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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2013 Bert Vermeulen <bert@biot.com> | |
6 | * Copyright (C) 2017-2020 Gerhard Sittig <gerhard.sittig@gmx.net> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | /* | |
23 | * TODO | |
24 | * - Check the mixed signal queue for completeness and correctness. | |
25 | * - Tune the analog "immediate write" code path for throughput. | |
26 | * - Remove excess diagnostics when the implementation is considered | |
27 | * feature complete and reliable. | |
28 | */ | |
29 | ||
30 | #include <config.h> | |
31 | ||
32 | #include <ctype.h> | |
33 | #include <glib.h> | |
34 | #include <stdlib.h> | |
35 | #include <string.h> | |
36 | ||
37 | #include <libsigrok/libsigrok.h> | |
38 | #include "libsigrok-internal.h" | |
39 | ||
40 | #define LOG_PREFIX "output/vcd" | |
41 | ||
42 | static const int with_queue_stats = 0; | |
43 | static const int with_pool_stats = 0; | |
44 | ||
45 | struct vcd_channel_desc { | |
46 | size_t index; | |
47 | GString *name; | |
48 | enum sr_channeltype type; | |
49 | struct { | |
50 | uint8_t logic; | |
51 | double real; | |
52 | } last; | |
53 | uint64_t last_rcvd_snum; | |
54 | }; | |
55 | ||
56 | /** Queued values for a given sample number. */ | |
57 | struct vcd_queue_item { | |
58 | uint64_t samplenum; /**!< sample number, _not_ timestamp */ | |
59 | GString *values; /**!< text of value changes */ | |
60 | }; | |
61 | ||
62 | struct context { | |
63 | size_t enabled_count; | |
64 | size_t logic_count; | |
65 | size_t analog_count; | |
66 | gboolean header_done; | |
67 | uint64_t period; | |
68 | struct vcd_channel_desc *channels; | |
69 | uint64_t samplerate; | |
70 | GSList *free_list, *used_list; | |
71 | size_t alloced, freed, reused, pooled; | |
72 | GList *vcd_queue_list; | |
73 | GList *vcd_queue_last; | |
74 | gboolean immediate_write; | |
75 | uint8_t *last_logic; | |
76 | }; | |
77 | ||
78 | /* | |
79 | * Construct VCD signal identifiers from a sigrok channel index. The | |
80 | * routine returns a GString which the caller is supposed to release. | |
81 | * | |
82 | * There are 94 printable ASCII characters. For larger channel index | |
83 | * numbers multiple letters get concatenated (sticking with letters). | |
84 | * | |
85 | * The current implementation covers these ranges: | |
86 | * - 94 single letter identifiers | |
87 | * - 26 ^ 2 = 676, 94 + 676 = 770 for two letter identifiers | |
88 | * - 26 ^ 3 = 17576, 770 + 17576 = 18346 for three letter identifiers | |
89 | * | |
90 | * This approach can get extended as needed when support for larger | |
91 | * channel counts is desired. Any such extension remains transparent | |
92 | * to call sites. | |
93 | * | |
94 | * TODO This implementation assumes that the software will run on a | |
95 | * machine which uses the ASCII character set. Platforms that use other | |
96 | * representations or non-contiguous character ranges for their alphabet | |
97 | * cannot use a simple addition, instead need to execute table lookups. | |
98 | */ | |
99 | ||
100 | #define VCD_IDENT_CHAR_MIN '!' | |
101 | #define VCD_IDENT_CHAR_MAX '~' | |
102 | #define VCD_IDENT_COUNT_1CHAR (VCD_IDENT_CHAR_MAX + 1 - VCD_IDENT_CHAR_MIN) | |
103 | #define VCD_IDENT_ALPHA_MIN 'a' | |
104 | #define VCD_IDENT_ALPHA_MAX 'z' | |
105 | #define VCD_IDENT_COUNT_ALPHA (VCD_IDENT_ALPHA_MAX + 1 - VCD_IDENT_ALPHA_MIN) | |
106 | #define VCD_IDENT_COUNT_2CHAR (VCD_IDENT_COUNT_ALPHA * VCD_IDENT_COUNT_ALPHA) | |
107 | #define VCD_IDENT_COUNT_3CHAR (VCD_IDENT_COUNT_2CHAR * VCD_IDENT_COUNT_ALPHA) | |
108 | #define VCD_IDENT_COUNT (VCD_IDENT_COUNT_1CHAR + VCD_IDENT_COUNT_2CHAR + VCD_IDENT_COUNT_3CHAR) | |
109 | ||
110 | static GString *vcd_identifier(size_t idx) | |
111 | { | |
112 | GString *symbol; | |
113 | char c1, c2, c3; | |
114 | ||
115 | symbol = g_string_sized_new(4); | |
116 | ||
117 | /* First 94 channels, one printable character. */ | |
118 | if (idx < VCD_IDENT_COUNT_1CHAR) { | |
119 | c1 = VCD_IDENT_CHAR_MIN + idx; | |
120 | g_string_printf(symbol, "%c", c1); | |
121 | return symbol; | |
122 | } | |
123 | idx -= VCD_IDENT_COUNT_1CHAR; | |
124 | ||
125 | /* Next 676 channels, two lower case characters. */ | |
126 | if (idx < VCD_IDENT_COUNT_2CHAR) { | |
127 | c2 = VCD_IDENT_ALPHA_MIN + (idx % VCD_IDENT_COUNT_ALPHA); | |
128 | idx /= VCD_IDENT_COUNT_ALPHA; | |
129 | c1 = VCD_IDENT_ALPHA_MIN + (idx % VCD_IDENT_COUNT_ALPHA); | |
130 | idx /= VCD_IDENT_COUNT_ALPHA; | |
131 | if (idx) | |
132 | sr_dbg("VCD identifier creation BUG (two char)."); | |
133 | g_string_printf(symbol, "%c%c", c1, c2); | |
134 | return symbol; | |
135 | } | |
136 | idx -= VCD_IDENT_COUNT_2CHAR; | |
137 | ||
138 | /* Next 17576 channels, three lower case characters. */ | |
139 | if (idx < VCD_IDENT_COUNT_3CHAR) { | |
140 | c3 = VCD_IDENT_ALPHA_MIN + (idx % VCD_IDENT_COUNT_ALPHA); | |
141 | idx /= VCD_IDENT_COUNT_ALPHA; | |
142 | c2 = VCD_IDENT_ALPHA_MIN + (idx % VCD_IDENT_COUNT_ALPHA); | |
143 | idx /= VCD_IDENT_COUNT_ALPHA; | |
144 | c1 = VCD_IDENT_ALPHA_MIN + (idx % VCD_IDENT_COUNT_ALPHA); | |
145 | idx /= VCD_IDENT_COUNT_ALPHA; | |
146 | if (idx) | |
147 | sr_dbg("VCD identifier creation BUG (three char)."); | |
148 | g_string_printf(symbol, "%c%c%c", c1, c2, c3); | |
149 | return symbol; | |
