2 * Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
4 * gstlatency.c: tracing module that logs processing latency stats
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
22 * SECTION:element-latencytracer
23 * @short_description: log processing latency stats
25 * A tracing module that determines src-to-sink latencies by injecting custom
26 * events at sources and process them at sinks. This elements supports tracing
27 * the entire pipeline latency and per element latency. By default, only
28 * pipeline latency is traced. The 'flags' parameter can be used to enabled
32 * GST_TRACERS="latency(flags=pipeline+element)" GST_DEBUG=GST_TRACER:7 ./...
35 /* TODO(ensonic): if there are two sources feeding into a mixer/muxer and later
36 * we fan-out with tee and have two sinks, each sink would get all two events,
37 * the later event would overwrite the former. Unfortunately when the buffer
38 * arrives on the sink we don't know to which event it correlates. Better would
39 * be to use the buffer meta in 1.0 instead of the event. Or we track a min/max
47 #include "gstlatency.h"
49 GST_DEBUG_CATEGORY_STATIC (gst_latency_debug);
50 #define GST_CAT_DEFAULT gst_latency_debug
53 GST_DEBUG_CATEGORY_INIT (gst_latency_debug, "latency", 0, "latency tracer");
54 #define gst_latency_tracer_parent_class parent_class
55 G_DEFINE_TYPE_WITH_CODE (GstLatencyTracer, gst_latency_tracer, GST_TYPE_TRACER,
58 static void latency_query_stack_destroy (gpointer data);
60 static GQuark latency_probe_id;
61 static GQuark sub_latency_probe_id;
62 static GQuark latency_probe_pad;
63 static GQuark latency_probe_element;
64 static GQuark latency_probe_element_id;
65 static GQuark latency_probe_ts;
66 static GQuark drop_sub_latency_quark;
68 static GstTracerRecord *tr_latency;
69 static GstTracerRecord *tr_element_latency;
70 static GstTracerRecord *tr_element_reported_latency;
72 /* The private stack for each thread */
73 static GPrivate latency_query_stack =
74 G_PRIVATE_INIT (latency_query_stack_destroy);
76 struct LatencyQueryTableValue
78 GstElement *peer_element;
86 * Get the element/bin owning the pad.
92 * out: the element that contains the peer of the proxy
95 * out: the bin owning the ghostpad
97 /* TODO(ensonic): gst_pad_get_parent_element() would not work here, should we
98 * add this as new api, e.g. gst_pad_find_parent_element();
101 get_real_pad_parent (GstPad * pad)
108 parent = GST_OBJECT_PARENT (pad);
110 /* if parent of pad is a ghost-pad, then pad is a proxy_pad */
111 if (parent && GST_IS_GHOST_PAD (parent)) {
112 pad = GST_PAD_CAST (parent);
113 parent = GST_OBJECT_PARENT (pad);
115 return GST_ELEMENT_CAST (parent);
119 latency_query_table_value_destroy (gpointer data)
121 struct LatencyQueryTableValue *v = data;
123 /* Unref the element */
124 if (v->peer_element) {
125 gst_object_unref (v->peer_element);
126 v->peer_element = NULL;
129 /* Destroy the structure */
134 latency_query_stack_destroy (gpointer data)
136 GQueue *queue = data;
137 g_queue_free_full (queue, latency_query_table_value_destroy);
141 local_latency_query_stack_get (void)
143 /* Make sure the stack exists */
144 GQueue *stack = g_private_get (&latency_query_stack);
146 g_private_set (&latency_query_stack, g_queue_new ());
147 stack = g_private_get (&latency_query_stack);
154 static struct LatencyQueryTableValue *
155 local_latency_query_stack_pop (void)
157 GQueue *stack = local_latency_query_stack_get ();
158 return g_queue_pop_tail (stack);
162 local_latency_query_stack_push (struct LatencyQueryTableValue *value)
164 GQueue *stack = local_latency_query_stack_get ();
165 g_queue_push_tail (stack, value);
