2 * This file is part of the libsigrokdecode project.
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
22 #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
23 #include "libsigrokdecode.h"
31 extern SRD_PRIV GSList *sessions;
38 * Decoder instance handling.
42 * @defgroup grp_instances Decoder instances
44 * Decoder instance handling.
49 static void oldpins_array_seed(struct srd_decoder_inst *di)
56 if (di->old_pins_array)
59 count = di->dec_num_channels;
60 arr = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t), count);
61 g_array_set_size(arr, count);
62 memset(arr->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0, count);
63 di->old_pins_array = arr;
66 static void oldpins_array_free(struct srd_decoder_inst *di)
70 if (!di->old_pins_array)
73 srd_dbg("%s: Releasing initial pin state.", di->inst_id);
75 g_array_free(di->old_pins_array, TRUE);
76 di->old_pins_array = NULL;
80 * Set one or more options in a decoder instance.
82 * Handled options are removed from the hash.
84 * @param di Decoder instance.
85 * @param options A GHashTable of options to set.
87 * @return SRD_OK upon success, a (negative) error code otherwise.
91 SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
94 struct srd_decoder_option *sdo;
95 PyObject *py_di_options, *py_optval;
102 PyGILState_STATE gstate;
105 srd_err("Invalid decoder instance.");
110 srd_err("Invalid options GHashTable.");
114 gstate = PyGILState_Ensure();
116 if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) {
117 /* Decoder has no options. */
118 PyGILState_Release(gstate);
119 if (g_hash_table_size(options) == 0) {
120 /* No options provided. */
123 srd_err("Protocol decoder has no options.");
129 ret = SRD_ERR_PYTHON;
133 * The 'options' tuple is a class variable, but we need to
134 * change it. Changing it directly will affect the entire class,
135 * so we need to create a new object for it, and populate that
138 if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options")))
140 Py_DECREF(py_di_options);
141 py_di_options = PyDict_New();
142 PyObject_SetAttrString(di->py_inst, "options", py_di_options);
143 Py_DECREF(py_di_options);
145 for (l = di->decoder->options; l; l = l->next) {
147 if ((value = g_hash_table_lookup(options, sdo->id))) {
148 /* A value was supplied for this option. */
149 if (!g_variant_type_equal(g_variant_get_type(value),
150 g_variant_get_type(sdo->def))) {
151 srd_err("Option '%s' should have the same type "
152 "as the default value.", sdo->id);
156 /* Use default for this option. */
159 if (g_variant_is_of_type(value, G_VARIANT_TYPE_STRING)) {
160 val_str = g_variant_get_string(value, NULL);
161 if (!(py_optval = PyUnicode_FromString(val_str))) {
162 /* Some UTF-8 encoding error. */
164 srd_err("Option '%s' requires a UTF-8 string value.", sdo->id);
167 } else if (g_variant_is_of_type(value, G_VARIANT_TYPE_INT64)) {
168 val_int = g_variant_get_int64(value);
169 if (!(py_optval = PyLong_FromLong(val_int))) {
170 /* ValueError Exception */
172 srd_err("Option '%s' has invalid integer value.", sdo->id);
175 } else if (g_variant_is_of_type(value, G_VARIANT_TYPE_DOUBLE)) {
176 val_double = g_variant_get_double(value);
177 if (!(py_optval = PyFloat_FromDouble(val_double))) {
178 /* ValueError Exception */
180 srd_err("Option '%s' has invalid float value.",
185 if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1)
187 /* Not harmful even if we used the default. */
188 g_hash_table_remove(options, sdo->id);
190 if (g_hash_table_size(options) != 0)
191 srd_warn("Unknown options specified for '%s'", di->inst_id);
196 Py_XDECREF(py_optval);
197 if (PyErr_Occurred()) {
198 srd_exception_catch("Stray exception in srd_inst_option_set()");
199 ret = SRD_ERR_PYTHON;
201 PyGILState_Release(gstate);
206 /* Helper GComparefunc for g_slist_find_custom() in srd_inst_channel_set_all(). */
207 static gint compare_channel_id(const struct srd_channel *pdch,
208 const char *channel_id)
210 return strcmp(pdch->id, channel_id);
214 * Set all channels in a decoder instance.
216 * This function sets _all_ channels for the specified decoder instance, i.e.,
217 * it overwrites any channels that were already defined (if any).
219 * @param di Decoder instance.
220 * @param new_channels A GHashTable of channels to set. Key is channel name,
221 * value is the channel number. Samples passed to this
222 * instance will be arranged in this order.