150 | } | |
151 | idx -= VCD_IDENT_COUNT_3CHAR; | |
152 | ||
153 | /* | |
154 | * TODO | |
155 | * Add combinations with more positions or larger character sets | |
156 | * when support for more channels is required. | |
157 | */ | |
158 | sr_dbg("VCD identifier creation ENOTSUPP (need %zu more).", idx); | |
159 | g_string_free(symbol, TRUE); | |
160 | ||
161 | return NULL; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Notes on the VCD text output formatting routines: | |
166 | * - Always start new text lines when timestamps get emitted. | |
167 | * - Optionally terminate timestamp lines when the caller asked us to. | |
168 | * - Prepend all values with whitespace, assume they follow a timestamp | |
169 | * or a previously printed value. This works fine from the data point | |
170 | * of view for the start of new lines, as well. | |
171 | * - Put the mandatory whitespace between real (or vector) values and | |
172 | * the following identifier. No whitespace for single bit values. | |
173 | * - For real values callers need not specify "precision" nor the number | |
174 | * of significant digits. The Verilog VCD spec specifically picked the | |
175 | * "%.16g" format such that all bits of the internal presentation of | |
176 | * the IEEE754 floating point value get communicated between the | |
177 | * writer and the reader. | |
178 | */ | |
179 | ||
180 | static void append_vcd_timestamp(GString *s, double ts, gboolean lf) | |
181 | { | |
182 | ||
183 | g_string_append_c(s, '\n'); | |
184 | g_string_append_c(s, '#'); | |
185 | g_string_append_printf(s, "%.0f", ts); | |
186 | g_string_append_c(s, lf ? '\n' : ' '); | |
187 | } | |
188 | ||
189 | static void format_vcd_value_bit(GString *s, uint8_t bit_value, GString *id) | |
190 | { | |
191 | ||
192 | g_string_append_c(s, bit_value ? '1' : '0'); | |
193 | g_string_append(s, id->str); | |
194 | } | |
195 | ||
196 | static void format_vcd_value_real(GString *s, double real_value, GString *id) | |
197 | { | |
198 | ||
199 | g_string_append_c(s, 'r'); | |
200 | g_string_append_printf(s, "%.16g", real_value); | |
201 | g_string_append_c(s, ' '); | |
202 | g_string_append(s, id->str); | |
203 | } | |
204 | ||
205 | static int init(struct sr_output *o, GHashTable *options) | |
206 | { | |
207 | struct context *ctx; | |
208 | size_t alloc_size; | |
209 | struct sr_channel *ch; | |
210 | GSList *l; | |
211 | size_t num_enabled, num_logic, num_analog, desc_idx; | |
212 | struct vcd_channel_desc *desc; | |
213 | ||
214 | (void)options; | |
215 | ||
216 | /* Determine the number of involved channels. */ | |
217 | num_enabled = 0; | |
218 | num_logic = 0; | |
219 | num_analog = 0; | |
220 | for (l = o->sdi->channels; l; l = l->next) { | |
221 | ch = l->data; | |
222 | if (!ch->enabled) | |
223 | continue; | |
224 | if (ch->type == SR_CHANNEL_LOGIC) { | |
225 | num_logic++; | |
226 | } else if (ch->type == SR_CHANNEL_ANALOG) { | |
227 | num_analog++; | |
228 | } else { | |
229 | continue; | |
230 | } | |
231 | num_enabled++; | |
232 | } | |
233 | if (num_enabled > VCD_IDENT_COUNT) { | |
234 | sr_err("Only up to %d VCD signals supported.", VCD_IDENT_COUNT); | |
235 | return SR_ERR; | |
236 | } | |
237 | ||
238 | /* Allocate space for channel descriptions. */ | |
239 | ctx = g_malloc0(sizeof(*ctx)); | |
240 | o->priv = ctx; | |
241 | ctx->enabled_count = num_enabled; | |
242 | ctx->logic_count = num_logic; | |
243 | ctx->analog_count = num_analog; | |
244 | alloc_size = sizeof(ctx->channels[0]) * ctx->enabled_count; | |
245 | ctx->channels = g_malloc0(alloc_size); | |
246 | ||
247 | /* | |
248 | * Reiterate input descriptions, to fill in output descriptions. | |
249 | * Map channel indices, and assign symbols to VCD channels. | |
250 | */ | |
251 | desc_idx = 0; | |
252 | for (l = o->sdi->channels; l; l = l->next) { | |
253 | ch = l->data; | |
254 | if (!ch->enabled) | |
255 | continue; | |
256 | desc = &ctx->channels[desc_idx]; | |
257 | desc->index = ch->index; | |
258 | desc->name = vcd_identifier(desc_idx); | |
259 | desc->type = ch->type; | |
260 | /* | |
261 | * Make sure to _not_ match next time, to have initial | |
262 | * values dumped when the first sample gets received. | |
263 | */ | |
264 | if (desc->type == SR_CHANNEL_LOGIC && num_logic) { | |
265 | num_logic--; | |
266 | desc->last.logic = ~0; | |
267 | } else if (desc->type == SR_CHANNEL_ANALOG && num_analog) { | |
268 | num_analog--; | |
269 | /* "Construct" NaN, avoid a compile time error. */ | |
270 | desc->last.real = 0.0; | |
271 | desc->last.real = 0.0 / desc->last.real; | |
272 | } else { | |
273 | g_string_free(desc->name, TRUE); | |
274 | memset(desc, 0, sizeof(*desc)); | |
275 | continue; | |
276 | } | |
277 | desc_idx++; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Keep channel counts at hand, and a flag which allows to tune | |
282 | * for special cases' speedup in .receive(). | |
283 | */ | |
284 | ctx->immediate_write = FALSE; | |
285 | if (ctx->analog_count == 0) | |
286 | ctx->immediate_write = TRUE; | |
287 | if (ctx->logic_count == 0 && ctx->analog_count == 1) | |
288 | ctx->immediate_write = TRUE; | |
289 | ||
290 | /* | |
291 | * Keep a copy of the last logic data bitmap around. To avoid | |
292 | * iterating over individual bits when nothing in the set has | |