171 log_latency (const GstStructure * data, GstElement * sink_parent,
172 GstPad * sink_pad, guint64 sink_ts)
175 const char *src, *element_src, *id_element_src;
177 gchar *sink, *element_sink, *id_element_sink;
179 value = gst_structure_id_get_value (data, latency_probe_ts);
180 src_ts = g_value_get_uint64 (value);
182 value = gst_structure_id_get_value (data, latency_probe_pad);
183 src = g_value_get_string (value);
185 value = gst_structure_id_get_value (data, latency_probe_element);
186 element_src = g_value_get_string (value);
188 value = gst_structure_id_get_value (data, latency_probe_element_id);
189 id_element_src = g_value_get_string (value);
191 id_element_sink = g_strdup_printf ("%p", sink_parent);
192 element_sink = gst_element_get_name (sink_parent);
193 sink = gst_pad_get_name (sink_pad);
194 gst_tracer_record_log (tr_latency, id_element_src, element_src, src,
195 id_element_sink, element_sink, sink, GST_CLOCK_DIFF (src_ts, sink_ts),
198 g_free (element_sink);
199 g_free (id_element_sink);
203 log_element_latency (const GstStructure * data, GstElement * parent,
204 GstPad * pad, guint64 sink_ts)
207 gchar *pad_name, *element_name, *element_id;
210 element_id = g_strdup_printf ("%p", parent);
211 element_name = gst_element_get_name (parent);
212 pad_name = gst_pad_get_name (pad);
216 value = gst_structure_id_get_value (data, latency_probe_ts);
217 src_ts = g_value_get_uint64 (value);
219 gst_tracer_record_log (tr_element_latency, element_id, element_name, pad_name,
220 GST_CLOCK_DIFF (src_ts, sink_ts), sink_ts);
223 g_free (element_name);
228 send_latency_probe (GstLatencyTracer * self, GstElement * parent, GstPad * pad,
231 GstPad *peer_pad = GST_PAD_PEER (pad);
232 GstElement *peer_parent = get_real_pad_parent (peer_pad);
234 /* allow for non-parented pads to send latency probes as used in e.g.
235 * rtspsrc for TCP connections */
236 if (peer_pad && (!parent || (!GST_IS_BIN (parent)))) {
237 gchar *pad_name, *element_name, *element_id;
238 GstEvent *latency_probe;
240 if (self->flags & GST_LATENCY_TRACER_FLAG_PIPELINE &&
241 GST_OBJECT_FLAG_IS_SET (parent, GST_ELEMENT_FLAG_SOURCE)) {
242 element_id = g_strdup_printf ("%p", parent);
243 element_name = gst_element_get_name (parent);
244 pad_name = gst_pad_get_name (pad);
246 GST_DEBUG ("%s: Sending latency event", pad_name);
248 latency_probe = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
249 gst_structure_new_id (latency_probe_id,
250 latency_probe_element_id, G_TYPE_STRING, element_id,
251 latency_probe_element, G_TYPE_STRING, element_name,
252 latency_probe_pad, G_TYPE_STRING, pad_name,
253 latency_probe_ts, G_TYPE_UINT64, ts, NULL));
255 g_free (element_name);
257 gst_pad_push_event (pad, latency_probe);
260 if (self->flags & GST_LATENCY_TRACER_FLAG_ELEMENT) {
261 GST_DEBUG ("%s_%s: Sending sub-latency event", GST_DEBUG_PAD_NAME (pad));
263 element_id = g_strdup_printf ("%p", peer_parent);
264 element_name = gst_element_get_name (peer_parent);
265 pad_name = gst_pad_get_name (peer_pad);
266 latency_probe = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
267 gst_structure_new_id (sub_latency_probe_id,
268 latency_probe_element_id, G_TYPE_STRING, element_id,
269 latency_probe_element, G_TYPE_STRING, element_name,
270 latency_probe_pad, G_TYPE_STRING, pad_name,
271 latency_probe_ts, G_TYPE_UINT64, ts, NULL));
272 gst_pad_push_event (pad, latency_probe);
274 g_free (element_name);
281 calculate_latency (GstElement * parent, GstPad * pad, guint64 ts)
283 GstElement *peer_parent = get_real_pad_parent (GST_PAD_PEER (pad));
285 if (parent && (!GST_IS_BIN (parent)) &&
