2 * This file is part of the sigrok 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/>.
21 #include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
22 #include "sigrokdecode-internal.h"
29 * @mainpage libsigrokdecode API
31 * @section sec_intro Introduction
33 * The <a href="http://sigrok.org">sigrok</a> project aims at creating a
34 * portable, cross-platform, Free/Libre/Open-Source signal analysis software
35 * suite that supports various device types (such as logic analyzers,
36 * oscilloscopes, multimeters, and more).
38 * <a href="http://sigrok.org/wiki/Libsigrokdecode">libsigrokdecode</a> is a
39 * shared library written in C which provides the basic API for (streaming)
40 * protocol decoding functionality.
42 * The <a href="http://sigrok.org/wiki/Protocol_decoders">protocol decoders</a>
43 * are written in Python (>= 3.0).
45 * @section sec_api API reference
47 * See the "Modules" page for an introduction to various libsigrokdecode
48 * related topics and the detailed API documentation of the respective
51 * You can also browse the API documentation by file, or review all
54 * @section sec_mailinglists Mailing lists
56 * There are two mailing lists for sigrok/libsigrokdecode: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a> and <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-commits">sigrok-commits</a>.
58 * @section sec_irc IRC
60 * You can find the sigrok developers in the
61 * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
62 * IRC channel on Freenode.
64 * @section sec_website Website
66 * <a href="http://sigrok.org/wiki/Libsigrokdecode">sigrok.org/wiki/Libsigrokdecode</a>
72 * Initializing and shutting down libsigrokdecode.
76 * @defgroup grp_init Initialization
78 * Initializing and shutting down libsigrokdecode.
80 * Before using any of the libsigrokdecode functionality, srd_init() must
81 * be called to initialize the library.
83 * When libsigrokdecode functionality is no longer needed, srd_exit() should
89 /* List of decoder instances. */
90 static GSList *di_list = NULL;
92 /* List of frontend callbacks to receive decoder output. */
93 static GSList *callbacks = NULL;
98 extern SRD_PRIV GSList *pd_list;
100 /* module_sigrokdecode.c */
101 /* FIXME: SRD_PRIV causes issues on MinGW. Investigate. */
102 extern PyMODINIT_FUNC PyInit_sigrokdecode(void);
105 extern SRD_PRIV PyTypeObject srd_logic_type;
110 * Initialize libsigrokdecode.
112 * This initializes the Python interpreter, and creates and initializes
113 * a "sigrokdecode" Python module.
115 * Then, it searches for sigrok protocol decoder files (*.py) in the
116 * "decoders" subdirectory of the the sigrok installation directory.
117 * All decoders that are found are loaded into memory and added to an
118 * internal list of decoders, which can be queried via srd_decoders_list().
120 * The caller is responsible for calling the clean-up function srd_exit(),
121 * which will properly shut down libsigrokdecode and free its allocated memory.
123 * Multiple calls to srd_init(), without calling srd_exit() in between,
126 * @param path Path to an extra directory containing protocol decoders
127 * which will be added to the Python sys.path, or NULL.
129 * @return SRD_OK upon success, a (negative) error code otherwise.
130 * Upon Python errors, return SRD_ERR_PYTHON. If the sigrok decoders
131 * directory cannot be accessed, return SRD_ERR_DECODERS_DIR.
132 * If not enough memory could be allocated, return SRD_ERR_MALLOC.
134 SRD_API int srd_init(const char *path)
139 srd_dbg("Initializing libsigrokdecode.");
141 /* Add our own module to the list of built-in modules. */
142 PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode);
144 /* Initialize the Python interpreter. */
147 /* Installed decoders. */
148 if ((ret = srd_decoder_searchpath_add(DECODERS_DIR)) != SRD_OK) {
153 /* Path specified by the user. */
155 if ((ret = srd_decoder_searchpath_add(path)) != SRD_OK) {
161 /* Environment variable overrides everything, for debugging. */
162 if ((env_path = getenv("SIGROKDECODE_DIR"))) {
163 if ((ret = srd_decoder_searchpath_add(env_path)) != SRD_OK) {
173 * Shutdown libsigrokdecode.
