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comparison e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.voc.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.voc.php |
18 // | Module for analyzing Creative VOC Audio files. |
19 // | dependencies: NONE |
20 // +----------------------------------------------------------------------+
21 //
22 // $Id: module.audio.voc.php,v 1.3 2006/11/02 10:48:02 ah Exp $
23
24
25
26 class getid3_voc extends getid3_handler
27 {
28
29 public function Analyze() {
30
31 $getid3 = $this->getid3;
32
33 $original_av_data_offset = $getid3->info['avdataoffset'];
34
35 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
36 $voc_header= fread($getid3->fp, 26);
37
38 // Magic bytes: 'Creative Voice File'
39
40 $info_audio = &$getid3->info['audio'];
41 $getid3->info['voc'] = array ();
42 $info_voc = &$getid3->info['voc'];
43
44 $getid3->info['fileformat'] = 'voc';
45 $info_audio['dataformat'] = 'voc';
46 $info_audio['bitrate_mode'] = 'cbr';
47 $info_audio['lossless'] = true;
48 $info_audio['channels'] = 1; // might be overriden below
49 $info_audio['bits_per_sample'] = 8; // might be overriden below
50
51 // byte # Description
52 // ------ ------------------------------------------
53 // 00-12 'Creative Voice File'
54 // 13 1A (eof to abort printing of file)
55 // 14-15 Offset of first datablock in .voc file (std 1A 00 in Intel Notation)
56 // 16-17 Version number (minor,major) (VOC-HDR puts 0A 01)
57 // 18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11)
58
59 getid3_lib::ReadSequence('LittleEndian2Int', $info_voc['header'], $voc_header, 20,
60 array (
61 'datablock_offset' => 2,
62 'minor_version' => 1,
63 'major_version' => 1
64 )
65 );
66
67 do {
68 $block_offset = ftell($getid3->fp);
69 $block_data = fread($getid3->fp, 4);
70 $block_type = ord($block_data{0});
71 $block_size = getid3_lib::LittleEndian2Int(substr($block_data, 1, 3));
72 $this_block = array ();
73
74 @$info_voc['blocktypes'][$block_type]++;
75
76 switch ($block_type) {
77
78 case 0: // Terminator
79 // do nothing, we'll break out of the loop down below
80 break;
81
82 case 1: // Sound data
83 $block_data .= fread($getid3->fp, 2);
84 if ($getid3->info['avdataoffset'] <= $original_av_data_offset) {
85 $getid3->info['avdataoffset'] = ftell($getid3->fp);
86 }
87 fseek($getid3->fp, $block_size - 2, SEEK_CUR);
88
89 getid3_lib::ReadSequence('LittleEndian2Int', $this_block, $block_data, 4,
90 array (
91 'sample_rate_id' => 1,
92 'compression_type' => 1
93 )
94 );
95
96 $this_block['compression_name'] = getid3_voc::VOCcompressionTypeLookup($this_block['compression_type']);
97 if ($this_block['compression_type'] <= 3) {
98 $info_voc['compressed_bits_per_sample'] = (int)(str_replace('-bit', '', $this_block['compression_name']));
99 }
100
101 // Less accurate sample_rate calculation than the Extended block (#8) data (but better than nothing if Extended Block is not available)
102 if (empty($info_audio['sample_rate'])) {
103 // SR byte = 256 - (1000000 / sample_rate)
104 $info_audio['sample_rate'] = (int)floor((1000000 / (256 - $this_block['sample_rate_id'])) / $info_audio['channels']);
105 }
106 break;
107
108 case 2: // Sound continue
109 case 3: // Silence
110 case 4: // Marker
111 case 6: // Repeat
112 case 7: // End repeat
113 // nothing useful, just skip
114 fseek($getid3->fp, $block_size, SEEK_CUR);
115 break;
116
117 case 8: // Extended
118 $block_data .= fread($getid3->fp, 4);
119
120 //00-01 Time Constant:
121 // Mono: 65536 - (256000000 / sample_rate)
