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b2c19614 BV |
1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
bc5f5a43 | 5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> |
b2c19614 BV |
6 | * |
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. | |
11 | * | |
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. | |
16 | * | |
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/>. | |
19 | */ | |
20 | ||
73191416 | 21 | #include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ |
7ce7775c BV |
22 | #include "sigrokdecode-internal.h" |
23 | #include "config.h" | |
b2c19614 | 24 | #include <glib.h> |
1aef2f93 | 25 | #include <inttypes.h> |
0bdadba2 | 26 | #include <stdlib.h> |
b2c19614 | 27 | |
b2c19614 | 28 | |
7ce7775c | 29 | static GSList *di_list = NULL; |
983cb0f5 BV |
30 | static GSList *callbacks = NULL; |
31 | ||
bc5f5a43 BV |
32 | /* lives in decoder.c */ |
33 | extern GSList *pd_list; | |
b2c19614 | 34 | |
bc5f5a43 BV |
35 | /* lives in module_sigrokdecode.c */ |
36 | extern PyMODINIT_FUNC PyInit_sigrokdecode(void); | |
b2c19614 | 37 | |
bc5f5a43 BV |
38 | /* lives in type_logic.c */ |
39 | extern PyTypeObject srd_logic_type; | |
b2c19614 | 40 | |
e5080882 | 41 | |
b2c19614 BV |
42 | /** |
43 | * Initialize libsigrokdecode. | |
44 | * | |
45 | * This initializes the Python interpreter, and creates and initializes | |
46 | * a "sigrok" Python module with a single put() method. | |
47 | * | |
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(). | |
52 | * | |
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. | |
55 | * | |
7ce7775c | 56 | * Multiple calls to srd_init(), without calling srd_exit() in between, |
b2c19614 BV |
57 | * are not allowed. |
58 | * | |
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. | |
63 | */ | |
64 | int srd_init(void) | |
65 | { | |
66 | int ret; | |
67 | ||
bc5f5a43 | 68 | PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode); |
5f802ec6 | 69 | |
b2c19614 BV |
70 | /* Py_Initialize() returns void and usually cannot fail. */ |
71 | Py_Initialize(); | |
72 | ||
b2c19614 BV |
73 | if ((ret = set_modulepath()) != SRD_OK) { |
74 | Py_Finalize(); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | if ((ret = srd_load_all_decoders()) != SRD_OK) { | |
79 | Py_Finalize(); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | return SRD_OK; | |
84 | } | |
85 | ||
86 | ||
87 | /** | |
88 | * Shutdown libsigrokdecode. | |
89 | * | |
90 | * This frees all the memory allocated for protocol decoders and shuts down | |
91 | * the Python interpreter. | |
92 | * | |
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 | |
7ce7775c | 95 | * any successful srd_init() calls in between, is not allowed. |
b2c19614 BV |
96 | * |
97 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
98 | */ | |
99 | int srd_exit(void) | |
100 | { | |
101 | /* Unload/free all decoders, and then the list of decoders itself. */ | |
102 | /* TODO: Error handling. */ | |
103 | srd_unload_all_decoders(); | |
e5080882 | 104 | g_slist_free(pd_list); |
b2c19614 BV |
105 | |
106 | /* Py_Finalize() returns void, any finalization errors are ignored. */ | |
107 | Py_Finalize(); | |
108 | ||
109 | return SRD_OK; | |
110 | } | |
111 | ||
112 | ||
113 | /** | |
