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.aac.php // |
---|
11 | // module for analyzing AAC Audio files // |
---|
12 | // dependencies: NONE // |
---|
13 | // /// |
---|
14 | ///////////////////////////////////////////////////////////////// |
---|
15 | |
---|
16 | |
---|
17 | class getid3_aac |
---|
18 | { |
---|
19 | |
---|
20 | // new combined constructor |
---|
21 | function getid3_aac(&$fd, &$ThisFileInfo, $option) { |
---|
22 | |
---|
23 | if ($option === 'adif') { |
---|
24 | $this->getAACADIFheaderFilepointer($fd, $ThisFileInfo); |
---|
25 | } |
---|
26 | elseif ($option === 'adts') { |
---|
27 | $this->getAACADTSheaderFilepointer($fd, $ThisFileInfo); |
---|
28 | } |
---|
29 | } |
---|
30 | |
---|
31 | |
---|
32 | |
---|
33 | function getAACADIFheaderFilepointer(&$fd, &$ThisFileInfo) { |
---|
34 | $ThisFileInfo['fileformat'] = 'aac'; |
---|
35 | $ThisFileInfo['audio']['dataformat'] = 'aac'; |
---|
36 | $ThisFileInfo['audio']['lossless'] = false; |
---|
37 | |
---|
38 | fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); |
---|
39 | $AACheader = fread($fd, 1024); |
---|
40 | $offset = 0; |
---|
41 | |
---|
42 | if (substr($AACheader, 0, 4) == 'ADIF') { |
---|
43 | |
---|
44 | // http://faac.sourceforge.net/wiki/index.php?page=ADIF |
---|
45 | |
---|
46 | // http://libmpeg.org/mpeg4/doc/w2203tfs.pdf |
---|
47 | // adif_header() { |
---|
48 | // adif_id 32 |
---|
49 | // copyright_id_present 1 |
---|
50 | // if( copyright_id_present ) |
---|
51 | // copyright_id 72 |
---|
52 | // original_copy 1 |
---|
53 | // home 1 |
---|
54 | // bitstream_type 1 |
---|
55 | // bitrate 23 |
---|
56 | // num_program_config_elements 4 |
---|
57 | // for (i = 0; i < num_program_config_elements + 1; i++ ) { |
---|
58 | // if( bitstream_type == '0' ) |
---|
59 | // adif_buffer_fullness 20 |
---|
60 | // program_config_element() |
---|
61 | // } |
---|
62 | // } |
---|
63 | |
---|
64 | $AACheaderBitstream = getid3_lib::BigEndian2Bin($AACheader); |
---|
65 | $bitoffset = 0; |
---|
66 | |
---|
67 | $ThisFileInfo['aac']['header_type'] = 'ADIF'; |
---|
68 | $bitoffset += 32; |
---|
69 | $ThisFileInfo['aac']['header']['mpeg_version'] = 4; |
---|
70 | |
---|
71 | $ThisFileInfo['aac']['header']['copyright'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); |
---|
72 | $bitoffset += 1; |
---|
73 | if ($ThisFileInfo['aac']['header']['copyright']) { |
---|
74 | $ThisFileInfo['aac']['header']['copyright_id'] = getid3_lib::Bin2String(substr($AACheaderBitstream, $bitoffset, 72)); |
---|
75 | $bitoffset += 72; |
---|
76 | } |
---|
77 | $ThisFileInfo['aac']['header']['original_copy'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); |
---|
78 | $bitoffset += 1; |
---|
79 | $ThisFileInfo['aac']['header']['home'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); |
---|
80 | $bitoffset += 1; |
---|
81 | $ThisFileInfo['aac']['header']['is_vbr'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); |
---|
82 | $bitoffset += 1; |
---|
83 | if ($ThisFileInfo['aac']['header']['is_vbr']) { |
---|
84 | $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; |
---|
85 | $ThisFileInfo['aac']['header']['bitrate_max'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23)); |
---|
86 | $bitoffset += 23; |
---|
87 | } else { |
---|
88 | $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; |
---|
89 | $ThisFileInfo['aac']['header']['bitrate'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23)); |
---|
90 | $bitoffset += 23; |
---|
91 | $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['aac']['header']['bitrate']; |
---|
92 | } |
---|
