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comparison e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.aac_adif.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.aac_adif.php |
18 // | Module for analyzing AAC files with ADIF header. |
19 // | dependencies: NONE |
20 // +----------------------------------------------------------------------+
21 //
22 // $Id: module.audio.aac_adif.php,v 1.3 2006/11/02 10:48:00 ah Exp $
23
24
25
26 class getid3_aac_adif extends getid3_handler
27 {
28
29 public function Analyze() {
30
31 $getid3 = $this->getid3;
32
33 // http://faac.sourceforge.net/wiki/index.php?page=ADIF
34 // http://libmpeg.org/mpeg4/doc/w2203tfs.pdf
35 // adif_header() {
36 // adif_id 32
37 // copyright_id_present 1
38 // if( copyright_id_present )
39 // copyright_id 72
40 // original_copy 1
41 // home 1
42 // bitstream_type 1
43 // bitrate 23
44 // num_program_config_elements 4
45 // for (i = 0; i < num_program_config_elements + 1; i++ ) {
46 // if( bitstream_type == '0' )
47 // adif_buffer_fullness 20
48 // program_config_element()
49 // }
50 // }
51
52
53 $getid3->info['fileformat'] = 'aac';
54 $getid3->info['audio']['dataformat'] = 'aac';
55 $getid3->info['audio']['lossless'] = false;
56
57 $getid3->info['aac']['header'] = array () ;
58 $info_aac = &$getid3->info['aac'];
59 $info_aac_header = & $info_aac['header'];
60
61 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
62 $aac_header_bitstream = getid3_lib::BigEndian2Bin(fread($getid3->fp, 1024));
63
64 $info_aac['header_type'] = 'ADIF';
65 $info_aac_header['mpeg_version'] = 4;
66 $bit_offset = 32;
67
68 $info_aac_header['copyright'] = $aac_header_bitstream{$bit_offset++} == '1';
69 if ($info_aac_header['copyright']) {
70 $info_aac_header['copyright_id'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 72));
71 $bit_offset += 72;
72 }
73
74 $info_aac_header['original_copy'] = $aac_header_bitstream{$bit_offset++} == '1';
75 $info_aac_header['home'] = $aac_header_bitstream{$bit_offset++} == '1';
76 $info_aac_header['is_vbr'] = $aac_header_bitstream{$bit_offset++} == '1';
77
78 if ($info_aac_header['is_vbr']) {
79 $getid3->info['audio']['bitrate_mode'] = 'vbr';
80 $info_aac_header['bitrate_max'] = bindec(substr($aac_header_bitstream, $bit_offset, 23));
81 $bit_offset += 23;
82 }
83 else {
84 $getid3->info['audio']['bitrate_mode'] = 'cbr';
85 $info_aac_header['bitrate'] = bindec(substr($aac_header_bitstream, $bit_offset, 23));
86 $bit_offset += 23;
87 $getid3->info['audio']['bitrate'] = $info_aac_header['bitrate'];
88 }
89
90 $info_aac_header['num_program_configs'] = 1 + bindec(substr($aac_header_bitstream, $bit_offset, 4));
91 $bit_offset += 4;
92
93 for ($i = 0; $i < $info_aac_header['num_program_configs']; $i++) {
94
95 // http://www.audiocoding.com/wiki/index.php?page=program_config_element
96
97 // buffer_fullness 20
98
99 // element_instance_tag 4
100 // object_type 2
101 // sampling_frequency_index 4
102 // num_front_channel_elements 4
103 // num_side_channel_elements 4
104 // num_back_channel_elements 4
105 // num_lfe_channel_elements 2
106 // num_assoc_data_elements 3
107 // num_valid_cc_elements 4
108 // mono_mixdown_present 1
109 // mono_mixdown_element_number 4 if mono_mixdown_present == 1
110 // stereo_mixdown_present 1
111 // stereo_mixdown_element_number 4 if stereo_mixdown_present == 1
112 // matrix_mixdown_idx_present 1
113 // matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1
114 // pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1
115 // for (i = 0; i < num_front_channel_elements; i++) {
116 // front_element_is_cpe[i] 1
117 // front_element_tag_select[i] 4
118 // }
119 // for (i = 0; i < num_side_channel_elements; i++) {
120 // side_element_is_cpe[i] 1
121 // side_element_tag_select[i] 4
122 // }
