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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <string.h> | |
21 | #include <libsigrok/libsigrok.h> | |
22 | #include "libsigrok-internal.h" | |
23 | ||
24 | /** @cond PRIVATE */ | |
25 | #define LOG_PREFIX "output" | |
26 | /** @endcond */ | |
27 | ||
28 | /** | |
29 | * @file | |
30 | * | |
31 | * Output module handling. | |
32 | */ | |
33 | ||
34 | /** | |
35 | * @defgroup grp_output Output modules | |
36 | * | |
37 | * Output module handling. | |
38 | * | |
39 | * libsigrok supports several output modules for file formats such as binary, | |
40 | * VCD, gnuplot, and so on. It provides an output API that frontends can use. | |
41 | * New output modules can be added/implemented in libsigrok without having | |
42 | * to change the frontends at all. | |
43 | * | |
44 | * All output modules are fed data in a stream. Devices that can stream data | |
45 | * into libsigrok, instead of storing and then transferring the whole buffer, | |
46 | * can thus generate output live. | |
47 | * | |
48 | * Output modules generate a newly allocated GString. The caller is then | |
49 | * expected to free this with g_string_free() when finished with it. | |
50 | * | |
51 | * @{ | |
52 | */ | |
53 | ||
54 | /** @cond PRIVATE */ | |
55 | extern SR_PRIV struct sr_output_module output_bits; | |
56 | extern SR_PRIV struct sr_output_module output_hex; | |
57 | extern SR_PRIV struct sr_output_module output_ascii; | |
58 | extern SR_PRIV struct sr_output_module output_binary; | |
59 | extern SR_PRIV struct sr_output_module output_vcd; | |
60 | extern SR_PRIV struct sr_output_module output_ols; | |
61 | extern SR_PRIV struct sr_output_module output_gnuplot; | |
62 | extern SR_PRIV struct sr_output_module output_chronovu_la8; | |
63 | extern SR_PRIV struct sr_output_module output_csv; | |
64 | extern SR_PRIV struct sr_output_module output_analog; | |
65 | extern SR_PRIV struct sr_output_module output_srzip; | |
66 | extern SR_PRIV struct sr_output_module output_wav; | |
67 | /* @endcond */ | |
68 | ||
69 | static const struct sr_output_module *output_module_list[] = { | |
70 | &output_ascii, | |
71 | &output_binary, | |
72 | &output_bits, | |
73 | &output_csv, | |
74 | &output_gnuplot, | |
75 | &output_hex, | |
76 | &output_ols, | |
77 | &output_vcd, | |
78 | &output_chronovu_la8, | |
79 | &output_analog, | |
80 | &output_srzip, | |
81 | &output_wav, | |
82 | NULL, | |
83 | }; | |
84 | ||
85 | /** | |
86 | * Returns a NULL-terminated list of all available output modules. | |
87 | * | |
88 | * @since 0.4.0 | |
89 | */ | |
90 | SR_API const struct sr_output_module **sr_output_list(void) | |
91 | { | |
92 | return output_module_list; | |
93 | } | |
94 | ||
95 | /** | |
96 | * Returns the specified output module's ID. | |
97 | * | |
98 | * @since 0.4.0 | |
99 | */ | |
100 | SR_API const char *sr_output_id_get(const struct sr_output_module *omod) | |
101 | { | |
102 | if (!omod) { | |
103 | sr_err("Invalid output module NULL!"); | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | return omod->id; | |
108 | } | |
109 | ||
110 | /** | |
111 | * Returns the specified output module's name. | |
112 | * | |
113 | * @since 0.4.0 | |
114 | */ | |
115 | SR_API const char *sr_output_name_get(const struct sr_output_module *omod) | |
116 | { | |
117 | if (!omod) { | |
118 | sr_err("Invalid output module NULL!"); | |
119 | return NULL; | |
120 | } | |
121 | ||
122 | return omod->name; | |
123 | } | |
124 | ||
125 | /** | |
126 | * Returns the specified output module's description. | |
127 | * | |
128 | * @since 0.4.0 | |
