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rtpmanager: implement SMPTE 2022-1 FEC decoder

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+ improve integration of FEC decoders in rtpbin

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/753>
This commit is contained in:
Mathieu Duponchelle 2020-10-06 03:13:30 +02:00 committed by GStreamer Merge Bot
parent 7c9a5e86fe
commit cff42d4c26
9 changed files with 1843 additions and 8 deletions
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64
docs/gst_plugins_cache.json
View file

@ -16068,6 +16068,11 @@
"klass": "Filter/Network/RTP",
"long-name": "RTP Bin",
"pad-templates": {
"recv_fec_sink_%%u_%%u": {
"caps": "application/x-rtp:\n",
"direction": "sink",
"presence": "request"
},
"recv_rtcp_sink_%%u": {
"caps": "application/x-rtcp:\napplication/x-srtcp:\n",
"direction": "sink",
@ -16172,6 +16177,18 @@
"type": "gboolean",
"writable": true
},
"fec-decoders": {
"blurb": "GstStructure mapping from session index to FEC decoder factory, eg fec-decoders='fec,0=\"rtpst2022-1-fecdec\\ size-time\\=1000000000\";'",
"conditionally-available": false,
"construct": false,
"construct-only": false,
"controllable": false,
"default": "application/x-rtp-fec-decoders;",
"mutable": "null",
"readable": true,
"type": "GstStructure",
"writable": true
},
"ignore-pt": {
"blurb": "Do not demultiplex based on PT values",
"conditionally-available": false,
@ -18227,6 +18244,53 @@
"when": "last"
}
}
},
"rtpst2022-1-fecdec": {
"author": "Mathieu Duponchelle <mathieu@centricular.com>",
"description": "performs FEC as described by SMPTE 2022-1",
"hierarchy": [
"GstRTPST_2022_1_FecDec",
"GstElement",
"GstObject",
"GInitiallyUnowned",
"GObject"
],
"klass": "SMPTE 2022-1 FEC decoding",
"long-name": "SMPTE 2022-1 FEC decoder",
"pad-templates": {
"fec_%%u": {
"caps": "application/x-rtp:\n",
"direction": "sink",
"presence": "request"
},
"sink": {
"caps": "application/x-rtp:\n",
"direction": "sink",
"presence": "always"
},
"src": {
"caps": "application/x-rtp:\n",
"direction": "src",
"presence": "always"
}
},
"properties": {
"size-time": {
"blurb": "The amount of data to store (in ns, 0-disable)",
"conditionally-available": false,
"construct": true,
"construct-only": false,
"controllable": false,
"default": "1000000000",
"max": "18446744073709551615",
"min": "0",
"mutable": "null",
"readable": true,
"type": "guint64",
"writable": true
}
},
"rank": "none"
}
},
"filename": "gstrtpmanager",

