session.c

   1 /*
   2  * This file is part of the sigrok-cli project.
   3  *
   4  * Copyright (C) 2013 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 <config.h>
  21 #include <glib.h>
  22 #include <glib/gstdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include "sigrok-cli.h"
  26
  27 static uint64_t limit_samples = 0;
  28 static uint64_t limit_frames = 0;
  29
  30 #ifdef HAVE_SRD
  31 extern struct srd_session *srd_sess;
  32 #endif
  33
  34 static int set_limit_time(const struct sr_dev_inst *sdi)
  35 {
  36         GVariant *gvar;
  37         uint64_t time_msec;
  38         uint64_t samplerate;
  39         struct sr_dev_driver *driver;
  40
  41         driver = sr_dev_inst_driver_get(sdi);
  42
  43         if (!(time_msec = sr_parse_timestring(opt_time))) {
  44                 g_critical("Invalid time '%s'", opt_time);
  45                 return SR_ERR;
  46         }
  47
  48         if (sr_dev_config_capabilities_list(sdi, NULL, SR_CONF_LIMIT_MSEC)
  49                         & SR_CONF_SET) {
  50                 gvar = g_variant_new_uint64(time_msec);
  51                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  52                         g_critical("Failed to configure time limit.");
  53                         return SR_ERR;
  54                 }
  55         } else if (sr_dev_config_capabilities_list(sdi, NULL, SR_CONF_SAMPLERATE)
  56                         & (SR_CONF_GET | SR_CONF_SET)) {
  57                 /* Convert to samples based on the samplerate. */
  58                 sr_config_get(driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  59                 samplerate = g_variant_get_uint64(gvar);
  60                 g_variant_unref(gvar);
  61                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  62                 if (limit_samples == 0) {
  63                         g_critical("Not enough time at this samplerate.");
  64                         return SR_ERR;
  65                 }
  66                 gvar = g_variant_new_uint64(limit_samples);
  67                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  68                         g_critical("Failed to configure time-based sample limit.");
  69                         return SR_ERR;
  70                 }
  71         } else {
  72                 g_critical("This device does not support time limits.");
  73                 return SR_ERR;
  74         }
  75
  76         return SR_OK;
  77 }
  78
  79 const struct sr_output *setup_output_format(const struct sr_dev_inst *sdi, FILE **outfile)
  80 {
  81         const struct sr_output_module *omod;
  82         const struct sr_option **options;
  83         const struct sr_output *o;
  84         GHashTable *fmtargs, *fmtopts;
  85         char *fmtspec;
  86
  87         if (!opt_output_format) {
  88                 if (opt_output_file) {
  89                         opt_output_format = DEFAULT_OUTPUT_FORMAT_FILE;
  90                 } else {
  91                         opt_output_format = DEFAULT_OUTPUT_FORMAT_NOFILE;
  92                 }
  93         }
  94
  95         fmtargs = parse_generic_arg(opt_output_format, TRUE);
  96         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
  97         if (!fmtspec)
  98                 g_critical("Invalid output format.");
  99         if (!(omod = sr_output_find(fmtspec)))
 100                 g_critical("Unknown output module '%s'.", fmtspec);
 101         g_hash_table_remove(fmtargs, "sigrok_key");
 102         if ((options = sr_output_options_get(omod))) {
 103                 fmtopts = generic_arg_to_opt(options, fmtargs);
 104                 sr_output_options_free(options);
 105         } else
 106                 fmtopts = NULL;
 107         o = sr_output_new(omod, fmtopts, sdi, opt_output_file);
 108
 109         if (opt_output_file) {
 110                 if (!sr_output_test_flag(omod, SR_OUTPUT_INTERNAL_IO_HANDLING))
 111                         *outfile = g_fopen(opt_output_file, "wb");
 112                 else
 113                         *outfile = NULL;
 114         } else {
 115                 *outfile = stdout;
 116         }
 117
 118         if (fmtopts)
 119                 g_hash_table_destroy(fmtopts);
 120         g_hash_table_destroy(fmtargs);
 121
 122         return o;
 123 }
 124
 125 const struct sr_transform *setup_transform_module(const struct sr_dev_inst *sdi)
 126 {
 127         const struct sr_transform_module *tmod;
 128         const struct sr_option **options;