93 | if ($ThisFileInfo['audio']['bitrate'] == 0) { |
---|
94 | $ThisFileInfo['error'][] = 'Corrupt AAC file: bitrate_audio == zero'; |
---|
95 | return false; |
---|
96 | } |
---|
97 | $ThisFileInfo['aac']['header']['num_program_configs'] = 1 + getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
98 | $bitoffset += 4; |
---|
99 | |
---|
100 | for ($i = 0; $i < $ThisFileInfo['aac']['header']['num_program_configs']; $i++) { |
---|
101 | // http://www.audiocoding.com/wiki/index.php?page=program_config_element |
---|
102 | |
---|
103 | // buffer_fullness 20 |
---|
104 | |
---|
105 | // element_instance_tag 4 |
---|
106 | // object_type 2 |
---|
107 | // sampling_frequency_index 4 |
---|
108 | // num_front_channel_elements 4 |
---|
109 | // num_side_channel_elements 4 |
---|
110 | // num_back_channel_elements 4 |
---|
111 | // num_lfe_channel_elements 2 |
---|
112 | // num_assoc_data_elements 3 |
---|
113 | // num_valid_cc_elements 4 |
---|
114 | // mono_mixdown_present 1 |
---|
115 | // mono_mixdown_element_number 4 if mono_mixdown_present == 1 |
---|
116 | // stereo_mixdown_present 1 |
---|
117 | // stereo_mixdown_element_number 4 if stereo_mixdown_present == 1 |
---|
118 | // matrix_mixdown_idx_present 1 |
---|
119 | // matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1 |
---|
120 | // pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1 |
---|
121 | // for (i = 0; i < num_front_channel_elements; i++) { |
---|
122 | // front_element_is_cpe[i] 1 |
---|
123 | // front_element_tag_select[i] 4 |
---|
124 | // } |
---|
125 | // for (i = 0; i < num_side_channel_elements; i++) { |
---|
126 | // side_element_is_cpe[i] 1 |
---|
127 | // side_element_tag_select[i] 4 |
---|
128 | // } |
---|
129 | // for (i = 0; i < num_back_channel_elements; i++) { |
---|
130 | // back_element_is_cpe[i] 1 |
---|
131 | // back_element_tag_select[i] 4 |
---|
132 | // } |
---|
133 | // for (i = 0; i < num_lfe_channel_elements; i++) { |
---|
134 | // lfe_element_tag_select[i] 4 |
---|
135 | // } |
---|
136 | // for (i = 0; i < num_assoc_data_elements; i++) { |
---|
137 | // assoc_data_element_tag_select[i] 4 |
---|
138 | // } |
---|
139 | // for (i = 0; i < num_valid_cc_elements; i++) { |
---|
140 | // cc_element_is_ind_sw[i] 1 |
---|
141 | // valid_cc_element_tag_select[i] 4 |
---|
142 | // } |
---|
143 | // byte_alignment() VAR |
---|
144 | // comment_field_bytes 8 |
---|
145 | // for (i = 0; i < comment_field_bytes; i++) { |
---|
146 | // comment_field_data[i] 8 |
---|
147 | // } |
---|
148 | |
---|
149 | if (!$ThisFileInfo['aac']['header']['is_vbr']) { |
---|
150 | $ThisFileInfo['aac']['program_configs'][$i]['buffer_fullness'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 20)); |
---|
151 | $bitoffset += 20; |
---|
152 | } |
---|
153 | $ThisFileInfo['aac']['program_configs'][$i]['element_instance_tag'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
154 | $bitoffset += 4; |
---|
155 | $ThisFileInfo['aac']['program_configs'][$i]['object_type'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
156 | $bitoffset += 2; |
---|
157 | $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
158 | $bitoffset += 4; |
---|
159 | $ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
160 | $bitoffset += 4; |
---|
161 | $ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
162 | $bitoffset += 4; |
---|
163 | $ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
164 | $bitoffset += 4; |
---|
165 | $ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
166 | $bitoffset += 2; |
---|
167 | $ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3)); |
---|
168 | $bitoffset += 3; |
