plugins/elements/gstidentity.c

   1 /* GStreamer
   2  * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
   3  *                    2000 Wim Taymans <wtay@chello.be>
   4  *                    2005 Wim Taymans <wim@fluendo.com>
   5  *
   6  * gstidentity.c:
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  */
  23 /**
  24  * SECTION:element-identity
  25  *
  26  * Dummy element that passes incoming data through unmodified. It has some
  27  * useful diagnostic functions, such as offset and timestamp checking.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 #  include "config.h"
  32 #endif
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "../../gst/gst-i18n-lib.h"
  38 #include "gstidentity.h"
  39
  40 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
  41     GST_PAD_SINK,
  42     GST_PAD_ALWAYS,
  43     GST_STATIC_CAPS_ANY);
  44
  45 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
  46     GST_PAD_SRC,
  47     GST_PAD_ALWAYS,
  48     GST_STATIC_CAPS_ANY);
  49
  50 GST_DEBUG_CATEGORY_STATIC (gst_identity_debug);
  51 #define GST_CAT_DEFAULT gst_identity_debug
  52
  53 /* Identity signals and args */
  54 enum
  55 {
  56   SIGNAL_HANDOFF,
  57   /* FILL ME */
  58   LAST_SIGNAL
  59 };
  60
  61 #define DEFAULT_SLEEP_TIME              0
  62 #define DEFAULT_DUPLICATE               1
  63 #define DEFAULT_ERROR_AFTER             -1
  64 #define DEFAULT_DROP_PROBABILITY        0.0
  65 #define DEFAULT_DATARATE                0
  66 #define DEFAULT_SILENT                  TRUE
  67 #define DEFAULT_SINGLE_SEGMENT          FALSE
  68 #define DEFAULT_DUMP                    FALSE
  69 #define DEFAULT_SYNC                    FALSE
  70 #define DEFAULT_CHECK_IMPERFECT_TIMESTAMP FALSE
  71 #define DEFAULT_CHECK_IMPERFECT_OFFSET    FALSE
  72 #define DEFAULT_SIGNAL_HANDOFFS           TRUE
  73
  74 enum
  75 {
  76   PROP_0,
  77   PROP_SLEEP_TIME,
  78   PROP_ERROR_AFTER,
  79   PROP_DROP_PROBABILITY,
  80   PROP_DATARATE,
  81   PROP_SILENT,
  82   PROP_SINGLE_SEGMENT,
  83   PROP_LAST_MESSAGE,
  84   PROP_DUMP,
  85   PROP_SYNC,
  86   PROP_CHECK_IMPERFECT_TIMESTAMP,
  87   PROP_CHECK_IMPERFECT_OFFSET,
  88   PROP_SIGNAL_HANDOFFS
  89 };
  90
  91
  92 #define _do_init \
  93     GST_DEBUG_CATEGORY_INIT (gst_identity_debug, "identity", 0, "identity element");
  94 #define gst_identity_parent_class parent_class
  95 G_DEFINE_TYPE_WITH_CODE (GstIdentity, gst_identity, GST_TYPE_BASE_TRANSFORM,
  96     _do_init);
  97
  98 static void gst_identity_finalize (GObject * object);
  99 static void gst_identity_set_property (GObject * object, guint prop_id,
 100     const GValue * value, GParamSpec * pspec);
 101 static void gst_identity_get_property (GObject * object, guint prop_id,
 102     GValue * value, GParamSpec * pspec);
 103
 104 static gboolean gst_identity_sink_event (GstBaseTransform * trans,
 105     GstEvent * event);
 106 static GstFlowReturn gst_identity_transform_ip (GstBaseTransform * trans,
 107     GstBuffer * buf);
 108 static gboolean gst_identity_start (GstBaseTransform * trans);
 109 static gboolean gst_identity_stop (GstBaseTransform * trans);
 110 static GstStateChangeReturn gst_identity_change_state (GstElement * element,
 111     GstStateChange transition);
 112
 113 static guint gst_identity_signals[LAST_SIGNAL] = { 0 };
 114
 115 static GParamSpec *pspec_last_message = NULL;
 116
 117 static void
 118 gst_identity_finalize (GObject * object)
 119 {
 120   GstIdentity *identity;
 121
 122   identity = GST_IDENTITY (object);
 123
 124   g_free (identity->last_message);
 125
 126   G_OBJECT_CLASS (parent_class)->finalize (object);
 127 }
 128
 129 static void
 130 gst_identity_class_init (GstIdentityClass * klass)
 131 {
 132   GObjectClass *gobject_class;
 133   GstElementClass *gstelement_class;
 134   GstBaseTransformClass *gstbasetrans_class;