 129         const struct sr_transform *t;
 130         GHashTable *fmtargs, *fmtopts;
 131         char *fmtspec;
 132
 133         if (!opt_transform_module)
 134                 opt_transform_module = "nop";
 135
 136         fmtargs = parse_generic_arg(opt_transform_module, TRUE);
 137         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 138         if (!fmtspec)
 139                 g_critical("Invalid transform module.");
 140         if (!(tmod = sr_transform_find(fmtspec)))
 141                 g_critical("Unknown transform module '%s'.", fmtspec);
 142         g_hash_table_remove(fmtargs, "sigrok_key");
 143         if ((options = sr_transform_options_get(tmod))) {
 144                 fmtopts = generic_arg_to_opt(options, fmtargs);
 145                 sr_transform_options_free(options);
 146         } else
 147                 fmtopts = NULL;
 148         t = sr_transform_new(tmod, fmtopts, sdi);
 149         if (fmtopts)
 150                 g_hash_table_destroy(fmtopts);
 151         g_hash_table_destroy(fmtargs);
 152
 153         return t;
 154 }
 155
 156 void datafeed_in(const struct sr_dev_inst *sdi,
 157                 const struct sr_datafeed_packet *packet, void *cb_data)
 158 {
 159         const struct sr_datafeed_meta *meta;
 160         const struct sr_datafeed_logic *logic;
 161         const struct sr_datafeed_analog *analog;
 162         struct sr_session *session;
 163         struct sr_config *src;
 164         static const struct sr_output *o = NULL;
 165         static const struct sr_output *oa = NULL;
 166         static uint64_t rcvd_samples_logic = 0;
 167         static uint64_t rcvd_samples_analog = 0;
 168         static uint64_t samplerate = 0;
 169         static int triggered = 0;
 170         static FILE *outfile = NULL;
 171         GSList *l;
 172         GString *out;
 173         GVariant *gvar;
 174         uint64_t end_sample;
 175         uint64_t input_len;
 176         struct sr_dev_driver *driver;
 177
 178         /* Avoid warnings when building without decoder support. */
 179         (void)session;
 180         (void)input_len;
 181
 182         driver = sr_dev_inst_driver_get(sdi);
 183
 184         /* If the first packet to come in isn't a header, don't even try. */
 185         if (packet->type != SR_DF_HEADER && !o)
 186                 return;
 187
 188         session = cb_data;
 189         switch (packet->type) {
 190         case SR_DF_HEADER:
 191                 g_debug("cli: Received SR_DF_HEADER.");
 192                 if (!(o = setup_output_format(sdi, &outfile)))
 193                         g_critical("Failed to initialize output module.");
 194
 195                 /* Set up backup analog output module. */
 196                 oa = sr_output_new(sr_output_find("analog"), NULL, sdi, NULL);
 197
 198                 rcvd_samples_logic = rcvd_samples_analog = 0;
 199
 200                 if (maybe_config_get(driver, sdi, NULL, SR_CONF_SAMPLERATE,
 201                                 &gvar) == SR_OK) {
 202                         samplerate = g_variant_get_uint64(gvar);
 203                         g_variant_unref(gvar);
 204                 }
 205
 206 #ifdef HAVE_SRD
 207                 if (opt_pds) {
 208                         if (samplerate) {
 209                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 210                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 211                                         g_critical("Failed to configure decode session.");
 212                                         break;
 213                                 }
 214                         }
 215                         if (srd_session_start(srd_sess) != SRD_OK) {
 216                                 g_critical("Failed to start decode session.");
 217                                 break;
 218                         }
 219                 }
 220 #endif
 221                 break;
 222
 223         case SR_DF_META:
 224                 g_debug("cli: Received SR_DF_META.");
 225                 meta = packet->payload;
 226                 for (l = meta->config; l; l = l->next) {
 227                         src = l->data;
 228                         switch (src->key) {
 229                         case SR_CONF_SAMPLERATE:
 230                                 samplerate = g_variant_get_uint64(src->data);
 231                                 g_debug("cli: Got samplerate %"PRIu64" Hz.", samplerate);
 232 #ifdef HAVE_SRD
