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28a4c9c5 | 1 | /* |
b3f22de0 | 2 | * This file is part of the PulseView project. |
28a4c9c5 JH |
3 | * |
4 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
cef18fc6 | 21 | #include <extdef.h> |
28a4c9c5 | 22 | |
f556bc6a | 23 | #include <assert.h> |
4ceab49a | 24 | #include <string.h> |
b36d8550 | 25 | #include <stdlib.h> |
4ceab49a JH |
26 | #include <math.h> |
27 | ||
28 | #include <boost/foreach.hpp> | |
29 | ||
1b1ec774 | 30 | #include "logicsnapshot.h" |
f556bc6a | 31 | |
7d29656f | 32 | using namespace boost; |
2858b391 | 33 | using namespace std; |
28a4c9c5 | 34 | |
51e77110 | 35 | namespace pv { |
1b1ec774 | 36 | namespace data { |
51e77110 | 37 | |
1b1ec774 JH |
38 | const int LogicSnapshot::MipMapScalePower = 4; |
39 | const int LogicSnapshot::MipMapScaleFactor = 1 << MipMapScalePower; | |
40 | const float LogicSnapshot::LogMipMapScaleFactor = logf(MipMapScaleFactor); | |
41 | const uint64_t LogicSnapshot::MipMapDataUnit = 64*1024; // bytes | |
4ceab49a | 42 | |
1b1ec774 JH |
43 | LogicSnapshot::LogicSnapshot(const sr_datafeed_logic &logic) : |
44 | Snapshot(logic.unitsize), | |
4ceab49a | 45 | _last_append_sample(0) |
f556bc6a | 46 | { |
7d29656f | 47 | lock_guard<recursive_mutex> lock(_mutex); |
4ceab49a | 48 | memset(_mip_map, 0, sizeof(_mip_map)); |
f556bc6a JH |
49 | append_payload(logic); |
50 | } | |
51 | ||
1b1ec774 | 52 | LogicSnapshot::~LogicSnapshot() |
4ceab49a | 53 | { |
7d29656f | 54 | lock_guard<recursive_mutex> lock(_mutex); |
4ceab49a JH |
55 | BOOST_FOREACH(MipMapLevel &l, _mip_map) |
56 | free(l.data); | |
57 | } | |
58 | ||
1b1ec774 | 59 | void LogicSnapshot::append_payload( |
28a4c9c5 JH |
60 | const sr_datafeed_logic &logic) |
61 | { | |
f556bc6a | 62 | assert(_unit_size == logic.unitsize); |
5cef1ea3 | 63 | assert((logic.length % _unit_size) == 0); |
f556bc6a | 64 | |
7d29656f JH |
65 | lock_guard<recursive_mutex> lock(_mutex); |
66 | ||
5cef1ea3 | 67 | append_data(logic.data, logic.length / _unit_size); |
4ceab49a JH |
68 | |
69 | // Generate the first mip-map from the data | |
70 | append_payload_to_mipmap(); | |
71 | } | |
72 | ||
1b1ec774 | 73 | void LogicSnapshot::reallocate_mip_map(MipMapLevel &m) |
4ceab49a JH |
74 | { |
75 | const uint64_t new_data_length = ((m.length + MipMapDataUnit - 1) / | |
76 | MipMapDataUnit) * MipMapDataUnit; | |
333d5bbc | 77 | if (new_data_length > m.data_length) |
4ceab49a JH |
78 | { |
79 | m.data_length = new_data_length; | |
80 | m.data = realloc(m.data, new_data_length * _unit_size); | |
81 | } | |
82 | } | |
83 | ||
1b1ec774 | 84 | void LogicSnapshot::append_payload_to_mipmap() |
4ceab49a JH |
85 | { |
86 | MipMapLevel &m0 = _mip_map[0]; | |
87 | uint64_t prev_length; | |
88 | const uint8_t *src_ptr; | |
89 | uint8_t *dest_ptr; | |
90 | uint64_t accumulator; | |
91 | unsigned int diff_counter; | |
92 | ||
93 | // Expand the data buffer to fit the new samples | |
94 | prev_length = m0.length; | |
77bff0b1 | 95 | m0.length = _sample_count / MipMapScaleFactor; |
4ceab49a JH |
96 | |
97 | // Break off if there are no new samples to compute | |
333d5bbc | 98 | if (m0.length == prev_length) |
4ceab49a JH |
99 | return; |
100 | ||
101 | reallocate_mip_map(m0); | |
102 | ||