114 | * Add search directories for the protocol decoders. | |
115 | * | |
116 | * TODO: add path from env var SIGROKDECODE_PATH, config etc | |
117 | */ | |
118 | int set_modulepath(void) | |
119 | { | |
120 | int ret; | |
121 | ||
bc5f5a43 | 122 | PyRun_SimpleString("import sys"); |
b2c19614 BV |
123 | ret = PyRun_SimpleString("sys.path.append(r'" DECODERS_DIR "');"); |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
128 | ||
7ce7775c | 129 | /** |
0bdadba2 BV |
130 | * Set options in a decoder instance. |
131 | * | |
132 | * @param di Decoder instance. | |
133 | * @param options A GHashTable of options to set. | |
7ce7775c | 134 | * |
0bdadba2 BV |
135 | * Handled options are removed from the hash. |
136 | * | |
137 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
138 | */ | |
139 | int srd_instance_set_options(struct srd_decoder_instance *di, | |
140 | GHashTable *options) | |
141 | { | |
142 | PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval; | |
143 | PyObject *py_optlist, *py_classval; | |
144 | Py_UNICODE *py_ustr; | |
145 | unsigned long long int val_ull; | |
146 | int num_optkeys, ret, size, i; | |
147 | char *key, *value; | |
148 | ||
149 | if (g_hash_table_size(options) == 0) | |
150 | /* No options provided. */ | |
151 | return SRD_OK; | |
152 | ||
153 | if(!PyObject_HasAttrString(di->decoder->py_dec, "options")) | |
154 | /* Decoder has no options. */ | |
155 | return SRD_OK; | |
156 | ||
157 | ret = SRD_ERR_PYTHON; | |
158 | key = NULL; | |
159 | py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL; | |
160 | py_optlist = py_classval = NULL; | |
161 | py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options"); | |
162 | if (!PyDict_Check(py_dec_options)) { | |
163 | srd_err("Protocol decoder %s options is not a dictionary.", | |
164 | di->decoder->name); | |
165 | goto err_out; | |
166 | } | |
167 | ||
168 | /* All of these are synthesized objects, so they're good. */ | |
169 | py_dec_optkeys = PyDict_Keys(py_dec_options); | |
170 | num_optkeys = PyList_Size(py_dec_optkeys); | |
171 | if (!(py_di_options = PyObject_GetAttrString(di->py_instance, "options"))) | |
172 | goto err_out; | |
173 | for (i = 0; i < num_optkeys; i++) { | |
174 | /* Get the default class value for this option. */ | |
175 | py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key); | |
176 | if (!(py_optlist = PyDict_GetItemString(py_dec_options, key))) | |
177 | goto err_out; | |
178 | if (!(py_classval = PyList_GetItem(py_optlist, 1))) | |
179 | goto err_out; | |
180 | ||
181 | if ((value = g_hash_table_lookup(options, key))) { | |
182 | /* An override for this option was provided. */ | |
183 | if (PyUnicode_Check(py_classval)) { | |
184 | if (!(py_optval = PyUnicode_FromString(value))) { | |
185 | /* Some UTF-8 encoding error. */ | |
186 | PyErr_Clear(); | |
187 | goto err_out; | |
188 | } | |
189 | } else if (PyLong_Check(py_classval)) { | |
190 | if (!(py_optval = PyLong_FromString(value, NULL, 0))) { | |
191 | /* ValueError Exception */ | |
192 | PyErr_Clear(); | |
193 | srd_err("Option %s has invalid value %s: expected integer", | |
194 | key, value); | |
195 | goto err_out; | |
196 | } | |
197 | } | |
198 | g_hash_table_remove(options, key); | |
199 | } else { | |
200 | /* Use the class default for this option. */ | |
