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., 51 Franklin St, Fifth Floor,
  21  * Boston, MA 02110-1301, 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 "gstelements_private.h"
  38 #include "../../gst/gst-i18n-lib.h"
  39 #include "gstidentity.h"
  40
  41 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
  42     GST_PAD_SINK,
  43     GST_PAD_ALWAYS,
  44     GST_STATIC_CAPS_ANY);
  45
  46 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
  47     GST_PAD_SRC,
  48     GST_PAD_ALWAYS,
  49     GST_STATIC_CAPS_ANY);
  50
  51 GST_DEBUG_CATEGORY_STATIC (gst_identity_debug);
  52 #define GST_CAT_DEFAULT gst_identity_debug
  53
  54 /* Identity signals and args */
  55 enum
  56 {
  57   SIGNAL_HANDOFF,
  58   /* FILL ME */
  59   LAST_SIGNAL
  60 };
  61
  62 #define DEFAULT_SLEEP_TIME              0
  63 #define DEFAULT_DUPLICATE               1
  64 #define DEFAULT_ERROR_AFTER             -1
  65 #define DEFAULT_DROP_PROBABILITY        0.0
  66 #define DEFAULT_DATARATE                0
  67 #define DEFAULT_SILENT                  TRUE
  68 #define DEFAULT_SINGLE_SEGMENT          FALSE
  69 #define DEFAULT_DUMP                    FALSE
  70 #define DEFAULT_SYNC                    FALSE
  71 #define DEFAULT_CHECK_IMPERFECT_TIMESTAMP FALSE
  72 #define DEFAULT_CHECK_IMPERFECT_OFFSET    FALSE
  73 #define DEFAULT_SIGNAL_HANDOFFS           TRUE
  74
  75 enum
  76 {
  77   PROP_0,
  78   PROP_SLEEP_TIME,
  79   PROP_ERROR_AFTER,
  80   PROP_DROP_PROBABILITY,
  81   PROP_DATARATE,
  82   PROP_SILENT,
  83   PROP_SINGLE_SEGMENT,
  84   PROP_LAST_MESSAGE,
  85   PROP_DUMP,
  86   PROP_SYNC,
  87   PROP_CHECK_IMPERFECT_TIMESTAMP,
  88   PROP_CHECK_IMPERFECT_OFFSET,
  89   PROP_SIGNAL_HANDOFFS
  90 };
  91
  92
  93 #define _do_init \
  94     GST_DEBUG_CATEGORY_INIT (gst_identity_debug, "identity", 0, "identity element");
  95 #define gst_identity_parent_class parent_class
  96 G_DEFINE_TYPE_WITH_CODE (GstIdentity, gst_identity, GST_TYPE_BASE_TRANSFORM,
  97     _do_init);
  98
  99 static void gst_identity_finalize (GObject * object);
 100 static void gst_identity_set_property (GObject * object, guint prop_id,
 101     const GValue * value, GParamSpec * pspec);
 102 static void gst_identity_get_property (GObject * object, guint prop_id,
 103     GValue * value, GParamSpec * pspec);
 104
 105 static gboolean gst_identity_sink_event (GstBaseTransform * trans,
 106     GstEvent * event);
 107 static GstFlowReturn gst_identity_transform_ip (GstBaseTransform * trans,
 108     GstBuffer * buf);
 109 static gboolean gst_identity_start (GstBaseTransform * trans);
 110 static gboolean gst_identity_stop (GstBaseTransform * trans);
 111 static GstStateChangeReturn gst_identity_change_state (GstElement * element,
 112     GstStateChange transition);
 113 static gboolean gst_identity_accept_caps (GstBaseTransform * base,
 114     GstPadDirection direction, GstCaps * caps);
 115
 116 static guint gst_identity_signals[LAST_SIGNAL] = { 0 };
 117
 118 static GParamSpec *pspec_last_message = NULL;
 119
 120 static void
 121 gst_identity_finalize (GObject * object)
 122 {
 123   GstIdentity *identity;
 124
 125   identity = GST_IDENTITY (object);
 126
 127   g_free (identity->last_message);
 128
 129   G_OBJECT_CLASS (parent_class)->finalize (object);
 130 }
 131
 132 static void
 133 gst_identity_class_init (GstIdentityClass * klass)
 134 {
 135   GObjectClass *gobject_class;
 136   GstElementClass *gstelement_class;
 137   GstBaseTransformClass *gstbasetrans_class;
 138
 139   gobject_class = G_OBJECT_CLASS (klass);
 140   gstelement_class = GST_ELEMENT_CLASS (klass);
 141   gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
 142
 143   gobject_class->set_property = gst_identity_set_property;
 144   gobject_class->get_property = gst_identity_get_property;
 145
 146   g_object_class_install_property (gobject_class, PROP_SLEEP_TIME,
 147       g_param_spec_uint ("sleep-time", "Sleep time",
