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module.audio.la.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:keywords set to `Author Date Id Revision`
File size: 9.9 KB

Line
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.la.php //
11	// module for analyzing LA audio files //
12	// dependencies: module.audio.riff.php //
13	// ///
14	/////////////////////////////////////////////////////////////////
15
16	getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
17
18	class getid3_la
19	{
20
21	function getid3_la(&$fd, &$ThisFileInfo) {
22	$offset = 0;
23	fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
24	$rawdata = fread($fd, GETID3_FREAD_BUFFER_SIZE);
25
26	switch (substr($rawdata, $offset, 4)) {
27	case 'LA02':
28	case 'LA03':
29	case 'LA04':
30	$ThisFileInfo['fileformat'] = 'la';
31	$ThisFileInfo['audio']['dataformat'] = 'la';
32	$ThisFileInfo['audio']['lossless'] = true;
33
34	$ThisFileInfo['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1);
35	$ThisFileInfo['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1);
36	$ThisFileInfo['la']['version'] = (float) $ThisFileInfo['la']['version_major'] + ($ThisFileInfo['la']['version_minor'] / 10);
37	$offset += 4;
38
39	$ThisFileInfo['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
40	$offset += 4;
41	if ($ThisFileInfo['la']['uncompressed_size'] == 0) {
42	$ThisFileInfo['error'][] = 'Corrupt LA file: uncompressed_size == zero';
43	return false;
44	}
45
46	$WAVEchunk = substr($rawdata, $offset, 4);
47	if ($WAVEchunk !== 'WAVE') {
48	$ThisFileInfo['error'][] = 'Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.';
49	return false;
50	}
51	$offset += 4;
52
53	$ThisFileInfo['la']['fmt_size'] = 24;
54	if ($ThisFileInfo['la']['version'] >= 0.3) {
55
56	$ThisFileInfo['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
57	$ThisFileInfo['la']['header_size'] = 49 + $ThisFileInfo['la']['fmt_size'] - 24;
58	$offset += 4;
59
60	} else {
61
62	// version 0.2 didn't support additional data blocks
63	$ThisFileInfo['la']['header_size'] = 41;
64
65	}
66
67	$fmt_chunk = substr($rawdata, $offset, 4);
68	if ($fmt_chunk !== 'fmt ') {
69	$ThisFileInfo['error'][] = 'Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.';
70	return false;
71	}
72	$offset += 4;
73	$fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
74	$offset += 4;
75
76	$ThisFileInfo['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
77	$offset += 2;
78
79	$ThisFileInfo['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
80	$offset += 2;
81	if ($ThisFileInfo['la']['channels'] == 0) {
82	$ThisFileInfo['error'][] = 'Corrupt LA file: channels == zero';
83	return false;
84	}
85
86	$ThisFileInfo['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
87	$offset += 4;
88	if ($ThisFileInfo['la']['sample_rate'] == 0) {
89	$ThisFileInfo['error'][] = 'Corrupt LA file: sample_rate == zero';
90	return false;
91	}
92
93	$ThisFileInfo['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
94	$offset += 4;
95	$ThisFileInfo['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
96	$offset += 2;
97	$ThisFileInfo['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
98	$offset += 2;
99
100	$ThisFileInfo['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
101	$offset += 4;
102
103	$ThisFileInfo['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1));
104	$offset += 1;
105	$ThisFileInfo['la']['flags']['seekable'] = (bool) ($ThisFileInfo['la']['raw']['flags'] & 0x01);
106	if ($ThisFileInfo['la']['version'] >= 0.4) {
107	$ThisFileInfo['la']['flags']['high_compression'] = (bool) ($ThisFileInfo['la']['raw']['flags'] & 0x02);
108	}
109
110	$ThisFileInfo['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
111	$offset += 4;
112
113	// mikeØbevin*de
114	// Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
115	// in earlier versions. A seekpoint is added every blocksize * seekevery
116	// samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
117	// give the number of bytes used for the seekpoints. Of course, if seeking
118	// is disabled, there are no seekpoints stored.
119	if ($ThisFileInfo['la']['version'] >= 0.4) {
120	$ThisFileInfo['la']['blocksize'] = 61440;
121	$ThisFileInfo['la']['seekevery'] = 19;
122	} else {
123	$ThisFileInfo['la']['blocksize'] = 73728;
124	$ThisFileInfo['la']['seekevery'] = 16;
125	}
126
127	$ThisFileInfo['la']['seekpoint_count'] = 0;
