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86525f0f | 1 | // $Id$ |
2 | ||
31a920d3 | 3 | /************************************************************************** |
4 | * This file is property of and copyright by the ALICE HLT Project * | |
5 | * All rights reserved. * | |
6 | * * | |
7 | * Primary Authors: Per Thomas Hille <perthi@fys.uio.no> * | |
86525f0f | 8 | * Oystein Djuvsland <oystein.djuvsland@gmail.com> * |
31a920d3 | 9 | * * |
10 | * Permission to use, copy, modify and distribute this software and its * | |
11 | * documentation strictly for non-commercial purposes is hereby granted * | |
12 | * without fee, provided that the above copyright notice appears in all * | |
13 | * copies and that both the copyright notice and this permission notice * | |
14 | * appear in the supporting documentation. The authors make no claims * | |
15 | * about the suitability of this software for any purpose. It is * | |
16 | * provided "as is" without express or implied warranty. * | |
17 | **************************************************************************/ | |
18 | ||
86525f0f | 19 | /** |
20 | @file AliAltroDocoder.cxx | |
21 | @author Per Thomas Hille, Oystein Djuvsland | |
22 | @date | |
23 | @brief High performance decoder class for the RCU/Altro data format | |
24 | */ | |
25 | ||
26 | #include <cassert> | |
31a920d3 | 27 | #include <Riostream.h> |
28 | #include "AliAltroDecoder.h" | |
29 | #include "AliAltroData.h" | |
86525f0f | 30 | #include "AliLog.h" |
31a920d3 | 31 | |
ac672c4c | 32 | // Class for fast decoding of RCU/Altro raw data format (DDL format) |
33 | // to PC readable form. The decoding is done in 3 steps. | |
86525f0f | 34 | // 1) The RCU payload consist of a variable number of 160 bit words |
35 | // denoted a DDL block. All the DDL blocks of an RCU payload are transformed | |
36 | // into 16 bit integers and stored into a buffer of integers big enought to contain the | |
ac672c4c | 37 | // biggest number of samples possible |
38 | // 2) The decoded buffer is then accesible for the NextChannel functions wich reads | |
39 | // the altro channel data (samples) contained in the payload. The first call to NextChannel gives the | |
86525f0f | 40 | // last altro channel of the back linked list, the next call the second last channel ..etc until |
41 | // all channels are read. | |
ac672c4c | 42 | // 3) (optional) For each Altro channel one chan invoke the member function NextBunch which gives on first call |
43 | // The last bunch (the bunch with the highest timestamp), on next call the second last bunch..etc | |
44 | // untill all bunches are read | |
45 | ||
46 | ||
31a920d3 | 47 | ClassImp(AliAltroDecoder) |
48 | ||
49 | AliAltroDecoder::AliAltroDecoder() : f32DtaPtr(0), | |
ebf7cafe | 50 | f8DtaPtr(0), |
ac672c4c | 51 | fkN32HeaderWords(8), |
ebf7cafe | 52 | fN40AltroWords(0), |
53 | fN40RcuAltroWords(0), | |
54 | fNDDLBlocks(0), | |
55 | f32LastDDLBlockSize(5), | |
86525f0f | 56 | f8PayloadSize(0), |
ebf7cafe | 57 | fOutBufferIndex(0), |
58 | fSize(0), | |
59 | fNAltro10bitWords(0), | |
60 | fComplete(0), | |
61 | fInComplete(0), | |
62 | fDecodeIfCorruptedTrailer(kTRUE), | |
63 | fIsDecoded(kFALSE), | |
49f90cc3 | 64 | fIsFatalCorruptedTrailer(kTRUE) |
31a920d3 | 65 | { |
ac672c4c | 66 | // Default constructor |
31a920d3 | 67 | } |
68 | ||
69 | ||
