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comparison e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.xiph.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.xiph.php |
18 // | Module for analyzing Xiph.org audio file formats: |
19 // | Ogg Vorbis, FLAC, OggFLAC and Speex - not Ogg Theora |
20 // | dependencies: module.lib.image_size.php (optional) |
21 // +----------------------------------------------------------------------+
22 //
23 // $Id: module.audio.xiph.php,v 1.5 2006/12/03 21:12:43 ah Exp $
24
25
26
27 class getid3_xiph extends getid3_handler
28 {
29
30 public function Analyze() {
31
32 $getid3 = $this->getid3;
33
34 if ($getid3->option_tags_images) {
35 $getid3->include_module('lib.image_size');
36 }
37
38 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
39
40 $magic = fread($getid3->fp, 4);
41
42 if ($magic == 'OggS') {
43 return $this->ParseOgg();
44 }
45
46 if ($magic == 'fLaC') {
47 return $this->ParseFLAC();
48 }
49
50 }
51
52
53
54 private function ParseOgg() {
55
56 $getid3 = $this->getid3;
57
58 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
59
60 $getid3->info['audio'] = $getid3->info['ogg'] = array ();
61 $info_ogg = &$getid3->info['ogg'];
62 $info_audio = &$getid3->info['audio'];
63
64 $getid3->info['fileformat'] = 'ogg';
65
66
67 //// Page 1 - Stream Header
68
69 $ogg_page_info = $this->ParseOggPageHeader();
70 $info_ogg['pageheader'][$ogg_page_info['page_seqno']] = $ogg_page_info;
71
72 if (ftell($getid3->fp) >= getid3::FREAD_BUFFER_SIZE) {
73 throw new getid3_exception('Could not find start of Ogg page in the first '.getid3::FREAD_BUFFER_SIZE.' bytes (this might not be an Ogg file?)');
74 }
75
76 $file_data = fread($getid3->fp, $ogg_page_info['page_length']);
77 $file_data_offset = 0;
78
79
80 // OggFLAC
81 if (substr($file_data, 0, 4) == 'fLaC') {
82
83 $info_audio['dataformat'] = 'flac';
84 $info_audio['bitrate_mode'] = 'vbr';
85 $info_audio['lossless'] = true;
86
87 }
88
89
90 // Ogg Vorbis
91 elseif (substr($file_data, 1, 6) == 'vorbis') {
92
93 $info_audio['dataformat'] = 'vorbis';
94 $info_audio['lossless'] = false;
95
96 $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int($file_data[0]);
97 $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['stream_type'] = substr($file_data, 1, 6); // hard-coded to 'vorbis'
98
99 getid3_lib::ReadSequence('LittleEndian2Int', $info_ogg, $file_data, 7,
100 array (
101 'bitstreamversion' => 4,
102 'numberofchannels' => 1,
103 'samplerate' => 4,
104 'bitrate_max' => 4,
105 'bitrate_nominal' => 4,
106 'bitrate_min' => 4
107 )
108 );
109
110 $n28 = getid3_lib::LittleEndian2Int($file_data{28});
111 $info_ogg['blocksize_small'] = pow(2, $n28 & 0x0F);
112 $info_ogg['blocksize_large'] = pow(2, ($n28 & 0xF0) >> 4);
113 $info_ogg['stop_bit'] = $n28;
114
115 $info_audio['channels'] = $info_ogg['numberofchannels'];
116 $info_audio['sample_rate'] = $info_ogg['samplerate'];
117
118 $info_audio['bitrate_mode'] = 'vbr'; // overridden if actually abr
119
120 if ($info_ogg['bitrate_max'] == 0xFFFFFFFF) {
121 unset($info_ogg['bitrate_max']);
122 $info_audio['bitrate_mode'] = 'abr';
123 }
124
125 if ($info_ogg['bitrate_nominal'] == 0xFFFFFFFF) {
126 unset($info_ogg['bitrate_nominal']);
127 }
128
129 if ($info_ogg['bitrate_min'] == 0xFFFFFFFF) {
130 unset($info_ogg['bitrate_min']);
131 $info_audio['bitrate_mode'] = 'abr';
132 }
133 }
134
135
136 // Speex
137 elseif (substr($file_data, 0, 8) == 'Speex ') {
138
139 // http://www.speex.org/manual/node10.html
140
141 $info_audio['dataformat'] = 'speex';
142 $getid3->info['mime_type'] = 'audio/speex';
143 $info_audio['bitrate_mode'] = 'abr';
144 $info_audio['lossless'] = false;
145
146 getid3_lib::ReadSequence('LittleEndian2Int', $info_ogg['pageheader'][$ogg_page_info['page_seqno']], $file_data, 0,
147 array (
148 'speex_string' => -8, // hard-coded to 'Speex '
149 'speex_version' => -20, // string
150 'speex_version_id' => 4,
151 'header_size' => 4,
152 'rate' => 4,
153 'mode' => 4,
154 'mode_bitstream_version' => 4,
155 'nb_channels' => 4,
156 'bitrate' => 4,
157 'framesize' => 4,
158 'vbr' => 4,
