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"
28 /* List of decoder instances. */
29 static GSList *di_list = NULL;
31 /* List of frontend callbacks to receive PD output. */
32 static GSList *callbacks = NULL;
35 extern SRD_PRIV GSList *pd_list;
37 /* module_sigrokdecode.c */
38 extern SRD_PRIV PyMODINIT_FUNC PyInit_sigrokdecode(void);
41 extern SRD_PRIV PyTypeObject srd_logic_type;
44 * Initialize libsigrokdecode.
46 * This initializes the Python interpreter, and creates and initializes
47 * a "sigrok" Python module with a single put() method.
49 * Then, it searches for sigrok protocol decoder files (*.py) in the
50 * "decoders" subdirectory of the the sigrok installation directory.
51 * All decoders that are found are loaded into memory and added to an
52 * internal list of decoders, which can be queried via srd_list_decoders().
54 * The caller is responsible for calling the clean-up function srd_exit(),
55 * which will properly shut down libsigrokdecode and free its allocated memory.
57 * Multiple calls to srd_init(), without calling srd_exit() in between,
60 * @param path Path to an extra directory containing protocol decoders
61 * which will be added to the python sys.path, or NULL.
63 * @return SRD_OK upon success, a (negative) error code otherwise.
64 * Upon Python errors, return SRD_ERR_PYTHON. If the sigrok decoders
65 * directory cannot be accessed, return SRD_ERR_DECODERS_DIR.
66 * If not enough memory could be allocated, return SRD_ERR_MALLOC.
68 SRD_API int srd_init(char *path)
73 srd_dbg("Initializing libsigrokdecode.");
75 /* Add our own module to the list of built-in modules. */
76 PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode);
78 /* Initialize the Python interpreter. */
81 /* Installed decoders. */
82 if ((ret = add_modulepath(DECODERS_DIR)) != SRD_OK) {
87 /* Path specified by the user. */
89 if ((ret = add_modulepath(path)) != SRD_OK) {
95 /* Environment variable overrides everything, for debugging. */
96 if ((env_path = getenv("SIGROKDECODE_DIR"))) {
97 if ((ret = add_modulepath(path)) != SRD_OK) {
103 if ((ret = srd_load_all_decoders()) != SRD_OK) {
112 * Shutdown libsigrokdecode.
114 * This frees all the memory allocated for protocol decoders and shuts down
115 * the Python interpreter.
117 * This function should only be called if there was a (successful!) invocation
118 * of srd_init() before. Calling this function multiple times in a row, without
119 * any successful srd_init() calls in between, is not allowed.
121 * @return SRD_OK upon success, a (negative) error code otherwise.
123 SRD_API int srd_exit(void)
125 srd_dbg("Exiting libsigrokdecode.");
127 srd_unload_all_decoders();
128 g_slist_free(pd_list);
130 /* Py_Finalize() returns void, any finalization errors are ignored. */
137 * Add an additional search directory for the protocol decoders.
139 * The specified directory is prepended (not appended!) to Python's sys.path,
140 * in order to search for sigrok protocol decoders in the specified
141 * directories first, and in the generic Python module directories (and in
142 * the current working directory) last. This avoids conflicts if there are
143 * Python modules which have the same name as a sigrok protocol decoder in
144 * sys.path or in the current working directory.
146 * @param path Path to an extra directory containing protocol decoders
147 * which will be added to the python sys.path, or NULL.
149 * @return SRD_OK upon success, a (negative) error code otherwise.
151 SRD_PRIV int add_modulepath(const char *path)
153 PyObject *py_cur_path, *py_item;
156 wchar_t *wc_new_path;
159 srd_dbg("adding %s to module path", path);
161 new_path = g_string_sized_new(256);
162 g_string_assign(new_path, g_strdup(path));
163 py_cur_path = PySys_GetObject("path");
164 for (i = 0; i < PyList_Size(py_cur_path); i++) {
165 g_string_append(new_path, g_strdup(G_SEARCHPATH_SEPARATOR_S));
166 py_item = PyList_GetItem(py_cur_path, i);
167 if (!PyUnicode_Check(py_item))
168 /* Shouldn't happen. */
170 if (py_str_as_str(py_item, &item) != SRD_OK)
172 g_string_append(new_path, item);
175 /* Convert to wide chars. */
176 wc_len = sizeof(wchar_t) * (new_path->len + 1);
177 if (!(wc_new_path = g_try_malloc(wc_len))) {
178 srd_dbg("malloc failed");
179 return SRD_ERR_MALLOC;
181 mbstowcs(wc_new_path, new_path->str, wc_len);
182 PySys_SetPath(wc_new_path);
183 g_string_free(new_path, TRUE);
190 // * On Windows/MinGW, Python's sys.path needs entries of the form
191 // * 'C:\\foo\\bar' instead of '/foo/bar'.