201 | if (PyUnicode_Check(py_classval)) { | |
202 | /* Make a brand new copy of the string. */ | |
203 | py_ustr = PyUnicode_AS_UNICODE(py_classval); | |
204 | size = PyUnicode_GET_SIZE(py_classval); | |
205 | py_optval = PyUnicode_FromUnicode(py_ustr, size); | |
206 | } else if (PyLong_Check(py_classval)) { | |
207 | /* Make a brand new copy of the integer. */ | |
208 | val_ull = PyLong_AsUnsignedLongLong(py_classval); | |
209 | if (val_ull == (unsigned long long)-1) { | |
210 | /* OverFlowError exception */ | |
211 | PyErr_Clear(); | |
212 | srd_err("Invalid integer value for %s: expected integer", key); | |
213 | goto err_out; | |
214 | } | |
215 | if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull))) | |
216 | goto err_out; | |
217 | } | |
218 | } | |
219 | ||
220 | /* If we got here, py_optval holds a known good new reference | |
221 | * to the instance option to set. | |
222 | */ | |
223 | if (PyDict_SetItemString(py_di_options, key, py_optval) == -1) | |
224 | goto err_out; | |
225 | } | |
226 | ||
227 | ret = SRD_OK; | |
228 | ||
229 | err_out: | |
230 | Py_XDECREF(py_optlist); | |
231 | Py_XDECREF(py_di_options); | |
232 | Py_XDECREF(py_dec_optkeys); | |
233 | Py_XDECREF(py_dec_options); | |
234 | if (key) | |
235 | g_free(key); | |
236 | if (PyErr_Occurred()) { | |
237 | srd_dbg("stray exception!"); | |
238 | PyErr_Print(); | |
239 | PyErr_Clear(); | |
240 | } | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | /** | |
246 | * Set probes in a decoder instance. | |
247 | * | |
248 | * @param di Decoder instance. | |
249 | * @param probes A GHashTable of probes to set. Key is probe name, value is | |
250 | * the probe number. Samples passed to this instance will be arranged in this | |
251 | * order. | |
252 | * | |
253 | * Handled probes are removed from the hash. | |
254 | * | |
255 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
256 | */ | |
257 | int srd_instance_set_probes(struct srd_decoder_instance *di, | |
258 | GHashTable *probes) | |
259 | { | |
260 | int ret; | |
261 | ||
262 | if (g_hash_table_size(probes) == 0) | |
263 | /* No probes provided. */ | |
264 | return SRD_OK; | |
265 | ||
266 | if(!PyObject_HasAttrString(di->decoder->py_dec, "probes")) | |
267 | /* Decoder has no probes. */ | |
268 | return SRD_OK; | |
269 | ||
270 | ret = SRD_ERR_PYTHON; | |
271 | ||
272 | /* TODO */ | |
273 | if (g_hash_table_size(probes) > 0) { | |
274 | srd_err("Setting probes is not yet supported."); | |
275 | return SRD_ERR_PYTHON; | |
276 | } | |
277 | ||
278 | ret = SRD_OK; | |
279 | ||
280 | return ret; | |
281 | } | |
282 | ||
283 | /** | |
284 | * Create a new protocol decoder instance. | |
7ce7775c | 285 | * |
42a85ed0 | 286 | * @param id Decoder 'id' field. |
0bdadba2 BV |
287 | * @param options GHashtable of options which override the defaults set in |
288 | * the decoder class. | |
42a85ed0 | 289 | * @return Pointer to a newly allocated struct srd_decoder_instance, or |
0bdadba2 | 290 | * NULL in case of failure. |
7ce7775c | 291 | */ |
0bdadba2 BV |
292 | struct srd_decoder_instance *srd_instance_new(const char *decoder_id, |
293 | GHashTable *options) | |
b2c19614 BV |
294 | { |
295 | struct srd_decoder *dec; | |
296 | struct srd_decoder_instance *di; | |