301
gst/rtpmanager/gstrtpbin.c
View file

@ -165,6 +165,23 @@ static GstStaticPadTemplate rtpbin_recv_rtp_sink_template =
GST_STATIC_CAPS ("application/x-rtp;application/x-srtp")
);
/**
* GstRtpBin!recv_fec_sink_%u_%u:
*
* Sink template for receiving Forward Error Correction packets,
* in the form recv_fec_sink_<session_idx>_<fec_stream_idx>
*
* See #GstRTPST_2022_1_FecDec for example usage
*
* Since: 1.20
*/
static GstStaticPadTemplate rtpbin_recv_fec_sink_template =
GST_STATIC_PAD_TEMPLATE ("recv_fec_sink_%u_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate rtpbin_recv_rtcp_sink_template =
GST_STATIC_PAD_TEMPLATE ("recv_rtcp_sink_%u",
GST_PAD_SINK,
@ -344,6 +361,7 @@ enum
PROP_MAX_STREAMS,
PROP_MAX_TS_OFFSET_ADJUSTMENT,
PROP_MAX_TS_OFFSET,
PROP_FEC_DECODERS,
};
#define GST_RTP_BIN_RTCP_SYNC_TYPE (gst_rtp_bin_rtcp_sync_get_type())
@ -377,6 +395,7 @@ static void payload_type_change (GstElement * element, guint pt,
GstRtpBinSession * session);
static void remove_recv_rtp (GstRtpBin * rtpbin, GstRtpBinSession * session);
static void remove_recv_rtcp (GstRtpBin * rtpbin, GstRtpBinSession * session);
static void remove_recv_fec (GstRtpBin * rtpbin, GstRtpBinSession * session);
static void remove_send_rtp (GstRtpBin * rtpbin, GstRtpBinSession * session);
static void remove_rtcp (GstRtpBin * rtpbin, GstRtpBinSession * session);
static void free_client (GstRtpBinClient * client, GstRtpBin * bin);
@ -486,6 +505,10 @@ struct _GstRtpBinSession
GstPad *send_rtp_src_ghost;
GstPad *send_rtcp_src;
GstPad *send_rtcp_src_ghost;
GSList *recv_fec_sinks;
GSList *recv_fec_sink_ghosts;
GstElement *fec_decoder;
};
/* Manages the RTP streams that come from one client and should therefore be
@ -517,6 +540,12 @@ find_session_by_id (GstRtpBin * rtpbin, gint id)
return NULL;
}
static gboolean
pad_is_recv_fec (GstRtpBinSession * session, GstPad * pad)
{
return g_slist_find (session->recv_fec_sink_ghosts, pad) != NULL;
}
/* find a session with the given request pad. Must be called with RTP_BIN_LOCK */
static GstRtpBinSession *
find_session_by_pad (GstRtpBin * rtpbin, GstPad * pad)
@ -528,8 +557,8 @@ find_session_by_pad (GstRtpBin * rtpbin, GstPad * pad)
if ((sess->recv_rtp_sink_ghost == pad) ||
(sess->recv_rtcp_sink_ghost == pad) ||
(sess->send_rtp_sink_ghost == pad)
|| (sess->send_rtcp_src_ghost == pad))
(sess->send_rtp_sink_ghost == pad) ||
(sess->send_rtcp_src_ghost == pad) || pad_is_recv_fec (sess, pad))
return sess;
}
return NULL;
@ -850,6 +879,7 @@ free_session (GstRtpBinSession * sess, GstRtpBin * bin)
remove_recv_rtp (bin, sess);
remove_recv_rtcp (bin, sess);
remove_recv_fec (bin, sess);
remove_send_rtp (bin, sess);
remove_rtcp (bin, sess);
@ -2640,6 +2670,24 @@ gst_rtp_bin_class_init (GstRtpBinClass * klass)
"changed to 0 (no limit)", 0, G_MAXINT64, DEFAULT_MAX_TS_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpBin:fec-decoders:
*
* Used to provide a factory used to build the FEC decoder for a
* given session, as a command line alternative to
* #GstRtpBin::request-fec-decoder.
*
* Expects a GstStructure in the form session_id (gint) -> factory (string)
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class, PROP_FEC_DECODERS,
g_param_spec_boxed ("fec-decoders", "Fec Decoders",
"GstStructure mapping from session index to FEC decoder "
"factory, eg "
"fec-decoders='fec,0=\"rtpst2022-1-fecdec\\ size-time\\=1000000000\";'",
GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_bin_change_state);
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtp_bin_request_new_pad);
@ -2648,6 +2696,8 @@ gst_rtp_bin_class_init (GstRtpBinClass * klass)
/* sink pads */
gst_element_class_add_static_pad_template (gstelement_class,
&rtpbin_recv_rtp_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&rtpbin_recv_fec_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&rtpbin_recv_rtcp_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
@ -2726,6 +2776,8 @@ gst_rtp_bin_init (GstRtpBin * rtpbin)
cname = g_strdup_printf ("user%u@host-%x", g_random_int (), g_random_int ());
rtpbin->sdes = gst_structure_new ("application/x-rtp-source-sdes",
"cname", G_TYPE_STRING, cname, "tool", G_TYPE_STRING, "GStreamer", NULL);
rtpbin->fec_decoders =
gst_structure_new_empty ("application/x-rtp-fec-decoders");
g_free (cname);
}
@ -2756,6 +2808,9 @@ gst_rtp_bin_finalize (GObject * object)
if (rtpbin->sdes)
gst_structure_free (rtpbin->sdes);
if (rtpbin->fec_decoders)
gst_structure_free (rtpbin->fec_decoders);
g_mutex_clear (&rtpbin->priv->bin_lock);
g_mutex_clear (&rtpbin->priv->dyn_lock);
@ -2788,6 +2843,25 @@ gst_rtp_bin_set_sdes_struct (GstRtpBin * bin, const GstStructure * sdes)
GST_RTP_BIN_UNLOCK (bin);
}
static void
gst_rtp_bin_set_fec_decoders_struct (GstRtpBin * bin,
const GstStructure * decoders)
{
if (decoders == NULL)
return;
GST_RTP_BIN_LOCK (bin);
GST_OBJECT_LOCK (bin);
if (bin->fec_decoders)
gst_structure_free (bin->fec_decoders);
bin->fec_decoders = gst_structure_copy (decoders);
GST_OBJECT_UNLOCK (bin);
GST_RTP_BIN_UNLOCK (bin);
}
static GstStructure *
gst_rtp_bin_get_sdes_struct (GstRtpBin * bin)
{
@ -2800,6 +2874,18 @@ gst_rtp_bin_get_sdes_struct (GstRtpBin * bin)
return result;
}
static GstStructure *
gst_rtp_bin_get_fec_decoders_struct (GstRtpBin * bin)
{
GstStructure *result;
GST_OBJECT_LOCK (bin);
result = gst_structure_copy (bin->fec_decoders);
GST_OBJECT_UNLOCK (bin);
return result;
}
static void
gst_rtp_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
@ -2963,6 +3049,9 @@ gst_rtp_bin_set_property (GObject * object, guint prop_id,
rtpbin->max_ts_offset = g_value_get_int64 (value);
rtpbin->max_ts_offset_is_set = TRUE;
break;
case PROP_FEC_DECODERS:
gst_rtp_bin_set_fec_decoders_struct (rtpbin, g_value_get_boxed (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -3057,6 +3146,9 @@ gst_rtp_bin_get_property (GObject * object, guint prop_id,
case PROP_MAX_TS_OFFSET:
g_value_set_int64 (value, rtpbin->max_ts_offset);
break;
case PROP_FEC_DECODERS:
g_value_take_boxed (value, gst_rtp_bin_get_fec_decoders_struct (rtpbin));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -3343,6 +3435,48 @@ copy_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
return TRUE;
}
static gboolean
ensure_fec_decoder (GstRtpBin * rtpbin, GstRtpBinSession * session)
{
const gchar *factory;
gchar *sess_id_str;
if (session->fec_decoder)
goto done;
sess_id_str = g_strdup_printf ("%u", session->id);
factory = gst_structure_get_string (rtpbin->fec_decoders, sess_id_str);
g_free (sess_id_str);
/* First try the property */
if (factory) {
GError *err = NULL;
session->fec_decoder =
gst_parse_bin_from_description_full (factory, TRUE, NULL,
GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS | GST_PARSE_FLAG_FATAL_ERRORS,
&err);
if (!session->fec_decoder) {
GST_ERROR_OBJECT (rtpbin, "Failed to build decoder from factory: %s",
err->message);
}
bin_manage_element (session->bin, session->fec_decoder);
session->elements =
g_slist_prepend (session->elements, session->fec_decoder);
GST_INFO_OBJECT (rtpbin, "Built FEC decoder: %" GST_PTR_FORMAT
" for session %u", session->fec_decoder, session->id);
}
/* Fallback to the signal */
if (!session->fec_decoder)
session->fec_decoder =
session_request_element (session, SIGNAL_REQUEST_FEC_DECODER);
done:
return session->fec_decoder != NULL;
}
static void
expose_recv_src_pad (GstRtpBin * rtpbin, GstPad * pad, GstRtpBinStream * stream,
guint8 pt)
@ -3354,11 +3488,9 @@ expose_recv_src_pad (GstRtpBin * rtpbin, GstPad * pad, GstRtpBinStream * stream,
gst_object_ref (pad);
if (stream->session->storage) {
GstElement *fec_decoder =
session_request_element (stream->session, SIGNAL_REQUEST_FEC_DECODER);
if (fec_decoder) {
if (stream->session->storage && !stream->session->fec_decoder) {
if (ensure_fec_decoder (rtpbin, stream->session)) {
GstElement *fec_decoder = stream->session->fec_decoder;
GstPad *sinkpad, *srcpad;
GstPadLinkReturn ret;
@ -3594,6 +3726,15 @@ new_ssrc_pad_found (GstElement * element, guint ssrc, GstPad * pad,
padname = g_strdup_printf ("src_%u", ssrc);
srcpad = gst_element_get_static_pad (element, padname);
g_free (padname);
if (session->fec_decoder) {
sinkpad = gst_element_get_static_pad (session->fec_decoder, "sink");
gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_NOTHING);
gst_object_unref (sinkpad);
gst_object_unref (srcpad);
srcpad = gst_element_get_static_pad (session->fec_decoder, "src");
}
sinkpad = gst_element_get_static_pad (stream->buffer, "sink");
gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_NOTHING);
gst_object_unref (sinkpad);
@ -3933,6 +4074,41 @@ remove_recv_rtp (GstRtpBin * rtpbin, GstRtpBinSession * session)
}
}
static GstPad *
complete_session_fec (GstRtpBin * rtpbin, GstRtpBinSession * session,
guint fec_idx)
{
gchar *padname;
GstPad *ret;
if (!ensure_fec_decoder (rtpbin, session))
goto no_decoder;
GST_DEBUG_OBJECT (rtpbin, "getting FEC sink pad");
padname = g_strdup_printf ("fec_%u", fec_idx);
ret = gst_element_get_request_pad (session->fec_decoder, padname);
g_free (padname);
if (ret == NULL)
goto pad_failed;
session->recv_fec_sinks = g_slist_prepend (session->recv_fec_sinks, ret);
return ret;
pad_failed:
{
g_warning ("rtpbin: failed to get decoder fec pad");
return NULL;
}
no_decoder:
{
g_warning ("rtpbin: failed to build FEC decoder for session %u",
session->id);
return NULL;
}
}
static GstPad *
complete_session_rtcp (GstRtpBin * rtpbin, GstRtpBinSession * session,
guint sessid)
@ -4076,6 +4252,66 @@ create_error:
}
}
static GstPad *
create_recv_fec (GstRtpBin * rtpbin, GstPadTemplate * templ, const gchar * name)
{
guint sessid, fec_idx;
GstRtpBinSession *session;
GstPad *decsink = NULL;
GstPad *ghost;
/* first get the session number */
if (name == NULL
|| sscanf (name, "recv_fec_sink_%u_%u", &sessid, &fec_idx) != 2)
goto no_name;
if (fec_idx > 1)
goto invalid_idx;
GST_DEBUG_OBJECT (rtpbin, "finding session %u", sessid);
/* get or create the session */
session = find_session_by_id (rtpbin, sessid);
if (!session) {
GST_DEBUG_OBJECT (rtpbin, "creating session %u", sessid);
/* create session now */
session = create_session (rtpbin, sessid);
if (session == NULL)
goto create_error;
}
decsink = complete_session_fec (rtpbin, session, fec_idx);
if (!decsink)
goto create_error;
ghost = gst_ghost_pad_new_from_template (name, decsink, templ);
session->recv_fec_sink_ghosts =
g_slist_prepend (session->recv_fec_sink_ghosts, ghost);
gst_object_unref (decsink);
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (rtpbin), ghost);
return ghost;
/* ERRORS */
no_name:
{
g_warning ("rtpbin: cannot find session id for pad: %s",
GST_STR_NULL (name));
return NULL;
}
invalid_idx:
{
g_warning ("rtpbin: invalid FEC index: %s", GST_STR_NULL (name));
return NULL;
}
create_error:
{
/* create_session already warned */
return NULL;
}
}
static void
remove_recv_rtcp (GstRtpBin * rtpbin, GstRtpBinSession * session)
{
@ -4097,6 +4333,49 @@ remove_recv_rtcp (GstRtpBin * rtpbin, GstRtpBinSession * session)
}
}
static void
remove_recv_fec_for_pad (GstRtpBin * rtpbin, GstRtpBinSession * session,
GstPad * ghost)
{
GSList *item;
GstPad *target;
target = gst_ghost_pad_get_target (GST_GHOST_PAD (ghost));
if (target) {
item = g_slist_find (session->recv_fec_sinks, target);
if (item) {
gst_element_release_request_pad (session->fec_decoder, item->data);
session->recv_fec_sinks =
g_slist_delete_link (session->recv_fec_sinks, item);
}
gst_object_unref (target);
}
item = g_slist_find (session->recv_fec_sink_ghosts, ghost);
if (item)
session->recv_fec_sink_ghosts =
g_slist_delete_link (session->recv_fec_sink_ghosts, item);
gst_pad_set_active (ghost, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (rtpbin), ghost);
}
static void
remove_recv_fec (GstRtpBin * rtpbin, GstRtpBinSession * session)
{
GSList *copy;
GSList *tmp;
copy = g_slist_copy (session->recv_fec_sink_ghosts);
for (tmp = copy; tmp; tmp = tmp->next) {
remove_recv_fec_for_pad (rtpbin, session, (GstPad *) tmp->data);
}
g_slist_free (copy);
}
static gboolean
complete_session_src (GstRtpBin * rtpbin, GstRtpBinSession * session)
{
@ -4699,6 +4978,9 @@ gst_rtp_bin_request_new_pad (GstElement * element,
} else if (templ == gst_element_class_get_pad_template (klass,
"send_rtcp_src_%u")) {
result = create_send_rtcp (rtpbin, templ, pad_name);
} else if (templ == gst_element_class_get_pad_template (klass,
"recv_fec_sink_%u_%u")) {
result = create_recv_fec (rtpbin, templ, pad_name);
} else
goto wrong_template;
@ -4743,13 +5025,16 @@ gst_rtp_bin_release_pad (GstElement * element, GstPad * pad)
remove_send_rtp (rtpbin, session);
} else if (session->send_rtcp_src_ghost == pad) {
remove_rtcp (rtpbin, session);
} else if (pad_is_recv_fec (session, pad)) {
remove_recv_fec_for_pad (rtpbin, session, pad);
}
/* no more request pads, free the complete session */
if (session->recv_rtp_sink_ghost == NULL
&& session->recv_rtcp_sink_ghost == NULL
&& session->send_rtp_sink_ghost == NULL
&& session->send_rtcp_src_ghost == NULL) {
&& session->send_rtcp_src_ghost == NULL
&& session->recv_fec_sink_ghosts == NULL) {
GST_DEBUG_OBJECT (rtpbin, "no more pads for session %p", session);
rtpbin->sessions = g_slist_remove (rtpbin->sessions, session);
free_session (session, rtpbin);