175 * This frees all the memory allocated for protocol decoders and shuts down
176 * the Python interpreter.
178 * This function should only be called if there was a (successful!) invocation
179 * of srd_init() before. Calling this function multiple times in a row, without
180 * any successful srd_init() calls in between, is not allowed.
182 * @return SRD_OK upon success, a (negative) error code otherwise.
184 SRD_API int srd_exit(void)
186 srd_dbg("Exiting libsigrokdecode.");
188 srd_decoder_unload_all();
189 g_slist_free(pd_list);
192 /* Py_Finalize() returns void, any finalization errors are ignored. */
199 * Add an additional search directory for the protocol decoders.
201 * The specified directory is prepended (not appended!) to Python's sys.path,
202 * in order to search for sigrok protocol decoders in the specified
203 * directories first, and in the generic Python module directories (and in
204 * the current working directory) last. This avoids conflicts if there are
205 * Python modules which have the same name as a sigrok protocol decoder in
206 * sys.path or in the current working directory.
208 * @param path Path to the directory containing protocol decoders which shall
209 * be added to the Python sys.path, or NULL.
211 * @return SRD_OK upon success, a (negative) error code otherwise.
215 SRD_PRIV int srd_decoder_searchpath_add(const char *path)
217 PyObject *py_cur_path, *py_item;
220 wchar_t *wc_new_path;
223 srd_dbg("Adding '%s' to module path.", path);
225 new_path = g_string_sized_new(256);
226 g_string_assign(new_path, g_strdup(path));
227 py_cur_path = PySys_GetObject("path");
228 for (i = 0; i < PyList_Size(py_cur_path); i++) {
229 g_string_append(new_path, g_strdup(G_SEARCHPATH_SEPARATOR_S));
230 py_item = PyList_GetItem(py_cur_path, i);
231 if (!PyUnicode_Check(py_item))
232 /* Shouldn't happen. */
234 if (py_str_as_str(py_item, &item) != SRD_OK)
236 g_string_append(new_path, item);
239 /* Convert to wide chars. */
240 wc_len = sizeof(wchar_t) * (new_path->len + 1);
241 if (!(wc_new_path = g_try_malloc(wc_len))) {
242 srd_dbg("malloc failed");
243 return SRD_ERR_MALLOC;
245 mbstowcs(wc_new_path, new_path->str, wc_len);
246 PySys_SetPath(wc_new_path);
247 g_string_free(new_path, TRUE);
254 // * On Windows/MinGW, Python's sys.path needs entries of the form
255 // * 'C:\\foo\\bar' instead of '/foo/bar'.
258 // splitted = g_strsplit(DECODERS_DIR, "/", 0);
259 // path = g_build_pathv("\\\\", splitted);
260 // g_strfreev(splitted);
262 // path = g_strdup(DECODERS_DIR);
269 * Set one or more options in a decoder instance.
271 * Handled options are removed from the hash.
273 * @param di Decoder instance.
274 * @param options A GHashTable of options to set.
276 * @return SRD_OK upon success, a (negative) error code otherwise.
