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;
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_free(struct srd_decoder_inst *di);
42 * Decoder instance handling.
46 * @defgroup grp_instances Decoder instances
48 * Decoder instance handling.
54 * Set one or more options in a decoder instance.
56 * Handled options are removed from the hash.
58 * @param di Decoder instance.
59 * @param options A GHashTable of options to set.
61 * @return SRD_OK upon success, a (negative) error code otherwise.
65 SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
68 struct srd_decoder_option *sdo;
69 PyObject *py_di_options, *py_optval;
76 PyGILState_STATE gstate;
79 srd_err("Invalid decoder instance.");
84 srd_err("Invalid options GHashTable.");
88 gstate = PyGILState_Ensure();
90 if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) {
91 /* Decoder has no options. */
92 PyGILState_Release(gstate);
93 if (g_hash_table_size(options) == 0) {
94 /* No options provided. */
97 srd_err("Protocol decoder has no options.");
103 ret = SRD_ERR_PYTHON;
107 * The 'options' tuple is a class variable, but we need to
108 * change it. Changing it directly will affect the entire class,
109 * so we need to create a new object for it, and populate that
112 if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options")))
114 Py_DECREF(py_di_options);
115 py_di_options = PyDict_New();
116 PyObject_SetAttrString(di->py_inst, "options", py_di_options);
118 for (l = di->decoder->options; l; l = l->next) {
120 if ((value = g_hash_table_lookup(options, sdo->id))) {
121 /* A value was supplied for this option. */
122 if (!g_variant_type_equal(g_variant_get_type(value),
123 g_variant_get_type(sdo->def))) {
124 srd_err("Option '%s' should have the same type "
125 "as the default value.", sdo->id);
129 /* Use default for this option. */
132 if (g_variant_is_of_type(value, G_VARIANT_TYPE_STRING)) {
133 val_str = g_variant_get_string(value, NULL);
134 if (!(py_optval = PyUnicode_FromString(val_str))) {
135 /* Some UTF-8 encoding error. */
137 srd_err("Option '%s' requires a UTF-8 string value.", sdo->id);
140 } else if (g_variant_is_of_type(value, G_VARIANT_TYPE_INT64)) {
141 val_int = g_variant_get_int64(value);
142 if (!(py_optval = PyLong_FromLong(val_int))) {
143 /* ValueError Exception */
145 srd_err("Option '%s' has invalid integer value.", sdo->id);
148 } else if (g_variant_is_of_type(value, G_VARIANT_TYPE_DOUBLE)) {
149 val_double = g_variant_get_double(value);
150 if (!(py_optval = PyFloat_FromDouble(val_double))) {
151 /* ValueError Exception */
153 srd_err("Option '%s' has invalid float value.",
158 if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1)
160 /* Not harmful even if we used the default. */
161 g_hash_table_remove(options, sdo->id);
163 if (g_hash_table_size(options) != 0)
164 srd_warn("Unknown options specified for '%s'", di->inst_id);
169 Py_XDECREF(py_optval);
170 if (PyErr_Occurred()) {
171 srd_exception_catch("Stray exception in srd_inst_option_set()");
172 ret = SRD_ERR_PYTHON;
174 PyGILState_Release(gstate);
179 /* Helper GComparefunc for g_slist_find_custom() in srd_inst_channel_set_all() */
180 static gint compare_channel_id(const struct srd_channel *pdch,
181 const char *channel_id)
183 return strcmp(pdch->id, channel_id);
187 * Set all channels in a decoder instance.
189 * This function sets _all_ channels for the specified decoder instance, i.e.,
190 * it overwrites any channels that were already defined (if any).
192 * @param di Decoder instance.
193 * @param new_channels A GHashTable of channels to set. Key is channel name,
194 * value is the channel number. Samples passed to this
195 * instance will be arranged in this order.
197 * @return SRD_OK upon success, a (negative) error code otherwise.
201 SRD_API int srd_inst_channel_set_all(struct srd_decoder_inst *di,
202 GHashTable *new_channels)
204 GVariant *channel_val;
207 struct srd_channel *pdch;
208 int *new_channelmap, new_channelnum, num_required_channels, i;
211 srd_dbg("Setting channels for instance %s with list of %d channels.",
212 di->inst_id, g_hash_table_size(new_channels));
214 if (g_hash_table_size(new_channels) == 0)
215 /* No channels provided. */
218 if (di->dec_num_channels == 0) {
219 /* Decoder has no channels. */
220 srd_err("Protocol decoder %s has no channels to define.",
225 new_channelmap = g_malloc(sizeof(int) * di->dec_num_channels);
228 * For now, map all indexes to channel -1 (can be overridden later).
