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Commit | Line | Data |
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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 | |
819f4c25 JH |
32 | using boost::lock_guard; |
33 | using boost::recursive_mutex; | |
34 | using std::max; | |
35 | using std::min; | |
36 | using std::pair; | |
28a4c9c5 | 37 | |
51e77110 | 38 | namespace pv { |
1b1ec774 | 39 | namespace data { |
51e77110 | 40 | |
1b1ec774 JH |
41 | const int LogicSnapshot::MipMapScalePower = 4; |
42 | const int LogicSnapshot::MipMapScaleFactor = 1 << MipMapScalePower; | |
43 | const float LogicSnapshot::LogMipMapScaleFactor = logf(MipMapScaleFactor); | |
44 | const uint64_t LogicSnapshot::MipMapDataUnit = 64*1024; // bytes | |
4ceab49a | 45 | |
27d7c96b DK |
46 | LogicSnapshot::LogicSnapshot(const sr_datafeed_logic &logic, |
47 | const uint64_t expected_num_samples) : | |
1b1ec774 | 48 | Snapshot(logic.unitsize), |
4ceab49a | 49 | _last_append_sample(0) |
f556bc6a | 50 | { |
27d7c96b DK |
51 | set_capacity(expected_num_samples); |
52 | ||
7d29656f | 53 | lock_guard<recursive_mutex> lock(_mutex); |
4ceab49a | 54 | memset(_mip_map, 0, sizeof(_mip_map)); |
f556bc6a JH |
55 | append_payload(logic); |
56 | } | |
57 | ||
1b1ec774 | 58 | LogicSnapshot::~LogicSnapshot() |
4ceab49a | 59 | { |
7d29656f | 60 | lock_guard<recursive_mutex> lock(_mutex); |
4ceab49a JH |
61 | BOOST_FOREACH(MipMapLevel &l, _mip_map) |
62 | free(l.data); | |
63 | } | |
64 | ||
1b1ec774 | 65 | void LogicSnapshot::append_payload( |
28a4c9c5 JH |
66 | const sr_datafeed_logic &logic) |
67 | { | |
f556bc6a | 68 | assert(_unit_size == logic.unitsize); |
5cef1ea3 | 69 | assert((logic.length % _unit_size) == 0); |
f556bc6a | 70 | |
7d29656f JH |
71 | lock_guard<recursive_mutex> lock(_mutex); |
72 | ||
5cef1ea3 | 73 | append_data(logic.data, logic.length / _unit_size); |
4ceab49a JH |
74 | |
75 | // Generate the first mip-map from the data | |
76 | append_payload_to_mipmap(); | |
77 | } | |
78 | ||
ed990f11 JH |
79 | void LogicSnapshot::get_samples(uint8_t *const data, |
80 | int64_t start_sample, int64_t end_sample) const | |
81 | { | |
82 | assert(data); | |
83 | assert(start_sample >= 0); | |
0fbda3c2 | 84 | assert(start_sample <= (int64_t)_sample_count); |
ed990f11 | 85 | assert(end_sample >= 0); |
0fbda3c2 | 86 | assert(end_sample <= (int64_t)_sample_count); |
ed990f11 JH |
87 | assert(start_sample <= end_sample); |
88 | ||
89 | lock_guard<recursive_mutex> lock(_mutex); | |
90 | ||
91 | const size_t size = (end_sample - start_sample) * _unit_size; | |
92 | memcpy(data, (const uint8_t*)_data + start_sample, size); | |
93 | } | |
94 | ||
023887ca | 95 | void LogicSnapshot::reallocate_mipmap_level(MipMapLevel &m) |
4ceab49a JH |
96 | { |
97 | const uint64_t new_data_length = ((m.length + MipMapDataUnit - 1) / | |
98 | MipMapDataUnit) * MipMapDataUnit; | |
333d5bbc | 99 | if (new_data_length > m.data_length) |
4ceab49a JH |
100 | { |
101 | m.data_length = new_data_length; | |
8fe60279 JH |
102 | |
103 | // Padding is added to allow for the uint64_t write word | |
104 | m.data = realloc(m.data, new_data_length * _unit_size + | |
105 | sizeof(uint64_t)); | |
4ceab49a JH |
106 | } |
107 | } | |
108 | ||
1b1ec774 | 109 | void LogicSnapshot::append_payload_to_mipmap() |
4ceab49a JH |
110 | { |
111 | MipMapLevel &m0 = _mip_map[0]; | |
112 | uint64_t prev_length; | |
113 | const uint8_t *src_ptr; | |
114 | uint8_t *dest_ptr; | |
115 | uint64_t accumulator; | |
116 | unsigned int diff_counter; | |
