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 (512 * 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_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_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                                 return FALSE;
 127                         }
 128                 }
 129         }
 130
 131         buf = g_malloc(CHUNKSIZE);
 132
 133         /* unitsize is not defined for purely analog session files. */
 134         if (vdev->unitsize)
 135                 ret = zip_fread(vdev->capfile, buf,
 136                                 CHUNKSIZE / vdev->unitsize * vdev->unitsize);
 137         else
 138                 ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
 139
 140         if (ret > 0) {
 141                 got_data = TRUE;
 142                 if (vdev->cur_analog_channel != 0) {
 143                         packet.type = SR_DF_ANALOG;
 144                         packet.payload = &analog;
 145                         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 146                         analog.meaning->channels = g_slist_prepend(NULL,
 147                                         g_array_index(vdev->analog_channels,
 148                                                 struct sr_channel *, vdev->cur_analog_channel - 1));
 149                         analog.num_samples = ret / sizeof(float);
 150                         analog.meaning->mq = SR_MQ_VOLTAGE;
 151                         analog.meaning->unit = SR_UNIT_VOLT;
 152                         analog.meaning->mqflags = SR_MQFLAG_DC;
 153                         analog.data = (float *) buf;
 154                 } else {
 155                         if (ret % vdev->unitsize != 0)
 156                                 sr_warn("Read size %d not a multiple of the"
 157                                         " unit size %d.", ret, vdev->unitsize);
 158                         packet.type = SR_DF_LOGIC;
 159                         packet.payload = &logic;
 160                         logic.length = ret;
 161                         logic.unitsize = vdev->unitsize;
 162                         logic.data = buf;
 163                 }
 164                 vdev->bytes_read += ret;
 165                 sr_session_send(sdi, &packet);
 166         } else {
 167                 /* done with this capture file */
 168                 zip_fclose(vdev->capfile);
 169                 vdev->capfile = NULL;
 170                 if (vdev->cur_chunk != 0) {
 171                         /* There might be more chunks, so don't fall through
 172                          * to the SR_DF_END here. */
 173                         got_data = TRUE;
 174                 }
 175         }
 176         g_free(buf);
 177
 178         return got_data;
 179 }
 180
 181 static int receive_data(int fd, int revents, void *cb_data)
 182 {
 183         struct sr_dev_inst *sdi;
 184         struct session_vdev *vdev;
 185
 186         (void)fd;
 187         (void)revents;
 188
 189         sdi = cb_data;
 190         vdev = sdi->priv;
 191
 192         if (!vdev->finished && !stream_session_data(sdi))
 193                 vdev->finished = TRUE;
 194         if (!vdev->finished)
 195                 return G_SOURCE_CONTINUE;
 196
 197         if (vdev->capfile) {
 198                 zip_fclose(vdev->capfile);
 199                 vdev->capfile = NULL;
 200         }
 201         if (vdev->archive) {
 202                 zip_discard(vdev->archive);
 203                 vdev->archive = NULL;
 204         }
 205
 206         std_session_send_df_end(sdi);
 207
 208         return G_SOURCE_REMOVE;
 209 }
 210
 211 /* driver callbacks */
 212
 213 static int dev_clear(const struct sr_dev_driver *di)
 214 {
 215         struct drv_context *drvc;
 216         GSList *l;
 217
 218         drvc = di->context;
 219         for (l = drvc->instances; l; l = l->next)
 220                 sr_dev_inst_free(l->data);
 221         g_slist_free(drvc->instances);
 222         drvc->instances = NULL;
 223
 224         return SR_OK;
 225 }
 226
 227 static int dev_open(struct sr_dev_inst *sdi)
 228 {
 229         struct sr_dev_driver *di;
 230         struct drv_context *drvc;
 231         struct session_vdev *vdev;
 232
 233         di = sdi->driver;
 234         drvc = di->context;
 235         vdev = g_malloc0(sizeof(struct session_vdev));
 236         sdi->priv = vdev;
 237         drvc->instances = g_slist_append(drvc->instances, sdi);
 238
 239         return SR_OK;
 240 }
 241
 242 static int dev_close(struct sr_dev_inst *sdi)
 243 {
 244         const struct session_vdev *const vdev = sdi->priv;
 245         g_free(vdev->sessionfile);
 246         g_free(vdev->capturefile);
 247
 248         g_free(sdi->priv);
 249         sdi->priv = NULL;
 250
 251         return SR_OK;
 252 }
 253
 254 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 255                 const struct sr_channel_group *cg)
 256 {
