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gstdtlsrtpenc: Add rtp-sync property

Browse source 
Add an rtp-sync property which synchronises RTP streams
to the pipeline clock before passing them to funnel for
merging with RTCP.

https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/1212
This commit is contained in:
Jan Schmidt 2020-02-14 01:38:14 +11:00 committed by GStreamer Merge Bot
parent a06ddd182d
commit 0c72a41767
2 changed files with 56 additions and 11 deletions
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65
ext/dtls/gstdtlssrtpenc.c
View file

@ -78,12 +78,14 @@ enum
PROP_0,
PROP_IS_CLIENT,
PROP_CONNECTION_STATE,
PROP_RTP_SYNC,
NUM_PROPERTIES
};
static GParamSpec *properties[NUM_PROPERTIES];
#define DEFAULT_IS_CLIENT FALSE
#define DEFAULT_RTP_SYNC FALSE
static gboolean transform_enum (GBinding *, const GValue * source_value,
GValue * target_value, GEnumClass *);
@ -145,6 +147,12 @@ gst_dtls_srtp_enc_class_init (GstDtlsSrtpEncClass * klass)
GST_DTLS_TYPE_CONNECTION_STATE,
GST_DTLS_CONNECTION_STATE_NEW, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
properties[PROP_RTP_SYNC] =
g_param_spec_boolean ("rtp-sync", "Synchronize RTP",
"Synchronize RTP to the pipeline clock before merging with RTCP",
DEFAULT_RTP_SYNC, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
gst_element_class_add_static_pad_template (element_class, &rtp_sink_template);
@ -178,15 +186,20 @@ gst_dtls_srtp_enc_init (GstDtlsSrtpEnc * self)
gboolean ret;
/*
+--------------------+ +-----------------+
rtp_sink-R-o|rtp_sink rtp_src|o-R-o| |
| srtpenc | | |
rtcp_sink-R-o|srtcp_sink rtcp_src|o-R-o| |
+--------------------+ | funnel |o---src
| |
+--------------------+ | |
data_sink-R-o| dtlsenc |o---o| |
+--------------------+ +-----------------+
+--------------------+ +--------------+ +-----------------+
rtp_sink-R-o|rtp_sink rtp_src|o-R-o clocksync |o-R-o| |
| srtpenc | +--------------+ | |
| | | |
rtcp_sink-R-o|srtcp_sink rtcp_src|o-----------R-----------o| |
+--------------------+ | funnel |o---src
| |
+--------------------+ | |
data_sink-R-o| dtlsenc |o-----------------------o| |
+--------------------+ +-----------------+
The clocksync element is tied to the sync property. If sync=true, RTP output will be
synchronised to the clock, so it doesn't slow down RTCP traffic by being synched later
in the pipeline
*/
self->srtp_enc = gst_element_factory_make ("srtpenc", NULL);
@ -289,6 +302,9 @@ gst_dtls_srtp_enc_set_property (GObject * object,
"tried to set is-client after disabling DTLS");
}
break;
case PROP_RTP_SYNC:
self->rtp_sync = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
}
@ -314,6 +330,9 @@ gst_dtls_srtp_enc_get_property (GObject * object,
g_object_get_property (G_OBJECT (self->bin.dtls_element),
"connection-state", value);
break;
case PROP_RTP_SYNC:
g_value_set_boolean (value, self->rtp_sync);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
}
@ -356,13 +375,32 @@ gst_dtls_srtp_enc_request_new_pad (GstElement * element,
g_return_val_if_fail (self->srtp_enc, NULL);
if (templ == gst_element_class_get_pad_template (klass, "rtp_sink_%d")) {
gchar *clocksync_name;
GstElement *clocksync;
sscanf (name, "rtp_sink_%d", &pad_n);
clocksync_name = g_strdup_printf ("clocksync_%d", pad_n);
clocksync = gst_element_factory_make ("clocksync", clocksync_name);
g_free (clocksync_name);
if (clocksync == NULL) {
goto fail_create;
}
g_object_bind_property (self, "rtp-sync", clocksync, "sync",
G_BINDING_SYNC_CREATE);
gst_bin_add (GST_BIN (self), clocksync);
gst_element_sync_state_with_parent (clocksync);
target_pad = gst_element_get_request_pad (self->srtp_enc, name);
g_return_val_if_fail (target_pad, NULL);
sscanf (GST_PAD_NAME (target_pad), "rtp_sink_%d", &pad_n);
srtp_src_name = g_strdup_printf ("rtp_src_%d", pad_n);
gst_element_link_pads (self->srtp_enc, srtp_src_name, self->funnel, NULL);
gst_element_link_pads (self->srtp_enc, srtp_src_name, clocksync, NULL);
gst_element_link_pads (clocksync, "src", self->funnel, NULL);
g_free (srtp_src_name);
@ -400,6 +438,11 @@ gst_dtls_srtp_enc_request_new_pad (GstElement * element,
}
return ghost_pad;
fail_create:
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN, NULL,
("%s", "Failed to create internal clocksync element"));
return NULL;
}
static void

2
ext/dtls/gstdtlssrtpenc.h
View file

@ -44,6 +44,8 @@ typedef struct _GstDtlsSrtpEncClass GstDtlsSrtpEncClass;
struct _GstDtlsSrtpEnc {
GstDtlsSrtpBin bin;
gboolean rtp_sync;
GstElement *srtp_enc;
GstElement *funnel;
};