229 * This -1 is interpreted as an unspecified channel later.
231 for (i = 0; i < di->dec_num_channels; i++)
232 new_channelmap[i] = -1;
234 for (l = g_hash_table_get_keys(new_channels); l; l = l->next) {
235 channel_id = l->data;
236 channel_val = g_hash_table_lookup(new_channels, channel_id);
237 if (!g_variant_is_of_type(channel_val, G_VARIANT_TYPE_INT32)) {
238 /* Channel name was specified without a value. */
239 srd_err("No channel number was specified for %s.",
241 g_free(new_channelmap);
244 new_channelnum = g_variant_get_int32(channel_val);
245 if (!(sl = g_slist_find_custom(di->decoder->channels, channel_id,
246 (GCompareFunc)compare_channel_id))) {
247 /* Fall back on optional channels. */
248 if (!(sl = g_slist_find_custom(di->decoder->opt_channels,
249 channel_id, (GCompareFunc)compare_channel_id))) {
250 srd_err("Protocol decoder %s has no channel "
251 "'%s'.", di->decoder->name, channel_id);
252 g_free(new_channelmap);
257 new_channelmap[pdch->order] = new_channelnum;
258 srd_dbg("Setting channel mapping: %s (index %d) = channel %d.",
259 pdch->id, pdch->order, new_channelnum);
262 srd_dbg("Final channel map:");
263 num_required_channels = g_slist_length(di->decoder->channels);
264 for (i = 0; i < di->dec_num_channels; i++) {
265 srd_dbg(" - index %d = channel %d (%s)", i, new_channelmap[i],
266 (i < num_required_channels) ? "required" : "optional");
269 /* Report an error if not all required channels were specified. */
270 for (i = 0; i < num_required_channels; i++) {
271 if (new_channelmap[i] != -1)
273 pdch = g_slist_nth(di->decoder->channels, i)->data;
274 srd_err("Required channel '%s' (index %d) was not specified.",
279 g_free(di->dec_channelmap);
280 di->dec_channelmap = new_channelmap;
286 * Create a new protocol decoder instance.
288 * @param sess The session holding the protocol decoder instance.
289 * @param decoder_id Decoder 'id' field.
290 * @param options GHashtable of options which override the defaults set in
291 * the decoder class. May be NULL.
293 * @return Pointer to a newly allocated struct srd_decoder_inst, or
294 * NULL in case of failure.
298 SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess,
299 const char *decoder_id, GHashTable *options)
302 struct srd_decoder *dec;
303 struct srd_decoder_inst *di;
305 PyGILState_STATE gstate;
308 srd_dbg("Creating new %s instance.", decoder_id);
310 if (session_is_valid(sess) != SRD_OK) {
311 srd_err("Invalid session.");
315 if (!(dec = srd_decoder_get_by_id(decoder_id))) {
316 srd_err("Protocol decoder %s not found.", decoder_id);
320 di = g_malloc0(sizeof(struct srd_decoder_inst));
326 inst_id = g_hash_table_lookup(options, "id");
328 di->inst_id = g_strdup(inst_id);
329 g_hash_table_remove(options, "id");
332 /* Create a unique instance ID (as none was provided). */
334 di->inst_id = g_strdup_printf("%s-%d", decoder_id, i++);
335 while (srd_inst_find_by_id(sess, di->inst_id)) {
337 di->inst_id = g_strdup_printf("%s-%d", decoder_id, i++);
342 * Prepare a default channel map, where samples come in the
343 * order in which the decoder class defined them.
345 di->dec_num_channels = g_slist_length(di->decoder->channels) +
346 g_slist_length(di->decoder->opt_channels);
347 if (di->dec_num_channels) {
349 g_malloc(sizeof(int) * di->dec_num_channels);
350 for (i = 0; i < di->dec_num_channels; i++)
351 di->dec_channelmap[i] = i;
353 * Will be used to prepare a sample at every iteration
354 * of the instance's decode() method.