224 * @return SRD_OK upon success, a (negative) error code otherwise.
228 SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di,
229 GHashTable *new_channels)
231 GVariant *channel_val;
234 struct srd_channel *pdch;
235 int *new_channelmap, new_channelnum, num_required_channels, i;
238 srd_dbg("Setting channels for instance %s with list of %d channels.",
239 di->inst_id, g_hash_table_size(new_channels));
241 if (g_hash_table_size(new_channels) == 0)
242 /* No channels provided. */
245 if (di->dec_num_channels == 0) {
246 /* Decoder has no channels. */
247 srd_err("Protocol decoder %s has no channels to define.",
252 new_channelmap = g_malloc0(sizeof(int) * di->dec_num_channels);
255 * For now, map all indexes to channel -1 (can be overridden later).
256 * This -1 is interpreted as an unspecified channel later.
258 for (i = 0; i < di->dec_num_channels; i++)
259 new_channelmap[i] = -1;
261 for (l = g_hash_table_get_keys(new_channels); l; l = l->next) {
262 channel_id = l->data;
263 channel_val = g_hash_table_lookup(new_channels, channel_id);
264 if (!g_variant_is_of_type(channel_val, G_VARIANT_TYPE_INT32)) {
265 /* Channel name was specified without a value. */
266 srd_err("No channel number was specified for %s.",
268 g_free(new_channelmap);
271 new_channelnum = g_variant_get_int32(channel_val);
272 if (!(sl = g_slist_find_custom(di->decoder->channels, channel_id,
273 (GCompareFunc)compare_channel_id))) {
274 /* Fall back on optional channels. */
275 if (!(sl = g_slist_find_custom(di->decoder->opt_channels,
276 channel_id, (GCompareFunc)compare_channel_id))) {
277 srd_err("Protocol decoder %s has no channel "
278 "'%s'.", di->decoder->name, channel_id);
279 g_free(new_channelmap);
284 new_channelmap[pdch->order] = new_channelnum;
285 srd_dbg("Setting channel mapping: %s (PD ch idx %d) = input data ch idx %d.",
286 pdch->id, pdch->order, new_channelnum);
289 srd_dbg("Final channel map:");
290 num_required_channels = g_slist_length(di->decoder->channels);
291 for (i = 0; i < di->dec_num_channels; i++) {
292 GSList *ll = g_slist_nth(di->decoder->channels, i);
294 ll = g_slist_nth(di->decoder->opt_channels,
295 i - num_required_channels);
297 srd_dbg(" - PD ch idx %d (%s) = input data ch idx %d (%s)", i,
298 pdch->id, new_channelmap[i],
299 (i < num_required_channels) ? "required" : "optional");
302 /* Report an error if not all required channels were specified. */
303 for (i = 0; i < num_required_channels; i++) {
304 if (new_channelmap[i] != -1)
306 pdch = g_slist_nth(di->decoder->channels, i)->data;
307 srd_err("Required channel '%s' (index %d) was not specified.",
309 g_free(new_channelmap);
313 g_free(di->dec_channelmap);
314 di->dec_channelmap = new_channelmap;
320 * Create a new protocol decoder instance.
322 * @param sess The session holding the protocol decoder instance.
324 * @param decoder_id Decoder 'id' field.
325 * @param options GHashtable of options which override the defaults set in
326 * the decoder class. May be NULL.
328 * @return Pointer to a newly allocated struct srd_decoder_inst, or
329 * NULL in case of failure.
333 SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess,
334 const char *decoder_id, GHashTable *options)
337 struct srd_decoder *dec;
338 struct srd_decoder_inst *di;
340 PyGILState_STATE gstate;
347 if (!(dec = srd_decoder_get_by_id(decoder_id))) {
348 srd_err("Protocol decoder %s not found.", decoder_id);
352 di = g_malloc0(sizeof(struct srd_decoder_inst));
358 inst_id = g_hash_table_lookup(options, "id");
360 di->inst_id = g_strdup(inst_id);
361 g_hash_table_remove(options, "id");
364 /* Create a unique instance ID (as none was provided). */
366 di->inst_id = g_strdup_printf("%s-%d", decoder_id, i++);
367 while (srd_inst_find_by_id(sess, di->inst_id)) {
369 di->inst_id = g_strdup_printf("%s-%d", decoder_id, i++);
374 * Prepare a default channel map, where samples come in the
375 * order in which the decoder class defined them.
