gstreamer/gst/rtpmanager/gstrtpst2022-1-fecenc.c

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/* 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-fecenc
* @see_also: #element-rtpst2022-1-fecdec
*
* 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.
*
* ## 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-fecenc.h"
#if !GLIB_CHECK_VERSION(2, 60, 0)
#define g_queue_clear_full queue_clear_full
static void
queue_clear_full (GQueue * queue, GDestroyNotify free_func)
{
gpointer data;
while ((data = g_queue_pop_head (queue)) != NULL)
free_func (data);
}
#endif
GST_DEBUG_CATEGORY_STATIC (gst_rtpst_2022_1_fecenc_debug);
#define GST_CAT_DEFAULT gst_rtpst_2022_1_fecenc_debug
enum
{
PROP_0,
PROP_COLUMNS,
PROP_ROWS,
PROP_PT,
PROP_ENABLE_COLUMN,
PROP_ENABLE_ROW,
};
#define DEFAULT_ROWS 0
#define DEFAULT_COLUMNS 0
#define DEFAULT_PT 96
#define DEFAULT_ENABLE_COLUMN TRUE
#define DEFAULT_ENABLE_ROW TRUE
typedef struct
{
guint16 target_media_seq; /* The media seqnum we want to send that packet alongside */
guint16 seq_base; /* Only used for logging purposes */
GstBuffer *buffer;
} Item;
typedef struct
{
guint8 *xored_payload;
guint32 xored_timestamp;
guint8 xored_pt;
guint16 xored_payload_len;
guint16 seq_base;
guint16 payload_len;
guint n_packets;
} FecPacket;
struct _GstRTPST_2022_1_FecEncClass
{
GstElementClass class;
};
struct _GstRTPST_2022_1_FecEnc
{
GstElement element;
GstPad *srcpad;
GstPad *sinkpad;
/* These pads do not participate in the flow return of the element,
* which should continue working even if the sending of FEC packets
* fails
*/
GstPad *row_fec_srcpad;
GstPad *column_fec_srcpad;
/* The following fields are only accessed on state change or from the
* streaming thread, and only settable in state < PAUSED */
/* N columns */
guint l;
/* N rows */
guint d;
/* Whether we have pushed initial events on the column FEC source pad */
gboolean column_events_pushed;
/* The current row FEC packet */
FecPacket *row;
/* Tracks the row seqnum */
guint16 row_seq;
/* Whether we have pushed initial events on the row FEC source pad */
gboolean row_events_pushed;
/* These two fields are used to enforce input seqnum consecutiveness,
* and to determine when column FEC packets should be pushed */
gboolean last_media_seqnum_set;
guint16 last_media_seqnum;
/* This field is used to timestamp our FEC packets, we just piggy back */
guint32 last_media_timestamp;
/* The payload type of the FEC packets */
gint pt;
/* The following fields can be changed while PLAYING, and are
* protected with the OBJECT_LOCK
*/
/* Tracks the property, can be changed while PLAYING */
gboolean enable_row;
/* Tracks the property, can be changed while PLAYING */
gboolean enable_column;
/* Array of FecPackets, with size enc->l */
GPtrArray *columns;
/* Index of the current column in the array above */
guint current_column;
/* Tracks the column seqnum */
guint16 column_seq;
/* Column FEC packets must be delayed to make them more resilient
* to loss bursts, we store them here */
GQueue queued_column_packets;
};
#define RTP_CAPS "application/x-rtp"
static GstStaticPadTemplate fec_src_template =
GST_STATIC_PAD_TEMPLATE ("fec_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
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_fecenc_parent_class parent_class
G_DEFINE_TYPE (GstRTPST_2022_1_FecEnc, gst_rtpst_2022_1_fecenc,
GST_TYPE_ELEMENT);
static void
free_item (Item * item)
{
if (item->buffer)
gst_buffer_unref (item->buffer);
g_free (item);
}
static void
free_fec_packet (FecPacket * packet)
{
if (packet->xored_payload)
g_free (packet->xored_payload);
g_free (packet);
}
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 void
fec_packet_update (FecPacket * fec, GstRTPBuffer * rtp)
{
if (fec->n_packets == 0) {
fec->seq_base = gst_rtp_buffer_get_seq (rtp);
fec->payload_len = gst_rtp_buffer_get_payload_len (rtp);
fec->xored_payload_len = gst_rtp_buffer_get_payload_len (rtp);