129 | */ | |
130 | SR_API const char *sr_output_description_get(const struct sr_output_module *omod) | |
131 | { | |
132 | if (!omod) { | |
133 | sr_err("Invalid output module NULL!"); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | return omod->desc; | |
138 | } | |
139 | ||
140 | /** | |
141 | * Returns the specified output module's file extensions typical for the file | |
142 | * format, as a NULL terminated array, or returns a NULL pointer if there is | |
143 | * no preferred extension. | |
144 | * @note these are a suggestions only. | |
145 | * | |
146 | * @since 0.4.0 | |
147 | */ | |
148 | SR_API const char *const *sr_output_extensions_get( | |
149 | const struct sr_output_module *omod) | |
150 | { | |
151 | if (!omod) { | |
152 | sr_err("Invalid output module NULL!"); | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | return omod->exts; | |
157 | } | |
158 | ||
159 | /* | |
160 | * Checks whether a given flag is set. | |
161 | * | |
162 | * @see sr_output_flag | |
163 | * @since 0.4.0 | |
164 | */ | |
165 | SR_API gboolean sr_output_test_flag(const struct sr_output_module *omod, | |
166 | uint64_t flag) | |
167 | { | |
168 | return (flag & omod->flags); | |
169 | } | |
170 | ||
171 | /** | |
172 | * Return the output module with the specified ID, or NULL if no module | |
173 | * with that id is found. | |
174 | * | |
175 | * @since 0.4.0 | |
176 | */ | |
177 | SR_API const struct sr_output_module *sr_output_find(char *id) | |
178 | { | |
179 | int i; | |
180 | ||
181 | for (i = 0; output_module_list[i]; i++) { | |
182 | if (!strcmp(output_module_list[i]->id, id)) | |
183 | return output_module_list[i]; | |
184 | } | |
185 | ||
186 | return NULL; | |
187 | } | |
188 | ||
189 | /** | |
190 | * Returns a NULL-terminated array of struct sr_option, or NULL if the | |
191 | * module takes no options. | |
192 | * | |
193 | * Each call to this function must be followed by a call to | |
194 | * sr_output_options_free(). | |
195 | * | |
196 | * @since 0.4.0 | |
197 | */ | |
198 | SR_API const struct sr_option **sr_output_options_get(const struct sr_output_module *omod) | |
199 | { | |
200 | const struct sr_option *mod_opts, **opts; | |
201 | int size, i; | |
202 | ||
203 | if (!omod || !omod->options) | |
204 | return NULL; | |
205 | ||
206 | mod_opts = omod->options(); | |
207 | ||
208 | for (size = 0; mod_opts[size].id; size++) | |
209 | ; | |
210 | opts = g_malloc((size + 1) * sizeof(struct sr_option *)); | |
211 | ||
212 | for (i = 0; i < size; i++) | |
213 | opts[i] = &mod_opts[i]; | |
214 | opts[i] = NULL; | |
215 | ||
216 | return opts; | |
217 | } | |
218 | ||
219 | /** | |
220 | * After a call to sr_output_options_get(), this function cleans up all | |
221 | * resources returned by that call. | |
222 | * | |
223 | * @since 0.4.0 | |
224 | */ | |
225 | SR_API void sr_output_options_free(const struct sr_option **options) | |
226 | { | |
227 | int i; | |
228 | ||
229 | if (!options) | |
230 | return; | |
231 | ||
232 | for (i = 0; options[i]; i++) { | |
233 | if (options[i]->def) { | |
234 | g_variant_unref(options[i]->def); | |
235 | ((struct sr_option *)options[i])->def = NULL; | |
236 | } | |
237 | ||
238 | if (options[i]->values) { | |
239 | g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref); | |
240 | ((struct sr_option *)options[i])->values = NULL; | |
241 | } | |
242 | } | |
243 | g_free(options); | |
244 | } | |
245 | ||
246 | /** | |
247 | * Create a new output instance using the specified output module. | |
248 | * | |
249 | * <code>options</code> is a *HashTable with the keys corresponding with | |
