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"
33 #define CHUNK_SIZE (4 * 1024 * 1024)
39 * Input module handling.
43 * @defgroup grp_input Input modules
45 * Input file/data module handling.
47 * libsigrok can process acquisition data in several different ways.
48 * Aside from acquiring data from a hardware device, it can also take it
49 * from a file in various formats (binary, CSV, VCD, and so on).
51 * Like all libsigrok data handling, processing is done in a streaming
52 * manner: input should be supplied a chunk at a time. This way anything
53 * that processes data can do so in real time, without the user having
54 * to wait for the whole thing to be finished.
56 * Every input module is "pluggable", meaning it's handled as being separate
57 * from the main libsigrok, but linked in to it statically. To keep things
58 * modular and separate like this, functions within an input module should be
59 * declared static, with only the respective 'struct sr_input_module' being
60 * exported for use into the wider libsigrok namespace.
66 extern SR_PRIV struct sr_input_module input_chronovu_la8;
67 extern SR_PRIV struct sr_input_module input_csv;
68 extern SR_PRIV struct sr_input_module input_binary;
69 extern SR_PRIV struct sr_input_module input_trace32_ad;
70 extern SR_PRIV struct sr_input_module input_vcd;
71 extern SR_PRIV struct sr_input_module input_wav;
72 extern SR_PRIV struct sr_input_module input_raw_analog;
73 extern SR_PRIV struct sr_input_module input_logicport;
74 extern SR_PRIV struct sr_input_module input_null;
77 static const struct sr_input_module *input_module_list[] = {
91 * Returns a NULL-terminated list of all available input modules.
95 SR_API const struct sr_input_module **sr_input_list(void)
97 return input_module_list;
101 * Returns the specified input module's ID.
105 SR_API const char *sr_input_id_get(const struct sr_input_module *imod)
108 sr_err("Invalid input module NULL!");
116 * Returns the specified input module's name.
120 SR_API const char *sr_input_name_get(const struct sr_input_module *imod)
123 sr_err("Invalid input module NULL!");
131 * Returns the specified input module's description.
135 SR_API const char *sr_input_description_get(const struct sr_input_module *imod)
138 sr_err("Invalid input module NULL!");
146 * Returns the specified input module's file extensions typical for the file
147 * format, as a NULL terminated array, or returns a NULL pointer if there is
148 * no preferred extension.
149 * @note these are a suggestions only.
153 SR_API const char *const *sr_input_extensions_get(
154 const struct sr_input_module *imod)
157 sr_err("Invalid input module NULL!");
165 * Return the input module with the specified ID, or NULL if no module
166 * with that id is found.
170 SR_API const struct sr_input_module *sr_input_find(char *id)
174 for (i = 0; input_module_list[i]; i++) {
175 if (!strcmp(input_module_list[i]->id, id))
176 return input_module_list[i];
183 * Returns a NULL-terminated array of struct sr_option, or NULL if the
184 * module takes no options.
186 * Each call to this function must be followed by a call to
187 * sr_input_options_free().
191 SR_API const struct sr_option **sr_input_options_get(const struct sr_input_module *imod)
193 const struct sr_option *mod_opts, **opts;
196 if (!imod || !imod->options)
199 mod_opts = imod->options();
201 for (size = 0; mod_opts[size].id; size++)
203 opts = g_malloc((size + 1) * sizeof(struct sr_option *));
205 for (i = 0; i < size; i++)
206 opts[i] = &mod_opts[i];
213 * After a call to sr_input_options_get(), this function cleans up all
214 * resources returned by that call.
218 SR_API void sr_input_options_free(const struct sr_option **options)
225 for (i = 0; options[i]; i++) {
226 if (options[i]->def) {
227 g_variant_unref(options[i]->def);
228 ((struct sr_option *)options[i])->def = NULL;
231 if (options[i]->values) {
232 g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref);
233 ((struct sr_option *)options[i])->values = NULL;
240 * Create a new input instance using the specified input module.
242 * This function is used when a client wants to use a specific input
243 * module to parse a stream. No effort is made to identify the format.
245 * @param imod The input module to use. Must not be NULL.
