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 static GSList *di_list = NULL;
30 static GSList *callbacks = NULL;
32 /* lives in decoder.c */
33 extern GSList *pd_list;
35 /* lives in module_sigrokdecode.c */
36 extern PyMODINIT_FUNC PyInit_sigrokdecode(void);
38 /* lives in type_logic.c */
39 extern PyTypeObject srd_logic_type;
43 * Initialize libsigrokdecode.
45 * This initializes the Python interpreter, and creates and initializes
46 * a "sigrok" Python module with a single put() method.
48 * Then, it searches for sigrok protocol decoder files (*.py) in the
49 * "decoders" subdirectory of the the sigrok installation directory.
50 * All decoders that are found are loaded into memory and added to an
51 * internal list of decoders, which can be queried via srd_list_decoders().
53 * The caller is responsible for calling the clean-up function srd_exit(),
54 * which will properly shut down libsigrokdecode and free its allocated memory.
56 * Multiple calls to srd_init(), without calling srd_exit() in between,
59 * @return SRD_OK upon success, a (negative) error code otherwise.
60 * Upon Python errors, return SRD_ERR_PYTHON. If the sigrok decoders
61 * directory cannot be accessed, return SRD_ERR_DECODERS_DIR.
62 * If not enough memory could be allocated, return SRD_ERR_MALLOC.
68 PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode);
70 /* Py_Initialize() returns void and usually cannot fail. */
73 if ((ret = set_modulepath()) != SRD_OK) {
78 if ((ret = srd_load_all_decoders()) != SRD_OK) {
88 * Shutdown libsigrokdecode.
90 * This frees all the memory allocated for protocol decoders and shuts down
91 * the Python interpreter.
93 * This function should only be called if there was a (successful!) invocation
94 * of srd_init() before. Calling this function multiple times in a row, without
95 * any successful srd_init() calls in between, is not allowed.
97 * @return SRD_OK upon success, a (negative) error code otherwise.
101 /* Unload/free all decoders, and then the list of decoders itself. */
102 /* TODO: Error handling. */
103 srd_unload_all_decoders();
104 g_slist_free(pd_list);
106 /* Py_Finalize() returns void, any finalization errors are ignored. */
114 * Add search directories for the protocol decoders.
116 * TODO: add path from env var SIGROKDECODE_PATH, config etc
118 int set_modulepath(void)
122 PyRun_SimpleString("import sys");
123 ret = PyRun_SimpleString("sys.path.append(r'" DECODERS_DIR "');");
130 * Set options in a decoder instance.
132 * @param di Decoder instance.
133 * @param options A GHashTable of options to set.
135 * Handled options are removed from the hash.
137 * @return SRD_OK upon success, a (negative) error code otherwise.
139 int srd_instance_set_options(struct srd_decoder_instance *di,
142 PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval;
143 PyObject *py_optlist, *py_classval;
145 unsigned long long int val_ull;
146 int num_optkeys, ret, size, i;
149 if(!PyObject_HasAttrString(di->decoder->py_dec, "options")) {
150 /* Decoder has no options. */
151 if (g_hash_table_size(options) == 0) {
152 /* No options provided. */
155 srd_err("Protocol decoder has no options.");
161 ret = SRD_ERR_PYTHON;
163 py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL;
164 py_optlist = py_classval = NULL;
165 py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options");
166 if (!PyDict_Check(py_dec_options)) {
167 srd_err("Protocol decoder %s options is not a dictionary.",
172 /* All of these are synthesized objects, so they're good. */
173 py_dec_optkeys = PyDict_Keys(py_dec_options);
174 num_optkeys = PyList_Size(py_dec_optkeys);
175 if (!(py_di_options = PyObject_GetAttrString(di->py_instance, "options")))
177 for (i = 0; i < num_optkeys; i++) {
178 /* Get the default class value for this option. */
179 py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key);
180 if (!(py_optlist = PyDict_GetItemString(py_dec_options, key)))
182 if (!(py_classval = PyList_GetItem(py_optlist, 1)))
185 if ((value = g_hash_table_lookup(options, key))) {
186 /* An override for this option was provided. */
187 if (PyUnicode_Check(py_classval)) {
188 if (!(py_optval = PyUnicode_FromString(value))) {
189 /* Some UTF-8 encoding error. */
193 } else if (PyLong_Check(py_classval)) {
194 if (!(py_optval = PyLong_FromString(value, NULL, 0))) {
195 /* ValueError Exception */
197 srd_err("Option %s has invalid value %s: expected integer",
202 g_hash_table_remove(options, key);
204 /* Use the class default for this option. */
205 if (PyUnicode_Check(py_classval)) {
206 /* Make a brand new copy of the string. */
207 py_ustr = PyUnicode_AS_UNICODE(py_classval);
208 size = PyUnicode_GET_SIZE(py_classval);
209 py_optval = PyUnicode_FromUnicode(py_ustr, size);
210 } else if (PyLong_Check(py_classval)) {
211 /* Make a brand new copy of the integer. */
212 val_ull = PyLong_AsUnsignedLongLong(py_classval);
213 if (val_ull == (unsigned long long)-1) {
214 /* OverFlowError exception */
216 srd_err("Invalid integer value for %s: expected integer", key);
219 if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull)))
224 /* If we got here, py_optval holds a known good new reference
225 * to the instance option to set.