117 | ||
118 | // Expand the data buffer to fit the new samples | |
119 | prev_length = m0.length; | |
77bff0b1 | 120 | m0.length = _sample_count / MipMapScaleFactor; |
4ceab49a JH |
121 | |
122 | // Break off if there are no new samples to compute | |
333d5bbc | 123 | if (m0.length == prev_length) |
4ceab49a JH |
124 | return; |
125 | ||
023887ca | 126 | reallocate_mipmap_level(m0); |
4ceab49a JH |
127 | |
128 | dest_ptr = (uint8_t*)m0.data + prev_length * _unit_size; | |
129 | ||
130 | // Iterate through the samples to populate the first level mipmap | |
023887ca | 131 | const uint8_t *const end_src_ptr = (uint8_t*)_data + |
4ceab49a | 132 | m0.length * _unit_size * MipMapScaleFactor; |
333d5bbc | 133 | for (src_ptr = (uint8_t*)_data + |
4ceab49a JH |
134 | prev_length * _unit_size * MipMapScaleFactor; |
135 | src_ptr < end_src_ptr;) | |
136 | { | |
137 | // Accumulate transitions which have occurred in this sample | |
138 | accumulator = 0; | |
139 | diff_counter = MipMapScaleFactor; | |
333d5bbc | 140 | while (diff_counter-- > 0) |
4ceab49a JH |
141 | { |
142 | const uint64_t sample = *(uint64_t*)src_ptr; | |
143 | accumulator |= _last_append_sample ^ sample; | |
144 | _last_append_sample = sample; | |
145 | src_ptr += _unit_size; | |
146 | } | |
147 | ||
148 | *(uint64_t*)dest_ptr = accumulator; | |
149 | dest_ptr += _unit_size; | |
150 | } | |
151 | ||
152 | // Compute higher level mipmaps | |
333d5bbc | 153 | for (unsigned int level = 1; level < ScaleStepCount; level++) |
4ceab49a JH |
154 | { |
155 | MipMapLevel &m = _mip_map[level]; | |
156 | const MipMapLevel &ml = _mip_map[level-1]; | |
157 | ||
158 | // Expand the data buffer to fit the new samples | |
159 | prev_length = m.length; | |
160 | m.length = ml.length / MipMapScaleFactor; | |
161 | ||
162 | // Break off if there are no more samples to computed | |
333d5bbc | 163 | if (m.length == prev_length) |
4ceab49a JH |
164 | break; |
165 | ||
023887ca | 166 | reallocate_mipmap_level(m); |
4ceab49a JH |
167 | |
168 | // Subsample the level lower level | |
169 | src_ptr = (uint8_t*)ml.data + | |
170 | _unit_size * prev_length * MipMapScaleFactor; | |
023887ca | 171 | const uint8_t *const end_dest_ptr = |
4ceab49a | 172 | (uint8_t*)m.data + _unit_size * m.length; |
333d5bbc | 173 | for (dest_ptr = (uint8_t*)m.data + |
4ceab49a JH |
174 | _unit_size * prev_length; |
175 | dest_ptr < end_dest_ptr; | |
176 | dest_ptr += _unit_size) | |
177 | { | |
178 | accumulator = 0; | |
179 | diff_counter = MipMapScaleFactor; | |
333d5bbc | 180 | while (diff_counter-- > 0) |
4ceab49a JH |
181 | { |
182 | accumulator |= *(uint64_t*)src_ptr; | |
183 | src_ptr += _unit_size; | |
184 | } | |
185 | ||
186 | *(uint64_t*)dest_ptr = accumulator; | |
187 | } | |
188 | } | |
28a4c9c5 | 189 | } |
2858b391 | 190 | |
1b1ec774 | 191 | uint64_t LogicSnapshot::get_sample(uint64_t index) const |
2858b391 JH |
192 | { |
193 | assert(_data); | |
3f96c34a | 194 | assert(index < _sample_count); |
2858b391 JH |
195 | |
196 | return *(uint64_t*)((uint8_t*)_data + index * _unit_size); | |
197 | } | |
198 | ||
1b1ec774 | 199 | void LogicSnapshot::get_subsampled_edges( |
2858b391 | 200 | std::vector<EdgePair> &edges, |
60b0c2da | 201 | uint64_t start, uint64_t end, |
0b02e057 | 202 | float min_length, int sig_index) |
2858b391 | 203 | { |
60b0c2da JH |
204 | uint64_t index = start; |
205 | unsigned int level; | |
7d0d64f9 JH |
206 | bool last_sample; |
207 | bool fast_forward; | |
0b02e057 | 208 | |
0b02e057 | 209 | assert(end <= get_sample_count()); |