3
gst/rtpmanager/gstrtpbin.h
View file

@ -88,6 +88,9 @@ struct _GstRtpBin {
/* the default SDES items for sessions */
GstStructure *sdes;
/* the default FEC decoder factories for sessions */
GstStructure *fec_decoders;
/*< private >*/
GstRtpBinPrivate *priv;
};

5
gst/rtpmanager/gstrtpmanager.c
View file

@ -32,6 +32,7 @@
#include "gstrtpdtmfmux.h"
#include "gstrtpmux.h"
#include "gstrtpfunnel.h"
#include "gstrtpst2022-1-fecdec.h"
static gboolean
plugin_init (GstPlugin * plugin)
@ -74,6 +75,10 @@ plugin_init (GstPlugin * plugin)
GST_TYPE_RTP_FUNNEL))
return FALSE;
if (!gst_element_register (plugin, "rtpst2022-1-fecdec", GST_RANK_NONE,
GST_TYPE_RTPST_2022_1_FECDEC))
return FALSE;
return TRUE;
}

995
gst/rtpmanager/gstrtpst2022-1-fecdec.c Normal file
View file

@ -0,0 +1,995 @@
/* GStreamer
* Copyright (C) <2020> Mathieu Duponchelle <mathieu@centricular.com>
*
* 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-rtpst2022-1-fecdec
* @see_also: #element-rtpst2022-1-fecenc
*
* This element takes as input a media stream and up to two FEC
* streams as described in SMPTE 2022-1: Forward Error Correction
* for Real-Time Video/Audio Transport Over IP Networks, and makes
* use of the FEC packets to recover media packets that may have
* gotten lost.
*
* ## Design
*
* The approach picked for this element is to proactively reconstruct missing
* packets as soon as possible. When a FEC packet arrives, the element
* immediately checks whether a media packet in the row / column it protects
* can be reconstructed.
*
* Similarly, when a media packet comes in, the element checks whether it has
* already received a corresponding packet in both the column and row the packet
* belongs to, and if so goes through the first step listed above.
*
* This process is repeated recursively, allowing for recoveries over one
* dimension to unblock recoveries over the other.
*
* In perfect networking conditions, this incurs next to no overhead as FEC
* packets will arrive after the media packets, causing no reconstruction to
* take place, just a few checks upon chaining.
*
* ## sender / receiver example
*
* ``` shell
* gst-launch-1.0 \
* rtpbin name=rtp fec-encoders='fec,0="rtpst2022-1-fecenc\ rows\=5\ columns\=5";' \
* uridecodebin uri=file:///path/to/video/file ! x264enc key-int-max=60 tune=zerolatency ! \
* queue ! mpegtsmux ! rtpmp2tpay ssrc=0 ! rtp.send_rtp_sink_0 \
* rtp.send_rtp_src_0 ! udpsink host=127.0.0.1 port=5000 \
* rtp.send_fec_src_0_0 ! udpsink host=127.0.0.1 port=5002 async=false \
* rtp.send_fec_src_0_1 ! udpsink host=127.0.0.1 port=5004 async=false
* ```
*
* ``` shell
* gst-launch-1.0 \
* rtpbin latency=500 fec-decoders='fec,0="rtpst2022-1-fecdec\ size-time\=1000000000";' name=rtp \
* udpsrc address=127.0.0.1 port=5002 caps="application/x-rtp, payload=96" ! queue ! rtp.recv_fec_sink_0_0 \
* udpsrc address=127.0.0.1 port=5004 caps="application/x-rtp, payload=96" ! queue ! rtp.recv_fec_sink_0_1 \
* udpsrc address=127.0.0.1 port=5000 caps="application/x-rtp, media=video, clock-rate=90000, encoding-name=mp2t, payload=33" ! \
* queue ! netsim drop-probability=0.05 ! rtp.recv_rtp_sink_0 \
* rtp. ! decodebin ! videoconvert ! queue ! autovideosink
* ```
*
* With the above command line, as the media packet size is constant,
* the fec overhead can be approximated to the number of fec packets
* per 2-d matrix of media packet, here 10 fec packets for each 25
* media packets.
*
* Increasing the number of rows and columns will decrease the overhead,
* but obviously increase the likelihood of recovery failure for lost
* packets on the receiver side.
*
* Since: 1.20
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/base/base.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpst2022-1-fecdec.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtpst_2022_1_fecdec_debug);
#define GST_CAT_DEFAULT gst_rtpst_2022_1_fecdec_debug
#define DEFAULT_SIZE_TIME (GST_SECOND)
typedef struct
{
guint16 seq;
GstBuffer *buffer;
} Item;
static GstFlowReturn store_media_item (GstRTPST_2022_1_FecDec * dec,
GstRTPBuffer * rtp, Item * item);
static void
free_item (Item * item)
{
gst_buffer_unref (item->buffer);
item->buffer = NULL;
g_free (item);
}
static gint
cmp_items (Item * a, Item * b, gpointer unused)
{
return gst_rtp_buffer_compare_seqnum (b->seq, a->seq);
}
enum
{
PROP_0,
PROP_SIZE_TIME,
};
struct _GstRTPST_2022_1_FecDecClass
{
GstElementClass class;
};
struct _GstRTPST_2022_1_FecDec
{
GstElement element;
GstPad *srcpad;
GstPad *sinkpad;
GList *fec_sinkpads;
/* All the following field are protected by the OBJECT_LOCK */
GSequence *packets;
GHashTable *column_fec_packets;
GSequence *fec_packets[2];
/* N columns */
guint l;
/* N rows */
guint d;
GstClockTime size_time;
GstClockTime max_arrival_time;
GstClockTime max_fec_arrival_time[2];
};
#define RTP_CAPS "application/x-rtp"
typedef struct
{
guint16 seq;
guint16 len;
guint8 E;
guint8 pt;
guint32 mask;
guint32 timestamp;
guint8 N;
guint8 D;
guint8 type;
guint8 index;
guint8 offset;
guint8 NA;
guint8 seq_ext;
guint8 *payload;
guint payload_len;
} Rtp2DFecHeader;
static GstStaticPadTemplate fec_sink_template =
GST_STATIC_PAD_TEMPLATE ("fec_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (RTP_CAPS));
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (RTP_CAPS));
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (RTP_CAPS));
#define gst_rtpst_2022_1_fecdec_parent_class parent_class
G_DEFINE_TYPE (GstRTPST_2022_1_FecDec, gst_rtpst_2022_1_fecdec,
GST_TYPE_ELEMENT);
static void
trim_items (GstRTPST_2022_1_FecDec * dec)
{
GSequenceIter *tmp_iter, *iter = NULL;
for (tmp_iter = g_sequence_get_begin_iter (dec->packets);
tmp_iter; tmp_iter = g_sequence_iter_next (tmp_iter)) {
Item *item;
if (g_sequence_iter_is_end (tmp_iter))
break;
item = g_sequence_get (tmp_iter);
if (dec->max_arrival_time - GST_BUFFER_DTS_OR_PTS (item->buffer) <
dec->size_time)
break;
iter = tmp_iter;
}
if (iter) {
Item *item = g_sequence_get (iter);
GST_TRACE_OBJECT (dec,
"Trimming packets up to %" GST_TIME_FORMAT " (seq: %u)",
GST_TIME_ARGS (GST_BUFFER_DTS_OR_PTS (item->buffer)), item->seq);
g_sequence_remove_range (g_sequence_get_begin_iter (dec->packets), iter);
}
}
static void
trim_fec_items (GstRTPST_2022_1_FecDec * dec, guint D)
{
GSequenceIter *tmp_iter, *iter = NULL;
for (tmp_iter = g_sequence_get_begin_iter (dec->fec_packets[D]);
tmp_iter; tmp_iter = g_sequence_iter_next (tmp_iter)) {
Item *item;
if (g_sequence_iter_is_end (tmp_iter))
break;
item = g_sequence_get (tmp_iter);
if (dec->max_fec_arrival_time[D] - GST_BUFFER_DTS_OR_PTS (item->buffer) <
dec->size_time)
break;
if (!D) {
guint i;
guint16 seq;
for (i = 0; i < dec->d; i++) {
seq = item->seq + i * dec->l;
g_hash_table_remove (dec->column_fec_packets, GUINT_TO_POINTER (seq));
}
}
iter = tmp_iter;
}
if (iter) {
Item *item = g_sequence_get (iter);
GST_TRACE_OBJECT (dec,
"Trimming %s FEC packets up to %" GST_TIME_FORMAT " (seq: %u)",
D ? "row" : "column",
GST_TIME_ARGS (GST_BUFFER_DTS_OR_PTS (item->buffer)), item->seq);
g_sequence_remove_range (g_sequence_get_begin_iter (dec->fec_packets[D]),
iter);
}
}
static Item *
lookup_media_packet (GstRTPST_2022_1_FecDec * dec, guint16 seqnum)
{
GSequenceIter *iter;
Item *ret = NULL;
Item dummy = { seqnum, NULL };
iter =
g_sequence_lookup (dec->packets, &dummy, (GCompareDataFunc) cmp_items,
NULL);
if (iter)
ret = g_sequence_get (iter);
return ret;
}
static gboolean
parse_header (Rtp2DFecHeader * fec, guint8 * data, guint len)
{
gboolean ret = FALSE;
GstBitReader bits;
if (len < 16)
goto done;
gst_bit_reader_init (&bits, data, len);
fec->seq = gst_bit_reader_get_bits_uint16_unchecked (&bits, 16);
fec->len = gst_bit_reader_get_bits_uint16_unchecked (&bits, 16);
fec->E = gst_bit_reader_get_bits_uint8_unchecked (&bits, 1);
fec->pt = gst_bit_reader_get_bits_uint8_unchecked (&bits, 7);
fec->mask = gst_bit_reader_get_bits_uint32_unchecked (&bits, 24);
fec->timestamp = gst_bit_reader_get_bits_uint32_unchecked (&bits, 32);
fec->N = gst_bit_reader_get_bits_uint8_unchecked (&bits, 1);