377 di->dec_num_channels = g_slist_length(di->decoder->channels) +
378 g_slist_length(di->decoder->opt_channels);
379 if (di->dec_num_channels) {
381 g_malloc(sizeof(int) * di->dec_num_channels);
382 for (i = 0; i < di->dec_num_channels; i++)
383 di->dec_channelmap[i] = i;
385 * Will be used to prepare a sample at every iteration
386 * of the instance's decode() method.
388 di->channel_samples = g_malloc(di->dec_num_channels);
391 /* Default to the initial pins being the same as in sample 0. */
392 oldpins_array_seed(di);
394 gstate = PyGILState_Ensure();
396 /* Create a new instance of this decoder class. */
397 if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) {
398 if (PyErr_Occurred())
399 srd_exception_catch("Failed to create %s instance",
401 PyGILState_Release(gstate);
402 g_free(di->dec_channelmap);
407 PyGILState_Release(gstate);
409 if (options && srd_inst_option_set(di, options) != SRD_OK) {
410 g_free(di->dec_channelmap);
415 di->condition_list = NULL;
416 di->match_array = NULL;
417 di->abs_start_samplenum = 0;
418 di->abs_end_samplenum = 0;
421 di->abs_cur_samplenum = 0;
422 di->thread_handle = NULL;
423 di->got_new_samples = FALSE;
424 di->handled_all_samples = FALSE;
425 di->want_wait_terminate = FALSE;
426 di->decoder_state = SRD_OK;
429 * Strictly speaking initialization of statically allocated
430 * condition and mutex variables (or variables allocated on the
431 * stack) is not required, but won't harm either. Explicitly
432 * running init() will better match subsequent clear() calls.
434 g_cond_init(&di->got_new_samples_cond);
435 g_cond_init(&di->handled_all_samples_cond);
436 g_mutex_init(&di->data_mutex);
438 /* Instance takes input from a frontend by default. */
439 sess->di_list = g_slist_append(sess->di_list, di);
440 srd_dbg("Creating new %s instance %s.", decoder_id, di->inst_id);
445 static void srd_inst_join_decode_thread(struct srd_decoder_inst *di)
449 if (!di->thread_handle)
452 srd_dbg("%s: Joining decoder thread.", di->inst_id);
455 * Terminate potentially running threads which still
456 * execute the decoder instance's decode() method.
458 srd_dbg("%s: Raising want_term, sending got_new.", di->inst_id);
459 g_mutex_lock(&di->data_mutex);
460 di->want_wait_terminate = TRUE;
461 g_cond_signal(&di->got_new_samples_cond);
462 g_mutex_unlock(&di->data_mutex);
464 srd_dbg("%s: Running join().", di->inst_id);
465 (void)g_thread_join(di->thread_handle);
466 srd_dbg("%s: Call to join() done.", di->inst_id);
467 di->thread_handle = NULL;
470 * Reset condition and mutex variables, such that next
471 * operations on them will find them in a clean state.
473 g_cond_clear(&di->got_new_samples_cond);
474 g_cond_init(&di->got_new_samples_cond);
475 g_cond_clear(&di->handled_all_samples_cond);
476 g_cond_init(&di->handled_all_samples_cond);
477 g_mutex_clear(&di->data_mutex);
478 g_mutex_init(&di->data_mutex);
481 static void srd_inst_reset_state(struct srd_decoder_inst *di)
486 srd_dbg("%s: Resetting decoder state.", di->inst_id);
488 /* Reset internal state of the decoder. */
489 condition_list_free(di);
490 match_array_free(di);
491 di->abs_start_samplenum = 0;
492 di->abs_end_samplenum = 0;
495 di->abs_cur_samplenum = 0;
496 oldpins_array_free(di);
497 di->got_new_samples = FALSE;
498 di->handled_all_samples = FALSE;
499 di->want_wait_terminate = FALSE;
500 di->decoder_state = SRD_OK;
501 /* Conditions and mutex got reset after joining the thread. */
505 * Stack a decoder instance on top of another.
507 * @param sess The session holding the protocol decoder instances.
509 * @param di_bottom The instance on top of which di_top will be stacked.
510 * @param di_top The instance to go on top.
512 * @return SRD_OK upon success, a (negative) error code otherwise.
516 SRD_API int srd_inst_stack(struct srd_session *sess,
517 struct srd_decoder_inst *di_bottom,
518 struct srd_decoder_inst *di_top)
523 if (!di_bottom || !di_top) {
524 srd_err("Invalid from/to instance pair.");
528 if (g_slist_find(sess->di_list, di_top)) {
529 /* Remove from the unstacked list. */
530 sess->di_list = g_slist_remove(sess->di_list, di_top);
534 * Check if there's at least one matching input/output pair
535 * for the stacked PDs. We warn if that's not the case, but it's
536 * not a hard error for the time being.
