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module.audio.flac.php @ 3544

Last change on this file since 3544 was 3544, checked in by vdigital, 15 years ago
Change: getid3 upgraded to -> 1.7.9
Property svn:eol-style set to `LF` Property svn:keywords set to `Author Date Id Revision`
File size: 16.4 KB

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1	<?php
2	/////////////////////////////////////////////////////////////////
3	/// getID3() by James Heinrich <info@getid3.org> //
4	// available at http://getid3.sourceforge.net //
5	// or http://www.getid3.org //
6	/////////////////////////////////////////////////////////////////
7	// See readme.txt for more details //
8	/////////////////////////////////////////////////////////////////
9	// //
10	// module.audio.flac.php //
11	// module for analyzing FLAC and OggFLAC audio files //
12	// dependencies: module.audio.ogg.php //
13	// ///
14	/////////////////////////////////////////////////////////////////
15
16
17	getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
18
19	class getid3_flac
20	{
21
22	function getid3_flac(&$fd, &$ThisFileInfo) {
23	// http://flac.sourceforge.net/format.html
24
25	fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
26	$StreamMarker = fread($fd, 4);
27	if ($StreamMarker != 'fLaC') {
28	$ThisFileInfo['error'][] = 'Expecting "fLaC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$StreamMarker.'"';
29	return false;
30	}
31	$ThisFileInfo['fileformat'] = 'flac';
32	$ThisFileInfo['audio']['dataformat'] = 'flac';
33	$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
34	$ThisFileInfo['audio']['lossless'] = true;
35
36	return getid3_flac::FLACparseMETAdata($fd, $ThisFileInfo);
37	}
38
39
40	function FLACparseMETAdata(&$fd, &$ThisFileInfo) {
41
42	do {
43	$METAdataBlockOffset = ftell($fd);
44	$METAdataBlockHeader = fread($fd, 4);
45	$METAdataLastBlockFlag = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
46	$METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7F;
47	$METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
48	$METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($METAdataBlockType);
49
50	if ($METAdataBlockLength < 0) {
51	$ThisFileInfo['error'][] = 'corrupt or invalid METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset;
52	break;
53	}
54
55	$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'] = array();
56	$ThisFileInfo_flac_METAdataBlockTypeText_raw = &$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'];
57
58	$ThisFileInfo_flac_METAdataBlockTypeText_raw['offset'] = $METAdataBlockOffset;
59	$ThisFileInfo_flac_METAdataBlockTypeText_raw['last_meta_block'] = $METAdataLastBlockFlag;
60	$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_type'] = $METAdataBlockType;
61	$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_type_text'] = $METAdataBlockTypeText;
62	$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_length'] = $METAdataBlockLength;
63	$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'] = @fread($fd, $METAdataBlockLength);
64	$ThisFileInfo['avdataoffset'] = ftell($fd);
65
66	switch ($METAdataBlockTypeText) {
67
68	case 'STREAMINFO':
69	if (!getid3_flac::FLACparseSTREAMINFO($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
70	return false;
71	}
72	break;
73
74	case 'PADDING':
75	// ignore
76	break;
77
78	case 'APPLICATION':
79	if (!getid3_flac::FLACparseAPPLICATION($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
80	return false;
81	}
82	break;
83
84	case 'SEEKTABLE':
85	if (!getid3_flac::FLACparseSEEKTABLE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
86	return false;
87	}
88	break;
89
90	case 'VORBIS_COMMENT':
91	$OldOffset = ftell($fd);
92	fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR);
93	getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
94	fseek($fd, $OldOffset, SEEK_SET);
95	break;
96
97	case 'CUESHEET':
98	if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
99	return false;
100	}
101	break;
102
103	case 'PICTURE':
104	if (!$this->FLACparsePICTURE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
105	return false;
106	}
107	break;
108
109	default:
110	$ThisFileInfo['warning'][] = 'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset;
111	break;
112	}
113
114	} while ($METAdataLastBlockFlag === false);
115
116
117	if (isset($ThisFileInfo['flac']['STREAMINFO'])) {
118	$ThisFileInfo['flac']['compressed_audio_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
119	$ThisFileInfo['flac']['uncompressed_audio_bytes'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] * $ThisFileInfo['flac']['STREAMINFO']['channels'] * ($ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] / 8);
120	if ($ThisFileInfo['flac']['uncompressed_audio_bytes'] == 0) {
121	$ThisFileInfo['error'][] = 'Corrupt FLAC file: uncompressed_audio_bytes == zero';
122	return false;
123	}
