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gstreamer/plugins/elements/gstidentity.c
Mathieu Duponchelle d46e902273 identity, clocksync: implement provide_clock 
Since those are using the clock for sync, they need to also
provide a clock for good measure. The reason is that even if
downstream elements provide a clock, we don't want to have
that clock selected because it might not be running yet.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/509>
2020-06-05 11:28:12 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
*
* gstidentity.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-identity
* @title: identity
*
* Dummy element that passes incoming data through unmodified. It has some
* useful diagnostic functions, such as offset and timestamp checking.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "gstelements_private.h"
#include "../../gst/gst-i18n-lib.h"
#include "gstidentity.h"
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_identity_debug);
#define GST_CAT_DEFAULT gst_identity_debug
/* Identity signals and args */
enum
{
SIGNAL_HANDOFF,
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_SLEEP_TIME 0
#define DEFAULT_DUPLICATE 1
#define DEFAULT_ERROR_AFTER -1
#define DEFAULT_DROP_PROBABILITY 0.0
#define DEFAULT_DROP_BUFFER_FLAGS 0
#define DEFAULT_DATARATE 0
#define DEFAULT_SILENT TRUE
#define DEFAULT_SINGLE_SEGMENT FALSE
#define DEFAULT_DUMP FALSE
#define DEFAULT_SYNC FALSE
#define DEFAULT_CHECK_IMPERFECT_TIMESTAMP FALSE
#define DEFAULT_CHECK_IMPERFECT_OFFSET FALSE
#define DEFAULT_SIGNAL_HANDOFFS TRUE
#define DEFAULT_TS_OFFSET 0
#define DEFAULT_DROP_ALLOCATION FALSE
#define DEFAULT_EOS_AFTER -1
enum
{
PROP_0,
PROP_SLEEP_TIME,
PROP_ERROR_AFTER,
PROP_DROP_PROBABILITY,
PROP_DROP_BUFFER_FLAGS,
PROP_DATARATE,
PROP_SILENT,
PROP_SINGLE_SEGMENT,
PROP_LAST_MESSAGE,
PROP_DUMP,
PROP_SYNC,
PROP_TS_OFFSET,
PROP_CHECK_IMPERFECT_TIMESTAMP,
PROP_CHECK_IMPERFECT_OFFSET,
PROP_SIGNAL_HANDOFFS,
PROP_DROP_ALLOCATION,
PROP_EOS_AFTER
};
#define _do_init \
GST_DEBUG_CATEGORY_INIT (gst_identity_debug, "identity", 0, "identity element");
#define gst_identity_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstIdentity, gst_identity, GST_TYPE_BASE_TRANSFORM,
_do_init);
static void gst_identity_finalize (GObject * object);
static void gst_identity_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_identity_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_identity_sink_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_identity_src_event (GstBaseTransform * trans,
GstEvent * event);
static GstFlowReturn gst_identity_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
static gboolean gst_identity_start (GstBaseTransform * trans);
static gboolean gst_identity_stop (GstBaseTransform * trans);
static GstStateChangeReturn gst_identity_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_identity_accept_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_identity_query (GstBaseTransform * base,
GstPadDirection direction, GstQuery * query);
static GstClock *gst_identity_provide_clock (GstElement * element);
static guint gst_identity_signals[LAST_SIGNAL] = { 0 };
static GParamSpec *pspec_last_message = NULL;
static void
gst_identity_finalize (GObject * object)
{
GstIdentity *identity;
identity = GST_IDENTITY (object);
g_free (identity->last_message);
g_cond_clear (&identity->blocked_cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_identity_class_init (GstIdentityClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseTransformClass *gstbasetrans_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
gobject_class->set_property = gst_identity_set_property;
gobject_class->get_property = gst_identity_get_property;
g_object_class_install_property (gobject_class, PROP_SLEEP_TIME,
g_param_spec_uint ("sleep-time", "Sleep time",
"Microseconds to sleep between processing", 0, G_MAXUINT,
DEFAULT_SLEEP_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ERROR_AFTER,
g_param_spec_int ("error-after", "Error After", "Error after N buffers",
-1, G_MAXINT, DEFAULT_ERROR_AFTER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DROP_PROBABILITY,
g_param_spec_float ("drop-probability", "Drop Probability",
"The Probability a buffer is dropped", 0.0, 1.0,
DEFAULT_DROP_PROBABILITY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstIdentity:drop-buffer-flags:
*
* Drop buffers with the given flags.
