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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.h" | |
22 | #include "libsigrok-internal.h" | |
23 | ||
24 | #define LOG_PREFIX "output" | |
25 | ||
26 | /** | |
27 | * @file | |
28 | * | |
29 | * Output module handling. | |
30 | */ | |
31 | ||
32 | /** | |
33 | * @defgroup grp_output Output modules | |
34 | * | |
35 | * Output module handling. | |
36 | * | |
37 | * libsigrok supports several output modules for file formats such as binary, | |
38 | * VCD, gnuplot, and so on. It provides an output API that frontends can use. | |
39 | * New output modules can be added/implemented in libsigrok without having | |
40 | * to change the frontends at all. | |
41 | * | |
42 | * All output modules are fed data in a stream. Devices that can stream data | |
43 | * into libsigrok, instead of storing and then transferring the whole buffer, | |
44 | * can thus generate output live. | |
45 | * | |
46 | * Output modules generate a newly allocated GString. The caller is then | |
47 | * expected to free this with g_string_free() when finished with it. | |
48 | * | |
49 | * @{ | |
50 | */ | |
51 | ||
52 | /** @cond PRIVATE */ | |
53 | extern SR_PRIV struct sr_output_module output_bits; | |
54 | extern SR_PRIV struct sr_output_module output_hex; | |
55 | extern SR_PRIV struct sr_output_module output_ascii; | |
56 | extern SR_PRIV struct sr_output_module output_binary; | |
57 | extern SR_PRIV struct sr_output_module output_vcd; | |
58 | extern SR_PRIV struct sr_output_module output_ols; | |
59 | extern SR_PRIV struct sr_output_module output_gnuplot; | |
60 | extern SR_PRIV struct sr_output_module output_chronovu_la8; | |
61 | extern SR_PRIV struct sr_output_module output_csv; | |
62 | extern SR_PRIV struct sr_output_module output_analog; | |
63 | extern SR_PRIV struct sr_output_module output_srzip; | |
64 | extern SR_PRIV struct sr_output_module output_wav; | |
65 | /* @endcond */ | |
66 | ||
67 | static const struct sr_output_module *output_module_list[] = { | |
68 | &output_ascii, | |
69 | &output_binary, | |
70 | &output_bits, | |
71 | &output_csv, | |
72 | &output_gnuplot, | |
73 | &output_hex, | |
74 | &output_ols, | |
75 | &output_vcd, | |
76 | &output_chronovu_la8, | |
77 | &output_analog, | |
78 | &output_srzip, | |
79 | &output_wav, | |
80 | NULL, | |
81 | }; | |
82 | ||
83 | /** | |
84 | * Returns a NULL-terminated list of all available output modules. | |
85 | * | |
86 | * @since 0.4.0 | |
87 | */ | |
88 | SR_API const struct sr_output_module **sr_output_list(void) | |
89 | { | |
90 | return output_module_list; | |
91 | } | |
92 | ||
93 | /** | |
94 | * Returns the specified output module's ID. | |
95 | * | |
96 | * @since 0.4.0 | |
97 | */ | |
98 | SR_API const char *sr_output_id_get(const struct sr_output_module *o) | |
99 | { | |
100 | if (!o) { | |
101 | sr_err("Invalid output module NULL!"); | |
102 | return NULL; | |
103 | } | |
104 | ||
105 | return o->id; | |
106 | } | |
107 | ||
108 | /** | |
109 | * Returns the specified output module's name. | |
110 | * | |
111 | * @since 0.4.0 | |
112 | */ | |
113 | SR_API const char *sr_output_name_get(const struct sr_output_module *o) | |
114 | { | |
115 | if (!o) { | |
116 | sr_err("Invalid output module NULL!"); | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | return o->name; | |
121 | } | |
122 | ||
123 | /** | |
124 | * Returns the specified output module's description. | |
125 | * | |
126 | * @since 0.4.0 | |
127 | */ | |
128 | SR_API const char *sr_output_description_get(const struct sr_output_module *o) | |
129 | { | |
130 | if (!o) { | |
131 | sr_err("Invalid output module NULL!"); | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | return o->desc; | |
136 | } | |
137 | ||
138 | /** | |
139 | * Return the output module with the specified ID, or NULL if no module | |
140 | * with that id is found. | |
141 | * | |
142 | * @since 0.4.0 | |
143 | */ | |
144 | SR_API const struct sr_output_module *sr_output_find(char *id) | |
145 | { | |
146 | int i; | |
147 | ||
148 | for (i = 0; output_module_list[i]; i++) { | |
149 | if (!strcmp(output_module_list[i]->id, id)) | |
150 | return output_module_list[i]; | |
151 | } | |
152 | ||
153 | return NULL; | |
154 | } | |
155 | ||
156 | /** | |
157 | * Returns a NULL-terminated array of struct sr_option, or NULL if the | |
158 | * module takes no options. | |
159 | * | |
160 | * Each call to this function must be followed by a call to | |
161 | * sr_output_options_free(). | |
162 | * | |
163 | * @since 0.4.0 | |
164 | */ | |
165 | SR_API const struct sr_option **sr_output_options_get(const struct sr_output_module *o) | |
166 | { | |
167 | const struct sr_option *mod_opts, **opts; | |
168 | int size, i; | |
169 | ||
170 | if (!o || !o->options) | |
171 | return NULL; | |
