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3ea47630 | 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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////////// | |
19 | /// | |
20 | /// This class provides access to Altro digits in raw data. | |
21 | /// | |
22 | /// It loops over all Altro 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 | /// | |
27 | /////////////////////////////////////////////////////////////////////////////// | |
28 | ||
29 | #include "AliAltroRawStream.h" | |
30 | #include "AliRawReader.h" | |
31 | ||
32 | ClassImp(AliAltroRawStream) | |
33 | ||
34 | ||
35 | //_____________________________________________________________________________ | |
36 | AliAltroRawStream::AliAltroRawStream(AliRawReader* rawReader) : | |
37 | fSector(-1), | |
38 | fPrevSector(-1), | |
39 | fRow(-1), | |
40 | fPrevRow(-1), | |
41 | fPad(-1), | |
42 | fPrevPad(-1), | |
43 | fTime(-1), | |
44 | fSignal(-1), | |
45 | fRawReader(rawReader), | |
46 | fData(NULL), | |
47 | fPosition(0), | |
48 | fCount(0), | |
49 | fBunchLength(0) | |
50 | { | |
51 | // create an object to read Altro raw digits | |
52 | ||
53 | } | |
54 | ||
55 | //_____________________________________________________________________________ | |
56 | AliAltroRawStream::AliAltroRawStream(const AliAltroRawStream& stream) : | |
57 | TObject(stream), | |
58 | fSector(-1), | |
59 | fPrevSector(-1), | |
60 | fRow(-1), | |
61 | fPrevRow(-1), | |
62 | fPad(-1), | |
63 | fPrevPad(-1), | |
64 | fTime(-1), | |
65 | fSignal(-1), | |
66 | fRawReader(NULL), | |
67 | fData(NULL), | |
68 | fPosition(0), | |
69 | fCount(0), | |
70 | fBunchLength(0) | |
71 | { | |
72 | Fatal("AliAltroRawStream", "copy constructor not implemented"); | |
73 | } | |
74 | ||
75 | //_____________________________________________________________________________ | |
76 | AliAltroRawStream& AliAltroRawStream::operator = (const AliAltroRawStream& | |
77 | /* stream */) | |
78 | { | |
79 | Fatal("operator =", "assignment operator not implemented"); | |
80 | return *this; | |
81 | } | |
82 | ||
83 | //_____________________________________________________________________________ | |
84 | AliAltroRawStream::~AliAltroRawStream() | |
85 | { | |
86 | // clean up | |
87 | ||
88 | } | |
89 | ||
90 | ||
91 | //_____________________________________________________________________________ | |
92 | Bool_t AliAltroRawStream::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 <= 0) { // next payload | |
103 | do { | |
104 | if (!fRawReader->ReadNextData(fData)) return kFALSE; | |
105 | } while (fRawReader->GetDataSize() == 0); | |
106 | ||
107 | fPosition = (fRawReader->GetDataSize() * 8) / 10; | |
108 | while (Get10BitWord(fData, fPosition-1) == 0x2AA) fPosition--; | |
109 | } | |
110 | ||
111 | if (fPosition > 0) { | |
112 | // read the trailer | |
113 | if (fPosition <= 4) { | |
114 | Error("Next", "could not read trailer"); | |
115 | return kFALSE; | |
116 | } | |
117 | fSector = Get10BitWord(fData, --fPosition); | |
118 | fRow = Get10BitWord(fData, --fPosition); | |
119 | fPad = Get10BitWord(fData, --fPosition); | |
120 | fCount = Get10BitWord(fData, --fPosition); | |
121 | ||
122 | fPosition -= (4 - (fCount % 4)) % 4; // skip fill words | |
123 | fBunchLength = 0; | |
124 | } | |
125 | } | |
126 | ||
127 | if (fBunchLength == 0) { | |
128 | if (fPosition <= 0) { | |
129 | Error("Next", "could not read bunch length"); | |
130 | return kFALSE; | |
131 | } | |
132 | fBunchLength = Get10BitWord(fData, --fPosition) - 2; | |
634692a1 | 133 | fTimeBunch = fBunchLength; |
3ea47630 | 134 | fCount--; |
135 | ||
136 | if (fPosition <= 0) { | |
137 | Error("Next", "could not read time bin"); | |
138 | return kFALSE; | |
139 | } | |
140 | fTime = Get10BitWord(fData, --fPosition); | |
141 | fCount--; | |
142 | } else { | |
143 | fTime--; | |
144 | } | |
145 | ||
146 | if (fPosition <= 0) { | |
147 | Error("Next", "could not read sample amplitude"); | |
148 | return kFALSE; | |
149 | } | |
150 | fSignal = Get10BitWord(fData, --fPosition); | |
151 | fCount--; | |
152 | fBunchLength--; | |
153 | ||
154 | return kTRUE; | |
155 | } | |
156 | ||
157 | ||
158 | //_____________________________________________________________________________ | |
159 | UShort_t AliAltroRawStream::Get10BitWord(UChar_t* buffer, Int_t position) const | |
160 | { | |
161 | // return a word in a 10 bit array as an UShort_t | |
162 | ||
163 | Int_t iBit = position * 10; | |
164 | Int_t iByte = iBit / 8; | |
165 | Int_t shift = iBit % 8; | |
166 | // return ((buffer[iByte+1] * 256 + buffer[iByte]) >> shift) & 0x03FF; | |
167 | ||
168 | // recalculate the byte numbers and the shift because | |
169 | // the raw data is written as integers where the high bits are filled first | |
170 | // -> little endian is assumed here ! | |
171 | Int_t iByteHigh = 4 * (iByte / 4) + 3 - (iByte % 4); | |
172 | iByte++; | |
173 | Int_t iByteLow = 4 * (iByte / 4) + 3 - (iByte % 4); | |
174 | shift = 6 - shift; | |
175 | return ((buffer[iByteHigh] * 256 + buffer[iByteLow]) >> shift) & 0x03FF; | |
176 | } |