356 di->channel_samples = g_malloc(di->dec_num_channels);
359 /* Default to the initial pins being the same as in sample 0. */
360 di->old_pins_array = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t),
361 di->dec_num_channels);
362 g_array_set_size(di->old_pins_array, di->dec_num_channels);
363 memset(di->old_pins_array->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0,
364 di->dec_num_channels);
366 gstate = PyGILState_Ensure();
368 /* Create a new instance of this decoder class. */
369 if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) {
370 if (PyErr_Occurred())
371 srd_exception_catch("Failed to create %s instance",
373 PyGILState_Release(gstate);
374 g_free(di->dec_channelmap);
379 PyGILState_Release(gstate);
381 if (options && srd_inst_option_set(di, options) != SRD_OK) {
382 g_free(di->dec_channelmap);
387 di->condition_list = NULL;
388 di->match_array = NULL;
389 di->abs_start_samplenum = 0;
390 di->abs_end_samplenum = 0;
393 di->abs_cur_samplenum = 0;
394 di->thread_handle = NULL;
395 di->got_new_samples = FALSE;
396 di->handled_all_samples = FALSE;
397 di->want_wait_terminate = FALSE;
400 * Strictly speaking initialization of statically allocated
401 * condition and mutex variables (or variables allocated on the
402 * stack) is not required, but won't harm either. Explicitly
403 * running init() will better match subsequent clear() calls.
405 g_cond_init(&di->got_new_samples_cond);
406 g_cond_init(&di->handled_all_samples_cond);
407 g_mutex_init(&di->data_mutex);
409 /* Instance takes input from a frontend by default. */
410 sess->di_list = g_slist_append(sess->di_list, di);
411 srd_dbg("Created new %s instance with ID %s.", decoder_id, di->inst_id);
416 static void srd_inst_join_decode_thread(struct srd_decoder_inst *di)
420 if (!di->thread_handle)
423 srd_dbg("%s: Joining decoder thread.", di->inst_id);
426 * Terminate potentially running threads which still
427 * execute the decoder instance's decode() method.
429 srd_dbg("%s: Raising want_term, sending got_new.", di->inst_id);
430 g_mutex_lock(&di->data_mutex);
431 di->want_wait_terminate = TRUE;
432 g_cond_signal(&di->got_new_samples_cond);
433 g_mutex_unlock(&di->data_mutex);
435 srd_dbg("%s: Running join().", di->inst_id);
436 (void)g_thread_join(di->thread_handle);
437 srd_dbg("%s: Call to join() done.", di->inst_id);
438 di->thread_handle = NULL;
441 * Reset condition and mutex variables, such that next
442 * operations on them will find them in a clean state.
444 g_cond_clear(&di->got_new_samples_cond);
445 g_cond_init(&di->got_new_samples_cond);
446 g_cond_clear(&di->handled_all_samples_cond);
447 g_cond_init(&di->handled_all_samples_cond);
448 g_mutex_clear(&di->data_mutex);
449 g_mutex_init(&di->data_mutex);
452 static void srd_inst_reset_state(struct srd_decoder_inst *di)
457 srd_dbg("%s: Resetting decoder state.", di->inst_id);
460 * Reset internal state of the decoder.
462 condition_list_free(di);
463 match_array_free(di);
464 di->abs_start_samplenum = 0;
465 di->abs_end_samplenum = 0;
468 di->abs_cur_samplenum = 0;
469 oldpins_array_free(di);
470 di->got_new_samples = FALSE;
471 di->handled_all_samples = FALSE;
472 di->want_wait_terminate = FALSE;
473 /* Conditions and mutex got reset after joining the thread. */
477 * Stack a decoder instance on top of another.
479 * @param sess The session holding the protocol decoder instances.
480 * @param di_bottom The instance on top of which di_top will be stacked.
481 * @param di_top The instance to go on top.
483 * @return SRD_OK upon success, a (negative) error code otherwise.
487 SRD_API int srd_inst_stack(struct srd_session *sess,
488 struct srd_decoder_inst *di_bottom,
489 struct srd_decoder_inst *di_top)
491 if (session_is_valid(sess) != SRD_OK) {
492 srd_err("Invalid session.");
496 if (!di_bottom || !di_top) {
497 srd_err("Invalid from/to instance pair.");
501 if (g_slist_find(sess->di_list, di_top)) {
502 /* Remove from the unstacked list. */
503 sess->di_list = g_slist_remove(sess->di_list, di_top);
506 /* Stack on top of source di. */
507 di_bottom->next_di = g_slist_append(di_bottom->next_di, di_top);
509 srd_dbg("Stacked %s onto %s.", di_top->inst_id, di_bottom->inst_id);
515 * Search a decoder instance and its stack for instance ID.