 135
 136   gobject_class = G_OBJECT_CLASS (klass);
 137   gstelement_class = GST_ELEMENT_CLASS (klass);
 138   gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
 139
 140   gobject_class->set_property = gst_identity_set_property;
 141   gobject_class->get_property = gst_identity_get_property;
 142
 143   g_object_class_install_property (gobject_class, PROP_SLEEP_TIME,
 144       g_param_spec_uint ("sleep-time", "Sleep time",
 145           "Microseconds to sleep between processing", 0, G_MAXUINT,
 146           DEFAULT_SLEEP_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 147   g_object_class_install_property (gobject_class, PROP_ERROR_AFTER,
 148       g_param_spec_int ("error-after", "Error After", "Error after N buffers",
 149           G_MININT, G_MAXINT, DEFAULT_ERROR_AFTER,
 150           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 151   g_object_class_install_property (gobject_class, PROP_DROP_PROBABILITY,
 152       g_param_spec_float ("drop-probability", "Drop Probability",
 153           "The Probability a buffer is dropped", 0.0, 1.0,
 154           DEFAULT_DROP_PROBABILITY,
 155           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 156   g_object_class_install_property (gobject_class, PROP_DATARATE,
 157       g_param_spec_int ("datarate", "Datarate",
 158           "(Re)timestamps buffers with number of bytes per second (0 = inactive)",
 159           0, G_MAXINT, DEFAULT_DATARATE,
 160           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 161   g_object_class_install_property (gobject_class, PROP_SILENT,
 162       g_param_spec_boolean ("silent", "silent", "silent", DEFAULT_SILENT,
 163           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 164   g_object_class_install_property (gobject_class, PROP_SINGLE_SEGMENT,
 165       g_param_spec_boolean ("single-segment", "Single Segment",
 166           "Timestamp buffers and eat segments so as to appear as one segment",
 167           DEFAULT_SINGLE_SEGMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 168   pspec_last_message = g_param_spec_string ("last-message", "last-message",
 169       "last-message", NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 170   g_object_class_install_property (gobject_class, PROP_LAST_MESSAGE,
 171       pspec_last_message);
 172   g_object_class_install_property (gobject_class, PROP_DUMP,
 173       g_param_spec_boolean ("dump", "Dump", "Dump buffer contents to stdout",
 174           DEFAULT_DUMP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 175   g_object_class_install_property (gobject_class, PROP_SYNC,
 176       g_param_spec_boolean ("sync", "Synchronize",
 177           "Synchronize to pipeline clock", DEFAULT_SYNC,
 178           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 179   g_object_class_install_property (gobject_class,
 180       PROP_CHECK_IMPERFECT_TIMESTAMP,
 181       g_param_spec_boolean ("check-imperfect-timestamp",
 182           "Check for discontiguous timestamps",
 183           "Send element messages if timestamps and durations do not match up",
 184           DEFAULT_CHECK_IMPERFECT_TIMESTAMP,
 185           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 186   g_object_class_install_property (gobject_class, PROP_CHECK_IMPERFECT_OFFSET,
 187       g_param_spec_boolean ("check-imperfect-offset",
 188           "Check for discontiguous offset",
 189           "Send element messages if offset and offset_end do not match up",
 190           DEFAULT_CHECK_IMPERFECT_OFFSET,
 191           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 192
 193   /**
 194    * GstIdentity:signal-handoffs
 195    *
 196    * If set to #TRUE, the identity will emit a handoff signal when handling a buffer.
 197    * When set to #FALSE, no signal will be emited, which might improve performance.