124	$ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes'];
125	}
126
127	// set md5_data_source - built into flac 0.5+
128	if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) {
129
130	if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) {
131
132	$ThisFileInfo['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)';
133
134	} else {
135
136	$ThisFileInfo['md5_data_source'] = '';
137	$md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature'];
138	for ($i = 0; $i < strlen($md5); $i++) {
139	$ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
140	}
141	if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) {
142	unset($ThisFileInfo['md5_data_source']);
143	}
144
145	}
146
147	}
148
149	$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
150	if ($ThisFileInfo['audio']['bits_per_sample'] == 8) {
151	// special case
152	// must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
153	// MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
154	$ThisFileInfo['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file';
155	}
156	if (!empty($ThisFileInfo['ogg']['vendor'])) {
157	$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor'];
158	}
159
160	return true;
161	}
162
163	function FLACmetaBlockTypeLookup($blocktype) {
164	static $FLACmetaBlockTypeLookup = array();
165	if (empty($FLACmetaBlockTypeLookup)) {
166	$FLACmetaBlockTypeLookup[0] = 'STREAMINFO';
167	$FLACmetaBlockTypeLookup[1] = 'PADDING';
168	$FLACmetaBlockTypeLookup[2] = 'APPLICATION';
169	$FLACmetaBlockTypeLookup[3] = 'SEEKTABLE';
170	$FLACmetaBlockTypeLookup[4] = 'VORBIS_COMMENT';
171	$FLACmetaBlockTypeLookup[5] = 'CUESHEET';
172	$FLACmetaBlockTypeLookup[6] = 'PICTURE';
173	}
174	return (isset($FLACmetaBlockTypeLookup[$blocktype]) ? $FLACmetaBlockTypeLookup[$blocktype] : 'reserved');
175	}
176
177	function FLACapplicationIDLookup($applicationid) {
178	static $FLACapplicationIDLookup = array();
179	if (empty($FLACapplicationIDLookup)) {
180	// http://flac.sourceforge.net/id.html
181	$FLACapplicationIDLookup[0x46746F6C] = 'flac-tools'; // 'Ftol'
182	$FLACapplicationIDLookup[0x46746F6C] = 'Sound Font FLAC'; // 'SFFL'
183	}
184	return (isset($FLACapplicationIDLookup[$applicationid]) ? $FLACapplicationIDLookup[$applicationid] : 'reserved');
185	}
186
187	function FLACpictureTypeLookup($type_id) {
188	static $lookup = array (
189	0 => 'Other',
190	1 => '32x32 pixels \'file icon\' (PNG only)',
191	2 => 'Other file icon',
192	3 => 'Cover (front)',
193	4 => 'Cover (back)',
194	5 => 'Leaflet page',
195	6 => 'Media (e.g. label side of CD)',
196	7 => 'Lead artist/lead performer/soloist',
197	8 => 'Artist/performer',
198	9 => 'Conductor',
199	10 => 'Band/Orchestra',
200	11 => 'Composer',
201	12 => 'Lyricist/text writer',
202	13 => 'Recording Location',
203	14 => 'During recording',
204	15 => 'During performance',
205	16 => 'Movie/video screen capture',
206	17 => 'A bright coloured fish',
207	18 => 'Illustration',
208	19 => 'Band/artist logotype',
209	20 => 'Publisher/Studio logotype',
210	);
211	return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved');
212	}
213
214	function FLACparseSTREAMINFO($METAdataBlockData, &$ThisFileInfo) {
215	$offset = 0;
216	$ThisFileInfo['flac']['STREAMINFO']['min_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
217	$offset += 2;
218	$ThisFileInfo['flac']['STREAMINFO']['max_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
219	$offset += 2;
220	$ThisFileInfo['flac']['STREAMINFO']['min_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3));
221	$offset += 3;
222	$ThisFileInfo['flac']['STREAMINFO']['max_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3));
223	$offset += 3;
224
225	$SampleRateChannelsSampleBitsStreamSamples = getid3_lib::BigEndian2Bin(substr($METAdataBlockData, $offset, 8));
226	$ThisFileInfo['flac']['STREAMINFO']['sample_rate'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 0, 20));
227	$ThisFileInfo['flac']['STREAMINFO']['channels'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 20, 3)) + 1;
228	$ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 23, 5)) + 1;
229	$ThisFileInfo['flac']['STREAMINFO']['samples_stream'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 28, 36));
230	$offset += 8;
231
232	$ThisFileInfo['flac']['STREAMINFO']['audio_signature'] = substr($METAdataBlockData, $offset, 16);
233	$offset += 16;
234
235	if (!empty($ThisFileInfo['flac']['STREAMINFO']['sample_rate'])) {
236
237	$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
238	$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
239	$ThisFileInfo['audio']['channels'] = $ThisFileInfo['flac']['STREAMINFO']['channels'];
240	$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
241	$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] / $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
242	$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