278 SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
281 PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval;
282 PyObject *py_optlist, *py_classval;
284 unsigned long long int val_ull;
285 int num_optkeys, ret, size, i;
288 if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) {
289 /* Decoder has no options. */
290 if (g_hash_table_size(options) == 0) {
291 /* No options provided. */
294 srd_err("Protocol decoder has no options.");
300 ret = SRD_ERR_PYTHON;
302 py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL;
303 py_optlist = py_classval = NULL;
304 py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options");
306 /* All of these are synthesized objects, so they're good. */
307 py_dec_optkeys = PyDict_Keys(py_dec_options);
308 num_optkeys = PyList_Size(py_dec_optkeys);
309 if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options")))
311 for (i = 0; i < num_optkeys; i++) {
312 /* Get the default class value for this option. */
313 py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key);
314 if (!(py_optlist = PyDict_GetItemString(py_dec_options, key)))
316 if (!(py_classval = PyList_GetItem(py_optlist, 1)))
318 if (!PyUnicode_Check(py_classval) && !PyLong_Check(py_classval)) {
319 srd_err("Options of type %s are not yet supported.",
320 Py_TYPE(py_classval)->tp_name);
324 if ((value = g_hash_table_lookup(options, key))) {
325 /* An override for this option was provided. */
326 if (PyUnicode_Check(py_classval)) {
327 if (!(py_optval = PyUnicode_FromString(value))) {
328 /* Some UTF-8 encoding error. */
332 } else if (PyLong_Check(py_classval)) {
333 if (!(py_optval = PyLong_FromString(value, NULL, 0))) {
334 /* ValueError Exception */
336 srd_err("Option %s has invalid value "
337 "%s: expected integer.",
342 g_hash_table_remove(options, key);
344 /* Use the class default for this option. */
345 if (PyUnicode_Check(py_classval)) {
346 /* Make a brand new copy of the string. */
347 py_ustr = PyUnicode_AS_UNICODE(py_classval);
348 size = PyUnicode_GET_SIZE(py_classval);
349 py_optval = PyUnicode_FromUnicode(py_ustr, size);
350 } else if (PyLong_Check(py_classval)) {
351 /* Make a brand new copy of the integer. */
352 val_ull = PyLong_AsUnsignedLongLong(py_classval);
353 if (val_ull == (unsigned long long)-1) {
354 /* OverFlowError exception */
356 srd_err("Invalid integer value for %s: "
357 "expected integer.", key);
360 if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull)))
366 * If we got here, py_optval holds a known good new reference
367 * to the instance option to set.
369 if (PyDict_SetItemString(py_di_options, key, py_optval) == -1)
376 Py_XDECREF(py_optlist);
377 Py_XDECREF(py_di_options);
378 Py_XDECREF(py_dec_optkeys);
379 Py_XDECREF(py_dec_options);
381 if (PyErr_Occurred())
382 srd_exception_catch("Stray exception in srd_inst_option_set().");
387 /* Helper GComparefunc for g_slist_find_custom() in srd_inst_probe_set_all() */
388 static gint compare_probe_id(const struct srd_probe *a, const char *probe_id)
390 return strcmp(a->id, probe_id);
394 * Set all probes in a decoder instance.
396 * This function sets _all_ probes for the specified decoder instance, i.e.,
397 * it overwrites any probes that were already defined (if any).
399 * @param di Decoder instance.
400 * @param new_probes A GHashTable of probes to set. Key is probe name, value is
401 * the probe number. Samples passed to this instance will be
402 * arranged in this order.
404 * @return SRD_OK upon success, a (negative) error code otherwise.
406 SRD_API int srd_inst_probe_set_all(struct srd_decoder_inst *di,
407 GHashTable *new_probes)
412 int *new_probemap, new_probenum;
413 char *probe_id, *probenum_str;
414 int i, num_required_probes;
416 srd_dbg("set probes called for instance %s with list of %d probes",
417 di->inst_id, g_hash_table_size(new_probes));
419 if (g_hash_table_size(new_probes) == 0)
420 /* No probes provided. */
423 if (di->dec_num_probes == 0) {
424 /* Decoder has no probes. */
425 srd_err("Protocol decoder %s has no probes to define.",
432 if (!(new_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) {
433 srd_err("Failed to g_malloc() new probe map.");
434 return SRD_ERR_MALLOC;
438 * For now, map all indexes to probe -1 (can be overridden later).
439 * This -1 is interpreted as an unspecified probe later.