 198    *
 199    * Since: 0.10.16
 200    */
 201   g_object_class_install_property (gobject_class, PROP_SIGNAL_HANDOFFS,
 202       g_param_spec_boolean ("signal-handoffs",
 203           "Signal handoffs", "Send a signal before pushing the buffer",
 204           DEFAULT_SIGNAL_HANDOFFS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 205
 206   /**
 207    * GstIdentity::handoff:
 208    * @identity: the identity instance
 209    * @buffer: the buffer that just has been received
 210    * @pad: the pad that received it
 211    *
 212    * This signal gets emitted before passing the buffer downstream.
 213    */
 214   gst_identity_signals[SIGNAL_HANDOFF] =
 215       g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
 216       G_STRUCT_OFFSET (GstIdentityClass, handoff), NULL, NULL,
 217       g_cclosure_marshal_generic, G_TYPE_NONE, 1,
 218       GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE);
 219
 220   gobject_class->finalize = gst_identity_finalize;
 221
 222   gst_element_class_set_static_metadata (gstelement_class,
 223       "Identity",
 224       "Generic",
 225       "Pass data without modification", "Erik Walthinsen <omega@cse.ogi.edu>");
 226   gst_element_class_add_pad_template (gstelement_class,
 227       gst_static_pad_template_get (&srctemplate));
 228   gst_element_class_add_pad_template (gstelement_class,
 229       gst_static_pad_template_get (&sinktemplate));
 230
 231   gstelement_class->change_state =
 232       GST_DEBUG_FUNCPTR (gst_identity_change_state);
 233
 234   gstbasetrans_class->sink_event = GST_DEBUG_FUNCPTR (gst_identity_sink_event);
 235   gstbasetrans_class->transform_ip =
 236       GST_DEBUG_FUNCPTR (gst_identity_transform_ip);
 237   gstbasetrans_class->start = GST_DEBUG_FUNCPTR (gst_identity_start);
 238   gstbasetrans_class->stop = GST_DEBUG_FUNCPTR (gst_identity_stop);
 239 }
 240
 241 static void
 242 gst_identity_init (GstIdentity * identity)
 243 {
 244   identity->sleep_time = DEFAULT_SLEEP_TIME;
 245   identity->error_after = DEFAULT_ERROR_AFTER;
 246   identity->drop_probability = DEFAULT_DROP_PROBABILITY;
 247   identity->datarate = DEFAULT_DATARATE;
 248   identity->silent = DEFAULT_SILENT;
 249   identity->single_segment = DEFAULT_SINGLE_SEGMENT;
 250   identity->sync = DEFAULT_SYNC;
 251   identity->check_imperfect_timestamp = DEFAULT_CHECK_IMPERFECT_TIMESTAMP;
 252   identity->check_imperfect_offset = DEFAULT_CHECK_IMPERFECT_OFFSET;
 253   identity->dump = DEFAULT_DUMP;
 254   identity->last_message = NULL;
 255   identity->signal_handoffs = DEFAULT_SIGNAL_HANDOFFS;
 256
 257   gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM_CAST (identity), TRUE);
 258 }
 259
 260 static void
 261 gst_identity_notify_last_message (GstIdentity * identity)
 262 {
 263   g_object_notify_by_pspec ((GObject *) identity, pspec_last_message);
 264 }
 265
 266 static gboolean
 267 gst_identity_sink_event (GstBaseTransform * trans, GstEvent * event)
 268 {
 269   GstIdentity *identity;
 270   gboolean ret = TRUE;
 271
 272   identity = GST_IDENTITY (trans);
 273
 274   if (!identity->silent) {
 275     const GstStructure *s;
 276     const gchar *tstr;
 277     gchar *sstr;
 278
 279     GST_OBJECT_LOCK (identity);
 280     g_free (identity->last_message);
 281
 282     tstr = gst_event_type_get_name (GST_EVENT_TYPE (event));
 283     if ((s = gst_event_get_structure (event)))
 284       sstr = gst_structure_to_string (s);
 285     else
 286       sstr = g_strdup ("");
 287
 288     identity->last_message =
 289         g_strdup_printf ("event   ******* (%s:%s) E (type: %s (%d), %s) %p",
