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comparison e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.mpc.php @ 3:3f6b44aa6b35 judyates

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[svn r4] added ability to buy stuff, from a Prints page, but it doesn't work well with the css, and it also has not been fitted into the perl make system.
author rlm
date Mon, 22 Feb 2010 08:02:39 -0500
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2:670229c4eb4b 3:3f6b44aa6b35
1 <?php
2 // +----------------------------------------------------------------------+
3 // | PHP version 5 |
4 // +----------------------------------------------------------------------+
5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
6 // +----------------------------------------------------------------------+
7 // | This source file is subject to version 2 of the GPL license, |
8 // | that is bundled with this package in the file license.txt and is |
9 // | available through the world-wide-web at the following url: |
10 // | http://www.gnu.org/copyleft/gpl.html |
11 // +----------------------------------------------------------------------+
12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
13 // +----------------------------------------------------------------------+
14 // | Authors: James Heinrich <infoØgetid3*org> |
15 // | Allan Hansen <ahØartemis*dk> |
16 // +----------------------------------------------------------------------+
17 // | module.audio.mpc.php |
18 // | Module for analyzing Musepack/MPEG+ Audio files |
19 // | dependencies: NONE |
20 // +----------------------------------------------------------------------+
21 //
22 // $Id: module.audio.mpc.php,v 1.3 2006/11/02 10:48:01 ah Exp $
23
24
25
26 class getid3_mpc extends getid3_handler
27 {
28
29 public function Analyze() {
30
31 $getid3 = $this->getid3;
32
33 // http://www.uni-jena.de/~pfk/mpp/sv8/header.html
34
35 $getid3->info['fileformat'] = 'mpc';
36 $getid3->info['audio']['dataformat'] = 'mpc';
37 $getid3->info['audio']['bitrate_mode'] = 'vbr';
38 $getid3->info['audio']['channels'] = 2; // the format appears to be hardcoded for stereo only
39 $getid3->info['audio']['lossless'] = false;
40
41 $getid3->info['mpc']['header'] = array ();
42 $info_mpc_header = &$getid3->info['mpc']['header'];
43 $info_mpc_header['size'] = 28;
44 $info_mpc_header['raw']['preamble'] = 'MP+'; // Magic bytes
45
46 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
47 $mpc_header_data = fread($getid3->fp, 28);
48
49 $stream_version_byte = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 3, 1));
50 $info_mpc_header['stream_major_version'] = ($stream_version_byte & 0x0F);
51 $info_mpc_header['stream_minor_version'] = ($stream_version_byte & 0xF0) >> 4;
52 if ($info_mpc_header['stream_major_version'] != 7) {
53 throw new getid3_exception('Only Musepack SV7 supported');
54 }
55
56 $info_mpc_header['frame_count'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 4, 4));
57
58 $info_mpc_header['raw']['title_peak'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 12, 2));
59 $info_mpc_header['raw']['title_gain'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 14, 2), true);
60 $info_mpc_header['raw']['album_peak'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 16, 2));
61 $info_mpc_header['raw']['album_gain'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 18, 2), true);
62
63 $info_mpc_header['raw']['not_sure_what'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 24, 3));
64 $info_mpc_header['raw']['encoder_version'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 27, 1));
65
66 $flags_dword1 = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 8, 4));
67 $flags_dword2 = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 20, 4));
68
69 $info_mpc_header['intensity_stereo'] = (bool)(($flags_dword1 & 0x80000000) >> 31);
70 $info_mpc_header['mid_side_stereo'] = (bool)(($flags_dword1 & 0x40000000) >> 30);
71 $info_mpc_header['max_subband'] = ($flags_dword1 & 0x3F000000) >> 24;
72 $info_mpc_header['raw']['profile'] = ($flags_dword1 & 0x00F00000) >> 20;
73 $info_mpc_header['begin_loud'] = (bool)(($flags_dword1 & 0x00080000) >> 19);
74 $info_mpc_header['end_loud'] = (bool)(($flags_dword1 & 0x00040000) >> 18);
75 $info_mpc_header['raw']['sample_rate'] = ($flags_dword1 & 0x00030000) >> 16;
76 $info_mpc_header['max_level'] = ($flags_dword1 & 0x0000FFFF);
77
78 $info_mpc_header['true_gapless'] = (bool)(($flags_dword2 & 0x80000000) >> 31);
79 $info_mpc_header['last_frame_length'] = ($flags_dword2 & 0x7FF00000) >> 20;
