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1 | /* | |
2 | * This file is part of the libsigrokdecode project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
23 | #include "libsigrokdecode.h" | |
24 | #include <glib.h> | |
25 | #include <inttypes.h> | |
26 | #include <stdlib.h> | |
27 | #include <stdint.h> | |
28 | ||
29 | /** @cond PRIVATE */ | |
30 | ||
31 | extern SRD_PRIV GSList *sessions; | |
32 | ||
33 | static void srd_inst_join_decode_thread(struct srd_decoder_inst *di); | |
34 | static void srd_inst_reset_state(struct srd_decoder_inst *di); | |
35 | SRD_PRIV void oldpins_array_seed(struct srd_decoder_inst *di); | |
36 | SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di); | |
37 | ||
38 | /** @endcond */ | |
39 | ||
40 | /** | |
41 | * @file | |
42 | * | |
43 | * Decoder instance handling. | |
44 | */ | |
45 | ||
46 | /** | |
47 | * @defgroup grp_instances Decoder instances | |
48 | * | |
49 | * Decoder instance handling. | |
50 | * | |
51 | * @{ | |
52 | */ | |
53 | ||
54 | /** | |
55 | * Set one or more options in a decoder instance. | |
56 | * | |
57 | * Handled options are removed from the hash. | |
58 | * | |
59 | * @param di Decoder instance. | |
60 | * @param options A GHashTable of options to set. | |
61 | * | |
62 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
63 | * | |
64 | * @since 0.1.0 | |
65 | */ | |
66 | SRD_API int srd_inst_option_set(struct srd_decoder_inst *di, | |
67 | GHashTable *options) | |
68 | { | |
69 | struct srd_decoder_option *sdo; | |
70 | PyObject *py_di_options, *py_optval; | |
71 | GVariant *value; | |
72 | GSList *l; | |
73 | double val_double; | |
74 | gint64 val_int; | |
75 | int ret; | |
76 | const char *val_str; | |
77 | PyGILState_STATE gstate; | |
78 | ||
79 | if (!di) { | |
80 | srd_err("Invalid decoder instance."); | |
81 | return SRD_ERR_ARG; | |
82 | } | |
83 | ||
84 | if (!options) { | |
85 | srd_err("Invalid options GHashTable."); | |
86 | return SRD_ERR_ARG; | |
87 | } | |
88 | ||
89 | gstate = PyGILState_Ensure(); | |
90 | ||
91 | if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) { | |
92 | /* Decoder has no options. */ | |
93 | PyGILState_Release(gstate); | |
94 | if (g_hash_table_size(options) == 0) { | |
95 | /* No options provided. */ | |
96 | return SRD_OK; | |
97 | } else { | |
98 | srd_err("Protocol decoder has no options."); | |
99 | return SRD_ERR_ARG; | |
100 | } | |
101 | return SRD_OK; | |
102 | } | |
103 | ||
104 | ret = SRD_ERR_PYTHON; | |
105 | py_optval = NULL; | |
106 | ||
107 | /* | |
108 | * The 'options' tuple is a class variable, but we need to | |
109 | * change it. Changing it directly will affect the entire class, | |
110 | * so we need to create a new object for it, and populate that | |
111 | * instead. | |
112 | */ | |
113 | if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options"))) | |
114 | goto err_out; | |
115 | Py_DECREF(py_di_options); | |
116 | py_di_options = PyDict_New(); | |
117 | PyObject_SetAttrString(di->py_inst, "options", py_di_options); | |
118 | ||
119 | for (l = di->decoder->options; l; l = l->next) { | |
120 | sdo = l->data; | |
121 | if ((value = g_hash_table_lookup(options, sdo->id))) { | |
122 | /* A value was supplied for this option. */ | |
123 | if (!g_variant_type_equal(g_variant_get_type(value), | |
124 | g_variant_get_type(sdo->def))) { | |
125 | srd_err("Option '%s' should have the same type " | |
126 | "as the default value.", sdo->id); | |
127 | goto err_out; | |
128 | } | |
129 | } else { | |
130 | /* Use default for this option. */ | |
131 | value = sdo->def; | |
132 | } | |
133 | if (g_variant_is_of_type(value, G_VARIANT_TYPE_STRING)) { | |
134 | val_str = g_variant_get_string(value, NULL); | |
135 | if (!(py_optval = PyUnicode_FromString(val_str))) { | |
136 | /* Some UTF-8 encoding error. */ | |
137 | PyErr_Clear(); | |
138 | srd_err("Option '%s' requires a UTF-8 string value.", sdo->id); | |
139 | goto err_out; | |
140 | } | |
141 | } else if (g_variant_is_of_type(value, G_VARIANT_TYPE_INT64)) { | |
142 | val_int = g_variant_get_int64(value); | |
143 | if (!(py_optval = PyLong_FromLong(val_int))) { | |
144 | /* ValueError Exception */ | |
145 | PyErr_Clear(); | |
146 | srd_err("Option '%s' has invalid integer value.", sdo->id); | |
147 | goto err_out; | |
148 | } | |
149 | } else if (g_variant_is_of_type(value, G_VARIANT_TYPE_DOUBLE)) { | |
150 | val_double = g_variant_get_double(value); | |
151 | if (!(py_optval = PyFloat_FromDouble(val_double))) { | |
152 | /* ValueError Exception */ | |
153 | PyErr_Clear(); | |
154 | srd_err("Option '%s' has invalid float value.", | |
155 | sdo->id); | |
156 | goto err_out; | |
157 | } | |
158 | } | |
159 | if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1) | |
160 | goto err_out; | |
161 | /* Not harmful even if we used the default. */ | |
162 | g_hash_table_remove(options, sdo->id); | |
163 | } | |
164 | if (g_hash_table_size(options) != 0) | |
165 | srd_warn("Unknown options specified for '%s'", di->inst_id); | |
166 | ||
167 | ret = SRD_OK; | |
168 | ||
169 | err_out: | |
170 | Py_XDECREF(py_optval); | |
171 | if (PyErr_Occurred()) { | |
172 | srd_exception_catch("Stray exception in srd_inst_option_set()"); | |
173 | ret = SRD_ERR_PYTHON; | |
174 | } | |
175 | PyGILState_Release(gstate); | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
180 | /* Helper GComparefunc for g_slist_find_custom() in srd_inst_channel_set_all(). */ | |
181 | static gint compare_channel_id(const struct srd_channel *pdch, | |
182 | const char *channel_id) | |
183 | { | |
184 | return strcmp(pdch->id, channel_id); | |
185 | } | |
186 | ||
187 | /** | |
188 | * Set all channels in a decoder instance. | |
189 | * | |
190 | * This function sets _all_ channels for the specified decoder instance, i.e., | |
191 | * it overwrites any channels that were already defined (if any). | |
192 | * | |