fec->D = gst_bit_reader_get_bits_uint8_unchecked (&bits, 1);
fec->type = gst_bit_reader_get_bits_uint8_unchecked (&bits, 3);
fec->index = gst_bit_reader_get_bits_uint8_unchecked (&bits, 3);
fec->offset = gst_bit_reader_get_bits_uint8_unchecked (&bits, 8);
fec->NA = gst_bit_reader_get_bits_uint8_unchecked (&bits, 8);
fec->seq_ext = gst_bit_reader_get_bits_uint8_unchecked (&bits, 8);
fec->payload = data + 16;
fec->payload_len = len - 16;
ret = TRUE;
done:
return ret;
}
static Item *
get_row_fec (GstRTPST_2022_1_FecDec * dec, guint16 seqnum)
{
GSequenceIter *iter;
Item *ret = NULL;
Item dummy = { 0, };
if (dec->l == G_MAXUINT)
goto done;
/* Potential underflow is intended */
dummy.seq = seqnum - dec->l;
iter =
g_sequence_search (dec->fec_packets[1], &dummy,
(GCompareDataFunc) cmp_items, NULL);
if (!g_sequence_iter_is_end (iter)) {
gint seqdiff;
ret = g_sequence_get (iter);
seqdiff = gst_rtp_buffer_compare_seqnum (ret->seq, seqnum);
/* Now check whether the fec packet does apply */
if (seqdiff < 0 || seqdiff >= dec->l)
ret = NULL;
}
done:
return ret;
}
static Item *
get_column_fec (GstRTPST_2022_1_FecDec * dec, guint16 seqnum)
{
Item *ret = NULL;
if (dec->l == G_MAXUINT || dec->d == G_MAXUINT)
goto done;
ret =
g_hash_table_lookup (dec->column_fec_packets, GUINT_TO_POINTER (seqnum));
done:
return ret;
}
static void
_xor_mem (guint8 * restrict dst, const guint8 * restrict src, gsize length)
{
guint i;
for (i = 0; i < (length / sizeof (guint64)); ++i) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
GST_WRITE_UINT64_LE (dst,
GST_READ_UINT64_LE (dst) ^ GST_READ_UINT64_LE (src));
#else
GST_WRITE_UINT64_BE (dst,
GST_READ_UINT64_BE (dst) ^ GST_READ_UINT64_BE (src));
#endif
dst += sizeof (guint64);
src += sizeof (guint64);
}
for (i = 0; i < (length % sizeof (guint64)); ++i)
dst[i] ^= src[i];
}
static GstFlowReturn
xor_items (GstRTPST_2022_1_FecDec * dec, Rtp2DFecHeader * fec, GList * packets,
guint16 seqnum)
{
guint8 *xored;
guint32 xored_timestamp;
guint8 xored_pt;
guint16 xored_payload_len;
Item *item;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GList *tmp;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
/* Figure out the recovered packet length first */
xored_payload_len = fec->len;
for (tmp = packets; tmp; tmp = tmp->next) {
GstRTPBuffer media_rtp = GST_RTP_BUFFER_INIT;
Item *item = (Item *) tmp->data;
gst_rtp_buffer_map (item->buffer, GST_MAP_READ, &media_rtp);
xored_payload_len ^= gst_rtp_buffer_get_payload_len (&media_rtp);
gst_rtp_buffer_unmap (&media_rtp);
}
if (xored_payload_len > fec->payload_len) {
GST_WARNING_OBJECT (dec, "FEC payload len %u < length recovery %u",
fec->payload_len, xored_payload_len);
goto done;
}
item = g_malloc0 (sizeof (Item));
item->seq = seqnum;
item->buffer = gst_rtp_buffer_new_allocate (xored_payload_len, 0, 0);
gst_rtp_buffer_map (item->buffer, GST_MAP_WRITE, &rtp);
xored = gst_rtp_buffer_get_payload (&rtp);
memcpy (xored, fec->payload, xored_payload_len);
xored_timestamp = fec->timestamp;
xored_pt = fec->pt;
for (tmp = packets; tmp; tmp = tmp->next) {
GstRTPBuffer media_rtp = GST_RTP_BUFFER_INIT;
Item *item = (Item *) tmp->data;
gst_rtp_buffer_map (item->buffer, GST_MAP_READ, &media_rtp);
_xor_mem (xored, gst_rtp_buffer_get_payload (&media_rtp),
gst_rtp_buffer_get_payload_len (&media_rtp));
xored_timestamp ^= gst_rtp_buffer_get_timestamp (&media_rtp);
xored_pt ^= gst_rtp_buffer_get_payload_type (&media_rtp);
gst_rtp_buffer_unmap (&media_rtp);
}
GST_DEBUG_OBJECT (dec,
"Recovered buffer through %s FEC with seqnum %u, payload len %u and timestamp %u",
fec->D ? "row" : "column", seqnum, xored_payload_len, xored_timestamp);
GST_BUFFER_DTS (item->buffer) = dec->max_arrival_time;
gst_rtp_buffer_set_timestamp (&rtp, xored_timestamp);
gst_rtp_buffer_set_seq (&rtp, seqnum);
gst_rtp_buffer_set_payload_type (&rtp, xored_pt);
gst_rtp_buffer_unmap (&rtp);
/* Store a ref on item->buffer as store_media_item may
* recurse and call this method again, potentially releasing
* the object lock and leaving our item unprotected in
* dec->packets
*/
buffer = gst_buffer_ref (item->buffer);
/* It is right that we should celebrate,
* for your brother was dead, and is alive again */
gst_rtp_buffer_map (item->buffer, GST_MAP_READ, &rtp);
ret = store_media_item (dec, &rtp, item);
gst_rtp_buffer_unmap (&rtp);
if (ret == GST_FLOW_OK) {
/* Unlocking here is safe */
GST_OBJECT_UNLOCK (dec);
ret = gst_pad_push (dec->srcpad, buffer);
GST_OBJECT_LOCK (dec);
} else {
gst_buffer_unref (buffer);
}
done:
return ret;
}
/* Returns a flow value if we should discard the packet, GST_FLOW_CUSTOM_SUCCESS otherwise */
static GstFlowReturn
check_fec (GstRTPST_2022_1_FecDec * dec, Rtp2DFecHeader * fec)
{
GList *packets = NULL;
gint missing_seq = -1;
guint n_packets = 0;
guint required_n_packets;
GstFlowReturn ret = GST_FLOW_OK;
if (fec->D) {
guint i = 0;
required_n_packets = dec->l;
for (i = 0; i < dec->l; i++) {
Item *item = lookup_media_packet (dec, fec->seq + i);
if (item) {
packets = g_list_prepend (packets, item);
n_packets += 1;
} else {
missing_seq = fec->seq + i;
}
}
} else {
guint i = 0;
required_n_packets = dec->d;
for (i = 0; i < dec->d; i++) {
Item *item = lookup_media_packet (dec, fec->seq + i * dec->l);
if (item) {
packets = g_list_prepend (packets, item);
n_packets += 1;
} else {
missing_seq = fec->seq + i * dec->l;
}
}
}
if (n_packets == required_n_packets) {
g_assert (missing_seq == -1);
GST_LOG_OBJECT (dec,
"All media packets present, we can discard that FEC packet");
} else if (n_packets + 1 == required_n_packets) {
g_assert (missing_seq != -1);
ret = xor_items (dec, fec, packets, missing_seq);
GST_LOG_OBJECT (dec, "We have enough info to reconstruct %u", missing_seq);
} else {
ret = GST_FLOW_CUSTOM_SUCCESS;
GST_LOG_OBJECT (dec, "Too many media packets missing, storing FEC packet");
}
g_list_free (packets);
return ret;
}
static GstFlowReturn
check_fec_item (GstRTPST_2022_1_FecDec * dec, Item * item)
{
Rtp2DFecHeader fec;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
guint payload_len;
guint8 *payload;
GstFlowReturn ret;
gst_rtp_buffer_map (item->buffer, GST_MAP_READ, &rtp);
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
parse_header (&fec, payload, payload_len);
ret = check_fec (dec, &fec);
gst_rtp_buffer_unmap (&rtp);
return ret;
}
static GstFlowReturn
store_media_item (GstRTPST_2022_1_FecDec * dec, GstRTPBuffer * rtp, Item * item)
{
GstFlowReturn ret = GST_FLOW_OK;
Item *fec_item;
guint16 seq;
seq = gst_rtp_buffer_get_seq (rtp);
g_sequence_insert_sorted (dec->packets, item, (GCompareDataFunc) cmp_items,
NULL);
if ((fec_item = get_row_fec (dec, seq))) {
ret = check_fec_item (dec, fec_item);
if (ret == GST_FLOW_CUSTOM_SUCCESS)
ret = GST_FLOW_OK;
}
if (ret == GST_FLOW_OK && (fec_item = get_column_fec (dec, seq))) {
ret = check_fec_item (dec, fec_item);
if (ret == GST_FLOW_CUSTOM_SUCCESS)
ret = GST_FLOW_OK;
}
return ret;
}
static GstFlowReturn
store_media (GstRTPST_2022_1_FecDec * dec, GstRTPBuffer * rtp,
GstBuffer * buffer)
{
Item *item;
guint16 seq;
seq = gst_rtp_buffer_get_seq (rtp);
item = g_malloc0 (sizeof (Item));
item->buffer = gst_buffer_ref (buffer);
item->seq = seq;
return store_media_item (dec, rtp, item);
}
static GstFlowReturn
gst_rtpst_2022_1_fecdec_sink_chain_fec (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (parent);
Rtp2DFecHeader fec = { 0, };
guint payload_len;
guint8 *payload;
GstFlowReturn ret = GST_FLOW_OK;
Item *item;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GST_OBJECT_LOCK (dec);
if (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp)) {
GST_WARNING_OBJECT (pad, "Chained FEC buffer isn't valid RTP");
goto discard;
}
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
if (!parse_header (&fec, payload, payload_len)) {
GST_WARNING_OBJECT (pad, "Failed to parse FEC header (payload len: %d)",
payload_len);
GST_MEMDUMP_OBJECT (pad, "Invalid payload", payload, payload_len);
goto discard;
}
GST_TRACE_OBJECT
(pad,
"Handling FEC buffer with SNBase / N / D / NA / offset %u / %u / %u / %u / %u",
fec.seq, fec.N, fec.D, fec.NA, fec.offset);
