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 decoder 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 "sigrokdecode" Python module.
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_decoders_list().
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(const 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(env_path)) != SRD_OK) {
107 * Shutdown libsigrokdecode.
109 * This frees all the memory allocated for protocol decoders and shuts down
110 * the Python interpreter.
112 * This function should only be called if there was a (successful!) invocation
113 * of srd_init() before. Calling this function multiple times in a row, without
114 * any successful srd_init() calls in between, is not allowed.
116 * @return SRD_OK upon success, a (negative) error code otherwise.
118 SRD_API int srd_exit(void)
120 srd_dbg("Exiting libsigrokdecode.");
122 srd_decoder_unload_all();
123 g_slist_free(pd_list);
126 /* Py_Finalize() returns void, any finalization errors are ignored. */
133 * Add an additional search directory for the protocol decoders.
135 * The specified directory is prepended (not appended!) to Python's sys.path,
136 * in order to search for sigrok protocol decoders in the specified
137 * directories first, and in the generic Python module directories (and in
138 * the current working directory) last. This avoids conflicts if there are
139 * Python modules which have the same name as a sigrok protocol decoder in
140 * sys.path or in the current working directory.
142 * @param path Path to the directory containing protocol decoders which shall
143 * be added to the Python sys.path, or NULL.
145 * @return SRD_OK upon success, a (negative) error code otherwise.
147 SRD_PRIV int add_modulepath(const char *path)
149 PyObject *py_cur_path, *py_item;
152 wchar_t *wc_new_path;
155 srd_dbg("Adding '%s' to module path.", path);
157 new_path = g_string_sized_new(256);
158 g_string_assign(new_path, g_strdup(path));
159 py_cur_path = PySys_GetObject("path");
160 for (i = 0; i < PyList_Size(py_cur_path); i++) {
161 g_string_append(new_path, g_strdup(G_SEARCHPATH_SEPARATOR_S));
162 py_item = PyList_GetItem(py_cur_path, i);
163 if (!PyUnicode_Check(py_item))
164 /* Shouldn't happen. */
166 if (py_str_as_str(py_item, &item) != SRD_OK)
168 g_string_append(new_path, item);
171 /* Convert to wide chars. */
172 wc_len = sizeof(wchar_t) * (new_path->len + 1);
173 if (!(wc_new_path = g_try_malloc(wc_len))) {
174 srd_dbg("malloc failed");
175 return SRD_ERR_MALLOC;
177 mbstowcs(wc_new_path, new_path->str, wc_len);
178 PySys_SetPath(wc_new_path);
179 g_string_free(new_path, TRUE);
186 // * On Windows/MinGW, Python's sys.path needs entries of the form
187 // * 'C:\\foo\\bar' instead of '/foo/bar'.
190 // splitted = g_strsplit(DECODERS_DIR, "/", 0);
191 // path = g_build_pathv("\\\\", splitted);
192 // g_strfreev(splitted);
194 // path = g_strdup(DECODERS_DIR);
201 * Set options in a decoder instance.
203 * Handled options are removed from the hash.
205 * @param di Decoder instance.
206 * @param options A GHashTable of options to set.
208 * @return SRD_OK upon success, a (negative) error code otherwise.
