src/session_driver.c

   1 /*
   2  * This file is part of the libsigrok 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 <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <sys/time.h>
  26 #include <zip.h>
  27 #include <libsigrok/libsigrok.h>
  28 #include "libsigrok-internal.h"
  29
  30 #define LOG_PREFIX "virtual-session"
  31
  32 /* size of payloads sent across the session bus */
  33 /** @cond PRIVATE */
  34 #define CHUNKSIZE (4 * 1024 * 1024)
  35 /** @endcond */
  36
  37 SR_PRIV struct sr_dev_driver session_driver_info;
  38
  39 struct session_vdev {
  40         char *sessionfile;
  41         char *capturefile;
  42         struct zip *archive;
  43         struct zip_file *capfile;
  44         int bytes_read;
  45         uint64_t samplerate;
  46         int unitsize;
  47         int num_logic_channels;
  48         int num_analog_channels;
  49         int cur_analog_channel;
  50         GArray *analog_channels;
  51         int cur_chunk;
  52         gboolean finished;
  53 };
  54
  55 static const uint32_t devopts[] = {
  56         SR_CONF_CAPTUREFILE | SR_CONF_SET,
  57         SR_CONF_CAPTURE_UNITSIZE | SR_CONF_GET | SR_CONF_SET,
  58         SR_CONF_NUM_LOGIC_CHANNELS | SR_CONF_SET,
  59         SR_CONF_NUM_ANALOG_CHANNELS | SR_CONF_SET,
  60         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET,
  61         SR_CONF_SESSIONFILE | SR_CONF_SET,
  62 };
  63
  64 static gboolean stream_session_data(struct sr_dev_inst *sdi)
  65 {
  66         struct session_vdev *vdev;
  67         struct sr_datafeed_packet packet;
  68         struct sr_datafeed_logic logic;
  69         struct sr_datafeed_analog analog;
  70         struct sr_analog_encoding encoding;
  71         struct sr_analog_meaning meaning;
  72         struct sr_analog_spec spec;
  73         struct zip_stat zs;
  74         int ret, got_data;
  75         char capturefile[16];
  76         void *buf;
  77
  78         got_data = FALSE;
  79         vdev = sdi->priv;
  80
  81         if (!vdev->capfile) {
  82                 /* No capture file opened yet, or finished with the last
  83                  * chunked one. */
  84                 if (vdev->capturefile && (vdev->cur_chunk == 0)) {
  85                         /* capturefile is always the unchunked base name. */
  86                         if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) {
  87                                 /* No chunks, just a single capture file. */
  88                                 vdev->cur_chunk = 0;
  89                                 if (!(vdev->capfile = zip_fopen(vdev->archive,
  90                                                 vdev->capturefile, 0)))
  91                                         return FALSE;
  92                                 sr_dbg("Opened %s.", vdev->capturefile);
  93                         } else {
  94                                 /* Try as first chunk filename. */
  95                                 snprintf(capturefile, 15, "%s-1", vdev->capturefile);
  96                                 if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
  97                                         vdev->cur_chunk = 1;
  98                                         if (!(vdev->capfile = zip_fopen(vdev->archive,
  99                                                         capturefile, 0)))
 100                                                 return FALSE;
 101                                         sr_dbg("Opened %s.", capturefile);
 102                                 } else {
 103                                         sr_err("No capture file '%s' in " "session file '%s'.",
 104                                                         vdev->capturefile, vdev->sessionfile);
 105                                         return FALSE;
 106                                 }
 107                         }
 108                 } else {
 109                         /* Capture data is chunked, advance to the next chunk. */
 110                         vdev->cur_chunk++;
 111                         snprintf(capturefile, 15, "%s-%d", vdev->capturefile,
 112                                         vdev->cur_chunk);
 113                         if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
 114                                 if (!(vdev->capfile = zip_fopen(vdev->archive,
 115                                                 capturefile, 0)))
 116                                         return FALSE;
 117                                 sr_dbg("Opened %s.", capturefile);
 118                         } else if (vdev->cur_analog_channel < vdev->num_analog_channels) {
 119                                 vdev->capturefile = g_strdup_printf("analog-1-%d",
 120                                                 vdev->num_logic_channels + vdev->cur_analog_channel + 1);
 121                                 vdev->cur_analog_channel++;
 122                                 vdev->cur_chunk = 0;
 123                                 return TRUE;
 124                         } else {
 125                                 /* We got all the chunks, finish up. */
 126                                 g_free(vdev->capturefile);
 127
 128                                 /* If the file has logic channels, the initial value for
 129                                  * capturefile is set by stream_session_data() - however only
 130                                  * once. In order to not mess this mechanism up, we simulate
 131                                  * this here if needed. For purely analog files, capturefile
 132                                  * is not set.