293 | * changed. The overhead of two byte array compares should | |
294 | * outweight the tenfold bit count compared to byte counts. | |
295 | */ | |
296 | alloc_size = (ctx->logic_count + 7) / 8; | |
297 | ctx->last_logic = g_malloc0(alloc_size); | |
298 | if (ctx->logic_count && !ctx->last_logic) | |
299 | return SR_ERR_MALLOC; | |
300 | ||
301 | return SR_OK; | |
302 | } | |
303 | ||
304 | /* | |
305 | * VCD can only handle 1/10/100 factors in the s to fs range. Find a | |
306 | * suitable timescale which satisfies this resolution constraint, yet | |
307 | * won't result in excessive overhead. | |
308 | */ | |
309 | static uint64_t get_timescale_freq(uint64_t samplerate) | |
310 | { | |
311 | uint64_t timescale; | |
312 | size_t max_up_scale; | |
313 | ||
314 | /* Go to the next full decade. */ | |
315 | timescale = 1; | |
316 | while (timescale < samplerate) { | |
317 | timescale *= 10; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Avoid loss of precision, go up a few more decades when needed. | |
322 | * For example switch to 10GHz timescale when samplerate is 400MHz. | |
323 | * Stop after at most factor 100 to not loop endlessly for odd | |
324 | * samplerates, yet provide good enough accuracy. | |
325 | */ | |
326 | max_up_scale = 2; | |
327 | while (max_up_scale--) { | |
328 | if (timescale / samplerate * samplerate == timescale) | |
329 | break; | |
330 | timescale *= 10; | |
331 | } | |
332 | ||
333 | return timescale; | |
334 | } | |
335 | ||
336 | /* Emit a VCD file header. */ | |
337 | static GString *gen_header(const struct sr_output *o) | |
338 | { | |
339 | struct context *ctx; | |
340 | struct sr_channel *ch; | |
341 | GVariant *gvar; | |
342 | GString *header; | |
343 | GSList *l; | |
344 | time_t t; | |
345 | size_t num_channels, i; | |
346 | char *samplerate_s, *frequency_s, *timestamp; | |
347 | struct vcd_channel_desc *desc; | |
348 | char *type_text, *size_text; | |
349 | int ret; | |
350 | ||
351 | ctx = o->priv; | |
352 | ||
353 | /* Get channel count, and samplerate if not done yet. */ | |
354 | num_channels = g_slist_length(o->sdi->channels); | |
355 | if (!ctx->samplerate) { | |
356 | ret = sr_config_get(o->sdi->driver, o->sdi, NULL, | |
357 | SR_CONF_SAMPLERATE, &gvar); | |
358 | if (ret == SR_OK) { | |
359 | ctx->samplerate = g_variant_get_uint64(gvar); | |
360 | g_variant_unref(gvar); | |
361 | } | |
362 | } | |
363 | ctx->period = get_timescale_freq(ctx->samplerate); | |
364 | t = time(NULL); | |
365 | timestamp = g_strdup(ctime(&t)); | |
366 | timestamp[strlen(timestamp) - 1] = '\0'; | |
367 | samplerate_s = NULL; | |
368 | if (ctx->samplerate) | |
369 | samplerate_s = sr_samplerate_string(ctx->samplerate); | |
370 | frequency_s = sr_period_string(1, ctx->period); | |
371 | ||
372 | /* Construct the VCD output file header. */ | |
373 | header = g_string_sized_new(512); | |
374 | g_string_printf(header, "$date %s $end\n", timestamp); | |
375 | g_string_append_printf(header, "$version %s %s $end\n", | |
376 | PACKAGE_NAME, sr_package_version_string_get()); | |
377 | g_string_append_printf(header, "$comment\n"); | |
378 | g_string_append_printf(header, | |
379 | " Acquisition with %zu/%zu channels%s%s\n", | |
380 | ctx->enabled_count, num_channels, | |
381 | samplerate_s ? " at " : "", samplerate_s ? : ""); | |
382 | g_string_append_printf(header, "$end\n"); | |
383 | g_string_append_printf(header, "$timescale %s $end\n", frequency_s); | |
384 | ||
385 | /* List generated VCD signals within a scope. */ | |
386 | g_string_append_printf(header, "$scope module %s $end\n", PACKAGE_NAME); | |
387 | i = 0; | |
388 | for (l = o->sdi->channels; l; l = l->next) { | |
389 | ch = l->data; | |
390 | if (!ch->enabled) | |
391 | continue; | |
392 | desc = &ctx->channels[i++]; | |
393 | if (desc->type == SR_CHANNEL_LOGIC) { | |
394 | type_text = "wire"; | |
395 | size_text = "1"; | |
396 | } else if (desc->type == SR_CHANNEL_ANALOG) { | |
397 | type_text = "real"; | |
398 | size_text = "64"; | |
399 | } else { | |
400 | i--; | |
401 | continue; | |
402 | } | |
403 | g_string_append_printf(header, "$var %s %s %s %s $end\n", | |
404 | type_text, size_text, desc->name->str, ch->name); | |
405 | } | |
406 | g_string_append(header, "$upscope $end\n"); | |
407 | ||
408 | g_string_append(header, "$enddefinitions $end\n"); | |
409 | ||
410 | g_free(timestamp); | |
411 | g_free(samplerate_s); | |
412 | g_free(frequency_s); | |
413 | ||
414 | return header; | |
415 | } | |
416 | ||
417 | /* | |
418 | * Gets called when a session feed packet was received. Either creates | |
419 | * a VCD file header (once in the output module's lifetime), or an empty | |
420 | * GString. Callers will append the text representation of sample data | |
421 | * to that string as needed. | |
422 | */ | |
423 | static GString *chk_header(const struct sr_output *o) | |
424 | { | |
425 | struct context *ctx; | |
426 | GString *s; | |
427 | ||
428 | ctx = o->priv; | |
429 | ||
430 | if (!ctx->header_done) { | |
431 | ctx->header_done = TRUE; | |
432 | s = gen_header(o); | |
433 | } else { | |
434 | s = g_string_sized_new(512); | |
435 | } | |
436 | ||
437 | return s; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Helpers to "merge sort" sample data that we have received in chunks | |
442 | * at different times in different code paths. Queue the data until we | |