210 SRD_API int srd_inst_options_set(struct srd_decoder_inst *di,
213 PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval;
214 PyObject *py_optlist, *py_classval;
216 unsigned long long int val_ull;
217 int num_optkeys, ret, size, i;
220 if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) {
221 /* Decoder has no options. */
222 if (g_hash_table_size(options) == 0) {
223 /* No options provided. */
226 srd_err("Protocol decoder has no options.");
232 ret = SRD_ERR_PYTHON;
234 py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL;
235 py_optlist = py_classval = NULL;
236 py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options");
238 /* All of these are synthesized objects, so they're good. */
239 py_dec_optkeys = PyDict_Keys(py_dec_options);
240 num_optkeys = PyList_Size(py_dec_optkeys);
241 if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options")))
243 for (i = 0; i < num_optkeys; i++) {
244 /* Get the default class value for this option. */
245 py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key);
246 if (!(py_optlist = PyDict_GetItemString(py_dec_options, key)))
248 if (!(py_classval = PyList_GetItem(py_optlist, 1)))
250 if (!PyUnicode_Check(py_classval) && !PyLong_Check(py_classval)) {
251 srd_err("Options of type %s are not yet supported.",
252 Py_TYPE(py_classval)->tp_name);
256 if ((value = g_hash_table_lookup(options, key))) {
257 /* An override for this option was provided. */
258 if (PyUnicode_Check(py_classval)) {
259 if (!(py_optval = PyUnicode_FromString(value))) {
260 /* Some UTF-8 encoding error. */
264 } else if (PyLong_Check(py_classval)) {
265 if (!(py_optval = PyLong_FromString(value, NULL, 0))) {
266 /* ValueError Exception */
268 srd_err("Option %s has invalid value "
269 "%s: expected integer.",
274 g_hash_table_remove(options, key);
276 /* Use the class default for this option. */
277 if (PyUnicode_Check(py_classval)) {
278 /* Make a brand new copy of the string. */
279 py_ustr = PyUnicode_AS_UNICODE(py_classval);
280 size = PyUnicode_GET_SIZE(py_classval);
281 py_optval = PyUnicode_FromUnicode(py_ustr, size);
282 } else if (PyLong_Check(py_classval)) {
283 /* Make a brand new copy of the integer. */
284 val_ull = PyLong_AsUnsignedLongLong(py_classval);
285 if (val_ull == (unsigned long long)-1) {
286 /* OverFlowError exception */
288 srd_err("Invalid integer value for %s: "
289 "expected integer.", key);
292 if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull)))
298 * If we got here, py_optval holds a known good new reference
299 * to the instance option to set.
301 if (PyDict_SetItemString(py_di_options, key, py_optval) == -1)
308 Py_XDECREF(py_optlist);
309 Py_XDECREF(py_di_options);
310 Py_XDECREF(py_dec_optkeys);
311 Py_XDECREF(py_dec_options);
313 if (PyErr_Occurred())
314 catch_exception("Stray exception in srd_inst_set_options().");
319 /* Helper GComparefunc for g_slist_find_custom() in srd_inst_probes_set() */
320 static gint compare_probe_id(const struct srd_probe *a, const char *probe_id)
322 return strcmp(a->id, probe_id);
326 * Set probes in a decoder instance.
328 * @param di Decoder instance.
329 * @param probes A GHashTable of probes to set. Key is probe name, value is
330 * the probe number. Samples passed to this instance will be
331 * arranged in this order.
333 * @return SRD_OK upon success, a (negative) error code otherwise.
335 SRD_API int srd_inst_probes_set(struct srd_decoder_inst *di,
336 GHashTable *new_probes)
341 int *new_probemap, new_probenum;
342 char *probe_id, *probenum_str;
344 srd_dbg("set probes called for instance %s with list of %d probes",
345 di->inst_id, g_hash_table_size(new_probes));
347 if (g_hash_table_size(new_probes) == 0)
348 /* No probes provided. */
351 if (di->dec_num_probes == 0) {
352 /* Decoder has no probes. */
353 srd_err("Protocol decoder %s has no probes to define.",
360 if (!(new_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) {
361 srd_err("Failed to g_malloc() new probe map.");
362 return SRD_ERR_MALLOC;
365 for (l = g_hash_table_get_keys(new_probes); l; l = l->next) {
367 probenum_str = g_hash_table_lookup(new_probes, probe_id);
369 /* Probe name was specified without a value. */
370 srd_err("No probe number was specified for %s.",
372 g_free(new_probemap);
375 new_probenum = strtol(probenum_str, NULL, 10);
376 if (!(sl = g_slist_find_custom(di->decoder->probes, probe_id,
377 (GCompareFunc)compare_probe_id))) {
378 /* Fall back on optional probes. */
379 if (!(sl = g_slist_find_custom(di->decoder->opt_probes,
380 probe_id, (GCompareFunc) compare_probe_id))) {
381 srd_err("Protocol decoder %s has no probe "
382 "'%s'.", di->decoder->name, probe_id);
383 g_free(new_probemap);
388 new_probemap[p->order] = new_probenum;
389 srd_dbg("setting probe mapping for %d = probe %d", p->order,
392 g_free(di->dec_probemap);
393 di->dec_probemap = new_probemap;
399 * Create a new protocol decoder instance.