0bdadba2 | 297 | char *instance_id; |
b2c19614 | 298 | |
0bdadba2 | 299 | srd_dbg("%s: creating new %s instance", __func__, decoder_id); |
7ce7775c | 300 | |
0bdadba2 BV |
301 | if (!(dec = srd_get_decoder_by_id(decoder_id))) { |
302 | srd_err("Protocol decoder %s not found.", decoder_id); | |
b2c19614 | 303 | return NULL; |
0bdadba2 | 304 | } |
b2c19614 | 305 | |
0bdadba2 BV |
306 | if (!(di = g_try_malloc0(sizeof(*di)))) { |
307 | srd_err("Failed to malloc instance."); | |
7ce7775c BV |
308 | return NULL; |
309 | } | |
0bdadba2 BV |
310 | |
311 | instance_id = g_hash_table_lookup(options, "id"); | |
b2c19614 | 312 | di->decoder = dec; |
0bdadba2 BV |
313 | di->instance_id = g_strdup(instance_id ? instance_id : decoder_id); |
314 | g_hash_table_remove(options, "id"); | |
b2c19614 | 315 | |
0bdadba2 BV |
316 | /* Create a new instance of this decoder class. */ |
317 | if (!(di->py_instance = PyObject_CallObject(dec->py_dec, NULL))) { | |
b2c19614 | 318 | if (PyErr_Occurred()) |
7ce7775c | 319 | PyErr_Print(); |
0bdadba2 | 320 | g_free(di); |
7ce7775c | 321 | return NULL; |
b2c19614 | 322 | } |
7ce7775c BV |
323 | |
324 | /* Instance takes input from a frontend by default. */ | |
e5080882 | 325 | di_list = g_slist_append(di_list, di); |
b2c19614 | 326 | |
0bdadba2 BV |
327 | if (srd_instance_set_options(di, options) != SRD_OK) { |
328 | di_list = g_slist_remove(di_list, di); | |
329 | g_free(di); | |
330 | return NULL; | |
331 | } | |
b2c19614 BV |
332 | |
333 | return di; | |
334 | } | |
335 | ||
7ce7775c BV |
336 | int srd_instance_stack(struct srd_decoder_instance *di_from, |
337 | struct srd_decoder_instance *di_to) | |
338 | { | |
339 | ||
340 | if (!di_from || !di_to) { | |
341 | srd_err("invalid from/to instance pair"); | |
342 | return SRD_ERR_ARG; | |
343 | } | |
344 | ||
345 | if (!g_slist_find(di_list, di_from)) { | |
346 | srd_err("unstacked instance not found"); | |
347 | return SRD_ERR_ARG; | |
348 | } | |
349 | ||
350 | /* Remove from the unstacked list. */ | |
351 | di_list = g_slist_remove(di_list, di_to); | |
352 | ||
353 | /* Stack on top of source di. */ | |
354 | di_from->next_di = g_slist_append(di_from->next_di, di_to); | |
355 | ||
356 | return SRD_OK; | |
357 | } | |
358 | ||
b2c19614 | 359 | |
451680f1 | 360 | /* TODO: this should go into the PD stack */ |
7ce7775c BV |
361 | struct srd_decoder_instance *srd_instance_find(char *instance_id) |
362 | { | |
363 | GSList *l; | |
364 | struct srd_decoder_instance *tmp, *di; | |
b2c19614 | 365 | |
7ce7775c BV |
366 | di = NULL; |
367 | for (l = di_list; l; l = l->next) { | |
368 | tmp = l->data; | |
369 | if (!strcmp(tmp->instance_id, instance_id)) { | |
370 | di = tmp; | |
371 | break; | |
372 | } | |
373 | } | |
374 | ||
375 | return di; | |
376 | } | |
377 | ||
378 | int srd_instance_start(struct srd_decoder_instance *di, PyObject *args) | |
b2c19614 | 379 | { |
7ce7775c | 380 | PyObject *py_name, *py_res; |
b2c19614 | 381 | |
7ce7775c | 382 | srd_dbg("calling start() method on protocol decoder instance %s", di->instance_id); |
b2c19614 | 383 | |
7ce7775c BV |
384 | if (!(py_name = PyUnicode_FromString("start"))) { |
385 | srd_err("unable to build python object for 'start'"); | |
386 | if (PyErr_Occurred()) | |
387 | PyErr_Print(); | |