 133                                  */
 134                                 if (vdev->num_logic_channels)
 135                                         vdev->capturefile = g_strdup("logic-1");
 136                                 else
 137                                         vdev->capturefile = NULL;
 138                                 return FALSE;
 139                         }
 140                 }
 141         }
 142
 143         buf = g_malloc(CHUNKSIZE);
 144
 145         /* unitsize is not defined for purely analog session files. */
 146         if (vdev->unitsize)
 147                 ret = zip_fread(vdev->capfile, buf,
 148                                 CHUNKSIZE / vdev->unitsize * vdev->unitsize);
 149         else
 150                 ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
 151
 152         if (ret > 0) {
 153                 got_data = TRUE;
 154                 if (vdev->cur_analog_channel != 0) {
 155                         packet.type = SR_DF_ANALOG;
 156                         packet.payload = &analog;
 157                         /* TODO: Use proper 'digits' value for this device (and its modes). */
 158                         sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
 159                         analog.meaning->channels = g_slist_prepend(NULL,
 160                                         g_array_index(vdev->analog_channels,
 161                                                 struct sr_channel *, vdev->cur_analog_channel - 1));
 162                         analog.num_samples = ret / sizeof(float);
 163                         analog.meaning->mq = SR_MQ_VOLTAGE;
 164                         analog.meaning->unit = SR_UNIT_VOLT;
 165                         analog.meaning->mqflags = SR_MQFLAG_DC;
 166                         analog.data = (float *) buf;
 167                 } else {
 168                         if (ret % vdev->unitsize != 0)
 169                                 sr_warn("Read size %d not a multiple of the"
 170                                         " unit size %d.", ret, vdev->unitsize);
 171                         packet.type = SR_DF_LOGIC;
 172                         packet.payload = &logic;
 173                         logic.length = ret;
 174                         logic.unitsize = vdev->unitsize;
 175                         logic.data = buf;
 176                 }
 177                 vdev->bytes_read += ret;
 178                 sr_session_send(sdi, &packet);
 179         } else {
 180                 /* done with this capture file */
 181                 zip_fclose(vdev->capfile);
 182                 vdev->capfile = NULL;
 183                 if (vdev->cur_chunk != 0) {
 184                         /* There might be more chunks, so don't fall through
 185                          * to the SR_DF_END here. */
 186                         got_data = TRUE;
 187                 }
 188         }
 189         g_free(buf);
 190
 191         return got_data;
 192 }
 193
 194 static int receive_data(int fd, int revents, void *cb_data)
 195 {
 196         struct sr_dev_inst *sdi;
 197         struct session_vdev *vdev;
 198
 199         (void)fd;
 200         (void)revents;
 201
 202         sdi = cb_data;
 203         vdev = sdi->priv;
 204
 205         if (!vdev->finished && !stream_session_data(sdi))
 206                 vdev->finished = TRUE;
 207         if (!vdev->finished)
 208                 return G_SOURCE_CONTINUE;
 209
 210         if (vdev->capfile) {
 211                 zip_fclose(vdev->capfile);
 212                 vdev->capfile = NULL;
 213         }
 214         if (vdev->archive) {
 215                 zip_discard(vdev->archive);
 216                 vdev->archive = NULL;
 217         }
 218
 219         std_session_send_df_end(sdi);
 220
 221         return G_SOURCE_REMOVE;
 222 }
 223
 224 /* driver callbacks */
 225
 226 static int dev_open(struct sr_dev_inst *sdi)
 227 {
 228         struct sr_dev_driver *di;
 229         struct drv_context *drvc;
 230         struct session_vdev *vdev;
 231
 232         di = sdi->driver;
 233         drvc = di->context;
 234         vdev = g_malloc0(sizeof(struct session_vdev));
 235         sdi->priv = vdev;
 236         drvc->instances = g_slist_append(drvc->instances, sdi);
 237
 238         return SR_OK;
 239 }
 240
 241 static int dev_close(struct sr_dev_inst *sdi)
 242 {
 243         const struct session_vdev *const vdev = sdi->priv;
 244         g_free(vdev->sessionfile);
 245         g_free(vdev->capturefile);
 246
 247         g_free(sdi->priv);
 248         sdi->priv = NULL;
 249
 250         return SR_OK;
 251 }
 252
 253 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 254                 const struct sr_channel_group *cg)