193 | * @param di Decoder instance. | |
194 | * @param new_channels A GHashTable of channels to set. Key is channel name, | |
195 | * value is the channel number. Samples passed to this | |
196 | * instance will be arranged in this order. | |
197 | * | |
198 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
199 | * | |
200 | * @since 0.4.0 | |
201 | */ | |
202 | SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di, | |
203 | GHashTable *new_channels) | |
204 | { | |
205 | GVariant *channel_val; | |
206 | GList *l; | |
207 | GSList *sl; | |
208 | struct srd_channel *pdch; | |
209 | int *new_channelmap, new_channelnum, num_required_channels, i; | |
210 | char *channel_id; | |
211 | ||
212 | srd_dbg("Setting channels for instance %s with list of %d channels.", | |
213 | di->inst_id, g_hash_table_size(new_channels)); | |
214 | ||
215 | if (g_hash_table_size(new_channels) == 0) | |
216 | /* No channels provided. */ | |
217 | return SRD_OK; | |
218 | ||
219 | if (di->dec_num_channels == 0) { | |
220 | /* Decoder has no channels. */ | |
221 | srd_err("Protocol decoder %s has no channels to define.", | |
222 | di->decoder->name); | |
223 | return SRD_ERR_ARG; | |
224 | } | |
225 | ||
226 | new_channelmap = g_malloc0(sizeof(int) * di->dec_num_channels); | |
227 | ||
228 | /* | |
229 | * For now, map all indexes to channel -1 (can be overridden later). | |
230 | * This -1 is interpreted as an unspecified channel later. | |
231 | */ | |
232 | for (i = 0; i < di->dec_num_channels; i++) | |
233 | new_channelmap[i] = -1; | |
234 | ||
235 | for (l = g_hash_table_get_keys(new_channels); l; l = l->next) { | |
236 | channel_id = l->data; | |
237 | channel_val = g_hash_table_lookup(new_channels, channel_id); | |
238 | if (!g_variant_is_of_type(channel_val, G_VARIANT_TYPE_INT32)) { | |
239 | /* Channel name was specified without a value. */ | |
240 | srd_err("No channel number was specified for %s.", | |
241 | channel_id); | |
242 | g_free(new_channelmap); | |
243 | return SRD_ERR_ARG; | |
244 | } | |
245 | new_channelnum = g_variant_get_int32(channel_val); | |
246 | if (!(sl = g_slist_find_custom(di->decoder->channels, channel_id, | |
247 | (GCompareFunc)compare_channel_id))) { | |
248 | /* Fall back on optional channels. */ | |
249 | if (!(sl = g_slist_find_custom(di->decoder->opt_channels, | |
250 | channel_id, (GCompareFunc)compare_channel_id))) { | |
251 | srd_err("Protocol decoder %s has no channel " | |
252 | "'%s'.", di->decoder->name, channel_id); | |
253 | g_free(new_channelmap); | |
254 | return SRD_ERR_ARG; | |
255 | } | |
256 | } | |
257 | pdch = sl->data; | |
258 | new_channelmap[pdch->order] = new_channelnum; | |
259 | srd_dbg("Setting channel mapping: %s (PD ch idx %d) = input data ch idx %d.", | |
260 | pdch->id, pdch->order, new_channelnum); | |
261 | } | |
262 | ||
263 | srd_dbg("Final channel map:"); | |
264 | num_required_channels = g_slist_length(di->decoder->channels); | |
265 | for (i = 0; i < di->dec_num_channels; i++) { | |
266 | GSList *ll = g_slist_nth(di->decoder->channels, i); | |
267 | if (!ll) | |
268 | ll = g_slist_nth(di->decoder->opt_channels, | |
269 | i - num_required_channels); | |
270 | pdch = ll->data; | |
271 | srd_dbg(" - PD ch idx %d (%s) = input data ch idx %d (%s)", i, | |
272 | pdch->id, new_channelmap[i], | |
273 | (i < num_required_channels) ? "required" : "optional"); | |
274 | } | |
275 | ||
276 | /* Report an error if not all required channels were specified. */ | |
277 | for (i = 0; i < num_required_channels; i++) { | |
278 | if (new_channelmap[i] != -1) | |
279 | continue; | |
280 | pdch = g_slist_nth(di->decoder->channels, i)->data; | |
281 | srd_err("Required channel '%s' (index %d) was not specified.", | |
282 | pdch->id, i); | |
283 | g_free(new_channelmap); | |
284 | return SRD_ERR; | |
285 | } | |
286 | ||
287 | g_free(di->dec_channelmap); | |
288 | di->dec_channelmap = new_channelmap; | |
289 | ||
290 | return SRD_OK; | |
291 | } | |
292 | ||
293 | /** | |
294 | * Create a new protocol decoder instance. | |
295 | * | |
296 | * @param sess The session holding the protocol decoder instance. | |
297 | * Must not be NULL. | |
298 | * @param decoder_id Decoder 'id' field. | |
299 | * @param options GHashtable of options which override the defaults set in | |
300 | * the decoder class. May be NULL. | |
301 | * | |
302 | * @return Pointer to a newly allocated struct srd_decoder_inst, or | |
303 | * NULL in case of failure. | |
304 | * | |
305 | * @since 0.3.0 | |
306 | */ | |
307 | SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess, | |
308 | const char *decoder_id, GHashTable *options) | |
309 | { | |
310 | int i; | |
311 | struct srd_decoder *dec; | |
312 | struct srd_decoder_inst *di; | |
313 | char *inst_id; | |
314 | PyGILState_STATE gstate; | |
315 | ||
316 | i = 1; | |
317 | srd_dbg("Creating new %s instance.", decoder_id); | |
318 | ||
319 | if (!sess) | |
320 | return NULL; | |
321 | ||
322 | if (!(dec = srd_decoder_get_by_id(decoder_id))) { | |
323 | srd_err("Protocol decoder %s not found.", decoder_id); | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | di = g_malloc0(sizeof(struct srd_decoder_inst)); | |
328 | ||
329 | di->decoder = dec; | |
330 | di->sess = sess; | |
331 | ||
332 | if (options) { | |
333 | inst_id = g_hash_table_lookup(options, "id"); | |
334 | if (inst_id) | |
335 | di->inst_id = g_strdup(inst_id); | |
336 | g_hash_table_remove(options, "id"); | |
337 | } | |
338 | ||
339 | /* Create a unique instance ID (as none was provided). */ | |
340 | if (!di->inst_id) { | |
341 | di->inst_id = g_strdup_printf("%s-%d", decoder_id, i++); | |
342 | while (srd_inst_find_by_id(sess, di->inst_id)) { | |
343 | g_free(di->inst_id); | |
344 | di->inst_id = g_strdup_printf("%s-%d", decoder_id, i++); | |
345 | } | |
346 | } | |
347 | ||
348 | /* | |
349 | * Prepare a default channel map, where samples come in the | |