443 | * have seen samples from all involved channels for a given samplenumber. | |
444 | * Data for a given sample number can only get emitted when we are sure | |
445 | * no other channel's data can arrive any more. | |
446 | */ | |
447 | ||
448 | static struct vcd_queue_item *queue_alloc_item(struct context *ctx, uint64_t snum) | |
449 | { | |
450 | GSList *node; | |
451 | struct vcd_queue_item *item; | |
452 | ||
453 | /* Get an item from the free list if available. */ | |
454 | node = ctx->free_list; | |
455 | if (node) { | |
456 | ctx->reused++; | |
457 | ||
458 | /* Unlink GSList node from the free list. */ | |
459 | ctx->free_list = node->next; | |
460 | node->next = NULL; | |
461 | item = node->data; | |
462 | node->data = NULL; | |
463 | ||
464 | /* Setup content of the item. */ | |
465 | item->samplenum = snum; | |
466 | if (!item->values) | |
467 | item->values = g_string_sized_new(32); | |
468 | else | |
469 | g_string_truncate(item->values, 0); | |
470 | ||
471 | /* Keep GSList node in the used list (avoid free/alloc). */ | |
472 | node->next = ctx->used_list; | |
473 | ctx->used_list = node; | |
474 | ||
475 | return item; | |
476 | } | |
477 | ||
478 | /* Dynamic allocation of an item. */ | |
479 | ctx->alloced++; | |
480 | item = g_malloc0(sizeof(*item)); | |
481 | if (!item) | |
482 | return NULL; | |
483 | item->samplenum = snum; | |
484 | item->values = g_string_sized_new(32); | |
485 | ||
486 | /* Create a used list item, to later move to the free list. */ | |
487 | ctx->used_list = g_slist_prepend(ctx->used_list, item); | |
488 | ||
489 | return item; | |
490 | } | |
491 | ||
492 | static void queue_free_item(struct context *ctx, struct vcd_queue_item *item) | |
493 | { | |
494 | GSList *node; | |
495 | ||
496 | /* | |
497 | * Put item back into the free list. We can assume to find a | |
498 | * used list node, it got allocated when the item was acquired. | |
499 | */ | |
500 | node = ctx->used_list; | |
501 | if (node) { | |
502 | ctx->pooled++; | |
503 | ||
504 | ctx->used_list = node->next; | |
505 | node->next = NULL; | |
506 | node->data = item; | |
507 | ||
508 | item->samplenum = 0; | |
509 | g_string_truncate(item->values, 0); | |
510 | ||
511 | node->next = ctx->free_list; | |
512 | ctx->free_list = node; | |
513 | ||
514 | return; | |
515 | } | |
516 | ||
517 | /* | |
518 | * Release dynamically allocated resources. Could also be used | |
519 | * to release free list items when the use list is empty. | |
520 | */ | |
521 | ctx->freed++; | |
522 | if (item->values) | |
523 | g_string_free(item->values, TRUE); | |
524 | g_free(item); | |
525 | } | |
526 | ||
527 | static void queue_drain_pool_cb(gpointer data, gpointer cb_data) | |
528 | { | |
529 | struct context *ctx; | |
530 | struct vcd_queue_item *item; | |
531 | ||
532 | item = data; | |
533 | ctx = cb_data; | |
534 | queue_free_item(ctx, item); | |
535 | } | |
536 | ||
537 | static void queue_drain_pool(struct context *ctx) | |
538 | { | |
539 | GSList *list; | |
540 | ||
541 | /* | |
542 | * Grab the list and "empty" the context member. Then | |
543 | * iterate over the items, have dymamic memory released. | |
544 | * Then free the GSList nodes (but not their data parts). | |
545 | * Do this for the used and the free lists. | |
546 | */ | |
547 | list = ctx->used_list; | |
548 | ctx->used_list = NULL; | |
549 | g_slist_foreach(list, queue_drain_pool_cb, ctx); | |
550 | g_slist_free(list); | |
551 | ||
552 | list = ctx->free_list; | |
553 | ctx->free_list = NULL; | |
554 | g_slist_foreach(list, queue_drain_pool_cb, ctx); | |
555 | g_slist_free(list); | |
556 | } | |
557 | ||
558 | static int cmp_snum(gconstpointer l, gconstpointer d) | |
559 | { | |
560 | const struct vcd_queue_item *list_item; | |
561 | const uint64_t *snum_ptr; | |
562 | ||
563 | list_item = l; | |
564 | snum_ptr = d; | |
565 | if (list_item->samplenum > *snum_ptr) | |
566 | return +1; | |
567 | if (list_item->samplenum < *snum_ptr) | |
568 | return -1; | |
569 | return 0; | |
570 | } | |
571 | ||
572 | static int cmp_items(gconstpointer a, gconstpointer b) | |
573 | { | |
574 | const struct vcd_queue_item *item_a, *item_b; | |
575 | ||
576 | item_a = a; | |
577 | item_b = b; | |
578 | if (item_a->samplenum > item_b->samplenum) | |
579 | return +1; | |
580 | if (item_a->samplenum < item_b->samplenum) | |
581 | return -1; | |
582 | return 0; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Position the current pointer of the VCD value queue to a specific | |
587 | * sample number. Create a new queue item when needed. The logic assumes | |
588 | * a specific use pattern: Reception of striped sample data for channels | |
589 | * and processing in strict order of sample numbers within a channel. | |
590 | * Lower sample numbers near the start of the queue when channels change | |
591 | * between session feed packets, before another linear sequence follows. | |
592 | * | |
593 | * Naive use of convenience glib routines would severely lose performance. | |
594 | * That's why custom code is used, which is as complex as it needs to be, | |
595 | * yet shall execute faster than a simpler implementation. For trivial | |
596 | * cases (logic only, one analog channel only) this queue is bypassed. | |
597 | */ | |
598 | static int queue_samplenum(struct context *ctx, uint64_t snum) | |