538 gboolean at_least_one_match = FALSE;
539 for (GSList *out = di_bottom->decoder->outputs; out; out = out->next) {
540 const char *o = out->data;
541 for (GSList *in = di_top->decoder->inputs; in; in = in->next) {
542 const char *i = in->data;
544 at_least_one_match = TRUE;
550 if (!at_least_one_match)
551 srd_warn("No matching in-/output when stacking %s onto %s.",
552 di_top->inst_id, di_bottom->inst_id);
554 /* Stack on top of source di. */
555 di_bottom->next_di = g_slist_append(di_bottom->next_di, di_top);
557 srd_dbg("Stacking %s onto %s.", di_top->inst_id, di_bottom->inst_id);
563 * Search a decoder instance and its stack for instance ID.
565 * @param[in] inst_id ID to search for.
566 * @param[in] stack A decoder instance, potentially with stacked instances.
568 * @return The matching instance, or NULL.
570 static struct srd_decoder_inst *srd_inst_find_by_id_stack(const char *inst_id,
571 struct srd_decoder_inst *stack)
574 struct srd_decoder_inst *tmp, *di;
576 if (!strcmp(stack->inst_id, inst_id))
579 /* Otherwise, look recursively in our stack. */
581 if (stack->next_di) {
582 for (l = stack->next_di; l; l = l->next) {
584 if (!strcmp(tmp->inst_id, inst_id)) {
595 * Find a decoder instance by its instance ID.
597 * This will recurse to find the instance anywhere in the stack tree of the
600 * @param sess The session holding the protocol decoder instance.
602 * @param inst_id The instance ID to be found.
604 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
608 SRD_API struct srd_decoder_inst *srd_inst_find_by_id(struct srd_session *sess,
612 struct srd_decoder_inst *tmp, *di;
618 for (l = sess->di_list; l; l = l->next) {
620 if ((di = srd_inst_find_by_id_stack(inst_id, tmp)) != NULL)
628 * Set the list of initial (assumed) pin values.
630 * @param di Decoder instance to use. Must not be NULL.
631 * @param initial_pins A GArray of uint8_t values. Must not be NULL.
635 SRD_API int srd_inst_initial_pins_set_all(struct srd_decoder_inst *di, GArray *initial_pins)
641 srd_err("Invalid decoder instance.");
648 if (initial_pins->len != (guint)di->dec_num_channels) {
649 srd_err("Incorrect number of channels (need %d, got %d).",
650 di->dec_num_channels, initial_pins->len);
654 /* Sanity-check initial pin state values. */
655 for (i = 0; i < di->dec_num_channels; i++) {
656 if (initial_pins->data[i] <= 2)
658 srd_err("Invalid initial channel %d pin state: %d.",
659 i, initial_pins->data[i]);
663 s = g_string_sized_new(100);
664 oldpins_array_seed(di);
665 for (i = 0; i < di->dec_num_channels; i++) {
666 di->old_pins_array->data[i] = initial_pins->data[i];
667 g_string_append_printf(s, "%d, ", di->old_pins_array->data[i]);
669 s = g_string_truncate(s, s->len - 2);
670 srd_dbg("Initial pins: %s.", s->str);
671 g_string_free(s, TRUE);
677 SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di)
679 PyObject *py_res, *py_samplenum;
681 struct srd_decoder_inst *next_di;
683 PyGILState_STATE gstate;
685 srd_dbg("Calling start() of instance %s.", di->inst_id);
687 gstate = PyGILState_Ensure();
689 /* Run self.start(). */
690 if (!(py_res = PyObject_CallMethod(di->py_inst, "start", NULL))) {
691 srd_exception_catch("Protocol decoder instance %s",
693 PyGILState_Release(gstate);
694 return SRD_ERR_PYTHON;
698 /* Set self.samplenum to 0. */
699 py_samplenum = PyLong_FromLong(0);
700 PyObject_SetAttrString(di->py_inst, "samplenum", py_samplenum);
701 Py_DECREF(py_samplenum);
703 /* Set self.matched to None. */
704 PyObject_SetAttrString(di->py_inst, "matched", Py_None);
706 PyGILState_Release(gstate);
708 /* Start all the PDs stacked on top of this one. */
709 for (l = di->next_di; l; l = l->next) {
711 if ((ret = srd_inst_start(next_di)) != SRD_OK)
719 * Check whether the specified sample matches the specified term.
721 * In the case of SRD_TERM_SKIP, this function can modify
722 * term->num_samples_already_skipped.