fec->xored_pt = gst_rtp_buffer_get_payload_type (rtp);
fec->xored_timestamp = gst_rtp_buffer_get_timestamp (rtp);
fec->xored_payload = g_malloc (sizeof (guint8) * fec->payload_len);
memcpy (fec->xored_payload, gst_rtp_buffer_get_payload (rtp),
fec->payload_len);
} else {
if (fec->payload_len < gst_rtp_buffer_get_payload_len (rtp)) {
fec->payload_len = gst_rtp_buffer_get_payload_len (rtp);
fec->xored_payload =
g_realloc (fec->xored_payload, sizeof (guint8) * fec->payload_len);
}
fec->xored_payload_len ^= gst_rtp_buffer_get_payload_len (rtp);
fec->xored_pt ^= gst_rtp_buffer_get_payload_type (rtp);
fec->xored_timestamp ^= gst_rtp_buffer_get_timestamp (rtp);
_xor_mem (fec->xored_payload, gst_rtp_buffer_get_payload (rtp),
gst_rtp_buffer_get_payload_len (rtp));
}
fec->n_packets += 1;
}
static void
push_initial_events (GstRTPST_2022_1_FecEnc * enc, GstPad * pad,
const gchar * id)
{
gchar *stream_id;
GstCaps *caps;
GstSegment segment;
stream_id = gst_pad_create_stream_id (pad, GST_ELEMENT (enc), id);
gst_pad_push_event (pad, gst_event_new_stream_start (stream_id));
g_free (stream_id);
caps = gst_caps_new_simple ("application/x-rtp",
"payload", G_TYPE_UINT, enc->pt, "ssrc", G_TYPE_UINT, 0, NULL);
gst_pad_push_event (pad, gst_event_new_caps (caps));
gst_caps_unref (caps);
gst_segment_init (&segment, GST_FORMAT_TIME);
gst_pad_push_event (pad, gst_event_new_segment (&segment));
}
static void
queue_fec_packet (GstRTPST_2022_1_FecEnc * enc, FecPacket * fec, gboolean row)
{
GstBuffer *buffer = gst_rtp_buffer_new_allocate (fec->payload_len + 16, 0, 0);
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
GstBitWriter bits;
guint8 *data;
gst_rtp_buffer_map (buffer, 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, fec->seq_base, 16); /* SNBase low bits */
gst_bit_writer_put_bits_uint16 (&bits, fec->xored_payload_len, 16); /* Length Recovery */
gst_bit_writer_put_bits_uint8 (&bits, 1, 1); /* E */
gst_bit_writer_put_bits_uint8 (&bits, fec->xored_pt, 7); /* PT recovery */
gst_bit_writer_put_bits_uint32 (&bits, 0, 24); /* Mask */
gst_bit_writer_put_bits_uint32 (&bits, fec->xored_timestamp, 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, row ? 1 : enc->l, 8); /* Offset */
gst_bit_writer_put_bits_uint8 (&bits, fec->n_packets, 8); /* NA */
gst_bit_writer_put_bits_uint8 (&bits, 0, 8); /* SNBase ext bits */
memcpy (data + 16, fec->xored_payload, fec->payload_len);
gst_bit_writer_reset (&bits);
gst_rtp_buffer_set_payload_type (&rtp, enc->pt);
gst_rtp_buffer_set_seq (&rtp, row ? enc->row_seq++ : enc->column_seq++);
/* We're sending it out immediately */
if (row)
gst_rtp_buffer_set_timestamp (&rtp, enc->last_media_timestamp);
gst_rtp_buffer_unmap (&rtp);
/* We can send row FEC packets immediately, column packets need
* delaying by L <= delay < L * D
*/
if (row) {
GstFlowReturn ret;
GST_LOG_OBJECT (enc,
"Pushing row FEC packet, seq base: %u, media seqnum: %u",
fec->seq_base, enc->last_media_seqnum);
/* Safe to unlock here */
GST_OBJECT_UNLOCK (enc);
ret = gst_pad_push (enc->row_fec_srcpad, buffer);
GST_OBJECT_LOCK (enc);
if (ret != GST_FLOW_OK && ret != GST_FLOW_FLUSHING)
GST_WARNING_OBJECT (enc->row_fec_srcpad,
"Failed to push row FEC packet: %s", gst_flow_get_name (ret));
} else {
Item *item = g_malloc0 (sizeof (Item));
item->buffer = buffer;
item->seq_base = fec->seq_base;
/* Let's get cute and linearize */
item->target_media_seq =
enc->last_media_seqnum + enc->l - enc->current_column +
enc->d * enc->current_column;
g_queue_push_tail (&enc->queued_column_packets, item);
}
}
static GstFlowReturn
gst_rtpst_2022_1_fecenc_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstRTPST_2022_1_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (parent);
GstFlowReturn ret = GST_FLOW_OK;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
if (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp)) {
GST_ERROR_OBJECT (enc, "Chained buffer isn't valid RTP");
goto error;
}
if (gst_rtp_buffer_get_ssrc (&rtp) != 0) {