599 | { | |
600 | struct vcd_queue_item *item, *add_item; | |
601 | GList *walk_list, *after_snum, *before_snum, *add_list; | |
602 | GList *last; | |
603 | gboolean add_after_last, do_search; | |
604 | ||
605 | /* Already at that position? */ | |
606 | item = ctx->vcd_queue_last ? ctx->vcd_queue_last->data : NULL; | |
607 | if (item && item->samplenum == snum) | |
608 | return SR_OK; | |
609 | ||
610 | /* | |
611 | * Search after the current position in the remaining queue. The | |
612 | * custom code uses the queue's being sorted by sample number. | |
613 | * Narrow down a later insert position as much as possible. This | |
614 | * avoids linear search in huge spaces later on. | |
615 | */ | |
616 | last = NULL; | |
617 | add_after_last = FALSE; | |
618 | after_snum = NULL; | |
619 | before_snum = NULL; | |
620 | walk_list = ctx->vcd_queue_last; | |
621 | while (walk_list) { | |
622 | item = walk_list->data; | |
623 | if (!item) | |
624 | break; | |
625 | if (item->samplenum == snum) { | |
626 | ctx->vcd_queue_last = walk_list; | |
627 | return SR_OK; | |
628 | } | |
629 | last = walk_list; | |
630 | if (item->samplenum < snum) | |
631 | before_snum = walk_list; | |
632 | if (item->samplenum > snum) { | |
633 | after_snum = walk_list; | |
634 | break; | |
635 | } | |
636 | if (!walk_list->next) | |
637 | add_after_last = TRUE; | |
638 | walk_list = walk_list->next; | |
639 | } | |
640 | ||
641 | /* | |
642 | * No exact match at or beyond the current position. Run another | |
643 | * search from the start of the queue, again restrict the space | |
644 | * which is searched, and narrow down the insert position when | |
645 | * no match is found. | |
646 | * | |
647 | * If the searched sample number is larger than any we have seen | |
648 | * before, or was in the above covered range but was not found, | |
649 | * then we know that another queue item needs to get added, and | |
650 | * where to put it. In that case we need not iterate the earlier | |
651 | * list items. | |
652 | */ | |
653 | walk_list = ctx->vcd_queue_list; | |
654 | do_search = TRUE; | |
655 | if (add_after_last) | |
656 | do_search = FALSE; | |
657 | if (before_snum) | |
658 | do_search = FALSE; | |
659 | while (do_search && walk_list && walk_list != ctx->vcd_queue_last) { | |
660 | item = walk_list->data; | |
661 | if (!item) | |
662 | break; | |
663 | if (item->samplenum == snum) { | |
664 | ctx->vcd_queue_last = walk_list; | |
665 | return SR_OK; | |
666 | } | |
667 | if (item->samplenum < snum) | |
668 | before_snum = walk_list; | |
669 | if (item->samplenum > snum) { | |
670 | after_snum = walk_list; | |
671 | break; | |
672 | } | |
673 | walk_list = walk_list->next; | |
674 | } | |
675 | ||
676 | /* | |
677 | * The complete existing queue was exhausted, no exact match was | |
678 | * found. A new queue item must get inserted. Identify a good | |
679 | * position where to start searching for the exact position to | |
680 | * link the new item to the list. Assume that the combination of | |
681 | * the glib routine's list traversal and the sample number check | |
682 | * in the callback is expensive, reduce the amount of work done. | |
683 | * | |
684 | * If we have seen an item with a larger sample number than the | |
685 | * wanted, check its immediate predecessor. If this has a smaller | |
686 | * sample number, then we found a perfect location to insert the | |
687 | * new item. If we know that the new item must be inserted after | |
688 | * the last traversed queue item, start there. | |
689 | */ | |
690 | if (!before_snum) do { | |
691 | if (add_after_last) | |
692 | break; | |
693 | if (!after_snum) | |
694 | break; | |
695 | walk_list = after_snum->prev; | |
696 | if (!walk_list) | |
697 | break; | |
698 | item = walk_list->data; | |
699 | if (!item) | |
700 | break; | |
701 | if (item->samplenum == snum) { | |
702 | ctx->vcd_queue_last = walk_list; | |
703 | return SR_OK; | |
704 | } | |
705 | if (item->samplenum < snum) | |
706 | before_snum = walk_list; | |
707 | } while (0); | |
708 | add_list = add_after_last ? last : before_snum; | |
709 | if (!add_list) { | |
710 | walk_list = ctx->vcd_queue_list; | |
711 | while (walk_list) { | |
712 | item = walk_list->data; | |
713 | if (!item) | |
714 | break; | |
715 | if (item->samplenum == snum) { | |
716 | ctx->vcd_queue_last = walk_list; | |
717 | return SR_OK; | |
718 | } | |
719 | if (item->samplenum > snum) { | |
720 | after_snum = walk_list; | |
721 | break; | |
722 | } | |
723 | add_list = walk_list; | |
724 | walk_list = walk_list->next; | |
725 | } | |
726 | } | |
727 | if (add_list && (item = add_list->data) && item->samplenum == snum) { | |
728 | ctx->vcd_queue_last = add_list; | |
729 | return SR_OK; | |
730 | } | |
731 | ||
732 | /* | |
733 | * Create a new queue item for the so far untracked sample | |
734 | * number. Immediately search for the inserted position (is | |
735 | * unfortunately not returned from the insert call), and | |
736 | * cache that position for subsequent lookups. | |
737 | */ | |
738 | if (with_queue_stats) | |
739 | sr_dbg("%s(), queue nr %" PRIu64, __func__, snum); | |
740 | add_item = queue_alloc_item(ctx, snum); | |
741 | if (!add_item) | |
742 | return SR_ERR_MALLOC; | |
743 | if (!add_list) | |