103 | dest_ptr = (uint8_t*)m0.data + prev_length * _unit_size; | |
104 | ||
105 | // Iterate through the samples to populate the first level mipmap | |
106 | accumulator = 0; | |
107 | diff_counter = MipMapScaleFactor; | |
108 | const uint8_t *end_src_ptr = (uint8_t*)_data + | |
109 | m0.length * _unit_size * MipMapScaleFactor; | |
333d5bbc | 110 | for (src_ptr = (uint8_t*)_data + |
4ceab49a JH |
111 | prev_length * _unit_size * MipMapScaleFactor; |
112 | src_ptr < end_src_ptr;) | |
113 | { | |
114 | // Accumulate transitions which have occurred in this sample | |
115 | accumulator = 0; | |
116 | diff_counter = MipMapScaleFactor; | |
333d5bbc | 117 | while (diff_counter-- > 0) |
4ceab49a JH |
118 | { |
119 | const uint64_t sample = *(uint64_t*)src_ptr; | |
120 | accumulator |= _last_append_sample ^ sample; | |
121 | _last_append_sample = sample; | |
122 | src_ptr += _unit_size; | |
123 | } | |
124 | ||
125 | *(uint64_t*)dest_ptr = accumulator; | |
126 | dest_ptr += _unit_size; | |
127 | } | |
128 | ||
129 | // Compute higher level mipmaps | |
333d5bbc | 130 | for (unsigned int level = 1; level < ScaleStepCount; level++) |
4ceab49a JH |
131 | { |
132 | MipMapLevel &m = _mip_map[level]; | |
133 | const MipMapLevel &ml = _mip_map[level-1]; | |
134 | ||
135 | // Expand the data buffer to fit the new samples | |
136 | prev_length = m.length; | |
137 | m.length = ml.length / MipMapScaleFactor; | |
138 | ||
139 | // Break off if there are no more samples to computed | |
333d5bbc | 140 | if (m.length == prev_length) |
4ceab49a JH |
141 | break; |
142 | ||
143 | reallocate_mip_map(m); | |
144 | ||
145 | // Subsample the level lower level | |
146 | src_ptr = (uint8_t*)ml.data + | |
147 | _unit_size * prev_length * MipMapScaleFactor; | |
148 | const uint8_t *end_dest_ptr = | |
149 | (uint8_t*)m.data + _unit_size * m.length; | |
333d5bbc | 150 | for (dest_ptr = (uint8_t*)m.data + |
4ceab49a JH |
151 | _unit_size * prev_length; |
152 | dest_ptr < end_dest_ptr; | |
153 | dest_ptr += _unit_size) | |
154 | { | |
155 | accumulator = 0; | |
156 | diff_counter = MipMapScaleFactor; | |
333d5bbc | 157 | while (diff_counter-- > 0) |
4ceab49a JH |
158 | { |
159 | accumulator |= *(uint64_t*)src_ptr; | |
160 | src_ptr += _unit_size; | |
161 | } | |
162 | ||
163 | *(uint64_t*)dest_ptr = accumulator; | |
164 | } | |
165 | } | |
28a4c9c5 | 166 | } |
2858b391 | 167 | |
1b1ec774 | 168 | uint64_t LogicSnapshot::get_sample(uint64_t index) const |
2858b391 JH |
169 | { |
170 | assert(_data); | |
3f96c34a | 171 | assert(index < _sample_count); |
2858b391 JH |
172 | |
173 | return *(uint64_t*)((uint8_t*)_data + index * _unit_size); | |
174 | } | |
175 | ||
1b1ec774 | 176 | void LogicSnapshot::get_subsampled_edges( |
2858b391 | 177 | std::vector<EdgePair> &edges, |
60b0c2da | 178 | uint64_t start, uint64_t end, |
0b02e057 | 179 | float min_length, int sig_index) |
2858b391 | 180 | { |
60b0c2da JH |
181 | uint64_t index = start; |
182 | unsigned int level; | |
7d0d64f9 JH |
183 | bool last_sample; |
184 | bool fast_forward; | |
0b02e057 | 185 | |
0b02e057 | 186 | assert(end <= get_sample_count()); |
2858b391 | 187 | assert(start <= end); |
0b02e057 | 188 | assert(min_length > 0); |
2858b391 JH |
189 | assert(sig_index >= 0); |
190 | assert(sig_index < SR_MAX_NUM_PROBES); | |
191 | ||