194 // splitted = g_strsplit(DECODERS_DIR, "/", 0);
195 // path = g_build_pathv("\\\\", splitted);
196 // g_strfreev(splitted);
198 // path = g_strdup(DECODERS_DIR);
205 * Set options in a decoder instance.
207 * @param di Decoder instance.
208 * @param options A GHashTable of options to set.
210 * Handled options are removed from the hash.
212 * @return SRD_OK upon success, a (negative) error code otherwise.
214 SRD_API int srd_inst_set_options(struct srd_decoder_inst *di,
217 PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval;
218 PyObject *py_optlist, *py_classval;
220 unsigned long long int val_ull;
221 int num_optkeys, ret, size, i;
224 if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) {
225 /* Decoder has no options. */
226 if (g_hash_table_size(options) == 0) {
227 /* No options provided. */
230 srd_err("Protocol decoder has no options.");
236 ret = SRD_ERR_PYTHON;
238 py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL;
239 py_optlist = py_classval = NULL;
240 py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options");
242 /* All of these are synthesized objects, so they're good. */
243 py_dec_optkeys = PyDict_Keys(py_dec_options);
244 num_optkeys = PyList_Size(py_dec_optkeys);
245 if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options")))
247 for (i = 0; i < num_optkeys; i++) {
248 /* Get the default class value for this option. */
249 py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key);
250 if (!(py_optlist = PyDict_GetItemString(py_dec_options, key)))
252 if (!(py_classval = PyList_GetItem(py_optlist, 1)))
254 if (!PyUnicode_Check(py_classval) && !PyLong_Check(py_classval)) {
255 srd_err("Options of type %s are not yet supported.",
256 Py_TYPE(py_classval)->tp_name);
260 if ((value = g_hash_table_lookup(options, key))) {
261 /* An override for this option was provided. */
262 if (PyUnicode_Check(py_classval)) {
263 if (!(py_optval = PyUnicode_FromString(value))) {
264 /* Some UTF-8 encoding error. */
268 } else if (PyLong_Check(py_classval)) {
269 if (!(py_optval = PyLong_FromString(value, NULL, 0))) {
270 /* ValueError Exception */
272 srd_err("Option %s has invalid value "
273 "%s: expected integer.",
278 g_hash_table_remove(options, key);
280 /* Use the class default for this option. */
281 if (PyUnicode_Check(py_classval)) {
282 /* Make a brand new copy of the string. */
283 py_ustr = PyUnicode_AS_UNICODE(py_classval);
284 size = PyUnicode_GET_SIZE(py_classval);
285 py_optval = PyUnicode_FromUnicode(py_ustr, size);
286 } else if (PyLong_Check(py_classval)) {
287 /* Make a brand new copy of the integer. */
288 val_ull = PyLong_AsUnsignedLongLong(py_classval);
289 if (val_ull == (unsigned long long)-1) {
290 /* OverFlowError exception */
292 srd_err("Invalid integer value for %s: "
293 "expected integer.", key);
296 if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull)))
301 /* If we got here, py_optval holds a known good new reference
302 * to the instance option to set.
304 if (PyDict_SetItemString(py_di_options, key, py_optval) == -1)
311 Py_XDECREF(py_optlist);
312 Py_XDECREF(py_di_options);
313 Py_XDECREF(py_dec_optkeys);
314 Py_XDECREF(py_dec_options);
316 if (PyErr_Occurred())
317 catch_exception("Stray exception in srd_inst_set_options().");
322 /* Helper GComparefunc for g_slist_find_custom() in srd_inst_set_probes() */
323 static gint compare_probe_id(struct srd_probe *a, char *probe_id)
325 return strcmp(a->id, probe_id);
329 * Set probes in a decoder instance.