---|
169 | $ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
170 | $bitoffset += 4; |
---|
171 | $ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
172 | $bitoffset += 1; |
---|
173 | if ($ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present']) { |
---|
174 | $ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
175 | $bitoffset += 4; |
---|
176 | } |
---|
177 | $ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
178 | $bitoffset += 1; |
---|
179 | if ($ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present']) { |
---|
180 | $ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
181 | $bitoffset += 4; |
---|
182 | } |
---|
183 | $ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
184 | $bitoffset += 1; |
---|
185 | if ($ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present']) { |
---|
186 | $ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
187 | $bitoffset += 2; |
---|
188 | $ThisFileInfo['aac']['program_configs'][$i]['pseudo_surround_enable'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
189 | $bitoffset += 1; |
---|
190 | } |
---|
191 | for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements']; $j++) { |
---|
192 | $ThisFileInfo['aac']['program_configs'][$i]['front_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
193 | $bitoffset += 1; |
---|
194 | $ThisFileInfo['aac']['program_configs'][$i]['front_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
195 | $bitoffset += 4; |
---|
196 | } |
---|
197 | for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements']; $j++) { |
---|
198 | $ThisFileInfo['aac']['program_configs'][$i]['side_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
199 | $bitoffset += 1; |
---|
200 | $ThisFileInfo['aac']['program_configs'][$i]['side_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
201 | $bitoffset += 4; |
---|
202 | } |
---|
203 | for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements']; $j++) { |
---|
204 | $ThisFileInfo['aac']['program_configs'][$i]['back_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
205 | $bitoffset += 1; |
---|
206 | $ThisFileInfo['aac']['program_configs'][$i]['back_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
207 | $bitoffset += 4; |
---|
208 | } |
---|
209 | for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements']; $j++) { |
---|
210 | $ThisFileInfo['aac']['program_configs'][$i]['lfe_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
211 | $bitoffset += 4; |
---|
212 | } |
---|
213 | for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements']; $j++) { |
---|
214 | $ThisFileInfo['aac']['program_configs'][$i]['assoc_data_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
215 | $bitoffset += 4; |
---|
216 | } |
---|
217 | for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements']; $j++) { |
---|
218 | $ThisFileInfo['aac']['program_configs'][$i]['cc_element_is_ind_sw'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
219 | $bitoffset += 1; |
---|
220 | $ThisFileInfo['aac']['program_configs'][$i]['valid_cc_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
221 | $bitoffset += 4; |
---|
222 | } |
---|
223 | |
---|
224 | $bitoffset = ceil($bitoffset / 8) * 8; |
---|
225 | |
---|
226 | $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 8)); |
---|
227 | $bitoffset += 8; |
---|
228 | $ThisFileInfo['aac']['program_configs'][$i]['comment_field'] = getid3_lib::Bin2String(substr($AACheaderBitstream, $bitoffset, 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'])); |
---|
229 | $bitoffset += 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes']; |
---|
230 | |