350 | * order in which the decoder class defined them. | |
351 | */ | |
352 | di->dec_num_channels = g_slist_length(di->decoder->channels) + | |
353 | g_slist_length(di->decoder->opt_channels); | |
354 | if (di->dec_num_channels) { | |
355 | di->dec_channelmap = | |
356 | g_malloc(sizeof(int) * di->dec_num_channels); | |
357 | for (i = 0; i < di->dec_num_channels; i++) | |
358 | di->dec_channelmap[i] = i; | |
359 | /* | |
360 | * Will be used to prepare a sample at every iteration | |
361 | * of the instance's decode() method. | |
362 | */ | |
363 | di->channel_samples = g_malloc(di->dec_num_channels); | |
364 | } | |
365 | ||
366 | /* Default to the initial pins being the same as in sample 0. */ | |
367 | oldpins_array_seed(di); | |
368 | ||
369 | gstate = PyGILState_Ensure(); | |
370 | ||
371 | /* Create a new instance of this decoder class. */ | |
372 | if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) { | |
373 | if (PyErr_Occurred()) | |
374 | srd_exception_catch("Failed to create %s instance", | |
375 | decoder_id); | |
376 | PyGILState_Release(gstate); | |
377 | g_free(di->dec_channelmap); | |
378 | g_free(di); | |
379 | return NULL; | |
380 | } | |
381 | ||
382 | PyGILState_Release(gstate); | |
383 | ||
384 | if (options && srd_inst_option_set(di, options) != SRD_OK) { | |
385 | g_free(di->dec_channelmap); | |
386 | g_free(di); | |
387 | return NULL; | |
388 | } | |
389 | ||
390 | di->condition_list = NULL; | |
391 | di->match_array = NULL; | |
392 | di->abs_start_samplenum = 0; | |
393 | di->abs_end_samplenum = 0; | |
394 | di->inbuf = NULL; | |
395 | di->inbuflen = 0; | |
396 | di->abs_cur_samplenum = 0; | |
397 | di->thread_handle = NULL; | |
398 | di->got_new_samples = FALSE; | |
399 | di->handled_all_samples = FALSE; | |
400 | di->want_wait_terminate = FALSE; | |
401 | di->decoder_state = SRD_OK; | |
402 | ||
403 | /* | |
404 | * Strictly speaking initialization of statically allocated | |
405 | * condition and mutex variables (or variables allocated on the | |
406 | * stack) is not required, but won't harm either. Explicitly | |
407 | * running init() will better match subsequent clear() calls. | |
408 | */ | |
409 | g_cond_init(&di->got_new_samples_cond); | |
410 | g_cond_init(&di->handled_all_samples_cond); | |
411 | g_mutex_init(&di->data_mutex); | |
412 | ||
413 | /* Instance takes input from a frontend by default. */ | |
414 | sess->di_list = g_slist_append(sess->di_list, di); | |
415 | srd_dbg("Created new %s instance with ID %s.", decoder_id, di->inst_id); | |
416 | ||
417 | return di; | |
418 | } | |
419 | ||
420 | static void srd_inst_join_decode_thread(struct srd_decoder_inst *di) | |
421 | { | |
422 | if (!di) | |
423 | return; | |
424 | if (!di->thread_handle) | |
425 | return; | |
426 | ||
427 | srd_dbg("%s: Joining decoder thread.", di->inst_id); | |
428 | ||
429 | /* | |
430 | * Terminate potentially running threads which still | |
431 | * execute the decoder instance's decode() method. | |
432 | */ | |
433 | srd_dbg("%s: Raising want_term, sending got_new.", di->inst_id); | |
434 | g_mutex_lock(&di->data_mutex); | |
435 | di->want_wait_terminate = TRUE; | |
436 | g_cond_signal(&di->got_new_samples_cond); | |
437 | g_mutex_unlock(&di->data_mutex); | |
438 | ||
439 | srd_dbg("%s: Running join().", di->inst_id); | |
440 | (void)g_thread_join(di->thread_handle); | |
441 | srd_dbg("%s: Call to join() done.", di->inst_id); | |
442 | di->thread_handle = NULL; | |
443 | ||
444 | /* | |
445 | * Reset condition and mutex variables, such that next | |
446 | * operations on them will find them in a clean state. | |
447 | */ | |
448 | g_cond_clear(&di->got_new_samples_cond); | |
449 | g_cond_init(&di->got_new_samples_cond); | |
450 | g_cond_clear(&di->handled_all_samples_cond); | |
451 | g_cond_init(&di->handled_all_samples_cond); | |
452 | g_mutex_clear(&di->data_mutex); | |
453 | g_mutex_init(&di->data_mutex); | |
454 | } | |
455 | ||
456 | static void srd_inst_reset_state(struct srd_decoder_inst *di) | |
457 | { | |
458 | if (!di) | |
459 | return; | |
460 | ||
461 | srd_dbg("%s: Resetting decoder state.", di->inst_id); | |
462 | ||
463 | /* Reset internal state of the decoder. */ | |
464 | condition_list_free(di); | |
465 | match_array_free(di); | |
466 | di->abs_start_samplenum = 0; | |
467 | di->abs_end_samplenum = 0; | |
468 | di->inbuf = NULL; | |
469 | di->inbuflen = 0; | |
470 | di->abs_cur_samplenum = 0; | |
471 | oldpins_array_free(di); | |
472 | di->got_new_samples = FALSE; | |
473 | di->handled_all_samples = FALSE; | |
474 | di->want_wait_terminate = FALSE; | |
475 | di->decoder_state = SRD_OK; | |
476 | /* Conditions and mutex got reset after joining the thread. */ | |
477 | } | |
478 | ||
479 | /** | |
480 | * Stack a decoder instance on top of another. | |
481 | * | |
482 | * @param sess The session holding the protocol decoder instances. | |
483 | * Must not be NULL. | |
484 | * @param di_bottom The instance on top of which di_top will be stacked. | |
485 | * @param di_top The instance to go on top. | |
486 | * | |
487 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
488 | * | |
489 | * @since 0.3.0 | |
490 | */ | |
491 | SRD_API int srd_inst_stack(struct srd_session *sess, | |
492 | struct srd_decoder_inst *di_bottom, | |
493 | struct srd_decoder_inst *di_top) | |
494 | { | |
495 | if (!sess) | |
496 | return SRD_ERR_ARG; | |
497 | ||
498 | if (!di_bottom || !di_top) { | |
499 | srd_err("Invalid from/to instance pair."); | |
500 | return SRD_ERR_ARG; | |
501 | } | |
502 | ||
503 | if (g_slist_find(sess->di_list, di_top)) { | |
504 | /* Remove from the unstacked list. */ | |
505 | sess->di_list = g_slist_remove(sess->di_list, di_top); | |
506 | } | |
507 | ||
508 | /* Stack on top of source di. */ | |
509 | di_bottom->next_di = g_slist_append(di_bottom->next_di, di_top); | |
510 | ||
511 | srd_dbg("Stacked %s onto %s.", di_top->inst_id, di_bottom->inst_id); | |