 290         GST_DEBUG_PAD_NAME (trans->sinkpad), tstr, GST_EVENT_TYPE (event),
 291         sstr, event);
 292     g_free (sstr);
 293     GST_OBJECT_UNLOCK (identity);
 294
 295     gst_identity_notify_last_message (identity);
 296   }
 297
 298   if (identity->single_segment && (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
 299     if (trans->have_segment == FALSE) {
 300       GstEvent *news;
 301       GstSegment segment;
 302
 303       gst_event_copy_segment (event, &segment);
 304       gst_event_copy_segment (event, &trans->segment);
 305       trans->have_segment = TRUE;
 306
 307       /* This is the first segment, send out a (0, -1) segment */
 308       gst_segment_init (&segment, segment.format);
 309       news = gst_event_new_segment (&segment);
 310
 311       gst_pad_event_default (trans->sinkpad, GST_OBJECT_CAST (trans), news);
 312     }
 313   }
 314
 315   /* Reset previous timestamp, duration and offsets on NEWSEGMENT
 316    * to prevent false warnings when checking for perfect streams */
 317   if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
 318     identity->prev_timestamp = identity->prev_duration = GST_CLOCK_TIME_NONE;
 319     identity->prev_offset = identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
 320   }
 321
 322   if (identity->single_segment && GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
 323     /* eat up segments */
 324     gst_event_unref (event);
 325     ret = TRUE;
 326   } else {
 327     if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_START) {
 328       GST_OBJECT_LOCK (identity);
 329       if (identity->clock_id) {
 330         GST_DEBUG_OBJECT (identity, "unlock clock wait");
 331         gst_clock_id_unschedule (identity->clock_id);
 332         gst_clock_id_unref (identity->clock_id);
 333         identity->clock_id = NULL;
 334       }
 335       GST_OBJECT_UNLOCK (identity);
 336     }
 337
 338     ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
 339   }
 340
 341   return ret;
 342 }
 343
 344 static void
 345 gst_identity_check_imperfect_timestamp (GstIdentity * identity, GstBuffer * buf)
 346 {
 347   GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);
 348
 349   /* invalid timestamp drops us out of check.  FIXME: maybe warn ? */
 350   if (timestamp != GST_CLOCK_TIME_NONE) {
 351     /* check if we had a previous buffer to compare to */
 352     if (identity->prev_timestamp != GST_CLOCK_TIME_NONE &&
 353         identity->prev_duration != GST_CLOCK_TIME_NONE) {
 354       GstClockTime t_expected;
 355       GstClockTimeDiff dt;
 356
 357       t_expected = identity->prev_timestamp + identity->prev_duration;
 358       dt = GST_CLOCK_DIFF (t_expected, timestamp);
 359       if (dt != 0) {
 360         /*
 361          * "imperfect-timestamp" bus message:
 362          * @identity:        the identity instance
 363          * @prev-timestamp:  the previous buffer timestamp
 364          * @prev-duration:   the previous buffer duration
 365          * @prev-offset:     the previous buffer offset
 366          * @prev-offset-end: the previous buffer offset end
 367          * @cur-timestamp:   the current buffer timestamp
 368          * @cur-duration:    the current buffer duration
 369          * @cur-offset:      the current buffer offset
 370          * @cur-offset-end:  the current buffer offset end
 371          *
 372          * This bus message gets emitted if the check-imperfect-timestamp
 373          * property is set and there is a gap in time between the
 374          * last buffer and the newly received buffer.