123 // for (i = 0; i < num_back_channel_elements; i++) {
124 // back_element_is_cpe[i] 1
125 // back_element_tag_select[i] 4
126 // }
127 // for (i = 0; i < num_lfe_channel_elements; i++) {
128 // lfe_element_tag_select[i] 4
129 // }
130 // for (i = 0; i < num_assoc_data_elements; i++) {
131 // assoc_data_element_tag_select[i] 4
132 // }
133 // for (i = 0; i < num_valid_cc_elements; i++) {
134 // cc_element_is_ind_sw[i] 1
135 // valid_cc_element_tag_select[i] 4
136 // }
137 // byte_alignment() VAR
138 // comment_field_bytes 8
139 // for (i = 0; i < comment_field_bytes; i++) {
140 // comment_field_data[i] 8
141 // }
142
143 $info_aac['program_configs'][$i] = array ();
144 $info_aac_program_configs_i = &$info_aac['program_configs'][$i];
145
146 if (!$info_aac_header['is_vbr']) {
147 $info_aac_program_configs_i['buffer_fullness'] = bindec(substr($aac_header_bitstream, $bit_offset, 20));
148 $bit_offset += 20;
149 }
150
151 $info_aac_program_configs_i['element_instance_tag'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
152 $info_aac_program_configs_i['object_type'] = bindec(substr($aac_header_bitstream, $bit_offset + 4, 2));
153 $info_aac_program_configs_i['sampling_frequency_index'] = bindec(substr($aac_header_bitstream, $bit_offset + 6, 4));
154 $info_aac_program_configs_i['num_front_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 10, 4));
155 $info_aac_program_configs_i['num_side_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 14, 4));
156 $info_aac_program_configs_i['num_back_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 18, 4));
157 $info_aac_program_configs_i['num_lfe_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 22, 2));
158 $info_aac_program_configs_i['num_assoc_data_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 24, 3));
159 $info_aac_program_configs_i['num_valid_cc_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 27, 4));
160 $bit_offset += 31;
161
162 $info_aac_program_configs_i['mono_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1;
163 if ($info_aac_program_configs_i['mono_mixdown_present']) {
164 $info_aac_program_configs_i['mono_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
165 $bit_offset += 4;
166 }
167
168 $info_aac_program_configs_i['stereo_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1;
169 if ($info_aac_program_configs_i['stereo_mixdown_present']) {
170 $info_aac_program_configs_i['stereo_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
171 $bit_offset += 4;
172 }
173
174 $info_aac_program_configs_i['matrix_mixdown_idx_present'] = $aac_header_bitstream{$bit_offset++} == 1;
175 if ($info_aac_program_configs_i['matrix_mixdown_idx_present']) {
176 $info_aac_program_configs_i['matrix_mixdown_idx'] = bindec(substr($aac_header_bitstream, $bit_offset, 2));
177 $bit_offset += 2;
178 $info_aac_program_configs_i['pseudo_surround_enable'] = $aac_header_bitstream{$bit_offset++} == 1;
179 }
180
181 for ($j = 0; $j < $info_aac_program_configs_i['num_front_channel_elements']; $j++) {
182 $info_aac_program_configs_i['front_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
183 $info_aac_program_configs_i['front_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
184 $bit_offset += 4;
185 }
186 for ($j = 0; $j < $info_aac_program_configs_i['num_side_channel_elements']; $j++) {
187 $info_aac_program_configs_i['side_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
188 $info_aac_program_configs_i['side_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
189 $bit_offset += 4;
190 }
191 for ($j = 0; $j < $info_aac_program_configs_i['num_back_channel_elements']; $j++) {
192 $info_aac_program_configs_i['back_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
193 $info_aac_program_configs_i['back_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
194 $bit_offset += 4;
195 }