159 'frames_per_packet' => 4,
160 'extra_headers' => 4,
161 'reserved1' => 4,
162 'reserved2' => 4
163 )
164 );
165
166 $getid3->info['speex']['speex_version'] = trim($info_ogg['pageheader'][$ogg_page_info['page_seqno']]['speex_version']);
167 $getid3->info['speex']['sample_rate'] = $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['rate'];
168 $getid3->info['speex']['channels'] = $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['nb_channels'];
169 $getid3->info['speex']['vbr'] = (bool)$info_ogg['pageheader'][$ogg_page_info['page_seqno']]['vbr'];
170 $getid3->info['speex']['band_type'] = getid3_xiph::SpeexBandModeLookup($info_ogg['pageheader'][$ogg_page_info['page_seqno']]['mode']);
171
172 $info_audio['sample_rate'] = $getid3->info['speex']['sample_rate'];
173 $info_audio['channels'] = $getid3->info['speex']['channels'];
174
175 if ($getid3->info['speex']['vbr']) {
176 $info_audio['bitrate_mode'] = 'vbr';
177 }
178 }
179
180 // Unsupported Ogg file
181 else {
182
183 throw new getid3_exception('Expecting either "Speex " or "vorbis" identifier strings, found neither');
184 }
185
186
187 //// Page 2 - Comment Header
188
189 $ogg_page_info = $this->ParseOggPageHeader();
190 $info_ogg['pageheader'][$ogg_page_info['page_seqno']] = $ogg_page_info;
191
192 switch ($info_audio['dataformat']) {
193
194 case 'vorbis':
195 $file_data = fread($getid3->fp, $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['page_length']);
196 $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($file_data, 0, 1));
197 $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['stream_type'] = substr($file_data, 1, 6); // hard-coded to 'vorbis'
198 $this->ParseVorbisCommentsFilepointer();
199 break;
200
201 case 'flac':
202 if (!$this->FLACparseMETAdata()) {
203 throw new getid3_exception('Failed to parse FLAC headers');
204 }
205 break;
206
207 case 'speex':
208 fseek($getid3->fp, $info_ogg['pageheader'][$ogg_page_info['page_seqno']]['page_length'], SEEK_CUR);
209 $this->ParseVorbisCommentsFilepointer();
210 break;
211 }
212
213
214 //// Last Page - Number of Samples
215
216 fseek($getid3->fp, max($getid3->info['avdataend'] - getid3::FREAD_BUFFER_SIZE, 0), SEEK_SET);
217 $last_chunk_of_ogg = strrev(fread($getid3->fp, getid3::FREAD_BUFFER_SIZE));
218
219 if ($last_OggS_postion = strpos($last_chunk_of_ogg, 'SggO')) {
220 fseek($getid3->fp, $getid3->info['avdataend'] - ($last_OggS_postion + strlen('SggO')), SEEK_SET);
221 $getid3->info['avdataend'] = ftell($getid3->fp);
222 $info_ogg['pageheader']['eos'] = $this->ParseOggPageHeader();
223 $info_ogg['samples'] = $info_ogg['pageheader']['eos']['pcm_abs_position'];
224 $info_ogg['bitrate_average'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / ($info_ogg['samples'] / $info_audio['sample_rate']);
225 }
226
227 if (!empty($info_ogg['bitrate_average'])) {
228 $info_audio['bitrate'] = $info_ogg['bitrate_average'];
229 } elseif (!empty($info_ogg['bitrate_nominal'])) {
230 $info_audio['bitrate'] = $info_ogg['bitrate_nominal'];
231 } elseif (!empty($info_ogg['bitrate_min']) && !empty($info_ogg['bitrate_max'])) {
232 $info_audio['bitrate'] = ($info_ogg['bitrate_min'] + $info_ogg['bitrate_max']) / 2;
233 }
234 if (isset($info_audio['bitrate']) && !isset($getid3->info['playtime_seconds'])) {
235 $getid3->info['playtime_seconds'] = (float)((($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $info_audio['bitrate']);
236 }
237
238 if (isset($info_ogg['vendor'])) {
239 $info_audio['encoder'] = preg_replace('/^Encoded with /', '', $info_ogg['vendor']);
240
241 // Vorbis only
242 if ($info_audio['dataformat'] == 'vorbis') {
243
244 // Vorbis 1.0 starts with Xiph.Org
245 if (preg_match('/^Xiph.Org/', $info_audio['encoder'])) {
246
247 if ($info_audio['bitrate_mode'] == 'abr') {
248
249 // Set -b 128 on abr files
250 $info_audio['encoder_options'] = '-b '.round($info_ogg['bitrate_nominal'] / 1000);
251
252 } elseif (($info_audio['bitrate_mode'] == 'vbr') && ($info_audio['channels'] == 2) && ($info_audio['sample_rate'] >= 44100) && ($info_audio['sample_rate'] <= 48000)) {
253 // Set -q N on vbr files