 375          */
 376         gst_element_post_message (GST_ELEMENT (identity),
 377             gst_message_new_element (GST_OBJECT (identity),
 378                 gst_structure_new ("imperfect-timestamp",
 379                     "prev-timestamp", G_TYPE_UINT64,
 380                     identity->prev_timestamp, "prev-duration", G_TYPE_UINT64,
 381                     identity->prev_duration, "prev-offset", G_TYPE_UINT64,
 382                     identity->prev_offset, "prev-offset-end", G_TYPE_UINT64,
 383                     identity->prev_offset_end, "cur-timestamp", G_TYPE_UINT64,
 384                     timestamp, "cur-duration", G_TYPE_UINT64,
 385                     GST_BUFFER_DURATION (buf), "cur-offset", G_TYPE_UINT64,
 386                     GST_BUFFER_OFFSET (buf), "cur-offset-end", G_TYPE_UINT64,
 387                     GST_BUFFER_OFFSET_END (buf), NULL)));
 388       }
 389     } else {
 390       GST_DEBUG_OBJECT (identity, "can't check data-contiguity, no "
 391           "offset_end was set on previous buffer");
 392     }
 393   }
 394 }
 395
 396 static void
 397 gst_identity_check_imperfect_offset (GstIdentity * identity, GstBuffer * buf)
 398 {
 399   guint64 offset;
 400
 401   offset = GST_BUFFER_OFFSET (buf);
 402
 403   if (identity->prev_offset_end != offset &&
 404       identity->prev_offset_end != GST_BUFFER_OFFSET_NONE &&
 405       offset != GST_BUFFER_OFFSET_NONE) {
 406     /*
 407      * "imperfect-offset" bus message:
 408      * @identity:        the identity instance
 409      * @prev-timestamp:  the previous buffer timestamp
 410      * @prev-duration:   the previous buffer duration
 411      * @prev-offset:     the previous buffer offset
 412      * @prev-offset-end: the previous buffer offset end
 413      * @cur-timestamp:   the current buffer timestamp
 414      * @cur-duration:    the current buffer duration
 415      * @cur-offset:      the current buffer offset
 416      * @cur-offset-end:  the current buffer offset end
 417      *
 418      * This bus message gets emitted if the check-imperfect-offset
 419      * property is set and there is a gap in offsets between the
 420      * last buffer and the newly received buffer.
 421      */
 422     gst_element_post_message (GST_ELEMENT (identity),
 423         gst_message_new_element (GST_OBJECT (identity),
 424             gst_structure_new ("imperfect-offset", "prev-timestamp",
 425                 G_TYPE_UINT64, identity->prev_timestamp, "prev-duration",
 426                 G_TYPE_UINT64, identity->prev_duration, "prev-offset",
 427                 G_TYPE_UINT64, identity->prev_offset, "prev-offset-end",
 428                 G_TYPE_UINT64, identity->prev_offset_end, "cur-timestamp",
 429                 G_TYPE_UINT64, GST_BUFFER_TIMESTAMP (buf), "cur-duration",
 430                 G_TYPE_UINT64, GST_BUFFER_DURATION (buf), "cur-offset",
 431                 G_TYPE_UINT64, GST_BUFFER_OFFSET (buf), "cur-offset-end",
 432                 G_TYPE_UINT64, GST_BUFFER_OFFSET_END (buf), NULL)));
 433   } else {
 434     GST_DEBUG_OBJECT (identity, "can't check offset contiguity, no offset "
 435         "and/or offset_end were set on previous buffer");
 436   }
 437 }
 438
 439 static const gchar *
 440 print_pretty_time (gchar * ts_str, gsize ts_str_len, GstClockTime ts)
 441 {
 442   if (ts == GST_CLOCK_TIME_NONE)
 443     return "none";
 444
 445   g_snprintf (ts_str, ts_str_len, "%" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
 446   return ts_str;
 447 }
 448
 449 static void
 450 gst_identity_update_last_message_for_buffer (GstIdentity * identity,
 451     const gchar * action, GstBuffer * buf, gsize size)
 452 {
 453   gchar dts_str[64], pts_str[64], dur_str[64];
 454   gchar flag_str[100];