GST_ERROR_OBJECT (enc, "Chained buffer must have SSRC == 0");
goto error;
}
if (enc->last_media_seqnum_set
&& (guint16) (enc->last_media_seqnum + 1) !=
gst_rtp_buffer_get_seq (&rtp)) {
GST_ERROR_OBJECT (enc, "consecutive sequence numbers are required");
goto error;
}
if (!enc->row_events_pushed) {
push_initial_events (enc, enc->row_fec_srcpad, "row-fec");
enc->row_events_pushed = TRUE;
}
if (!enc->column_events_pushed) {
push_initial_events (enc, enc->column_fec_srcpad, "column-fec");
enc->column_events_pushed = TRUE;
}
enc->last_media_timestamp = gst_rtp_buffer_get_timestamp (&rtp);
enc->last_media_seqnum = gst_rtp_buffer_get_seq (&rtp);
enc->last_media_seqnum_set = TRUE;
GST_OBJECT_LOCK (enc);
if (enc->enable_row && enc->l) {
g_assert (enc->row->n_packets < enc->l);
fec_packet_update (enc->row, &rtp);
if (enc->row->n_packets == enc->l) {
queue_fec_packet (enc, enc->row, TRUE);
g_free (enc->row->xored_payload);
memset (enc->row, 0x00, sizeof (FecPacket));
}
}
if (enc->enable_column && enc->l && enc->d) {
FecPacket *column = g_ptr_array_index (enc->columns, enc->current_column);
fec_packet_update (column, &rtp);
if (column->n_packets == enc->d) {
queue_fec_packet (enc, column, FALSE);
g_free (column->xored_payload);
memset (column, 0x00, sizeof (FecPacket));
}
enc->current_column++;
enc->current_column %= enc->l;
}
gst_rtp_buffer_unmap (&rtp);
if (g_queue_get_length (&enc->queued_column_packets) > 0) {
Item *item = g_queue_peek_head (&enc->queued_column_packets);
if (item->target_media_seq == enc->last_media_seqnum) {
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
g_queue_pop_head (&enc->queued_column_packets);
GST_LOG_OBJECT (enc,
"Pushing column FEC packet, seq base: %u, media seqnum: %u",
item->seq_base, enc->last_media_seqnum);
gst_rtp_buffer_map (item->buffer, GST_MAP_WRITE, &rtp);
gst_rtp_buffer_set_timestamp (&rtp, enc->last_media_timestamp);
gst_rtp_buffer_unmap (&rtp);
GST_OBJECT_UNLOCK (enc);
ret =
gst_pad_push (enc->column_fec_srcpad, gst_buffer_ref (item->buffer));
GST_OBJECT_LOCK (enc);
if (ret != GST_FLOW_OK && ret != GST_FLOW_FLUSHING)
GST_WARNING_OBJECT (enc->column_fec_srcpad,
"Failed to push column FEC packet: %s", gst_flow_get_name (ret));
free_item (item);
}
}
GST_OBJECT_UNLOCK (enc);
ret = gst_pad_push (enc->srcpad, buffer);
done:
return ret;
error:
if (rtp.buffer)
gst_rtp_buffer_unmap (&rtp);
gst_buffer_unref (buffer);
ret = GST_FLOW_ERROR;
goto done;
}
static GstIterator *
gst_rtpst_2022_1_fecenc_iterate_linked_pads (GstPad * pad, GstObject * parent)
{
GstRTPST_2022_1_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (parent);
GstPad *otherpad = NULL;
GstIterator *it = NULL;
GValue val = { 0, };
if (pad == enc->srcpad)
otherpad = enc->sinkpad;
else if (pad == enc->sinkpad)
otherpad = enc->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 void
gst_rtpst_2022_1_fecenc_reset (GstRTPST_2022_1_FecEnc * enc, gboolean allocate)
{
if (enc->row) {
free_fec_packet (enc->row);
enc->row = NULL;
}
if (enc->columns) {
g_ptr_array_unref (enc->columns);
enc->columns = NULL;
}
if (enc->row_fec_srcpad) {
gst_element_remove_pad (GST_ELEMENT (enc), enc->row_fec_srcpad);
enc->row_fec_srcpad = NULL;
}
if (enc->column_fec_srcpad) {
gst_element_remove_pad (GST_ELEMENT (enc), enc->column_fec_srcpad);
enc->column_fec_srcpad = NULL;
}
g_queue_clear_full (&enc->queued_column_packets, (GDestroyNotify) free_item);
if (allocate) {
guint i;
enc->row = g_malloc0 (sizeof (FecPacket));
enc->columns =
g_ptr_array_new_full (enc->l, (GDestroyNotify) free_fec_packet);
for (i = 0; i < enc->l; i++) {
g_ptr_array_add (enc->columns, g_malloc0 (sizeof (FecPacket)));
}
g_queue_init (&enc->queued_column_packets);
enc->column_fec_srcpad =
gst_pad_new_from_static_template (&fec_src_template, "fec_0");
gst_pad_set_active (enc->column_fec_srcpad, TRUE);
gst_pad_set_iterate_internal_links_function (enc->column_fec_srcpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_iterate_linked_pads));