744 | add_list = ctx->vcd_queue_list; | |
745 | if (add_list && add_list->prev) | |
746 | add_list = add_list->prev; | |
747 | walk_list = g_list_insert_sorted(add_list, add_item, cmp_items); | |
748 | if (!walk_list->prev) | |
749 | ctx->vcd_queue_list = walk_list; | |
750 | walk_list = g_list_find_custom(walk_list, &snum, cmp_snum); | |
751 | item = walk_list ? walk_list->data : NULL; | |
752 | if (item && item->samplenum == snum) { | |
753 | ctx->vcd_queue_last = walk_list; | |
754 | } | |
755 | return SR_OK; | |
756 | } | |
757 | ||
758 | /* | |
759 | * Prepare to append another text fragment for a value change to the | |
760 | * queue item which corresponds to the current sample number. Return | |
761 | * the GString which the caller then will append to. | |
762 | */ | |
763 | static GString *queue_value_text_prep(struct context *ctx) | |
764 | { | |
765 | struct vcd_queue_item *item; | |
766 | GString *buff; | |
767 | ||
768 | /* Cope with not-yet-positioned write pointers. */ | |
769 | item = ctx->vcd_queue_last ? ctx->vcd_queue_last->data : NULL; | |
770 | if (!item) | |
771 | return NULL; | |
772 | ||
773 | /* Create a GString if not done already. */ | |
774 | buff = item->values; | |
775 | if (!buff) { | |
776 | buff = g_string_sized_new(20); | |
777 | item->values = buff; | |
778 | } | |
779 | ||
780 | /* Separate items with spaces (if previous content is present). */ | |
781 | if (buff->len) | |
782 | g_string_append_c(buff, ' '); | |
783 | ||
784 | return buff; | |
785 | } | |
786 | ||
787 | static double snum_to_ts(struct context *ctx, uint64_t snum) | |
788 | { | |
789 | double ts; | |
790 | ||
791 | ts = (double)snum; | |
792 | ts /= ctx->samplerate; | |
793 | ts *= ctx->period; | |
794 | ||
795 | return ts; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Unqueue one item of the VCD values queue which corresponds to one | |
800 | * sample number. Append all of the text to the passed in GString. | |
801 | */ | |
802 | static int unqueue_item(struct context *ctx, | |
803 | struct vcd_queue_item *item, GString *s) | |
804 | { | |
805 | double ts; | |
806 | GString *buff; | |
807 | gboolean is_empty; | |
808 | ||
809 | /* | |
810 | * Start the sample number's string with the timestamp. Append | |
811 | * all value changes. Terminate lines for items which have a | |
812 | * timestamp but no value changes, assuming this is the last | |
813 | * entry which corresponds to SR_DF_END. | |
814 | */ | |
815 | ts = snum_to_ts(ctx, item->samplenum); | |
816 | buff = item->values; | |
817 | is_empty = !buff || !buff->len || !buff->str || !*buff->str; | |
818 | append_vcd_timestamp(s, ts, is_empty); | |
819 | if (!is_empty) | |
820 | g_string_append(s, buff->str); | |
821 | ||
822 | return SR_OK; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Get the last sample number which logic data was received for. This | |
827 | * implementation assumes that all logic channels get received within | |
828 | * exactly one packet of corresponding unitsize. | |
829 | */ | |
830 | static uint64_t get_last_snum_logic(struct context *ctx) | |
831 | { | |
832 | size_t i; | |
833 | struct vcd_channel_desc *desc; | |
834 | ||
835 | for (i = 0; i < ctx->enabled_count; i++) { | |
836 | desc = &ctx->channels[i]; | |
837 | if (desc->type != SR_CHANNEL_LOGIC) | |
838 | continue; | |
839 | return desc->last_rcvd_snum; | |
840 | } | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | /* | |
846 | * Update the last sample number which logic data was received for. | |
847 | */ | |
848 | static void upd_last_snum_logic(struct context *ctx, uint64_t inc) | |
849 | { | |
850 | size_t i; | |
851 | struct vcd_channel_desc *desc; | |
852 | ||
853 | for (i = 0; i < ctx->enabled_count; i++) { | |
854 | desc = &ctx->channels[i]; | |
855 | if (desc->type != SR_CHANNEL_LOGIC) | |
856 | continue; | |
857 | desc->last_rcvd_snum += inc; | |
858 | } | |
859 | } | |
860 | ||
861 | /* | |
862 | * Get and update the last sample number which analog data was received | |
863 | * for on a specific channel (which the caller already has identified). | |
864 | */ | |
865 | ||
866 | static uint64_t get_last_snum_analog(struct vcd_channel_desc *desc) | |
867 | { | |
868 | ||
869 | return desc->last_rcvd_snum; | |
870 | } | |
871 | ||
872 | static void upd_last_snum_analog(struct vcd_channel_desc *desc, uint64_t inc) | |
873 | { | |
874 | ||
875 | if (!desc) | |
876 | return; | |
877 | desc->last_rcvd_snum += inc; | |
878 | } | |
879 | ||
880 | /* | |
881 | * Determine the maximum sample number which data from all involved | |
882 | * channels was received for. | |
883 | */ | |
884 | static uint64_t get_max_snum_export(struct context *ctx) | |
885 | { | |
886 | uint64_t snum; | |
887 | size_t i; | |
888 | struct vcd_channel_desc *desc; | |
889 | ||
890 | snum = ~UINT64_C(0); | |
891 | for (i = 0; i < ctx->enabled_count; i++) { | |
892 | desc = &ctx->channels[i]; | |
893 | if (snum > desc->last_rcvd_snum) | |
894 | snum = desc->last_rcvd_snum; | |
895 | } | |
896 | ||
897 | return snum; | |
898 | } | |
899 | ||
900 | /* | |
901 | * Determine the maximum sample number of any channel we may have | |
902 | * received data for. Then pretend we had seen that number of samples | |
903 | * on all channels. Such that the next export can flush all previously | |