80
81 $info_mpc_header['profile'] = getid3_mpc::MPCprofileNameLookup($info_mpc_header['raw']['profile']);
82 $info_mpc_header['sample_rate'] = getid3_mpc::MPCfrequencyLookup($info_mpc_header['raw']['sample_rate']);
83 $getid3->info['audio']['sample_rate'] = $info_mpc_header['sample_rate'];
84 $info_mpc_header['samples'] = ((($info_mpc_header['frame_count'] - 1) * 1152) + $info_mpc_header['last_frame_length']) * $getid3->info['audio']['channels'];
85
86 $getid3->info['playtime_seconds'] = ($info_mpc_header['samples'] / $getid3->info['audio']['channels']) / $getid3->info['audio']['sample_rate'];
87
88 $getid3->info['avdataoffset'] += $info_mpc_header['size'];
89
90 $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];
91
92 $info_mpc_header['title_peak'] = $info_mpc_header['raw']['title_peak'];
93 $info_mpc_header['title_peak_db'] = getid3_mpc::MPCpeakDBLookup($info_mpc_header['title_peak']);
94 if ($info_mpc_header['raw']['title_gain'] < 0) {
95 $info_mpc_header['title_gain_db'] = (float)(32768 + $info_mpc_header['raw']['title_gain']) / -100;
96 }
97 else {
98 $info_mpc_header['title_gain_db'] = (float)$info_mpc_header['raw']['title_gain'] / 100;
99 }
100
101 $info_mpc_header['album_peak'] = $info_mpc_header['raw']['album_peak'];
102 $info_mpc_header['album_peak_db'] = getid3_mpc::MPCpeakDBLookup($info_mpc_header['album_peak']);
103 if ($info_mpc_header['raw']['album_gain'] < 0) {
104 $info_mpc_header['album_gain_db'] = (float)(32768 + $info_mpc_header['raw']['album_gain']) / -100;
105 }
106 else {
107 $info_mpc_header['album_gain_db'] = (float)$info_mpc_header['raw']['album_gain'] / 100;;
108 }
109 $info_mpc_header['encoder_version'] = getid3_mpc::MPCencoderVersionLookup($info_mpc_header['raw']['encoder_version']);
110
111 $getid3->info['replay_gain']['track']['adjustment'] = $info_mpc_header['title_gain_db'];
112 $getid3->info['replay_gain']['album']['adjustment'] = $info_mpc_header['album_gain_db'];
113
114 if ($info_mpc_header['title_peak'] > 0) {
115 $getid3->info['replay_gain']['track']['peak'] = $info_mpc_header['title_peak'];
116 }
117 elseif (round($info_mpc_header['max_level'] * 1.18) > 0) {
118 $getid3->info['replay_gain']['track']['peak'] = (int)(round($info_mpc_header['max_level'] * 1.18)); // why? I don't know - see mppdec.c
119 }
120 if ($info_mpc_header['album_peak'] > 0) {
121 $getid3->info['replay_gain']['album']['peak'] = $info_mpc_header['album_peak'];
122 }
123
124 $getid3->info['audio']['encoder'] = $info_mpc_header['encoder_version'];
125 $getid3->info['audio']['encoder_options'] = $info_mpc_header['profile'];
126
127 return true;
128 }
129
130
131
132 public static function MPCprofileNameLookup($profileid) {
133
134 static $lookup = array (
135 0 => 'no profile',
136 1 => 'Experimental',
137 2 => 'unused',
138 3 => 'unused',
139 4 => 'unused',
140 5 => 'below Telephone (q = 0.0)',
141 6 => 'below Telephone (q = 1.0)',
142 7 => 'Telephone (q = 2.0)',
143 8 => 'Thumb (q = 3.0)',
144 9 => 'Radio (q = 4.0)',
145 10 => 'Standard (q = 5.0)',
146 11 => 'Extreme (q = 6.0)',
147 12 => 'Insane (q = 7.0)',
148 13 => 'BrainDead (q = 8.0)',
149 14 => 'above BrainDead (q = 9.0)',
150 15 => 'above BrainDead (q = 10.0)'
151 );
152 return (isset($lookup[$profileid]) ? $lookup[$profileid] : 'invalid');
153 }
154
155
156
157 public static function MPCfrequencyLookup($frequencyid) {
158
159 static $lookup = array (
160 0 => 44100,
161 1 => 48000,
162 2 => 37800,
163 3 => 32000
164 );
165 return (isset($lookup[$frequencyid]) ? $lookup[$frequencyid] : 'invalid');
166 }
167
168
169
170 public static function MPCpeakDBLookup($int_value) {
171
172 if ($int_value > 0) {
173 return ((log10($int_value) / log10(2)) - 15) * 6;
174 }
175 return false;
176 }
177
178
179
180 public static function MPCencoderVersionLookup($encoder_version) {
181
182 //Encoder version * 100 (106 = 1.06)
183 //EncoderVersion % 10 == 0 Release (1.0)
184 //EncoderVersion % 2 == 0 Beta (1.06)
185 //EncoderVersion % 2 == 1 Alpha (1.05a...z)
186
187 if ($encoder_version == 0) {
188 // very old version, not known exactly which
189 return 'Buschmann v1.7.0-v1.7.9 or Klemm v0.90-v1.05';
190 }
191
192 if (($encoder_version % 10) == 0) {
193
194 // release version
195 return number_format($encoder_version / 100, 2);
196
197 } elseif (($encoder_version % 2) == 0) {
198
199 // beta version
200 return number_format($encoder_version / 100, 2).' beta';
201
202 }
203
204 // alpha version
205 return number_format($encoder_version / 100, 2).' alpha';
206 }
207
208 }
209
210
211 ?>