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 "sigrok-cli.h"
  21 #include <glib.h>
  22 #include <glib/gstdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 static int default_output_format = FALSE;
  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
  40         if (!(time_msec = sr_parse_timestring(opt_time))) {
  41                 g_critical("Invalid time '%s'", opt_time);
  42                 return SR_ERR;
  43         }
  44
  45         if (sr_dev_has_option(sdi, SR_CONF_LIMIT_MSEC)) {
  46                 gvar = g_variant_new_uint64(time_msec);
  47                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  48                         g_critical("Failed to configure time limit.");
  49                         return SR_ERR;
  50                 }
  51         } else if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
  52                 /* Convert to samples based on the samplerate.  */
  53                 sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  54                 samplerate = g_variant_get_uint64(gvar);
  55                 g_variant_unref(gvar);
  56                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  57                 if (limit_samples == 0) {
  58                         g_critical("Not enough time at this samplerate.");
  59                         return SR_ERR;
  60                 }
  61                 gvar = g_variant_new_uint64(limit_samples);
  62                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  63                         g_critical("Failed to configure time-based sample limit.");
  64                         return SR_ERR;
  65                 }
  66         } else {
  67                 g_critical("This device does not support time limits.");
  68                 return SR_ERR;
  69         }
  70
  71         return SR_OK;
  72 }
  73
  74 const struct sr_output *setup_output_format(const struct sr_dev_inst *sdi)
  75 {
  76         const struct sr_output_module *omod;
  77         const struct sr_option **options;
  78         const struct sr_output *o;
  79         GHashTable *fmtargs, *fmtopts;
  80         char *fmtspec;
  81
  82         if (opt_output_format && !strcmp(opt_output_format, "sigrok")) {
  83                 /* Doesn't really exist as an output module - this is
  84                  * the session save mode. */
  85                 g_free(opt_output_format);
  86                 opt_output_format = NULL;
  87         }
  88
  89         if (!opt_output_format) {
  90                 opt_output_format = DEFAULT_OUTPUT_FORMAT;
  91                 /* we'll need to remember this so when saving to a file
  92                  * later, sigrok session format will be used.
  93                  */
  94                 default_output_format = TRUE;
  95         }
  96
  97         fmtargs = parse_generic_arg(opt_output_format, TRUE);
  98         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
  99         if (!fmtspec)
 100                 g_critical("Invalid output format.");
 101         if (!(omod = sr_output_find(fmtspec)))
 102                 g_critical("Unknown output module '%s'.", fmtspec);
 103         g_hash_table_remove(fmtargs, "sigrok_key");
 104         if ((options = sr_output_options_get(omod))) {
 105                 fmtopts = generic_arg_to_opt(options, fmtargs);
 106                 sr_output_options_free(options);
 107         } else
 108                 fmtopts = NULL;
 109         o = sr_output_new(omod, fmtopts, sdi);
 110         if (fmtopts)
 111                 g_hash_table_destroy(fmtopts);
 112         g_hash_table_destroy(fmtargs);
 113
 114         return o;
 115 }
 116
 117 void datafeed_in(const struct sr_dev_inst *sdi,
 118                 const struct sr_datafeed_packet *packet, void *cb_data)
 119 {
 120         const struct sr_datafeed_meta *meta;
 121         const struct sr_datafeed_logic *logic;
 122         const struct sr_datafeed_analog *analog;
 123         struct sr_session *session;
 124         struct sr_config *src;
 125         struct sr_channel *ch;
 126         static const struct sr_output *o = NULL;
 127         static const struct sr_output *oa = NULL;
 128         static uint64_t rcvd_samples_logic = 0;
 129         static uint64_t rcvd_samples_analog = 0;
 130         static uint64_t samplerate = 0;
 131         static int triggered = 0;
 132         static FILE *outfile = NULL;
 133         GSList *l;
 134         GString *out;
 135         GVariant *gvar;
 136         uint64_t end_sample;
 137         uint64_t input_len;
 138         int i;
 139         char **channels;
 140
 141         /* If the first packet to come in isn't a header, don't even try. */
 142         if (packet->type != SR_DF_HEADER && o == NULL)
 143                 return;
 144
 145         session = cb_data;
 146         switch (packet->type) {
 147         case SR_DF_HEADER:
 148                 g_debug("cli: Received SR_DF_HEADER.");
 149                 if (!(o = setup_output_format(sdi)))
 150                         g_critical("Failed to initialize output module.");
 151
 152                 /* Set up backup analog output module. */
 153                 oa = sr_output_new(sr_output_find("analog"), NULL, sdi);
 154
 155                 /* Prepare non-stdout output. */
 156                 outfile = stdout;
 157                 if (opt_output_file) {
 158                         if (default_output_format) {
 159                                 outfile = NULL;