724 * @param old_sample The value of the previous sample (0/1).
725 * @param sample The value of the current sample (0/1).
726 * @param term The term that should be checked for a match. Must not be NULL.
728 * @retval TRUE The current sample matches the specified term.
729 * @retval FALSE The current sample doesn't match the specified term, or an
730 * invalid term was provided.
734 __attribute__((always_inline))
735 static inline gboolean sample_matches(uint8_t old_sample, uint8_t sample, struct srd_term *term)
737 /* Caller ensures term != NULL. */
739 switch (term->type) {
748 case SRD_TERM_RISING_EDGE:
749 if (old_sample == 0 && sample == 1)
752 case SRD_TERM_FALLING_EDGE:
753 if (old_sample == 1 && sample == 0)
756 case SRD_TERM_EITHER_EDGE:
757 if ((old_sample == 1 && sample == 0) || (old_sample == 0 && sample == 1))
760 case SRD_TERM_NO_EDGE:
761 if ((old_sample == 0 && sample == 0) || (old_sample == 1 && sample == 1))
765 if (term->num_samples_already_skipped == term->num_samples_to_skip)
767 term->num_samples_already_skipped++;
770 srd_err("Unknown term type %d.", term->type);
778 SRD_PRIV void match_array_free(struct srd_decoder_inst *di)
780 if (!di || !di->match_array)
783 g_array_free(di->match_array, TRUE);
784 di->match_array = NULL;
788 SRD_PRIV void condition_list_free(struct srd_decoder_inst *di)
795 for (l = di->condition_list; l; l = l->next) {
798 g_slist_free_full(ll, g_free);
801 g_slist_free(di->condition_list);
802 di->condition_list = NULL;
805 static gboolean have_non_null_conds(const struct srd_decoder_inst *di)
812 for (l = di->condition_list; l; l = l->next) {
821 static void update_old_pins_array(struct srd_decoder_inst *di,
822 const uint8_t *sample_pos)
825 int i, byte_offset, bit_offset;
827 if (!di || !di->dec_channelmap || !sample_pos)
830 oldpins_array_seed(di);
831 for (i = 0; i < di->dec_num_channels; i++) {
832 byte_offset = di->dec_channelmap[i] / 8;
833 bit_offset = di->dec_channelmap[i] % 8;
834 sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
835 di->old_pins_array->data[i] = sample;
839 static void update_old_pins_array_initial_pins(struct srd_decoder_inst *di)
842 int i, byte_offset, bit_offset;
843 const uint8_t *sample_pos;
845 if (!di || !di->dec_channelmap)
848 sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize);
850 oldpins_array_seed(di);
851 for (i = 0; i < di->dec_num_channels; i++) {
852 if (di->old_pins_array->data[i] != SRD_INITIAL_PIN_SAME_AS_SAMPLE0)
854 byte_offset = di->dec_channelmap[i] / 8;
855 bit_offset = di->dec_channelmap[i] % 8;
856 sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
857 di->old_pins_array->data[i] = sample;
861 static gboolean term_matches(const struct srd_decoder_inst *di,
862 struct srd_term *term, const uint8_t *sample_pos)
864 uint8_t old_sample, sample;
865 int byte_offset, bit_offset, ch;
867 /* Caller ensures di, di->dec_channelmap, term, sample_pos != NULL. */
869 if (term->type == SRD_TERM_SKIP)
870 return sample_matches(0, 0, term);
873 byte_offset = di->dec_channelmap[ch] / 8;
874 bit_offset = di->dec_channelmap[ch] % 8;
875 sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
876 old_sample = di->old_pins_array->data[ch];
878 return sample_matches(old_sample, sample, term);
881 static gboolean all_terms_match(const struct srd_decoder_inst *di,
882 const GSList *cond, const uint8_t *sample_pos)
885 struct srd_term *term;
887 /* Caller ensures di, cond, sample_pos != NULL. */
889 for (l = cond; l; l = l->next) {
891 if (!term_matches(di, term, sample_pos))
898 static gboolean at_least_one_condition_matched(
899 const struct srd_decoder_inst *di, unsigned int num_conditions)
903 /* Caller ensures di != NULL. */
905 for (i = 0; i < num_conditions; i++) {
906 if (di->match_array->data[i])
913 static gboolean find_match(struct srd_decoder_inst *di)
915 uint64_t i, j, num_samples_to_process;
917 const uint8_t *sample_pos;
918 unsigned int num_conditions;
920 /* Caller ensures di != NULL. */
922 /* Check whether the condition list is NULL/empty. */
923 if (!di->condition_list) {
924 srd_dbg("NULL/empty condition list, automatic match.");