*
* Since: 1.8
**/
g_object_class_install_property (gobject_class, PROP_DROP_BUFFER_FLAGS,
g_param_spec_flags ("drop-buffer-flags", "Check flags to drop buffers",
"Drop buffers with the given flags",
GST_TYPE_BUFFER_FLAGS, DEFAULT_DROP_BUFFER_FLAGS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DATARATE,
g_param_spec_int ("datarate", "Datarate",
"(Re)timestamps buffers with number of bytes per second (0 = inactive)",
0, G_MAXINT, DEFAULT_DATARATE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SILENT,
g_param_spec_boolean ("silent", "silent", "silent", DEFAULT_SILENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SINGLE_SEGMENT,
g_param_spec_boolean ("single-segment", "Single Segment",
"Timestamp buffers and eat segments so as to appear as one segment",
DEFAULT_SINGLE_SEGMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
pspec_last_message = g_param_spec_string ("last-message", "last-message",
"last-message", NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
g_object_class_install_property (gobject_class, PROP_LAST_MESSAGE,
pspec_last_message);
g_object_class_install_property (gobject_class, PROP_DUMP,
g_param_spec_boolean ("dump", "Dump", "Dump buffer contents to stdout",
DEFAULT_DUMP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SYNC,
g_param_spec_boolean ("sync", "Synchronize",
"Synchronize to pipeline clock", DEFAULT_SYNC,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
g_param_spec_int64 ("ts-offset", "Timestamp offset for synchronisation",
"Timestamp offset in nanoseconds for synchronisation, negative for earlier sync",
G_MININT64, G_MAXINT64, DEFAULT_TS_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_CHECK_IMPERFECT_TIMESTAMP,
g_param_spec_boolean ("check-imperfect-timestamp",
"Check for discontiguous timestamps",
"Send element messages if timestamps and durations do not match up",
DEFAULT_CHECK_IMPERFECT_TIMESTAMP,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CHECK_IMPERFECT_OFFSET,
g_param_spec_boolean ("check-imperfect-offset",
"Check for discontiguous offset",
"Send element messages if offset and offset_end do not match up",
DEFAULT_CHECK_IMPERFECT_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstIdentity:signal-handoffs
*
* If set to %TRUE, the identity will emit a handoff signal when handling a buffer.
* When set to %FALSE, no signal will be emitted, which might improve performance.
*/
g_object_class_install_property (gobject_class, PROP_SIGNAL_HANDOFFS,
g_param_spec_boolean ("signal-handoffs",
"Signal handoffs", "Send a signal before pushing the buffer",
DEFAULT_SIGNAL_HANDOFFS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DROP_ALLOCATION,
g_param_spec_boolean ("drop-allocation", "Drop allocation query",
"Don't forward allocation queries", DEFAULT_DROP_ALLOCATION,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstIdentity:eos-after
*
* EOS after N buffers.
*
* Since: 1.16
**/
g_object_class_install_property (gobject_class, PROP_EOS_AFTER,
g_param_spec_int ("eos-after", "EOS After", "EOS after N buffers",
-1, G_MAXINT, DEFAULT_EOS_AFTER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstIdentity::handoff:
* @identity: the identity instance
* @buffer: the buffer that just has been received
* @pad: the pad that received it
*
* This signal gets emitted before passing the buffer downstream.