 455
 456   GST_OBJECT_LOCK (identity);
 457
 458   {
 459     const char *flag_list[15] = {
 460       "", "", "", "", "live", "decode-only", "discont", "resync", "corrupted",
 461       "marker", "header", "gap", "droppable", "delta-unit", "in-caps"
 462     };
 463     int i;
 464     char *end = flag_str;
 465     end[0] = '\0';
 466     for (i = 0; i < G_N_ELEMENTS (flag_list); i++) {
 467       if (GST_MINI_OBJECT_CAST (buf)->flags & (1 << i)) {
 468         strcpy (end, flag_list[i]);
 469         end += strlen (end);
 470         end[0] = ' ';
 471         end[1] = '\0';
 472         end++;
 473       }
 474     }
 475   }
 476
 477   g_free (identity->last_message);
 478   identity->last_message = g_strdup_printf ("%s   ******* (%s:%s) "
 479       "(%" G_GSIZE_FORMAT " bytes, dts: %s, pts:%s, duration: %s, offset: %"
 480       G_GINT64_FORMAT ", " "offset_end: % " G_GINT64_FORMAT
 481       ", flags: %d %s) %p", action,
 482       GST_DEBUG_PAD_NAME (GST_BASE_TRANSFORM_CAST (identity)->sinkpad), size,
 483       print_pretty_time (dts_str, sizeof (dts_str), GST_BUFFER_DTS (buf)),
 484       print_pretty_time (pts_str, sizeof (pts_str), GST_BUFFER_PTS (buf)),
 485       print_pretty_time (dur_str, sizeof (dur_str), GST_BUFFER_DURATION (buf)),
 486       GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf),
 487       GST_BUFFER_FLAGS (buf), flag_str, buf);
 488
 489   GST_OBJECT_UNLOCK (identity);
 490
 491   gst_identity_notify_last_message (identity);
 492 }
 493
 494 static GstFlowReturn
 495 gst_identity_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
 496 {
 497   GstFlowReturn ret = GST_FLOW_OK;
 498   GstIdentity *identity = GST_IDENTITY (trans);
 499   GstClockTime runtimestamp = G_GINT64_CONSTANT (0);
 500   gsize size;
 501
 502   size = gst_buffer_get_size (buf);
 503
 504   if (identity->check_imperfect_timestamp)
 505     gst_identity_check_imperfect_timestamp (identity, buf);
 506   if (identity->check_imperfect_offset)
 507     gst_identity_check_imperfect_offset (identity, buf);
 508
 509   /* update prev values */
 510   identity->prev_timestamp = GST_BUFFER_TIMESTAMP (buf);
 511   identity->prev_duration = GST_BUFFER_DURATION (buf);
 512   identity->prev_offset_end = GST_BUFFER_OFFSET_END (buf);
 513   identity->prev_offset = GST_BUFFER_OFFSET (buf);
 514
 515   if (identity->error_after >= 0) {
 516     identity->error_after--;
 517     if (identity->error_after == 0)
 518       goto error_after;
 519   }
 520
 521   if (identity->drop_probability > 0.0) {
 522     if ((gfloat) (1.0 * rand () / (RAND_MAX)) < identity->drop_probability)
 523       goto dropped;
 524   }
 525
 526   if (identity->dump) {
 527     GstMapInfo info;
 528
 529     gst_buffer_map (buf, &info, GST_MAP_READ);
 530     gst_util_dump_mem (info.data, info.size);
 531     gst_buffer_unmap (buf, &info);
 532   }
 533
 534   if (!identity->silent) {
 535     gst_identity_update_last_message_for_buffer (identity, "chain", buf, size);
 536   }
 537
 538   if (identity->datarate > 0) {
 539     GstClockTime time = gst_util_uint64_scale_int (identity->offset,
 540         GST_SECOND, identity->datarate);
 541
 542     GST_BUFFER_TIMESTAMP (buf) = time;
 543     GST_BUFFER_DURATION (buf) = size * GST_SECOND / identity->datarate;
 544   }
 545
 546   if (identity->signal_handoffs)
 547     g_signal_emit (identity, gst_identity_signals[SIGNAL_HANDOFF], 0, buf);
 548
 549   if (trans->segment.format == GST_FORMAT_TIME)
 550     runtimestamp = gst_segment_to_running_time (&trans->segment,
 551         GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buf));
 552
 553   if ((identity->sync) && (trans->segment.format == GST_FORMAT_TIME)) {
 554     GstClock *clock;
 555
 556     GST_OBJECT_LOCK (identity);