441 for (i = 0; i < di->dec_num_probes; i++)
442 new_probemap[i] = -1;
444 for (l = g_hash_table_get_keys(new_probes); l; l = l->next) {
446 probenum_str = g_hash_table_lookup(new_probes, probe_id);
448 /* Probe name was specified without a value. */
449 srd_err("No probe number was specified for %s.",
451 g_free(new_probemap);
454 new_probenum = strtol(probenum_str, NULL, 10);
455 if (!(sl = g_slist_find_custom(di->decoder->probes, probe_id,
456 (GCompareFunc)compare_probe_id))) {
457 /* Fall back on optional probes. */
458 if (!(sl = g_slist_find_custom(di->decoder->opt_probes,
459 probe_id, (GCompareFunc) compare_probe_id))) {
460 srd_err("Protocol decoder %s has no probe "
461 "'%s'.", di->decoder->name, probe_id);
462 g_free(new_probemap);
467 new_probemap[p->order] = new_probenum;
468 srd_dbg("Setting probe mapping: %s (index %d) = probe %d.",
469 p->id, p->order, new_probenum);
472 srd_dbg("Final probe map:");
473 num_required_probes = g_slist_length(di->decoder->probes);
474 for (i = 0; i < di->dec_num_probes; i++) {
475 srd_dbg(" - index %d = probe %d (%s)", i, new_probemap[i],
476 (i < num_required_probes) ? "required" : "optional");
479 g_free(di->dec_probemap);
480 di->dec_probemap = new_probemap;
486 * Create a new protocol decoder instance.
488 * @param decoder_id Decoder 'id' field.
489 * @param options GHashtable of options which override the defaults set in
490 * the decoder class. May be NULL.
492 * @return Pointer to a newly allocated struct srd_decoder_inst, or
493 * NULL in case of failure.
495 SRD_API struct srd_decoder_inst *srd_inst_new(const char *decoder_id,
499 struct srd_decoder *dec;
500 struct srd_decoder_inst *di;
503 srd_dbg("Creating new %s instance.", decoder_id);
505 if (!(dec = srd_decoder_get_by_id(decoder_id))) {
506 srd_err("Protocol decoder %s not found.", decoder_id);
510 if (!(di = g_try_malloc0(sizeof(struct srd_decoder_inst)))) {
511 srd_err("Failed to g_malloc() instance.");
517 inst_id = g_hash_table_lookup(options, "id");
518 di->inst_id = g_strdup(inst_id ? inst_id : decoder_id);
519 g_hash_table_remove(options, "id");
521 di->inst_id = g_strdup(decoder_id);
524 * Prepare a default probe map, where samples come in the
525 * order in which the decoder class defined them.
527 di->dec_num_probes = g_slist_length(di->decoder->probes) +
528 g_slist_length(di->decoder->opt_probes);
529 if (di->dec_num_probes) {
530 if (!(di->dec_probemap =
531 g_try_malloc(sizeof(int) * di->dec_num_probes))) {
532 srd_err("Failed to g_malloc() probe map.");
536 for (i = 0; i < di->dec_num_probes; i++)
537 di->dec_probemap[i] = i;
540 /* Create a new instance of this decoder class. */
541 if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) {
542 if (PyErr_Occurred())
543 srd_exception_catch("failed to create %s instance: ",
545 g_free(di->dec_probemap);
550 if (options && srd_inst_option_set(di, options) != SRD_OK) {
551 g_free(di->dec_probemap);
556 /* Instance takes input from a frontend by default. */
557 di_list = g_slist_append(di_list, di);
563 * Stack a decoder instance on top of another.
565 * @param di_from The instance to move.
566 * @param di_to The instance on top of which di_from will be stacked.
568 * @return SRD_OK upon success, a (negative) error code otherwise.
570 SRD_API int srd_inst_stack(struct srd_decoder_inst *di_from,
571 struct srd_decoder_inst *di_to)
573 if (!di_from || !di_to) {
574 srd_err("Invalid from/to instance pair.");
578 if (g_slist_find(di_list, di_to)) {
579 /* Remove from the unstacked list. */
580 di_list = g_slist_remove(di_list, di_to);
583 /* Stack on top of source di. */
584 di_from->next_di = g_slist_append(di_from->next_di, di_to);
590 * Find a decoder instance by its instance ID.
592 * Only the bottom level of instances are searched -- instances already stacked
593 * on top of another one will not be found.
595 * @param inst_id The instance ID to be found.