512 | ||
513 | return SRD_OK; | |
514 | } | |
515 | ||
516 | /** | |
517 | * Search a decoder instance and its stack for instance ID. | |
518 | * | |
519 | * @param[in] inst_id ID to search for. | |
520 | * @param[in] stack A decoder instance, potentially with stacked instances. | |
521 | * | |
522 | * @return The matching instance, or NULL. | |
523 | */ | |
524 | static struct srd_decoder_inst *srd_inst_find_by_id_stack(const char *inst_id, | |
525 | struct srd_decoder_inst *stack) | |
526 | { | |
527 | const GSList *l; | |
528 | struct srd_decoder_inst *tmp, *di; | |
529 | ||
530 | if (!strcmp(stack->inst_id, inst_id)) | |
531 | return stack; | |
532 | ||
533 | /* Otherwise, look recursively in our stack. */ | |
534 | di = NULL; | |
535 | if (stack->next_di) { | |
536 | for (l = stack->next_di; l; l = l->next) { | |
537 | tmp = l->data; | |
538 | if (!strcmp(tmp->inst_id, inst_id)) { | |
539 | di = tmp; | |
540 | break; | |
541 | } | |
542 | } | |
543 | } | |
544 | ||
545 | return di; | |
546 | } | |
547 | ||
548 | /** | |
549 | * Find a decoder instance by its instance ID. | |
550 | * | |
551 | * This will recurse to find the instance anywhere in the stack tree of the | |
552 | * given session. | |
553 | * | |
554 | * @param sess The session holding the protocol decoder instance. | |
555 | * Must not be NULL. | |
556 | * @param inst_id The instance ID to be found. | |
557 | * | |
558 | * @return Pointer to struct srd_decoder_inst, or NULL if not found. | |
559 | * | |
560 | * @since 0.3.0 | |
561 | */ | |
562 | SRD_API struct srd_decoder_inst *srd_inst_find_by_id(struct srd_session *sess, | |
563 | const char *inst_id) | |
564 | { | |
565 | GSList *l; | |
566 | struct srd_decoder_inst *tmp, *di; | |
567 | ||
568 | if (!sess) | |
569 | return NULL; | |
570 | ||
571 | di = NULL; | |
572 | for (l = sess->di_list; l; l = l->next) { | |
573 | tmp = l->data; | |
574 | if ((di = srd_inst_find_by_id_stack(inst_id, tmp)) != NULL) | |
575 | break; | |
576 | } | |
577 | ||
578 | return di; | |
579 | } | |
580 | ||
581 | /** | |
582 | * Set the list of initial (assumed) pin values. | |
583 | * | |
584 | * @param di Decoder instance to use. Must not be NULL. | |
585 | * @param initial_pins A GArray of uint8_t values. Must not be NULL. | |
586 | * | |
587 | * @since 0.5.0 | |
588 | */ | |
589 | SRD_API int srd_inst_initial_pins_set_all(struct srd_decoder_inst *di, GArray *initial_pins) | |
590 | { | |
591 | int i; | |
592 | GString *s; | |
593 | ||
594 | if (!di) { | |
595 | srd_err("Invalid decoder instance."); | |
596 | return SRD_ERR_ARG; | |
597 | } | |
598 | ||
599 | if (!initial_pins) | |
600 | return SRD_ERR_ARG; | |
601 | ||
602 | if (initial_pins->len != (guint)di->dec_num_channels) { | |
603 | srd_err("Incorrect number of channels (need %d, got %d).", | |
604 | di->dec_num_channels, initial_pins->len); | |
605 | return SRD_ERR_ARG; | |
606 | } | |
607 | ||
608 | /* Sanity-check initial pin state values. */ | |
609 | for (i = 0; i < di->dec_num_channels; i++) { | |
610 | if (initial_pins->data[i] <= 2) | |
611 | continue; | |
612 | srd_err("Invalid initial channel %d pin state: %d.", | |
613 | i, initial_pins->data[i]); | |
614 | return SRD_ERR_ARG; | |
615 | } | |
616 | ||
617 | s = g_string_sized_new(100); | |
618 | oldpins_array_seed(di); | |
619 | for (i = 0; i < di->dec_num_channels; i++) { | |
620 | di->old_pins_array->data[i] = initial_pins->data[i]; | |
621 | g_string_append_printf(s, "%d, ", di->old_pins_array->data[i]); | |
622 | } | |
623 | s = g_string_truncate(s, s->len - 2); | |
624 | srd_dbg("Initial pins: %s.", s->str); | |
625 | g_string_free(s, TRUE); | |
626 | ||
627 | return SRD_OK; | |
628 | } | |
629 | ||
630 | /** @private */ | |
631 | SRD_PRIV void oldpins_array_seed(struct srd_decoder_inst *di) | |
632 | { | |
633 | size_t count; | |
634 | GArray *arr; | |
635 | ||
636 | if (!di) | |
637 | return; | |
638 | if (di->old_pins_array) | |
639 | return; | |
640 | ||
641 | srd_dbg("%s: Seeding old pins, %s().", di->inst_id, __func__); | |
642 | count = di->dec_num_channels; | |
643 | arr = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t), count); | |
644 | g_array_set_size(arr, count); | |
645 | memset(arr->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0, count); | |
646 | di->old_pins_array = arr; | |
647 | } | |
648 | ||
649 | /** @private */ | |
650 | SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di) | |
651 | { | |
652 | if (!di) | |
653 | return; | |
654 | if (!di->old_pins_array) | |
655 | return; | |
656 | ||
657 | srd_dbg("%s: Releasing initial pin state.", di->inst_id); | |
658 | ||
659 | g_array_free(di->old_pins_array, TRUE); | |
660 | di->old_pins_array = NULL; | |
661 | } | |
662 | ||
663 | /** @private */ | |
664 | SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di) | |
665 | { | |
666 | PyObject *py_res; | |
667 | GSList *l; | |
668 | struct srd_decoder_inst *next_di; | |
669 | int ret; | |
670 | PyGILState_STATE gstate; | |
671 | ||
672 | srd_dbg("Calling start() method on protocol decoder instance %s.", | |
673 | di->inst_id); | |
674 | ||
675 | gstate = PyGILState_Ensure(); | |
676 | ||
677 | /* Run self.start(). */ | |
678 | if (!(py_res = PyObject_CallMethod(di->py_inst, "start", NULL))) { | |
679 | srd_exception_catch("Protocol decoder instance %s", | |
680 | di->inst_id); | |
681 | PyGILState_Release(gstate); | |
682 | return SRD_ERR_PYTHON; | |
683 | } | |
684 | Py_DecRef(py_res); | |
685 | ||
686 | /* Set self.samplenum to 0. */ | |
687 | PyObject_SetAttrString(di->py_inst, "samplenum", PyLong_FromLong(0)); | |
688 | ||
689 | /* Set self.matched to None. */ | |
690 | PyObject_SetAttrString(di->py_inst, "matched", Py_None); | |
691 | ||
692 | PyGILState_Release(gstate); | |
693 | ||
694 | /* Start all the PDs stacked on top of this one. */ | |
695 | for (l = di->next_di; l; l = l->next) { | |