---|
231 | |
---|
232 | $ThisFileInfo['aac']['header']['profile_text'] = $this->AACprofileLookup($ThisFileInfo['aac']['program_configs'][$i]['object_type'], $ThisFileInfo['aac']['header']['mpeg_version']); |
---|
233 | $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency'] = $this->AACsampleRateLookup($ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index']); |
---|
234 | $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency']; |
---|
235 | $ThisFileInfo['audio']['channels'] = $this->AACchannelCountCalculate($ThisFileInfo['aac']['program_configs'][$i]); |
---|
236 | if ($ThisFileInfo['aac']['program_configs'][$i]['comment_field']) { |
---|
237 | $ThisFileInfo['aac']['comments'][] = $ThisFileInfo['aac']['program_configs'][$i]['comment_field']; |
---|
238 | } |
---|
239 | } |
---|
240 | $ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['audio']['bitrate']; |
---|
241 | |
---|
242 | $ThisFileInfo['audio']['encoder_options'] = $ThisFileInfo['aac']['header_type'].' '.$ThisFileInfo['aac']['header']['profile_text']; |
---|
243 | |
---|
244 | |
---|
245 | |
---|
246 | return true; |
---|
247 | |
---|
248 | } else { |
---|
249 | |
---|
250 | unset($ThisFileInfo['fileformat']); |
---|
251 | unset($ThisFileInfo['aac']); |
---|
252 | $ThisFileInfo['error'][] = 'AAC-ADIF synch not found at offset '.$ThisFileInfo['avdataoffset'].' (expected "ADIF", found "'.substr($AACheader, 0, 4).'" instead)'; |
---|
253 | return false; |
---|
254 | |
---|
255 | } |
---|
256 | |
---|
257 | } |
---|
258 | |
---|
259 | |
---|
260 | function getAACADTSheaderFilepointer(&$fd, &$ThisFileInfo, $MaxFramesToScan=1000000, $ReturnExtendedInfo=false) { |
---|
261 | // based loosely on code from AACfile by Jurgen Faul <jfaulØgmx.de> |
---|
262 | // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html |
---|
263 | |
---|
264 | |
---|
265 | // http://faac.sourceforge.net/wiki/index.php?page=ADTS |
---|
266 | |
---|
267 | // * ADTS Fixed Header: these don't change from frame to frame |
---|
268 | // syncword 12 always: '111111111111' |
---|
269 | // ID 1 0: MPEG-4, 1: MPEG-2 |
---|
270 | // layer 2 always: '00' |
---|
271 | // protection_absent 1 |
---|
272 | // profile 2 |
---|
273 | // sampling_frequency_index 4 |
---|
274 | // private_bit 1 |
---|
275 | // channel_configuration 3 |
---|
276 | // original/copy 1 |
---|
277 | // home 1 |
---|
278 | // emphasis 2 only if ID == 0 (ie MPEG-4) |
---|
279 | |
---|
280 | // * ADTS Variable Header: these can change from frame to frame |
---|
281 | // copyright_identification_bit 1 |
---|
282 | // copyright_identification_start 1 |
---|
283 | // aac_frame_length 13 length of the frame including header (in bytes) |
---|
284 | // adts_buffer_fullness 11 0x7FF indicates VBR |
---|
285 | // no_raw_data_blocks_in_frame 2 |
---|
286 | |
---|
287 | // * ADTS Error check |
---|
288 | // crc_check 16 only if protection_absent == 0 |
---|
289 | |
---|
290 | $byteoffset = 0; |
---|
291 | $framenumber = 0; |
---|
292 | |
---|
293 | // Init bit pattern array |
---|
294 | static $decbin = array(); |
---|
295 | |
---|
296 | // Populate $bindec |
---|
297 | for ($i = 0; $i < 256; $i++) { |
---|
298 | $decbin[chr($i)] = str_pad(decbin($i), 8, '0', STR_PAD_LEFT); |
---|
299 | } |
---|
300 | |
---|
301 | // used to calculate bitrate below |
---|
302 | $BitrateCache = array(); |
---|
303 | |
---|
304 | |
---|
305 | while (true) { |
---|
306 | // breaks out when end-of-file encountered, or invalid data found, |
---|
307 | // or MaxFramesToScan frames have been scanned |
---|
308 | |
---|
309 | if ($byteoffset >= pow(2, 31)) { |
---|