if (fec.D) {
if (dec->l == G_MAXUINT) {
dec->l = fec.NA;
} else if (fec.NA != dec->l) {
GST_WARNING_OBJECT (dec, "2D FEC dimensionality cannot change");
goto discard;
}
if (fec.offset != 1) {
GST_WARNING_OBJECT (pad, "offset must be 1 for row FEC packets");
goto discard;
}
} else {
if (dec->d == G_MAXUINT) {
dec->d = fec.NA;
} else if (fec.NA != dec->d) {
GST_WARNING_OBJECT (dec, "2D FEC dimensionality cannot change");
goto discard;
}
if (dec->l == G_MAXUINT) {
dec->l = fec.offset;
} else if (fec.offset != dec->l) {
GST_WARNING_OBJECT (dec, "2D FEC dimensionality cannot change");
goto discard;
}
}
dec->max_fec_arrival_time[fec.D] = GST_BUFFER_DTS_OR_PTS (buffer);
trim_fec_items (dec, fec.D);
ret = check_fec (dec, &fec);
if (ret == GST_FLOW_CUSTOM_SUCCESS) {
item = g_malloc0 (sizeof (Item));
item->buffer = buffer;
item->seq = fec.seq;
if (!fec.D) {
guint i;
guint16 seq;
for (i = 0; i < dec->d; i++) {
seq = fec.seq + i * dec->l;
g_hash_table_insert (dec->column_fec_packets, GUINT_TO_POINTER (seq),
item);
}
}
g_sequence_insert_sorted (dec->fec_packets[fec.D], item,
(GCompareDataFunc) cmp_items, NULL);
ret = GST_FLOW_OK;
} else {
goto discard;
}
gst_rtp_buffer_unmap (&rtp);
done:
GST_OBJECT_UNLOCK (dec);
return ret;
discard:
if (rtp.buffer != NULL)
gst_rtp_buffer_unmap (&rtp);
gst_buffer_unref (buffer);
goto done;
}
static GstFlowReturn
gst_rtpst_2022_1_fecdec_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (parent);
GstFlowReturn ret = GST_FLOW_OK;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
if (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp)) {
GST_WARNING_OBJECT (pad, "Chained buffer isn't valid RTP");
goto error;
}
GST_OBJECT_LOCK (dec);
dec->max_arrival_time =
MAX (dec->max_arrival_time, GST_BUFFER_DTS_OR_PTS (buffer));
trim_items (dec);
ret = store_media (dec, &rtp, buffer);
GST_OBJECT_UNLOCK (dec);
gst_rtp_buffer_unmap (&rtp);
if (ret == GST_FLOW_OK)
ret = gst_pad_push (dec->srcpad, buffer);
done:
return ret;
error:
gst_buffer_unref (buffer);
goto done;
}
static gboolean
gst_rtpst_2022_1_fecdec_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean handled = FALSE;
gboolean ret = TRUE;
if (!handled) {
gst_pad_event_default (pad, parent, event);
}
return ret;
}
/* Takes the object lock */
static void
gst_rtpst_2022_1_fecdec_reset (GstRTPST_2022_1_FecDec * dec, gboolean allocate)
{
guint i;
GST_OBJECT_LOCK (dec);
if (dec->packets) {
g_sequence_free (dec->packets);
dec->packets = NULL;
}
if (dec->column_fec_packets) {
g_hash_table_unref (dec->column_fec_packets);
dec->column_fec_packets = NULL;
}
if (allocate) {
dec->packets = g_sequence_new ((GDestroyNotify) free_item);
dec->column_fec_packets = g_hash_table_new (g_direct_hash, g_direct_equal);
}
for (i = 0; i < 2; i++) {
if (dec->fec_packets[i]) {
g_sequence_free (dec->fec_packets[i]);
dec->fec_packets[i] = NULL;
}
if (allocate)
dec->fec_packets[i] = g_sequence_new ((GDestroyNotify) free_item);
}
dec->d = G_MAXUINT;
dec->l = G_MAXUINT;
GST_OBJECT_UNLOCK (dec);
}
static GstStateChangeReturn
gst_rtpst_2022_1_fecdec_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret;
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtpst_2022_1_fecdec_reset (dec, TRUE);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtpst_2022_1_fecdec_reset (dec, FALSE);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return ret;
}
static void
gst_rtpst_2022_1_fecdec_finalize (GObject * object)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (object);
gst_rtpst_2022_1_fecdec_reset (dec, FALSE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_rtpst_2022_1_fecdec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (object);
switch (prop_id) {
case PROP_SIZE_TIME:
dec->size_time = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtpst_2022_1_fecdec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (object);
switch (prop_id) {
case PROP_SIZE_TIME:
g_value_set_uint64 (value, dec->size_time);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_2d_fec_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (parent);
gboolean ret;
if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP)
gst_rtpst_2022_1_fecdec_reset (dec, TRUE);
ret = gst_pad_event_default (pad, parent, event);
return ret;
}
static GstIterator *
gst_rtpst_2022_1_fecdec_iterate_linked_pads (GstPad * pad, GstObject * parent)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (parent);
GstPad *otherpad = NULL;
GstIterator *it = NULL;
GValue val = { 0, };
if (pad == dec->srcpad)
otherpad = dec->sinkpad;
else if (pad == dec->sinkpad)
otherpad = dec->srcpad;
if (otherpad) {
g_value_init (&val, GST_TYPE_PAD);
g_value_set_object (&val, otherpad);
it = gst_iterator_new_single (GST_TYPE_PAD, &val);
g_value_unset (&val);
}
return it;
}
static GstPad *
gst_rtpst_2022_1_fecdec_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (element);
GstPad *sinkpad = NULL;
GST_DEBUG_OBJECT (element, "requesting pad");
if (g_list_length (dec->fec_sinkpads) > 1) {
GST_ERROR_OBJECT (dec, "not accepting more than two fec streams");
goto done;
}
sinkpad = gst_pad_new_from_template (templ, name);
gst_pad_set_chain_function (sinkpad, gst_rtpst_2022_1_fecdec_sink_chain_fec);
gst_element_add_pad (GST_ELEMENT (dec), sinkpad);
gst_pad_set_iterate_internal_links_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_iterate_linked_pads));
gst_pad_set_active (sinkpad, TRUE);
GST_DEBUG_OBJECT (element, "requested pad %s:%s",
GST_DEBUG_PAD_NAME (sinkpad));
done:
return sinkpad;
}
static void
gst_rtpst_2022_1_fecdec_release_pad (GstElement * element, GstPad * pad)
{
GstRTPST_2022_1_FecDec *dec = GST_RTPST_2022_1_FECDEC_CAST (element);
GST_DEBUG_OBJECT (element, "releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
dec->fec_sinkpads = g_list_remove (dec->fec_sinkpads, pad);
gst_pad_set_active (pad, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (dec), pad);
}
static void
gst_rtpst_2022_1_fecdec_class_init (GstRTPST_2022_1_FecDecClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_get_property);
gobject_class->finalize =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_finalize);
g_object_class_install_property (gobject_class, PROP_SIZE_TIME,
g_param_spec_uint64 ("size-time", "Storage size (in ns)",
"The amount of data to store (in ns, 0-disable)", 0,
G_MAXUINT64, DEFAULT_SIZE_TIME,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_change_state);
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_request_new_pad);
gstelement_class->release_pad =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_release_pad);
gst_element_class_set_static_metadata (gstelement_class,
"SMPTE 2022-1 FEC decoder", "SMPTE 2022-1 FEC decoding",
"performs FEC as described by SMPTE 2022-1",
"Mathieu Duponchelle <mathieu@centricular.com>");
gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&fec_sink_template);
gst_element_class_add_static_pad_template (gstelement_class, &src_template);
GST_DEBUG_CATEGORY_INIT (gst_rtpst_2022_1_fecdec_debug,
"rtpst2022-1-fecdec", 0, "SMPTE 2022-1 FEC decoder element");
}
static void
gst_rtpst_2022_1_fecdec_init (GstRTPST_2022_1_FecDec * dec)
{
dec->srcpad = gst_pad_new_from_static_template (&src_template, "src");
GST_PAD_SET_PROXY_CAPS (dec->srcpad);
gst_pad_use_fixed_caps (dec->srcpad);
gst_pad_set_event_function (dec->srcpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_src_event));
gst_pad_set_iterate_internal_links_function (dec->srcpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_iterate_linked_pads));
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
dec->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
GST_PAD_SET_PROXY_CAPS (dec->sinkpad);
gst_pad_set_chain_function (dec->sinkpad, gst_rtpst_2022_1_fecdec_sink_chain);
gst_pad_set_event_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_2d_fec_sink_event));
gst_pad_set_iterate_internal_links_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecdec_iterate_linked_pads));
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
dec->d = G_MAXUINT;
dec->l = G_MAXUINT;
}