 160                         } else {
 161                                 /* saving to a file in whatever format was set
 162                                  * with --format, so all we need is a filehandle */
 163                                 outfile = g_fopen(opt_output_file, "wb");
 164                         }
 165                 }
 166                 rcvd_samples_logic = rcvd_samples_analog = 0;
 167
 168                 if (sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE,
 169                                 &gvar) == SR_OK) {
 170                         samplerate = g_variant_get_uint64(gvar);
 171                         g_variant_unref(gvar);
 172                 }
 173
 174 #ifdef HAVE_SRD
 175                 if (opt_pds) {
 176                         if (samplerate) {
 177                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 178                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 179                                         g_critical("Failed to configure decode session.");
 180                                         break;
 181                                 }
 182                         }
 183                         if (srd_session_start(srd_sess) != SRD_OK) {
 184                                 g_critical("Failed to start decode session.");
 185                                 break;
 186                         }
 187                 }
 188 #endif
 189                 break;
 190
 191         case SR_DF_META:
 192                 g_debug("cli: Received SR_DF_META.");
 193                 meta = packet->payload;
 194                 for (l = meta->config; l; l = l->next) {
 195                         src = l->data;
 196                         switch (src->key) {
 197                         case SR_CONF_SAMPLERATE:
 198                                 samplerate = g_variant_get_uint64(src->data);
 199                                 g_debug("cli: Got samplerate %"PRIu64" Hz.", samplerate);
 200 #ifdef HAVE_SRD
 201                                 if (opt_pds) {
 202                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 203                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 204                                                 g_critical("Failed to pass samplerate to decoder.");
 205                                         }
 206                                 }
 207 #endif
 208                                 break;
 209                         case SR_CONF_SAMPLE_INTERVAL:
 210                                 samplerate = g_variant_get_uint64(src->data);
 211                                 g_debug("cli: Got sample interval %"PRIu64" ms.", samplerate);
 212                                 break;
 213                         default:
 214                                 /* Unknown metadata is not an error. */
 215                                 break;
 216                         }
 217                 }
 218                 break;
 219
 220         case SR_DF_TRIGGER:
 221                 g_debug("cli: Received SR_DF_TRIGGER.");
 222                 triggered = 1;
 223                 break;
 224
 225         case SR_DF_LOGIC:
 226                 logic = packet->payload;
 227                 g_message("cli: Received SR_DF_LOGIC (%"PRIu64" bytes, unitsize = %d).",
 228                                 logic->length, logic->unitsize);
 229                 if (logic->length == 0)
 230                         break;
 231
 232                 /* Don't store any samples until triggered. */
 233                 if (opt_wait_trigger && !triggered)
 234                         break;
 235
 236                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 237                         break;
 238
 239                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 240                 /* Cut off last packet according to the sample limit. */
 241                 if (limit_samples && end_sample > limit_samples)
 242                         end_sample = limit_samples;
 243                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 244
 245                 if (opt_output_file && default_output_format) {
 246                         /* Saving to a session file. */
 247                         if (rcvd_samples_logic == 0) {
 248                                 /* First packet with logic data, init session file. */
 249                                 channels = g_malloc(sizeof(char *) * g_slist_length(sdi->channels));
 250                                 for (i = 0, l = sdi->channels; l; l = l->next) {
 251                                         ch = l->data;
 252                                         if (ch->enabled && ch->type == SR_CHANNEL_LOGIC)
 253                                                 channels[i++] = ch->name;
 254                                 }
 255                                 channels[i] = NULL;
 256                                 sr_session_save_init(session, opt_output_file,
 257                                                 samplerate, channels);
 258                                 g_free(channels);
 259                         }
 260                         save_chunk_logic(session, logic->data, input_len, logic->unitsize);
 261                 } else {
 262                         if (opt_pds) {
 263 #ifdef HAVE_SRD
 264                                 if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 265                                                 logic->data, input_len) != SRD_OK)