401 * @param id Decoder 'id' field.
402 * @param options GHashtable of options which override the defaults set in
405 * @return Pointer to a newly allocated struct srd_decoder_inst, or
406 * NULL in case of failure.
408 SRD_API struct srd_decoder_inst *srd_inst_new(const char *decoder_id,
412 struct srd_decoder *dec;
413 struct srd_decoder_inst *di;
416 srd_dbg("Creating new %s instance.", decoder_id);
418 if (!(dec = srd_decoder_get_by_id(decoder_id))) {
419 srd_err("Protocol decoder %s not found.", decoder_id);
423 if (!(di = g_try_malloc0(sizeof(struct srd_decoder_inst)))) {
424 srd_err("Failed to g_malloc() instance.");
428 inst_id = g_hash_table_lookup(options, "id");
430 di->inst_id = g_strdup(inst_id ? inst_id : decoder_id);
431 g_hash_table_remove(options, "id");
434 * Prepare a default probe map, where samples come in the
435 * order in which the decoder class defined them.
437 di->dec_num_probes = g_slist_length(di->decoder->probes) +
438 g_slist_length(di->decoder->opt_probes);
439 if (di->dec_num_probes) {
440 if (!(di->dec_probemap =
441 g_try_malloc(sizeof(int) * di->dec_num_probes))) {
442 srd_err("Failed to g_malloc() probe map.");
446 for (i = 0; i < di->dec_num_probes; i++)
447 di->dec_probemap[i] = i;
450 /* Create a new instance of this decoder class. */
451 if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) {
452 if (PyErr_Occurred())
453 catch_exception("failed to create %s instance: ",
455 g_free(di->dec_probemap);
460 if (srd_inst_options_set(di, options) != SRD_OK) {
461 g_free(di->dec_probemap);
466 /* Instance takes input from a frontend by default. */
467 di_list = g_slist_append(di_list, di);
473 * Stack a decoder instance on top of another.
475 * @param di_from The instance to move.
476 * @param di_to The instance on top of which di_from will be stacked.
478 * @return SRD_OK upon success, a (negative) error code otherwise.
480 SRD_API int srd_inst_stack(struct srd_decoder_inst *di_from,
481 struct srd_decoder_inst *di_to)
483 if (!di_from || !di_to) {
484 srd_err("Invalid from/to instance pair.");
488 if (g_slist_find(di_list, di_to)) {
489 /* Remove from the unstacked list. */
490 di_list = g_slist_remove(di_list, di_to);
493 /* Stack on top of source di. */
494 di_from->next_di = g_slist_append(di_from->next_di, di_to);
500 * Find a decoder instance by its instance ID.
502 * Only the bottom level of instances are searched -- instances already stacked
503 * on top of another one will not be found.
505 * @param inst_id The instance ID to be found.
507 * @return Pointer to struct srd_decoder_inst, or NULL if not found.
509 SRD_API struct srd_decoder_inst *srd_inst_find_by_id(const char *inst_id)
512 struct srd_decoder_inst *tmp, *di;
515 for (l = di_list; l; l = l->next) {
517 if (!strcmp(tmp->inst_id, inst_id)) {
527 * Find a decoder instance by its Python object.