286 (!GST_OBJECT_FLAG_IS_SET (parent, GST_ELEMENT_FLAG_SOURCE))) {
289 /* FIXME unsafe use of peer */
290 if (GST_OBJECT_FLAG_IS_SET (peer_parent, GST_ELEMENT_FLAG_SINK)) {
291 GST_DEBUG ("%s_%s: Should log full lantency now",
292 GST_DEBUG_PAD_NAME (pad));
293 ev = g_object_get_qdata ((GObject *) pad, latency_probe_id);
295 g_object_set_qdata ((GObject *) pad, latency_probe_id, NULL);
296 log_latency (gst_event_get_structure (ev), peer_parent,
297 GST_PAD_PEER (pad), ts);
298 gst_event_unref (ev);
302 GST_DEBUG ("%s_%s: Should log sub lantency now", GST_DEBUG_PAD_NAME (pad));
303 ev = g_object_get_qdata ((GObject *) pad, sub_latency_probe_id);
305 g_object_set_qdata ((GObject *) pad, sub_latency_probe_id, NULL);
306 log_element_latency (gst_event_get_structure (ev), parent, pad, ts);
307 gst_event_unref (ev);
313 do_push_buffer_pre (GstTracer * tracer, guint64 ts, GstPad * pad)
315 GstLatencyTracer *self = (GstLatencyTracer *) tracer;
316 GstElement *parent = get_real_pad_parent (pad);
318 send_latency_probe (self, parent, pad, ts);
319 calculate_latency (parent, pad, ts);
323 do_pull_range_pre (GstTracer * tracer, guint64 ts, GstPad * pad)
325 GstLatencyTracer *self = (GstLatencyTracer *) tracer;
326 GstPad *peer_pad = GST_PAD_PEER (pad);
327 GstElement *parent = get_real_pad_parent (peer_pad);
329 send_latency_probe (self, parent, peer_pad, ts);
333 do_pull_range_post (GstTracer * self, guint64 ts, GstPad * pad)
335 GstElement *parent = get_real_pad_parent (pad);
337 calculate_latency (parent, pad, ts);
340 static GstPadProbeReturn
341 do_drop_sub_latency_event (GstPad * pad, GstPadProbeInfo * info,
344 GstEvent *ev = info->data;
345 GstPadProbeReturn ret = GST_PAD_PROBE_OK;
347 if (GST_EVENT_TYPE (ev) == GST_EVENT_CUSTOM_DOWNSTREAM) {
348 const GstStructure *data = gst_event_get_structure (ev);
350 if (gst_structure_get_name_id (data) == sub_latency_probe_id) {
351 /* FIXME unsafe peer pad usage */
352 GstPad *peer_pad = GST_PAD_PEER (pad);
353 GstElement *peer_parent = get_real_pad_parent (peer_pad);
355 gchar *element_id = g_strdup_printf ("%p", peer_parent);
356 gchar *element_name = gst_element_get_name (peer_parent);
357 gchar *pad_name = gst_pad_get_name (peer_pad);
358 const gchar *value_element_id, *value_element_name, *value_pad_name;
360 /* Get the element id, element name and pad name from data */
361 value = gst_structure_id_get_value (data, latency_probe_element_id);
362 value_element_id = g_value_get_string (value);
363 value = gst_structure_id_get_value (data, latency_probe_element);
364 value_element_name = g_value_get_string (value);
365 value = gst_structure_id_get_value (data, latency_probe_pad);
366 value_pad_name = g_value_get_string (value);
368 if (!g_str_equal (value_element_id, element_id) ||
369 !g_str_equal (value_element_name, element_name) ||
370 !g_str_equal (value_pad_name, pad_name)) {
371 GST_DEBUG ("%s_%s: Dropping sub-latency event",
372 GST_DEBUG_PAD_NAME (pad));
373 ret = GST_PAD_PROBE_DROP;
377 g_free (element_name);
386 do_push_event_pre (GstTracer * self, guint64 ts, GstPad * pad, GstEvent * ev)
388 GstElement *parent = get_real_pad_parent (pad);
389 GstPad *peer_pad = GST_PAD_PEER (pad);
390 GstElement *peer_parent = get_real_pad_parent (peer_pad);
392 if (parent && (!GST_IS_BIN (parent)) &&
393 (!GST_OBJECT_FLAG_IS_SET (parent, GST_ELEMENT_FLAG_SOURCE)) &&
394 GST_EVENT_TYPE (ev) == GST_EVENT_CUSTOM_DOWNSTREAM) {
395 const GstStructure *data = gst_event_get_structure (ev);
397 /* if not set yet, add a pad probe that prevents sub-latency event from
399 if (gst_structure_get_name_id (data) == latency_probe_id) {