70 | AliAltroDecoder::~AliAltroDecoder() | |
71 | { | |
ac672c4c | 72 | // Default destructor |
31a920d3 | 73 | } |
74 | ||
75 | ||
ac672c4c | 76 | Bool_t AliAltroDecoder::CheckPayloadTrailer() const |
31a920d3 | 77 | { |
86525f0f | 78 | //Check consistency between the number of 40 bit altro words given by |
ac672c4c | 79 | //the RCU payload and the number of 40 bit words calculated from the size of the RCU payload. |
80 | ||
31a920d3 | 81 | if(fN40AltroWords != fN40RcuAltroWords) |
82 | { | |
83 | return kFALSE; | |
84 | } | |
85 | else | |
86 | { | |
87 | return kTRUE; | |
88 | } | |
89 | } | |
90 | ||
91 | ||
92 | Bool_t AliAltroDecoder::Decode() | |
ebf7cafe | 93 | { |
86525f0f | 94 | // Decodes the RCU payload (all altro channels in one go) from the DDL/Altro |
95 | // format to PC readable format. | |
96 | // The 10 bit words of the 40/10 bit Altro format are transformed to separated | |
97 | // integers. | |
ac672c4c | 98 | |
ebf7cafe | 99 | if( fIsFatalCorruptedTrailer == kTRUE) |
31a920d3 | 100 | { |
987d6d62 | 101 | // printf("\n AliAltroDecoder::Decode(), WARNING, attempt to decode badly corrupted data\n"); |
102 | // printf("\n AliAltroDecoder::Decode(). Please check on the return value (-1 if fataly corrupted) of the SetMemory() function\n"); | |
ebf7cafe | 103 | return kFALSE; |
104 | } | |
817c796a | 105 | else if (!f8DtaPtr || !f32DtaPtr || |
106 | (UChar_t*)f32DtaPtr < f8DtaPtr-fSize || | |
107 | (UChar_t*)f32DtaPtr > f8DtaPtr) | |
108 | { | |
109 | return kFALSE; | |
110 | } | |
ebf7cafe | 111 | else |
31a920d3 | 112 | { |
ebf7cafe | 113 | // see header file for class documentation |
114 | fComplete = 0; | |
115 | fInComplete = 0; | |
116 | ||
ac672c4c | 117 | Int_t tmpcnt = CountAAApaddings(); |
31a920d3 | 118 | |
ebf7cafe | 119 | if(tmpcnt == 3) |
120 | { | |
121 | fN40AltroWords = fN40AltroWords -1; | |
122 | } | |
123 | else if(tmpcnt == 5) | |
124 | { | |
125 | fN40AltroWords = fN40AltroWords -2; | |
126 | } | |
127 | else if(tmpcnt == 8) | |
128 | { | |
129 | fN40AltroWords = fN40AltroWords -3; | |
130 | } | |
31a920d3 | 131 | |
ebf7cafe | 132 | if( ((CheckPayloadTrailer() == kTRUE) || fDecodeIfCorruptedTrailer == kTRUE ) && (fSize > 32) ) |
31a920d3 | 133 | { |
ebf7cafe | 134 | // fDDLBlockCnt = 0; |
135 | fOutBufferIndex = 0; | |
136 | ||
137 | for(Int_t i = 0; i < fNDDLBlocks; i++) | |
138 | { | |
139 | DecodeDDLBlock(); | |
140 | } | |
31a920d3 | 141 | |
ebf7cafe | 142 | DecodeLastDDLBlock(); |
143 | fOutBufferIndex = fN40AltroWords*4 - 1; | |
31a920d3 | 144 | |
ebf7cafe | 145 | // DumpData(fOutBuffer, 400,4); |
31a920d3 | 146 | |
ebf7cafe | 147 | fIsDecoded = kTRUE; |
148 | return kTRUE; | |
149 | } | |
150 | ||
151 | else | |
152 | { | |
987d6d62 | 153 | // cout <<" ERROR: data integrity check failed, discarding data" << endl; |
154 | // cout << "Size of datablock is " << fSize << endl; | |
155 | // cout << "fN40AltroWords = " << fN40AltroWords << endl; | |
156 | // cout << "fN40RcuAltroWords = " << fN40RcuAltroWords << endl; | |
ebf7cafe | 157 | return kFALSE; |
158 | } | |
49f90cc3 | 159 | |
31a920d3 | 160 | } |
161 | } | |
162 | ||
163 | ||
164 | Bool_t AliAltroDecoder::NextChannel(AliAltroData *altroDataPtr) | |
165 | { | |
ac672c4c | 166 | // Reads the next altro channel in the RCU payload after the RCU payload |