310 | $ThisFileInfo['warning'][] = 'Unable to parse AAC file beyond '.ftell($fd).' (PHP does not support file operations beyond 2GB)'; |
---|
311 | return false; |
---|
312 | } |
---|
313 | fseek($fd, $byteoffset, SEEK_SET); |
---|
314 | |
---|
315 | // First get substring |
---|
316 | $substring = fread($fd, 10); |
---|
317 | $substringlength = strlen($substring); |
---|
318 | if ($substringlength != 10) { |
---|
319 | $ThisFileInfo['error'][] = 'Failed to read 10 bytes at offset '.(ftell($fd) - $substringlength).' (only read '.$substringlength.' bytes)'; |
---|
320 | return false; |
---|
321 | } |
---|
322 | |
---|
323 | // Initialise $AACheaderBitstream |
---|
324 | $AACheaderBitstream = ''; |
---|
325 | |
---|
326 | // Loop thru substring chars |
---|
327 | for ($i = 0; $i < 10; $i++) { |
---|
328 | $AACheaderBitstream .= $decbin[$substring{$i}]; |
---|
329 | } |
---|
330 | |
---|
331 | $bitoffset = 0; |
---|
332 | |
---|
333 | $synctest = bindec(substr($AACheaderBitstream, $bitoffset, 12)); |
---|
334 | |
---|
335 | $bitoffset += 12; |
---|
336 | if ($synctest != 0x0FFF) { |
---|
337 | $ThisFileInfo['error'][] = 'Synch pattern (0x0FFF) not found at offset '.(ftell($fd) - 10).' (found 0x0'.strtoupper(dechex($synctest)).' instead)'; |
---|
338 | if ($ThisFileInfo['fileformat'] == 'aac') { |
---|
339 | return true; |
---|
340 | } |
---|
341 | return false; |
---|
342 | } |
---|
343 | |
---|
344 | // Gather info for first frame only - this takes time to do 1000 times! |
---|
345 | if ($framenumber > 0) { |
---|
346 | |
---|
347 | if (!$AACheaderBitstream[$bitoffset]) { |
---|
348 | |
---|
349 | // MPEG-4 |
---|
350 | $bitoffset += 20; |
---|
351 | |
---|
352 | } else { |
---|
353 | |
---|
354 | // MPEG-2 |
---|
355 | $bitoffset += 18; |
---|
356 | |
---|
357 | } |
---|
358 | |
---|
359 | } else { |
---|
360 | |
---|
361 | $ThisFileInfo['aac']['header_type'] = 'ADTS'; |
---|
362 | $ThisFileInfo['aac']['header']['synch'] = $synctest; |
---|
363 | $ThisFileInfo['fileformat'] = 'aac'; |
---|
364 | $ThisFileInfo['audio']['dataformat'] = 'aac'; |
---|
365 | |
---|
366 | $ThisFileInfo['aac']['header']['mpeg_version'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? 4 : 2); |
---|
367 | $bitoffset += 1; |
---|
368 | $ThisFileInfo['aac']['header']['layer'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
369 | $bitoffset += 2; |
---|
370 | if ($ThisFileInfo['aac']['header']['layer'] != 0) { |
---|
371 | $ThisFileInfo['error'][] = 'Layer error - expected 0x00, found 0x'.dechex($ThisFileInfo['aac']['header']['layer']).' instead'; |
---|
372 | return false; |
---|
373 | } |
---|
374 | $ThisFileInfo['aac']['header']['crc_present'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? true : false); |
---|
375 | $bitoffset += 1; |
---|
376 | $ThisFileInfo['aac']['header']['profile_id'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
377 | $bitoffset += 2; |
---|
378 | $ThisFileInfo['aac']['header']['profile_text'] = $this->AACprofileLookup($ThisFileInfo['aac']['header']['profile_id'], $ThisFileInfo['aac']['header']['mpeg_version']); |
---|
379 | |
---|
380 | $ThisFileInfo['aac']['header']['sample_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); |
---|
381 | $bitoffset += 4; |
---|
382 | $ThisFileInfo['aac']['header']['sample_frequency'] = $this->AACsampleRateLookup($ThisFileInfo['aac']['header']['sample_frequency_index']); |
---|
383 | if ($ThisFileInfo['aac']['header']['sample_frequency'] == 0) { |
---|
384 | $ThisFileInfo['error'][] = 'Corrupt AAC file: sample_frequency == zero'; |
---|
385 | return false; |
---|
386 | } |
---|