227 if (PyDict_SetItemString(py_di_options, key, py_optval) == -1)
234 Py_XDECREF(py_optlist);
235 Py_XDECREF(py_di_options);
236 Py_XDECREF(py_dec_optkeys);
237 Py_XDECREF(py_dec_options);
240 if (PyErr_Occurred()) {
241 srd_dbg("stray exception!");
250 * Set probes in a decoder instance.
252 * @param di Decoder instance.
253 * @param probes A GHashTable of probes to set. Key is probe name, value is
254 * the probe number. Samples passed to this instance will be arranged in this
257 * Handled probes are removed from the hash.
259 * @return SRD_OK upon success, a (negative) error code otherwise.
261 int srd_instance_set_probes(struct srd_decoder_instance *di,
266 if (g_hash_table_size(probes) == 0)
267 /* No probes provided. */
270 if(!PyObject_HasAttrString(di->decoder->py_dec, "probes"))
271 /* Decoder has no probes. */
274 ret = SRD_ERR_PYTHON;
277 if (g_hash_table_size(probes) > 0) {
278 srd_err("Setting probes is not yet supported.");
279 return SRD_ERR_PYTHON;
288 * Create a new protocol decoder instance.
290 * @param id Decoder 'id' field.
291 * @param options GHashtable of options which override the defaults set in
293 * @return Pointer to a newly allocated struct srd_decoder_instance, or
294 * NULL in case of failure.
296 struct srd_decoder_instance *srd_instance_new(const char *decoder_id,
299 struct srd_decoder *dec;
300 struct srd_decoder_instance *di;
303 srd_dbg("%s: creating new %s instance", __func__, decoder_id);
305 if (!(dec = srd_get_decoder_by_id(decoder_id))) {
306 srd_err("Protocol decoder %s not found.", decoder_id);
310 if (!(di = g_try_malloc0(sizeof(*di)))) {
311 srd_err("Failed to malloc instance.");
315 instance_id = g_hash_table_lookup(options, "id");
317 di->instance_id = g_strdup(instance_id ? instance_id : decoder_id);
318 g_hash_table_remove(options, "id");
320 /* Create a new instance of this decoder class. */
321 if (!(di->py_instance = PyObject_CallObject(dec->py_dec, NULL))) {
322 if (PyErr_Occurred())
328 /* Instance takes input from a frontend by default. */
329 di_list = g_slist_append(di_list, di);
331 if (srd_instance_set_options(di, options) != SRD_OK) {
332 di_list = g_slist_remove(di_list, di);
340 int srd_instance_stack(struct srd_decoder_instance *di_from,
341 struct srd_decoder_instance *di_to)
344 if (!di_from || !di_to) {
345 srd_err("invalid from/to instance pair");
349 if (!g_slist_find(di_list, di_from)) {
350 srd_err("unstacked instance not found");
354 /* Remove from the unstacked list. */
355 di_list = g_slist_remove(di_list, di_to);
357 /* Stack on top of source di. */
358 di_from->next_di = g_slist_append(di_from->next_di, di_to);
364 /* TODO: this should go into the PD stack */
365 struct srd_decoder_instance *srd_instance_find(char *instance_id)
368 struct srd_decoder_instance *tmp, *di;
371 for (l = di_list; l; l = l->next) {
373 if (!strcmp(tmp->instance_id, instance_id)) {
382 int srd_instance_start(struct srd_decoder_instance *di, PyObject *args)
384 PyObject *py_name, *py_res;
386 srd_dbg("calling start() method on protocol decoder instance %s", di->instance_id);
388 if (!(py_name = PyUnicode_FromString("start"))) {
389 srd_err("unable to build python object for 'start'");
390 if (PyErr_Occurred())
392 return SRD_ERR_PYTHON;
395 if (!(py_res = PyObject_CallMethodObjArgs(di->py_instance,
396 py_name, args, NULL))) {
397 if (PyErr_Occurred())
399 return SRD_ERR_PYTHON;
409 * Run the specified decoder function.