 148           "Microseconds to sleep between processing", 0, G_MAXUINT,
 149           DEFAULT_SLEEP_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 150   g_object_class_install_property (gobject_class, PROP_ERROR_AFTER,
 151       g_param_spec_int ("error-after", "Error After", "Error after N buffers",
 152           G_MININT, G_MAXINT, DEFAULT_ERROR_AFTER,
 153           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 154   g_object_class_install_property (gobject_class, PROP_DROP_PROBABILITY,
 155       g_param_spec_float ("drop-probability", "Drop Probability",
 156           "The Probability a buffer is dropped", 0.0, 1.0,
 157           DEFAULT_DROP_PROBABILITY,
 158           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 159   g_object_class_install_property (gobject_class, PROP_DATARATE,
 160       g_param_spec_int ("datarate", "Datarate",
 161           "(Re)timestamps buffers with number of bytes per second (0 = inactive)",
 162           0, G_MAXINT, DEFAULT_DATARATE,
 163           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 164   g_object_class_install_property (gobject_class, PROP_SILENT,
 165       g_param_spec_boolean ("silent", "silent", "silent", DEFAULT_SILENT,
 166           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 167   g_object_class_install_property (gobject_class, PROP_SINGLE_SEGMENT,
 168       g_param_spec_boolean ("single-segment", "Single Segment",
 169           "Timestamp buffers and eat segments so as to appear as one segment",
 170           DEFAULT_SINGLE_SEGMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 171   pspec_last_message = g_param_spec_string ("last-message", "last-message",
 172       "last-message", NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 173   g_object_class_install_property (gobject_class, PROP_LAST_MESSAGE,
 174       pspec_last_message);
 175   g_object_class_install_property (gobject_class, PROP_DUMP,
 176       g_param_spec_boolean ("dump", "Dump", "Dump buffer contents to stdout",
 177           DEFAULT_DUMP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 178   g_object_class_install_property (gobject_class, PROP_SYNC,
 179       g_param_spec_boolean ("sync", "Synchronize",
 180           "Synchronize to pipeline clock", DEFAULT_SYNC,
 181           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 182   g_object_class_install_property (gobject_class,
 183       PROP_CHECK_IMPERFECT_TIMESTAMP,
 184       g_param_spec_boolean ("check-imperfect-timestamp",
 185           "Check for discontiguous timestamps",
 186           "Send element messages if timestamps and durations do not match up",
 187           DEFAULT_CHECK_IMPERFECT_TIMESTAMP,
 188           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 189   g_object_class_install_property (gobject_class, PROP_CHECK_IMPERFECT_OFFSET,
 190       g_param_spec_boolean ("check-imperfect-offset",
 191           "Check for discontiguous offset",
 192           "Send element messages if offset and offset_end do not match up",
 193           DEFAULT_CHECK_IMPERFECT_OFFSET,
 194           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 195
 196   /**
 197    * GstIdentity:signal-handoffs
 198    *
 199    * If set to #TRUE, the identity will emit a handoff signal when handling a buffer.
 200    * When set to #FALSE, no signal will be emitted, which might improve performance.
 201    */
 202   g_object_class_install_property (gobject_class, PROP_SIGNAL_HANDOFFS,
 203       g_param_spec_boolean ("signal-handoffs",
 204           "Signal handoffs", "Send a signal before pushing the buffer",
 205           DEFAULT_SIGNAL_HANDOFFS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 206
 207   /**
 208    * GstIdentity::handoff:
 209    * @identity: the identity instance
 210    * @buffer: the buffer that just has been received
 211    * @pad: the pad that received it
 212    *
 213    * This signal gets emitted before passing the buffer downstream.