*/
gst_identity_signals[SIGNAL_HANDOFF] =
g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstIdentityClass, handoff), NULL, NULL,
NULL, G_TYPE_NONE, 1, GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE);
gobject_class->finalize = gst_identity_finalize;
gst_element_class_set_static_metadata (gstelement_class,
"Identity",
"Generic",
"Pass data without modification", "Erik Walthinsen <omega@cse.ogi.edu>");
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_identity_change_state);
gstelement_class->provide_clock =
GST_DEBUG_FUNCPTR (gst_identity_provide_clock);
gstbasetrans_class->sink_event = GST_DEBUG_FUNCPTR (gst_identity_sink_event);
gstbasetrans_class->src_event = GST_DEBUG_FUNCPTR (gst_identity_src_event);
gstbasetrans_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_identity_transform_ip);
gstbasetrans_class->start = GST_DEBUG_FUNCPTR (gst_identity_start);
gstbasetrans_class->stop = GST_DEBUG_FUNCPTR (gst_identity_stop);
gstbasetrans_class->accept_caps =
GST_DEBUG_FUNCPTR (gst_identity_accept_caps);
gstbasetrans_class->query = gst_identity_query;
}
static void
gst_identity_init (GstIdentity * identity)
{
identity->sleep_time = DEFAULT_SLEEP_TIME;
identity->error_after = DEFAULT_ERROR_AFTER;
identity->error_after_counter = DEFAULT_ERROR_AFTER;
identity->drop_probability = DEFAULT_DROP_PROBABILITY;
identity->drop_buffer_flags = DEFAULT_DROP_BUFFER_FLAGS;
identity->datarate = DEFAULT_DATARATE;
identity->silent = DEFAULT_SILENT;
identity->single_segment = DEFAULT_SINGLE_SEGMENT;
identity->sync = DEFAULT_SYNC;
identity->check_imperfect_timestamp = DEFAULT_CHECK_IMPERFECT_TIMESTAMP;
identity->check_imperfect_offset = DEFAULT_CHECK_IMPERFECT_OFFSET;
identity->dump = DEFAULT_DUMP;
identity->last_message = NULL;
identity->signal_handoffs = DEFAULT_SIGNAL_HANDOFFS;
identity->ts_offset = DEFAULT_TS_OFFSET;
g_cond_init (&identity->blocked_cond);
identity->eos_after = DEFAULT_EOS_AFTER;
identity->eos_after_counter = DEFAULT_EOS_AFTER;
gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM_CAST (identity), TRUE);
GST_OBJECT_FLAG_SET (identity, GST_ELEMENT_FLAG_PROVIDE_CLOCK);
GST_OBJECT_FLAG_SET (identity, GST_ELEMENT_FLAG_REQUIRE_CLOCK);
}
static void
gst_identity_notify_last_message (GstIdentity * identity)
{
g_object_notify_by_pspec ((GObject *) identity, pspec_last_message);
}
static GstFlowReturn
gst_identity_do_sync (GstIdentity * identity, GstClockTime running_time)
{
GstFlowReturn ret = GST_FLOW_OK;
if (identity->sync &&
GST_BASE_TRANSFORM_CAST (identity)->segment.format == GST_FORMAT_TIME) {
GstClock *clock;
GST_OBJECT_LOCK (identity);
if (identity->flushing) {
GST_OBJECT_UNLOCK (identity);
return GST_FLOW_FLUSHING;
}
while (identity->blocked && !identity->flushing)
g_cond_wait (&identity->blocked_cond, GST_OBJECT_GET_LOCK (identity));
if (identity->flushing) {
GST_OBJECT_UNLOCK (identity);
return GST_FLOW_FLUSHING;
}
if ((clock = GST_ELEMENT (identity)->clock)) {
GstClockReturn cret;
GstClockTime timestamp;
GstClockTimeDiff ts_offset = identity->ts_offset;
timestamp = running_time + GST_ELEMENT (identity)->base_time +
identity->upstream_latency;
if (ts_offset < 0) {
ts_offset = -ts_offset;
if (ts_offset < timestamp)
timestamp -= ts_offset;
else
timestamp = 0;
} else
timestamp += ts_offset;
/* save id if we need to unlock */
identity->clock_id = gst_clock_new_single_shot_id (clock, timestamp);
GST_OBJECT_UNLOCK (identity);
cret = gst_clock_id_wait (identity->clock_id, NULL);
GST_OBJECT_LOCK (identity);
if (identity->clock_id) {
gst_clock_id_unref (identity->clock_id);
identity->clock_id = NULL;
}
if (cret == GST_CLOCK_UNSCHEDULED || identity->flushing)
ret = GST_FLOW_FLUSHING;
}
GST_OBJECT_UNLOCK (identity);
}
return ret;
}
static gboolean
gst_identity_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstIdentity *identity;
gboolean ret = TRUE;
identity = GST_IDENTITY (trans);
if (!identity->silent) {
const GstStructure *s;
const gchar *tstr;
gchar *sstr;
GST_OBJECT_LOCK (identity);
g_free (identity->last_message);
tstr = gst_event_type_get_name (GST_EVENT_TYPE (event));
if ((s = gst_event_get_structure (event)))
sstr = gst_structure_to_string (s);
else
sstr = g_strdup ("");
identity->last_message =
g_strdup_printf ("event ******* (%s:%s) E (type: %s (%d), %s) %p",
GST_DEBUG_PAD_NAME (trans->sinkpad), tstr, GST_EVENT_TYPE (event),
sstr, event);
g_free (sstr);
GST_OBJECT_UNLOCK (identity);
gst_identity_notify_last_message (identity);