254 $info_audio['encoder_options'] = '-q '.getid3_xiph::GetQualityFromNominalBitrate($info_ogg['bitrate_nominal']);
255 }
256 }
257
258 if (empty($info_audio['encoder_options']) && !empty($info_ogg['bitrate_nominal'])) {
259 $info_audio['encoder_options'] = 'Nominal bitrate: '.intval(round($info_ogg['bitrate_nominal'] / 1000)).'kbps';
260 }
261 }
262 }
263
264 return true;
265 }
266
267
268
269 private function ParseOggPageHeader() {
270
271 $getid3 = $this->getid3;
272
273 // http://xiph.org/ogg/vorbis/doc/framing.html
274 $ogg_header['page_start_offset'] = ftell($getid3->fp); // where we started from in the file
275
276 $file_data = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
277 $file_data_offset = 0;
278
279 while ((substr($file_data, $file_data_offset++, 4) != 'OggS')) {
280 if ((ftell($getid3->fp) - $ogg_header['page_start_offset']) >= getid3::FREAD_BUFFER_SIZE) {
281 // should be found before here
282 return false;
283 }
284 if ((($file_data_offset + 28) > strlen($file_data)) || (strlen($file_data) < 28)) {
285 if (feof($getid3->fp) || (($file_data .= fread($getid3->fp, getid3::FREAD_BUFFER_SIZE)) === false)) {
286 // get some more data, unless eof, in which case fail
287 return false;
288 }
289 }
290 }
291
292 $file_data_offset += 3; // page, delimited by 'OggS'
293
294 getid3_lib::ReadSequence('LittleEndian2Int', $ogg_header, $file_data, $file_data_offset,
295 array (
296 'stream_structver' => 1,
297 'flags_raw' => 1,
298 'pcm_abs_position' => 8,
299 'stream_serialno' => 4,
300 'page_seqno' => 4,
301 'page_checksum' => 4,
302 'page_segments' => 1
303 )
304 );
305
306 $file_data_offset += 23;
307
308 $ogg_header['flags']['fresh'] = (bool)($ogg_header['flags_raw'] & 0x01); // fresh packet
309 $ogg_header['flags']['bos'] = (bool)($ogg_header['flags_raw'] & 0x02); // first page of logical bitstream (bos)
310 $ogg_header['flags']['eos'] = (bool)($ogg_header['flags_raw'] & 0x04); // last page of logical bitstream (eos)
311
312 $ogg_header['page_length'] = 0;
313 for ($i = 0; $i < $ogg_header['page_segments']; $i++) {
314 $ogg_header['segment_table'][$i] = getid3_lib::LittleEndian2Int($file_data{$file_data_offset++});
315 $ogg_header['page_length'] += $ogg_header['segment_table'][$i];
316 }
317 $ogg_header['header_end_offset'] = $ogg_header['page_start_offset'] + $file_data_offset;
318 $ogg_header['page_end_offset'] = $ogg_header['header_end_offset'] + $ogg_header['page_length'];
319 fseek($getid3->fp, $ogg_header['header_end_offset'], SEEK_SET);
320
321 return $ogg_header;
322 }
323
324
325
326 private function ParseVorbisCommentsFilepointer() {
327
328 $getid3 = $this->getid3;
329
330 $original_offset = ftell($getid3->fp);
331 $comment_start_offset = $original_offset;
332 $comment_data_offset = 0;
333 $vorbis_comment_page = 1;
334
335 switch ($getid3->info['audio']['dataformat']) {
336
337 case 'vorbis':
338 $comment_start_offset = $getid3->info['ogg']['pageheader'][$vorbis_comment_page]['page_start_offset']; // Second Ogg page, after header block
339 fseek($getid3->fp, $comment_start_offset, SEEK_SET);
340 $comment_data_offset = 27 + $getid3->info['ogg']['pageheader'][$vorbis_comment_page]['page_segments'];
341 $comment_data = fread($getid3->fp, getid3_xiph::OggPageSegmentLength($getid3->info['ogg']['pageheader'][$vorbis_comment_page], 1) + $comment_data_offset);
342 $comment_data_offset += (strlen('vorbis') + 1);
343 break;
344
345
346 case 'flac':
347 fseek($getid3->fp, $getid3->info['flac']['VORBIS_COMMENT']['raw']['offset'] + 4, SEEK_SET);
348 $comment_data = fread($getid3->fp, $getid3->info['flac']['VORBIS_COMMENT']['raw']['block_length']);
349 break;
350
351
352 case 'speex':
353 $comment_start_offset = $getid3->info['ogg']['pageheader'][$vorbis_comment_page]['page_start_offset']; // Second Ogg page, after header block
354 fseek($getid3->fp, $comment_start_offset, SEEK_SET);
355 $comment_data_offset = 27 + $getid3->info['ogg']['pageheader'][$vorbis_comment_page]['page_segments'];
356 $comment_data = fread($getid3->fp, getid3_xiph::OggPageSegmentLength($getid3->info['ogg']['pageheader'][$vorbis_comment_page], 1) + $comment_data_offset);
357 break;