401 if (!g_object_get_qdata ((GObject *) pad, drop_sub_latency_quark)) {
402 GST_DEBUG ("%s_%s: Adding pad probe to drop sub-latency event",
403 GST_DEBUG_PAD_NAME (pad));
404 gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
405 do_drop_sub_latency_event, NULL, NULL);
406 g_object_set_qdata ((GObject *) pad, drop_sub_latency_quark,
410 /* FIXME unsafe peer access */
411 if (GST_OBJECT_FLAG_IS_SET (peer_parent, GST_ELEMENT_FLAG_SINK)) {
412 GST_DEBUG ("%s_%s: Storing latency event", GST_DEBUG_PAD_NAME (pad));
414 /* store event so that we can calculate latency when the buffer that
415 * follows has been processed */
416 if (!g_object_get_qdata ((GObject *) pad, latency_probe_id))
417 g_object_set_qdata ((GObject *) pad, latency_probe_id,
422 if (gst_structure_get_name_id (data) == sub_latency_probe_id) {
424 gchar *element_id = g_strdup_printf ("%p", peer_parent);
425 gchar *element_name = gst_element_get_name (peer_parent);
426 gchar *pad_name = gst_pad_get_name (peer_pad);
427 const gchar *value_element_id, *value_element_name, *value_pad_name;
429 /* Get the element id, element name and pad name from data */
430 value = gst_structure_id_get_value (data, latency_probe_element_id);
431 value_element_id = g_value_get_string (value);
432 value = gst_structure_id_get_value (data, latency_probe_element);
433 value_element_name = g_value_get_string (value);
434 value = gst_structure_id_get_value (data, latency_probe_pad);
435 value_pad_name = g_value_get_string (value);
437 if (!g_str_equal (value_element_id, element_id) ||
438 !g_str_equal (value_element_name, element_name) ||
439 !g_str_equal (value_pad_name, pad_name)) {
440 GST_DEBUG ("%s_%s: Storing latency event", GST_DEBUG_PAD_NAME (pad));
442 if (!g_object_get_qdata ((GObject *) pad, sub_latency_probe_id))
443 g_object_set_qdata ((GObject *) pad, sub_latency_probe_id,
448 g_free (element_name);
455 do_query_post (GstLatencyTracer * tracer, GstClockTime ts, GstPad * pad,
456 GstQuery * query, gboolean res)
458 /* Only check for latency queries if flag is enabled */
459 if ((tracer->flags & GST_LATENCY_TRACER_FLAG_REPORTED_ELEMENT) &&
460 (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY)) {
462 guint64 min = 0, max = 0, min_prev = 0, max_prev = 0;
463 gchar *element_name, *element_id;
464 struct LatencyQueryTableValue *value;
465 GstElement *element = get_real_pad_parent (pad);
466 GstElement *peer_element = get_real_pad_parent (GST_PAD_PEER (pad));
468 /* Parse the query */
469 gst_query_parse_latency (query, &live, &min, &max);
472 value = local_latency_query_stack_pop ();
473 while (value && value->peer_element == element) {
474 min_prev = MAX (value->min, min_prev);
475 max_prev = MAX (value->max, max_prev);
476 value = local_latency_query_stack_pop ();
480 value = g_new0 (struct LatencyQueryTableValue, 1);
481 value->peer_element = gst_object_ref (peer_element);
484 local_latency_query_stack_push (value);
486 /* Get the pad name */
487 element_id = g_strdup_printf ("%p", element);
488 element_name = gst_element_get_name (element);
490 /* Log reported latency */
491 gst_tracer_record_log (tr_element_reported_latency, element_id,
492 element_name, live, GST_CLOCK_DIFF (min_prev, min),
493 GST_CLOCK_DIFF (max_prev, max), ts);
496 g_free (element_name);
504 gst_latency_tracer_constructed (GObject * object)
506 GstLatencyTracer *self = GST_LATENCY_TRACER (object);
508 GstStructure *params_struct = NULL;
510 g_object_get (self, "params", ¶ms, NULL);
515 tmp = g_strdup_printf ("latency,%s", params);
516 params_struct = gst_structure_from_string (tmp, NULL);
519 /* Read the flags if available */