696 | next_di = l->data; | |
697 | if ((ret = srd_inst_start(next_di)) != SRD_OK) | |
698 | return ret; | |
699 | } | |
700 | ||
701 | return SRD_OK; | |
702 | } | |
703 | ||
704 | /** | |
705 | * Check whether the specified sample matches the specified term. | |
706 | * | |
707 | * In the case of SRD_TERM_SKIP, this function can modify | |
708 | * term->num_samples_already_skipped. | |
709 | * | |
710 | * @param old_sample The value of the previous sample (0/1). | |
711 | * @param sample The value of the current sample (0/1). | |
712 | * @param term The term that should be checked for a match. Must not be NULL. | |
713 | * | |
714 | * @retval TRUE The current sample matches the specified term. | |
715 | * @retval FALSE The current sample doesn't match the specified term, or an | |
716 | * invalid term was provided. | |
717 | * | |
718 | * @private | |
719 | */ | |
720 | __attribute__((always_inline)) | |
721 | static inline gboolean sample_matches(uint8_t old_sample, uint8_t sample, struct srd_term *term) | |
722 | { | |
723 | /* Caller ensures term != NULL. */ | |
724 | ||
725 | switch (term->type) { | |
726 | case SRD_TERM_HIGH: | |
727 | if (sample == 1) | |
728 | return TRUE; | |
729 | break; | |
730 | case SRD_TERM_LOW: | |
731 | if (sample == 0) | |
732 | return TRUE; | |
733 | break; | |
734 | case SRD_TERM_RISING_EDGE: | |
735 | if (old_sample == 0 && sample == 1) | |
736 | return TRUE; | |
737 | break; | |
738 | case SRD_TERM_FALLING_EDGE: | |
739 | if (old_sample == 1 && sample == 0) | |
740 | return TRUE; | |
741 | break; | |
742 | case SRD_TERM_EITHER_EDGE: | |
743 | if ((old_sample == 1 && sample == 0) || (old_sample == 0 && sample == 1)) | |
744 | return TRUE; | |
745 | break; | |
746 | case SRD_TERM_NO_EDGE: | |
747 | if ((old_sample == 0 && sample == 0) || (old_sample == 1 && sample == 1)) | |
748 | return TRUE; | |
749 | break; | |
750 | case SRD_TERM_SKIP: | |
751 | if (term->num_samples_already_skipped == term->num_samples_to_skip) | |
752 | return TRUE; | |
753 | term->num_samples_already_skipped++; | |
754 | break; | |
755 | default: | |
756 | srd_err("Unknown term type %d.", term->type); | |
757 | break; | |
758 | } | |
759 | ||
760 | return FALSE; | |
761 | } | |
762 | ||
763 | /** @private */ | |
764 | SRD_PRIV void match_array_free(struct srd_decoder_inst *di) | |
765 | { | |
766 | if (!di || !di->match_array) | |
767 | return; | |
768 | ||
769 | g_array_free(di->match_array, TRUE); | |
770 | di->match_array = NULL; | |
771 | } | |
772 | ||
773 | /** @private */ | |
774 | SRD_PRIV void condition_list_free(struct srd_decoder_inst *di) | |
775 | { | |
776 | GSList *l, *ll; | |
777 | ||
778 | if (!di) | |
779 | return; | |
780 | ||
781 | for (l = di->condition_list; l; l = l->next) { | |
782 | ll = l->data; | |
783 | if (ll) | |
784 | g_slist_free_full(ll, g_free); | |
785 | } | |
786 | ||
787 | di->condition_list = NULL; | |
788 | } | |
789 | ||
790 | static gboolean have_non_null_conds(const struct srd_decoder_inst *di) | |
791 | { | |
792 | GSList *l, *cond; | |
793 | ||
794 | if (!di) | |
795 | return FALSE; | |
796 | ||
797 | for (l = di->condition_list; l; l = l->next) { | |
798 | cond = l->data; | |
799 | if (cond) | |
800 | return TRUE; | |
801 | } | |
802 | ||
803 | return FALSE; | |
804 | } | |
805 | ||
806 | static void update_old_pins_array(struct srd_decoder_inst *di, | |
807 | const uint8_t *sample_pos) | |
808 | { | |
809 | uint8_t sample; | |
810 | int i, byte_offset, bit_offset; | |
811 | ||
812 | if (!di || !di->dec_channelmap || !sample_pos) | |
813 | return; | |
814 | ||
815 | oldpins_array_seed(di); | |
816 | for (i = 0; i < di->dec_num_channels; i++) { | |
817 | byte_offset = di->dec_channelmap[i] / 8; | |
818 | bit_offset = di->dec_channelmap[i] % 8; | |
819 | sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0; | |
820 | di->old_pins_array->data[i] = sample; | |
821 | } | |
822 | } | |
823 | ||
824 | static void update_old_pins_array_initial_pins(struct srd_decoder_inst *di) | |
825 | { | |
826 | uint8_t sample; | |
827 | int i, byte_offset, bit_offset; | |
828 | const uint8_t *sample_pos; | |
829 | ||
830 | if (!di || !di->dec_channelmap) | |
831 | return; | |
832 | ||
833 | sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize); | |
834 | ||
835 | oldpins_array_seed(di); | |
836 | for (i = 0; i < di->dec_num_channels; i++) { | |
837 | if (di->old_pins_array->data[i] != SRD_INITIAL_PIN_SAME_AS_SAMPLE0) | |
838 | continue; | |
839 | byte_offset = di->dec_channelmap[i] / 8; | |
840 | bit_offset = di->dec_channelmap[i] % 8; | |
841 | sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0; | |
842 | di->old_pins_array->data[i] = sample; | |
843 | } | |
844 | } | |
845 | ||
846 | static gboolean term_matches(const struct srd_decoder_inst *di, | |
847 | struct srd_term *term, const uint8_t *sample_pos) | |
848 | { | |
849 | uint8_t old_sample, sample; | |
850 | int byte_offset, bit_offset, ch; | |
851 | ||
852 | /* Caller ensures di, di->dec_channelmap, term, sample_pos != NULL. */ | |
853 | ||
854 | if (term->type == SRD_TERM_SKIP) | |
855 | return sample_matches(0, 0, term); | |
856 | ||
857 | ch = term->channel; | |
858 | byte_offset = di->dec_channelmap[ch] / 8; | |
859 | bit_offset = di->dec_channelmap[ch] % 8; | |
860 | sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0; | |
861 | old_sample = di->old_pins_array->data[ch]; | |
862 | ||
863 | return sample_matches(old_sample, sample, term); | |
864 | } | |
865 | ||
866 | static gboolean all_terms_match(const struct srd_decoder_inst *di, | |
867 | const GSList *cond, const uint8_t *sample_pos) | |
868 | { | |
869 | const GSList *l; | |
870 | struct srd_term *term; | |
871 | ||
872 | /* Caller ensures di, cond, sample_pos != NULL. */ | |
873 | ||
874 | for (l = cond; l; l = l->next) { | |
875 | term = l->data; | |
876 | if (!term_matches(di, term, sample_pos)) | |