 233                                 if (opt_pds) {
 234                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 235                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 236                                                 g_critical("Failed to pass samplerate to decoder.");
 237                                         }
 238                                 }
 239 #endif
 240                                 break;
 241                         case SR_CONF_SAMPLE_INTERVAL:
 242                                 samplerate = g_variant_get_uint64(src->data);
 243                                 g_debug("cli: Got sample interval %"PRIu64" ms.", samplerate);
 244                                 break;
 245                         default:
 246                                 /* Unknown metadata is not an error. */
 247                                 break;
 248                         }
 249                 }
 250                 break;
 251
 252         case SR_DF_TRIGGER:
 253                 g_debug("cli: Received SR_DF_TRIGGER.");
 254                 triggered = 1;
 255                 break;
 256
 257         case SR_DF_LOGIC:
 258                 logic = packet->payload;
 259                 g_message("cli: Received SR_DF_LOGIC (%"PRIu64" bytes, unitsize = %d).",
 260                                 logic->length, logic->unitsize);
 261                 if (logic->length == 0)
 262                         break;
 263
 264                 /* Don't store any samples until triggered. */
 265                 if (opt_wait_trigger && !triggered)
 266                         break;
 267
 268                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 269                         break;
 270
 271                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 272                 /* Cut off last packet according to the sample limit. */
 273                 if (limit_samples && end_sample > limit_samples)
 274                         end_sample = limit_samples;
 275                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 276
 277                 if (opt_pds) {
 278 #ifdef HAVE_SRD
 279                         if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 280                                         logic->data, input_len, logic->unitsize) != SRD_OK)
 281                                 sr_session_stop(session);
 282 #endif
 283                 }
 284
 285                 rcvd_samples_logic = end_sample;
 286                 break;
 287
 288         case SR_DF_ANALOG:
 289                 analog = packet->payload;
 290                 g_message("cli: Received SR_DF_ANALOG (%d samples).", analog->num_samples);
 291                 if (analog->num_samples == 0)
 292                         break;
 293
 294                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 295                         break;
 296
 297                 rcvd_samples_analog += analog->num_samples;
 298                 break;
 299
 300         case SR_DF_FRAME_BEGIN:
 301                 g_debug("cli: Received SR_DF_FRAME_BEGIN.");
 302                 break;
 303
 304         case SR_DF_FRAME_END:
 305                 g_debug("cli: Received SR_DF_FRAME_END.");
 306                 break;
 307
 308         default:
 309                 break;
 310         }
 311
 312         if (o && !opt_pds) {
 313                 if (sr_output_send(o, packet, &out) == SR_OK) {
 314                         if (!out || (out->len == 0
 315                                         && !opt_output_format
 316                                         && packet->type == SR_DF_ANALOG)) {
 317                                 /*
 318                                  * The user didn't specify an output module,
 319                                  * but needs to see this analog data.
 320                                  */
 321                                 sr_output_send(oa, packet, &out);
 322                         }
 323                         if (outfile && out && out->len > 0) {
 324                                 fwrite(out->str, 1, out->len, outfile);
 325                                 fflush(outfile);
 326                         }
 327                         if (out)
 328                                 g_string_free(out, TRUE);
 329                 }
 330         }
 331
 332         /*
 333          * SR_DF_END needs to be handled after the output module's receive()
 334          * is called, so it can properly clean up that module.