517 * @param[in] inst_id ID to search for.
518 * @param[in] stack A decoder instance, potentially with stacked instances.
520 * @return The matching instance, or NULL.
522 static struct srd_decoder_inst *srd_inst_find_by_id_stack(const char *inst_id,
523 struct srd_decoder_inst *stack)
526 struct srd_decoder_inst *tmp, *di;
528 if (!strcmp(stack->inst_id, inst_id))
531 /* Otherwise, look recursively in our stack. */
533 if (stack->next_di) {
534 for (l = stack->next_di; l; l = l->next) {
536 if (!strcmp(tmp->inst_id, inst_id)) {
547 * Find a decoder instance by its instance ID.
549 * This will recurse to find the instance anywhere in the stack tree of the
552 * @param sess The session holding the protocol decoder instance.
553 * @param inst_id The instance ID to be found.
555 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
559 SRD_API struct srd_decoder_inst *srd_inst_find_by_id(struct srd_session *sess,
563 struct srd_decoder_inst *tmp, *di;
565 if (session_is_valid(sess) != SRD_OK) {
566 srd_err("Invalid session.");
571 for (l = sess->di_list; l; l = l->next) {
573 if ((di = srd_inst_find_by_id_stack(inst_id, tmp)) != NULL)
580 static struct srd_decoder_inst *srd_sess_inst_find_by_obj(
581 struct srd_session *sess, const GSList *stack,
585 struct srd_decoder_inst *tmp, *di;
587 if (session_is_valid(sess) != SRD_OK) {
588 srd_err("Invalid session.");
593 for (l = stack ? stack : sess->di_list; di == NULL && l != NULL; l = l->next) {
595 if (tmp->py_inst == obj)
597 else if (tmp->next_di)
598 di = srd_sess_inst_find_by_obj(sess, tmp->next_di, obj);
605 * Find a decoder instance by its Python object.
607 * I.e. find that instance's instantiation of the sigrokdecode.Decoder class.
608 * This will recurse to find the instance anywhere in the stack tree of all
611 * @param stack Pointer to a GSList of struct srd_decoder_inst, indicating the
612 * stack to search. To start searching at the bottom level of
613 * decoder instances, pass NULL.
614 * @param obj The Python class instantiation.
616 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
622 SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(const GSList *stack,
625 struct srd_decoder_inst *di;
626 struct srd_session *sess;
630 for (l = sessions; di == NULL && l != NULL; l = l->next) {
632 di = srd_sess_inst_find_by_obj(sess, stack, obj);
639 * Set the list of initial (assumed) pin values.
641 * @param di Decoder instance to use. Must not be NULL.
642 * @param initial_pins A GArray of uint8_t values. Must not be NULL.
646 SRD_API int srd_inst_initial_pins_set_all(struct srd_decoder_inst *di, GArray *initial_pins)
652 srd_err("Invalid decoder instance.");
659 if (initial_pins->len != (guint)di->dec_num_channels) {
660 srd_err("Incorrect number of channels (need %d, got %d).",
661 di->dec_num_channels, initial_pins->len);
665 /* Sanity-check initial pin state values. */
666 for (i = 0; i < di->dec_num_channels; i++) {
667 if (initial_pins->data[i] <= 2)
669 srd_err("Invalid initial channel %d pin state: %d.",
670 i, initial_pins->data[i]);
674 s = g_string_sized_new(100);
675 for (i = 0; i < di->dec_num_channels; i++) {
676 di->old_pins_array->data[i] = initial_pins->data[i];
677 g_string_append_printf(s, "%d, ", di->old_pins_array->data[i]);
679 s = g_string_truncate(s, s->len - 2);
680 srd_dbg("Initial pins: %s.", s->str);
681 g_string_free(s, TRUE);
687 SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di)
691 if (!di->old_pins_array)
694 srd_dbg("%s: Releasing initial pin state.", di->inst_id);
696 g_array_free(di->old_pins_array, TRUE);
697 di->old_pins_array = NULL;
701 SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di)
705 struct srd_decoder_inst *next_di;
707 PyGILState_STATE gstate;
709 srd_dbg("Calling start() method on protocol decoder instance %s.",
712 gstate = PyGILState_Ensure();
714 /* Run self.start(). */
715 if (!(py_res = PyObject_CallMethod(di->py_inst, "start", NULL))) {
716 srd_exception_catch("Protocol decoder instance %s",
718 PyGILState_Release(gstate);
719 return SRD_ERR_PYTHON;
723 /* Set self.samplenum to 0. */
724 PyObject_SetAttrString(di->py_inst, "samplenum", PyLong_FromLong(0));
726 /* Set self.matched to None. */
727 PyObject_SetAttrString(di->py_inst, "matched", Py_None);
729 PyGILState_Release(gstate);
731 /* Start all the PDs stacked on top of this one. */
732 for (l = di->next_di; l; l = l->next) {
734 if ((ret = srd_inst_start(next_di)) != SRD_OK)
742 * Check whether the specified sample matches the specified term.