 266                                         sr_session_stop(session);
 267 #endif
 268                         }
 269                 }
 270
 271                 rcvd_samples_logic = end_sample;
 272                 break;
 273
 274         case SR_DF_ANALOG:
 275                 analog = packet->payload;
 276                 g_message("cli: Received SR_DF_ANALOG (%d samples).", analog->num_samples);
 277                 if (analog->num_samples == 0)
 278                         break;
 279
 280                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 281                         break;
 282
 283                 rcvd_samples_analog += analog->num_samples;
 284                 break;
 285
 286         case SR_DF_FRAME_BEGIN:
 287                 g_debug("cli: Received SR_DF_FRAME_BEGIN.");
 288                 break;
 289
 290         case SR_DF_FRAME_END:
 291                 g_debug("cli: Received SR_DF_FRAME_END.");
 292                 break;
 293
 294         default:
 295                 break;
 296         }
 297
 298         if (o && outfile && !opt_pds) {
 299                 if (sr_output_send(o, packet, &out) == SR_OK) {
 300                         if (!out || (out->len == 0 && default_output_format
 301                                         && packet->type == SR_DF_ANALOG)) {
 302                                 /* The user didn't specify an output module,
 303                                  * but needs to see this analog data. */
 304                                 sr_output_send(oa, packet, &out);
 305                         }
 306                         if (out && out->len > 0) {
 307                                 fwrite(out->str, 1, out->len, outfile);
 308                                 fflush(outfile);
 309                         }
 310                         if (out)
 311                                 g_string_free(out, TRUE);
 312                 }
 313         }
 314
 315         /* SR_DF_END needs to be handled after the output module's receive()
 316          * is called, so it can properly clean up that module. */
 317         if (packet->type == SR_DF_END) {
 318                 g_debug("cli: Received SR_DF_END.");
 319
 320                 if (o)
 321                         sr_output_free(o);
 322                 o = NULL;
 323
 324                 sr_output_free(oa);
 325                 oa = NULL;
 326
 327                 if (outfile && outfile != stdout)
 328                         fclose(outfile);
 329
 330                 if (opt_output_file && default_output_format)
 331                         /* Flush whatever is left out to the session file. */
 332                         save_chunk_logic(session, NULL, 0, 0);
 333
 334                 if (limit_samples) {
 335                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 336                                 g_warning("Device only sent %" PRIu64 " samples.",
 337                                            rcvd_samples_logic);
 338                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 339                                 g_warning("Device only sent %" PRIu64 " samples.",
 340                                            rcvd_samples_analog);
 341                 }
 342         }
 343
 344 }
 345
 346 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 347 {
 348         const struct sr_config_info *srci;
 349         double tmp_double, dlow, dhigh;
 350         uint64_t tmp_u64, p, q, low, high;
 351         GVariant *rational[2], *range[2];
 352         gboolean tmp_bool;
 353         int ret;
 354
 355         if (!(srci = sr_config_info_name_get(key))) {
 356                 g_critical("Unknown device option '%s'.", (char *) key);
 357                 return -1;
 358         }
 359         src->key = srci->key;
 360
 361         if ((value == NULL) &&
 362                 (srci->datatype != SR_T_BOOL)) {
 363                 g_critical("Option '%s' needs a value.", (char *)key);
 364                 return -1;
 365         }
 366
 367         ret = 0;
 368         switch (srci->datatype) {
 369         case SR_T_UINT64:
 370                 ret = sr_parse_sizestring(value, &tmp_u64);
 371                 if (ret != 0)
 372                         break;
 373                 src->data = g_variant_new_uint64(tmp_u64);
 374                 break;
 375         case SR_T_INT32:
 376                 ret = sr_parse_sizestring(value, &tmp_u64);
 377                 if (ret != 0)
 378                         break;
 379                 src->data = g_variant_new_int32(tmp_u64);
 380                 break;
 381         case SR_T_STRING:
 382                 src->data = g_variant_new_string(value);
 383                 break;
 384         case SR_T_BOOL:
 385                 if (!value)
 386                         tmp_bool = TRUE;
 387                 else
 388                         tmp_bool = sr_parse_boolstring(value);
 389                 src->data = g_variant_new_boolean(tmp_bool);
 390                 break;
 391         case SR_T_FLOAT:
 392                 tmp_double = strtof(value, NULL);
 393                 src->data = g_variant_new_double(tmp_double);
 394                 break;
 395         case SR_T_RATIONAL_PERIOD:
 396                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 397                         break;
 398                 rational[0] = g_variant_new_uint64(p);
 399                 rational[1] = g_variant_new_uint64(q);