}
if (identity->single_segment && (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
if (!trans->have_segment) {
GstEvent *news;
GstSegment segment;
gst_event_copy_segment (event, &segment);
gst_event_copy_segment (event, &trans->segment);
trans->have_segment = TRUE;
/* This is the first segment, send out a (0, -1) segment */
gst_segment_init (&segment, segment.format);
if (identity->seek_segment.format != GST_FORMAT_UNDEFINED) {
segment.time = identity->seek_segment.time;
segment.base = identity->seek_segment.base;
gst_segment_init (&identity->seek_segment, GST_FORMAT_UNDEFINED);
}
news = gst_event_new_segment (&segment);
GST_EVENT_SEQNUM (news) = GST_EVENT_SEQNUM (event);
gst_pad_event_default (trans->sinkpad, GST_OBJECT_CAST (trans), news);
} else {
/* need to track segment for proper running time */
gst_event_copy_segment (event, &trans->segment);
}
}
if (GST_EVENT_TYPE (event) == GST_EVENT_GAP &&
trans->have_segment && trans->segment.format == GST_FORMAT_TIME) {
GstClockTime start, dur;
gst_event_parse_gap (event, &start, &dur);
if (GST_CLOCK_TIME_IS_VALID (start)) {
start = gst_segment_to_running_time (&trans->segment,
GST_FORMAT_TIME, start);
gst_identity_do_sync (identity, start);
/* also transform GAP timestamp similar to buffer timestamps */
if (identity->single_segment) {
gst_event_unref (event);
event = gst_event_new_gap (start, dur);
}
}
}
/* Reset previous timestamp, duration and offsets on SEGMENT
* to prevent false warnings when checking for perfect streams */
if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
identity->prev_timestamp = identity->prev_duration = GST_CLOCK_TIME_NONE;
identity->prev_offset = identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
}
if (identity->single_segment && GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
/* eat up segments */
gst_event_unref (event);
ret = TRUE;
goto done;
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_OBJECT_LOCK (identity);
identity->flushing = TRUE;
g_cond_signal (&identity->blocked_cond);
if (identity->clock_id) {
GST_DEBUG_OBJECT (identity, "unlock clock wait");
gst_clock_id_unschedule (identity->clock_id);
}
GST_OBJECT_UNLOCK (identity);
break;
case GST_EVENT_FLUSH_STOP:
GST_OBJECT_LOCK (identity);
identity->flushing = FALSE;
trans->have_segment = FALSE;
GST_OBJECT_UNLOCK (identity);
break;
default:
break;
}
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
done:
return ret;
}
static gboolean
gst_identity_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstIdentity *identity = GST_IDENTITY (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
gdouble rate;
GstFormat fmt;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
&start, &stop_type, &stop);
GST_OBJECT_LOCK (identity);
gst_segment_init (&identity->seek_segment, fmt);
if (!gst_segment_do_seek (&identity->seek_segment, rate, fmt,
flags, start_type, start, stop_type, stop, NULL)) {
GST_WARNING_OBJECT (identity, "Could not run seek %" GST_PTR_FORMAT,
event);
GST_OBJECT_UNLOCK (identity);
return FALSE;
}
GST_OBJECT_UNLOCK (identity);
break;
}
default:
break;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans, event);
}
static void
gst_identity_check_imperfect_timestamp (GstIdentity * identity, GstBuffer * buf)
{
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);
/* invalid timestamp drops us out of check. FIXME: maybe warn ? */
if (timestamp != GST_CLOCK_TIME_NONE) {
/* check if we had a previous buffer to compare to */
if (identity->prev_timestamp != GST_CLOCK_TIME_NONE &&
identity->prev_duration != GST_CLOCK_TIME_NONE) {
GstClockTime t_expected;
GstClockTimeDiff dt;
t_expected = identity->prev_timestamp + identity->prev_duration;
dt = GST_CLOCK_DIFF (t_expected, timestamp);
if (dt != 0) {
/*
* "imperfect-timestamp" bus message:
* @identity: the identity instance
* @delta: the GST_CLOCK_DIFF to the prev timestamp
* @prev-timestamp: the previous buffer timestamp
* @prev-duration: the previous buffer duration
* @prev-offset: the previous buffer offset
* @prev-offset-end: the previous buffer offset end
* @cur-timestamp: the current buffer timestamp
* @cur-duration: the current buffer duration
* @cur-offset: the current buffer offset
* @cur-offset-end: the current buffer offset end
*
* This bus message gets emitted if the check-imperfect-timestamp
* property is set and there is a gap in time between the
* last buffer and the newly received buffer.