 557     if ((clock = GST_ELEMENT (identity)->clock)) {
 558       GstClockReturn cret;
 559       GstClockTime timestamp;
 560
 561       timestamp = runtimestamp + GST_ELEMENT (identity)->base_time;
 562
 563       /* save id if we need to unlock */
 564       identity->clock_id = gst_clock_new_single_shot_id (clock, timestamp);
 565       GST_OBJECT_UNLOCK (identity);
 566
 567       cret = gst_clock_id_wait (identity->clock_id, NULL);
 568
 569       GST_OBJECT_LOCK (identity);
 570       if (identity->clock_id) {
 571         gst_clock_id_unref (identity->clock_id);
 572         identity->clock_id = NULL;
 573       }
 574       if (cret == GST_CLOCK_UNSCHEDULED)
 575         ret = GST_FLOW_EOS;
 576     }
 577     GST_OBJECT_UNLOCK (identity);
 578   }
 579
 580   identity->offset += size;
 581
 582   if (identity->sleep_time && ret == GST_FLOW_OK)
 583     g_usleep (identity->sleep_time);
 584
 585   if (identity->single_segment && (trans->segment.format == GST_FORMAT_TIME)
 586       && (ret == GST_FLOW_OK)) {
 587     GST_BUFFER_TIMESTAMP (buf) = runtimestamp;
 588     GST_BUFFER_OFFSET (buf) = GST_CLOCK_TIME_NONE;
 589     GST_BUFFER_OFFSET_END (buf) = GST_CLOCK_TIME_NONE;
 590   }
 591
 592   return ret;
 593
 594   /* ERRORS */
 595 error_after:
 596   {
 597     GST_ELEMENT_ERROR (identity, CORE, FAILED,
 598         (_("Failed after iterations as requested.")), (NULL));
 599     return GST_FLOW_ERROR;
 600   }
 601 dropped:
 602   {
 603     if (!identity->silent) {
 604       gst_identity_update_last_message_for_buffer (identity, "dropping", buf,
 605           size);
 606     }
 607     /* return DROPPED to basetransform. */
 608     return GST_BASE_TRANSFORM_FLOW_DROPPED;
 609   }
 610 }
 611
 612 static void
 613 gst_identity_set_property (GObject * object, guint prop_id,
 614     const GValue * value, GParamSpec * pspec)
 615 {
 616   GstIdentity *identity;
 617
 618   identity = GST_IDENTITY (object);
 619
 620   switch (prop_id) {
 621     case PROP_SLEEP_TIME:
 622       identity->sleep_time = g_value_get_uint (value);
 623       break;
 624     case PROP_SILENT:
 625       identity->silent = g_value_get_boolean (value);
 626       break;
 627     case PROP_SINGLE_SEGMENT:
 628       identity->single_segment = g_value_get_boolean (value);
 629       break;
 630     case PROP_DUMP:
 631       identity->dump = g_value_get_boolean (value);
 632       break;
 633     case PROP_ERROR_AFTER:
 634       identity->error_after = g_value_get_int (value);
 635       break;
 636     case PROP_DROP_PROBABILITY:
 637       identity->drop_probability = g_value_get_float (value);
 638       break;
 639     case PROP_DATARATE:
 640       identity->datarate = g_value_get_int (value);
 641       break;
 642     case PROP_SYNC:
 643       identity->sync = g_value_get_boolean (value);
 644       break;
 645     case PROP_CHECK_IMPERFECT_TIMESTAMP:
 646       identity->check_imperfect_timestamp = g_value_get_boolean (value);
 647       break;
 648     case PROP_CHECK_IMPERFECT_OFFSET:
 649       identity->check_imperfect_offset = g_value_get_boolean (value);
 650       break;
 651     case PROP_SIGNAL_HANDOFFS:
 652       identity->signal_handoffs = g_value_get_boolean (value);
 653       break;
 654     default:
 655       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 656       break;
 657   }
 658   if (identity->datarate > 0 || identity->single_segment)
 659     gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), FALSE);
 660   else
 661     gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), TRUE);
 662 }
 663
 664 static void
 665 gst_identity_get_property (GObject * object, guint prop_id, GValue * value,
 666     GParamSpec * pspec)
 667 {
 668   GstIdentity *identity;