86525f0f | 167 | // has been decoded. The channels are read starting from the end (backlinked list) |
168 | // Returns kTRUE as long as ther are unread channels in the payload | |
169 | // Returns kFALSE when all the channels have been read. | |
ac672c4c | 170 | |
ebf7cafe | 171 | if(fIsFatalCorruptedTrailer == kTRUE) |
31a920d3 | 172 | { |
987d6d62 | 173 | // printf("\n AliAltroDecoder::NextChannel(), WARNING, attempt to decode badly corrupted data\n"); |
174 | // printf("\n AliAltroDecoder::NextChannel(), Please check on the return value (-1 if fataly corrupted) of the SetMemory() function\n"); | |
ebf7cafe | 175 | return kFALSE; |
176 | } | |
177 | ||
178 | else | |
31a920d3 | 179 | { |
31a920d3 | 180 | |
ebf7cafe | 181 | if(fIsDecoded != kTRUE) |
182 | { | |
987d6d62 | 183 | // cout <<"AliAltroDecoder::NextChanne, WARNING, buffer was not decoded, decoding now.. "<< endl; |
ebf7cafe | 184 | Decode(); |
185 | } | |
31a920d3 | 186 | |
86525f0f | 187 | // an altro block must constist of at least 2 40bit words: |
188 | // - 40bit Altro trailer | |
189 | // - at least 3 10bit words (bunch length, time bin, signal) padded to 40 bit | |
190 | // we are reading backwards, so the index is already 1 inside the block | |
191 | if(fOutBufferIndex >= 7) | |
31a920d3 | 192 | { |
ebf7cafe | 193 | if((fOutBuffer[fOutBufferIndex] << 4 ) | ((fOutBuffer[fOutBufferIndex-1] & 0x3c0) >> 6) == 0x2aaa) |
194 | { | |
195 | altroDataPtr->SetIsComplete(kTRUE); | |
196 | fComplete ++; | |
197 | } | |
198 | else | |
199 | { | |
200 | altroDataPtr->SetIsComplete(kFALSE); | |
201 | fInComplete ++; | |
202 | } | |
203 | ||
204 | fOutBufferIndex --; | |
205 | fNAltro10bitWords = ( (fOutBuffer[fOutBufferIndex] & 0x3f) << 4 ) | ((fOutBuffer[fOutBufferIndex -1] & (0xF << 6)) >> 6) ; | |
206 | fOutBufferIndex --; | |
207 | altroDataPtr->SetHadd( ((fOutBuffer[fOutBufferIndex] & 0x3)) << 10 | ( fOutBuffer[fOutBufferIndex-1] ) ); | |
208 | ||
209 | fOutBufferIndex --; | |
210 | ||
211 | if(fNAltro10bitWords%4 == 0) | |
212 | { | |
213 | fOutBufferIndex = fOutBufferIndex - fNAltro10bitWords; | |
214 | } | |
215 | else | |
216 | { | |
217 | fOutBufferIndex = fOutBufferIndex - fNAltro10bitWords -(4 - fNAltro10bitWords%4); | |
218 | } | |
219 | ||
84111923 | 220 | |
49f90cc3 | 221 | if(fOutBufferIndex >= 0) |
84111923 | 222 | { |
223 | ||
224 | //cout << " AliAltroDecoder::NextChannel fOutBufferIndex =" << fOutBufferIndex << endl; | |
225 | // printf( "AliAltroDecoder::NextChannel fOutBufferIndex = %d", fOutBufferIndex); | |
226 | altroDataPtr->SetData( &fOutBuffer[fOutBufferIndex] ); | |
49f90cc3 | 227 | if(fOutBufferIndex > 0) fOutBufferIndex --; |
84111923 | 228 | altroDataPtr->SetDataSize( fNAltro10bitWords ); |
229 | return kTRUE; | |
230 | } | |
231 | else | |
232 | { | |
233 | //TODO write a fatal log message when this happends | |
234 | return kFALSE; | |
235 | } | |
86525f0f | 236 | |
ebf7cafe | 237 | |
31a920d3 | 238 | } |
239 | else | |
240 | { | |
ebf7cafe | 241 | return kFALSE; |
31a920d3 | 242 | } |
243 | ||
31a920d3 | 244 | } |
245 | } | |
246 | ||
31a920d3 | 247 | |
ac672c4c | 248 | Int_t AliAltroDecoder::CountAAApaddings() const |
31a920d3 | 249 | { |
ac672c4c | 250 | // Use for simulated data only. |
251 | // Patch for incorrectly simulated data. Counts the number of | |
252 | // 2aaa word in the trailer of the payload and tries to figure out | |
