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.tta.php //
12 // module for analyzing TTA Audio files //
13 // dependencies: NONE //
15 /////////////////////////////////////////////////////////////////
18 class getid3_tta
extends getid3_handler
21 public function Analyze() {
22 $info = &$this->getid3
->info
;
24 $info['fileformat'] = 'tta';
25 $info['audio']['dataformat'] = 'tta';
26 $info['audio']['lossless'] = true;
27 $info['audio']['bitrate_mode'] = 'vbr';
29 $this->fseek($info['avdataoffset']);
30 $ttaheader = $this->fread(26);
32 $info['tta']['magic'] = substr($ttaheader, 0, 3);
34 if ($info['tta']['magic'] != $magic) {
35 $this->error('Expecting "'.getid3_lib
::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib
::PrintHexBytes($info['tta']['magic']).'"');
36 unset($info['fileformat']);
37 unset($info['audio']);
42 switch ($ttaheader{3}) {
43 case "\x01": // TTA v1.x
44 case "\x02": // TTA v1.x
45 case "\x03": // TTA v1.x
46 // "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."
47 $info['tta']['major_version'] = 1;
48 $info['avdataoffset'] +
= 16;
50 $info['tta']['compression_level'] = ord($ttaheader{3});
51 $info['tta']['channels'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 4, 2));
52 $info['tta']['bits_per_sample'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 6, 2));
53 $info['tta']['sample_rate'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 8, 4));
54 $info['tta']['samples_per_channel'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 12, 4));
56 $info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level'];
57 $info['playtime_seconds'] = $info['tta']['samples_per_channel'] / $info['tta']['sample_rate'];
61 // "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."
62 $info['tta']['major_version'] = 2;
63 $info['avdataoffset'] +
= 20;
65 $info['tta']['compression_level'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 4, 2));
66 $info['tta']['audio_format'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 6, 2));
67 $info['tta']['channels'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 8, 2));
68 $info['tta']['bits_per_sample'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 10, 2));
69 $info['tta']['sample_rate'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 12, 4));
70 $info['tta']['data_length'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 16, 4));
72 $info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level'];
73 $info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate'];
77 // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."
78 $info['tta']['major_version'] = 3;
79 $info['avdataoffset'] +
= 26;
81 $info['tta']['audio_format'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 4, 2)); // getid3_riff::wFormatTagLookup()
82 $info['tta']['channels'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 6, 2));
83 $info['tta']['bits_per_sample'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 8, 2));
84 $info['tta']['sample_rate'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 10, 4));
85 $info['tta']['data_length'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 14, 4));
86 $info['tta']['crc32_footer'] = substr($ttaheader, 18, 4);
87 $info['tta']['seek_point'] = getid3_lib
::LittleEndian2Int(substr($ttaheader, 22, 4));
89 $info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate'];
93 $this->error('This version of getID3() ['.$this->getid3
->version().'] only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3});
98 $info['audio']['encoder'] = 'TTA v'.$info['tta']['major_version'];
99 $info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample'];
100 $info['audio']['sample_rate'] = $info['tta']['sample_rate'];
101 $info['audio']['channels'] = $info['tta']['channels'];
102 $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];