358
359
360 default:
361 return false;
362 }
363
364 $vendor_size = getid3_lib::LittleEndian2Int(substr($comment_data, $comment_data_offset, 4));
365 $comment_data_offset += 4;
366
367 $getid3->info['ogg']['vendor'] = substr($comment_data, $comment_data_offset, $vendor_size);
368 $comment_data_offset += $vendor_size;
369
370 $comments_count = getid3_lib::LittleEndian2Int(substr($comment_data, $comment_data_offset, 4));
371 $comment_data_offset += 4;
372
373 $getid3->info['avdataoffset'] = $comment_start_offset + $comment_data_offset;
374
375 for ($i = 0; $i < $comments_count; $i++) {
376
377 $getid3->info['ogg']['comments_raw'][$i]['dataoffset'] = $comment_start_offset + $comment_data_offset;
378
379 if (ftell($getid3->fp) < ($getid3->info['ogg']['comments_raw'][$i]['dataoffset'] + 4)) {
380 $vorbis_comment_page++;
381
382 $ogg_page_info = $this->ParseOggPageHeader();
383 $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']] = $ogg_page_info;
384
385 // First, save what we haven't read yet
386 $as_yet_unused_data = substr($comment_data, $comment_data_offset);
387
388 // Then take that data off the end
389 $comment_data = substr($comment_data, 0, $comment_data_offset);
390
391 // Add [headerlength] bytes of dummy data for the Ogg Page Header, just to keep absolute offsets correct
392 $comment_data .= str_repeat("\x00", 27 + $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']]['page_segments']);
393 $comment_data_offset += (27 + $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']]['page_segments']);
394
395 // Finally, stick the unused data back on the end
396 $comment_data .= $as_yet_unused_data;
397
398 $comment_data .= fread($getid3->fp, getid3_xiph::OggPageSegmentLength($getid3->info['ogg']['pageheader'][$vorbis_comment_page], 1));
399 }
400 $getid3->info['ogg']['comments_raw'][$i]['size'] = getid3_lib::LittleEndian2Int(substr($comment_data, $comment_data_offset, 4));
401
402 // replace avdataoffset with position just after the last vorbiscomment
403 $getid3->info['avdataoffset'] = $getid3->info['ogg']['comments_raw'][$i]['dataoffset'] + $getid3->info['ogg']['comments_raw'][$i]['size'] + 4;
404
405 $comment_data_offset += 4;
406 while ((strlen($comment_data) - $comment_data_offset) < $getid3->info['ogg']['comments_raw'][$i]['size']) {
407
408 if (($getid3->info['ogg']['comments_raw'][$i]['size'] > $getid3->info['avdataend']) || ($getid3->info['ogg']['comments_raw'][$i]['size'] < 0)) {
409 throw new getid3_exception('Invalid Ogg comment size (comment #'.$i.', claims to be '.number_format($getid3->info['ogg']['comments_raw'][$i]['size']).' bytes) - aborting reading comments');
410 }
411
412 $vorbis_comment_page++;
413
414 $ogg_page_info = $this->ParseOggPageHeader();
415 $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']] = $ogg_page_info;
416
417 // First, save what we haven't read yet
418 $as_yet_unused_data = substr($comment_data, $comment_data_offset);
419
420 // Then take that data off the end
421 $comment_data = substr($comment_data, 0, $comment_data_offset);
422
423 // Add [headerlength] bytes of dummy data for the Ogg Page Header, just to keep absolute offsets correct
424 $comment_data .= str_repeat("\x00", 27 + $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']]['page_segments']);
425 $comment_data_offset += (27 + $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']]['page_segments']);
426
427 // Finally, stick the unused data back on the end
428 $comment_data .= $as_yet_unused_data;
429
430 //$comment_data .= fread($getid3->fp, $getid3->info['ogg']['pageheader'][$ogg_page_info['page_seqno']]['page_length']);
431 $comment_data .= fread($getid3->fp, getid3_xiph::OggPageSegmentLength($getid3->info['ogg']['pageheader'][$vorbis_comment_page], 1));
432
433 //$filebaseoffset += $ogg_page_info['header_end_offset'] - $ogg_page_info['page_start_offset'];
434 }
435 $comment_string = substr($comment_data, $comment_data_offset, $getid3->info['ogg']['comments_raw'][$i]['size']);
436 $comment_data_offset += $getid3->info['ogg']['comments_raw'][$i]['size'];
437
438 if (!$comment_string) {
439
440 // no comment?