 214    */
 215   gst_identity_signals[SIGNAL_HANDOFF] =
 216       g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
 217       G_STRUCT_OFFSET (GstIdentityClass, handoff), NULL, NULL,
 218       g_cclosure_marshal_generic, G_TYPE_NONE, 1,
 219       GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE);
 220
 221   gobject_class->finalize = gst_identity_finalize;
 222
 223   gst_element_class_set_static_metadata (gstelement_class,
 224       "Identity",
 225       "Generic",
 226       "Pass data without modification", "Erik Walthinsen <omega@cse.ogi.edu>");
 227   gst_element_class_add_pad_template (gstelement_class,
 228       gst_static_pad_template_get (&srctemplate));
 229   gst_element_class_add_pad_template (gstelement_class,
 230       gst_static_pad_template_get (&sinktemplate));
 231
 232   gstelement_class->change_state =
 233       GST_DEBUG_FUNCPTR (gst_identity_change_state);
 234
 235   gstbasetrans_class->sink_event = GST_DEBUG_FUNCPTR (gst_identity_sink_event);
 236   gstbasetrans_class->transform_ip =
 237       GST_DEBUG_FUNCPTR (gst_identity_transform_ip);
 238   gstbasetrans_class->start = GST_DEBUG_FUNCPTR (gst_identity_start);
 239   gstbasetrans_class->stop = GST_DEBUG_FUNCPTR (gst_identity_stop);
 240   gstbasetrans_class->accept_caps =
 241       GST_DEBUG_FUNCPTR (gst_identity_accept_caps);
 242 }
 243
 244 static void
 245 gst_identity_init (GstIdentity * identity)
 246 {
 247   identity->sleep_time = DEFAULT_SLEEP_TIME;
 248   identity->error_after = DEFAULT_ERROR_AFTER;
 249   identity->drop_probability = DEFAULT_DROP_PROBABILITY;
 250   identity->datarate = DEFAULT_DATARATE;
 251   identity->silent = DEFAULT_SILENT;
 252   identity->single_segment = DEFAULT_SINGLE_SEGMENT;
 253   identity->sync = DEFAULT_SYNC;
 254   identity->check_imperfect_timestamp = DEFAULT_CHECK_IMPERFECT_TIMESTAMP;
 255   identity->check_imperfect_offset = DEFAULT_CHECK_IMPERFECT_OFFSET;
 256   identity->dump = DEFAULT_DUMP;
 257   identity->last_message = NULL;
 258   identity->signal_handoffs = DEFAULT_SIGNAL_HANDOFFS;
 259
 260   gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM_CAST (identity), TRUE);
 261 }
 262
 263 static void
 264 gst_identity_notify_last_message (GstIdentity * identity)
 265 {
 266   g_object_notify_by_pspec ((GObject *) identity, pspec_last_message);
 267 }
 268
 269 static gboolean
 270 gst_identity_sink_event (GstBaseTransform * trans, GstEvent * event)
 271 {
 272   GstIdentity *identity;
 273   gboolean ret = TRUE;
 274
 275   identity = GST_IDENTITY (trans);
 276
 277   if (!identity->silent) {
 278     const GstStructure *s;
 279     const gchar *tstr;
 280     gchar *sstr;
 281
 282     GST_OBJECT_LOCK (identity);
 283     g_free (identity->last_message);
 284
 285     tstr = gst_event_type_get_name (GST_EVENT_TYPE (event));
 286     if ((s = gst_event_get_structure (event)))
 287       sstr = gst_structure_to_string (s);
 288     else
 289       sstr = g_strdup ("");
 290
 291     identity->last_message =
 292         g_strdup_printf ("event   ******* (%s:%s) E (type: %s (%d), %s) %p",
 293         GST_DEBUG_PAD_NAME (trans->sinkpad), tstr, GST_EVENT_TYPE (event),
 294         sstr, event);
 295     g_free (sstr);
 296     GST_OBJECT_UNLOCK (identity);
 297
 298     gst_identity_notify_last_message (identity);
 299   }
 300
 301   if (identity->single_segment && (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
 302     if (!trans->have_segment) {
 303       GstEvent *news;
 304       GstSegment segment;
 305
 306       gst_event_copy_segment (event, &segment);
 307       gst_event_copy_segment (event, &trans->segment);
 308       trans->have_segment = TRUE;
 309
 310       /* This is the first segment, send out a (0, -1) segment */
