2 * This file is part of the libsigrok project.
4 * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
24 #include <glib/gstdio.h>
25 #include <libsigrok/libsigrok.h>
26 #include "libsigrok-internal.h"
29 #define LOG_PREFIX "input"
35 * Input module handling.
39 * @defgroup grp_input Input modules
41 * Input file/data module handling.
43 * libsigrok can process acquisition data in several different ways.
44 * Aside from acquiring data from a hardware device, it can also take it
45 * from a file in various formats (binary, CSV, VCD, and so on).
47 * Like all libsigrok data handling, processing is done in a streaming
48 * manner: input should be supplied a chunk at a time. This way anything
49 * that processes data can do so in real time, without the user having
50 * to wait for the whole thing to be finished.
52 * Every input module is "pluggable", meaning it's handled as being separate
53 * from the main libsigrok, but linked in to it statically. To keep things
54 * modular and separate like this, functions within an input module should be
55 * declared static, with only the respective 'struct sr_input_module' being
56 * exported for use into the wider libsigrok namespace.
62 extern SR_PRIV struct sr_input_module input_chronovu_la8;
63 extern SR_PRIV struct sr_input_module input_csv;
64 extern SR_PRIV struct sr_input_module input_binary;
65 extern SR_PRIV struct sr_input_module input_trace32_ad;
66 extern SR_PRIV struct sr_input_module input_vcd;
67 extern SR_PRIV struct sr_input_module input_wav;
68 extern SR_PRIV struct sr_input_module input_raw_analog;
69 extern SR_PRIV struct sr_input_module input_logicport;
70 extern SR_PRIV struct sr_input_module input_null;
73 static const struct sr_input_module *input_module_list[] = {
87 * Returns a NULL-terminated list of all available input modules.
91 SR_API const struct sr_input_module **sr_input_list(void)
93 return input_module_list;
97 * Returns the specified input module's ID.
101 SR_API const char *sr_input_id_get(const struct sr_input_module *imod)
104 sr_err("Invalid input module NULL!");
112 * Returns the specified input module's name.
116 SR_API const char *sr_input_name_get(const struct sr_input_module *imod)
119 sr_err("Invalid input module NULL!");
127 * Returns the specified input module's description.
131 SR_API const char *sr_input_description_get(const struct sr_input_module *imod)
134 sr_err("Invalid input module NULL!");
142 * Returns the specified input module's file extensions typical for the file
143 * format, as a NULL terminated array, or returns a NULL pointer if there is
144 * no preferred extension.
145 * @note these are a suggestions only.
149 SR_API const char *const *sr_input_extensions_get(
150 const struct sr_input_module *imod)
153 sr_err("Invalid input module NULL!");
161 * Return the input module with the specified ID, or NULL if no module
162 * with that id is found.
166 SR_API const struct sr_input_module *sr_input_find(char *id)
170 for (i = 0; input_module_list[i]; i++) {
171 if (!strcmp(input_module_list[i]->id, id))
172 return input_module_list[i];
179 * Returns a NULL-terminated array of struct sr_option, or NULL if the
180 * module takes no options.
182 * Each call to this function must be followed by a call to
183 * sr_input_options_free().
187 SR_API const struct sr_option **sr_input_options_get(const struct sr_input_module *imod)
189 const struct sr_option *mod_opts, **opts;
192 if (!imod || !imod->options)
195 mod_opts = imod->options();
197 for (size = 0; mod_opts[size].id; size++)
199 opts = g_malloc((size + 1) * sizeof(struct sr_option *));
201 for (i = 0; i < size; i++)
202 opts[i] = &mod_opts[i];
209 * After a call to sr_input_options_get(), this function cleans up all
210 * resources returned by that call.
214 SR_API void sr_input_options_free(const struct sr_option **options)
221 for (i = 0; options[i]; i++) {
222 if (options[i]->def) {
223 g_variant_unref(options[i]->def);
224 ((struct sr_option *)options[i])->def = NULL;
227 if (options[i]->values) {
228 g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref);
229 ((struct sr_option *)options[i])->values = NULL;
236 * Create a new input instance using the specified input module.
238 * This function is used when a client wants to use a specific input
239 * module to parse a stream. No effort is made to identify the format.
241 * @param imod The input module to use. Must not be NULL.