250 | * the module options' <code>id</code> field. The values should be GVariant | |
251 | * pointers with sunk * references, of the same GVariantType as the option's | |
252 | * default value. | |
253 | * | |
254 | * The sr_dev_inst passed in can be used by the instance to determine | |
255 | * channel names, samplerate, and so on. | |
256 | * | |
257 | * @since 0.4.0 | |
258 | */ | |
259 | SR_API const struct sr_output *sr_output_new(const struct sr_output_module *omod, | |
260 | GHashTable *options, const struct sr_dev_inst *sdi, | |
261 | const char *filename) | |
262 | { | |
263 | struct sr_output *op; | |
264 | const struct sr_option *mod_opts; | |
265 | const GVariantType *gvt; | |
266 | GHashTable *new_opts; | |
267 | GHashTableIter iter; | |
268 | gpointer key, value; | |
269 | int i; | |
270 | ||
271 | op = g_malloc(sizeof(struct sr_output)); | |
272 | op->module = omod; | |
273 | op->sdi = sdi; | |
274 | op->filename = g_strdup(filename); | |
275 | ||
276 | new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, | |
277 | (GDestroyNotify)g_variant_unref); | |
278 | if (omod->options) { | |
279 | mod_opts = omod->options(); | |
280 | for (i = 0; mod_opts[i].id; i++) { | |
281 | if (options && g_hash_table_lookup_extended(options, | |
282 | mod_opts[i].id, &key, &value)) { | |
283 | /* Pass option along. */ | |
284 | gvt = g_variant_get_type(mod_opts[i].def); | |
285 | if (!g_variant_is_of_type(value, gvt)) { | |
286 | sr_err("Invalid type for '%s' option.", key); | |
287 | g_free(op); | |
288 | return NULL; | |
289 | } | |
290 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
291 | g_variant_ref(value)); | |
292 | } else { | |
293 | /* Option not given: insert the default value. */ | |
294 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
295 | g_variant_ref(mod_opts[i].def)); | |
296 | } | |
297 | } | |
298 | ||
299 | /* Make sure no invalid options were given. */ | |
300 | if (options) { | |
301 | g_hash_table_iter_init(&iter, options); | |
302 | while (g_hash_table_iter_next(&iter, &key, &value)) { | |
303 | if (!g_hash_table_lookup(new_opts, key)) { | |
304 | sr_err("Output module '%s' has no option '%s'", omod->id, key); | |
305 | g_hash_table_destroy(new_opts); | |
306 | g_free(op); | |
307 | return NULL; | |
308 | } | |
309 | } | |
310 | } | |
311 | } | |
312 | ||
313 | if (op->module->init && op->module->init(op, new_opts) != SR_OK) { | |
314 | g_free(op); | |
315 | op = NULL; | |
316 | } | |
317 | if (new_opts) | |
318 | g_hash_table_destroy(new_opts); | |
319 | ||
320 | return op; | |
321 | } | |
322 | ||
323 | /** | |
324 | * Send a packet to the specified output instance. | |
325 | * | |
326 | * The instance's output is returned as a newly allocated GString, | |
327 | * which must be freed by the caller. | |
328 | * | |
329 | * @since 0.4.0 | |
330 | */ | |
331 | SR_API int sr_output_send(const struct sr_output *o, | |
332 | const struct sr_datafeed_packet *packet, GString **out) | |
333 | { | |
334 | return o->module->receive(o, packet, out); | |
335 | } | |
336 | ||
337 | /** | |
338 | * Free the specified output instance and all associated resources. | |
339 | * | |
340 | * @since 0.4.0 | |
341 | */ | |
342 | SR_API int sr_output_free(const struct sr_output *o) | |
343 | { | |
344 | int ret; | |
345 | ||
346 | if (!o) | |
347 | return SR_ERR_ARG; | |
348 | ||
349 | ret = SR_OK; | |
350 | if (o->module->cleanup) | |
351 | ret = o->module->cleanup((struct sr_output *)o); | |
352 | g_free((char *)o->filename); | |
353 | g_free((gpointer)o); | |
354 | ||
355 | return ret; | |
356 | } | |
357 | ||
358 | /** @} */ |