904 | * queued data up to and including the final number, which serves as | |
905 | * some kind of termination of the VCD output data. | |
906 | */ | |
907 | static uint64_t get_max_snum_flush(struct context *ctx) | |
908 | { | |
909 | uint64_t snum; | |
910 | size_t i; | |
911 | struct vcd_channel_desc *desc; | |
912 | ||
913 | /* Determine the maximum sample number. */ | |
914 | snum = 0; | |
915 | for (i = 0; i < ctx->enabled_count; i++) { | |
916 | desc = &ctx->channels[i]; | |
917 | if (snum < desc->last_rcvd_snum) | |
918 | snum = desc->last_rcvd_snum; | |
919 | } | |
920 | ||
921 | /* Record that number as "seen" with all channels. */ | |
922 | for (i = 0; i < ctx->enabled_count; i++) { | |
923 | desc = &ctx->channels[i]; | |
924 | desc->last_rcvd_snum = snum + 1; | |
925 | } | |
926 | ||
927 | return snum; | |
928 | } | |
929 | ||
930 | /* | |
931 | * Pass all queued value changes when we are certain we have received | |
932 | * data from all channels. | |
933 | */ | |
934 | static int write_completed_changes(struct context *ctx, GString *out) | |
935 | { | |
936 | uint64_t upto_snum; | |
937 | GList **listref, *node; | |
938 | struct vcd_queue_item *item; | |
939 | int rc; | |
940 | size_t dumped; | |
941 | ||
942 | /* Determine the number which all data was received for so far. */ | |
943 | upto_snum = get_max_snum_export(ctx); | |
944 | if (with_queue_stats) | |
945 | sr_spew("%s(), check up to %" PRIu64, __func__, upto_snum); | |
946 | ||
947 | /* | |
948 | * Forward and consume those items from the head of the list | |
949 | * which we completely have accumulated and are certain about. | |
950 | */ | |
951 | dumped = 0; | |
952 | listref = &ctx->vcd_queue_list; | |
953 | while (*listref) { | |
954 | /* Find items before the targetted sample number. */ | |
955 | node = *listref; | |
956 | item = node->data; | |
957 | if (!item) | |
958 | break; | |
959 | if (item->samplenum >= upto_snum) | |
960 | break; | |
961 | ||
962 | /* | |
963 | * Unlink the item from the list. Void cached positions. | |
964 | * Append its timestamp and values to the caller's text. | |
965 | */ | |
966 | dumped++; | |
967 | if (with_queue_stats) | |
968 | sr_dbg("%s(), dump nr %" PRIu64, | |
969 | __func__, item->samplenum); | |
970 | if (ctx->vcd_queue_last == node) | |
971 | ctx->vcd_queue_last = NULL; | |
972 | *listref = g_list_remove_link(*listref, node); | |
973 | rc = unqueue_item(ctx, item, out); | |
974 | queue_free_item(ctx, item); | |
975 | if (rc != SR_OK) | |
976 | return rc; | |
977 | } | |
978 | ||
979 | return SR_OK; | |
980 | } | |
981 | ||
982 | /* Get packets from the session feed, generate output text. */ | |
983 | static int receive(const struct sr_output *o, | |
984 | const struct sr_datafeed_packet *packet, GString **out) | |
985 | { | |
986 | struct context *ctx; | |
987 | const struct sr_datafeed_meta *meta; | |
988 | const struct sr_datafeed_logic *logic; | |
989 | const struct sr_datafeed_analog *analog; | |
990 | const struct sr_config *src; | |
991 | GSList *l; | |
992 | struct vcd_channel_desc *desc; | |
993 | uint64_t snum_curr; | |
994 | size_t count, index, p, unit_size; | |
995 | gboolean changed; | |
996 | GString *s_val; | |
997 | uint8_t *sample, *last_logic, prevbit, curbit; | |
998 | GSList *channels; | |
999 | struct sr_channel *channel; | |
1000 | int rc; | |
1001 | float *floats, value; | |
1002 | double ts; | |
1003 | ||
1004 | *out = NULL; | |
1005 | if (!o || !o->priv) | |
1006 | return SR_ERR_BUG; | |
1007 | ctx = o->priv; | |
1008 | ||
1009 | switch (packet->type) { | |
1010 | case SR_DF_META: | |
1011 | meta = packet->payload; | |
1012 | for (l = meta->config; l; l = l->next) { | |
1013 | src = l->data; | |
1014 | if (src->key != SR_CONF_SAMPLERATE) | |
1015 | continue; | |
1016 | ctx->samplerate = g_variant_get_uint64(src->data); | |
1017 | } | |
1018 | break; | |
1019 | case SR_DF_LOGIC: | |
1020 | *out = chk_header(o); | |
1021 | ||
1022 | logic = packet->payload; | |
1023 | sample = logic->data; | |
1024 | unit_size = logic->unitsize; | |
1025 | count = logic->length / unit_size; | |
1026 | snum_curr = get_last_snum_logic(ctx); | |
1027 | upd_last_snum_logic(ctx, count); | |
1028 | ||
1029 | last_logic = ctx->last_logic; | |
1030 | while (count--) { | |
1031 | /* Check whether any logic value has changed. */ | |
1032 | changed = memcmp(last_logic, sample, unit_size) != 0; | |
1033 | changed |= snum_curr == 0; | |
1034 | if (changed) | |
1035 | memcpy(last_logic, sample, unit_size); | |
1036 | ||
1037 | /* | |
1038 | * Start or continue tracking that sample number. | |
1039 | * Avoid string copies for logic-only setups. | |
1040 | */ | |
1041 | if (changed) { | |
1042 | if (ctx->immediate_write) { | |
1043 | ts = snum_to_ts(ctx, snum_curr); | |
1044 | append_vcd_timestamp(*out, ts, FALSE); | |
1045 | } else { | |
1046 | queue_samplenum(ctx, snum_curr); | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | /* Iterate over individual logic channels. */ | |
1051 | for (p = 0; changed && p < ctx->enabled_count; p++) { | |
1052 | /* | |
1053 | * TODO Check whether the mapping from | |
1054 | * data image positions to channel numbers | |
1055 | * is required. Experiments suggest that | |
1056 | * the data image "is dense", and packs | |
1057 | * bits of enabled channels, and leaves no | |