196 for ($j = 0; $j < $info_aac_program_configs_i['num_lfe_channel_elements']; $j++) {
197 $info_aac_program_configs_i['lfe_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
198 $bit_offset += 4;
199 }
200 for ($j = 0; $j < $info_aac_program_configs_i['num_assoc_data_elements']; $j++) {
201 $info_aac_program_configs_i['assoc_data_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
202 $bit_offset += 4;
203 }
204 for ($j = 0; $j < $info_aac_program_configs_i['num_valid_cc_elements']; $j++) {
205 $info_aac_program_configs_i['cc_element_is_ind_sw'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
206 $info_aac_program_configs_i['valid_cc_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
207 $bit_offset += 4;
208 }
209
210 $bit_offset = ceil($bit_offset / 8) * 8;
211
212 $info_aac_program_configs_i['comment_field_bytes'] = bindec(substr($aac_header_bitstream, $bit_offset, 8));
213 $bit_offset += 8;
214
215 $info_aac_program_configs_i['comment_field'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 8 * $info_aac_program_configs_i['comment_field_bytes']));
216 $bit_offset += 8 * $info_aac_program_configs_i['comment_field_bytes'];
217
218 $info_aac_header['profile_text'] = getid3_aac_adif::AACprofileLookup($info_aac_program_configs_i['object_type'], $info_aac_header['mpeg_version']);
219 $info_aac_program_configs_i['sampling_frequency'] = $getid3->info['audio']['sample_rate'] = getid3_aac_adif::AACsampleRateLookup($info_aac_program_configs_i['sampling_frequency_index']);
220 $getid3->info['audio']['channels'] = getid3_aac_adif::AACchannelCountCalculate($info_aac_program_configs_i);
221
222 if ($info_aac_program_configs_i['comment_field']) {
223 $info_aac['comments'][] = $info_aac_program_configs_i['comment_field'];
224 }
225 }
226
227 $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate'];
228 $getid3->info['audio']['encoder_options'] = $info_aac['header_type'].' '.$info_aac_header['profile_text'];
229
230 return true;
231 }
232
233
234
235 public static function Bin2String($bin_string) {
236 // return 'hi' for input of '0110100001101001'
237 $string = '';
238 $bin_string_reversed = strrev($bin_string);
239 for ($i = 0; $i < strlen($bin_string_reversed); $i += 8) {
240 $string = chr(bindec(strrev(substr($bin_string_reversed, $i, 8)))).$string;
241 }
242 return $string;
243 }
244
245
246
247 public static function AACsampleRateLookup($samplerate_id) {
248
249 static $lookup = array (
250 0 => 96000,
251 1 => 88200,
252 2 => 64000,
253 3 => 48000,
254 4 => 44100,
255 5 => 32000,
256 6 => 24000,
257 7 => 22050,
258 8 => 16000,
259 9 => 12000,
260 10 => 11025,
261 11 => 8000,
262 12 => 0,
263 13 => 0,
264 14 => 0,
265 15 => 0
266 );
267 return (isset($lookup[$samplerate_id]) ? $lookup[$samplerate_id] : 'invalid');
268 }
269
270
271
272 public static function AACprofileLookup($profile_id, $mpeg_version) {
273
274 static $lookup = array (
275 2 => array (
276 0 => 'Main profile',
277 1 => 'Low Complexity profile (LC)',
278 2 => 'Scalable Sample Rate profile (SSR)',
279 3 => '(reserved)'
280 ),
281 4 => array (
282 0 => 'AAC_MAIN',
283 1 => 'AAC_LC',
284 2 => 'AAC_SSR',
285 3 => 'AAC_LTP'
286 )
287 );
288 return (isset($lookup[$mpeg_version][$profile_id]) ? $lookup[$mpeg_version][$profile_id] : 'invalid');
289 }
290
291
292
293 public static function AACchannelCountCalculate($program_configs) {
294
295 $channels = 0;
296
297 foreach (array ('front', 'side', 'back') as $placement) {
298 for ($i = 0; $i < $program_configs['num_'.$placement.'_channel_elements']; $i++) {
299
300 // Each element is channel pair (CPE = Channel Pair Element)
301 $channels += 1 + ($program_configs[$placement.'_element_is_cpe'][$i] ? 1 : 0);
302 }
303 }
304
305 return $channels + $program_configs['num_lfe_channel_elements'];
306 }
307
308 }
309
310
311 ?>