 311       gst_segment_init (&segment, segment.format);
 312       news = gst_event_new_segment (&segment);
 313
 314       gst_pad_event_default (trans->sinkpad, GST_OBJECT_CAST (trans), news);
 315     } else {
 316       /* need to track segment for proper running time */
 317       gst_event_copy_segment (event, &trans->segment);
 318     }
 319   }
 320
 321   /* also transform GAP timestamp similar to buffer timestamps */
 322   if (identity->single_segment && (GST_EVENT_TYPE (event) == GST_EVENT_GAP) &&
 323       trans->have_segment && trans->segment.format == GST_FORMAT_TIME) {
 324     GstClockTime start, dur;
 325
 326     gst_event_parse_gap (event, &start, &dur);
 327     if (GST_CLOCK_TIME_IS_VALID (start)) {
 328       start = gst_segment_to_running_time (&trans->segment,
 329           GST_FORMAT_TIME, start);
 330       gst_event_unref (event);
 331       event = gst_event_new_gap (start, dur);
 332     }
 333   }
 334
 335   /* Reset previous timestamp, duration and offsets on SEGMENT
 336    * to prevent false warnings when checking for perfect streams */
 337   if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
 338     identity->prev_timestamp = identity->prev_duration = GST_CLOCK_TIME_NONE;
 339     identity->prev_offset = identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
 340   }
 341
 342   if (identity->single_segment && GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
 343     /* eat up segments */
 344     gst_event_unref (event);
 345     ret = TRUE;
 346   } else {
 347     if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_START) {
 348       GST_OBJECT_LOCK (identity);
 349       if (identity->clock_id) {
 350         GST_DEBUG_OBJECT (identity, "unlock clock wait");
 351         gst_clock_id_unschedule (identity->clock_id);
 352         gst_clock_id_unref (identity->clock_id);
 353         identity->clock_id = NULL;
 354       }
 355       GST_OBJECT_UNLOCK (identity);
 356     }
 357
 358     ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
 359   }
 360
 361   return ret;
 362 }
 363
 364 static void
 365 gst_identity_check_imperfect_timestamp (GstIdentity * identity, GstBuffer * buf)
 366 {
 367   GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);
 368
 369   /* invalid timestamp drops us out of check.  FIXME: maybe warn ? */
 370   if (timestamp != GST_CLOCK_TIME_NONE) {
 371     /* check if we had a previous buffer to compare to */
 372     if (identity->prev_timestamp != GST_CLOCK_TIME_NONE &&
 373         identity->prev_duration != GST_CLOCK_TIME_NONE) {
 374       GstClockTime t_expected;
 375       GstClockTimeDiff dt;
 376
 377       t_expected = identity->prev_timestamp + identity->prev_duration;
 378       dt = GST_CLOCK_DIFF (t_expected, timestamp);
 379       if (dt != 0) {
 380         /*
 381          * "imperfect-timestamp" bus message:
 382          * @identity:        the identity instance
 383          * @delta:           the GST_CLOCK_DIFF to the prev timestamp
 384          * @prev-timestamp:  the previous buffer timestamp
 385          * @prev-duration:   the previous buffer duration
 386          * @prev-offset:     the previous buffer offset
 387          * @prev-offset-end: the previous buffer offset end
 388          * @cur-timestamp:   the current buffer timestamp
 389          * @cur-duration:    the current buffer duration
 390          * @cur-offset:      the current buffer offset
 391          * @cur-offset-end:  the current buffer offset end
 392          *
 393          * This bus message gets emitted if the check-imperfect-timestamp
 394          * property is set and there is a gap in time between the
 395          * last buffer and the newly received buffer.