597 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
599 SRD_API struct srd_decoder_inst *srd_inst_find_by_id(const char *inst_id)
602 struct srd_decoder_inst *tmp, *di;
605 for (l = di_list; l; l = l->next) {
607 if (!strcmp(tmp->inst_id, inst_id)) {
617 * Find a decoder instance by its Python object.
619 * I.e. find that instance's instantiation of the sigrokdecode.Decoder class.
620 * This will recurse to find the instance anywhere in the stack tree.
622 * @param stack Pointer to a GSList of struct srd_decoder_inst, indicating the
623 * stack to search. To start searching at the bottom level of
624 * decoder instances, pass NULL.
625 * @param obj The Python class instantiation.
627 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
631 SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(const GSList *stack,
636 struct srd_decoder_inst *tmp, *di;
639 for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) {
641 if (tmp->py_inst == obj)
643 else if (tmp->next_di)
644 di = srd_inst_find_by_obj(tmp->next_di, obj);
651 SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di, PyObject *args)
653 PyObject *py_name, *py_res;
655 struct srd_decoder_inst *next_di;
657 srd_dbg("Calling start() method on protocol decoder instance %s.",
660 if (!(py_name = PyUnicode_FromString("start"))) {
661 srd_err("Unable to build Python object for 'start'.");
662 srd_exception_catch("Protocol decoder instance %s: ",
664 return SRD_ERR_PYTHON;
667 if (!(py_res = PyObject_CallMethodObjArgs(di->py_inst,
668 py_name, args, NULL))) {
669 srd_exception_catch("Protocol decoder instance %s: ",
671 return SRD_ERR_PYTHON;
678 * Start all the PDs stacked on top of this one. Pass along the
679 * metadata all the way from the bottom PD, even though it's only
680 * applicable to logic data for now.
682 for (l = di->next_di; l; l = l->next) {
684 srd_inst_start(next_di, args);
691 * Run the specified decoder function.
693 * @param start_samplenum The starting sample number for the buffer's sample
694 * set, relative to the start of capture.
695 * @param di The decoder instance to call. Must not be NULL.
696 * @param inbuf The buffer to decode. Must not be NULL.
697 * @param inbuflen Length of the buffer. Must be > 0.
699 * @return SRD_OK upon success, a (negative) error code otherwise.
703 SRD_PRIV int srd_inst_decode(uint64_t start_samplenum,
704 const struct srd_decoder_inst *di,
705 const uint8_t *inbuf, uint64_t inbuflen)
709 uint64_t end_samplenum;
711 srd_dbg("Calling decode() on instance %s with %d bytes starting "
712 "at sample %d.", di->inst_id, inbuflen, start_samplenum);
714 /* Return an error upon unusable input. */
716 srd_dbg("empty decoder instance");
720 srd_dbg("NULL buffer pointer");
724 srd_dbg("empty buffer");
729 * Create new srd_logic object. Each iteration around the PD's loop
730 * will fill one sample into this object.
732 logic = PyObject_New(srd_logic, &srd_logic_type);
734 logic->di = (struct srd_decoder_inst *)di;
735 logic->start_samplenum = start_samplenum;
737 logic->inbuf = (uint8_t *)inbuf;
738 logic->inbuflen = inbuflen;
739 logic->sample = PyList_New(2);
740 Py_INCREF(logic->sample);
742 Py_IncRef(di->py_inst);
743 end_samplenum = start_samplenum + inbuflen / di->data_unitsize;
744 if (!(py_res = PyObject_CallMethod(di->py_inst, "decode",
745 "KKO", logic->start_samplenum,
746 end_samplenum, logic))) {
747 srd_exception_catch("Protocol decoder instance %s: ",
749 return SRD_ERR_PYTHON; /* TODO: More specific error? */
757 SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
760 struct srd_pd_output *pdo;
762 srd_dbg("Freeing instance %s", di->inst_id);
764 Py_DecRef(di->py_inst);
766 g_free(di->dec_probemap);
767 g_slist_free(di->next_di);
768 for (l = di->pd_output; l; l = l->next) {
770 g_free(pdo->proto_id);
773 g_slist_free(di->pd_output);
777 SRD_PRIV void srd_inst_free_all(GSList *stack)
780 struct srd_decoder_inst *di;
783 for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) {
786 srd_inst_free_all(di->next_di);
790 g_slist_free(di_list);
796 * Start a decoding session.