 335          */
 336         if (packet->type == SR_DF_END) {
 337                 g_debug("cli: Received SR_DF_END.");
 338
 339                 if (o)
 340                         sr_output_free(o);
 341                 o = NULL;
 342
 343                 sr_output_free(oa);
 344                 oa = NULL;
 345
 346                 if (outfile && outfile != stdout)
 347                         fclose(outfile);
 348
 349                 if (limit_samples) {
 350                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 351                                 g_warning("Device only sent %" PRIu64 " samples.",
 352                                            rcvd_samples_logic);
 353                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 354                                 g_warning("Device only sent %" PRIu64 " samples.",
 355                                            rcvd_samples_analog);
 356                 }
 357         }
 358
 359 }
 360
 361 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 362 {
 363         const struct sr_key_info *srci, *srmqi;
 364         double tmp_double, dlow, dhigh;
 365         uint64_t tmp_u64, p, q, low, high, mqflags;
 366         uint32_t mq;
 367         GVariant *rational[2], *range[2], *gtup[2];
 368         GVariantBuilder *vbl;
 369         gboolean tmp_bool;
 370         gchar **keyval;
 371         int ret, i;
 372
 373         if (!(srci = sr_key_info_name_get(SR_KEY_CONFIG, key))) {
 374                 g_critical("Unknown device option '%s'.", (char *) key);
 375                 return -1;
 376         }
 377         src->key = srci->key;
 378
 379         if ((!value || strlen(value) == 0) &&
 380                 (srci->datatype != SR_T_BOOL)) {
 381                 g_critical("Option '%s' needs a value.", (char *)key);
 382                 return -1;
 383         }
 384
 385         ret = 0;
 386         switch (srci->datatype) {
 387         case SR_T_UINT64:
 388                 ret = sr_parse_sizestring(value, &tmp_u64);
 389                 if (ret != 0)
 390                         break;
 391                 src->data = g_variant_new_uint64(tmp_u64);
 392                 break;
 393         case SR_T_INT32:
 394                 ret = sr_parse_sizestring(value, &tmp_u64);
 395                 if (ret != 0)
 396                         break;
 397                 src->data = g_variant_new_int32(tmp_u64);
 398                 break;
 399         case SR_T_STRING:
 400                 src->data = g_variant_new_string(value);
 401                 break;
 402         case SR_T_BOOL:
 403                 if (!value)
 404                         tmp_bool = TRUE;
 405                 else
 406                         tmp_bool = sr_parse_boolstring(value);
 407                 src->data = g_variant_new_boolean(tmp_bool);
 408                 break;
 409         case SR_T_FLOAT:
 410                 tmp_double = strtof(value, NULL);
 411                 src->data = g_variant_new_double(tmp_double);
 412                 break;
 413         case SR_T_RATIONAL_PERIOD:
 414                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 415                         break;
 416                 rational[0] = g_variant_new_uint64(p);
 417                 rational[1] = g_variant_new_uint64(q);
 418                 src->data = g_variant_new_tuple(rational, 2);
 419                 break;
 420         case SR_T_RATIONAL_VOLT:
 421                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 422                         break;
 423                 rational[0] = g_variant_new_uint64(p);
 424                 rational[1] = g_variant_new_uint64(q);
 425                 src->data = g_variant_new_tuple(rational, 2);
 426                 break;
 427         case SR_T_UINT64_RANGE:
 428                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 429                         ret = -1;
 430                         break;
 431                 } else {
 432                         range[0] = g_variant_new_uint64(low);
 433                         range[1] = g_variant_new_uint64(high);
 434                         src->data = g_variant_new_tuple(range, 2);
 435                 }
 436                 break;
 437         case SR_T_DOUBLE_RANGE:
 438                 if (sscanf(value, "%lf-%lf", &dlow, &dhigh) != 2) {
 439                         ret = -1;
 440                         break;
 441                 } else {
 442                         range[0] = g_variant_new_double(dlow);
 443                         range[1] = g_variant_new_double(dhigh);
 444                         src->data = g_variant_new_tuple(range, 2);
 445                 }
 446                 break;
 447         case SR_T_KEYVALUE:
 448                 /* Expects the argument to be in the form of key=value. */
 449                 keyval = g_strsplit(value, "=", 2);
 450                 if (!keyval[0] || !keyval[1]) {
 451                         g_strfreev(keyval);
 452                         ret = -1;
 453                         break;
 454                 } else {
 455                         vbl = g_variant_builder_new(G_VARIANT_TYPE_DICTIONARY);
 456                         g_variant_builder_add(vbl, "{ss}",
 457                                               keyval[0], keyval[1]);
 458                         src->data = g_variant_builder_end(vbl);
 459                         g_strfreev(keyval);
 460                 }
 461                 break;
 462         case SR_T_MQ:
 463                 /*
 464                   Argument is MQ id e.g. ("voltage") optionally followed by one
 465                   or more /<mqflag> e.g. "/ac".