37
gst/rtpmanager/gstrtpst2022-1-fecdec.h Normal file
View file

@ -0,0 +1,37 @@
/* GStreamer
* Copyright (C) <2020> Mathieu Duponchelle <mathieu@centricular.com>
*
* 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.
*/
#ifndef __GST_RTPST_2022_1_FECDEC_H__
#define __GST_RTPST_2022_1_FECDEC_H__
#include <gst/gst.h>
G_BEGIN_DECLS
typedef struct _GstRTPST_2022_1_FecDecClass GstRTPST_2022_1_FecDecClass;
typedef struct _GstRTPST_2022_1_FecDec GstRTPST_2022_1_FecDec;
#define GST_TYPE_RTPST_2022_1_FECDEC (gst_rtpst_2022_1_fecdec_get_type())
#define GST_RTPST_2022_1_FECDEC_CAST(obj) ((GstRTPST_2022_1_FecDec *)(obj))
GType gst_rtpst_2022_1_fecdec_get_type (void);
G_END_DECLS
#endif /* __GST_RTPST_2022_1_FECDEC_H__ */

1
gst/rtpmanager/meson.build
View file

@ -17,6 +17,7 @@ rtpmanager_sources = [
'rtptwcc.c',
'gstrtpsession.c',
'gstrtpfunnel.c',
'gstrtpst2022-1-fecdec.c'
]
gstrtpmanager = library('gstrtpmanager',