413 * @param inbuflen TODO
415 * @return SRD_OK upon success, a (negative) error code otherwise.
417 int srd_instance_decode(uint64_t start_samplenum,
418 struct srd_decoder_instance *di, uint8_t *inbuf, uint64_t inbuflen)
420 PyObject *py_instance, *py_res;
422 uint64_t end_samplenum;
424 /* Return an error upon unusable input. */
426 return SRD_ERR_ARG; /* TODO: More specific error? */
428 return SRD_ERR_ARG; /* TODO: More specific error? */
429 if (inbuflen == 0) /* No point in working on empty buffers. */
430 return SRD_ERR_ARG; /* TODO: More specific error? */
432 /* TODO: Error handling. */
433 py_instance = di->py_instance;
434 Py_XINCREF(py_instance);
436 logic = PyObject_New(srd_logic, &srd_logic_type);
439 logic->start_samplenum = start_samplenum;
441 logic->inbuf = inbuf;
442 logic->inbuflen = inbuflen;
443 logic->sample = PyList_New(2);
444 Py_INCREF(logic->sample);
446 end_samplenum = start_samplenum + inbuflen / di->unitsize;
447 if (!(py_res = PyObject_CallMethod(py_instance, "decode",
448 "KKO", logic->start_samplenum, end_samplenum, logic))) {
449 if (PyErr_Occurred())
450 PyErr_Print(); /* Returns void. */
452 return SRD_ERR_PYTHON; /* TODO: More specific error? */
461 int srd_session_start(int num_probes, int unitsize, uint64_t samplerate)
465 struct srd_decoder_instance *di;
468 if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) {
469 srd_err("unable to build python object for metadata");
470 return SRD_ERR_PYTHON;
473 /* Run the start() method on all decoders receiving frontend data. */
474 for (d = di_list; d; d = d->next) {
476 di->num_probes = num_probes;
477 di->unitsize = unitsize;
478 di->samplerate = samplerate;
479 if ((ret = srd_instance_start(di, args) != SRD_OK))
482 /* Run the start() method on all decoders up the stack from this one. */
483 for (s = di->next_di; s; s = s->next) {
484 /* These don't need probes, unitsize and samplerate. */
486 if ((ret = srd_instance_start(di, args) != SRD_OK))
496 /* Feed logic samples to decoder session. */
497 int srd_session_feed(uint64_t start_samplenum, uint8_t *inbuf, uint64_t inbuflen)
502 for (d = di_list; d; d = d->next) {
503 if ((ret = srd_instance_decode(start_samplenum, d->data, inbuf,
504 inbuflen)) != SRD_OK)
512 int pd_add(struct srd_decoder_instance *di, int output_type,
515 struct srd_pd_output *pdo;
517 if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output))))
520 /* pdo_id is just a simple index, nothing is deleted from this list anyway. */
521 pdo->pdo_id = g_slist_length(di->pd_output);
522 pdo->output_type = output_type;
523 pdo->decoder = di->decoder;
524 pdo->proto_id = g_strdup(proto_id);
525 di->pd_output = g_slist_append(di->pd_output, pdo);
530 struct srd_decoder_instance *get_di_by_decobject(void *decobject)
533 struct srd_decoder_instance *di;
535 for (l = di_list; l; l = l->next) {
537 if (decobject == di->py_instance)
539 /* Check decoders stacked on top of this one. */
540 for (s = di->next_di; s; s = s->next) {
542 if (decobject == di->py_instance)
550 int srd_register_callback(int output_type, void *cb)
552 struct srd_pd_callback *pd_cb;
554 if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback))))
555 return SRD_ERR_MALLOC;
557 pd_cb->output_type = output_type;
558 pd_cb->callback = cb;
559 callbacks = g_slist_append(callbacks, pd_cb);
564 void *srd_find_callback(int output_type)
567 struct srd_pd_callback *pd_cb;
571 for (l = callbacks; l; l = l->next) {
573 if (pd_cb->output_type == output_type) {
574 cb = pd_cb->callback;