed_bytes'] = $info['avdataend'] - $info['avdataoffset'] - 1;
66 // Note: compressed_bytes does not always equal what appears to be the actual number of compressed bytes,
67 // sometimes it's more, sometimes less. No idea why(?)
69 $info['audio']['lossless'] = $info['rkau']['lossless'];
70 $info['audio']['channels'] = $info['rkau']['channels'];
71 $info['audio']['bits_per_sample'] = $info['rkau']['bits_per_sample'];
72 $info['audio']['sample_rate'] = $info['rkau']['sample_rate'];
74 $info['playtime_seconds'] = $info['rkau']['source_bytes'] / ($info['rkau']['sample_rate'] * $info['rkau']['channels'] * ($info['rkau']['bits_per_sample'] / 8));
75 $info['audio']['bitrate'] = ($info['rkau']['compressed_bytes'] * 8) / $info['playtime_seconds'];
82 * @param array $RKAUdata
86 public function RKAUqualityLookup(&$RKAUdata) {
87 $level = ($RKAUdata['raw']['quality'] & 0xF0) >> 4;
88 $quality = $RKAUdata['raw']['quality'] & 0x0F;
90 $RKAUdata['lossless'] = (($quality == 0) ?
true : false);
91 $RKAUdata['compression_level'] = $level +
1;
92 if (!$RKAUdata['lossless']) {
93 $RKAUdata['quality_setting'] = $quality;