444
tests/check/elements/rtpst2022-1-fecdec.c Normal file
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@ -0,0 +1,444 @@
/* GStreamer
* Copyright (C) <2020> Mathieu Duponchelle <mathieu@centricular.com>
*
* 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.
*/
#include <gst/check/gstcheck.h>
#include <gst/check/gstharness.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/base/base.h>
static GstBuffer *
make_fec_sample (guint16 seq, guint32 ts, guint16 seq_base, gboolean row,
guint8 offset, guint8 NA, guint32 ts_recovery, guint8 * fec_payload,
guint fec_payload_len, guint16 length_recovery)
{
GstBuffer *ret;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GstBitWriter bits;
guint8 *data;
ret = gst_rtp_buffer_new_allocate (16 + fec_payload_len, 0, 0);
fail_unless (gst_rtp_buffer_map (ret, GST_MAP_WRITE, &rtp));
data = gst_rtp_buffer_get_payload (&rtp);
memset (data, 0x00, 16);
gst_bit_writer_init_with_data (&bits, data, 17, FALSE);
gst_bit_writer_put_bits_uint16 (&bits, seq_base, 16); /* SNBase low bits */
gst_bit_writer_put_bits_uint16 (&bits, length_recovery, 16); /* Length Recovery */
gst_bit_writer_put_bits_uint8 (&bits, 1, 1); /* E */
gst_bit_writer_put_bits_uint8 (&bits, 0x21, 7); /* PT recovery */
gst_bit_writer_put_bits_uint32 (&bits, 0, 24); /* Mask */
gst_bit_writer_put_bits_uint32 (&bits, ts_recovery, 32); /* TS recovery */
gst_bit_writer_put_bits_uint8 (&bits, 0, 1); /* N */
gst_bit_writer_put_bits_uint8 (&bits, row ? 1 : 0, 1); /* D */
gst_bit_writer_put_bits_uint8 (&bits, 0, 3); /* type */
gst_bit_writer_put_bits_uint8 (&bits, 0, 3); /* index */
gst_bit_writer_put_bits_uint8 (&bits, offset, 8); /* Offset */
gst_bit_writer_put_bits_uint8 (&bits, NA, 8); /* NA */
gst_bit_writer_put_bits_uint8 (&bits, 0, 8); /* SNBase ext bits */
memcpy (data + 16, fec_payload, fec_payload_len);
gst_bit_writer_reset (&bits);
GST_MEMDUMP ("fec", data, 16 + fec_payload_len);
gst_rtp_buffer_set_payload_type (&rtp, 96);
gst_rtp_buffer_set_seq (&rtp, seq);
gst_rtp_buffer_set_timestamp (&rtp, ts);
gst_rtp_buffer_unmap (&rtp);
return ret;
}
static GstBuffer *
make_media_sample (guint16 seq, guint32 ts, guint8 * payload, guint payload_len)
{
GstBuffer *ret;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
guint8 *data;
ret = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
gst_rtp_buffer_map (ret, GST_MAP_WRITE, &rtp);
gst_rtp_buffer_set_payload_type (&rtp, 33);
gst_rtp_buffer_set_seq (&rtp, seq);
gst_rtp_buffer_set_timestamp (&rtp, ts);
data = gst_rtp_buffer_get_payload (&rtp);
memcpy (data, payload, payload_len);
gst_rtp_buffer_unmap (&rtp);
return ret;
}
static void
pull_and_check (GstHarness * h, guint16 seq, guint32 ts, guint8 * payload,
guint payload_len, guint n_in_queue)
{
GstBuffer *buffer;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
guint8 *data;
guint i;
fail_unless_equals_int (gst_harness_buffers_in_queue (h), n_in_queue);
buffer = gst_harness_pull (h);
fail_unless (gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp));
fail_unless_equals_int (gst_rtp_buffer_get_seq (&rtp), seq);
fail_unless_equals_int (gst_rtp_buffer_get_timestamp (&rtp), ts);
fail_unless_equals_int (gst_rtp_buffer_get_payload_type (&rtp), 33);
fail_unless_equals_int (gst_rtp_buffer_get_payload_len (&rtp), payload_len);
data = gst_rtp_buffer_get_payload (&rtp);
for (i = 0; i < payload_len; i++)
fail_unless_equals_int (data[i], payload[i]);
gst_rtp_buffer_unmap (&rtp);
gst_buffer_unref (buffer);
}
/**
* +--------------+
* | 9 | 10 | x | l1
* | 12 | 13 | x | l2
* | x | x | x |
* +--------------+
* x x x
*
* Missing values:
* 11: 0xc5
* 14: 0xb8
*/
GST_START_TEST (test_row)
{
guint8 payload;
GstHarness *h =
gst_harness_new_with_padnames ("rtpst2022-1-fecdec", NULL, "src");
GstHarness *h0 = gst_harness_new_with_element (h->element, "sink", NULL);
GstHarness *h_fec_1 =
gst_harness_new_with_element (h->element, "fec_1", NULL);
gst_harness_set_src_caps_str (h0, "application/x-rtp");
gst_harness_set_src_caps_str (h_fec_1, "application/x-rtp");
payload = 0x37;
gst_harness_push (h0, make_media_sample (9, 0, &payload, 1));
payload = 0x28;
gst_harness_push (h0, make_media_sample (10, 0, &payload, 1));
payload = 0xff;
gst_harness_push (h0, make_media_sample (12, 0, &payload, 1));
/* We receive 9, 10 and 12 */
fail_unless_equals_int (gst_harness_buffers_in_queue (h), 3);
while (gst_harness_buffers_in_queue (h)) {
gst_buffer_unref (gst_harness_pull (h));
}
payload = 0xda;
gst_harness_push (h_fec_1, make_fec_sample (0, 0, 9, TRUE, 1, 3, 0, &payload,
1, 1));
/* After pushing l1, we should have enough info to reconstruct 11 */
payload = 0xc5;
pull_and_check (h, 11, 0, &payload, 1, 1);
/* Now we try to push l2 before 13, to verify that 14 is eventually
* reconstructed once 13 is pushed */
payload = 0x02;
gst_harness_push (h_fec_1, make_fec_sample (1, 0, 12, TRUE, 1, 3, 0, &payload,
1, 1));
fail_unless_equals_int (gst_harness_buffers_in_queue (h), 0);
payload = 0x45;
gst_harness_push (h0, make_media_sample (13, 0, &payload, 1));
fail_unless_equals_int (gst_harness_buffers_in_queue (h), 2);
payload = 0xb8;
pull_and_check (h, 14, 0, &payload, 1, 2);
payload = 0x45;
pull_and_check (h, 13, 0, &payload, 1, 1);
gst_harness_teardown (h);
gst_harness_teardown (h0);
gst_harness_teardown (h_fec_1);
}
GST_END_TEST;
/**
* +--------------+
* | 7 | 8 | x | x
* | 10 | 11 | x | x
* | x | x | x |
* +--------------+
* d1 d2 x
*
* Missing values:
* 13: 0xc5
* 14: 0x51
*/
GST_START_TEST (test_column)
{
guint8 payload;
GstHarness *h =
gst_harness_new_with_padnames ("rtpst2022-1-fecdec", NULL, "src");
GstHarness *h0 = gst_harness_new_with_element (h->element, "sink", NULL);
GstHarness *h_fec_0 =
gst_harness_new_with_element (h->element, "fec_0", NULL);
gst_harness_set_src_caps_str (h0, "application/x-rtp");
gst_harness_set_src_caps_str (h_fec_0, "application/x-rtp");
payload = 0x37;
gst_harness_push (h0, make_media_sample (7, 0, &payload, 1));
payload = 0x28;
gst_harness_push (h0, make_media_sample (10, 0, &payload, 1));
fail_unless_equals_int (gst_harness_buffers_in_queue (h), 2);
while (gst_harness_buffers_in_queue (h))