172 | ||
173 | mod_opts = o->options(); | |
174 | ||
175 | for (size = 0; mod_opts[size].id; size++) | |
176 | ; | |
177 | opts = g_malloc((size + 1) * sizeof(struct sr_option *)); | |
178 | ||
179 | for (i = 0; i < size; i++) | |
180 | opts[i] = &mod_opts[i]; | |
181 | opts[i] = NULL; | |
182 | ||
183 | return opts; | |
184 | } | |
185 | ||
186 | /** | |
187 | * After a call to sr_output_options_get(), this function cleans up all | |
188 | * resources returned by that call. | |
189 | * | |
190 | * @since 0.4.0 | |
191 | */ | |
192 | SR_API void sr_output_options_free(const struct sr_option **options) | |
193 | { | |
194 | int i; | |
195 | ||
196 | if (!options) | |
197 | return; | |
198 | ||
199 | for (i = 0; options[i]; i++) { | |
200 | if (options[i]->def) { | |
201 | g_variant_unref(options[i]->def); | |
202 | ((struct sr_option *)options[i])->def = NULL; | |
203 | } | |
204 | ||
205 | if (options[i]->values) { | |
206 | g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref); | |
207 | ((struct sr_option *)options[i])->values = NULL; | |
208 | } | |
209 | } | |
210 | g_free(options); | |
211 | } | |
212 | ||
213 | /** | |
214 | * Create a new output instance using the specified output module. | |
215 | * | |
216 | * <code>options</code> is a *HashTable with the keys corresponding with | |
217 | * the module options' <code>id</code> field. The values should be GVariant | |
218 | * pointers with sunk * references, of the same GVariantType as the option's | |
219 | * default value. | |
220 | * | |
221 | * The sr_dev_inst passed in can be used by the instance to determine | |
222 | * channel names, samplerate, and so on. | |
223 | * | |
224 | * @since 0.4.0 | |
225 | */ | |
226 | SR_API const struct sr_output *sr_output_new(const struct sr_output_module *o, | |
227 | GHashTable *options, const struct sr_dev_inst *sdi) | |
228 | { | |
229 | struct sr_output *op; | |
230 | const struct sr_option *mod_opts; | |
231 | const GVariantType *gvt; | |
232 | GHashTable *new_opts; | |
233 | GHashTableIter iter; | |
234 | gpointer key, value; | |
235 | int i; | |
236 | ||
237 | op = g_malloc(sizeof(struct sr_output)); | |
238 | op->module = o; | |
239 | op->sdi = sdi; | |
240 | ||
241 | new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, | |
242 | (GDestroyNotify)g_variant_unref); | |
243 | if (o->options) { | |
244 | mod_opts = o->options(); | |
245 | for (i = 0; mod_opts[i].id; i++) { | |
246 | if (options && g_hash_table_lookup_extended(options, | |
247 | mod_opts[i].id, &key, &value)) { | |
248 | /* Pass option along. */ | |
249 | gvt = g_variant_get_type(mod_opts[i].def); | |
250 | if (!g_variant_is_of_type(value, gvt)) { | |
251 | sr_err("Invalid type for '%s' option.", key); | |
252 | g_free(op); | |
253 | return NULL; | |
254 | } | |
255 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
256 | g_variant_ref(value)); | |
257 | } else { | |
258 | /* Option not given: insert the default value. */ | |
259 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
260 | g_variant_ref(mod_opts[i].def)); | |
261 | } | |
262 | } | |
263 | ||
264 | /* Make sure no invalid options were given. */ | |
265 | if (options) { | |
266 | g_hash_table_iter_init(&iter, options); | |
267 | while (g_hash_table_iter_next(&iter, &key, &value)) { | |
268 | if (!g_hash_table_lookup(new_opts, key)) { | |
269 | sr_err("Output module '%s' has no option '%s'", o->id, key); | |
270 | g_hash_table_destroy(new_opts); | |
271 | g_free(op); | |
272 | return NULL; | |
273 | } | |
274 | } | |
275 | } | |
276 | } | |
277 | ||
278 | if (op->module->init && op->module->init(op, new_opts) != SR_OK) { | |
279 | g_free(op); | |
280 | op = NULL; | |
281 | } | |
282 | if (new_opts) | |
283 | g_hash_table_destroy(new_opts); | |
284 | ||
285 | return op; | |
286 | } | |
287 | ||
288 | /** | |
289 | * Send a packet to the specified output instance. | |
290 | * | |
291 | * The instance's output is returned as a newly allocated GString, | |
292 | * which must be freed by the caller. | |
293 | * | |
294 | * @since 0.4.0 | |
295 | */ | |
296 | SR_API int sr_output_send(const struct sr_output *o, | |
297 | const struct sr_datafeed_packet *packet, GString **out) | |
298 | { | |
299 | return o->module->receive(o, packet, out); | |
300 | } | |
301 | ||
302 | /** | |
303 | * Free the specified output instance and all associated resources. | |
304 | * | |
305 | * @since 0.4.0 | |
306 | */ | |
307 | SR_API int sr_output_free(const struct sr_output *o) | |
308 | { | |
309 | int ret; | |
310 | ||
311 | if (!o) | |
312 | return SR_ERR_ARG; | |
313 | ||
314 | ret = SR_OK; | |
315 | if (o->module->cleanup) | |
316 | ret = o->module->cleanup((struct sr_output *)o); | |
317 | g_free((gpointer)o); | |
318 | ||
319 | return ret; | |
320 | } | |
321 | ||
322 | /** @} */ |