744 * In the case of SRD_TERM_SKIP, this function can modify
745 * term->num_samples_already_skipped.
747 * @param old_sample The value of the previous sample (0/1).
748 * @param sample The value of the current sample (0/1).
749 * @param term The term that should be checked for a match. Must not be NULL.
751 * @retval TRUE The current sample matches the specified term.
752 * @retval FALSE The current sample doesn't match the specified term, or an
753 * invalid term was provided.
757 static gboolean sample_matches(uint8_t old_sample, uint8_t sample, struct srd_term *term)
759 /* Caller ensures term != NULL. */
761 switch (term->type) {
770 case SRD_TERM_RISING_EDGE:
771 if (old_sample == 0 && sample == 1)
774 case SRD_TERM_FALLING_EDGE:
775 if (old_sample == 1 && sample == 0)
778 case SRD_TERM_EITHER_EDGE:
779 if ((old_sample == 1 && sample == 0) || (old_sample == 0 && sample == 1))
782 case SRD_TERM_NO_EDGE:
783 if ((old_sample == 0 && sample == 0) || (old_sample == 1 && sample == 1))
787 if (term->num_samples_already_skipped == term->num_samples_to_skip)
789 term->num_samples_already_skipped++;
792 srd_err("Unknown term type %d.", term->type);
800 SRD_PRIV void match_array_free(struct srd_decoder_inst *di)
802 if (!di || !di->match_array)
805 g_array_free(di->match_array, TRUE);
806 di->match_array = NULL;
810 SRD_PRIV void condition_list_free(struct srd_decoder_inst *di)
817 for (l = di->condition_list; l; l = l->next) {
820 g_slist_free_full(ll, g_free);
823 di->condition_list = NULL;
826 static gboolean have_non_null_conds(const struct srd_decoder_inst *di)
833 for (l = di->condition_list; l; l = l->next) {
842 static void update_old_pins_array(struct srd_decoder_inst *di,
843 const uint8_t *sample_pos)
846 int i, byte_offset, bit_offset;
848 if (!di || !di->dec_channelmap || !sample_pos)
851 for (i = 0; i < di->dec_num_channels; i++) {
852 byte_offset = di->dec_channelmap[i] / 8;
853 bit_offset = di->dec_channelmap[i] % 8;
854 sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
855 di->old_pins_array->data[i] = sample;
859 static void update_old_pins_array_initial_pins(struct srd_decoder_inst *di)
862 int i, byte_offset, bit_offset;
863 const uint8_t *sample_pos;
865 if (!di || !di->dec_channelmap)
868 sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize);
870 for (i = 0; i < di->dec_num_channels; i++) {
871 if (di->old_pins_array->data[i] != SRD_INITIAL_PIN_SAME_AS_SAMPLE0)
873 byte_offset = di->dec_channelmap[i] / 8;
874 bit_offset = di->dec_channelmap[i] % 8;
875 sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
876 di->old_pins_array->data[i] = sample;
880 static gboolean term_matches(const struct srd_decoder_inst *di,
881 struct srd_term *term, const uint8_t *sample_pos)
883 uint8_t old_sample, sample;
884 int byte_offset, bit_offset, ch;
886 /* Caller ensures di, di->dec_channelmap, term, sample_pos != NULL. */
888 if (term->type == SRD_TERM_SKIP)
889 return sample_matches(0, 0, term);
892 byte_offset = di->dec_channelmap[ch] / 8;
893 bit_offset = di->dec_channelmap[ch] % 8;
894 sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
895 old_sample = di->old_pins_array->data[ch];
897 return sample_matches(old_sample, sample, term);
900 static gboolean all_terms_match(const struct srd_decoder_inst *di,
901 const GSList *cond, const uint8_t *sample_pos)
904 struct srd_term *term;
906 /* Caller ensures di, cond, sample_pos != NULL. */
908 for (l = cond; l; l = l->next) {
910 if (!term_matches(di, term, sample_pos))