928 /* Check whether we have any non-NULL conditions. */
929 if (!have_non_null_conds(di)) {
930 srd_dbg("Only NULL conditions in list, automatic match.");
934 num_samples_to_process = di->abs_end_samplenum - di->abs_cur_samplenum;
935 num_conditions = g_slist_length(di->condition_list);
937 /* di->match_array is NULL here. Create a new GArray. */
938 di->match_array = g_array_sized_new(FALSE, TRUE, sizeof(gboolean), num_conditions);
939 g_array_set_size(di->match_array, num_conditions);
941 /* Sample 0: Set di->old_pins_array for SRD_INITIAL_PIN_SAME_AS_SAMPLE0 pins. */
942 if (di->abs_cur_samplenum == 0)
943 update_old_pins_array_initial_pins(di);
945 for (i = 0; i < num_samples_to_process; i++, (di->abs_cur_samplenum)++) {
947 sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize);
949 /* Check whether the current sample matches at least one of the conditions (logical OR). */
950 /* IMPORTANT: We need to check all conditions, even if there was a match already! */
951 for (l = di->condition_list, j = 0; l; l = l->next, j++) {
955 /* All terms in 'cond' must match (logical AND). */
956 di->match_array->data[j] = all_terms_match(di, cond, sample_pos);
959 update_old_pins_array(di, sample_pos);
961 /* If at least one condition matched we're done. */
962 if (at_least_one_condition_matched(di, num_conditions))
970 * Process available samples and check if they match the defined conditions.
972 * This function returns if there is an error, or when a match is found, or
973 * when all samples have been processed (whether a match was found or not).
974 * This function immediately terminates when the decoder's wait() method
975 * invocation shall get terminated.
977 * @param di The decoder instance to use. Must not be NULL.
978 * @param found_match Will be set to TRUE if at least one condition matched,
979 * FALSE otherwise. Must not be NULL.
981 * @retval SRD_OK No errors occured, see found_match for the result.
982 * @retval SRD_ERR_ARG Invalid arguments.
986 SRD_PRIV int process_samples_until_condition_match(struct srd_decoder_inst *di, gboolean *found_match)
988 if (!di || !found_match)
991 *found_match = FALSE;
992 if (di->want_wait_terminate)
995 /* Check if any of the current condition(s) match. */
997 /* Feed the (next chunk of the) buffer to find_match(). */
998 *found_match = find_match(di);
1000 /* Did we handle all samples yet? */
1001 if (di->abs_cur_samplenum >= di->abs_end_samplenum) {
1002 srd_dbg("Done, handled all samples (abs cur %" PRIu64
1003 " / abs end %" PRIu64 ").",
1004 di->abs_cur_samplenum, di->abs_end_samplenum);
1008 /* If we didn't find a match, continue looking. */
1009 if (!(*found_match))
1012 /* At least one condition matched, return. */
1020 * Worker thread (per PD-stack).
1022 * @param data Pointer to the lowest-level PD's device instance.
1025 * @return NULL if there was an error.
1027 static gpointer di_thread(gpointer data)
1030 struct srd_decoder_inst *di;
1032 PyGILState_STATE gstate;
1039 srd_dbg("%s: Starting thread routine for decoder.", di->inst_id);
1041 gstate = PyGILState_Ensure();
1044 * Call self.decode(). Only returns if the PD throws an exception.
1045 * "Regular" termination of the decode() method is not expected.
1047 Py_IncRef(di->py_inst);
1048 srd_dbg("%s: Calling decode().", di->inst_id);
1049 py_res = PyObject_CallMethod(di->py_inst, "decode", NULL);
1050 srd_dbg("%s: decode() terminated.", di->inst_id);
1053 di->decoder_state = SRD_ERR;
1056 * Make sure to unblock potentially pending srd_inst_decode()
1057 * calls in application threads after the decode() method might
1058 * have terminated, while it neither has processed sample data
1059 * nor has terminated upon request. This happens e.g. when "need
1060 * a samplerate to decode" exception is thrown.
1062 g_mutex_lock(&di->data_mutex);
1063 wanted_term = di->want_wait_terminate;
1064 di->want_wait_terminate = TRUE;
1065 di->handled_all_samples = TRUE;
1066 g_cond_signal(&di->handled_all_samples_cond);
1067 g_mutex_unlock(&di->data_mutex);
1070 * Check for the termination cause of the decode() method.
1071 * Though this is mostly for information.