 255 {
 256         struct session_vdev *vdev;
 257
 258         (void)cg;
 259
 260         if (!sdi)
 261                 return SR_ERR;
 262
 263         vdev = sdi->priv;
 264
 265         switch (key) {
 266         case SR_CONF_SAMPLERATE:
 267                 *data = g_variant_new_uint64(vdev->samplerate);
 268                 break;
 269         case SR_CONF_CAPTURE_UNITSIZE:
 270                 *data = g_variant_new_uint64(vdev->unitsize);
 271                 break;
 272         default:
 273                 return SR_ERR_NA;
 274         }
 275
 276         return SR_OK;
 277 }
 278
 279 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 280                 const struct sr_channel_group *cg)
 281 {
 282         struct session_vdev *vdev;
 283
 284         (void)cg;
 285
 286         vdev = sdi->priv;
 287
 288         switch (key) {
 289         case SR_CONF_SAMPLERATE:
 290                 vdev->samplerate = g_variant_get_uint64(data);
 291                 sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
 292                 break;
 293         case SR_CONF_SESSIONFILE:
 294                 g_free(vdev->sessionfile);
 295                 vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
 296                 sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
 297                 break;
 298         case SR_CONF_CAPTUREFILE:
 299                 g_free(vdev->capturefile);
 300                 vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
 301                 sr_info("Setting capturefile to '%s'.", vdev->capturefile);
 302                 break;
 303         case SR_CONF_CAPTURE_UNITSIZE:
 304                 vdev->unitsize = g_variant_get_uint64(data);
 305                 break;
 306         case SR_CONF_NUM_LOGIC_CHANNELS:
 307                 vdev->num_logic_channels = g_variant_get_int32(data);
 308                 break;
 309         case SR_CONF_NUM_ANALOG_CHANNELS:
 310                 vdev->num_analog_channels = g_variant_get_int32(data);
 311                 break;
 312         default:
 313                 return SR_ERR_NA;
 314         }
 315
 316         return SR_OK;
 317 }
 318
 319 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 320                 const struct sr_channel_group *cg)
 321 {
 322         return STD_CONFIG_LIST(key, data, sdi, cg, NULL, NULL, devopts);
 323 }
 324
 325 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 326 {
 327         struct session_vdev *vdev;
 328         int ret;
 329         GSList *l;
 330         struct sr_channel *ch;
 331
 332         vdev = sdi->priv;
 333         vdev->bytes_read = 0;
 334         vdev->cur_analog_channel = 0;
 335         vdev->analog_channels = g_array_sized_new(FALSE, FALSE,
 336                         sizeof(struct sr_channel *), vdev->num_analog_channels);
 337         for (l = sdi->channels; l; l = l->next) {
 338                 ch = l->data;
 339                 if (ch->type == SR_CHANNEL_ANALOG)
 340                         g_array_append_val(vdev->analog_channels, ch);
 341         }
 342         vdev->cur_chunk = 0;
 343         vdev->finished = FALSE;
 344
 345         sr_info("Opening archive %s file %s", vdev->sessionfile,
 346                 vdev->capturefile);
 347
 348         if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
 349                 sr_err("Failed to open session file '%s': "
 350                        "zip error %d.", vdev->sessionfile, ret);
 351                 return SR_ERR;
 352         }
 353
 354         std_session_send_df_header(sdi);
 355
 356         /* freewheeling source */
 357         sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi);
 358
 359         return SR_OK;
 360 }
 361
 362 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 363 {
 364         struct session_vdev *vdev;
 365
 366         vdev = sdi->priv;
 367
 368         vdev->finished = TRUE;
 369
 370         return SR_OK;
 371 }
 372
 373 /** @private */
 374 SR_PRIV struct sr_dev_driver session_driver = {
 375         .name = "virtual-session",
 376         .longname = "Session-emulating driver",
 377         .api_version = 1,
 378         .init = std_init,
 379         .cleanup = std_cleanup,
 380         .scan = NULL,
 381         .dev_list = NULL,
 382         .dev_clear = std_dev_clear,
 383         .config_get = config_get,
 384         .config_set = config_set,
 385         .config_list = config_list,
 386         .dev_open = dev_open,
 387         .dev_close = dev_close,
 388         .dev_acquisition_start = dev_acquisition_start,
 389         .dev_acquisition_stop = dev_acquisition_stop,
 390         .context = NULL,
 391 };