798 * Decoders, instances and stack must have been prepared beforehand.
800 * @param num_probes The number of probes which the incoming feed will contain.
801 * @param unitsize The number of bytes per sample in the incoming feed.
802 * @param samplerate The samplerate of the incoming feed.
804 * @return SRD_OK upon success, a (negative) error code otherwise.
806 SRD_API int srd_session_start(int num_probes, int unitsize, uint64_t samplerate)
810 struct srd_decoder_inst *di;
815 srd_dbg("Calling start() on all instances with %d probes, "
816 "unitsize %d samplerate %d.", num_probes, unitsize, samplerate);
819 * Currently only one item of metadata is passed along to decoders,
820 * samplerate. This can be extended as needed.
822 if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) {
823 srd_err("Unable to build Python object for metadata.");
824 return SRD_ERR_PYTHON;
827 /* Run the start() method on all decoders receiving frontend data. */
828 for (d = di_list; d; d = d->next) {
830 di->data_num_probes = num_probes;
831 di->data_unitsize = unitsize;
832 di->data_samplerate = samplerate;
833 if ((ret = srd_inst_start(di, args)) != SRD_OK)
843 * Send a chunk of logic sample data to a running decoder session.
845 * @param start_samplenum The sample number of the first sample in this chunk.
846 * @param inbuf Pointer to sample data.
847 * @param inbuflen Length in bytes of the buffer.
849 * @return SRD_OK upon success, a (negative) error code otherwise.
851 SRD_API int srd_session_send(uint64_t start_samplenum, const uint8_t *inbuf,
857 srd_dbg("Calling decode() on all instances with starting sample "
858 "number %" PRIu64 ", %" PRIu64 " bytes at 0x%p",
859 start_samplenum, inbuflen, inbuf);
861 for (d = di_list; d; d = d->next) {
862 if ((ret = srd_inst_decode(start_samplenum, d->data, inbuf,
863 inbuflen)) != SRD_OK)
871 * Register/add a decoder output callback function.
873 * The function will be called when a protocol decoder sends output back
874 * to the PD controller (except for Python objects, which only go up the
877 * @param output_type The output type this callback will receive. Only one
878 * callback per output type can be registered.
879 * @param cb The function to call. Must not be NULL.
880 * @param cb_data Private data for the callback function. Can be NULL.
882 SRD_API int srd_pd_output_callback_add(int output_type,
883 srd_pd_output_callback_t cb, void *cb_data)
885 struct srd_pd_callback *pd_cb;
887 srd_dbg("Registering new callback for output type %d.", output_type);
889 if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) {
890 srd_err("Failed to g_malloc() struct srd_pd_callback.");
891 return SRD_ERR_MALLOC;
894 pd_cb->output_type = output_type;
896 pd_cb->cb_data = cb_data;
897 callbacks = g_slist_append(callbacks, pd_cb);
903 SRD_PRIV void *srd_pd_output_callback_find(int output_type)
906 struct srd_pd_callback *pd_cb;
910 for (l = callbacks; l; l = l->next) {
912 if (pd_cb->output_type == output_type) {
921 /* This is the backend function to Python sigrokdecode.add() call. */
923 SRD_PRIV int srd_inst_pd_output_add(struct srd_decoder_inst *di,
924 int output_type, const char *proto_id)
926 struct srd_pd_output *pdo;
928 srd_dbg("Instance %s creating new output type %d for %s.",
929 di->inst_id, output_type, proto_id);
931 if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) {
932 srd_err("Failed to g_malloc() struct srd_pd_output.");
936 /* pdo_id is just a simple index, nothing is deleted from this list anyway. */
937 pdo->pdo_id = g_slist_length(di->pd_output);
938 pdo->output_type = output_type;
940 pdo->proto_id = g_strdup(proto_id);
941 di->pd_output = g_slist_append(di->pd_output, pdo);