388 | return SRD_ERR_PYTHON; | |
389 | } | |
390 | ||
391 | if (!(py_res = PyObject_CallMethodObjArgs(di->py_instance, | |
392 | py_name, args, NULL))) { | |
393 | if (PyErr_Occurred()) | |
394 | PyErr_Print(); | |
395 | return SRD_ERR_PYTHON; | |
b2c19614 BV |
396 | } |
397 | ||
7ce7775c BV |
398 | Py_XDECREF(py_res); |
399 | Py_DECREF(py_name); | |
400 | ||
b2c19614 BV |
401 | return SRD_OK; |
402 | } | |
403 | ||
b2c19614 BV |
404 | /** |
405 | * Run the specified decoder function. | |
406 | * | |
407 | * @param dec TODO | |
408 | * @param inbuf TODO | |
409 | * @param inbuflen TODO | |
b2c19614 BV |
410 | * |
411 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
412 | */ | |
86528298 | 413 | int srd_instance_decode(uint64_t start_samplenum, |
bc5f5a43 | 414 | struct srd_decoder_instance *di, uint8_t *inbuf, uint64_t inbuflen) |
b2c19614 BV |
415 | { |
416 | PyObject *py_instance, *py_res; | |
bc5f5a43 | 417 | srd_logic *logic; |
86528298 | 418 | uint64_t end_samplenum; |
b2c19614 BV |
419 | |
420 | /* Return an error upon unusable input. */ | |
bc5f5a43 | 421 | if (di == NULL) |
a62186e4 | 422 | return SRD_ERR_ARG; /* TODO: More specific error? */ |
b2c19614 | 423 | if (inbuf == NULL) |
a62186e4 | 424 | return SRD_ERR_ARG; /* TODO: More specific error? */ |
b2c19614 | 425 | if (inbuflen == 0) /* No point in working on empty buffers. */ |
a62186e4 | 426 | return SRD_ERR_ARG; /* TODO: More specific error? */ |
b2c19614 BV |
427 | |
428 | /* TODO: Error handling. */ | |
bc5f5a43 | 429 | py_instance = di->py_instance; |
b2c19614 BV |
430 | Py_XINCREF(py_instance); |
431 | ||
bc5f5a43 BV |
432 | logic = PyObject_New(srd_logic, &srd_logic_type); |
433 | Py_INCREF(logic); | |
434 | logic->di = di; | |
86528298 | 435 | logic->start_samplenum = start_samplenum; |
bc5f5a43 BV |
436 | logic->itercnt = 0; |
437 | logic->inbuf = inbuf; | |
438 | logic->inbuflen = inbuflen; | |
439 | logic->sample = PyList_New(2); | |
440 | Py_INCREF(logic->sample); | |
441 | ||
86528298 | 442 | end_samplenum = start_samplenum + inbuflen / di->unitsize; |
b2c19614 | 443 | if (!(py_res = PyObject_CallMethod(py_instance, "decode", |
86528298 | 444 | "KKO", logic->start_samplenum, end_samplenum, logic))) { |
b2c19614 BV |
445 | if (PyErr_Occurred()) |
446 | PyErr_Print(); /* Returns void. */ | |
447 | ||
448 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
449 | } | |
450 | ||
451 | Py_XDECREF(py_res); | |
bc5f5a43 | 452 | |
b2c19614 BV |
453 | return SRD_OK; |
454 | } | |
455 | ||
456 | ||
7ce7775c BV |
457 | int srd_session_start(int num_probes, int unitsize, uint64_t samplerate) |
458 | { | |
459 | PyObject *args; | |
460 | GSList *d, *s; | |
461 | struct srd_decoder_instance *di; | |
462 | int ret; | |
463 | ||
464 | if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) { | |
465 | srd_err("unable to build python object for metadata"); | |
466 | return SRD_ERR_PYTHON; | |
467 | } | |
468 | ||
469 | /* Run the start() method on all decoders receiving frontend data. */ | |
470 | for (d = di_list; d; d = d->next) { | |
471 | di = d->data; | |
472 | di->num_probes = num_probes; | |
473 | di->unitsize = unitsize; | |
474 | di->samplerate = samplerate; | |
475 | if ((ret = srd_instance_start(di, args) != SRD_OK)) | |