242 * @param options GHashTable consisting of keys corresponding with
243 * the module options @c id field. The values should be GVariant
244 * pointers with sunk references, of the same GVariantType as the option's
249 SR_API struct sr_input *sr_input_new(const struct sr_input_module *imod,
253 const struct sr_option *mod_opts;
254 const GVariantType *gvt;
255 GHashTable *new_opts;
260 in = g_malloc0(sizeof(struct sr_input));
263 new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
264 (GDestroyNotify)g_variant_unref);
266 mod_opts = imod->options();
267 for (i = 0; mod_opts[i].id; i++) {
268 if (options && g_hash_table_lookup_extended(options,
269 mod_opts[i].id, &key, &value)) {
270 /* Option not given: insert the default value. */
271 gvt = g_variant_get_type(mod_opts[i].def);
272 if (!g_variant_is_of_type(value, gvt)) {
273 sr_err("Invalid type for '%s' option.",
278 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
279 g_variant_ref(value));
281 /* Pass option along. */
282 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
283 g_variant_ref(mod_opts[i].def));
287 /* Make sure no invalid options were given. */
289 g_hash_table_iter_init(&iter, options);
290 while (g_hash_table_iter_next(&iter, &key, &value)) {
291 if (!g_hash_table_lookup(new_opts, key)) {
292 sr_err("Input module '%s' has no option '%s'",
293 imod->id, (char *)key);
294 g_hash_table_destroy(new_opts);
302 if (in->module->init && in->module->init(in, new_opts) != SR_OK) {
306 in->buf = g_string_sized_new(128);
310 g_hash_table_destroy(new_opts);
315 /* Returns TRUE if all required meta items are available. */
316 static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail)
321 for (m = 0; metadata[m]; m++) {
322 if (!(metadata[m] & SR_INPUT_META_REQUIRED))
324 reqd = metadata[m] & ~SR_INPUT_META_REQUIRED;
325 for (a = 0; avail[a]; a++) {
326 if (avail[a] == reqd)
330 /* Found a required meta item that isn't available. */
338 * Try to find an input module that can parse the given buffer.
340 * The buffer must contain enough of the beginning of the file for
341 * the input modules to find a match. This is format-dependent, but
342 * 128 bytes is normally enough.
344 * If an input module is found, an instance is created into *in.
345 * Otherwise, *in contains NULL. When multiple input moduless claim
346 * support for the format, the one with highest confidence takes
347 * precedence. Applications will see at most one input module spec.
349 * If an instance is created, it has the given buffer used for scanning
350 * already submitted to it, to be processed before more data is sent.
351 * This allows a frontend to submit an initial chunk of a non-seekable
352 * stream, such as stdin, without having to keep it around and submit
356 SR_API int sr_input_scan_buffer(GString *buf, const struct sr_input **in)
358 const struct sr_input_module *imod, *best_imod;
361 unsigned int conf, best_conf;
363 uint8_t mitem, avail_metadata[8];
365 /* No more metadata to be had from a buffer. */
366 avail_metadata[0] = SR_INPUT_META_HEADER;
367 avail_metadata[1] = 0;
372 for (i = 0; input_module_list[i]; i++) {
373 imod = input_module_list[i];
374 if (!imod->metadata[0]) {
375 /* Module has no metadata for matching so will take
376 * any input. No point in letting it try to match. */
379 if (!check_required_metadata(imod->metadata, avail_metadata))
380 /* Cannot satisfy this module's requirements. */
383 meta = g_hash_table_new(NULL, NULL);
384 for (m = 0; m < sizeof(imod->metadata); m++) {
385 mitem = imod->metadata[m] & ~SR_INPUT_META_REQUIRED;
386 if (mitem == SR_INPUT_META_HEADER)
387 g_hash_table_insert(meta, GINT_TO_POINTER(mitem), buf);
389 if (g_hash_table_size(meta) == 0) {
390 /* No metadata for this module, so nothing to match. */
391 g_hash_table_destroy(meta);
394 sr_spew("Trying module %s.", imod->id);
395 ret = imod->format_match(meta, &conf);
396 g_hash_table_destroy(meta);
397 if (ret == SR_ERR_DATA) {
398 /* Module recognized this buffer, but cannot handle it. */
400 } else if (ret == SR_ERR) {
401 /* Module didn't recognize this buffer. */
403 } else if (ret != SR_OK) {
404 /* Can be SR_ERR_NA. */
408 /* Found a matching module. */
409 sr_spew("Module %s matched, confidence %u.", imod->id, conf);
410 if (conf >= best_conf)
417 *in = sr_input_new(best_imod, NULL);
418 g_string_insert_len((*in)->buf, 0, buf->str, buf->len);
426 * Try to find an input module that can parse the given file.
428 * If an input module is found, an instance is created into *in.
429 * Otherwise, *in contains NULL. When multiple input moduless claim
430 * support for the format, the one with highest confidence takes
431 * precedence. Applications will see at most one input module spec.