 466                  */
 467                 keyval = g_strsplit(value, "/", 0);
 468                 if (!keyval[0] || !(srmqi = sr_key_info_name_get(SR_KEY_MQ, keyval[0]))) {
 469                         g_strfreev(keyval);
 470                         ret = -1;
 471                         break;
 472                 }
 473                 mq = srmqi->key;
 474                 mqflags = 0;
 475                 for (i = 1; keyval[i]; i++) {
 476                         if (!(srmqi = sr_key_info_name_get(SR_KEY_MQFLAGS, keyval[i]))) {
 477                                 ret = -1;
 478                                 break;
 479                         }
 480                         mqflags |= srmqi->key;
 481                 }
 482                 g_strfreev(keyval);
 483                 if (ret != -1) {
 484                         gtup[0] = g_variant_new_uint32(mq);
 485                         gtup[1] = g_variant_new_uint64(mqflags);
 486                         src->data = g_variant_new_tuple(gtup, 2);
 487                 }
 488                 break;
 489         default:
 490                 g_critical("Unknown data type specified for option '%s' "
 491                            "(driver implementation bug?).", key);
 492                 ret = -1;
 493         }
 494
 495         if (ret < 0)
 496                 g_critical("Invalid value: '%s' for option '%s'", value, key);
 497
 498         return ret;
 499 }
 500
 501 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 502 {
 503         struct sr_config src;
 504         struct sr_channel_group *cg;
 505         GHashTableIter iter;
 506         gpointer key, value;
 507         int ret;
 508
 509         g_hash_table_iter_init(&iter, args);
 510         while (g_hash_table_iter_next(&iter, &key, &value)) {
 511                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 512                         return ret;
 513                 cg = select_channel_group(sdi);
 514                 if ((ret = maybe_config_set(sr_dev_inst_driver_get(sdi), sdi, cg,
 515                                 src.key, src.data)) != SR_OK) {
 516                         g_critical("Failed to set device option '%s': %s.",
 517                                    (char *)key, sr_strerror(ret));
 518                         return ret;
 519                 }
 520         }
 521
 522         return SR_OK;
 523 }
 524
 525 void run_session(void)
 526 {
 527         GSList *devices, *real_devices, *sd;
 528         GHashTable *devargs;
 529         GVariant *gvar;
 530         struct sr_session *session;
 531         struct sr_trigger *trigger;
 532         struct sr_dev_inst *sdi;
 533         uint64_t min_samples, max_samples;
 534         GArray *drv_opts;
 535         guint i;
 536         int is_demo_dev;
 537         struct sr_dev_driver *driver;
 538         const struct sr_transform *t;
 539         GMainLoop *main_loop;
 540
 541         devices = device_scan();
 542         if (!devices) {
 543                 g_critical("No devices found.");
 544                 return;
 545         }
 546
 547         real_devices = NULL;
 548         for (sd = devices; sd; sd = sd->next) {
 549                 sdi = sd->data;
 550
 551                 driver = sr_dev_inst_driver_get(sdi);
 552
 553                 if (!(drv_opts = sr_dev_options(driver, NULL, NULL))) {
 554                         g_critical("Failed to query list of driver options.");
 555                         return;
 556                 }
 557
 558                 is_demo_dev = 0;
 559                 for (i = 0; i < drv_opts->len; i++) {
 560                         if (g_array_index(drv_opts, uint32_t, i) == SR_CONF_DEMO_DEV)
 561                                 is_demo_dev = 1;
 562                 }
 563
 564                 g_array_free(drv_opts, TRUE);
 565
 566                 if (!is_demo_dev)
 567                         real_devices = g_slist_append(real_devices, sdi);
 568         }
 569
 570         if (g_slist_length(devices) > 1) {
 571                 if (g_slist_length(real_devices) != 1) {
 572                         g_critical("sigrok-cli only supports one device for capturing.");
 573                         return;
 574                 } else {
 575                         /* We only have one non-demo device. */
 576                         g_slist_free(devices);
 577                         devices = real_devices;
 578                         real_devices = NULL;
 579                 }
 580         }
 581
 582         sdi = devices->data;
 583         g_slist_free(devices);
 584         g_slist_free(real_devices);
 585
 586         sr_session_new(sr_ctx, &session);
 587         sr_session_datafeed_callback_add(session, datafeed_in, NULL);
 588
 589         if (sr_dev_open(sdi) != SR_OK) {
 590                 g_critical("Failed to open device.");
 591                 return;
 592         }
 593
 594         if (sr_session_dev_add(session, sdi) != SR_OK) {
 595                 g_critical("Failed to add device to session.");
 596                 sr_session_destroy(session);
 597                 return;