253 | // the correct number of 40 bit altro words in the RCU pauload | |
86525f0f | 254 | // |
255 | // The simulated raw data differs from the real data by a number | |
256 | // of additional 0x2aa words between the Altro payload and the | |
257 | // RCU trailer. This is most likely to bring the total number of | |
258 | // bytes to a common multiple of 4 and 5. | |
ac672c4c | 259 | |
86525f0f | 260 | UShort_t *tailPtr= (UShort_t *)((UChar_t*)f32DtaPtr + f8PayloadSize); |
31a920d3 | 261 | Int_t cnt = 0; |
262 | ||
263 | tailPtr --; | |
264 | ||
265 | while(*tailPtr == 0xaaaa) | |
266 | { | |
267 | cnt ++; | |
268 | tailPtr --; | |
269 | } | |
270 | ||
271 | tailPtr = tailPtr + cnt +1; | |
272 | ||
273 | return cnt; | |
274 | } | |
275 | ||
276 | ||
277 | Float_t AliAltroDecoder::GetFailureRate() | |
278 | { | |
ac672c4c | 279 | // Prints to stdout the percent of altroblocks that |
280 | // is missing the 2aaa trailer. | |
281 | ||
31a920d3 | 282 | Float_t tmp = 0; |
987d6d62 | 283 | // cout << "Number of Complete channles = " << fComplete <<endl; |
284 | // cout << "Number of InComplete channles = " << fInComplete <<endl; | |
31a920d3 | 285 | tmp = (100*(Float_t)fInComplete)/((Float_t)fComplete + (Float_t)fInComplete); |
987d6d62 | 286 | // cout <<"There are "<< tmp <<"% incomplete channels"<<endl; |
31a920d3 | 287 | return tmp; |
288 | } | |
289 | ||
290 | ||
291 | void AliAltroDecoder::PrintInfo(AliAltroData &altrodata, Int_t n, Int_t nPerLine) | |
292 | { | |
ac672c4c | 293 | // prints data and address information contained in altrodata |
294 | // to the standard output | |
295 | ||
987d6d62 | 296 | // cout << "altrodata.fDataSize = " << altrodata.GetDataSize() << endl; |
297 | // cout << "altrodata.fHadd = " << altrodata.GetHadd() <<endl; | |
31a920d3 | 298 | const UInt_t* data = altrodata.GetData(); |
299 | for(Int_t i= 0; i< n; i++) | |
300 | { | |
301 | if( (i%nPerLine == 0) && (i != 0) ) | |
302 | { | |
303 | printf("\n"); | |
304 | } | |
305 | printf("%d\t", data[i]); | |
306 | } | |
307 | printf("\n"); | |
308 | } | |
309 | ||
310 | ||
ebf7cafe | 311 | int AliAltroDecoder::SetMemory(UChar_t *dtaPtr, UInt_t size) |
31a920d3 | 312 | { |
ac672c4c | 313 | // Sets the pointer to the memory block that should be decoded |
314 | // Returns a negative value if an inconsistency in the data is detected | |
315 | ||
84111923 | 316 | if(dtaPtr == 0) |
317 | { | |
318 | printf("\nAliAltroDecoder::SetMemory(UChar_t *dtaPtr, UInt_t size) FATAL ERROR, dtaPtr = ZERO !!!!!!!!!!!!\n"); | |
49f90cc3 | 319 | printf("Please check your code that you don't give a zero pointer to the decoder \n"); |
84111923 | 320 | return -99; |
321 | } | |
322 | ||
49f90cc3 | 323 | if (size<fkN32HeaderWords+4) |
324 | { | |
325 | printf("\nAliAltroDecoder::SetMemory(UChar_t *dtaPtr, UInt_t size) FATAL ERROR, too little data (%d)\n", size); | |
326 | printf("Data buffer must contain the CDH and at least one 32bit RCU trailer word\n"); | |
327 | return -99; | |
328 | } | |
329 | ||
330 | ||
ebf7cafe | 331 | int iRet = 0; |
49f90cc3 | 332 | UInt_t tmpTrailerSize; |
31a920d3 | 333 | fIsDecoded = kFALSE; |
334 | f8DtaPtr =dtaPtr; | |
335 | fSize = size; | |
336 | f8DtaPtr =f8DtaPtr + fSize; | |
337 | f32DtaPtr = (UInt_t *)f8DtaPtr; | |
49f90cc3 | 338 | tmpTrailerSize = *(f32DtaPtr - 1); |
339 | ||