1073 if (!py_res && wanted_term) {
1075 * Silently ignore errors upon return from decode() calls
1076 * when termination was requested. Terminate the thread
1077 * which executed this instance's decode() logic.
1079 srd_dbg("%s: Thread done (!res, want_term).", di->inst_id);
1081 PyGILState_Release(gstate);
1086 * The decode() invocation terminated unexpectedly. Have
1087 * the back trace printed, and terminate the thread which
1088 * executed the decode() method.
1090 srd_dbg("%s: decode() terminated unrequested.", di->inst_id);
1091 srd_exception_catch("Protocol decoder instance %s: ", di->inst_id);
1092 srd_dbg("%s: Thread done (!res, !want_term).", di->inst_id);
1093 PyGILState_Release(gstate);
1098 * TODO: By design the decode() method is not supposed to terminate.
1099 * Nevertheless we have the thread joined, and srd backend calls to
1100 * decode() will re-start another thread transparently.
1102 srd_dbg("%s: decode() terminated (req %d).", di->inst_id, wanted_term);
1106 PyGILState_Release(gstate);
1108 srd_dbg("%s: Thread done (with res).", di->inst_id);
1114 * Decode a chunk of samples.
1116 * The calls to this function must provide the samples that shall be
1117 * used by the protocol decoder
1118 * - in the correct order ([...]5, 6, 4, 7, 8[...] is a bug),
1119 * - starting from sample zero (2, 3, 4, 5, 6[...] is a bug),
1120 * - consecutively, with no gaps (0, 1, 2, 4, 5[...] is a bug).
1122 * The start- and end-sample numbers are absolute sample numbers (relative
1123 * to the start of the whole capture/file/stream), i.e. they are not relative
1124 * sample numbers within the chunk specified by 'inbuf' and 'inbuflen'.
1126 * Correct example (4096 samples total, 4 chunks @ 1024 samples each):
1127 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1128 * srd_inst_decode(di, 1024, 2048, inbuf, 1024, 1);
1129 * srd_inst_decode(di, 2048, 3072, inbuf, 1024, 1);
1130 * srd_inst_decode(di, 3072, 4096, inbuf, 1024, 1);
1132 * The chunk size ('inbuflen') can be arbitrary and can differ between calls.
1134 * Correct example (4096 samples total, 7 chunks @ various samples each):
1135 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1136 * srd_inst_decode(di, 1024, 1124, inbuf, 100, 1);
1137 * srd_inst_decode(di, 1124, 1424, inbuf, 300, 1);
1138 * srd_inst_decode(di, 1424, 1643, inbuf, 219, 1);
1139 * srd_inst_decode(di, 1643, 2048, inbuf, 405, 1);
1140 * srd_inst_decode(di, 2048, 3072, inbuf, 1024, 1);
1141 * srd_inst_decode(di, 3072, 4096, inbuf, 1024, 1);
1143 * INCORRECT example (4096 samples total, 4 chunks @ 1024 samples each, but
1144 * the start- and end-samplenumbers are not absolute):
1145 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1146 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1147 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1148 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1150 * @param di The decoder instance to call. Must not be NULL.
1151 * @param abs_start_samplenum The absolute starting sample number for the
1152 * buffer's sample set, relative to the start of capture.
1153 * @param abs_end_samplenum The absolute ending sample number for the
1154 * buffer's sample set, relative to the start of capture.
1155 * @param inbuf The buffer to decode. Must not be NULL.
1156 * @param inbuflen Length of the buffer. Must be > 0.
1157 * @param unitsize The number of bytes per sample. Must be > 0.
1159 * @return SRD_OK upon success, a (negative) error code otherwise.