877 | return FALSE; | |
878 | } | |
879 | ||
880 | return TRUE; | |
881 | } | |
882 | ||
883 | static gboolean at_least_one_condition_matched( | |
884 | const struct srd_decoder_inst *di, unsigned int num_conditions) | |
885 | { | |
886 | unsigned int i; | |
887 | ||
888 | /* Caller ensures di != NULL. */ | |
889 | ||
890 | for (i = 0; i < num_conditions; i++) { | |
891 | if (di->match_array->data[i]) | |
892 | return TRUE; | |
893 | } | |
894 | ||
895 | return FALSE; | |
896 | } | |
897 | ||
898 | static gboolean find_match(struct srd_decoder_inst *di) | |
899 | { | |
900 | uint64_t i, j, num_samples_to_process; | |
901 | GSList *l, *cond; | |
902 | const uint8_t *sample_pos; | |
903 | unsigned int num_conditions; | |
904 | ||
905 | /* Caller ensures di != NULL. */ | |
906 | ||
907 | /* Check whether the condition list is NULL/empty. */ | |
908 | if (!di->condition_list) { | |
909 | srd_dbg("NULL/empty condition list, automatic match."); | |
910 | return TRUE; | |
911 | } | |
912 | ||
913 | /* Check whether we have any non-NULL conditions. */ | |
914 | if (!have_non_null_conds(di)) { | |
915 | srd_dbg("Only NULL conditions in list, automatic match."); | |
916 | return TRUE; | |
917 | } | |
918 | ||
919 | num_samples_to_process = di->abs_end_samplenum - di->abs_cur_samplenum; | |
920 | num_conditions = g_slist_length(di->condition_list); | |
921 | ||
922 | /* di->match_array is NULL here. Create a new GArray. */ | |
923 | di->match_array = g_array_sized_new(FALSE, TRUE, sizeof(gboolean), num_conditions); | |
924 | g_array_set_size(di->match_array, num_conditions); | |
925 | ||
926 | /* Sample 0: Set di->old_pins_array for SRD_INITIAL_PIN_SAME_AS_SAMPLE0 pins. */ | |
927 | if (di->abs_cur_samplenum == 0) | |
928 | update_old_pins_array_initial_pins(di); | |
929 | ||
930 | for (i = 0; i < num_samples_to_process; i++, (di->abs_cur_samplenum)++) { | |
931 | ||
932 | sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize); | |
933 | ||
934 | /* Check whether the current sample matches at least one of the conditions (logical OR). */ | |
935 | /* IMPORTANT: We need to check all conditions, even if there was a match already! */ | |
936 | for (l = di->condition_list, j = 0; l; l = l->next, j++) { | |
937 | cond = l->data; | |
938 | if (!cond) | |
939 | continue; | |
940 | /* All terms in 'cond' must match (logical AND). */ | |
941 | di->match_array->data[j] = all_terms_match(di, cond, sample_pos); | |
942 | } | |
943 | ||
944 | update_old_pins_array(di, sample_pos); | |
945 | ||
946 | /* If at least one condition matched we're done. */ | |
947 | if (at_least_one_condition_matched(di, num_conditions)) | |
948 | return TRUE; | |
949 | } | |
950 | ||
951 | return FALSE; | |
952 | } | |
953 | ||
954 | /** | |
955 | * Process available samples and check if they match the defined conditions. | |
956 | * | |
957 | * This function returns if there is an error, or when a match is found, or | |
958 | * when all samples have been processed (whether a match was found or not). | |
959 | * This function immediately terminates when the decoder's wait() method | |
960 | * invocation shall get terminated. | |
961 | * | |
962 | * @param di The decoder instance to use. Must not be NULL. | |
963 | * @param found_match Will be set to TRUE if at least one condition matched, | |
964 | * FALSE otherwise. Must not be NULL. | |
965 | * | |
966 | * @retval SRD_OK No errors occured, see found_match for the result. | |
967 | * @retval SRD_ERR_ARG Invalid arguments. | |
968 | * | |
969 | * @private | |
970 | */ | |
971 | SRD_PRIV int process_samples_until_condition_match(struct srd_decoder_inst *di, gboolean *found_match) | |
972 | { | |
973 | if (!di || !found_match) | |
974 | return SRD_ERR_ARG; | |
975 | ||
976 | *found_match = FALSE; | |
977 | if (di->want_wait_terminate) | |
978 | return SRD_OK; | |
979 | ||
980 | /* Check if any of the current condition(s) match. */ | |
981 | while (TRUE) { | |
982 | /* Feed the (next chunk of the) buffer to find_match(). */ | |
983 | *found_match = find_match(di); | |
984 | ||
985 | /* Did we handle all samples yet? */ | |
986 | if (di->abs_cur_samplenum >= di->abs_end_samplenum) { | |
987 | srd_dbg("Done, handled all samples (abs cur %" PRIu64 | |
988 | " / abs end %" PRIu64 ").", | |
989 | di->abs_cur_samplenum, di->abs_end_samplenum); | |
990 | return SRD_OK; | |
991 | } | |
992 | ||
993 | /* If we didn't find a match, continue looking. */ | |
994 | if (!(*found_match)) | |
995 | continue; | |
996 | ||
997 | /* At least one condition matched, return. */ | |
998 | return SRD_OK; | |
999 | } | |
1000 | ||
1001 | return SRD_OK; | |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * Worker thread (per PD-stack). | |
1006 | * | |
1007 | * @param data Pointer to the lowest-level PD's device instance. | |
1008 | * Must not be NULL. | |
1009 | * | |
1010 | * @return NULL if there was an error. | |
1011 | */ | |
1012 | static gpointer di_thread(gpointer data) | |
1013 | { | |
1014 | PyObject *py_res; | |
1015 | struct srd_decoder_inst *di; | |
1016 | int wanted_term; | |
1017 | PyGILState_STATE gstate; | |
1018 | ||
1019 | if (!data) | |
1020 | return NULL; | |
1021 | ||
1022 | di = data; | |
1023 | ||
1024 | srd_dbg("%s: Starting thread routine for decoder.", di->inst_id); | |
1025 | ||
1026 | gstate = PyGILState_Ensure(); | |
1027 | ||
1028 | /* | |
1029 | * Call self.decode(). Only returns if the PD throws an exception. | |
1030 | * "Regular" termination of the decode() method is not expected. | |
1031 | */ | |
1032 | Py_IncRef(di->py_inst); | |
1033 | srd_dbg("%s: Calling decode() method.", di->inst_id); | |
1034 | py_res = PyObject_CallMethod(di->py_inst, "decode", NULL); | |
1035 | srd_dbg("%s: decode() method terminated.", di->inst_id); | |
1036 | ||
1037 | if (!py_res) | |
1038 | di->decoder_state = SRD_ERR; | |
1039 | ||
1040 | /* | |