7d29656f JH |
192 | lock_guard<recursive_mutex> lock(_mutex); |
193 | ||
60b0c2da JH |
194 | const uint64_t block_length = (uint64_t)max(min_length, 1.0f); |
195 | const unsigned int min_level = max((int)floorf(logf(min_length) / | |
0b02e057 | 196 | LogMipMapScaleFactor) - 1, 0); |
7d0d64f9 | 197 | const uint64_t sig_mask = 1ULL << sig_index; |
2858b391 | 198 | |
7d0d64f9 JH |
199 | // Store the initial state |
200 | last_sample = (get_sample(start) & sig_mask) != 0; | |
201 | edges.push_back(pair<int64_t, bool>(index++, last_sample)); | |
2858b391 | 202 | |
333d5bbc | 203 | while (index + block_length <= end) |
2858b391 | 204 | { |
7d0d64f9 | 205 | //----- Continue to search -----// |
0b02e057 | 206 | level = min_level; |
7d0d64f9 | 207 | fast_forward = true; |
2858b391 | 208 | |
333d5bbc | 209 | if (min_length < MipMapScaleFactor) |
0b02e057 JH |
210 | { |
211 | // Search individual samples up to the beginning of | |
212 | // the next first level mip map block | |
7d0d64f9 | 213 | const uint64_t final_index = min(end, |
0b02e057 JH |
214 | pow2_ceil(index, MipMapScalePower)); |
215 | ||
333d5bbc | 216 | for (; index < final_index && |
0b02e057 JH |
217 | (index & ~(~0 << MipMapScalePower)) != 0; |
218 | index++) | |
219 | { | |
220 | const bool sample = | |
221 | (get_sample(index) & sig_mask) != 0; | |
7d0d64f9 JH |
222 | |
223 | // If there was a change we cannot fast forward | |
333d5bbc | 224 | if (sample != last_sample) { |
7d0d64f9 | 225 | fast_forward = false; |
0b02e057 | 226 | break; |
7d0d64f9 | 227 | } |
0b02e057 JH |
228 | } |
229 | } | |
230 | else | |
231 | { | |
232 | // If resolution is less than a mip map block, | |
233 | // round up to the beginning of the mip-map block | |
234 | // for this level of detail | |
235 | const int min_level_scale_power = | |
236 | (level + 1) * MipMapScalePower; | |
237 | index = pow2_ceil(index, min_level_scale_power); | |
333d5bbc | 238 | if (index >= end) |
0b02e057 JH |
239 | break; |
240 | ||
7d0d64f9 JH |
241 | // We can fast forward only if there was no change |
242 | const bool sample = | |
243 | (get_sample(index) & sig_mask) != 0; | |
244 | fast_forward = last_sample == sample; | |
0b02e057 JH |
245 | } |
246 | ||
333d5bbc | 247 | if (fast_forward) { |
7d0d64f9 JH |
248 | |
249 | // Fast forward: This involves zooming out to higher | |
250 | // levels of the mip map searching for changes, then | |
251 | // zooming in on them to find the point where the edge | |
252 | // begins. | |
253 | ||
254 | // Slide right and zoom out at the beginnings of mip-map | |
255 | // blocks until we encounter a change | |
333d5bbc | 256 | while (1) { |
7d0d64f9 JH |
257 | const int level_scale_power = |
258 | (level + 1) * MipMapScalePower; | |
259 | const uint64_t offset = | |
260 | index >> level_scale_power; | |
7d0d64f9 JH |
261 | |
262 | // Check if we reached the last block at this | |
263 | // level, or if there was a change in this block | |
333d5bbc | 264 | if (offset >= _mip_map[level].length || |
7d0d64f9 JH |
265 | (get_subsample(level, offset) & |
266 | sig_mask)) | |
0b02e057 JH |
267 | break; |
268 | ||
333d5bbc | 269 | if ((offset & ~(~0 << MipMapScalePower)) == 0) { |
7d0d64f9 JH |
270 | // If we are now at the beginning of a |
271 | // higher level mip-map block ascend one | |