340 | // format of the trailer has been fixed in the RCU FW2 | |
341 | // Bit 31 to 16: 0xaaaa (16 bit) | |
342 | // Bit 15 to 7: RCU address ( 9 bit) | |
343 | // Bit 6 to 0: Trailer length ( 7 bit) | |
344 | // | |
345 | // RCU FW1 has one trailer word containing the number of | |
346 | // 10bit Altro words. According to some early documents, | |
347 | // it should have at least 2 32bit words: trailer length and | |
348 | // the number of 10bit Altro words. This is the format of | |
349 | // the simulation at time of writing (June 2008) | |
350 | bool haveFw2=false; | |
351 | if ((tmpTrailerSize>>16)==0xaaaa) { | |
352 | haveFw2=true; | |
353 | tmpTrailerSize = tmpTrailerSize&0x7f; // 7 LSBs of the last word | |
354 | } else | |
31a920d3 | 355 | if(tmpTrailerSize <= MAX_TRAILER_WORDS) |
356 | { | |
357 | tmpTrailerSize = tmpTrailerSize; //assume that the last word of the buffer gives the number of trailer words | |
358 | } | |
49f90cc3 | 359 | // nof 10bit AltroWords * 5/4 + bytes in the CDH + 4 bytes RCU trailer |
360 | else if (((*(f32DtaPtr-1)*5)/4 + fkN32HeaderWords*4 + 4)<=fSize) | |
31a920d3 | 361 | { |
362 | tmpTrailerSize = 1; //assume that last word is ONE, and that the this word gives the number of 40 bit altro words | |
363 | } | |
49f90cc3 | 364 | else |
365 | { | |
366 | tmpTrailerSize=0; | |
367 | fIsFatalCorruptedTrailer = kTRUE; | |
368 | iRet = -1; | |
369 | } | |
31a920d3 | 370 | |
49f90cc3 | 371 | if(tmpTrailerSize > 0 && (fkN32HeaderWords + tmpTrailerSize)*4<=fSize) |
ebf7cafe | 372 | { |
49f90cc3 | 373 | f8PayloadSize = fSize - (fkN32HeaderWords + tmpTrailerSize)*4; |
374 | fN40AltroWords = f8PayloadSize/5; | |
375 | fNDDLBlocks = fN40AltroWords/4; | |
376 | f32LastDDLBlockSize = ((f8PayloadSize%(4*DDL_32BLOCK_SIZE))+3)/4; | |
377 | ||
ebf7cafe | 378 | f32DtaPtr = f32DtaPtr - tmpTrailerSize; |
379 | fN40RcuAltroWords = *f32DtaPtr; | |
ac672c4c | 380 | f32DtaPtr = (UInt_t *)dtaPtr + fkN32HeaderWords; |
ebf7cafe | 381 | fIsFatalCorruptedTrailer = kFALSE; |
ebf7cafe | 382 | } |
817c796a | 383 | |
384 | // all subsequent consistency checks depend on the correct initialization | |
385 | // of the pointer and size variables | |
386 | assert(f8DtaPtr == dtaPtr + fSize); | |
ebf7cafe | 387 | return iRet; |
388 | ||
31a920d3 | 389 | } |
390 | ||
391 | ||
392 | void AliAltroDecoder::DecodeDDLBlock() | |
393 | { | |
ac672c4c | 394 | //Decode one 160 bit DDL block into 16 x 16 bit integers (only least significant 10 bits are filled) |
395 | ||
31a920d3 | 396 | fOutBuffer[fOutBufferIndex] = *f32DtaPtr & 0x3ff; //s0 |
397 | fOutBufferIndex ++; | |
398 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xffc00) >> 10; //s1 | |
399 | fOutBufferIndex ++; | |
400 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0x3ff00000) >> 20; //s2 | |
401 | fOutBufferIndex ++; | |
402 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xc0000000) >> 30; //s3_1 | |
403 | f32DtaPtr ++; | |
404 | fOutBuffer[fOutBufferIndex] = fOutBuffer[fOutBufferIndex] | ((*f32DtaPtr & 0xff) << 2); //s3_2 | |
405 | fOutBufferIndex ++; | |
406 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0x3ff00) >> 8; //s4 | |
407 | fOutBufferIndex ++; | |
408 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xffc0000) >> 18; //s5 | |
409 | fOutBufferIndex ++; | |