387 | $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['header']['sample_frequency']; |
---|
388 | |
---|
389 | $ThisFileInfo['aac']['header']['private'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
390 | $bitoffset += 1; |
---|
391 | $ThisFileInfo['aac']['header']['channel_configuration'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3)); |
---|
392 | $bitoffset += 3; |
---|
393 | $ThisFileInfo['audio']['channels'] = $ThisFileInfo['aac']['header']['channel_configuration']; |
---|
394 | $ThisFileInfo['aac']['header']['original'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
395 | $bitoffset += 1; |
---|
396 | $ThisFileInfo['aac']['header']['home'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
397 | $bitoffset += 1; |
---|
398 | |
---|
399 | if ($ThisFileInfo['aac']['header']['mpeg_version'] == 4) { |
---|
400 | $ThisFileInfo['aac']['header']['emphasis'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
401 | $bitoffset += 2; |
---|
402 | } |
---|
403 | |
---|
404 | if ($ReturnExtendedInfo) { |
---|
405 | |
---|
406 | $ThisFileInfo['aac'][$framenumber]['copyright_id_bit'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
407 | $bitoffset += 1; |
---|
408 | $ThisFileInfo['aac'][$framenumber]['copyright_id_start'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); |
---|
409 | $bitoffset += 1; |
---|
410 | |
---|
411 | } else { |
---|
412 | |
---|
413 | $bitoffset += 2; |
---|
414 | |
---|
415 | } |
---|
416 | |
---|
417 | } |
---|
418 | |
---|
419 | $FrameLength = bindec(substr($AACheaderBitstream, $bitoffset, 13)); |
---|
420 | |
---|
421 | if (!isset($BitrateCache[$FrameLength])) { |
---|
422 | $BitrateCache[$FrameLength] = ($ThisFileInfo['aac']['header']['sample_frequency'] / 1024) * $FrameLength * 8; |
---|
423 | } |
---|
424 | @$ThisFileInfo['aac']['bitrate_distribution'][$BitrateCache[$FrameLength]]++; |
---|
425 | |
---|
426 | $ThisFileInfo['aac'][$framenumber]['aac_frame_length'] = $FrameLength; |
---|
427 | $bitoffset += 13; |
---|
428 | $ThisFileInfo['aac'][$framenumber]['adts_buffer_fullness'] = bindec(substr($AACheaderBitstream, $bitoffset, 11)); |
---|
429 | $bitoffset += 11; |
---|
430 | if ($ThisFileInfo['aac'][$framenumber]['adts_buffer_fullness'] == 0x07FF) { |
---|
431 | $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; |
---|
432 | } else { |
---|
433 | $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; |
---|
434 | } |
---|
435 | $ThisFileInfo['aac'][$framenumber]['num_raw_data_blocks'] = bindec(substr($AACheaderBitstream, $bitoffset, 2)); |
---|
436 | $bitoffset += 2; |
---|
437 | |
---|
438 | if ($ThisFileInfo['aac']['header']['crc_present']) { |
---|
439 | //$ThisFileInfo['aac'][$framenumber]['crc'] = bindec(substr($AACheaderBitstream, $bitoffset, 16)); |
---|
440 | $bitoffset += 16; |
---|
441 | } |
---|
442 | |
---|
443 | if (!$ReturnExtendedInfo) { |
---|
444 | unset($ThisFileInfo['aac'][$framenumber]); |
---|
445 | } |
---|
446 | |
---|
447 | $byteoffset += $FrameLength; |
---|
448 | if ((++$framenumber < $MaxFramesToScan) && (($byteoffset + 10) < $ThisFileInfo['avdataend'])) { |
---|
449 | |
---|
450 | // keep scanning |
---|
451 | |
---|
452 | } else { |
---|
453 | |
---|
454 | $ThisFileInfo['aac']['frames'] = $framenumber; |
---|
455 | $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] / $byteoffset) * (($framenumber * 1024) / $ThisFileInfo['aac']['header']['sample_frequency']); // (1 / % of file scanned) * (samples / (samples/sec)) = seconds |
---|
456 | if ($ThisFileInfo['playtime_seconds'] == 0) { |
---|
457 | $ThisFileInfo['error'][] = 'Corrupt AAC file: playtime_seconds == zero'; |