 598         }
 599
 600         if (opt_config) {
 601                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 602                         if (set_dev_options(sdi, devargs) != SR_OK)
 603                                 return;
 604                         g_hash_table_destroy(devargs);
 605                 }
 606         }
 607
 608         if (select_channels(sdi) != SR_OK) {
 609                 g_critical("Failed to set channels.");
 610                 sr_session_destroy(session);
 611                 return;
 612         }
 613
 614         trigger = NULL;
 615         if (opt_triggers) {
 616                 if (!parse_triggerstring(sdi, opt_triggers, &trigger)) {
 617                         sr_session_destroy(session);
 618                         return;
 619                 }
 620                 if (sr_session_trigger_set(session, trigger) != SR_OK) {
 621                         sr_session_destroy(session);
 622                         return;
 623                 }
 624         }
 625
 626         if (opt_continuous) {
 627                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 628                         g_critical("This device does not support continuous sampling.");
 629                         sr_session_destroy(session);
 630                         return;
 631                 }
 632         }
 633
 634         if (opt_time) {
 635                 if (set_limit_time(sdi) != SR_OK) {
 636                         sr_session_destroy(session);
 637                         return;
 638                 }
 639         }
 640
 641         if (opt_samples) {
 642                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 643                         g_critical("Invalid sample limit '%s'.", opt_samples);
 644                         sr_session_destroy(session);
 645                         return;
 646                 }
 647                 if (maybe_config_list(driver, sdi, NULL, SR_CONF_LIMIT_SAMPLES,
 648                                 &gvar) == SR_OK) {
 649                         /*
 650                          * The device has no compression, or compression is turned
 651                          * off, and publishes its sample memory size.
 652                          */
 653                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 654                         g_variant_unref(gvar);
 655                         if (limit_samples < min_samples) {
 656                                 g_critical("The device stores at least %"PRIu64
 657                                                 " samples with the current settings.", min_samples);
 658                         }
 659                         if (limit_samples > max_samples) {
 660                                 g_critical("The device can store only %"PRIu64
 661                                                 " samples with the current settings.", max_samples);
 662                         }
 663                 }
 664                 gvar = g_variant_new_uint64(limit_samples);
 665                 if (maybe_config_set(sr_dev_inst_driver_get(sdi), sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 666                         g_critical("Failed to configure sample limit.");
 667                         sr_session_destroy(session);
 668                         return;
 669                 }
 670         }
 671
 672         if (opt_frames) {
 673                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 674                         g_critical("Invalid sample limit '%s'.", opt_samples);
 675                         sr_session_destroy(session);
 676                         return;
 677                 }
 678                 gvar = g_variant_new_uint64(limit_frames);
 679                 if (maybe_config_set(sr_dev_inst_driver_get(sdi), sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 680                         g_critical("Failed to configure frame limit.");
 681                         sr_session_destroy(session);
 682                         return;
 683                 }
 684         }
 685
 686         if (!(t = setup_transform_module(sdi)))
 687                 g_critical("Failed to initialize transform module.");
 688
 689         main_loop = g_main_loop_new(NULL, FALSE);
 690
 691         sr_session_stopped_callback_set(session,
 692                 (sr_session_stopped_callback)g_main_loop_quit, main_loop);
 693
 694         if (sr_session_start(session) != SR_OK) {
 695                 g_critical("Failed to start session.");
 696                 g_main_loop_unref(main_loop);
 697                 sr_session_destroy(session);
 698                 return;
 699         }
 700
 701         if (opt_continuous)
 702                 add_anykey(session);
 703
 704         g_main_loop_run(main_loop);
 705
 706         if (opt_continuous)
 707                 clear_anykey();
 708
 709         if (trigger)
 710                 sr_trigger_free(trigger);
 711
 712         sr_session_datafeed_callback_remove_all(session);
 713         g_main_loop_unref(main_loop);
 714         sr_session_destroy(session);
 715 }