 396          */
 397         gst_element_post_message (GST_ELEMENT (identity),
 398             gst_message_new_element (GST_OBJECT (identity),
 399                 gst_structure_new ("imperfect-timestamp",
 400                     "delta", G_TYPE_INT64, dt,
 401                     "prev-timestamp", G_TYPE_UINT64,
 402                     identity->prev_timestamp, "prev-duration", G_TYPE_UINT64,
 403                     identity->prev_duration, "prev-offset", G_TYPE_UINT64,
 404                     identity->prev_offset, "prev-offset-end", G_TYPE_UINT64,
 405                     identity->prev_offset_end, "cur-timestamp", G_TYPE_UINT64,
 406                     timestamp, "cur-duration", G_TYPE_UINT64,
 407                     GST_BUFFER_DURATION (buf), "cur-offset", G_TYPE_UINT64,
 408                     GST_BUFFER_OFFSET (buf), "cur-offset-end", G_TYPE_UINT64,
 409                     GST_BUFFER_OFFSET_END (buf), NULL)));
 410       }
 411     } else {
 412       GST_DEBUG_OBJECT (identity, "can't check data-contiguity, no "
 413           "offset_end was set on previous buffer");
 414     }
 415   }
 416 }
 417
 418 static void
 419 gst_identity_check_imperfect_offset (GstIdentity * identity, GstBuffer * buf)
 420 {
 421   guint64 offset;
 422
 423   offset = GST_BUFFER_OFFSET (buf);
 424
 425   if (identity->prev_offset_end != offset &&
 426       identity->prev_offset_end != GST_BUFFER_OFFSET_NONE &&
 427       offset != GST_BUFFER_OFFSET_NONE) {
 428     /*
 429      * "imperfect-offset" bus message:
 430      * @identity:        the identity instance
 431      * @prev-timestamp:  the previous buffer timestamp
 432      * @prev-duration:   the previous buffer duration
 433      * @prev-offset:     the previous buffer offset
 434      * @prev-offset-end: the previous buffer offset end
 435      * @cur-timestamp:   the current buffer timestamp
 436      * @cur-duration:    the current buffer duration
 437      * @cur-offset:      the current buffer offset
 438      * @cur-offset-end:  the current buffer offset end
 439      *
 440      * This bus message gets emitted if the check-imperfect-offset
 441      * property is set and there is a gap in offsets between the
 442      * last buffer and the newly received buffer.
 443      */
 444     gst_element_post_message (GST_ELEMENT (identity),
 445         gst_message_new_element (GST_OBJECT (identity),
 446             gst_structure_new ("imperfect-offset", "prev-timestamp",
 447                 G_TYPE_UINT64, identity->prev_timestamp, "prev-duration",
 448                 G_TYPE_UINT64, identity->prev_duration, "prev-offset",
 449                 G_TYPE_UINT64, identity->prev_offset, "prev-offset-end",
 450                 G_TYPE_UINT64, identity->prev_offset_end, "cur-timestamp",
 451                 G_TYPE_UINT64, GST_BUFFER_TIMESTAMP (buf), "cur-duration",
 452                 G_TYPE_UINT64, GST_BUFFER_DURATION (buf), "cur-offset",
 453                 G_TYPE_UINT64, GST_BUFFER_OFFSET (buf), "cur-offset-end",
 454                 G_TYPE_UINT64, GST_BUFFER_OFFSET_END (buf), NULL)));
 455   } else {
 456     GST_DEBUG_OBJECT (identity, "can't check offset contiguity, no offset "
 457         "and/or offset_end were set on previous buffer");
 458   }
 459 }
 460
 461 static const gchar *
 462 print_pretty_time (gchar * ts_str, gsize ts_str_len, GstClockTime ts)
 463 {
 464   if (ts == GST_CLOCK_TIME_NONE)
 465     return "none";
 466
 467   g_snprintf (ts_str, ts_str_len, "%" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
 468   return ts_str;
 469 }
 470
 471 static void
 472 gst_identity_update_last_message_for_buffer (GstIdentity * identity,
 473     const gchar * action, GstBuffer * buf, gsize size)
 474 {
 475   gchar dts_str[64], pts_str[64], dur_str[64];