*/
gst_element_post_message (GST_ELEMENT (identity),
gst_message_new_element (GST_OBJECT (identity),
gst_structure_new ("imperfect-timestamp",
"delta", G_TYPE_INT64, dt,
"prev-timestamp", G_TYPE_UINT64,
identity->prev_timestamp, "prev-duration", G_TYPE_UINT64,
identity->prev_duration, "prev-offset", G_TYPE_UINT64,
identity->prev_offset, "prev-offset-end", G_TYPE_UINT64,
identity->prev_offset_end, "cur-timestamp", G_TYPE_UINT64,
timestamp, "cur-duration", G_TYPE_UINT64,
GST_BUFFER_DURATION (buf), "cur-offset", G_TYPE_UINT64,
GST_BUFFER_OFFSET (buf), "cur-offset-end", G_TYPE_UINT64,
GST_BUFFER_OFFSET_END (buf), NULL)));
}
} else {
GST_DEBUG_OBJECT (identity, "can't check data-contiguity, no "
"offset_end was set on previous buffer");
}
}
}
static void
gst_identity_check_imperfect_offset (GstIdentity * identity, GstBuffer * buf)
{
guint64 offset;
offset = GST_BUFFER_OFFSET (buf);
if (identity->prev_offset_end != offset &&
identity->prev_offset_end != GST_BUFFER_OFFSET_NONE &&
offset != GST_BUFFER_OFFSET_NONE) {
/*
* "imperfect-offset" bus message:
* @identity: the identity instance
* @prev-timestamp: the previous buffer timestamp
* @prev-duration: the previous buffer duration
* @prev-offset: the previous buffer offset
* @prev-offset-end: the previous buffer offset end
* @cur-timestamp: the current buffer timestamp
* @cur-duration: the current buffer duration
* @cur-offset: the current buffer offset
* @cur-offset-end: the current buffer offset end
*
* This bus message gets emitted if the check-imperfect-offset
* property is set and there is a gap in offsets between the
* last buffer and the newly received buffer.
*/
gst_element_post_message (GST_ELEMENT (identity),
gst_message_new_element (GST_OBJECT (identity),
gst_structure_new ("imperfect-offset", "prev-timestamp",
G_TYPE_UINT64, identity->prev_timestamp, "prev-duration",
G_TYPE_UINT64, identity->prev_duration, "prev-offset",
G_TYPE_UINT64, identity->prev_offset, "prev-offset-end",
G_TYPE_UINT64, identity->prev_offset_end, "cur-timestamp",
G_TYPE_UINT64, GST_BUFFER_TIMESTAMP (buf), "cur-duration",
G_TYPE_UINT64, GST_BUFFER_DURATION (buf), "cur-offset",
G_TYPE_UINT64, GST_BUFFER_OFFSET (buf), "cur-offset-end",
G_TYPE_UINT64, GST_BUFFER_OFFSET_END (buf), NULL)));
} else {
GST_DEBUG_OBJECT (identity, "can't check offset contiguity, no offset "
"and/or offset_end were set on previous buffer");
}
}
static const gchar *
print_pretty_time (gchar * ts_str, gsize ts_str_len, GstClockTime ts)
{
if (ts == GST_CLOCK_TIME_NONE)
return "none";
g_snprintf (ts_str, ts_str_len, "%" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
return ts_str;
}
static void
gst_identity_update_last_message_for_buffer (GstIdentity * identity,
const gchar * action, GstBuffer * buf, gsize size)
{
gchar dts_str[64], pts_str[64], dur_str[64];
gchar *flag_str, *meta_str;
GST_OBJECT_LOCK (identity);
flag_str = gst_buffer_get_flags_string (buf);
meta_str = gst_buffer_get_meta_string (buf);
g_free (identity->last_message);
identity->last_message = g_strdup_printf ("%s ******* (%s:%s) "
"(%" G_GSIZE_FORMAT " bytes, dts: %s, pts: %s, duration: %s, offset: %"
G_GINT64_FORMAT ", " "offset_end: % " G_GINT64_FORMAT
", flags: %08x %s, meta: %s) %p", action,
GST_DEBUG_PAD_NAME (GST_BASE_TRANSFORM_CAST (identity)->sinkpad), size,
print_pretty_time (dts_str, sizeof (dts_str), GST_BUFFER_DTS (buf)),
print_pretty_time (pts_str, sizeof (pts_str), GST_BUFFER_PTS (buf)),
print_pretty_time (dur_str, sizeof (dur_str), GST_BUFFER_DURATION (buf)),
GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf),
GST_BUFFER_FLAGS (buf), flag_str, meta_str ? meta_str : "none", buf);
g_free (flag_str);
g_free (meta_str);