 400                 src->data = g_variant_new_tuple(rational, 2);
 401                 break;
 402         case SR_T_RATIONAL_VOLT:
 403                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 404                         break;
 405                 rational[0] = g_variant_new_uint64(p);
 406                 rational[1] = g_variant_new_uint64(q);
 407                 src->data = g_variant_new_tuple(rational, 2);
 408                 break;
 409         case SR_T_UINT64_RANGE:
 410                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 411                         ret = -1;
 412                         break;
 413                 } else {
 414                         range[0] = g_variant_new_uint64(low);
 415                         range[1] = g_variant_new_uint64(high);
 416                         src->data = g_variant_new_tuple(range, 2);
 417                 }
 418                 break;
 419         case SR_T_DOUBLE_RANGE:
 420                 if (sscanf(value, "%lf-%lf", &dlow, &dhigh) != 2) {
 421                         ret = -1;
 422                         break;
 423                 } else {
 424                         range[0] = g_variant_new_double(dlow);
 425                         range[1] = g_variant_new_double(dhigh);
 426                         src->data = g_variant_new_tuple(range, 2);
 427                 }
 428                 break;
 429         default:
 430                 ret = -1;
 431         }
 432
 433         return ret;
 434 }
 435
 436 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 437 {
 438         struct sr_config src;
 439         struct sr_channel_group *cg;
 440         GHashTableIter iter;
 441         gpointer key, value;
 442         int ret;
 443
 444         g_hash_table_iter_init(&iter, args);
 445         while (g_hash_table_iter_next(&iter, &key, &value)) {
 446                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 447                         return ret;
 448                 cg = select_channel_group(sdi);
 449                 ret = sr_config_set(sdi, cg, src.key, src.data);
 450                 if (ret != SR_OK) {
 451                         g_critical("Failed to set device option '%s'.", (char *)key);
 452                         return ret;
 453                 }
 454         }
 455
 456         return SR_OK;
 457 }
 458
 459 void run_session(void)
 460 {
 461         GSList *devices, *real_devices, *sd;
 462         GHashTable *devargs;
 463         GVariant *gvar;
 464         struct sr_session *session;
 465         struct sr_trigger *trigger;
 466         struct sr_dev_inst *sdi;
 467         uint64_t min_samples, max_samples;
 468         gsize n_elements, i;
 469         const uint32_t *dev_opts;
 470         int is_demo_dev;
 471
 472         devices = device_scan();
 473         if (!devices) {
 474                 g_critical("No devices found.");
 475                 return;
 476         }
 477
 478         real_devices = NULL;
 479         for (sd = devices; sd; sd = sd->next) {
 480                 sdi = sd->data;
 481
 482                 if (sr_config_list(sdi->driver, sdi, NULL, SR_CONF_DEVICE_OPTIONS, &gvar) != SR_OK) {
 483                         g_critical("Failed to query sr_config_list(SR_CONF_DEVICE_OPTIONS).");
 484                         return;
 485                 }
 486
 487                 dev_opts = g_variant_get_fixed_array(gvar, &n_elements, sizeof(uint32_t));
 488
 489                 is_demo_dev = 0;
 490                 for (i = 0; i < n_elements; i++) {
 491                         if (dev_opts[i] == SR_CONF_DEMO_DEV)
 492                                 is_demo_dev = 1;
 493                 }
 494
 495                 g_variant_unref(gvar);
 496
 497                 if (!is_demo_dev)
 498                         real_devices = g_slist_append(real_devices, sdi);
 499         }
 500
 501         if (g_slist_length(devices) > 1) {
 502                 if (g_slist_length(real_devices) != 1) {
 503                         g_critical("sigrok-cli only supports one device for capturing.");
 504                         return;
 505                 } else {
 506                         /* We only have one non-demo device. */
 507                         g_slist_free(devices);
 508                         devices = real_devices;
 509                         real_devices = NULL;
 510                 }
 511         }
 512
 513         sdi = devices->data;
 514         g_slist_free(devices);
 515         g_slist_free(real_devices);
 516
 517         sr_session_new(&session);
 518         sr_session_datafeed_callback_add(session, datafeed_in, NULL);
 519
 520         if (sr_dev_open(sdi) != SR_OK) {
 521                 g_critical("Failed to open device.");
 522                 return;
 523         }
 524
 525         if (sr_session_dev_add(session, sdi) != SR_OK) {
 526                 g_critical("Failed to add device to session.");
 527                 sr_session_destroy(session);
 528                 return;
 529         }
 530
 531         if (opt_config) {
 532                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 533                         if (set_dev_options(sdi, devargs) != SR_OK)
 534                                 return;
 535                         g_hash_table_destroy(devargs);
 536                 }
 537         }
 538
 539         if (select_channels(sdi) != SR_OK) {
 540                 g_critical("Failed to set channels.");
 541                 sr_session_destroy(session);