2858b391 | 210 | assert(start <= end); |
0b02e057 | 211 | assert(min_length > 0); |
2858b391 | 212 | assert(sig_index >= 0); |
80d50141 | 213 | assert(sig_index < 64); |
2858b391 | 214 | |
7d29656f JH |
215 | lock_guard<recursive_mutex> lock(_mutex); |
216 | ||
60b0c2da JH |
217 | const uint64_t block_length = (uint64_t)max(min_length, 1.0f); |
218 | const unsigned int min_level = max((int)floorf(logf(min_length) / | |
0b02e057 | 219 | LogMipMapScaleFactor) - 1, 0); |
7d0d64f9 | 220 | const uint64_t sig_mask = 1ULL << sig_index; |
2858b391 | 221 | |
7d0d64f9 JH |
222 | // Store the initial state |
223 | last_sample = (get_sample(start) & sig_mask) != 0; | |
224 | edges.push_back(pair<int64_t, bool>(index++, last_sample)); | |
2858b391 | 225 | |
333d5bbc | 226 | while (index + block_length <= end) |
2858b391 | 227 | { |
7d0d64f9 | 228 | //----- Continue to search -----// |
0b02e057 | 229 | level = min_level; |
f06ab143 JH |
230 | |
231 | // We cannot fast-forward if there is no mip-map data at | |
232 | // at the minimum level. | |
233 | fast_forward = (_mip_map[level].data != NULL); | |
2858b391 | 234 | |
333d5bbc | 235 | if (min_length < MipMapScaleFactor) |
0b02e057 JH |
236 | { |
237 | // Search individual samples up to the beginning of | |
238 | // the next first level mip map block | |
7d0d64f9 | 239 | const uint64_t final_index = min(end, |
0b02e057 JH |
240 | pow2_ceil(index, MipMapScalePower)); |
241 | ||
333d5bbc | 242 | for (; index < final_index && |
0b02e057 JH |
243 | (index & ~(~0 << MipMapScalePower)) != 0; |
244 | index++) | |
245 | { | |
246 | const bool sample = | |
247 | (get_sample(index) & sig_mask) != 0; | |
7d0d64f9 JH |
248 | |
249 | // If there was a change we cannot fast forward | |
333d5bbc | 250 | if (sample != last_sample) { |
7d0d64f9 | 251 | fast_forward = false; |
0b02e057 | 252 | break; |
7d0d64f9 | 253 | } |
0b02e057 JH |
254 | } |
255 | } | |
256 | else | |
257 | { | |
258 | // If resolution is less than a mip map block, | |
259 | // round up to the beginning of the mip-map block | |
260 | // for this level of detail | |
261 | const int min_level_scale_power = | |
262 | (level + 1) * MipMapScalePower; | |
263 | index = pow2_ceil(index, min_level_scale_power); | |
333d5bbc | 264 | if (index >= end) |
0b02e057 JH |
265 | break; |
266 | ||
7d0d64f9 JH |
267 | // We can fast forward only if there was no change |
268 | const bool sample = | |
269 | (get_sample(index) & sig_mask) != 0; | |
f06ab143 JH |
270 | if (last_sample != sample) |
271 | fast_forward = false; | |
0b02e057 JH |
272 | } |
273 | ||
333d5bbc | 274 | if (fast_forward) { |
7d0d64f9 JH |
275 | |
276 | // Fast forward: This involves zooming out to higher | |
277 | // levels of the mip map searching for changes, then | |
278 | // zooming in on them to find the point where the edge | |
279 | // begins. | |
280 | ||
281 | // Slide right and zoom out at the beginnings of mip-map | |
282 | // blocks until we encounter a change | |
333d5bbc | 283 | while (1) { |
7d0d64f9 JH |
284 | const int level_scale_power = |
285 | (level + 1) * MipMapScalePower; | |
286 | const uint64_t offset = | |
287 | index >> level_scale_power; | |
7d0d64f9 JH |
288 | |
289 | // Check if we reached the last block at this | |
290 | // level, or if there was a change in this block | |
333d5bbc | 291 | if (offset >= _mip_map[level].length || |
7d0d64f9 JH |
292 | (get_subsample(level, offset) & |
293 | sig_mask)) | |
0b02e057 JH |
294 | break; |
295 | ||
333d5bbc | 296 | if ((offset & ~(~0 << MipMapScalePower)) == 0) { |