GST_OBJECT_UNLOCK (identity);
gst_identity_notify_last_message (identity);
}
static GstFlowReturn
gst_identity_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstIdentity *identity = GST_IDENTITY (trans);
GstClockTime rundts = GST_CLOCK_TIME_NONE;
GstClockTime runpts = GST_CLOCK_TIME_NONE;
GstClockTime ts, duration, runtimestamp;
gsize size;
size = gst_buffer_get_size (buf);
if (identity->check_imperfect_timestamp)
gst_identity_check_imperfect_timestamp (identity, buf);
if (identity->check_imperfect_offset)
gst_identity_check_imperfect_offset (identity, buf);
/* update prev values */
identity->prev_timestamp = GST_BUFFER_TIMESTAMP (buf);
identity->prev_duration = GST_BUFFER_DURATION (buf);
identity->prev_offset_end = GST_BUFFER_OFFSET_END (buf);
identity->prev_offset = GST_BUFFER_OFFSET (buf);
if (identity->error_after_counter >= 0) {
identity->error_after_counter--;
if (identity->error_after_counter == 0)
goto error_after;
}
if (identity->eos_after_counter >= 0) {
identity->eos_after_counter--;
if (identity->eos_after_counter == 0)
goto eos_after;
}
if (identity->drop_probability > 0.0) {
if ((gfloat) (1.0 * rand () / (RAND_MAX)) < identity->drop_probability)
goto dropped;
}
if (GST_BUFFER_FLAG_IS_SET (buf, identity->drop_buffer_flags))
goto dropped;
if (identity->dump) {
GstMapInfo info;
if (gst_buffer_map (buf, &info, GST_MAP_READ)) {
gst_util_dump_mem (info.data, info.size);
gst_buffer_unmap (buf, &info);
}
}
if (!identity->silent) {
gst_identity_update_last_message_for_buffer (identity, "chain", buf, size);
}
if (identity->datarate > 0) {
GstClockTime time = gst_util_uint64_scale_int (identity->offset,
GST_SECOND, identity->datarate);
GST_BUFFER_PTS (buf) = GST_BUFFER_DTS (buf) = time;
GST_BUFFER_DURATION (buf) = size * GST_SECOND / identity->datarate;
}
if (identity->signal_handoffs)
g_signal_emit (identity, gst_identity_signals[SIGNAL_HANDOFF], 0, buf);
if (trans->segment.format == GST_FORMAT_TIME) {
if (trans->segment.rate > 0) {
runpts = gst_segment_to_running_time (&trans->segment,
GST_FORMAT_TIME, GST_BUFFER_PTS (buf));
rundts = gst_segment_to_running_time (&trans->segment,
GST_FORMAT_TIME, GST_BUFFER_DTS (buf));
} else {
runpts = gst_segment_to_running_time (&trans->segment,
GST_FORMAT_TIME, GST_CLOCK_TIME_IS_VALID (buf->duration)
&& GST_CLOCK_TIME_IS_VALID (buf->pts) ? buf->pts +
buf->duration : buf->pts);
rundts = gst_segment_to_running_time (&trans->segment,
GST_FORMAT_TIME, GST_CLOCK_TIME_IS_VALID (buf->duration)
&& GST_CLOCK_TIME_IS_VALID (buf->dts) ? buf->dts +
buf->duration : buf->dts);
}
}
if (GST_CLOCK_TIME_IS_VALID (rundts))
runtimestamp = rundts;
else if (GST_CLOCK_TIME_IS_VALID (runpts))
runtimestamp = runpts;
else
runtimestamp = 0;
ret = gst_identity_do_sync (identity, runtimestamp);
identity->offset += size;
if (identity->sleep_time && ret == GST_FLOW_OK)
g_usleep (identity->sleep_time);
if (identity->single_segment && (trans->segment.format == GST_FORMAT_TIME)
&& (ret == GST_FLOW_OK)) {
GST_BUFFER_DTS (buf) = rundts;
GST_BUFFER_PTS (buf) = runpts;
GST_BUFFER_OFFSET (buf) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET_END (buf) = GST_CLOCK_TIME_NONE;
}
return ret;
/* ERRORS */
error_after:
{
GST_ELEMENT_ERROR (identity, CORE, FAILED,
(_("Failed after iterations as requested.")), (NULL));
return GST_FLOW_ERROR;
}
eos_after:
{
GST_DEBUG_OBJECT (identity, "EOS after iterations as requested.");
return GST_FLOW_EOS;
}
dropped:
{
if (!identity->silent) {
gst_identity_update_last_message_for_buffer (identity, "dropping", buf,
size);
}
ts = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (ts)) {
duration = GST_BUFFER_DURATION (buf);
gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (identity),