331 * @param di Decoder instance.
332 * @param probes A GHashTable of probes to set. Key is probe name, value is
333 * the probe number. Samples passed to this instance will be
334 * arranged in this order.
336 * @return SRD_OK upon success, a (negative) error code otherwise.
338 SRD_API int srd_inst_set_probes(struct srd_decoder_inst *di,
339 GHashTable *new_probes)
344 int *new_probemap, new_probenum;
345 char *probe_id, *probenum_str;
347 srd_dbg("set probes called for instance %s with list of %d probes",
348 di->inst_id, g_hash_table_size(new_probes));
350 if (g_hash_table_size(new_probes) == 0)
351 /* No probes provided. */
354 if (di->dec_num_probes == 0) {
355 /* Decoder has no probes. */
356 srd_err("Protocol decoder %s has no probes to define.",
363 if (!(new_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) {
364 srd_err("Failed to g_malloc() new probe map.");
365 return SRD_ERR_MALLOC;
368 for (l = g_hash_table_get_keys(new_probes); l; l = l->next) {
370 probenum_str = g_hash_table_lookup(new_probes, probe_id);
372 /* Probe name was specified without a value. */
373 srd_err("No probe number was specified for %s.",
375 g_free(new_probemap);
378 new_probenum = strtol(probenum_str, NULL, 10);
379 if (!(sl = g_slist_find_custom(di->decoder->probes, probe_id,
380 (GCompareFunc)compare_probe_id))) {
381 /* Fall back on optional probes. */
382 if (!(sl = g_slist_find_custom(di->decoder->opt_probes,
383 probe_id, (GCompareFunc) compare_probe_id))) {
384 srd_err("Protocol decoder %s has no probe "
385 "'%s'.", di->decoder->name, probe_id);
386 g_free(new_probemap);
391 new_probemap[p->order] = new_probenum;
392 srd_dbg("setting probe mapping for %d = probe %d", p->order,
395 g_free(di->dec_probemap);
396 di->dec_probemap = new_probemap;
402 * Create a new protocol decoder instance.
404 * @param id Decoder 'id' field.
405 * @param options GHashtable of options which override the defaults set in
408 * @return Pointer to a newly allocated struct srd_decoder_inst, or
409 * NULL in case of failure.
411 SRD_API struct srd_decoder_inst *srd_inst_new(const char *decoder_id,
415 struct srd_decoder *dec;
416 struct srd_decoder_inst *di;
419 srd_dbg("Creating new %s instance.", decoder_id);
421 if (!(dec = srd_get_decoder_by_id(decoder_id))) {
422 srd_err("Protocol decoder %s not found.", decoder_id);
426 if (!(di = g_try_malloc0(sizeof(struct srd_decoder_inst)))) {
427 srd_err("Failed to g_malloc() instance.");
431 inst_id = g_hash_table_lookup(options, "id");
433 di->inst_id = g_strdup(inst_id ? inst_id : decoder_id);
434 g_hash_table_remove(options, "id");
436 /* Prepare a default probe map, where samples come in the
437 * order in which the decoder class defined them.
439 di->dec_num_probes = g_slist_length(di->decoder->probes) +
440 g_slist_length(di->decoder->opt_probes);
441 if (di->dec_num_probes) {
442 if (!(di->dec_probemap =
443 g_try_malloc(sizeof(int) * di->dec_num_probes))) {
444 srd_err("Failed to g_malloc() probe map.");
448 for (i = 0; i < di->dec_num_probes; i++)
449 di->dec_probemap[i] = i;
452 /* Create a new instance of this decoder class. */
453 if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) {
454 if (PyErr_Occurred())
455 catch_exception("failed to create %s instance: ",
457 g_free(di->dec_probemap);
462 if (srd_inst_set_options(di, options) != SRD_OK) {
463 g_free(di->dec_probemap);
468 /* Instance takes input from a frontend by default. */
469 di_list = g_slist_append(di_list, di);
475 * Stack a decoder instance on top of another.
477 * @param di_from The instance to move.
478 * @param di_to The instance on top of which di_from will be stacked.
480 * @return SRD_OK upon success, a (negative) error code otherwise.