272 | // level | |
333d5bbc | 273 | if (level + 1 >= ScaleStepCount || |
7d0d64f9 JH |
274 | !_mip_map[level + 1].data) |
275 | break; | |
276 | ||
277 | level++; | |
278 | } else { | |
279 | // Slide right to the beginning of the | |
280 | // next mip map block | |
281 | index = pow2_ceil(index + 1, | |
282 | level_scale_power); | |
283 | } | |
0b02e057 | 284 | } |
7d0d64f9 JH |
285 | |
286 | // Zoom in, and slide right until we encounter a change, | |
287 | // and repeat until we reach min_level | |
333d5bbc | 288 | while (1) { |
7d0d64f9 JH |
289 | assert(_mip_map[level].data); |
290 | ||
291 | const int level_scale_power = | |
292 | (level + 1) * MipMapScalePower; | |
293 | const uint64_t offset = | |
294 | index >> level_scale_power; | |
7d0d64f9 JH |
295 | |
296 | // Check if we reached the last block at this | |
297 | // level, or if there was a change in this block | |
333d5bbc | 298 | if (offset >= _mip_map[level].length || |
7d0d64f9 JH |
299 | (get_subsample(level, offset) & |
300 | sig_mask)) { | |
301 | // Zoom in unless we reached the minimum | |
302 | // zoom | |
333d5bbc | 303 | if (level == min_level) |
7d0d64f9 JH |
304 | break; |
305 | ||
306 | level--; | |
307 | } else { | |
308 | // Slide right to the beginning of the | |
309 | // next mip map block | |
310 | index = pow2_ceil(index + 1, | |
311 | level_scale_power); | |
312 | } | |
0b02e057 | 313 | } |
0b02e057 | 314 | |
7d0d64f9 JH |
315 | // If individual samples within the limit of resolution, |
316 | // do a linear search for the next transition within the | |
317 | // block | |
333d5bbc UH |
318 | if (min_length < MipMapScaleFactor) { |
319 | for (; index < end; index++) { | |
7d0d64f9 JH |
320 | const bool sample = (get_sample(index) & |
321 | sig_mask) != 0; | |
333d5bbc | 322 | if (sample != last_sample) |
7d0d64f9 JH |
323 | break; |
324 | } | |
0b02e057 JH |
325 | } |
326 | } | |
327 | ||
7d0d64f9 JH |
328 | //----- Store the edge -----// |
329 | ||
330 | // Take the last sample of the quanization block | |
331 | const int64_t final_index = index + block_length; | |
333d5bbc | 332 | if (index + block_length > end) |
7d0d64f9 JH |
333 | break; |
334 | ||
335 | // Store the final state | |
336 | const bool final_sample = | |
337 | (get_sample(final_index - 1) & sig_mask) != 0; | |
338 | edges.push_back(pair<int64_t, bool>(index, final_sample)); | |
339 | ||
340 | index = final_index; | |
341 | last_sample = final_sample; | |
2858b391 JH |
342 | } |
343 | ||
344 | // Add the final state | |
652010ea JH |
345 | edges.push_back(pair<int64_t, bool>(end, |
346 | get_sample(end) & sig_mask)); | |
2858b391 | 347 | } |
0b02e057 | 348 | |
1b1ec774 | 349 | uint64_t LogicSnapshot::get_subsample(int level, uint64_t offset) const |
b2bcbe51 JH |
350 | { |
351 | assert(level >= 0); | |
352 | assert(_mip_map[level].data); | |
353 | return *(uint64_t*)((uint8_t*)_mip_map[level].data + | |
354 | _unit_size * offset); | |
355 | } | |
356 | ||
1b1ec774 | 357 | uint64_t LogicSnapshot::pow2_ceil(uint64_t x, unsigned int power) |
0b02e057 | 358 | { |
60b0c2da JH |
359 | const uint64_t p = 1 << power; |
360 | return (x + p - 1) / p * p; | |
0b02e057 | 361 | } |
51e77110 | 362 | |
1b1ec774 | 363 | } // namespace data |
51e77110 | 364 | } // namespace pv |