gst_event_new_gap (ts, duration));
}
/* return DROPPED to basetransform. */
return GST_BASE_TRANSFORM_FLOW_DROPPED;
}
}
static void
gst_identity_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstIdentity *identity;
identity = GST_IDENTITY (object);
switch (prop_id) {
case PROP_SLEEP_TIME:
identity->sleep_time = g_value_get_uint (value);
break;
case PROP_SILENT:
identity->silent = g_value_get_boolean (value);
break;
case PROP_SINGLE_SEGMENT:
identity->single_segment = g_value_get_boolean (value);
break;
case PROP_DUMP:
identity->dump = g_value_get_boolean (value);
break;
case PROP_ERROR_AFTER:
identity->error_after = g_value_get_int (value);
break;
case PROP_DROP_PROBABILITY:
identity->drop_probability = g_value_get_float (value);
break;
case PROP_DROP_BUFFER_FLAGS:
identity->drop_buffer_flags = g_value_get_flags (value);
break;
case PROP_DATARATE:
identity->datarate = g_value_get_int (value);
break;
case PROP_SYNC:
identity->sync = g_value_get_boolean (value);
break;
case PROP_TS_OFFSET:
identity->ts_offset = g_value_get_int64 (value);
break;
case PROP_CHECK_IMPERFECT_TIMESTAMP:
identity->check_imperfect_timestamp = g_value_get_boolean (value);
break;
case PROP_CHECK_IMPERFECT_OFFSET:
identity->check_imperfect_offset = g_value_get_boolean (value);
break;
case PROP_SIGNAL_HANDOFFS:
identity->signal_handoffs = g_value_get_boolean (value);
break;
case PROP_DROP_ALLOCATION:
identity->drop_allocation = g_value_get_boolean (value);
break;
case PROP_EOS_AFTER:
identity->eos_after = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
if (identity->datarate > 0 || identity->single_segment)
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), FALSE);
else
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), TRUE);
}
static void
gst_identity_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstIdentity *identity;
identity = GST_IDENTITY (object);
switch (prop_id) {
case PROP_SLEEP_TIME:
g_value_set_uint (value, identity->sleep_time);
break;
case PROP_ERROR_AFTER:
g_value_set_int (value, identity->error_after);
break;
case PROP_DROP_PROBABILITY:
g_value_set_float (value, identity->drop_probability);
break;
case PROP_DROP_BUFFER_FLAGS:
g_value_set_flags (value, identity->drop_buffer_flags);
break;
case PROP_DATARATE:
g_value_set_int (value, identity->datarate);
break;
case PROP_SILENT:
g_value_set_boolean (value, identity->silent);
break;
case PROP_SINGLE_SEGMENT:
g_value_set_boolean (value, identity->single_segment);
break;
case PROP_DUMP:
g_value_set_boolean (value, identity->dump);
break;
case PROP_LAST_MESSAGE:
GST_OBJECT_LOCK (identity);
g_value_set_string (value, identity->last_message);
GST_OBJECT_UNLOCK (identity);
break;
case PROP_SYNC:
g_value_set_boolean (value, identity->sync);
break;
case PROP_TS_OFFSET:
g_value_set_int64 (value, identity->ts_offset);
break;
case PROP_CHECK_IMPERFECT_TIMESTAMP:
g_value_set_boolean (value, identity->check_imperfect_timestamp);
break;
case PROP_CHECK_IMPERFECT_OFFSET:
g_value_set_boolean (value, identity->check_imperfect_offset);
break;
case PROP_SIGNAL_HANDOFFS:
g_value_set_boolean (value, identity->signal_handoffs);
break;
case PROP_DROP_ALLOCATION:
g_value_set_boolean (value, identity->drop_allocation);
break;
case PROP_EOS_AFTER:
g_value_set_int (value, identity->eos_after);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_identity_start (GstBaseTransform * trans)
{
GstIdentity *identity;
identity = GST_IDENTITY (trans);
if (identity->eos_after != DEFAULT_EOS_AFTER
&& identity->error_after != DEFAULT_ERROR_AFTER)
goto both_afters_defined;
identity->offset = 0;
identity->prev_timestamp = GST_CLOCK_TIME_NONE;
identity->prev_duration = GST_CLOCK_TIME_NONE;
identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
identity->prev_offset = GST_BUFFER_OFFSET_NONE;
identity->error_after_counter = identity->error_after;
identity->eos_after_counter = identity->eos_after;
return TRUE;
/* ERROR */
both_afters_defined:
{
GST_ELEMENT_ERROR (identity, CORE, FAILED,
(_("eos-after and error-after can't both be defined.")), (NULL));
return FALSE;
}
}
static gboolean
gst_identity_stop (GstBaseTransform * trans)
{
GstIdentity *identity;
identity = GST_IDENTITY (trans);
GST_OBJECT_LOCK (identity);
g_free (identity->last_message);
identity->last_message = NULL;
GST_OBJECT_UNLOCK (identity);
return TRUE;
}
static gboolean
gst_identity_accept_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps)
{
gboolean ret;
GstPad *pad;
/* Proxy accept-caps */
if (direction == GST_PAD_SRC)
pad = GST_BASE_TRANSFORM_SINK_PAD (base);
else
pad = GST_BASE_TRANSFORM_SRC_PAD (base);
ret = gst_pad_peer_query_accept_caps (pad, caps);
return ret;
}
static gboolean
gst_identity_query (GstBaseTransform * base, GstPadDirection direction,
GstQuery * query)
{
GstIdentity *identity;
gboolean ret;
identity = GST_IDENTITY (base);
if (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION &&
identity->drop_allocation) {
GST_DEBUG_OBJECT (identity, "Dropping allocation query.");
return FALSE;
}
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->query (base, direction, query);
if (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY) {
gboolean live = FALSE;
GstClockTime min = 0, max = 0;
if (ret) {
gst_query_parse_latency (query, &live, &min, &max);
if (identity->sync && max < min) {
GST_ELEMENT_WARNING (base, CORE, CLOCK, (NULL),
("Impossible to configure latency before identity sync=true:"
" max %" GST_TIME_FORMAT " < min %"
GST_TIME_FORMAT ". Add queues or other buffering elements.",
GST_TIME_ARGS (max), GST_TIME_ARGS (min)));
}
}
/* Ignore the upstream latency if it is not live */
GST_OBJECT_LOCK (identity);
if (live)
identity->upstream_latency = min;
else {
identity->upstream_latency = 0;
/* if we interface a non-live source, then we know there is no
* limit in the maximum latency */
max = -1;
}
GST_OBJECT_UNLOCK (identity);
gst_query_set_latency (query, live || identity->sync, min, max);
ret = TRUE;
}
return ret;
}
static GstStateChangeReturn
gst_identity_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstIdentity *identity = GST_IDENTITY (element);
gboolean no_preroll = FALSE;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (identity);
identity->flushing = FALSE;
identity->blocked = TRUE;
GST_OBJECT_UNLOCK (identity);
if (identity->sync)
no_preroll = TRUE;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_OBJECT_LOCK (identity);
identity->blocked = FALSE;
g_cond_signal (&identity->blocked_cond);
GST_OBJECT_UNLOCK (identity);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_OBJECT_LOCK (identity);
identity->flushing = TRUE;
if (identity->clock_id) {
GST_DEBUG_OBJECT (identity, "unlock clock wait");
gst_clock_id_unschedule (identity->clock_id);
}
identity->blocked = FALSE;
g_cond_signal (&identity->blocked_cond);
GST_OBJECT_UNLOCK (identity);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_OBJECT_LOCK (identity);
identity->upstream_latency = 0;
identity->blocked = TRUE;
GST_OBJECT_UNLOCK (identity);
if (identity->sync)
no_preroll = TRUE;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
if (no_preroll && ret == GST_STATE_CHANGE_SUCCESS)
ret = GST_STATE_CHANGE_NO_PREROLL;
return ret;
}
/* FIXME: GStreamer 2.0 */
static GstClock *
gst_identity_provide_clock (GstElement * element)
{
return gst_system_clock_obtain ();
}
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