917 static gboolean at_least_one_condition_matched(
918 const struct srd_decoder_inst *di, unsigned int num_conditions)
922 /* Caller ensures di != NULL. */
924 for (i = 0; i < num_conditions; i++) {
925 if (di->match_array->data[i])
932 static gboolean find_match(struct srd_decoder_inst *di)
934 static uint64_t s = 0;
935 uint64_t i, j, num_samples_to_process;
937 const uint8_t *sample_pos;
938 unsigned int num_conditions;
940 /* Caller ensures di != NULL. */
942 /* Check whether the condition list is NULL/empty. */
943 if (!di->condition_list) {
944 srd_dbg("NULL/empty condition list, automatic match.");
948 /* Check whether we have any non-NULL conditions. */
949 if (!have_non_null_conds(di)) {
950 srd_dbg("Only NULL conditions in list, automatic match.");
954 num_samples_to_process = di->abs_end_samplenum - di->abs_cur_samplenum;
955 num_conditions = g_slist_length(di->condition_list);
957 /* di->match_array is NULL here. Create a new GArray. */
958 di->match_array = g_array_sized_new(FALSE, TRUE, sizeof(gboolean), num_conditions);
959 g_array_set_size(di->match_array, num_conditions);
961 /* Sample 0: Set di->old_pins_array for SRD_INITIAL_PIN_SAME_AS_SAMPLE0 pins. */
962 if (di->abs_cur_samplenum == 0)
963 update_old_pins_array_initial_pins(di);
965 for (i = 0, s = 0; i < num_samples_to_process; i++, s++, (di->abs_cur_samplenum)++) {
967 sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize);
969 /* Check whether the current sample matches at least one of the conditions (logical OR). */
970 /* IMPORTANT: We need to check all conditions, even if there was a match already! */
971 for (l = di->condition_list, j = 0; l; l = l->next, j++) {
975 /* All terms in 'cond' must match (logical AND). */
976 di->match_array->data[j] = all_terms_match(di, cond, sample_pos);
979 update_old_pins_array(di, sample_pos);
981 /* If at least one condition matched we're done. */
982 if (at_least_one_condition_matched(di, num_conditions))
990 * Process available samples and check if they match the defined conditions.
992 * This function returns if there is an error, or when a match is found, or
993 * when all samples have been processed (whether a match was found or not).
994 * This function immediately terminates when the decoder's wait() method
995 * invocation shall get terminated.
997 * @param di The decoder instance to use. Must not be NULL.
998 * @param found_match Will be set to TRUE if at least one condition matched,
999 * FALSE otherwise. Must not be NULL.
1001 * @retval SRD_OK No errors occured, see found_match for the result.
1002 * @retval SRD_ERR_ARG Invalid arguments.
1006 SRD_PRIV int process_samples_until_condition_match(struct srd_decoder_inst *di, gboolean *found_match)
1008 if (!di || !found_match)
1011 *found_match = FALSE;
1012 if (di->want_wait_terminate)
1015 /* Check if any of the current condition(s) match. */
1017 /* Feed the (next chunk of the) buffer to find_match(). */
1018 *found_match = find_match(di);
1020 /* Did we handle all samples yet? */
1021 if (di->abs_cur_samplenum >= di->abs_end_samplenum) {
1022 srd_dbg("Done, handled all samples (abs cur %" PRIu64
1023 " / abs end %" PRIu64 ").",
1024 di->abs_cur_samplenum, di->abs_end_samplenum);
1028 /* If we didn't find a match, continue looking. */
1029 if (!(*found_match))
1032 /* At least one condition matched, return. */
1040 * Worker thread (per PD-stack).
1042 * @param data Pointer to the lowest-level PD's device instance.
1045 * @return NULL if there was an error.