246 * @param options GHashTable consisting of keys corresponding with
247 * the module options @c id field. The values should be GVariant
248 * pointers with sunk references, of the same GVariantType as the option's
253 SR_API struct sr_input *sr_input_new(const struct sr_input_module *imod,
257 const struct sr_option *mod_opts;
258 const GVariantType *gvt;
259 GHashTable *new_opts;
264 in = g_malloc0(sizeof(struct sr_input));
267 new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
268 (GDestroyNotify)g_variant_unref);
270 mod_opts = imod->options();
271 for (i = 0; mod_opts[i].id; i++) {
272 if (options && g_hash_table_lookup_extended(options,
273 mod_opts[i].id, &key, &value)) {
274 /* Option not given: insert the default value. */
275 gvt = g_variant_get_type(mod_opts[i].def);
276 if (!g_variant_is_of_type(value, gvt)) {
277 sr_err("Invalid type for '%s' option.",
282 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
283 g_variant_ref(value));
285 /* Pass option along. */
286 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
287 g_variant_ref(mod_opts[i].def));
291 /* Make sure no invalid options were given. */
293 g_hash_table_iter_init(&iter, options);
294 while (g_hash_table_iter_next(&iter, &key, &value)) {
295 if (!g_hash_table_lookup(new_opts, key)) {
296 sr_err("Input module '%s' has no option '%s'",
297 imod->id, (char *)key);
298 g_hash_table_destroy(new_opts);
306 if (in->module->init && in->module->init(in, new_opts) != SR_OK) {
310 in->buf = g_string_sized_new(128);
314 g_hash_table_destroy(new_opts);
319 /* Returns TRUE if all required meta items are available. */
320 static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail)
325 for (m = 0; metadata[m]; m++) {
326 if (!(metadata[m] & SR_INPUT_META_REQUIRED))
328 reqd = metadata[m] & ~SR_INPUT_META_REQUIRED;
329 for (a = 0; avail[a]; a++) {
330 if (avail[a] == reqd)
334 /* Found a required meta item that isn't available. */
342 * Try to find an input module that can parse the given buffer.
344 * The buffer must contain enough of the beginning of the file for
345 * the input modules to find a match. This is format-dependent. When
346 * magic strings get checked, 128 bytes normally could be enough. Note
347 * that some formats try to parse larger header sections, and benefit
348 * from seeing a larger scope.
350 * If an input module is found, an instance is created into *in.
351 * Otherwise, *in contains NULL. When multiple input moduless claim
352 * support for the format, the one with highest confidence takes
353 * precedence. Applications will see at most one input module spec.
355 * If an instance is created, it has the given buffer used for scanning
356 * already submitted to it, to be processed before more data is sent.
357 * This allows a frontend to submit an initial chunk of a non-seekable
358 * stream, such as stdin, without having to keep it around and submit
362 SR_API int sr_input_scan_buffer(GString *buf, const struct sr_input **in)
364 const struct sr_input_module *imod, *best_imod;
367 unsigned int conf, best_conf;
369 uint8_t mitem, avail_metadata[8];
371 /* No more metadata to be had from a buffer. */
372 avail_metadata[0] = SR_INPUT_META_HEADER;
373 avail_metadata[1] = 0;
378 for (i = 0; input_module_list[i]; i++) {
379 imod = input_module_list[i];
380 if (!imod->metadata[0]) {
381 /* Module has no metadata for matching so will take
382 * any input. No point in letting it try to match. */
385 if (!check_required_metadata(imod->metadata, avail_metadata))
386 /* Cannot satisfy this module's requirements. */
389 meta = g_hash_table_new(NULL, NULL);
390 for (m = 0; m < sizeof(imod->metadata); m++) {
391 mitem = imod->metadata[m] & ~SR_INPUT_META_REQUIRED;
392 if (mitem == SR_INPUT_META_HEADER)
393 g_hash_table_insert(meta, GINT_TO_POINTER(mitem), buf);
395 if (g_hash_table_size(meta) == 0) {
396 /* No metadata for this module, so nothing to match. */
397 g_hash_table_destroy(meta);
400 sr_spew("Trying module %s.", imod->id);
401 ret = imod->format_match(meta, &conf);
402 g_hash_table_destroy(meta);
403 if (ret == SR_ERR_DATA) {
404 /* Module recognized this buffer, but cannot handle it. */
406 } else if (ret == SR_ERR) {
407 /* Module didn't recognize this buffer. */
409 } else if (ret != SR_OK) {
410 /* Can be SR_ERR_NA. */
414 /* Found a matching module. */
415 sr_spew("Module %s matched, confidence %u.", imod->id, conf);
416 if (conf >= best_conf)
423 *in = sr_input_new(best_imod, NULL);
424 g_string_insert_len((*in)->buf, 0, buf->str, buf->len);
432 * Try to find an input module that can parse the given file.
434 * If an input module is found, an instance is created into *in.
435 * Otherwise, *in contains NULL. When multiple input moduless claim
436 * support for the format, the one with highest confidence takes
437 * precedence. Applications will see at most one input module spec.