441 $getid3->warning('Blank Ogg comment ['.$i.']');
442
443 } elseif (strstr($comment_string, '=')) {
444
445 $comment_exploded = explode('=', $comment_string, 2);
446 $getid3->info['ogg']['comments_raw'][$i]['key'] = strtoupper($comment_exploded[0]);
447 $getid3->info['ogg']['comments_raw'][$i]['value'] = @$comment_exploded[1];
448 $getid3->info['ogg']['comments_raw'][$i]['data'] = base64_decode($getid3->info['ogg']['comments_raw'][$i]['value']);
449
450 $getid3->info['ogg']['comments'][strtolower($getid3->info['ogg']['comments_raw'][$i]['key'])][] = $getid3->info['ogg']['comments_raw'][$i]['value'];
451
452 if ($getid3->option_tags_images) {
453 $image_chunk_check = getid3_lib_image_size::get($getid3->info['ogg']['comments_raw'][$i]['data']);
454 $getid3->info['ogg']['comments_raw'][$i]['image_mime'] = image_type_to_mime_type($image_chunk_check[2]);
455 }
456
457 if (!@$getid3->info['ogg']['comments_raw'][$i]['image_mime'] || ($getid3->info['ogg']['comments_raw'][$i]['image_mime'] == 'application/octet-stream')) {
458 unset($getid3->info['ogg']['comments_raw'][$i]['image_mime']);
459 unset($getid3->info['ogg']['comments_raw'][$i]['data']);
460 }
461
462
463 } else {
464
465 $getid3->warning('[known problem with CDex >= v1.40, < v1.50b7] Invalid Ogg comment name/value pair ['.$i.']: '.$comment_string);
466 }
467 }
468
469
470 // Replay Gain Adjustment
471 // http://privatewww.essex.ac.uk/~djmrob/replaygain/
472 if (isset($getid3->info['ogg']['comments']) && is_array($getid3->info['ogg']['comments'])) {
473 foreach ($getid3->info['ogg']['comments'] as $index => $commentvalue) {
474 switch ($index) {
475 case 'rg_audiophile':
476 case 'replaygain_album_gain':
477 $getid3->info['replay_gain']['album']['adjustment'] = (float)$commentvalue[0];
478 unset($getid3->info['ogg']['comments'][$index]);
479 break;
480
481 case 'rg_radio':
482 case 'replaygain_track_gain':
483 $getid3->info['replay_gain']['track']['adjustment'] = (float)$commentvalue[0];
484 unset($getid3->info['ogg']['comments'][$index]);
485 break;
486
487 case 'replaygain_album_peak':
488 $getid3->info['replay_gain']['album']['peak'] = (float)$commentvalue[0];
489 unset($getid3->info['ogg']['comments'][$index]);
490 break;
491
492 case 'rg_peak':
493 case 'replaygain_track_peak':
494 $getid3->info['replay_gain']['track']['peak'] = (float)$commentvalue[0];
495 unset($getid3->info['ogg']['comments'][$index]);
496 break;
497
498 case 'replaygain_reference_loudness':
499 $getid3->info['replay_gain']['reference_volume'] = (float)$commentvalue[0];
500 unset($getid3->info['ogg']['comments'][$index]);
501 break;
502 }
503 }
504 }
505
506 fseek($getid3->fp, $original_offset, SEEK_SET);
507
508 return true;
509 }
510
511
512
513 private function ParseFLAC() {
514
515 $getid3 = $this->getid3;
516
517 // http://flac.sourceforge.net/format.html
518
519 $getid3->info['fileformat'] = 'flac';
520 $getid3->info['audio']['dataformat'] = 'flac';
521 $getid3->info['audio']['bitrate_mode'] = 'vbr';
522 $getid3->info['audio']['lossless'] = true;
523
524 return $this->FLACparseMETAdata();
525 }
526
527
528
529 private function FLACparseMETAdata() {
530
531 $getid3 = $this->getid3;
532
533 do {
534
535 $meta_data_block_offset = ftell($getid3->fp);
536 $meta_data_block_header = fread($getid3->fp, 4);
537 $meta_data_last_block_flag = (bool)(getid3_lib::BigEndian2Int($meta_data_block_header[0]) & 0x80);
538 $meta_data_block_type = getid3_lib::BigEndian2Int($meta_data_block_header[0]) & 0x7F;
539 $meta_data_block_length = getid3_lib::BigEndian2Int(substr($meta_data_block_header, 1, 3));
540 $meta_data_block_type_text = getid3_xiph::FLACmetaBlockTypeLookup($meta_data_block_type);
541
542 if ($meta_data_block_length < 0) {
543 throw new getid3_exception('corrupt or invalid METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$meta_data_block_type.') at offset '.$meta_data_block_offset);
544 }
545
546 $getid3->info['flac'][$meta_data_block_type_text]['raw'] = array (
547 'offset' => $meta_data_block_offset,
548 'last_meta_block' => $meta_data_last_block_flag,
549 'block_type' => $meta_data_block_type,
550 'block_type_text' => $meta_data_block_type_text,
551 'block_length' => $meta_data_block_length,
552 'block_data' => @fread($getid3->fp, $meta_data_block_length)
553 );
554 $getid3->info['avdataoffset'] = ftell($getid3->fp);
555
556 switch ($meta_data_block_type_text) {