 542                 return;
 543         }
 544
 545         if (opt_triggers) {
 546                 if (!parse_triggerstring(sdi, opt_triggers, &trigger)) {
 547                         sr_session_destroy(session);
 548                         return;
 549                 }
 550                 if (sr_session_trigger_set(session, trigger) != SR_OK) {
 551                         sr_session_destroy(session);
 552                         return;
 553                 }
 554         }
 555
 556         if (opt_continuous) {
 557                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 558                         g_critical("This device does not support continuous sampling.");
 559                         sr_session_destroy(session);
 560                         return;
 561                 }
 562         }
 563
 564         if (opt_time) {
 565                 if (set_limit_time(sdi) != SR_OK) {
 566                         sr_session_destroy(session);
 567                         return;
 568                 }
 569         }
 570
 571         if (opt_samples) {
 572                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 573                         g_critical("Invalid sample limit '%s'.", opt_samples);
 574                         sr_session_destroy(session);
 575                         return;
 576                 }
 577                 if (sr_config_list(sdi->driver, sdi, NULL,
 578                                 SR_CONF_LIMIT_SAMPLES, &gvar) == SR_OK) {
 579                         /* The device has no compression, or compression is turned
 580                          * off, and publishes its sample memory size. */
 581                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 582                         g_variant_unref(gvar);
 583                         if (limit_samples < min_samples) {
 584                                 g_critical("The device stores at least %"PRIu64
 585                                                 " samples with the current settings.", min_samples);
 586                         }
 587                         if (limit_samples > max_samples) {
 588                                 g_critical("The device can store only %"PRIu64
 589                                                 " samples with the current settings.", max_samples);
 590                         }
 591                 }
 592                 gvar = g_variant_new_uint64(limit_samples);
 593                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 594                         g_critical("Failed to configure sample limit.");
 595                         sr_session_destroy(session);
 596                         return;
 597                 }
 598         }
 599
 600         if (opt_frames) {
 601                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 602                         g_critical("Invalid sample limit '%s'.", opt_samples);
 603                         sr_session_destroy(session);
 604                         return;
 605                 }
 606                 gvar = g_variant_new_uint64(limit_frames);
 607                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 608                         g_critical("Failed to configure frame limit.");
 609                         sr_session_destroy(session);
 610                         return;
 611                 }
 612         }
 613
 614         if (sr_session_start(session) != SR_OK) {
 615                 g_critical("Failed to start session.");
 616                 sr_session_destroy(session);
 617                 return;
 618         }
 619
 620         if (opt_continuous)
 621                 add_anykey(session);
 622
 623         sr_session_run(session);
 624
 625         if (opt_continuous)
 626                 clear_anykey();
 627
 628         sr_session_datafeed_callback_remove_all(session);
 629         sr_session_destroy(session);
 630
 631 }
 632
 633 void save_chunk_logic(struct sr_session *session, uint8_t *data,
 634                 uint64_t data_len, int unitsize)
 635 {
 636         static uint8_t *buf = NULL;
 637         static int buf_len = 0;
 638         static int last_unitsize = 0;
 639         int max;
 640
 641         if (!buf)
 642                 buf = g_malloc(SAVE_CHUNK_SIZE);
 643
 644         while (data_len > SAVE_CHUNK_SIZE) {
 645                 save_chunk_logic(session, data, SAVE_CHUNK_SIZE, unitsize);
 646                 data += SAVE_CHUNK_SIZE;
 647                 data_len -= SAVE_CHUNK_SIZE;
 648         }
 649
 650         if (buf_len + data_len > SAVE_CHUNK_SIZE) {
 651                 max = (SAVE_CHUNK_SIZE - buf_len) / unitsize * unitsize;
 652                 memcpy(buf + buf_len, data, max);
 653                 sr_session_append(session, opt_output_file, buf, unitsize,
 654                                 (buf_len + max) / unitsize);
 655                 memcpy(buf, data + max, data_len - max);
 656                 buf_len = data_len - max;
 657         } else if (data_len == 0 && last_unitsize != 0) {
 658                 /* End of data, flush the buffer out. */
 659                 sr_session_append(session, opt_output_file, buf, last_unitsize,
 660                                 buf_len / last_unitsize);
 661         } else {
 662                 /* Buffer chunk. */
 663                 memcpy(buf + buf_len, data, data_len);
 664                 buf_len += data_len;
 665         }
 666         last_unitsize = unitsize;
 667
 668 }