440 SR_API int sr_input_scan_file(const char *filename, const struct sr_input **in)
444 const struct sr_input_module *imod, *best_imod;
448 unsigned int midx, i;
449 unsigned int conf, best_conf;
451 uint8_t avail_metadata[8];
455 if (!filename || !filename[0]) {
456 sr_err("Invalid filename.");
459 stream = g_fopen(filename, "rb");
461 sr_err("Failed to open %s: %s", filename, g_strerror(errno));
464 filesize = sr_file_get_size(stream);
466 sr_err("Failed to get size of %s: %s",
467 filename, g_strerror(errno));
471 header = g_string_sized_new(CHUNK_SIZE);
472 count = fread(header->str, 1, header->allocated_len - 1, stream);
473 if (count < 1 || ferror(stream)) {
474 sr_err("Failed to read %s: %s", filename, g_strerror(errno));
476 g_string_free(header, TRUE);
480 g_string_set_size(header, count);
482 meta = g_hash_table_new(NULL, NULL);
483 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILENAME),
485 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILESIZE),
486 GSIZE_TO_POINTER(MIN(filesize, G_MAXSSIZE)));
487 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_HEADER),
490 avail_metadata[midx++] = SR_INPUT_META_FILENAME;
491 avail_metadata[midx++] = SR_INPUT_META_FILESIZE;
492 avail_metadata[midx++] = SR_INPUT_META_HEADER;
493 avail_metadata[midx] = 0;
494 /* TODO: MIME type */
498 for (i = 0; input_module_list[i]; i++) {
499 imod = input_module_list[i];
500 if (!imod->metadata[0]) {
501 /* Module has no metadata for matching so will take
502 * any input. No point in letting it try to match. */
505 if (!check_required_metadata(imod->metadata, avail_metadata))
506 /* Cannot satisfy this module's requirements. */
509 sr_dbg("Trying module %s.", imod->id);
511 ret = imod->format_match(meta, &conf);
513 /* Module didn't recognize this buffer. */
515 } else if (ret != SR_OK) {
516 /* Module recognized this buffer, but cannot handle it. */
519 /* Found a matching module. */
520 sr_dbg("Module %s matched, confidence %u.", imod->id, conf);
521 if (conf >= best_conf)
526 g_hash_table_destroy(meta);
527 g_string_free(header, TRUE);
530 *in = sr_input_new(best_imod, NULL);
538 * Return the input instance's module "class". This can be used to find out
539 * which input module handles a specific input file. This is especially
540 * useful when an application did not create the input stream by specifying
541 * an input module, but instead some shortcut or convenience wrapper did.
545 SR_API const struct sr_input_module *sr_input_module_get(const struct sr_input *in)
554 * Return the input instance's (virtual) device instance. This can be
555 * used to find out the number of channels and other information.
557 * If the device instance has not yet been fully populated by the input
558 * module, NULL is returned. This indicates the module needs more data
559 * to identify the number of channels and so on.
563 SR_API struct sr_dev_inst *sr_input_dev_inst_get(const struct sr_input *in)
572 * Send data to the specified input instance.
574 * When an input module instance is created with sr_input_new(), this
575 * function is used to feed data to the instance.
577 * As enough data gets fed into this function to completely populate
578 * the device instance associated with this input instance, this is
579 * guaranteed to return the moment it's ready. This gives the caller
580 * the chance to examine the device instance, attach session callbacks
585 SR_API int sr_input_send(const struct sr_input *in, GString *buf)
589 len = buf ? buf->len : 0;
590 sr_spew("Sending %zu bytes to %s module.", len, in->module->id);
591 return in->module->receive((struct sr_input *)in, buf);
595 * Signal the input module no more data will come.
597 * This will cause the module to process any data it may have buffered.
598 * The SR_DF_END packet will also typically be sent at this time.
602 SR_API int sr_input_end(const struct sr_input *in)
604 sr_spew("Calling end() on %s module.", in->module->id);
605 return in->module->end((struct sr_input *)in);
609 * Reset the input module's input handling structures.
611 * Causes the input module to reset its internal state so that we can re-send
612 * the input data from the beginning without having to re-create the entire
617 SR_API int sr_input_reset(const struct sr_input *in_ro)
622 in = (struct sr_input *)in_ro; /* "un-const" */
623 if (!in || !in->module)
627 * Run the optional input module's .reset() method. This shall
628 * take care of the context (kept in the 'inc' variable).
630 if (in->module->reset) {
631 sr_spew("Resetting %s module.", in->module->id);
632 rc = in->module->reset(in);
634 sr_spew("Tried to reset %s module but no reset handler found.",
640 * Handle input module status (kept in the 'in' variable) here
641 * in common logic. This agrees with how input module's receive()
642 * and end() routines "amend but never seed" the 'in' information.
644 * Void potentially accumulated receive() buffer content, and
645 * clear the sdi_ready flag. This makes sure that subsequent
646 * processing will scan the header again before sample data gets
647 * interpreted, and stale content from previous calls won't affect
650 * This common logic does not harm when the input module implements
651 * .reset() and contains identical assignments. In the absence of
652 * an individual .reset() method, simple input modules can completely
653 * rely on common code and keep working across resets.
656 g_string_truncate(in->buf, 0);
657 in->sdi_ready = FALSE;
663 * Free the specified input instance and all associated resources.
667 SR_API void sr_input_free(const struct sr_input *in)
673 * Run the input module's optional .cleanup() routine. This
674 * takes care of the context (kept in the 'inc' variable).
676 if (in->module->cleanup)
677 in->module->cleanup((struct sr_input *)in);
680 * Common code releases the input module's state (kept in the
681 * 'in' variable). Release the device instance, the receive()
682 * buffer, the shallow 'in->priv' block which is 'inc' (after
683 * .cleanup() released potentially nested resources under 'inc').
685 sr_dev_inst_free(in->sdi);
686 if (in->buf->len > 64) {
687 /* That seems more than just some sub-unitsize leftover... */
688 sr_warn("Found %" G_GSIZE_FORMAT
689 " unprocessed bytes at free time.", in->buf->len);
691 g_string_free(in->buf, TRUE);
693 g_free((gpointer)in);