---|
458 | return false; |
---|
459 | } |
---|
460 | $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds']; |
---|
461 | ksort($ThisFileInfo['aac']['bitrate_distribution']); |
---|
462 | |
---|
463 | $ThisFileInfo['audio']['encoder_options'] = $ThisFileInfo['aac']['header_type'].' '.$ThisFileInfo['aac']['header']['profile_text']; |
---|
464 | |
---|
465 | return true; |
---|
466 | |
---|
467 | } |
---|
468 | } |
---|
469 | // should never get here. |
---|
470 | } |
---|
471 | |
---|
472 | function AACsampleRateLookup($samplerateid) { |
---|
473 | static $AACsampleRateLookup = array(); |
---|
474 | if (empty($AACsampleRateLookup)) { |
---|
475 | $AACsampleRateLookup[0] = 96000; |
---|
476 | $AACsampleRateLookup[1] = 88200; |
---|
477 | $AACsampleRateLookup[2] = 64000; |
---|
478 | $AACsampleRateLookup[3] = 48000; |
---|
479 | $AACsampleRateLookup[4] = 44100; |
---|
480 | $AACsampleRateLookup[5] = 32000; |
---|
481 | $AACsampleRateLookup[6] = 24000; |
---|
482 | $AACsampleRateLookup[7] = 22050; |
---|
483 | $AACsampleRateLookup[8] = 16000; |
---|
484 | $AACsampleRateLookup[9] = 12000; |
---|
485 | $AACsampleRateLookup[10] = 11025; |
---|
486 | $AACsampleRateLookup[11] = 8000; |
---|
487 | $AACsampleRateLookup[12] = 0; |
---|
488 | $AACsampleRateLookup[13] = 0; |
---|
489 | $AACsampleRateLookup[14] = 0; |
---|
490 | $AACsampleRateLookup[15] = 0; |
---|
491 | } |
---|
492 | return (isset($AACsampleRateLookup[$samplerateid]) ? $AACsampleRateLookup[$samplerateid] : 'invalid'); |
---|
493 | } |
---|
494 | |
---|
495 | function AACprofileLookup($profileid, $mpegversion) { |
---|
496 | static $AACprofileLookup = array(); |
---|
497 | if (empty($AACprofileLookup)) { |
---|
498 | $AACprofileLookup[2][0] = 'Main profile'; |
---|
499 | $AACprofileLookup[2][1] = 'Low Complexity profile (LC)'; |
---|
500 | $AACprofileLookup[2][2] = 'Scalable Sample Rate profile (SSR)'; |
---|
501 | $AACprofileLookup[2][3] = '(reserved)'; |
---|
502 | $AACprofileLookup[4][0] = 'AAC_MAIN'; |
---|
503 | $AACprofileLookup[4][1] = 'AAC_LC'; |
---|
504 | $AACprofileLookup[4][2] = 'AAC_SSR'; |
---|
505 | $AACprofileLookup[4][3] = 'AAC_LTP'; |
---|
506 | } |
---|
507 | return (isset($AACprofileLookup[$mpegversion][$profileid]) ? $AACprofileLookup[$mpegversion][$profileid] : 'invalid'); |
---|
508 | } |
---|
509 | |
---|
510 | function AACchannelCountCalculate($program_configs) { |
---|
511 | $channels = 0; |
---|
512 | for ($i = 0; $i < $program_configs['num_front_channel_elements']; $i++) { |
---|
513 | $channels++; |
---|
514 | if ($program_configs['front_element_is_cpe'][$i]) { |
---|
515 | // each front element is channel pair (CPE = Channel Pair Element) |
---|
516 | $channels++; |
---|
517 | } |
---|
518 | } |
---|
519 | for ($i = 0; $i < $program_configs['num_side_channel_elements']; $i++) { |
---|
520 | $channels++; |
---|
521 | if ($program_configs['side_element_is_cpe'][$i]) { |
---|
522 | // each side element is channel pair (CPE = Channel Pair Element) |
---|
523 | $channels++; |
---|
524 | } |
---|
525 | } |
---|
526 | for ($i = 0; $i < $program_configs['num_back_channel_elements']; $i++) { |
---|
527 | $channels++; |
---|
528 | if ($program_configs['back_element_is_cpe'][$i]) { |
---|
529 | // each back element is channel pair (CPE = Channel Pair Element) |
---|
530 | $channels++; |
---|
531 | } |
---|
532 | } |
---|
533 | for ($i = 0; $i < $program_configs['num_lfe_channel_elements']; $i++) { |
---|
534 | $channels++; |
---|
535 | } |
---|
536 | return $channels; |
---|
537 | } |
---|
538 | |
---|
539 | } |
---|
540 | |
---|
541 | |
---|
542 | ?> |
---|