 476   gchar *flag_str;
 477
 478   GST_OBJECT_LOCK (identity);
 479
 480   flag_str = gst_buffer_get_flags_string (buf);
 481
 482   g_free (identity->last_message);
 483   identity->last_message = g_strdup_printf ("%s   ******* (%s:%s) "
 484       "(%" G_GSIZE_FORMAT " bytes, dts: %s, pts:%s, duration: %s, offset: %"
 485       G_GINT64_FORMAT ", " "offset_end: % " G_GINT64_FORMAT
 486       ", flags: %08x %s) %p", action,
 487       GST_DEBUG_PAD_NAME (GST_BASE_TRANSFORM_CAST (identity)->sinkpad), size,
 488       print_pretty_time (dts_str, sizeof (dts_str), GST_BUFFER_DTS (buf)),
 489       print_pretty_time (pts_str, sizeof (pts_str), GST_BUFFER_PTS (buf)),
 490       print_pretty_time (dur_str, sizeof (dur_str), GST_BUFFER_DURATION (buf)),
 491       GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf),
 492       GST_BUFFER_FLAGS (buf), flag_str, buf);
 493   g_free (flag_str);
 494
 495   GST_OBJECT_UNLOCK (identity);
 496
 497   gst_identity_notify_last_message (identity);
 498 }
 499
 500 static GstFlowReturn
 501 gst_identity_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
 502 {
 503   GstFlowReturn ret = GST_FLOW_OK;
 504   GstIdentity *identity = GST_IDENTITY (trans);
 505   GstClockTime runtimestamp = G_GINT64_CONSTANT (0);
 506   gsize size;
 507
 508   size = gst_buffer_get_size (buf);
 509
 510   if (identity->check_imperfect_timestamp)
 511     gst_identity_check_imperfect_timestamp (identity, buf);
 512   if (identity->check_imperfect_offset)
 513     gst_identity_check_imperfect_offset (identity, buf);
 514
 515   /* update prev values */
 516   identity->prev_timestamp = GST_BUFFER_TIMESTAMP (buf);
 517   identity->prev_duration = GST_BUFFER_DURATION (buf);
 518   identity->prev_offset_end = GST_BUFFER_OFFSET_END (buf);
 519   identity->prev_offset = GST_BUFFER_OFFSET (buf);
 520
 521   if (identity->error_after >= 0) {
 522     identity->error_after--;
 523     if (identity->error_after == 0)
 524       goto error_after;
 525   }
 526
 527   if (identity->drop_probability > 0.0) {
 528     if ((gfloat) (1.0 * rand () / (RAND_MAX)) < identity->drop_probability)
 529       goto dropped;
 530   }
 531
 532   if (identity->dump) {
 533     GstMapInfo info;
 534
 535     gst_buffer_map (buf, &info, GST_MAP_READ);
 536     gst_util_dump_mem (info.data, info.size);
 537     gst_buffer_unmap (buf, &info);
 538   }
 539
 540   if (!identity->silent) {
 541     gst_identity_update_last_message_for_buffer (identity, "chain", buf, size);
 542   }
 543
 544   if (identity->datarate > 0) {
 545     GstClockTime time = gst_util_uint64_scale_int (identity->offset,
 546         GST_SECOND, identity->datarate);
 547
 548     GST_BUFFER_PTS (buf) = GST_BUFFER_DTS (buf) = time;
 549     GST_BUFFER_DURATION (buf) = size * GST_SECOND / identity->datarate;
 550   }
 551
 552   if (identity->signal_handoffs)
 553     g_signal_emit (identity, gst_identity_signals[SIGNAL_HANDOFF], 0, buf);
 554
 555   if (trans->segment.format == GST_FORMAT_TIME)
 556     runtimestamp = gst_segment_to_running_time (&trans->segment,
 557         GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buf));
 558
 559   if ((identity->sync) && (trans->segment.format == GST_FORMAT_TIME)) {
 560     GstClock *clock;
 561
 562     GST_OBJECT_LOCK (identity);
 563     if ((clock = GST_ELEMENT (identity)->clock)) {
 564       GstClockReturn cret;
 565       GstClockTime timestamp;
 566
 567       timestamp = runtimestamp + GST_ELEMENT (identity)->base_time;
 568
 569       /* save id if we need to unlock */
 570       identity->clock_id = gst_clock_new_single_shot_id (clock, timestamp);
 571       GST_OBJECT_UNLOCK (identity);
 572
 573       cret = gst_clock_id_wait (identity->clock_id, NULL);
 574