557
558 case 'STREAMINFO':
559 if (!$this->FLACparseSTREAMINFO($getid3->info['flac'][$meta_data_block_type_text]['raw']['block_data'])) {
560 return false;
561 }
562 break;
563
564 case 'PADDING':
565 // ignore
566 break;
567
568 case 'APPLICATION':
569 if (!$this->FLACparseAPPLICATION($getid3->info['flac'][$meta_data_block_type_text]['raw']['block_data'])) {
570 return false;
571 }
572 break;
573
574 case 'SEEKTABLE':
575 if (!$this->FLACparseSEEKTABLE($getid3->info['flac'][$meta_data_block_type_text]['raw']['block_data'])) {
576 return false;
577 }
578 break;
579
580 case 'VORBIS_COMMENT':
581 $old_offset = ftell($getid3->fp);
582 fseek($getid3->fp, 0 - $meta_data_block_length, SEEK_CUR);
583 $this->ParseVorbisCommentsFilepointer($getid3->fp, $getid3->info);
584 fseek($getid3->fp, $old_offset, SEEK_SET);
585 break;
586
587 case 'CUESHEET':
588 if (!$this->FLACparseCUESHEET($getid3->info['flac'][$meta_data_block_type_text]['raw']['block_data'])) {
589 return false;
590 }
591 break;
592
593 case 'PICTURE':
594 if (!$this->FLACparsePICTURE($getid3->info['flac'][$meta_data_block_type_text]['raw']['block_data'])) {
595 return false;
596 }
597 break;
598
599 default:
600 $getid3->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$meta_data_block_type.') at offset '.$meta_data_block_offset);
601 }
602
603 } while ($meta_data_last_block_flag === false);
604
605
606 if (isset($getid3->info['flac']['STREAMINFO'])) {
607 $getid3->info['flac']['compressed_audio_bytes'] = $getid3->info['avdataend'] - $getid3->info['avdataoffset'];
608 $getid3->info['flac']['uncompressed_audio_bytes'] = $getid3->info['flac']['STREAMINFO']['samples_stream'] * $getid3->info['flac']['STREAMINFO']['channels'] * ($getid3->info['flac']['STREAMINFO']['bits_per_sample'] / 8);
609 $getid3->info['flac']['compression_ratio'] = $getid3->info['flac']['compressed_audio_bytes'] / $getid3->info['flac']['uncompressed_audio_bytes'];
610 }
611
612 // set md5_data_source - built into flac 0.5+
613 if (isset($getid3->info['flac']['STREAMINFO']['audio_signature'])) {
614
615 if ($getid3->info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) {
616 $getid3->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)');
617
618 } else {
619
620 $getid3->info['md5_data_source'] = '';
621 $md5 = $getid3->info['flac']['STREAMINFO']['audio_signature'];
622 for ($i = 0; $i < strlen($md5); $i++) {
623 $getid3->info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
624 }
625 if (!preg_match('/^[0-9a-f]{32}$/', $getid3->info['md5_data_source'])) {
626 unset($getid3->info['md5_data_source']);
627 }
628
629 }
630
631 }
632
633 $getid3->info['audio']['bits_per_sample'] = $getid3->info['flac']['STREAMINFO']['bits_per_sample'];
634 if ($getid3->info['audio']['bits_per_sample'] == 8) {
635 // special case
636 // must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
637 // MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
638 $getid3->warning('FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file');
639 }
640 if (!empty($getid3->info['ogg']['vendor'])) {
641 $getid3->info['audio']['encoder'] = $getid3->info['ogg']['vendor'];
642 }
643
644 return true;
645 }
646
647
648
649 private function FLACparseSTREAMINFO($meta_data_block_data) {
650
651 $getid3 = $this->getid3;
652
653 getid3_lib::ReadSequence('BigEndian2Int', $getid3->info['flac']['STREAMINFO'], $meta_data_block_data, 0,
654 array (
655 'min_block_size' => 2,
656 'max_block_size' => 2,
657 'min_frame_size' => 3,
658 'max_frame_size' => 3
659 )
660 );
661
662 $sample_rate_channels_sample_bits_stream_samples = getid3_lib::BigEndian2Bin(substr($meta_data_block_data, 10, 8));
663
664 $getid3->info['flac']['STREAMINFO']['sample_rate'] = bindec(substr($sample_rate_channels_sample_bits_stream_samples, 0, 20));
665 $getid3->info['flac']['STREAMINFO']['channels'] = bindec(substr($sample_rate_channels_sample_bits_stream_samples, 20, 3)) + 1;
666 $getid3->info['flac']['STREAMINFO']['bits_per_sample'] = bindec(substr($sample_rate_channels_sample_bits_stream_samples, 23, 5)) + 1;
667 $getid3->info['flac']['STREAMINFO']['samples_stream'] = bindec(substr($sample_rate_channels_sample_bits_stream_samples, 28, 36)); // bindec() returns float in case of int overrun
668 $getid3->info['flac']['STREAMINFO']['audio_signature'] = substr($meta_data_block_data, 18, 16);
669
