2 * This file is part of the libsigrok project.
4 * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
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/>.
22 #include "libsigrok.h"
23 #include "libsigrok-internal.h"
25 #define LOG_PREFIX "transform"
30 * Transform module handling.
34 * @defgroup grp_transform Transform modules
36 * Transform module handling.
42 extern SR_PRIV struct sr_transform_module transform_nop;
43 extern SR_PRIV struct sr_transform_module transform_scale;
44 extern SR_PRIV struct sr_transform_module transform_invert;
47 static const struct sr_transform_module *transform_module_list[] = {
55 * Returns a NULL-terminated list of all available transform modules.
59 SR_API const struct sr_transform_module **sr_transform_list(void)
61 return transform_module_list;
65 * Returns the specified transform module's ID.
69 SR_API const char *sr_transform_id_get(const struct sr_transform_module *tmod)
72 sr_err("Invalid transform module NULL!");
80 * Returns the specified transform module's name.
84 SR_API const char *sr_transform_name_get(const struct sr_transform_module *tmod)
87 sr_err("Invalid transform module NULL!");
95 * Returns the specified transform module's description.
99 SR_API const char *sr_transform_description_get(const struct sr_transform_module *tmod)
102 sr_err("Invalid transform module NULL!");
110 * Return the transform module with the specified ID, or NULL if no module
111 * with that ID is found.
115 SR_API const struct sr_transform_module *sr_transform_find(const char *id)
119 for (i = 0; transform_module_list[i]; i++) {
120 if (!strcmp(transform_module_list[i]->id, id))
121 return transform_module_list[i];
128 * Returns a NULL-terminated array of struct sr_option, or NULL if the
129 * module takes no options.
131 * Each call to this function must be followed by a call to
132 * sr_transform_options_free().
136 SR_API const struct sr_option **sr_transform_options_get(const struct sr_transform_module *tmod)
138 const struct sr_option *mod_opts, **opts;
141 if (!tmod || !tmod->options)
144 mod_opts = tmod->options();
146 for (size = 0; mod_opts[size].id; size++)
148 opts = g_malloc((size + 1) * sizeof(struct sr_option *));
150 for (i = 0; i < size; i++)
151 opts[i] = &mod_opts[i];
158 * After a call to sr_transform_options_get(), this function cleans up all
159 * resources returned by that call.
163 SR_API void sr_transform_options_free(const struct sr_option **options)
170 for (i = 0; options[i]; i++) {
171 if (options[i]->def) {
172 g_variant_unref(options[i]->def);
173 ((struct sr_option *)options[i])->def = NULL;
176 if (options[i]->values) {
177 g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref);
178 ((struct sr_option *)options[i])->values = NULL;
185 * Create a new transform instance using the specified transform module.
187 * <code>options</code> is a *GHashTable with the keys corresponding with
188 * the module options' <code>id</code> field. The values should be GVariant
189 * pointers with sunk * references, of the same GVariantType as the option's
192 * The sr_dev_inst passed in can be used by the instance to determine
193 * channel names, samplerate, and so on.
197 SR_API const struct sr_transform *sr_transform_new(const struct sr_transform_module *tmod,
198 GHashTable *options, const struct sr_dev_inst *sdi)
200 struct sr_transform *t;
201 const struct sr_option *mod_opts;
202 const GVariantType *gvt;
203 GHashTable *new_opts;
208 t = g_malloc(sizeof(struct sr_transform));
212 new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
213 (GDestroyNotify)g_variant_unref);
215 mod_opts = tmod->options();
216 for (i = 0; mod_opts[i].id; i++) {
217 if (options && g_hash_table_lookup_extended(options,
218 mod_opts[i].id, &key, &value)) {
219 /* Pass option along. */
220 gvt = g_variant_get_type(mod_opts[i].def);
221 if (!g_variant_is_of_type(value, gvt)) {
222 sr_err("Invalid type for '%s' option.", key);
226 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
227 g_variant_ref(value));
229 /* Option not given: insert the default value. */
230 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
231 g_variant_ref(mod_opts[i].def));
235 /* Make sure no invalid options were given. */
237 g_hash_table_iter_init(&iter, options);
238 while (g_hash_table_iter_next(&iter, &key, &value)) {
239 if (!g_hash_table_lookup(new_opts, key)) {
240 sr_err("Transform module '%s' has no option '%s'.", tmod->id, key);
241 g_hash_table_destroy(new_opts);
249 if (t->module->init && t->module->init(t, new_opts) != SR_OK) {
254 g_hash_table_destroy(new_opts);
256 /* Add the transform to the session's list of transforms. */
257 sdi->session->transforms = g_slist_append(sdi->session->transforms, t);
263 * Free the specified transform instance and all associated resources.
267 SR_API int sr_transform_free(const struct sr_transform *t)
275 if (t->module->cleanup)
276 ret = t->module->cleanup((struct sr_transform *)t);