1047 static gpointer di_thread(gpointer data)
1050 struct srd_decoder_inst *di;
1052 PyGILState_STATE gstate;
1059 srd_dbg("%s: Starting thread routine for decoder.", di->inst_id);
1061 gstate = PyGILState_Ensure();
1064 * Call self.decode(). Only returns if the PD throws an exception.
1065 * "Regular" termination of the decode() method is not expected.
1067 Py_IncRef(di->py_inst);
1068 srd_dbg("%s: Calling decode() method.", di->inst_id);
1069 py_res = PyObject_CallMethod(di->py_inst, "decode", NULL);
1070 srd_dbg("%s: decode() method terminated.", di->inst_id);
1073 * Make sure to unblock potentially pending srd_inst_decode()
1074 * calls in application threads after the decode() method might
1075 * have terminated, while it neither has processed sample data
1076 * nor has terminated upon request. This happens e.g. when "need
1077 * a samplerate to decode" exception is thrown.
1079 g_mutex_lock(&di->data_mutex);
1080 wanted_term = di->want_wait_terminate;
1081 di->want_wait_terminate = TRUE;
1082 di->handled_all_samples = TRUE;
1083 g_cond_signal(&di->handled_all_samples_cond);
1084 g_mutex_unlock(&di->data_mutex);
1087 * Check for the termination cause of the decode() method.
1088 * Though this is mostly for information.
1090 if (!py_res && wanted_term) {
1092 * Silently ignore errors upon return from decode() calls
1093 * when termination was requested. Terminate the thread
1094 * which executed this instance's decode() logic.
1096 srd_dbg("%s: Thread done (!res, want_term).", di->inst_id);
1098 PyGILState_Release(gstate);
1103 * The decode() invocation terminated unexpectedly. Have
1104 * the back trace printed, and terminate the thread which
1105 * executed the decode() method.
1107 srd_dbg("%s: decode() terminated unrequested.", di->inst_id);
1108 srd_exception_catch("Protocol decoder instance %s: ", di->inst_id);
1109 srd_dbg("%s: Thread done (!res, !want_term).", di->inst_id);
1110 PyGILState_Release(gstate);
1115 * TODO: By design the decode() method is not supposed to terminate.
1116 * Nevertheless we have the thread joined, and srd backend calls to
1117 * decode() will re-start another thread transparently.
1119 srd_dbg("%s: decode() terminated (req %d).", di->inst_id, wanted_term);
1123 PyGILState_Release(gstate);
1125 srd_dbg("%s: Thread done (with res).", di->inst_id);
1131 * Decode a chunk of samples.
1133 * The calls to this function must provide the samples that shall be
1134 * used by the protocol decoder
1135 * - in the correct order ([...]5, 6, 4, 7, 8[...] is a bug),
1136 * - starting from sample zero (2, 3, 4, 5, 6[...] is a bug),
1137 * - consecutively, with no gaps (0, 1, 2, 4, 5[...] is a bug).
1139 * The start- and end-sample numbers are absolute sample numbers (relative
1140 * to the start of the whole capture/file/stream), i.e. they are not relative
1141 * sample numbers within the chunk specified by 'inbuf' and 'inbuflen'.
1143 * Correct example (4096 samples total, 4 chunks @ 1024 samples each):
1144 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1145 * srd_inst_decode(di, 1024, 2048, inbuf, 1024, 1);
1146 * srd_inst_decode(di, 2048, 3072, inbuf, 1024, 1);
1147 * srd_inst_decode(di, 3072, 4096, inbuf, 1024, 1);
1149 * The chunk size ('inbuflen') can be arbitrary and can differ between calls.
1151 * Correct example (4096 samples total, 7 chunks @ various samples each):
1152 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1153 * srd_inst_decode(di, 1024, 1124, inbuf, 100, 1);
1154 * srd_inst_decode(di, 1124, 1424, inbuf, 300, 1);
1155 * srd_inst_decode(di, 1424, 1643, inbuf, 219, 1);
1156 * srd_inst_decode(di, 1643, 2048, inbuf, 405, 1);
1157 * srd_inst_decode(di, 2048, 3072, inbuf, 1024, 1);
1158 * srd_inst_decode(di, 3072, 4096, inbuf, 1024, 1);
1160 * INCORRECT example (4096 samples total, 4 chunks @ 1024 samples each, but
1161 * the start- and end-samplenumbers are not absolute):
1162 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1163 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1164 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1165 * srd_inst_decode(di, 0, 1024, inbuf, 1024, 1);
1167 * @param di The decoder instance to call. Must not be NULL.