410 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xf0000000) >> 28; //s6_1 | |
411 | f32DtaPtr ++; | |
412 | fOutBuffer[fOutBufferIndex] = fOutBuffer[fOutBufferIndex] | ((*f32DtaPtr & 0x3f) << 4); //s6_2 | |
413 | fOutBufferIndex ++; | |
414 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xffc0) >> 6; //s7 | |
415 | fOutBufferIndex ++; | |
416 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0x3ff0000) >> 16; //s8 | |
417 | fOutBufferIndex ++; | |
418 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xFC000000) >> 26; //s9_1 | |
419 | f32DtaPtr ++; | |
420 | fOutBuffer[fOutBufferIndex] = fOutBuffer[fOutBufferIndex] | ((*f32DtaPtr & 0xf) << 6); //s9_2 | |
421 | fOutBufferIndex ++; | |
422 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0x3ff0) >> 4; //s10 | |
423 | fOutBufferIndex ++; | |
424 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xffc000) >> 14; //s11 | |
425 | fOutBufferIndex ++; | |
426 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xff000000) >> 24; //s12_1 | |
427 | f32DtaPtr ++; | |
428 | fOutBuffer[fOutBufferIndex] = fOutBuffer[fOutBufferIndex] | ((*f32DtaPtr & 0x3) << 8); //s12_2 | |
429 | fOutBufferIndex ++; | |
430 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xffc) >> 2; //s13 | |
431 | fOutBufferIndex ++; | |
432 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0x3ff000) >> 12; //s14 | |
433 | fOutBufferIndex ++; | |
434 | fOutBuffer[fOutBufferIndex] = (*f32DtaPtr & 0xffc00000) >> 22; //s15 | |
435 | f32DtaPtr ++; | |
436 | fOutBufferIndex ++; | |
437 | } | |
438 | ||
439 | ||
440 | void AliAltroDecoder::DecodeLastDDLBlock() | |
441 | { | |
ac672c4c | 442 | // Decode one 160 bit DDL block into 16 integers. |
443 | // In order to use the same decoding function (DecodeDDLBlock()) | |
444 | // a copy of the the last DDL block is made and | |
445 | // if the las block does not align with 160 bits then it is padded with zeroes | |
446 | ||
31a920d3 | 447 | for(Int_t i=0; i < f32LastDDLBlockSize; i++) |
448 | { | |
449 | fDDLBlockDummy[i] = *f32DtaPtr; | |
450 | f32DtaPtr ++; | |
451 | } | |
452 | ||
453 | f32DtaPtr = fDDLBlockDummy; | |
31a920d3 | 454 | DecodeDDLBlock(); |
86525f0f | 455 | f32DtaPtr=(UInt_t*)(f8DtaPtr-fSize+f8PayloadSize+fkN32HeaderWords*4); |
456 | } | |
457 | ||
458 | Int_t AliAltroDecoder::CopyBackward(Byte_t* pBuffer, Int_t bufferSize) | |
459 | { | |
460 | // Copy the original 10/40 bit encecoded data of the current channel. | |
461 | // The funtions copies the data to the end of the provided buffer. | |
462 | // @param pBuffer target buffer | |
463 | // @param bufferSize size of target buffer | |
464 | // @return number of copied bytes, neg. error code if failed | |
465 | Int_t iCopy=0; | |
466 | ||
467 | if(fIsDecoded != kTRUE) { | |
468 | AliWarning("buffer has not been decoded, no channel data available"); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | // This method does not need to be the fastest possible implementation | |
473 | // For the sake of stability, there are a lot of consistency checks. | |
474 | ||
475 | // the fOutBufferIndex always points to the next channel, since we are | |
476 | // reading backwards, this is one byte before the start of the current | |
477 | // channel. | |
478 | Int_t currentIndex=fOutBufferIndex+1; | |
479 | if (fNAltro10bitWords>0 && currentIndex < fN40AltroWords*4 ) { | |
480 | ||