670 if (!empty($getid3->info['flac']['STREAMINFO']['sample_rate'])) {
671
672 $getid3->info['audio']['bitrate_mode'] = 'vbr';
673 $getid3->info['audio']['sample_rate'] = $getid3->info['flac']['STREAMINFO']['sample_rate'];
674 $getid3->info['audio']['channels'] = $getid3->info['flac']['STREAMINFO']['channels'];
675 $getid3->info['audio']['bits_per_sample'] = $getid3->info['flac']['STREAMINFO']['bits_per_sample'];
676 $getid3->info['playtime_seconds'] = $getid3->info['flac']['STREAMINFO']['samples_stream'] / $getid3->info['flac']['STREAMINFO']['sample_rate'];
677 $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];
678
679 } else {
680
681 throw new getid3_exception('Corrupt METAdata block: STREAMINFO');
682 }
683
684 unset($getid3->info['flac']['STREAMINFO']['raw']);
685
686 return true;
687 }
688
689
690
691 private function FLACparseAPPLICATION($meta_data_block_data) {
692
693 $getid3 = $this->getid3;
694
695 $application_id = getid3_lib::BigEndian2Int(substr($meta_data_block_data, 0, 4));
696
697 $getid3->info['flac']['APPLICATION'][$application_id]['name'] = getid3_xiph::FLACapplicationIDLookup($application_id);
698 $getid3->info['flac']['APPLICATION'][$application_id]['data'] = substr($meta_data_block_data, 4);
699
700 unset($getid3->info['flac']['APPLICATION']['raw']);
701
702 return true;
703 }
704
705
706
707 private function FLACparseSEEKTABLE($meta_data_block_data) {
708
709 $getid3 = $this->getid3;
710
711 $offset = 0;
712 $meta_data_block_length = strlen($meta_data_block_data);
713 while ($offset < $meta_data_block_length) {
714 $sample_number_string = substr($meta_data_block_data, $offset, 8);
715 $offset += 8;
716 if ($sample_number_string == "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF") {
717
718 // placeholder point
719 @$getid3->info['flac']['SEEKTABLE']['placeholders']++;
720 $offset += 10;
721
722 } else {
723
724 $sample_number = getid3_lib::BigEndian2Int($sample_number_string);
725
726 $getid3->info['flac']['SEEKTABLE'][$sample_number]['offset'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 8));
727 $offset += 8;
728
729 $getid3->info['flac']['SEEKTABLE'][$sample_number]['samples'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 2));
730 $offset += 2;
731
732 }
733 }
734
735 unset($getid3->info['flac']['SEEKTABLE']['raw']);
736
737 return true;
738 }
739
740
741
742 private function FLACparseCUESHEET($meta_data_block_data) {
743
744 $getid3 = $this->getid3;
745
746 $getid3->info['flac']['CUESHEET']['media_catalog_number'] = trim(substr($meta_data_block_data, 0, 128), "\0");
747 $getid3->info['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, 128, 8));
748 $getid3->info['flac']['CUESHEET']['flags']['is_cd'] = (bool)(getid3_lib::BigEndian2Int($meta_data_block_data[136]) & 0x80);
749 $getid3->info['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int($meta_data_block_data[395]);
750
751 $offset = 396;
752
753 for ($track = 0; $track < $getid3->info['flac']['CUESHEET']['number_tracks']; $track++) {
754
755 $track_sample_offset = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 8));
756 $offset += 8;
757
758 $track_number = getid3_lib::BigEndian2Int($meta_data_block_data{$offset++});
759
760 $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['sample_offset'] = $track_sample_offset;
761 $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['isrc'] = substr($meta_data_block_data, $offset, 12);
762 $offset += 12;
763
764 $track_flags_raw = getid3_lib::BigEndian2Int($meta_data_block_data{$offset++});
765 $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['flags']['is_audio'] = (bool)($track_flags_raw & 0x80);
766 $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['flags']['pre_emphasis'] = (bool)($track_flags_raw & 0x40);
767
768 $offset += 13; // reserved
769
770 $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['index_points'] = getid3_lib::BigEndian2Int($meta_data_block_data{$offset++});
771
772 for ($index = 0; $index < $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['index_points']; $index++) {
773
774 $index_sample_offset = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 8));
775 $offset += 8;
776
777 $index_number = getid3_lib::BigEndian2Int($meta_data_block_data{$offset++});
778 $getid3->info['flac']['CUESHEET']['tracks'][$track_number]['indexes'][$index_number] = $index_sample_offset;
779
780 $offset += 3; // reserved
781 }
782 }
783