529 * I.e. find that instance's instantiation of the sigrokdecode.Decoder class.
530 * This will recurse to find the instance anywhere in the stack tree.
532 * @param stack Pointer to a GSList of struct srd_decoder_inst, indicating the
533 * stack to search. To start searching at the bottom level of
534 * 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(const GSList *stack,
544 struct srd_decoder_inst *tmp, *di;
547 for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) {
549 if (tmp->py_inst == obj)
551 else if (tmp->next_di)
552 di = srd_inst_find_by_obj(tmp->next_di, obj);
558 SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di, PyObject *args)
560 PyObject *py_name, *py_res;
562 struct srd_decoder_inst *next_di;
564 srd_dbg("Calling start() method on protocol decoder instance %s.",
567 if (!(py_name = PyUnicode_FromString("start"))) {
568 srd_err("Unable to build Python object for 'start'.");
569 catch_exception("Protocol decoder instance %s: ",
571 return SRD_ERR_PYTHON;
574 if (!(py_res = PyObject_CallMethodObjArgs(di->py_inst,
575 py_name, args, NULL))) {
576 catch_exception("Protocol decoder instance %s: ",
578 return SRD_ERR_PYTHON;
585 * Start all the PDs stacked on top of this one. Pass along the
586 * metadata all the way from the bottom PD, even though it's only
587 * applicable to logic data for now.
589 for (l = di->next_di; l; l = l->next) {
591 srd_inst_start(next_di, args);
598 * Run the specified decoder function.
600 * @param start_samplenum The starting sample number for the buffer's sample
601 * set, relative to the start of capture.
602 * @param di The decoder instance to call. Must not be NULL.
603 * @param inbuf The buffer to decode. Must not be NULL.
604 * @param inbuflen Length of the buffer. Must be > 0.
606 * @return SRD_OK upon success, a (negative) error code otherwise.
608 SRD_PRIV int srd_inst_decode(uint64_t start_samplenum,
609 const struct srd_decoder_inst *di,
610 const uint8_t *inbuf, uint64_t inbuflen)
614 uint64_t end_samplenum;
616 srd_dbg("Calling decode() on instance %s with %d bytes starting "
617 "at sample %d.", di->inst_id, inbuflen, start_samplenum);
619 /* Return an error upon unusable input. */
621 srd_dbg("empty decoder instance");
625 srd_dbg("NULL buffer pointer");
629 srd_dbg("empty buffer");
634 * Create new srd_logic object. Each iteration around the PD's loop
635 * will fill one sample into this object.
637 logic = PyObject_New(srd_logic, &srd_logic_type);
639 logic->di = (struct srd_decoder_inst *)di;
640 logic->start_samplenum = start_samplenum;
642 logic->inbuf = (uint8_t *)inbuf;
643 logic->inbuflen = inbuflen;
644 logic->sample = PyList_New(2);
645 Py_INCREF(logic->sample);
647 Py_IncRef(di->py_inst);
648 end_samplenum = start_samplenum + inbuflen / di->data_unitsize;
649 if (!(py_res = PyObject_CallMethod(di->py_inst, "decode",
650 "KKO", logic->start_samplenum,
651 end_samplenum, logic))) {
652 catch_exception("Protocol decoder instance %s: ",
654 return SRD_ERR_PYTHON; /* TODO: More specific error? */
661 SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di)
664 struct srd_pd_output *pdo;
666 srd_dbg("Freeing instance %s", di->inst_id);
668 Py_DecRef(di->py_inst);
670 g_free(di->dec_probemap);
671 g_slist_free(di->next_di);
672 for (l = di->pd_output; l; l = l->next) {
674 g_free(pdo->proto_id);
677 g_slist_free(di->pd_output);
680 SRD_PRIV void srd_inst_free_all(GSList *stack)
683 struct srd_decoder_inst *di;
686 for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) {
689 srd_inst_free_all(di->next_di);
693 g_slist_free(di_list);
699 * Start a decoding session.