1168 * @param abs_start_samplenum The absolute starting sample number for the
1169 * buffer's sample set, relative to the start of capture.
1170 * @param abs_end_samplenum The absolute ending sample number for the
1171 * buffer's sample set, relative to the start of capture.
1172 * @param inbuf The buffer to decode. Must not be NULL.
1173 * @param inbuflen Length of the buffer. Must be > 0.
1174 * @param unitsize The number of bytes per sample. Must be > 0.
1176 * @return SRD_OK upon success, a (negative) error code otherwise.
1180 SRD_PRIV int srd_inst_decode(struct srd_decoder_inst *di,
1181 uint64_t abs_start_samplenum, uint64_t abs_end_samplenum,
1182 const uint8_t *inbuf, uint64_t inbuflen, uint64_t unitsize)
1184 /* Return an error upon unusable input. */
1186 srd_dbg("empty decoder instance");
1190 srd_dbg("NULL buffer pointer");
1193 if (inbuflen == 0) {
1194 srd_dbg("empty buffer");
1197 if (unitsize == 0) {
1198 srd_dbg("unitsize 0");
1202 if (abs_start_samplenum != di->abs_cur_samplenum ||
1203 abs_end_samplenum < abs_start_samplenum) {
1204 srd_dbg("Incorrect sample numbers: start=%" PRIu64 ", cur=%"
1205 PRIu64 ", end=%" PRIu64 ".", abs_start_samplenum,
1206 di->abs_cur_samplenum, abs_end_samplenum);
1210 di->data_unitsize = unitsize;
1212 srd_dbg("Decoding: abs start sample %" PRIu64 ", abs end sample %"
1213 PRIu64 " (%" PRIu64 " samples, %" PRIu64 " bytes, unitsize = "
1214 "%d), instance %s.", abs_start_samplenum, abs_end_samplenum,
1215 abs_end_samplenum - abs_start_samplenum, inbuflen, di->data_unitsize,
1218 /* If this is the first call, start the worker thread. */
1219 if (!di->thread_handle) {
1220 srd_dbg("No worker thread for this decoder stack "
1221 "exists yet, creating one: %s.", di->inst_id);
1222 di->thread_handle = g_thread_new(di->inst_id,
1226 /* Push the new sample chunk to the worker thread. */
1227 g_mutex_lock(&di->data_mutex);
1228 di->abs_start_samplenum = abs_start_samplenum;
1229 di->abs_end_samplenum = abs_end_samplenum;
1231 di->inbuflen = inbuflen;
1232 di->got_new_samples = TRUE;
1233 di->handled_all_samples = FALSE;
1234 di->want_wait_terminate = FALSE;
1236 /* Signal the thread that we have new data. */
1237 g_cond_signal(&di->got_new_samples_cond);
1238 g_mutex_unlock(&di->data_mutex);
1240 /* When all samples in this chunk were handled, return. */
1241 g_mutex_lock(&di->data_mutex);
1242 while (!di->handled_all_samples && !di->want_wait_terminate)
1243 g_cond_wait(&di->handled_all_samples_cond, &di->data_mutex);
1244 g_mutex_unlock(&di->data_mutex);
1250 SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
1253 struct srd_pd_output *pdo;
1254 PyGILState_STATE gstate;
1256 srd_dbg("Freeing instance %s", di->inst_id);
1258 srd_inst_join_decode_thread(di);
1260 srd_inst_reset_state(di);
1262 gstate = PyGILState_Ensure();
1263 Py_DecRef(di->py_inst);
1264 PyGILState_Release(gstate);
1266 g_free(di->inst_id);
1267 g_free(di->dec_channelmap);
1268 g_free(di->channel_samples);
1269 g_slist_free(di->next_di);
1270 for (l = di->pd_output; l; l = l->next) {
1272 g_free(pdo->proto_id);
1275 g_slist_free(di->pd_output);
1280 SRD_PRIV void srd_inst_free_all(struct srd_session *sess)
1282 if (session_is_valid(sess) != SRD_OK) {
1283 srd_err("Invalid session.");
1287 g_slist_free_full(sess->di_list, (GDestroyNotify)srd_inst_free);