784 unset($getid3->info['flac']['CUESHEET']['raw']);
785
786 return true;
787 }
788
789
790
791 private function FLACparsePICTURE($meta_data_block_data) {
792
793 $getid3 = $this->getid3;
794
795 $picture = &$getid3->info['flac']['PICTURE'][sizeof($getid3->info['flac']['PICTURE']) - 1];
796
797 $offset = 0;
798
799 $picture['type'] = $this->FLACpictureTypeLookup(getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4)));
800 $offset += 4;
801
802 $length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
803 $offset += 4;
804
805 $picture['mime_type'] = substr($meta_data_block_data, $offset, $length);
806 $offset += $length;
807
808 $length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
809 $offset += 4;
810
811 $picture['description'] = substr($meta_data_block_data, $offset, $length);
812 $offset += $length;
813
814 $picture['width'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
815 $offset += 4;
816
817 $picture['height'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
818 $offset += 4;
819
820 $picture['color_depth'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
821 $offset += 4;
822
823 $picture['colors_indexed'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
824 $offset += 4;
825
826 $length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
827 $offset += 4;
828
829 $picture['image_data'] = substr($meta_data_block_data, $offset, $length);
830 $offset += $length;
831
832 unset($getid3->info['flac']['PICTURE']['raw']);
833
834 return true;
835 }
836
837
838
839 public static function SpeexBandModeLookup($mode) {
840
841 static $lookup = array (
842 0 => 'narrow',
843 1 => 'wide',
844 2 => 'ultra-wide'
845 );
846 return (isset($lookup[$mode]) ? $lookup[$mode] : null);
847 }
848
849
850
851 public static function OggPageSegmentLength($ogg_info_array, $segment_number=1) {
852
853 for ($i = 0; $i < $segment_number; $i++) {
854 $segment_length = 0;
855 foreach ($ogg_info_array['segment_table'] as $key => $value) {
856 $segment_length += $value;
857 if ($value < 255) {
858 break;
859 }
860 }
861 }
862 return $segment_length;
863 }
864
865
866
867 public static function GetQualityFromNominalBitrate($nominal_bitrate) {
868
869 // decrease precision
870 $nominal_bitrate = $nominal_bitrate / 1000;
871
872 if ($nominal_bitrate < 128) {
873 // q-1 to q4
874 $qval = ($nominal_bitrate - 64) / 16;
875 } elseif ($nominal_bitrate < 256) {
876 // q4 to q8
877 $qval = $nominal_bitrate / 32;
878 } elseif ($nominal_bitrate < 320) {
879 // q8 to q9
880 $qval = ($nominal_bitrate + 256) / 64;
881 } else {
882 // q9 to q10
883 $qval = ($nominal_bitrate + 1300) / 180;
884 }
885 return round($qval, 1); // 5 or 4.9
886 }
887
888
889
890 public static function FLACmetaBlockTypeLookup($block_type) {
891
892 static $lookup = array (
893 0 => 'STREAMINFO',
894 1 => 'PADDING',
895 2 => 'APPLICATION',
896 3 => 'SEEKTABLE',
897 4 => 'VORBIS_COMMENT',
898 5 => 'CUESHEET',
899 6 => 'PICTURE'
900 );
901 return (isset($lookup[$block_type]) ? $lookup[$block_type] : 'reserved');
902 }
903
904
905
906 public static function FLACapplicationIDLookup($application_id) {
907
908 // http://flac.sourceforge.net/id.html
909
910 static $lookup = array (
911 0x46746F6C => 'flac-tools', // 'Ftol'
912 0x46746F6C => 'Sound Font FLAC', // 'SFFL'
913 0x7065656D => 'Parseable Embedded Extensible Metadata (specification)', // 'peem'
914 0x786D6364 => 'xmcd'
915
916 );
917 return (isset($lookup[$application_id]) ? $lookup[$application_id] : 'reserved');
918 }
919
920
921 public static function FLACpictureTypeLookup($type_id) {
922
923 static $lookup = array (
924
925 0 => 'Other',
926 1 => "32x32 pixels 'file icon' (PNG only)",
927 2 => 'Other file icon',
928 3 => 'Cover (front)',
929 4 => 'Cover (back)',
930 5 => 'Leaflet page',
931 6 => 'Media (e.g. label side of CD)',
932 7 => 'Lead artist/lead performer/soloist',
933 8 => 'Artist/performer',
934 9 => 'Conductor',
935 10 => 'Band/Orchestra',
936 11 => 'Composer',
937 12 => 'Lyricist/text writer',
938 13 => 'Recording Location',
939 14 => 'During recording',
940 15 => 'During performance',
941 16 => 'Movie/video screen capture',
942 17 => 'A bright coloured fish',
943 18 => 'Illustration',
944 19 => 'Band/artist logotype',
945 20 => 'Publisher/Studio logotype'
946 );
947 return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved');
948 }
949
950 }
951
952 ?>