701 * Decoders, instances and stack must have been prepared beforehand.
703 * @param num_probes The number of probes which the incoming feed will contain.
704 * @param unitsize The number of bytes per sample in the incoming feed.
705 * @param samplerate The samplerate of the incoming feed.
707 * @return SRD_OK upon success, a (negative) error code otherwise.
709 SRD_API int srd_session_start(int num_probes, int unitsize, uint64_t samplerate)
713 struct srd_decoder_inst *di;
716 srd_dbg("Calling start() on all instances with %d probes, "
717 "unitsize %d samplerate %d.", num_probes, unitsize, samplerate);
720 * Currently only one item of metadata is passed along to decoders,
721 * samplerate. This can be extended as needed.
723 if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) {
724 srd_err("Unable to build Python object for metadata.");
725 return SRD_ERR_PYTHON;
728 /* Run the start() method on all decoders receiving frontend data. */
729 for (d = di_list; d; d = d->next) {
731 di->data_num_probes = num_probes;
732 di->data_unitsize = unitsize;
733 di->data_samplerate = samplerate;
734 if ((ret = srd_inst_start(di, args) != SRD_OK))
744 * Send a chunk of logic sample data to a running decoder session.
746 * @param start_samplenum The sample number of the first sample in this chunk.
747 * @param inbuf Pointer to sample data.
748 * @param inbuf Length in bytes of the buffer.
750 * @return SRD_OK upon success, a (negative) error code otherwise.
752 SRD_API int srd_session_send(uint64_t start_samplenum, const uint8_t *inbuf,
758 srd_dbg("Calling decode() on all instances with starting sample "
759 "number %" PRIu64 ", %" PRIu64 " bytes at 0x%p",
760 start_samplenum, inbuflen, inbuf);
762 for (d = di_list; d; d = d->next) {
763 if ((ret = srd_inst_decode(start_samplenum, d->data, inbuf,
764 inbuflen)) != SRD_OK)
772 * Register a decoder output callback function.
774 * The function will be called when a protocol decoder sends output back
775 * to the PD controller (except for Python objects, which only go up the
778 * @param output_type The output type this callback will receive. Only one
779 * callback per output type can be registered.
780 * @param cb The function to call. Must not be NULL.
781 * @param cb_data Private data for the callback function. Can be NULL.
783 SRD_API int srd_register_callback(int output_type,
784 srd_pd_output_callback_t cb, void *cb_data)
786 struct srd_pd_callback *pd_cb;
788 srd_dbg("Registering new callback for output type %d.", output_type);
790 if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) {
791 srd_err("Failed to g_malloc() struct srd_pd_callback.");
792 return SRD_ERR_MALLOC;
795 pd_cb->output_type = output_type;
797 pd_cb->cb_data = cb_data;
798 callbacks = g_slist_append(callbacks, pd_cb);
803 SRD_PRIV void *srd_find_callback(int output_type)
806 struct srd_pd_callback *pd_cb;
810 for (l = callbacks; l; l = l->next) {
812 if (pd_cb->output_type == output_type) {
821 /* This is the backend function to Python sigrokdecode.add() call. */
822 SRD_PRIV int pd_add(struct srd_decoder_inst *di, int output_type,
823 const char *proto_id)
825 struct srd_pd_output *pdo;
827 srd_dbg("Instance %s creating new output type %d for %s.",
828 di->inst_id, output_type, proto_id);
830 if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) {
831 srd_err("Failed to g_malloc() struct srd_pd_output.");
835 /* pdo_id is just a simple index, nothing is deleted from this list anyway. */
836 pdo->pdo_id = g_slist_length(di->pd_output);
837 pdo->output_type = output_type;
839 pdo->proto_id = g_strdup(proto_id);
840 di->pd_output = g_slist_append(di->pd_output, pdo);