521 const gchar *flags = gst_structure_get_string (params_struct, "flags");
526 GStrv split = g_strsplit (flags, "+", -1);
529 for (i = 0; split[i]; i++) {
530 if (g_str_equal (split[i], "pipeline"))
531 self->flags |= GST_LATENCY_TRACER_FLAG_PIPELINE;
532 else if (g_str_equal (split[i], "element"))
533 self->flags |= GST_LATENCY_TRACER_FLAG_ELEMENT;
534 else if (g_str_equal (split[i], "reported"))
535 self->flags |= GST_LATENCY_TRACER_FLAG_REPORTED_ELEMENT;
537 GST_WARNING ("Invalid latency tracer flags %s", split[i]);
548 gst_latency_tracer_class_init (GstLatencyTracerClass * klass)
550 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
552 gobject_class->constructed = gst_latency_tracer_constructed;
554 latency_probe_id = g_quark_from_static_string ("latency_probe.id");
555 sub_latency_probe_id = g_quark_from_static_string ("sub_latency_probe.id");
556 latency_probe_pad = g_quark_from_static_string ("latency_probe.pad");
557 latency_probe_element = g_quark_from_static_string ("latency_probe.element");
558 latency_probe_element_id =
559 g_quark_from_static_string ("latency_probe.element_id");
560 latency_probe_ts = g_quark_from_static_string ("latency_probe.ts");
561 drop_sub_latency_quark =
562 g_quark_from_static_string ("drop_sub_latency.quark");
564 /* announce trace formats */
566 tr_latency = gst_tracer_record_new ("latency.class",
567 "src-element-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
568 "type", G_TYPE_GTYPE, G_TYPE_STRING,
569 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
570 GST_TRACER_VALUE_SCOPE_ELEMENT,
572 "src-element", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
573 "type", G_TYPE_GTYPE, G_TYPE_STRING,
574 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
575 GST_TRACER_VALUE_SCOPE_ELEMENT,
577 "src", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
578 "type", G_TYPE_GTYPE, G_TYPE_STRING,
579 "related-to", GST_TYPE_TRACER_VALUE_SCOPE, GST_TRACER_VALUE_SCOPE_PAD,
581 "sink-element-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
582 "type", G_TYPE_GTYPE, G_TYPE_STRING,
583 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
584 GST_TRACER_VALUE_SCOPE_ELEMENT,
586 "sink-element", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
587 "type", G_TYPE_GTYPE, G_TYPE_STRING,
588 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
589 GST_TRACER_VALUE_SCOPE_ELEMENT,
591 "sink", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
592 "type", G_TYPE_GTYPE, G_TYPE_STRING,
593 "related-to", GST_TYPE_TRACER_VALUE_SCOPE, GST_TRACER_VALUE_SCOPE_PAD,
595 "time", GST_TYPE_STRUCTURE, gst_structure_new ("value",
596 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
597 "description", G_TYPE_STRING,
598 "time it took for the buffer to go from src to sink ns",
599 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
600 "max", G_TYPE_UINT64, G_MAXUINT64,
602 "ts", GST_TYPE_STRUCTURE, gst_structure_new ("value",
603 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
604 "description", G_TYPE_STRING, "ts when the latency has been logged",
605 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
606 "max", G_TYPE_UINT64, G_MAXUINT64,
610 tr_element_latency = gst_tracer_record_new ("element-latency.class",
611 "element-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
612 "type", G_TYPE_GTYPE, G_TYPE_STRING,
613 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
614 GST_TRACER_VALUE_SCOPE_ELEMENT,
616 "element", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
617 "type", G_TYPE_GTYPE, G_TYPE_STRING,
618 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
619 GST_TRACER_VALUE_SCOPE_ELEMENT,
621 "src", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
