Adding new calibration flavours for trigger
[u/mrichter/AliRoot.git] / RAW / AliTPCRawStream.cxx
CommitLineData
f8aae377 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
42d20574 16/* $Id$ */
17
f8aae377 18///////////////////////////////////////////////////////////////////////////////
bea6b2a4 19///
20/// This class provides access to TPC digits in raw data.
21///
22/// It loops over all TPC digits in the raw data given by the AliRawReader.
23/// The Next method goes to the next digit. If there are no digits left
24/// it returns kFALSE.
25/// Several getters provide information about the current digit.
26///
f8aae377 27///////////////////////////////////////////////////////////////////////////////
28
29#include "AliTPCRawStream.h"
bea6b2a4 30#include "AliTPCHNode.h"
42d20574 31#include "AliRawReader.h"
f8aae377 32
33ClassImp(AliTPCRawStream)
34
35
36AliTPCHNode** AliTPCRawStream::fgRootNode = NULL;
95e50ecd 37UInt_t** AliTPCRawStream::fgLUTDimension = NULL;
38AliTPCHNode***AliTPCRawStream::fgLUTNode = NULL;
f8aae377 39
40
41AliTPCRawStream::AliTPCRawStream(AliRawReader* rawReader)
42{
43// create an object to read TPC raw digits
44
45 fRawReader = rawReader;
46 fRawReader->Select(0);
42d20574 47 fData = new UShort_t[fgkDataMax];
f8aae377 48 fDataSize = fPosition = 0;
49 fCount = fBunchLength = 0;
50
51 if (!fgRootNode) {
42d20574 52 fgRootNode = new AliTPCHNode*[fgkNumTables];
95e50ecd 53 fgLUTDimension = new UInt_t*[fgkNumTables];
54 fgLUTNode = new AliTPCHNode**[fgkNumTables];
42d20574 55 fCompression.CreateTreesFromFile(fgRootNode, fgkNumTables);
95e50ecd 56 fCompression.CreateLUTsFromTrees(fgRootNode, fgkNumTables, fgLUTDimension, fgLUTNode);
f8aae377 57 }
58
59 fSector = fPrevSector = fRow = fPrevRow = fPad = fPrevPad = fTime = fSignal = -1;
60}
61
42d20574 62AliTPCRawStream::AliTPCRawStream(const AliTPCRawStream& stream) :
63 TObject(stream)
64{
65 Fatal("AliTPCRawStream", "copy constructor not implemented");
66}
67
68AliTPCRawStream& AliTPCRawStream::operator = (const AliTPCRawStream&
69 /* stream */)
70{
71 Fatal("operator =", "assignment operator not implemented");
72 return *this;
73}
74
f8aae377 75AliTPCRawStream::~AliTPCRawStream()
76{
77// clean up
78
79 delete[] fData;
80}
81
a8ffd46b 82void AliTPCRawStream::Reset()
83{
84// reset tpc raw stream params
85
86 fDataSize = fPosition = 0;
87 fCount = fBunchLength = 0;
88
89 fSector = fPrevSector = fRow = fPrevRow = fPad = fPrevPad = fTime = fSignal = -1;
90}
f8aae377 91
92Bool_t AliTPCRawStream::Next()
93{
94// read the next raw digit
95// returns kFALSE if there is no digit left
96
97 fPrevSector = fSector;
98 fPrevRow = fRow;
99 fPrevPad = fPad;
100
101 while (fCount == 0) { // next trailer
102 if (fPosition >= fDataSize) { // next payload
103 UChar_t* data;
104 do {
105 if (!fRawReader->ReadNextData(data)) return kFALSE;
106 } while (fRawReader->GetDataSize() == 0);
107
108 if (fRawReader->IsCompressed()) { // compressed data
0b3c7dfc 109 UInt_t size = 0;
95e50ecd 110 // fCompression.Decompress(fgRootNode, fgkNumTables,
111 // (char*) data, fRawReader->GetDataSize(),
112 // fData, size);
113 fCompression.DecompressWithLUTs(fgRootNode, fgLUTDimension, fgLUTNode, fgkNumTables,
114 (char*) data, fRawReader->GetDataSize(),
115 fData, size);
f8aae377 116 fDataSize = size;
117
118 } else { // uncompressed data
119 fDataSize = 0;
120 Int_t pos = (fRawReader->GetDataSize() * 8) / 10;
121 while (Get10BitWord(data, pos-1) == 0x2AA) pos--;
122 while (pos > 0) {
123 for (Int_t i = 0; i < 4; i++) { // copy trailer
124 fData[fDataSize++] = Get10BitWord(data, pos-4+i);
125 }
126 pos -= 4;
127 Int_t count = fData[fDataSize-4];
128 pos -= (4 - (count % 4)) % 4; // skip fill words
129
130 while (count > 0) {
131 UShort_t bunchLength = Get10BitWord(data, pos-1);
132 fData[fDataSize++] = bunchLength;
133 fData[fDataSize++] = Get10BitWord(data, pos-2); // time bin
134
135 // copy signal amplitudes in increasing order on time
136 for (Int_t i = 0; i < bunchLength-2; i++) {
137 fData[fDataSize++] = Get10BitWord(data, pos - bunchLength + i);
138 }
139 pos -= bunchLength;
140 count -= bunchLength;
141 }
142 }
143 }
144
145 fPosition = 0;
146 }
147 if (fPosition + 4 >= fDataSize) {
148 Error("Next", "could not read trailer");
149 return kFALSE;
150 }
151 fCount = fData[fPosition++];
152 fPad = fData[fPosition++];
153 fRow = fData[fPosition++];
154 fSector = fData[fPosition++];
155 fBunchLength = 0;
156 }
157
158 if (fBunchLength == 0) {
159 if (fPosition >= fDataSize) {
160 Error("Next", "could not read bunch length");
161 return kFALSE;
162 }
163 fBunchLength = fData[fPosition++] - 2;
164 fCount--;
165
166 if (fPosition >= fDataSize) {
167 Error("Next", "could not read time bin");
168 return kFALSE;
169 }
170 fTime = fData[fPosition++] - fBunchLength;
171 fCount--;
172 }
173
174 fTime++;
175 if (fPosition >= fDataSize) {
176 Error("Next", "could not read sample amplitude");
177 return kFALSE;
178 }
42d20574 179 fSignal = fData[fPosition++] + fgkOffset;
f8aae377 180 fCount--;
181 fBunchLength--;
182
183 return kTRUE;
184}
185
186
42d20574 187UShort_t AliTPCRawStream::Get10BitWord(UChar_t* buffer, Int_t position) const
f8aae377 188{
42d20574 189// return a word in a 10 bit array as an UShort_t
190
f8aae377 191 Int_t iBit = position * 10;
192 Int_t iByte = iBit / 8;
193 Int_t shift = iBit % 8;
194// return ((buffer[iByte+1] * 256 + buffer[iByte]) >> shift) & 0x03FF;
195
196 // recalculate the byte numbers and the shift because
197 // the raw data is written as integers where the high bits are filled first
198 // -> little endian is assumed here !
199 Int_t iByteHigh = 4 * (iByte / 4) + 3 - (iByte % 4);
200 iByte++;
201 Int_t iByteLow = 4 * (iByte / 4) + 3 - (iByte % 4);
202 shift = 6 - shift;
203 return ((buffer[iByteHigh] * 256 + buffer[iByteLow]) >> shift) & 0x03FF;
204}