243
244	} else {
245
246	$ThisFileInfo['error'][] = 'Corrupt METAdata block: STREAMINFO';
247	return false;
248
249	}
250
251	unset($ThisFileInfo['flac']['STREAMINFO']['raw']);
252
253	return true;
254	}
255
256
257	function FLACparseAPPLICATION($METAdataBlockData, &$ThisFileInfo) {
258	$offset = 0;
259	$ApplicationID = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 4));
260	$offset += 4;
261	$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['name'] = getid3_flac::FLACapplicationIDLookup($ApplicationID);
262	$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['data'] = substr($METAdataBlockData, $offset);
263	$offset = $METAdataBlockLength;
264
265	unset($ThisFileInfo['flac']['APPLICATION']['raw']);
266
267	return true;
268	}
269
270
271	function FLACparseSEEKTABLE($METAdataBlockData, &$ThisFileInfo) {
272	$offset = 0;
273	$METAdataBlockLength = strlen($METAdataBlockData);
274	$placeholderpattern = str_repeat("\xFF", 8);
275	while ($offset < $METAdataBlockLength) {
276	$SampleNumberString = substr($METAdataBlockData, $offset, 8);
277	$offset += 8;
278	if ($SampleNumberString == $placeholderpattern) {
279
280	// placeholder point
281	@$ThisFileInfo['flac']['SEEKTABLE']['placeholders']++;
282	$offset += 10;
283
284	} else {
285
286	$SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString);
287	$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
288	$offset += 8;
289	$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
290	$offset += 2;
291
292	}
293	}
294
295	unset($ThisFileInfo['flac']['SEEKTABLE']['raw']);
296
297	return true;
298	}
299
300	function FLACparseCUESHEET($METAdataBlockData, &$ThisFileInfo) {
301	$offset = 0;
302	$ThisFileInfo['flac']['CUESHEET']['media_catalog_number'] = trim(substr($METAdataBlockData, $offset, 128), "\0");
303	$offset += 128;
304	$ThisFileInfo['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
305	$offset += 8;
306	$ThisFileInfo['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)) & 0x80);
307	$offset += 1;
308
309	$offset += 258; // reserved
310
311	$ThisFileInfo['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
312	$offset += 1;
313
314	for ($track = 0; $track < $ThisFileInfo['flac']['CUESHEET']['number_tracks']; $track++) {
315	$TrackSampleOffset = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
316	$offset += 8;
317	$TrackNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
318	$offset += 1;
319
320	$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset;
321
322	$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($METAdataBlockData, $offset, 12);
323	$offset += 12;
324
325	$TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
326	$offset += 1;
327	$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80);
328	$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
329
330	$offset += 13; // reserved
331
332	$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
333	$offset += 1;
334
335	for ($index = 0; $index < $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
336	$IndexSampleOffset = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
337	$offset += 8;
338	$IndexNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
339	$offset += 1;
340
341	$offset += 3; // reserved
342
343	$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
344	}
345	}
346
347	unset($ThisFileInfo['flac']['CUESHEET']['raw']);
348
349	return true;
350	}
351
352
353	function FLACparsePICTURE($meta_data_block_data, &$ThisFileInfo) {
354	$picture = &$ThisFileInfo['flac']['PICTURE'][sizeof($ThisFileInfo['flac']['PICTURE']) - 1];
355
356	$offset = 0;
357
358	$picture['type'] = $this->FLACpictureTypeLookup(getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4)));
359	$offset += 4;
360
361	$length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
362	$offset += 4;
363
364	$picture['mime_type'] = substr($meta_data_block_data, $offset, $length);
365	$offset += $length;
366
367	$length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
368	$offset += 4;
369
370	$picture['description'] = substr($meta_data_block_data, $offset, $length);
371	$offset += $length;
372
373	$picture['width'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
374	$offset += 4;
375
376	$picture['height'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
377	$offset += 4;
378
379	$picture['color_depth'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
380	$offset += 4;
381
382	$picture['colors_indexed'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
383	$offset += 4;
384
385	$length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
386	$offset += 4;
387
388	$picture['image_data'] = substr($meta_data_block_data, $offset, $length);
389	$offset += $length;
390
391	unset($ThisFileInfo['flac']['PICTURE']['raw']);
392
393	return true;
394	}
395	}
396
397	?>

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