1041 | * Make sure to unblock potentially pending srd_inst_decode() | |
1042 | * calls in application threads after the decode() method might | |
1043 | * have terminated, while it neither has processed sample data | |
1044 | * nor has terminated upon request. This happens e.g. when "need | |
1045 | * a samplerate to decode" exception is thrown. | |
1046 | */ | |
1047 | g_mutex_lock(&di->data_mutex); | |
1048 | wanted_term = di->want_wait_terminate; | |
1049 | di->want_wait_terminate = TRUE; | |
1050 | di->handled_all_samples = TRUE; | |
1051 | g_cond_signal(&di->handled_all_samples_cond); | |
1052 | g_mutex_unlock(&di->data_mutex); | |
1053 | ||
1054 | /* | |
1055 | * Check for the termination cause of the decode() method. | |
1056 | * Though this is mostly for information. | |
1057 | */ | |
1058 | if (!py_res && wanted_term) { | |
1059 | /* | |
1060 | * Silently ignore errors upon return from decode() calls | |
1061 | * when termination was requested. Terminate the thread | |
1062 | * which executed this instance's decode() logic. | |
1063 | */ | |
1064 | srd_dbg("%s: Thread done (!res, want_term).", di->inst_id); | |
1065 | PyErr_Clear(); | |
1066 | PyGILState_Release(gstate); | |
1067 | return NULL; | |
1068 | } | |
1069 | if (!py_res) { | |
1070 | /* | |
1071 | * The decode() invocation terminated unexpectedly. Have | |
1072 | * the back trace printed, and terminate the thread which | |
1073 | * executed the decode() method. | |
1074 | */ | |
1075 | srd_dbg("%s: decode() terminated unrequested.", di->inst_id); | |
1076 | srd_exception_catch("Protocol decoder instance %s: ", di->inst_id); | |
1077 | srd_dbg("%s: Thread done (!res, !want_term).", di->inst_id); | |
1078 | PyGILState_Release(gstate); | |
1079 | return NULL; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * TODO: By design the decode() method is not supposed to terminate. | |
1084 | * Nevertheless we have the thread joined, and srd backend calls to | |
1085 | * decode() will re-start another thread transparently. | |
1086 | */ | |
1087 | srd_dbg("%s: decode() terminated (req %d).", di->inst_id, wanted_term); | |
1088 | Py_DecRef(py_res); | |
1089 | PyErr_Clear(); | |
1090 | ||
1091 | PyGILState_Release(gstate); | |
1092 | ||
1093 | srd_dbg("%s: Thread done (with res).", di->inst_id); | |
1094 | ||
1095 | return NULL; | |
1096 | } | |
1097 | ||
1098 | /** | |
1099 | * Decode a chunk of samples. | |
1100 | * | |
1101 | * The calls to this function must provide the samples that shall be | |
1102 | * used by the protocol decoder | |
1103 | * - in the correct order ([...]5, 6, 4, 7, 8[...] is a bug), | |
1104 | * - starting from sample zero (2, 3, 4, 5, 6[...] is a bug), | |
1105 | * - consecutively, with no gaps (0, 1, 2, 4, 5[...] is a bug). | |
1106 | * | |
1107 | * The start- and end-sample numbers are absolute sample numbers (relative | |
1108 | * to the start of the whole capture/file/stream), i.e. they are not relative | |
1109 | * sample numbers within the chunk specified by 'inbuf' and 'inbuflen'. | |
1110 | * | |
1111 | * Correct example (4096 samples total, 4 chunks @ 1024 samples each): | |
1112 | * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1); | |
1113 | * srd_inst_decode(di, 1024, 2048, inbuf, 1024, 1); | |
1114 | * srd_inst_decode(di, 2048, 3072, inbuf, 1024, 1); | |
1115 | * srd_inst_decode(di, 3072, 4096, inbuf, 1024, 1); | |
1116 | * | |
1117 | * The chunk size ('inbuflen') can be arbitrary and can differ between calls. | |
1118 | * | |
1119 | * Correct example (4096 samples total, 7 chunks @ various samples each): | |
1120 | * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1); | |
1121 | * srd_inst_decode(di, 1024, 1124, inbuf, 100, 1); | |
1122 | * srd_inst_decode(di, 1124, 1424, inbuf, 300, 1); | |
1123 | * srd_inst_decode(di, 1424, 1643, inbuf, 219, 1); | |
1124 | * srd_inst_decode(di, 1643, 2048, inbuf, 405, 1); | |
1125 | * srd_inst_decode(di, 2048, 3072, inbuf, 1024, 1); | |
1126 | * srd_inst_decode(di, 3072, 4096, inbuf, 1024, 1); | |
1127 | * | |
1128 | * INCORRECT example (4096 samples total, 4 chunks @ 1024 samples each, but | |
1129 | * the start- and end-samplenumbers are not absolute): | |
1130 | * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1); | |
1131 | * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1); | |
1132 | * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1); | |
1133 | * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1); | |
1134 | * | |
1135 | * @param di The decoder instance to call. Must not be NULL. | |
1136 | * @param abs_start_samplenum The absolute starting sample number for the | |
1137 | * buffer's sample set, relative to the start of capture. | |
1138 | * @param abs_end_samplenum The absolute ending sample number for the | |
1139 | * buffer's sample set, relative to the start of capture. | |
1140 | * @param inbuf The buffer to decode. Must not be NULL. | |
1141 | * @param inbuflen Length of the buffer. Must be > 0. | |
1142 | * @param unitsize The number of bytes per sample. Must be > 0. | |
1143 | * | |
1144 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
1145 | * | |
1146 | * @private | |
1147 | */ | |
1148 | SRD_PRIV int srd_inst_decode(struct srd_decoder_inst *di, | |
1149 | uint64_t abs_start_samplenum, uint64_t abs_end_samplenum, | |
1150 | const uint8_t *inbuf, uint64_t inbuflen, uint64_t unitsize) | |
1151 | { | |
1152 | /* Return an error upon unusable input. */ | |
1153 | if (!di) { | |
1154 | srd_dbg("empty decoder instance"); | |
1155 | return SRD_ERR_ARG; | |
1156 | } | |
1157 | if (!inbuf) { | |
1158 | srd_dbg("NULL buffer pointer"); | |
1159 | return SRD_ERR_ARG; | |
1160 | } | |
1161 | if (inbuflen == 0) { | |
1162 | srd_dbg("empty buffer"); | |
1163 | return SRD_ERR_ARG; | |
1164 | } | |
1165 | if (unitsize == 0) { | |
1166 | srd_dbg("unitsize 0"); | |
1167 | return SRD_ERR_ARG; | |
1168 | } | |
1169 | ||