 669
 670   identity = GST_IDENTITY (object);
 671
 672   switch (prop_id) {
 673     case PROP_SLEEP_TIME:
 674       g_value_set_uint (value, identity->sleep_time);
 675       break;
 676     case PROP_ERROR_AFTER:
 677       g_value_set_int (value, identity->error_after);
 678       break;
 679     case PROP_DROP_PROBABILITY:
 680       g_value_set_float (value, identity->drop_probability);
 681       break;
 682     case PROP_DATARATE:
 683       g_value_set_int (value, identity->datarate);
 684       break;
 685     case PROP_SILENT:
 686       g_value_set_boolean (value, identity->silent);
 687       break;
 688     case PROP_SINGLE_SEGMENT:
 689       g_value_set_boolean (value, identity->single_segment);
 690       break;
 691     case PROP_DUMP:
 692       g_value_set_boolean (value, identity->dump);
 693       break;
 694     case PROP_LAST_MESSAGE:
 695       GST_OBJECT_LOCK (identity);
 696       g_value_set_string (value, identity->last_message);
 697       GST_OBJECT_UNLOCK (identity);
 698       break;
 699     case PROP_SYNC:
 700       g_value_set_boolean (value, identity->sync);
 701       break;
 702     case PROP_CHECK_IMPERFECT_TIMESTAMP:
 703       g_value_set_boolean (value, identity->check_imperfect_timestamp);
 704       break;
 705     case PROP_CHECK_IMPERFECT_OFFSET:
 706       g_value_set_boolean (value, identity->check_imperfect_offset);
 707       break;
 708     case PROP_SIGNAL_HANDOFFS:
 709       g_value_set_boolean (value, identity->signal_handoffs);
 710       break;
 711     default:
 712       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 713       break;
 714   }
 715 }
 716
 717 static gboolean
 718 gst_identity_start (GstBaseTransform * trans)
 719 {
 720   GstIdentity *identity;
 721
 722   identity = GST_IDENTITY (trans);
 723
 724   identity->offset = 0;
 725   identity->prev_timestamp = GST_CLOCK_TIME_NONE;
 726   identity->prev_duration = GST_CLOCK_TIME_NONE;
 727   identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
 728   identity->prev_offset = GST_BUFFER_OFFSET_NONE;
 729
 730   return TRUE;
 731 }
 732
 733 static gboolean
 734 gst_identity_stop (GstBaseTransform * trans)
 735 {
 736   GstIdentity *identity;
 737
 738   identity = GST_IDENTITY (trans);
 739
 740   GST_OBJECT_LOCK (identity);
 741   g_free (identity->last_message);
 742   identity->last_message = NULL;
 743   GST_OBJECT_UNLOCK (identity);
 744
 745   return TRUE;
 746 }
 747
 748 static GstStateChangeReturn
 749 gst_identity_change_state (GstElement * element, GstStateChange transition)
 750 {
 751   GstStateChangeReturn ret;
 752   GstIdentity *identity = GST_IDENTITY (element);
 753
 754   switch (transition) {
 755     case GST_STATE_CHANGE_NULL_TO_READY:
 756       break;
 757     case GST_STATE_CHANGE_READY_TO_PAUSED:
 758       break;
 759     case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
 760       break;
 761     case GST_STATE_CHANGE_PAUSED_TO_READY:
 762       GST_OBJECT_LOCK (identity);
 763       if (identity->clock_id) {
 764         GST_DEBUG_OBJECT (identity, "unlock clock wait");
 765         gst_clock_id_unschedule (identity->clock_id);
 766         gst_clock_id_unref (identity->clock_id);
 767         identity->clock_id = NULL;
 768       }
 769       GST_OBJECT_UNLOCK (identity);
 770       break;
 771     default:
 772       break;
 773   }
 774
 775   ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
 776
 777   switch (transition) {
 778     case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
 779       break;
 780     case GST_STATE_CHANGE_PAUSED_TO_READY:
 781       break;
 782     case GST_STATE_CHANGE_READY_TO_NULL:
 783       break;
 784     default:
 785       break;
 786   }
 787
 788   return ret;
 789 }