482 SRD_API int srd_inst_stack(struct srd_decoder_inst *di_from,
483 struct srd_decoder_inst *di_to)
485 if (!di_from || !di_to) {
486 srd_err("Invalid from/to instance pair.");
490 if (g_slist_find(di_list, di_to)) {
491 /* Remove from the unstacked list. */
492 di_list = g_slist_remove(di_list, di_to);
495 /* Stack on top of source di. */
496 di_from->next_di = g_slist_append(di_from->next_di, di_to);
502 * Finds a decoder instance by its instance id, but only in the bottom
503 * level of instances -- instances already stacked on top of another one
506 * @param inst_id The instance id to be found.
508 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
510 SRD_API struct srd_decoder_inst *srd_inst_find_by_id(char *inst_id)
513 struct srd_decoder_inst *tmp, *di;
516 for (l = di_list; l; l = l->next) {
518 if (!strcmp(tmp->inst_id, inst_id)) {
528 * Finds a decoder instance by its Python object, i.e. that instance's
529 * instantiation of the sigrokdecode.Decoder class. This will recurse
530 * to find the instance anywhere in the stack tree.
532 * @param stack Pointer to a GSList of struct srd_decoder_inst,
533 * indicating the stack to search. To start searching at the bottom
534 * level of decoder instances, pass NULL.
535 * @param obj The Python class instantiation.
537 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
539 SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(GSList *stack,
543 struct srd_decoder_inst *tmp, *di;
546 for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) {
548 if (tmp->py_inst == obj)
550 else if (tmp->next_di)
551 di = srd_inst_find_by_obj(tmp->next_di, obj);
557 SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di, PyObject *args)
559 PyObject *py_name, *py_res;
561 struct srd_decoder_inst *next_di;
563 srd_dbg("Calling start() method on protocol decoder instance %s.",
566 if (!(py_name = PyUnicode_FromString("start"))) {
567 srd_err("Unable to build Python object for 'start'.");
568 catch_exception("Protocol decoder instance %s: ",
570 return SRD_ERR_PYTHON;
573 if (!(py_res = PyObject_CallMethodObjArgs(di->py_inst,
574 py_name, args, NULL))) {
575 catch_exception("Protocol decoder instance %s: ",
577 return SRD_ERR_PYTHON;
583 /* Start all the PDs stacked on top of this one. Pass along the
584 * metadata all the way from the bottom PD, even though it's only
585 * applicable to logic data for now.
587 for (l = di->next_di; l; l = l->next) {
589 srd_inst_start(next_di, args);
596 * Run the specified decoder function.
598 * @param start_samplenum The starting sample number for the buffer's sample
599 * set, relative to the start of capture.
600 * @param di The decoder instance to call. Must not be NULL.
601 * @param inbuf The buffer to decode. Must not be NULL.
602 * @param inbuflen Length of the buffer. Must be > 0.
604 * @return SRD_OK upon success, a (negative) error code otherwise.
606 SRD_PRIV int srd_inst_decode(uint64_t start_samplenum,
607 struct srd_decoder_inst *di,
608 uint8_t *inbuf, uint64_t inbuflen)
612 uint64_t end_samplenum;
614 srd_dbg("Calling decode() on instance %s with %d bytes starting "
615 "at sample %d.", di->inst_id, inbuflen, start_samplenum);
617 /* Return an error upon unusable input. */
619 srd_dbg("empty decoder instance");
623 srd_dbg("NULL buffer pointer");
627 srd_dbg("empty buffer");
631 /* Create new srd_logic object. Each iteration around the PD's loop
632 * will fill one sample into this object.
634 logic = PyObject_New(srd_logic, &srd_logic_type);
637 logic->start_samplenum = start_samplenum;
639 logic->inbuf = inbuf;
640 logic->inbuflen = inbuflen;
641 logic->sample = PyList_New(2);
642 Py_INCREF(logic->sample);
644 Py_IncRef(di->py_inst);
645 end_samplenum = start_samplenum + inbuflen / di->data_unitsize;
646 if (!(py_res = PyObject_CallMethod(di->py_inst, "decode",
647 "KKO", logic->start_samplenum,
648 end_samplenum, logic))) {
649 catch_exception("Protocol decoder instance %s: ",
651 return SRD_ERR_PYTHON; /* TODO: More specific error? */
658 SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
661 struct srd_pd_output *pdo;
663 srd_dbg("Freeing instance %s", di->inst_id);
665 Py_DecRef(di->py_inst);
667 g_free(di->dec_probemap);
668 g_slist_free(di->next_di);
669 for (l = di->pd_output; l; l = l->next) {
671 g_free(pdo->proto_id);
674 g_slist_free(di->pd_output);
677 SRD_PRIV void srd_inst_free_all(GSList *stack)
680 struct srd_decoder_inst *di;
683 for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) {
686 srd_inst_free_all(di->next_di);
690 g_slist_free(di_list);
696 * Start a decoding session.