434 SR_API int sr_input_scan_file(const char *filename, const struct sr_input **in)
438 const struct sr_input_module *imod, *best_imod;
442 unsigned int midx, i;
443 unsigned int conf, best_conf;
445 uint8_t avail_metadata[8];
449 if (!filename || !filename[0]) {
450 sr_err("Invalid filename.");
453 stream = g_fopen(filename, "rb");
455 sr_err("Failed to open %s: %s", filename, g_strerror(errno));
458 filesize = sr_file_get_size(stream);
460 sr_err("Failed to get size of %s: %s",
461 filename, g_strerror(errno));
465 /* This actually allocates 256 bytes to allow for NUL termination. */
466 header = g_string_sized_new(255);
467 count = fread(header->str, 1, header->allocated_len - 1, stream);
469 if (count != header->allocated_len - 1 && ferror(stream)) {
470 sr_err("Failed to read %s: %s", filename, g_strerror(errno));
472 g_string_free(header, TRUE);
476 g_string_set_size(header, count);
478 meta = g_hash_table_new(NULL, NULL);
479 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILENAME),
481 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILESIZE),
482 GSIZE_TO_POINTER(MIN(filesize, G_MAXSSIZE)));
483 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_HEADER),
486 avail_metadata[midx++] = SR_INPUT_META_FILENAME;
487 avail_metadata[midx++] = SR_INPUT_META_FILESIZE;
488 avail_metadata[midx++] = SR_INPUT_META_HEADER;
489 avail_metadata[midx] = 0;
490 /* TODO: MIME type */
494 for (i = 0; input_module_list[i]; i++) {
495 imod = input_module_list[i];
496 if (!imod->metadata[0]) {
497 /* Module has no metadata for matching so will take
498 * any input. No point in letting it try to match. */
501 if (!check_required_metadata(imod->metadata, avail_metadata))
502 /* Cannot satisfy this module's requirements. */
505 sr_dbg("Trying module %s.", imod->id);
507 ret = imod->format_match(meta, &conf);
509 /* Module didn't recognize this buffer. */
511 } else if (ret != SR_OK) {
512 /* Module recognized this buffer, but cannot handle it. */
515 /* Found a matching module. */
516 sr_dbg("Module %s matched, confidence %u.", imod->id, conf);
517 if (conf >= best_conf)
522 g_hash_table_destroy(meta);
523 g_string_free(header, TRUE);
526 *in = sr_input_new(best_imod, NULL);
534 * Return the input instance's (virtual) device instance. This can be
535 * used to find out the number of channels and other information.
537 * If the device instance has not yet been fully populated by the input
538 * module, NULL is returned. This indicates the module needs more data
539 * to identify the number of channels and so on.
543 SR_API struct sr_dev_inst *sr_input_dev_inst_get(const struct sr_input *in)
552 * Send data to the specified input instance.
554 * When an input module instance is created with sr_input_new(), this
555 * function is used to feed data to the instance.
557 * As enough data gets fed into this function to completely populate
558 * the device instance associated with this input instance, this is
559 * guaranteed to return the moment it's ready. This gives the caller
560 * the chance to examine the device instance, attach session callbacks
565 SR_API int sr_input_send(const struct sr_input *in, GString *buf)
567 sr_spew("Sending %" G_GSIZE_FORMAT " bytes to %s module.",
568 buf->len, in->module->id);
569 return in->module->receive((struct sr_input *)in, buf);
573 * Signal the input module no more data will come.
575 * This will cause the module to process any data it may have buffered.
576 * The SR_DF_END packet will also typically be sent at this time.
580 SR_API int sr_input_end(const struct sr_input *in)
582 sr_spew("Calling end() on %s module.", in->module->id);
583 return in->module->end((struct sr_input *)in);
587 * Reset the input module's input handling structures.
589 * Causes the input module to reset its internal state so that we can re-send
590 * the input data from the beginning without having to re-create the entire
595 SR_API int sr_input_reset(const struct sr_input *in)
597 if (!in->module->reset) {
598 sr_spew("Tried to reset %s module but no reset handler found.",
603 sr_spew("Resetting %s module.", in->module->id);
604 return in->module->reset((struct sr_input *)in);
608 * Free the specified input instance and all associated resources.
612 SR_API void sr_input_free(const struct sr_input *in)
617 if (in->module->cleanup)
618 in->module->cleanup((struct sr_input *)in);
619 sr_dev_inst_free(in->sdi);
620 if (in->buf->len > 64) {
621 /* That seems more than just some sub-unitsize leftover... */
622 sr_warn("Found %" G_GSIZE_FORMAT
623 " unprocessed bytes at free time.", in->buf->len);
625 g_string_free(in->buf, TRUE);
627 g_free((gpointer)in);