128	if ($ThisFileInfo['la']['flags']['seekable']) {
129	$ThisFileInfo['la']['seekpoint_count'] = floor($ThisFileInfo['la']['samples'] / ($ThisFileInfo['la']['blocksize'] * $ThisFileInfo['la']['seekevery']));
130
131	for ($i = 0; $i < $ThisFileInfo['la']['seekpoint_count']; $i++) {
132	$ThisFileInfo['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
133	$offset += 4;
134	}
135	}
136
137	if ($ThisFileInfo['la']['version'] >= 0.3) {
138
139	// Following the main header information, the program outputs all of the
140	// seekpoints. Following these is what I called the 'footer start',
141	// i.e. the position immediately after the La audio data is finished.
142	$ThisFileInfo['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
143	$offset += 4;
144
145	if ($ThisFileInfo['la']['footerstart'] > $ThisFileInfo['filesize']) {
146	$ThisFileInfo['warning'][] = 'FooterStart value points to offset '.$ThisFileInfo['la']['footerstart'].' which is beyond end-of-file ('.$ThisFileInfo['filesize'].')';
147	$ThisFileInfo['la']['footerstart'] = $ThisFileInfo['filesize'];
148	}
149
150	} else {
151
152	// La v0.2 didn't have FooterStart value
153	$ThisFileInfo['la']['footerstart'] = $ThisFileInfo['avdataend'];
154
155	}
156
157	if ($ThisFileInfo['la']['footerstart'] < $ThisFileInfo['avdataend']) {
158	if ($RIFFtempfilename = tempnam('*', 'id3')) {
159	if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) {
160	$RIFFdata = 'WAVE';
161	if ($ThisFileInfo['la']['version'] == 0.2) {
162	$RIFFdata .= substr($rawdata, 12, 24);
163	} else {
164	$RIFFdata .= substr($rawdata, 16, 24);
165	}
166	if ($ThisFileInfo['la']['footerstart'] < $ThisFileInfo['avdataend']) {
167	fseek($fd, $ThisFileInfo['la']['footerstart'], SEEK_SET);
168	$RIFFdata .= fread($fd, $ThisFileInfo['avdataend'] - $ThisFileInfo['la']['footerstart']);
169	}
170	$RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata;
171	fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata));
172	$dummy = $ThisFileInfo;
173	$dummy['filesize'] = strlen($RIFFdata);
174	$dummy['avdataoffset'] = 0;
175	$dummy['avdataend'] = $dummy['filesize'];
176
177	$riff = new getid3_riff($RIFF_fp, $dummy);
178	if (empty($dummy['error'])) {
179	$ThisFileInfo['riff'] = $dummy['riff'];
180	} else {
181	$ThisFileInfo['warning'][] = 'Error parsing RIFF portion of La file: '.implode($dummy['error']);
182	}
183	unset($riff);
184	unset($dummy);
185	fclose($RIFF_fp);
186	}
187	unlink($RIFFtempfilename);
188	}
189	}
190
191	// $ThisFileInfo['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway
192	$ThisFileInfo['avdataend'] = $ThisFileInfo['avdataoffset'] + $ThisFileInfo['la']['footerstart'];
193	$ThisFileInfo['avdataoffset'] = $ThisFileInfo['avdataoffset'] + $offset;
194
195	//$ThisFileInfo['la']['codec'] = RIFFwFormatTagLookup($ThisFileInfo['la']['raw']['format']);
196	$ThisFileInfo['la']['compression_ratio'] = (float) (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $ThisFileInfo['la']['uncompressed_size']);
197	$ThisFileInfo['playtime_seconds'] = (float) ($ThisFileInfo['la']['samples'] / $ThisFileInfo['la']['sample_rate']) / $ThisFileInfo['la']['channels'];
198	if ($ThisFileInfo['playtime_seconds'] == 0) {
199	$ThisFileInfo['error'][] = 'Corrupt LA file: playtime_seconds == zero';
200	return false;
201	}
202
203	$ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['playtime_seconds'];
204	//$ThisFileInfo['audio']['codec'] = $ThisFileInfo['la']['codec'];
205	$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['la']['bits_per_sample'];
206	break;
207
208	default:
209	if (substr($rawdata, $offset, 2) == 'LA') {
210	$ThisFileInfo['error'][] = 'This version of getID3() (v'.GETID3_VERSION.') doesn\'t support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.';
211	} else {
212	$ThisFileInfo['error'][] = 'Not a LA (Lossless-Audio) file';
213	}
214	return false;
215	break;
216	}
217
218	$ThisFileInfo['audio']['channels'] = $ThisFileInfo['la']['channels'];
219	$ThisFileInfo['audio']['sample_rate'] = (int) $ThisFileInfo['la']['sample_rate'];
220	$ThisFileInfo['audio']['encoder'] = 'LA v'.$ThisFileInfo['la']['version'];
221
222	return true;
223	}
224
225	}
226
227
228	?>

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source: extensions/charlies_content/getid3/getid3/module.audio.la.php @ 3544

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