476 | return ret; | |
477 | ||
478 | /* Run the start() method on all decoders up the stack from this one. */ | |
479 | for (s = di->next_di; s; s = s->next) { | |
480 | /* These don't need probes, unitsize and samplerate. */ | |
481 | di = s->data; | |
482 | if ((ret = srd_instance_start(di, args) != SRD_OK)) | |
483 | return ret; | |
484 | } | |
485 | } | |
486 | ||
487 | Py_DECREF(args); | |
488 | ||
489 | return SRD_OK; | |
490 | } | |
491 | ||
b2c19614 | 492 | /* Feed logic samples to decoder session. */ |
86528298 | 493 | int srd_session_feed(uint64_t start_samplenum, uint8_t *inbuf, uint64_t inbuflen) |
b2c19614 BV |
494 | { |
495 | GSList *d; | |
496 | int ret; | |
497 | ||
e5080882 | 498 | for (d = di_list; d; d = d->next) { |
86528298 | 499 | if ((ret = srd_instance_decode(start_samplenum, d->data, inbuf, |
1aef2f93 | 500 | inbuflen)) != SRD_OK) |
b2c19614 BV |
501 | return ret; |
502 | } | |
503 | ||
504 | return SRD_OK; | |
505 | } | |
506 | ||
507 | ||
f9a3947a | 508 | int pd_add(struct srd_decoder_instance *di, int output_type, |
94d43b37 | 509 | char *proto_id) |
e5080882 | 510 | { |
e5080882 | 511 | struct srd_pd_output *pdo; |
e5080882 BV |
512 | |
513 | if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) | |
514 | return -1; | |
515 | ||
b231546d | 516 | /* pdo_id is just a simple index, nothing is deleted from this list anyway. */ |
15969949 | 517 | pdo->pdo_id = g_slist_length(di->pd_output); |
e5080882 | 518 | pdo->output_type = output_type; |
15969949 | 519 | pdo->decoder = di->decoder; |
94d43b37 | 520 | pdo->proto_id = g_strdup(proto_id); |
e5080882 BV |
521 | di->pd_output = g_slist_append(di->pd_output, pdo); |
522 | ||
15969949 | 523 | return pdo->pdo_id; |
e5080882 BV |
524 | } |
525 | ||
bc5f5a43 BV |
526 | struct srd_decoder_instance *get_di_by_decobject(void *decobject) |
527 | { | |
7ce7775c | 528 | GSList *l, *s; |
bc5f5a43 BV |
529 | struct srd_decoder_instance *di; |
530 | ||
531 | for (l = di_list; l; l = l->next) { | |
532 | di = l->data; | |
533 | if (decobject == di->py_instance) | |
534 | return di; | |
7ce7775c BV |
535 | /* Check decoders stacked on top of this one. */ |
536 | for (s = di->next_di; s; s = s->next) { | |
537 | di = s->data; | |
538 | if (decobject == di->py_instance) | |
539 | return di; | |
540 | } | |
bc5f5a43 BV |
541 | } |
542 | ||
543 | return NULL; | |
544 | } | |
545 | ||
983cb0f5 BV |
546 | int srd_register_callback(int output_type, void *cb) |
547 | { | |
548 | struct srd_pd_callback *pd_cb; | |
549 | ||
550 | if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) | |
551 | return SRD_ERR_MALLOC; | |
552 | ||
553 | pd_cb->output_type = output_type; | |
554 | pd_cb->callback = cb; | |
555 | callbacks = g_slist_append(callbacks, pd_cb); | |
556 | ||
983cb0f5 BV |
557 | return SRD_OK; |
558 | } | |
559 | ||
560 | void *srd_find_callback(int output_type) | |
561 | { | |
562 | GSList *l; | |
563 | struct srd_pd_callback *pd_cb; | |
564 | void *(cb); | |
565 | ||
566 | cb = NULL; | |
567 | for (l = callbacks; l; l = l->next) { | |
568 | pd_cb = l->data; | |
569 | if (pd_cb->output_type == output_type) { | |
570 | cb = pd_cb->callback; | |
571 | break; | |
572 | } | |
573 | } | |
574 | ||
575 | return cb; | |
576 | } | |
e5080882 | 577 |