1170 | if (abs_start_samplenum != di->abs_cur_samplenum || | |
1171 | abs_end_samplenum < abs_start_samplenum) { | |
1172 | srd_dbg("Incorrect sample numbers: start=%" PRIu64 ", cur=%" | |
1173 | PRIu64 ", end=%" PRIu64 ".", abs_start_samplenum, | |
1174 | di->abs_cur_samplenum, abs_end_samplenum); | |
1175 | return SRD_ERR_ARG; | |
1176 | } | |
1177 | ||
1178 | di->data_unitsize = unitsize; | |
1179 | ||
1180 | srd_dbg("Decoding: abs start sample %" PRIu64 ", abs end sample %" | |
1181 | PRIu64 " (%" PRIu64 " samples, %" PRIu64 " bytes, unitsize = " | |
1182 | "%d), instance %s.", abs_start_samplenum, abs_end_samplenum, | |
1183 | abs_end_samplenum - abs_start_samplenum, inbuflen, di->data_unitsize, | |
1184 | di->inst_id); | |
1185 | ||
1186 | /* If this is the first call, start the worker thread. */ | |
1187 | if (!di->thread_handle) { | |
1188 | srd_dbg("No worker thread for this decoder stack " | |
1189 | "exists yet, creating one: %s.", di->inst_id); | |
1190 | di->thread_handle = g_thread_new(di->inst_id, | |
1191 | di_thread, di); | |
1192 | } | |
1193 | ||
1194 | /* Push the new sample chunk to the worker thread. */ | |
1195 | g_mutex_lock(&di->data_mutex); | |
1196 | di->abs_start_samplenum = abs_start_samplenum; | |
1197 | di->abs_end_samplenum = abs_end_samplenum; | |
1198 | di->inbuf = inbuf; | |
1199 | di->inbuflen = inbuflen; | |
1200 | di->got_new_samples = TRUE; | |
1201 | di->handled_all_samples = FALSE; | |
1202 | ||
1203 | /* Signal the thread that we have new data. */ | |
1204 | g_cond_signal(&di->got_new_samples_cond); | |
1205 | g_mutex_unlock(&di->data_mutex); | |
1206 | ||
1207 | /* When all samples in this chunk were handled, return. */ | |
1208 | g_mutex_lock(&di->data_mutex); | |
1209 | while (!di->handled_all_samples && !di->want_wait_terminate) | |
1210 | g_cond_wait(&di->handled_all_samples_cond, &di->data_mutex); | |
1211 | g_mutex_unlock(&di->data_mutex); | |
1212 | ||
1213 | if (di->want_wait_terminate) | |
1214 | return SRD_ERR_TERM_REQ; | |
1215 | ||
1216 | return SRD_OK; | |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * Terminate current decoder work, prepare for re-use on new input data. | |
1221 | * | |
1222 | * Terminates all decoder operations in the specified decoder instance | |
1223 | * and the instances stacked on top of it. Resets internal state such | |
1224 | * that the previously constructed stack can process new input data that | |
1225 | * is not related to previously processed input data. This avoids the | |
1226 | * expensive and complex re-construction of decoder stacks. | |
1227 | * | |
1228 | * Callers are expected to follow up with start, metadata, and decode | |
1229 | * calls like they would for newly constructed decoder stacks. | |
1230 | * | |
1231 | * @param di The decoder instance to call. Must not be NULL. | |
1232 | * | |
1233 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
1234 | * | |
1235 | * @private | |
1236 | */ | |
1237 | SRD_PRIV int srd_inst_terminate_reset(struct srd_decoder_inst *di) | |
1238 | { | |
1239 | PyGILState_STATE gstate; | |
1240 | PyObject *py_ret; | |
1241 | GSList *l; | |
1242 | int ret; | |
1243 | ||
1244 | if (!di) | |
1245 | return SRD_ERR_ARG; | |
1246 | ||
1247 | /* | |
1248 | * Request termination and wait for previously initiated | |
1249 | * background operation to finish. Reset internal state, but | |
1250 | * do not start releasing resources yet. This shall result in | |
1251 | * decoders' state just like after creation. This block handles | |
1252 | * the C language library side. | |
1253 | */ | |
1254 | srd_dbg("Terminating instance %s", di->inst_id); | |
1255 | srd_inst_join_decode_thread(di); | |
1256 | srd_inst_reset_state(di); | |
1257 | ||
1258 | /* | |
1259 | * Have the Python side's .reset() method executed (if the PD | |
1260 | * implements it). It's assumed that .reset() assigns variables | |
1261 | * very much like __init__() used to do in the past. Thus memory | |
1262 | * that was allocated in previous calls gets released by Python | |
1263 | * as it's not referenced any longer. | |
1264 | */ | |
1265 | gstate = PyGILState_Ensure(); | |
1266 | if (PyObject_HasAttrString(di->py_inst, "reset")) { | |
1267 | srd_dbg("Calling .reset() of instance %s", di->inst_id); | |
1268 | py_ret = PyObject_CallMethod(di->py_inst, "reset", NULL); | |
1269 | Py_XDECREF(py_ret); | |
1270 | } | |
1271 | PyGILState_Release(gstate); | |
1272 | ||
1273 | /* Pass the "restart" request to all stacked decoders. */ | |
1274 | for (l = di->next_di; l; l = l->next) { | |
1275 | ret = srd_inst_terminate_reset(l->data); | |
1276 | if (ret != SRD_OK) | |
1277 | return ret; | |
1278 | } | |
1279 | ||
1280 | return di->decoder_state; | |
1281 | } | |
1282 | ||
1283 | /** @private */ | |
1284 | SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di) | |
1285 | { | |
1286 | GSList *l; | |
1287 | struct srd_pd_output *pdo; | |
1288 | PyGILState_STATE gstate; | |
1289 | ||
1290 | srd_dbg("Freeing instance %s.", di->inst_id); | |
1291 | ||
1292 | srd_inst_join_decode_thread(di); | |
1293 | ||
1294 | srd_inst_reset_state(di); | |
1295 | ||
1296 | gstate = PyGILState_Ensure(); | |
1297 | Py_DecRef(di->py_inst); | |
1298 | PyGILState_Release(gstate); | |
1299 | ||
1300 | g_free(di->inst_id); | |
1301 | g_free(di->dec_channelmap); | |
1302 | g_free(di->channel_samples); | |
1303 | g_slist_free(di->next_di); | |
1304 | for (l = di->pd_output; l; l = l->next) { | |
1305 | pdo = l->data; | |
1306 | g_free(pdo->proto_id); | |
1307 | g_free(pdo); | |
1308 | } | |
1309 | g_slist_free(di->pd_output); | |
1310 | g_free(di); | |
1311 | } | |
1312 | ||
1313 | /** @private */ | |
1314 | SRD_PRIV void srd_inst_free_all(struct srd_session *sess) | |
1315 | { | |
1316 | if (!sess) | |
1317 | return; | |
1318 | ||
1319 | g_slist_free_full(sess->di_list, (GDestroyNotify)srd_inst_free); | |
1320 | } | |
1321 | ||
1322 | /** @} */ |