622 "type", G_TYPE_GTYPE, G_TYPE_STRING,
623 "related-to", GST_TYPE_TRACER_VALUE_SCOPE, GST_TRACER_VALUE_SCOPE_PAD,
625 "time", GST_TYPE_STRUCTURE, gst_structure_new ("value",
626 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
627 "description", G_TYPE_STRING,
628 "time it took for the buffer to go from src to sink ns",
629 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
630 "max", G_TYPE_UINT64, G_MAXUINT64,
632 "ts", GST_TYPE_STRUCTURE, gst_structure_new ("value",
633 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
634 "description", G_TYPE_STRING, "ts when the latency has been logged",
635 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
636 "max", G_TYPE_UINT64, G_MAXUINT64,
641 tr_element_reported_latency = gst_tracer_record_new (
642 "element-reported-latency.class",
643 "element-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
644 "type", G_TYPE_GTYPE, G_TYPE_STRING,
645 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
646 GST_TRACER_VALUE_SCOPE_ELEMENT,
648 "element", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
649 "type", G_TYPE_GTYPE, G_TYPE_STRING,
650 "related-to", GST_TYPE_TRACER_VALUE_SCOPE,
651 GST_TRACER_VALUE_SCOPE_ELEMENT,
653 "live", GST_TYPE_STRUCTURE, gst_structure_new ("value",
654 "type", G_TYPE_GTYPE, G_TYPE_BOOLEAN,
655 "description", G_TYPE_STRING,
656 "wether the it is a live stream or not",
658 "min", GST_TYPE_STRUCTURE, gst_structure_new ("value",
659 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
660 "description", G_TYPE_STRING,
661 "the minimum reported latency",
662 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
663 "max", G_TYPE_UINT64, G_MAXUINT64,
665 "max", GST_TYPE_STRUCTURE, gst_structure_new ("value",
666 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
667 "description", G_TYPE_STRING, "the maximum reported latency",
668 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
669 "max", G_TYPE_UINT64, G_MAXUINT64,
671 "ts", GST_TYPE_STRUCTURE, gst_structure_new ("value",
672 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
673 "description", G_TYPE_STRING, "ts when the latency has been reported",
674 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
675 "max", G_TYPE_UINT64, G_MAXUINT64,
682 gst_latency_tracer_init (GstLatencyTracer * self)
684 GstTracer *tracer = GST_TRACER (self);
686 /* only trace pipeline latency by default */
687 self->flags = GST_LATENCY_TRACER_FLAG_PIPELINE;
689 /* in push mode, pre/post will be called before/after the peer chain
690 * function has been called. For this reaosn, we only use -pre to avoid
691 * accounting for the processing time of the peer element (the sink) */
692 gst_tracing_register_hook (tracer, "pad-push-pre",
693 G_CALLBACK (do_push_buffer_pre));
694 gst_tracing_register_hook (tracer, "pad-push-list-pre",
695 G_CALLBACK (do_push_buffer_pre));
697 /* while in pull mode, pre/post will happen before and after the upstream
698 * pull_range call is made, so it already only account for the upstream
699 * processing time. As a side effect, in pull mode, we can measure the
700 * source processing latency, while in push mode, we can't */
701 gst_tracing_register_hook (tracer, "pad-pull-range-pre",
702 G_CALLBACK (do_pull_range_pre));
703 gst_tracing_register_hook (tracer, "pad-pull-range-post",
704 G_CALLBACK (do_pull_range_post));
706 gst_tracing_register_hook (tracer, "pad-push-event-pre",
707 G_CALLBACK (do_push_event_pre));
709 /* Add pad query post hook to get the reported per-element latency */
710 gst_tracing_register_hook (tracer, "pad-query-post",
711 G_CALLBACK (do_query_post));