122 // Stereo: 65536 - (256000000 / (sample_rate * 2))
123 getid3_lib::ReadSequence('LittleEndian2Int', $this_block, $block_data, 4,
124 array (
125 'time_constant' => 2,
126 'pack_method' => 1,
127 'stereo' => 1
128 )
129 );
130 $this_block['stereo'] = (bool)$this_block['stereo'];
131
132 $info_audio['channels'] = ($this_block['stereo'] ? 2 : 1);
133 $info_audio['sample_rate'] = (int)floor((256000000 / (65536 - $this_block['time_constant'])) / $info_audio['channels']);
134 break;
135
136 case 9: // data block that supersedes blocks 1 and 8. Used for stereo, 16 bit
137 $block_data .= fread($getid3->fp, 12);
138 if ($getid3->info['avdataoffset'] <= $original_av_data_offset) {
139 $getid3->info['avdataoffset'] = ftell($getid3->fp);
140 }
141 fseek($getid3->fp, $block_size - 12, SEEK_CUR);
142
143 getid3_lib::ReadSequence('LittleEndian2Int', $this_block, $block_data, 4,
144 array (
145 'sample_rate' => 4,
146 'bits_per_sample' => 1,
147 'channels' => 1,
148 'wFormat' => 2
149 )
150 );
151
152 $this_block['compression_name'] = getid3_voc::VOCwFormatLookup($this_block['wFormat']);
153 if (getid3_voc::VOCwFormatActualBitsPerSampleLookup($this_block['wFormat'])) {
154 $info_voc['compressed_bits_per_sample'] = getid3_voc::VOCwFormatActualBitsPerSampleLookup($this_block['wFormat']);
155 }
156
157 $info_audio['sample_rate'] = $this_block['sample_rate'];
158 $info_audio['bits_per_sample'] = $this_block['bits_per_sample'];
159 $info_audio['channels'] = $this_block['channels'];
160 break;
161
162 default:
163 $getid3->warning('Unhandled block type "'.$block_type.'" at offset '.$block_offset);
164 fseek($getid3->fp, $block_size, SEEK_CUR);
165 break;
166 }
167
168 if (!empty($this_block)) {
169 $this_block['block_offset'] = $block_offset;
170 $this_block['block_size'] = $block_size;
171 $this_block['block_type_id'] = $block_type;
172 $info_voc['blocks'][] = $this_block;
173 }
174
175 } while (!feof($getid3->fp) && ($block_type != 0));
176
177 // Terminator block doesn't have size field, so seek back 3 spaces
178 fseek($getid3->fp, -3, SEEK_CUR);
179
180 ksort($info_voc['blocktypes']);
181
182 if (!empty($info_voc['compressed_bits_per_sample'])) {
183 $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / ($info_voc['compressed_bits_per_sample'] * $info_audio['channels'] * $info_audio['sample_rate']);
184 $info_audio['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];
185 }
186
187 return true;
188 }
189
190
191
192 public static function VOCcompressionTypeLookup($index) {
193
194 static $lookup = array (
195 0 => '8-bit',
196 1 => '4-bit',
197 2 => '2.6-bit',
198 3 => '2-bit'
199 );
200 return (isset($lookup[$index]) ? $lookup[$index] : 'Multi DAC ('.($index - 3).') channels');
201 }
202
203
204
205 public static function VOCwFormatLookup($index) {
206
207 static $lookup = array (
208 0x0000 => '8-bit unsigned PCM',
209 0x0001 => 'Creative 8-bit to 4-bit ADPCM',
210 0x0002 => 'Creative 8-bit to 3-bit ADPCM',
211 0x0003 => 'Creative 8-bit to 2-bit ADPCM',
212 0x0004 => '16-bit signed PCM',
213 0x0006 => 'CCITT a-Law',
214 0x0007 => 'CCITT u-Law',
215 0x2000 => 'Creative 16-bit to 4-bit ADPCM'
216 );
217 return (isset($lookup[$index]) ? $lookup[$index] : false);
218 }
219
220
221
222 public static function VOCwFormatActualBitsPerSampleLookup($index) {
223
224 static $lookup = array (
225 0x0000 => 8,
226 0x0001 => 4,
227 0x0002 => 3,
228 0x0003 => 2,
229 0x0004 => 16,
230 0x0006 => 8,
231 0x0007 => 8,
232 0x2000 => 4
233 );
234 return (isset($lookup[$index]) ? $lookup[$index] : false);
235 }
236
237 }
238
239
240 ?>