1163 SRD_PRIV int srd_inst_decode(struct srd_decoder_inst *di,
1164 uint64_t abs_start_samplenum, uint64_t abs_end_samplenum,
1165 const uint8_t *inbuf, uint64_t inbuflen, uint64_t unitsize)
1167 /* Return an error upon unusable input. */
1169 srd_dbg("empty decoder instance");
1173 srd_dbg("NULL buffer pointer");
1176 if (inbuflen == 0) {
1177 srd_dbg("empty buffer");
1180 if (unitsize == 0) {
1181 srd_dbg("unitsize 0");
1185 if (abs_start_samplenum != di->abs_cur_samplenum ||
1186 abs_end_samplenum < abs_start_samplenum) {
1187 srd_dbg("Incorrect sample numbers: start=%" PRIu64 ", cur=%"
1188 PRIu64 ", end=%" PRIu64 ".", abs_start_samplenum,
1189 di->abs_cur_samplenum, abs_end_samplenum);
1193 di->data_unitsize = unitsize;
1195 srd_dbg("Decoding: abs start sample %" PRIu64 ", abs end sample %"
1196 PRIu64 " (%" PRIu64 " samples, %" PRIu64 " bytes, unitsize = "
1197 "%d), instance %s.", abs_start_samplenum, abs_end_samplenum,
1198 abs_end_samplenum - abs_start_samplenum, inbuflen, di->data_unitsize,
1201 /* If this is the first call, start the worker thread. */
1202 if (!di->thread_handle) {
1203 srd_dbg("No worker thread for this decoder stack "
1204 "exists yet, creating one: %s.", di->inst_id);
1205 di->thread_handle = g_thread_new(di->inst_id,
1209 /* Push the new sample chunk to the worker thread. */
1210 g_mutex_lock(&di->data_mutex);
1211 di->abs_start_samplenum = abs_start_samplenum;
1212 di->abs_end_samplenum = abs_end_samplenum;
1214 di->inbuflen = inbuflen;
1215 di->got_new_samples = TRUE;
1216 di->handled_all_samples = FALSE;
1218 /* Signal the thread that we have new data. */
1219 g_cond_signal(&di->got_new_samples_cond);
1220 g_mutex_unlock(&di->data_mutex);
1222 /* When all samples in this chunk were handled, return. */
1223 g_mutex_lock(&di->data_mutex);
1224 while (!di->handled_all_samples && !di->want_wait_terminate)
1225 g_cond_wait(&di->handled_all_samples_cond, &di->data_mutex);
1226 g_mutex_unlock(&di->data_mutex);
1228 if (di->want_wait_terminate)
1229 return SRD_ERR_TERM_REQ;
1235 * Terminate current decoder work, prepare for re-use on new input data.
1237 * Terminates all decoder operations in the specified decoder instance
1238 * and the instances stacked on top of it. Resets internal state such
1239 * that the previously constructed stack can process new input data that
1240 * is not related to previously processed input data. This avoids the
1241 * expensive and complex re-construction of decoder stacks.
1243 * Callers are expected to follow up with start, metadata, and decode
1244 * calls like they would for newly constructed decoder stacks.
1246 * @param di The decoder instance to call. Must not be NULL.
1248 * @return SRD_OK upon success, a (negative) error code otherwise.
1252 SRD_PRIV int srd_inst_terminate_reset(struct srd_decoder_inst *di)
1254 PyGILState_STATE gstate;
1263 * Request termination and wait for previously initiated
1264 * background operation to finish. Reset internal state, but
1265 * do not start releasing resources yet. This shall result in
1266 * decoders' state just like after creation. This block handles
1267 * the C language library side.
1269 srd_dbg("Terminating instance %s", di->inst_id);
1270 srd_inst_join_decode_thread(di);
1271 srd_inst_reset_state(di);
1274 * Have the Python side's .reset() method executed (if the PD
1275 * implements it). It's assumed that .reset() assigns variables
1276 * very much like __init__() used to do in the past. Thus memory
1277 * that was allocated in previous calls gets released by Python
1278 * as it's not referenced any longer.
1280 gstate = PyGILState_Ensure();
1281 if (PyObject_HasAttrString(di->py_inst, "reset")) {
1282 srd_dbg("Calling reset() of instance %s", di->inst_id);
1283 py_ret = PyObject_CallMethod(di->py_inst, "reset", NULL);
1286 PyGILState_Release(gstate);
1288 /* Pass the "restart" request to all stacked decoders. */
1289 for (l = di->next_di; l; l = l->next) {
1290 ret = srd_inst_terminate_reset(l->data);
1295 return di->decoder_state;
1299 SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
1302 struct srd_pd_output *pdo;
1303 PyGILState_STATE gstate;
1305 srd_dbg("Freeing instance %s.", di->inst_id);
1307 srd_inst_join_decode_thread(di);
1309 srd_inst_reset_state(di);
1311 gstate = PyGILState_Ensure();
1312 Py_DecRef(di->py_inst);
1313 PyGILState_Release(gstate);
1315 g_free(di->inst_id);
1316 g_free(di->dec_channelmap);
1317 g_free(di->channel_samples);
1318 g_slist_free(di->next_di);
1319 for (l = di->pd_output; l; l = l->next) {
1321 g_free(pdo->proto_id);
1324 g_slist_free(di->pd_output);
1329 SRD_PRIV void srd_inst_free_all(struct srd_session *sess)
1334 g_slist_free_full(sess->di_list, (GDestroyNotify)srd_inst_free);