698 * Decoders, instances and stack must have been prepared beforehand.
700 * @param num_probes The number of probes which the incoming feed will contain.
701 * @param unitsize The number of bytes per sample in the incoming feed.
702 * @param The samplerate of the incoming feed.
704 * @return SRD_OK upon success, a (negative) error code otherwise.
706 SRD_API int srd_session_start(int num_probes, int unitsize, uint64_t samplerate)
710 struct srd_decoder_inst *di;
713 srd_dbg("Calling start() on all instances with %d probes, "
714 "unitsize %d samplerate %d.", num_probes, unitsize, samplerate);
716 /* Currently only one item of metadata is passed along to decoders,
717 * samplerate. This can be extended as needed.
719 if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) {
720 srd_err("Unable to build Python object for metadata.");
721 return SRD_ERR_PYTHON;
724 /* Run the start() method on all decoders receiving frontend data. */
725 for (d = di_list; d; d = d->next) {
727 di->data_num_probes = num_probes;
728 di->data_unitsize = unitsize;
729 di->data_samplerate = samplerate;
730 if ((ret = srd_inst_start(di, args) != SRD_OK))
740 * Feed a chunk of logic sample data to a running decoder session.
742 * @param start_samplenum The sample number of the first sample in this chunk.
743 * @param inbuf Pointer to sample data.
744 * @param inbuf Length in bytes of the buffer.
746 * @return SRD_OK upon success, a (negative) error code otherwise.
748 SRD_API int srd_session_feed(uint64_t start_samplenum, uint8_t *inbuf,
754 srd_dbg("Calling decode() on all instances with starting sample "
755 "number %" PRIu64 ", %" PRIu64 " bytes at 0x%p",
756 start_samplenum, inbuflen, inbuf);
758 for (d = di_list; d; d = d->next) {
759 if ((ret = srd_inst_decode(start_samplenum, d->data, inbuf,
760 inbuflen)) != SRD_OK)
768 * Register a decoder output callback function.
770 * The function will be called when a protocol decoder sends output back
771 * to the PD controller (except for Python objects, which only go up the
774 * @param output_type The output type this callback will receive. Only one
775 * callback per output type can be registered.
776 * @param cb The function to call.
777 * @param user_data Unused.
779 SRD_API int srd_register_callback(int output_type,
780 srd_pd_output_callback_t cb, void *user_data)
782 struct srd_pd_callback *pd_cb;
784 srd_dbg("Registering new callback for output type %d.", output_type);
786 if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) {
787 srd_err("Failed to g_malloc() struct srd_pd_callback.");
788 return SRD_ERR_MALLOC;
791 pd_cb->output_type = output_type;
792 pd_cb->callback = cb;
793 pd_cb->user_data = user_data;
794 callbacks = g_slist_append(callbacks, pd_cb);
799 SRD_PRIV void *srd_find_callback(int output_type)
802 struct srd_pd_callback *pd_cb;
806 for (l = callbacks; l; l = l->next) {
808 if (pd_cb->output_type == output_type) {
809 cb = pd_cb->callback;
817 /* This is the backend function to Python sigrokdecode.add() call. */
818 SRD_PRIV int pd_add(struct srd_decoder_inst *di, int output_type,
821 struct srd_pd_output *pdo;
823 srd_dbg("Instance %s creating new output type %d for %s.",
824 di->inst_id, output_type, proto_id);
826 if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) {
827 srd_err("Failed to g_malloc() struct srd_pd_output.");
831 /* pdo_id is just a simple index, nothing is deleted from this list anyway. */
832 pdo->pdo_id = g_slist_length(di->pd_output);
833 pdo->output_type = output_type;
835 pdo->proto_id = g_strdup(proto_id);
836 di->pd_output = g_slist_append(di->pd_output, pdo);