1058 | * room for positions of disabled channels. | |
1059 | */ | |
1060 | desc = &ctx->channels[p]; | |
1061 | if (desc->type != SR_CHANNEL_LOGIC) | |
1062 | continue; | |
1063 | index = desc->index; | |
1064 | prevbit = desc->last.logic; | |
1065 | ||
1066 | /* Skip over unchanged values. */ | |
1067 | curbit = sample[index / 8]; | |
1068 | curbit = (curbit & (1 << (index % 8))) ? 1 : 0; | |
1069 | if (snum_curr != 0 && prevbit == curbit) | |
1070 | continue; | |
1071 | desc->last.logic = curbit; | |
1072 | ||
1073 | /* | |
1074 | * Queue, or immediately emit the text for | |
1075 | * the observed value change. | |
1076 | */ | |
1077 | if (ctx->immediate_write) { | |
1078 | g_string_append_c(*out, ' '); | |
1079 | s_val = *out; | |
1080 | } else { | |
1081 | s_val = queue_value_text_prep(ctx); | |
1082 | if (!s_val) | |
1083 | break; | |
1084 | } | |
1085 | format_vcd_value_bit(s_val, curbit, desc->name); | |
1086 | } | |
1087 | ||
1088 | /* Advance to next set of logic samples. */ | |
1089 | snum_curr++; | |
1090 | sample += unit_size; | |
1091 | } | |
1092 | write_completed_changes(ctx, *out); | |
1093 | break; | |
1094 | case SR_DF_ANALOG: | |
1095 | *out = chk_header(o); | |
1096 | ||
1097 | /* | |
1098 | * This implementation expects one analog packet per | |
1099 | * individual channel, with a number of samples each. | |
1100 | * Lookup the VCD output channel description. | |
1101 | */ | |
1102 | analog = packet->payload; | |
1103 | count = analog->num_samples; | |
1104 | channels = analog->meaning->channels; | |
1105 | if (g_slist_length(channels) != 1) { | |
1106 | sr_err("Analog packets must be single-channel."); | |
1107 | return SR_ERR_ARG; | |
1108 | } | |
1109 | channel = g_slist_nth_data(channels, 0); | |
1110 | desc = NULL; | |
1111 | for (index = 0; index < ctx->enabled_count; index++) { | |
1112 | desc = &ctx->channels[index]; | |
1113 | if ((int)desc->index == channel->index) | |
1114 | break; | |
1115 | } | |
1116 | if (!desc) | |
1117 | return SR_OK; | |
1118 | if (desc->type != SR_CHANNEL_ANALOG) | |
1119 | return SR_ERR; | |
1120 | snum_curr = get_last_snum_analog(desc); | |
1121 | upd_last_snum_analog(desc, count); | |
1122 | ||
1123 | /* | |
1124 | * Convert incoming data to an array of single precision | |
1125 | * floating point values. | |
1126 | */ | |
1127 | floats = g_try_malloc(sizeof(*floats) * analog->num_samples); | |
1128 | if (!floats) | |
1129 | return SR_ERR_MALLOC; | |
1130 | rc = sr_analog_to_float(analog, floats); | |
1131 | if (rc != SR_OK) { | |
1132 | g_free(floats); | |
1133 | return rc; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Check for changes in the channel's values. Have the | |
1138 | * sample number's timestamp and new value printed when | |
1139 | * the value has changed. | |
1140 | */ | |
1141 | for (index = 0; index < count; index++) { | |
1142 | /* Check for changes in the channel's values. */ | |
1143 | value = floats[index]; | |
1144 | changed = value != desc->last.real; | |
1145 | changed |= snum_curr + index == 0; | |
1146 | if (!changed) | |
1147 | continue; | |
1148 | desc->last.real = value; | |
1149 | ||
1150 | /* Queue, or emit the timestamp and the new value. */ | |
1151 | if (ctx->immediate_write) { | |
1152 | ts = snum_to_ts(ctx, snum_curr + index); | |
1153 | append_vcd_timestamp(*out, ts, FALSE); | |
1154 | s_val = *out; | |
1155 | } else { | |
1156 | queue_samplenum(ctx, snum_curr + index); | |
1157 | s_val = queue_value_text_prep(ctx); | |
1158 | } | |
1159 | format_vcd_value_real(s_val, value, desc->name); | |
1160 | } | |
1161 | ||
1162 | g_free(floats); | |
1163 | write_completed_changes(ctx, *out); | |
1164 | break; | |
1165 | case SR_DF_END: | |
1166 | *out = chk_header(o); | |
1167 | /* Push the final timestamp as length indicator. */ | |
1168 | snum_curr = get_max_snum_flush(ctx); | |
1169 | queue_samplenum(ctx, snum_curr); | |
1170 | /* Flush previously queued value changes. */ | |
1171 | write_completed_changes(ctx, *out); | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | return SR_OK; | |
1176 | } | |
1177 | ||
1178 | static int cleanup(struct sr_output *o) | |
1179 | { | |
1180 | struct context *ctx; | |
1181 | struct vcd_channel_desc *desc; | |
1182 | ||
1183 | if (!o || !o->priv) | |
1184 | return SR_ERR_ARG; | |
1185 | ||
1186 | ctx = o->priv; | |
1187 | ||
1188 | if (with_pool_stats) | |
1189 | sr_info("STATS: alloc/reuse %zu/%zu, pool/free %zu/%zu", | |
1190 | ctx->alloced, ctx->reused, ctx->pooled, ctx->freed); | |
1191 | queue_drain_pool(ctx); | |
1192 | if (with_pool_stats) | |
1193 | sr_info("STATS: alloc/reuse %zu/%zu, pool/free %zu/%zu", | |
1194 | ctx->alloced, ctx->reused, ctx->pooled, ctx->freed); | |
1195 | ||
1196 | while (ctx->enabled_count--) { | |
1197 | desc = &ctx->channels[ctx->enabled_count]; | |
1198 | g_string_free(desc->name, TRUE); | |
1199 | } | |
1200 | g_free(ctx->channels); | |
1201 | g_free(ctx); | |
1202 | ||
1203 | return SR_OK; | |
1204 | } | |
1205 | ||
1206 | struct sr_output_module output_vcd = { | |
1207 | .id = "vcd", | |
1208 | .name = "VCD", | |
1209 | .desc = "Value Change Dump data", | |
1210 | .exts = (const char*[]){"vcd", NULL}, | |
1211 | .flags = 0, | |
1212 | .options = NULL, | |
1213 | .init = init, | |
1214 | .receive = receive, | |
1215 | .cleanup = cleanup, | |
1216 | }; |