gst_buffer_unref (gst_harness_pull (h));
payload = 0xda;
gst_harness_push (h_fec_0, make_fec_sample (0, 0, 7, FALSE, 3, 3, 0, &payload,
1, 1));
/* After pushing d1, we should have enough info to reconstruct 13 */
payload = 0xc5;
pull_and_check (h, 13, 0, &payload, 1, 1);
/* Now we try to push d2 before 8 and 11, to verify that 14 is eventually
* reconstructed once 11 is pushed */
payload = 0x04;
gst_harness_push (h_fec_0, make_fec_sample (1, 0, 8, FALSE, 3, 3, 0, &payload,
1, 1));
payload = 0x21;
gst_harness_push (h0, make_media_sample (8, 0, &payload, 1));
fail_unless_equals_int (gst_harness_buffers_in_queue (h), 1);
while (gst_harness_buffers_in_queue (h))
gst_buffer_unref (gst_harness_pull (h));
payload = 0x74;
gst_harness_push (h0, make_media_sample (11, 0, &payload, 1));
payload = 0x51;
pull_and_check (h, 14, 0, &payload, 1, 2);
payload = 0x74;
pull_and_check (h, 11, 0, &payload, 1, 1);
gst_harness_teardown (h);
gst_harness_teardown (h0);
gst_harness_teardown (h_fec_0);
}
GST_END_TEST;
/*
* +-----------+
* | 0 | 1 | x | x
* | 3 | 4 | x | l1
* | 6 | x | x | l2
* +-----------+
* d0 d1 d2
*
* We should be able to retrieve 2 by retrieving 5 7 and 8 first.
*
* Missing values:
* 2: 0xfc
* 5: 0x3a
* 7: 0x5f
* 8: 0x21
*/
GST_START_TEST (test_2d)
{
guint8 payload;
GstHarness *h =
gst_harness_new_with_padnames ("rtpst2022-1-fecdec", NULL, "src");
GstHarness *h0 = gst_harness_new_with_element (h->element, "sink", NULL);
GstHarness *h_fec_0 =
gst_harness_new_with_element (h->element, "fec_0", NULL);
GstHarness *h_fec_1 =
gst_harness_new_with_element (h->element, "fec_1", NULL);
gst_harness_set_src_caps_str (h0, "application/x-rtp");
gst_harness_set_src_caps_str (h_fec_0, "application/x-rtp");
gst_harness_set_src_caps_str (h_fec_1, "application/x-rtp");
payload = 0xde;
gst_harness_push (h0, make_media_sample (0, 0, &payload, 1));
payload = 0xad;
gst_harness_push (h0, make_media_sample (1, 0, &payload, 1));
payload = 0xbe;
gst_harness_push (h0, make_media_sample (3, 0, &payload, 1));
payload = 0xef;
gst_harness_push (h0, make_media_sample (4, 0, &payload, 1));
payload = 0x42;
gst_harness_push (h0, make_media_sample (6, 0, &payload, 1));
/* row FEC */
/* l1 0xbe ^ 0xef ^ 0x3a */
payload = 0x6b;
gst_harness_push (h_fec_1, make_fec_sample (0, 0, 3, TRUE, 1, 3, 0, &payload,
1, 1));
/* l2 0x42 ^ 0x5f ^ 0x21 */
payload = 0x3c;
gst_harness_push (h_fec_1, make_fec_sample (0, 0, 6, TRUE, 1, 3, 0, &payload,
1, 1));
/* column FEC */
/* d0 0xde ^ 0xbe ^ 0x42 */
payload = 0x22;
gst_harness_push (h_fec_0, make_fec_sample (0, 0, 0, FALSE, 3, 3, 0, &payload,
1, 1));
/* d1 0xad ^ 0xef ^ 0x5f */
payload = 0x1d;
gst_harness_push (h_fec_0, make_fec_sample (1, 0, 1, FALSE, 3, 3, 0, &payload,
1, 1));
/* d2 0xfc ^ 0x3a ^ 0x21 */
payload = 0xe7;
gst_harness_push (h_fec_0, make_fec_sample (2, 0, 2, FALSE, 3, 3, 0, &payload,
1, 1));
/* We should retrieve all 9 packets despite dropping 4! */
payload = 0xde;
pull_and_check (h, 0, 0, &payload, 1, 9);
payload = 0xad;
pull_and_check (h, 1, 0, &payload, 1, 8);
payload = 0xbe;
pull_and_check (h, 3, 0, &payload, 1, 7);
payload = 0xef;
pull_and_check (h, 4, 0, &payload, 1, 6);
payload = 0x42;
pull_and_check (h, 6, 0, &payload, 1, 5);
payload = 0x3a;
pull_and_check (h, 5, 0, &payload, 1, 4);
payload = 0x21;
pull_and_check (h, 8, 0, &payload, 1, 3);
payload = 0x5f;
pull_and_check (h, 7, 0, &payload, 1, 2);
payload = 0xfc;
pull_and_check (h, 2, 0, &payload, 1, 1);
gst_harness_teardown (h);
gst_harness_teardown (h0);
gst_harness_teardown (h_fec_0);
gst_harness_teardown (h_fec_1);
}
GST_END_TEST;
static void
_xor_mem (guint8 * restrict dst, const guint8 * restrict src, gsize length)
{
guint i;
for (i = 0; i < (length / sizeof (guint64)); ++i) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
GST_WRITE_UINT64_LE (dst,
GST_READ_UINT64_LE (dst) ^ GST_READ_UINT64_LE (src));
#else
GST_WRITE_UINT64_BE (dst,
GST_READ_UINT64_BE (dst) ^ GST_READ_UINT64_BE (src));
#endif
dst += sizeof (guint64);
src += sizeof (guint64);
}
for (i = 0; i < (length % sizeof (guint64)); ++i)
dst[i] ^= src[i];
}
/**
* +-----------------+
* | 0-1 | 1-3 | x-4 | l1
* +-----------------+
* x x x
*
* Missing values:
* 2: 0xc5b74108
*/
GST_START_TEST (test_variable_length)
{
guint8 payload[4];
guint8 fec_payload[4];
GstHarness *h =
gst_harness_new_with_padnames ("rtpst2022-1-fecdec", NULL, "src");
GstHarness *h0 = gst_harness_new_with_element (h->element, "sink", NULL);
GstHarness *h_fec_1 =
gst_harness_new_with_element (h->element, "fec_1", NULL);
gst_harness_set_src_caps_str (h0, "application/x-rtp");
gst_harness_set_src_caps_str (h_fec_1, "application/x-rtp");
memset (fec_payload, 0x00, 4);
payload[0] = 0x37;
_xor_mem (fec_payload, payload, 1);
gst_harness_push (h0, make_media_sample (0, 0, payload, 1));
payload[0] = 0x28;
payload[1] = 0x39;
payload[2] = 0x56;
_xor_mem (fec_payload, payload, 3);
gst_harness_push (h0, make_media_sample (1, 0, payload, 3));
/* We receive 0 and 1 */
fail_unless_equals_int (gst_harness_buffers_in_queue (h), 2);
while (gst_harness_buffers_in_queue (h)) {
gst_buffer_unref (gst_harness_pull (h));
}
payload[0] = 0xc5;
payload[1] = 0xb7;
payload[2] = 0x41;
payload[3] = 0x08;
_xor_mem (fec_payload, payload, 4);
gst_harness_push (h_fec_1, make_fec_sample (0, 0, 0, TRUE, 1, 3, 0,
fec_payload, 4, 1 ^ 3 ^ 4));
pull_and_check (h, 2, 0, payload, 4, 1);
gst_harness_teardown (h);
gst_harness_teardown (h0);
gst_harness_teardown (h_fec_1);
}
GST_END_TEST;
static Suite *
st2022_1_dec_suite (void)
{
Suite *s = suite_create ("rtpst2022-1-fecdec");
TCase *tc_chain = tcase_create ("general");
suite_add_tcase (s, tc_chain);
tcase_add_test (tc_chain, test_row);
tcase_add_test (tc_chain, test_column);
tcase_add_test (tc_chain, test_2d);
tcase_add_test (tc_chain, test_variable_length);
return s;
}
GST_CHECK_MAIN (st2022_1_dec)

1
tests/check/meson.build
View file

@ -88,6 +88,7 @@ good_tests = [
[ 'elements/rtpulpfec' ],
[ 'elements/rtpssrcdemux' ],
[ 'elements/rtp-payloading' ],
[ 'elements/rtpst2022-1-fecdec' ],
[ 'elements/spectrum', false, [gstfft_dep] ],
[ 'elements/shapewipe' ],
[ 'elements/udpsink' ],