 257         struct session_vdev *vdev;
 258
 259         (void)cg;
 260
 261         if (!sdi)
 262                 return SR_ERR;
 263
 264         vdev = sdi->priv;
 265
 266         switch (key) {
 267         case SR_CONF_SAMPLERATE:
 268                 *data = g_variant_new_uint64(vdev->samplerate);
 269                 break;
 270         case SR_CONF_CAPTURE_UNITSIZE:
 271                 *data = g_variant_new_uint64(vdev->unitsize);
 272                 break;
 273         default:
 274                 return SR_ERR_NA;
 275         }
 276
 277         return SR_OK;
 278 }
 279
 280 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 281                 const struct sr_channel_group *cg)
 282 {
 283         struct session_vdev *vdev;
 284
 285         (void)cg;
 286
 287         vdev = sdi->priv;
 288
 289         switch (key) {
 290         case SR_CONF_SAMPLERATE:
 291                 vdev->samplerate = g_variant_get_uint64(data);
 292                 sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
 293                 break;
 294         case SR_CONF_SESSIONFILE:
 295                 g_free(vdev->sessionfile);
 296                 vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
 297                 sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
 298                 break;
 299         case SR_CONF_CAPTUREFILE:
 300                 g_free(vdev->capturefile);
 301                 vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
 302                 sr_info("Setting capturefile to '%s'.", vdev->capturefile);
 303                 break;
 304         case SR_CONF_CAPTURE_UNITSIZE:
 305                 vdev->unitsize = g_variant_get_uint64(data);
 306                 break;
 307         case SR_CONF_NUM_LOGIC_CHANNELS:
 308                 vdev->num_channels = g_variant_get_int32(data);
 309                 break;
 310         case SR_CONF_NUM_ANALOG_CHANNELS:
 311                 vdev->num_analog_channels = g_variant_get_int32(data);
 312                 break;
 313         default:
 314                 return SR_ERR_NA;
 315         }
 316
 317         return SR_OK;
 318 }
 319
 320 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 321                 const struct sr_channel_group *cg)
 322 {
 323         (void)sdi;
 324         (void)cg;
 325
 326         switch (key) {
 327         case SR_CONF_DEVICE_OPTIONS:
 328                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 329                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 330                 break;
 331         default:
 332                 return SR_ERR_NA;
 333         }
 334
 335         return SR_OK;
 336 }
 337
 338 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 339 {
 340         struct session_vdev *vdev;
 341         int ret;
 342         GSList *l;
 343         struct sr_channel *ch;
 344
 345         vdev = sdi->priv;
 346         vdev->bytes_read = 0;
 347         vdev->cur_analog_channel = 0;
 348         vdev->analog_channels = g_array_sized_new(FALSE, FALSE,
 349                         sizeof(struct sr_channel *), vdev->num_analog_channels);
 350         for (l = sdi->channels; l; l = l->next) {
 351                 ch = l->data;
 352                 if (ch->type == SR_CHANNEL_ANALOG)
 353                         g_array_append_val(vdev->analog_channels, ch);
 354         }
 355         vdev->cur_chunk = 0;
 356         vdev->finished = FALSE;
 357
 358         sr_info("Opening archive %s file %s", vdev->sessionfile,
 359                 vdev->capturefile);
 360
 361         if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
 362                 sr_err("Failed to open session file '%s': "
 363                        "zip error %d.", vdev->sessionfile, ret);
 364                 return SR_ERR;
 365         }
 366
 367         std_session_send_df_header(sdi);
 368
 369         /* freewheeling source */
 370         sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi);
 371
 372         return SR_OK;
 373 }
 374
 375 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 376 {
 377         struct session_vdev *vdev;
 378
 379         vdev = sdi->priv;
 380
 381         vdev->finished = TRUE;
 382
 383         return SR_OK;
 384 }
 385
 386 /** @private */
 387 SR_PRIV struct sr_dev_driver session_driver = {
 388         .name = "virtual-session",
 389         .longname = "Session-emulating driver",
 390         .api_version = 1,
 391         .init = std_init,
 392         .cleanup = dev_clear,
 393         .scan = NULL,
 394         .dev_list = NULL,
 395         .dev_clear = dev_clear,
 396         .config_get = config_get,
 397         .config_set = config_set,
 398         .config_list = config_list,
 399         .dev_open = dev_open,
 400         .dev_close = dev_close,
 401         .dev_acquisition_start = dev_acquisition_start,
 402         .dev_acquisition_stop = dev_acquisition_stop,
 403         .context = NULL,
 404 };