 575       GST_OBJECT_LOCK (identity);
 576       if (identity->clock_id) {
 577         gst_clock_id_unref (identity->clock_id);
 578         identity->clock_id = NULL;
 579       }
 580       if (cret == GST_CLOCK_UNSCHEDULED)
 581         ret = GST_FLOW_EOS;
 582     }
 583     GST_OBJECT_UNLOCK (identity);
 584   }
 585
 586   identity->offset += size;
 587
 588   if (identity->sleep_time && ret == GST_FLOW_OK)
 589     g_usleep (identity->sleep_time);
 590
 591   if (identity->single_segment && (trans->segment.format == GST_FORMAT_TIME)
 592       && (ret == GST_FLOW_OK)) {
 593     GST_BUFFER_PTS (buf) = GST_BUFFER_DTS (buf) = runtimestamp;
 594     GST_BUFFER_OFFSET (buf) = GST_CLOCK_TIME_NONE;
 595     GST_BUFFER_OFFSET_END (buf) = GST_CLOCK_TIME_NONE;
 596   }
 597
 598   return ret;
 599
 600   /* ERRORS */
 601 error_after:
 602   {
 603     GST_ELEMENT_ERROR (identity, CORE, FAILED,
 604         (_("Failed after iterations as requested.")), (NULL));
 605     return GST_FLOW_ERROR;
 606   }
 607 dropped:
 608   {
 609     if (!identity->silent) {
 610       gst_identity_update_last_message_for_buffer (identity, "dropping", buf,
 611           size);
 612     }
 613     /* return DROPPED to basetransform. */
 614     return GST_BASE_TRANSFORM_FLOW_DROPPED;
 615   }
 616 }
 617
 618 static void
 619 gst_identity_set_property (GObject * object, guint prop_id,
 620     const GValue * value, GParamSpec * pspec)
 621 {
 622   GstIdentity *identity;
 623
 624   identity = GST_IDENTITY (object);
 625
 626   switch (prop_id) {
 627     case PROP_SLEEP_TIME:
 628       identity->sleep_time = g_value_get_uint (value);
 629       break;
 630     case PROP_SILENT:
 631       identity->silent = g_value_get_boolean (value);
 632       break;
 633     case PROP_SINGLE_SEGMENT:
 634       identity->single_segment = g_value_get_boolean (value);
 635       break;
 636     case PROP_DUMP:
 637       identity->dump = g_value_get_boolean (value);
 638       break;
 639     case PROP_ERROR_AFTER:
 640       identity->error_after = g_value_get_int (value);
 641       break;
 642     case PROP_DROP_PROBABILITY:
 643       identity->drop_probability = g_value_get_float (value);
 644       break;
 645     case PROP_DATARATE:
 646       identity->datarate = g_value_get_int (value);
 647       break;
 648     case PROP_SYNC:
 649       identity->sync = g_value_get_boolean (value);
 650       break;
 651     case PROP_CHECK_IMPERFECT_TIMESTAMP:
 652       identity->check_imperfect_timestamp = g_value_get_boolean (value);
 653       break;
 654     case PROP_CHECK_IMPERFECT_OFFSET:
 655       identity->check_imperfect_offset = g_value_get_boolean (value);
 656       break;
 657     case PROP_SIGNAL_HANDOFFS:
 658       identity->signal_handoffs = g_value_get_boolean (value);
 659       break;
 660     default:
 661       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 662       break;
 663   }
 664   if (identity->datarate > 0 || identity->single_segment)
 665     gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), FALSE);
 666   else
 667     gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), TRUE);
 668 }
 669
 670 static void
 671 gst_identity_get_property (GObject * object, guint prop_id, GValue * value,
 672     GParamSpec * pspec)
 673 {
 674   GstIdentity *identity;
 675
 676   identity = GST_IDENTITY (object);
 677
 678   switch (prop_id) {
 679     case PROP_SLEEP_TIME:
 680       g_value_set_uint (value, identity->sleep_time);
 681       break;
 682     case PROP_ERROR_AFTER:
 683       g_value_set_int (value, identity->error_after);
 684       break;
 685     case PROP_DROP_PROBABILITY:
 686       g_value_set_float (value, identity->drop_probability);
 687       break;
 688     case PROP_DATARATE:
 689       g_value_set_int (value, identity->datarate);
 690       break;
 691     case PROP_SILENT:
 692       g_value_set_boolean (value, identity->silent);
 693       break;
 694     case PROP_SINGLE_SEGMENT:
 695       g_value_set_boolean (value, identity->single_segment);
 696       break;
 697     case PROP_DUMP:
 698       g_value_set_boolean (value, identity->dump);
 699       break;
 700     case PROP_LAST_MESSAGE:
 701       GST_OBJECT_LOCK (identity);
 702       g_value_set_string (value, identity->last_message);
 703       GST_OBJECT_UNLOCK (identity);
 704       break;
 705     case PROP_SYNC:
 706       g_value_set_boolean (value, identity->sync);
 707       break;
 708     case PROP_CHECK_IMPERFECT_TIMESTAMP:
 709       g_value_set_boolean (value, identity->check_imperfect_timestamp);
 710       break;
 711     case PROP_CHECK_IMPERFECT_OFFSET:
 712       g_value_set_boolean (value, identity->check_imperfect_offset);
 713       break;
 714     case PROP_SIGNAL_HANDOFFS:
 715       g_value_set_boolean (value, identity->signal_handoffs);
 716       break;
 717     default:
 718       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 719       break;
 720   }
 721 }
 722
 723 static gboolean
 724 gst_identity_start (GstBaseTransform * trans)
 725 {
 726   GstIdentity *identity;
 727
 728   identity = GST_IDENTITY (trans);
 729
 730   identity->offset = 0;
 731   identity->prev_timestamp = GST_CLOCK_TIME_NONE;
 732   identity->prev_duration = GST_CLOCK_TIME_NONE;
 733   identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
 734   identity->prev_offset = GST_BUFFER_OFFSET_NONE;
 735
 736   return TRUE;
 737 }
 738
 739 static gboolean
 740 gst_identity_stop (GstBaseTransform * trans)
 741 {
 742   GstIdentity *identity;
 743
 744   identity = GST_IDENTITY (trans);
 745
 746   GST_OBJECT_LOCK (identity);
 747   g_free (identity->last_message);
 748   identity->last_message = NULL;
 749   GST_OBJECT_UNLOCK (identity);
 750
 751   return TRUE;
 752 }
 753
 754 static gboolean
 755 gst_identity_accept_caps (GstBaseTransform * base,
 756     GstPadDirection direction, GstCaps * caps)
 757 {
 758   gboolean ret;
 759   GstPad *pad;
 760
 761   /* Proxy accept-caps */
 762
 763   if (direction == GST_PAD_SRC)
 764     pad = GST_BASE_TRANSFORM_SINK_PAD (base);
 765   else
 766     pad = GST_BASE_TRANSFORM_SRC_PAD (base);
 767
 768   ret = gst_pad_peer_query_accept_caps (pad, caps);
 769
 770   return ret;
 771 }
 772
 773 static GstStateChangeReturn
 774 gst_identity_change_state (GstElement * element, GstStateChange transition)
 775 {
 776   GstStateChangeReturn ret;
 777   GstIdentity *identity = GST_IDENTITY (element);
 778
 779   switch (transition) {
 780     case GST_STATE_CHANGE_NULL_TO_READY:
 781       break;
 782     case GST_STATE_CHANGE_READY_TO_PAUSED:
 783       break;
 784     case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
 785       break;
 786     case GST_STATE_CHANGE_PAUSED_TO_READY:
 787       GST_OBJECT_LOCK (identity);
 788       if (identity->clock_id) {
 789         GST_DEBUG_OBJECT (identity, "unlock clock wait");
 790         gst_clock_id_unschedule (identity->clock_id);
 791         gst_clock_id_unref (identity->clock_id);
 792         identity->clock_id = NULL;
 793       }
 794       GST_OBJECT_UNLOCK (identity);
 795       break;
 796     default:
 797       break;
 798   }
 799
 800   ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
 801
 802   switch (transition) {
 803     case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
 804       break;
 805     case GST_STATE_CHANGE_PAUSED_TO_READY:
 806       break;
 807     case GST_STATE_CHANGE_READY_TO_NULL:
 808       break;
 809     default:
 810       break;
 811   }
 812
 813   return ret;
 814 }