481 | // calculate the position in the encoded data, beginning right | |
482 | // after the CDH. 10 -> 8 bit: needs 5/4 times the index | |
483 | Int_t position=(currentIndex*5)/4; | |
484 | if (position*4==currentIndex*5) { | |
485 | // no of 10 bit words is without the fill words to fill complete 40 bit words | |
486 | // in addition, align to complete 40 bit words (the '+3') | |
487 | iCopy=((fNAltro10bitWords+3)/4)*5; | |
488 | ||
489 | // calculate the source pointer in the encoded data | |
490 | // f8DtaPtr was set to the end of the whole data buffer | |
491 | // f32DtaPtr is behind the payload after decoding | |
492 | Byte_t* pSrc=f8DtaPtr-fSize+(fkN32HeaderWords*4)+position; | |
493 | if (pSrc+5<(Byte_t*)f32DtaPtr) { | |
494 | ||
495 | // check the first byte of the source buffer, has to be consistent | |
496 | // with the 8 LSBs of the decoded 10 bit word at the beginning of | |
497 | // the current channel | |
498 | //assert(*pSrc==fOutBuffer[currentIndex]&0xff); | |
499 | if (*pSrc==fOutBuffer[currentIndex]&0xff) { | |
500 | ||
501 | // try to verfify the length of the channel | |
ecc0795d | 502 | UInt_t lenCheck=*(pSrc+iCopy+2)|(*(pSrc+iCopy+3)&0x3)<<8; |
86525f0f | 503 | if (lenCheck==fNAltro10bitWords) { |
504 | ||
505 | // copy including the 40 bit altro trailer | |
506 | iCopy+=5; | |
507 | if (iCopy<=bufferSize) { | |
508 | ||
509 | // copy to the end of the buffer | |
510 | Byte_t* pTgt=pBuffer+bufferSize-iCopy; | |
511 | memcpy(pTgt, pSrc, iCopy); | |
512 | } else { | |
513 | AliError(Form("target buffer too small: available %d, required %d", bufferSize, iCopy)); | |
514 | iCopy=-1; | |
515 | } | |
516 | } else { | |
ecc0795d | 517 | AliWarning(Form("format error: can not reproduce channel length: expected %d, read %d", fNAltro10bitWords, lenCheck)); |
86525f0f | 518 | iCopy=-1; |
519 | } | |
520 | } else { | |
521 | AliError(Form("first byte of encoded data (%#x at %d) does not match decoded word (%#x at %d)", *pSrc, position, fOutBuffer[currentIndex]&0xff, currentIndex)); | |
522 | iCopy=-1; | |
523 | } | |
524 | } else { | |
525 | AliError(Form("buffer size missmatch: payload ends at %p, but current channel pretends to end at %p", f32DtaPtr, pSrc+5)); | |
526 | iCopy=-1; | |
527 | } | |
528 | } else { | |
529 | AliError(Form("current position does not match a byte: currentIndex=%d", currentIndex)); | |
530 | iCopy=-1; | |
531 | } | |
532 | } | |
533 | return iCopy; | |
534 | } | |
535 | ||
536 | Bool_t AliAltroDecoder::GetRCUTrailerData(UChar_t*& data) const | |
537 | { | |
538 | // Provide a pointer to RCU trailer. | |
539 | // The type of the parameter might not be optimal, but the function has | |
540 | // been chosen that way to be similar to the counterpart in | |
541 | // AliAltroRawStream. | |
542 | // @return kTRUE if trailer available; | |
543 | if (!f8DtaPtr) return kFALSE; | |
544 | data=f8DtaPtr-(fSize-(f8PayloadSize+fkN32HeaderWords*sizeof(UInt_t))); | |
545 | assert((UChar_t*)f32DtaPtr == data); | |
546 | return kTRUE; | |
547 | } | |
548 | ||
549 | Int_t AliAltroDecoder::GetRCUTrailerSize() const | |
550 | { | |
551 | // Provide size of RCU trailer. | |
552 | if (!f8DtaPtr) return 0; | |
553 | assert(fSize>(f8PayloadSize+fkN32HeaderWords*sizeof(UInt_t))); | |
554 | return fSize-(f8PayloadSize+fkN32HeaderWords*sizeof(UInt_t)); | |
31a920d3 | 555 | } |