7d0d64f9 JH |
297 | // If we are now at the beginning of a |
298 | // higher level mip-map block ascend one | |
299 | // level | |
333d5bbc | 300 | if (level + 1 >= ScaleStepCount || |
7d0d64f9 JH |
301 | !_mip_map[level + 1].data) |
302 | break; | |
303 | ||
304 | level++; | |
305 | } else { | |
306 | // Slide right to the beginning of the | |
307 | // next mip map block | |
308 | index = pow2_ceil(index + 1, | |
309 | level_scale_power); | |
310 | } | |
0b02e057 | 311 | } |
7d0d64f9 JH |
312 | |
313 | // Zoom in, and slide right until we encounter a change, | |
314 | // and repeat until we reach min_level | |
333d5bbc | 315 | while (1) { |
7d0d64f9 JH |
316 | assert(_mip_map[level].data); |
317 | ||
318 | const int level_scale_power = | |
319 | (level + 1) * MipMapScalePower; | |
320 | const uint64_t offset = | |
321 | index >> level_scale_power; | |
7d0d64f9 JH |
322 | |
323 | // Check if we reached the last block at this | |
324 | // level, or if there was a change in this block | |
333d5bbc | 325 | if (offset >= _mip_map[level].length || |
7d0d64f9 JH |
326 | (get_subsample(level, offset) & |
327 | sig_mask)) { | |
328 | // Zoom in unless we reached the minimum | |
329 | // zoom | |
333d5bbc | 330 | if (level == min_level) |
7d0d64f9 JH |
331 | break; |
332 | ||
333 | level--; | |
334 | } else { | |
335 | // Slide right to the beginning of the | |
336 | // next mip map block | |
337 | index = pow2_ceil(index + 1, | |
338 | level_scale_power); | |
339 | } | |
0b02e057 | 340 | } |
0b02e057 | 341 | |
7d0d64f9 JH |
342 | // If individual samples within the limit of resolution, |
343 | // do a linear search for the next transition within the | |
344 | // block | |
333d5bbc UH |
345 | if (min_length < MipMapScaleFactor) { |
346 | for (; index < end; index++) { | |
7d0d64f9 JH |
347 | const bool sample = (get_sample(index) & |
348 | sig_mask) != 0; | |
333d5bbc | 349 | if (sample != last_sample) |
7d0d64f9 JH |
350 | break; |
351 | } | |
0b02e057 JH |
352 | } |
353 | } | |
354 | ||
7d0d64f9 JH |
355 | //----- Store the edge -----// |
356 | ||
357 | // Take the last sample of the quanization block | |
358 | const int64_t final_index = index + block_length; | |
333d5bbc | 359 | if (index + block_length > end) |
7d0d64f9 JH |
360 | break; |
361 | ||
362 | // Store the final state | |
363 | const bool final_sample = | |
364 | (get_sample(final_index - 1) & sig_mask) != 0; | |
365 | edges.push_back(pair<int64_t, bool>(index, final_sample)); | |
366 | ||
367 | index = final_index; | |
368 | last_sample = final_sample; | |
2858b391 JH |
369 | } |
370 | ||
371 | // Add the final state | |
175d6573 JH |
372 | const bool end_sample = get_sample(end) & sig_mask; |
373 | if (last_sample != end_sample) | |
374 | edges.push_back(pair<int64_t, bool>(end, end_sample)); | |
375 | edges.push_back(pair<int64_t, bool>(end + 1, end_sample)); | |
2858b391 | 376 | } |
0b02e057 | 377 | |
1b1ec774 | 378 | uint64_t LogicSnapshot::get_subsample(int level, uint64_t offset) const |
b2bcbe51 JH |
379 | { |
380 | assert(level >= 0); | |
381 | assert(_mip_map[level].data); | |
382 | return *(uint64_t*)((uint8_t*)_mip_map[level].data + | |
383 | _unit_size * offset); | |
384 | } | |
385 | ||
1b1ec774 | 386 | uint64_t LogicSnapshot::pow2_ceil(uint64_t x, unsigned int power) |
0b02e057 | 387 | { |
60b0c2da JH |
388 | const uint64_t p = 1 << power; |
389 | return (x + p - 1) / p * p; | |
0b02e057 | 390 | } |
51e77110 | 391 | |
1b1ec774 | 392 | } // namespace data |
51e77110 | 393 | } // namespace pv |