gst_element_add_pad (GST_ELEMENT (enc), enc->column_fec_srcpad);
enc->row_fec_srcpad =
gst_pad_new_from_static_template (&fec_src_template, "fec_1");
gst_pad_set_active (enc->row_fec_srcpad, TRUE);
gst_pad_set_iterate_internal_links_function (enc->row_fec_srcpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_iterate_linked_pads));
gst_element_add_pad (GST_ELEMENT (enc), enc->row_fec_srcpad);
gst_element_no_more_pads (GST_ELEMENT (enc));
}
enc->current_column = 0;
enc->last_media_seqnum_set = FALSE;
}
static GstStateChangeReturn
gst_rtpst_2022_1_fecenc_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret;
GstRTPST_2022_1_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtpst_2022_1_fecenc_reset (enc, TRUE);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtpst_2022_1_fecenc_reset (enc, FALSE);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return ret;
}
static void
gst_rtpst_2022_1_fecenc_finalize (GObject * object)
{
GstRTPST_2022_1_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (object);
gst_rtpst_2022_1_fecenc_reset (enc, FALSE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_rtpst_2022_1_fecenc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRTPST_2022_1_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (object);
if (GST_STATE (enc) > GST_STATE_READY) {
GST_ERROR_OBJECT (enc,
"rtpst2022-1-fecenc properties can't be changed in PLAYING or PAUSED state");
return;
}
switch (prop_id) {
case PROP_COLUMNS:
enc->l = g_value_get_uint (value);
break;
case PROP_ROWS:
enc->d = g_value_get_uint (value);
break;
case PROP_PT:
enc->pt = g_value_get_int (value);
break;
case PROP_ENABLE_COLUMN:
GST_OBJECT_LOCK (enc);
enc->enable_column = g_value_get_boolean (value);
if (!enc->enable_column) {
guint i;
if (enc->columns) {
for (i = 0; i < enc->l; i++) {
FecPacket *column = g_ptr_array_index (enc->columns, i);
g_free (column->xored_payload);
memset (column, 0x00, sizeof (FecPacket));
}
}
enc->current_column = 0;
enc->column_seq = 0;
g_queue_clear_full (&enc->queued_column_packets,
(GDestroyNotify) free_item);
}
GST_OBJECT_UNLOCK (enc);
break;
case PROP_ENABLE_ROW:
GST_OBJECT_LOCK (enc);
enc->enable_row = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (enc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtpst_2022_1_fecenc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRTPST_2022_1_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (object);
switch (prop_id) {
case PROP_COLUMNS:
g_value_set_uint (value, enc->l);
break;
case PROP_ROWS:
g_value_set_uint (value, enc->d);
break;
case PROP_PT:
g_value_set_int (value, enc->pt);
break;
case PROP_ENABLE_COLUMN:
GST_OBJECT_LOCK (enc);
g_value_set_boolean (value, enc->enable_column);
GST_OBJECT_UNLOCK (enc);
break;
case PROP_ENABLE_ROW:
GST_OBJECT_LOCK (enc);
g_value_set_boolean (value, enc->enable_row);
GST_OBJECT_UNLOCK (enc);
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_FecEnc *enc = GST_RTPST_2022_1_FECENC_CAST (parent);
gboolean ret;
if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP)
gst_rtpst_2022_1_fecenc_reset (enc, TRUE);
ret = gst_pad_event_default (pad, parent, event);
return ret;
}
static void
gst_rtpst_2022_1_fecenc_class_init (GstRTPST_2022_1_FecEncClass * 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_fecenc_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_get_property);
gobject_class->finalize =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_finalize);
g_object_class_install_property (gobject_class, PROP_COLUMNS,
g_param_spec_uint ("columns", "Columns",
"Number of columns to apply row FEC on, 0=disabled", 0,
255, DEFAULT_COLUMNS,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (gobject_class, PROP_ROWS,
g_param_spec_uint ("rows", "Rows",
"Number of rows to apply column FEC on, 0=disabled", 0,
255, DEFAULT_ROWS,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (gobject_class, PROP_PT,
g_param_spec_int ("pt", "Payload Type",
"The payload type of FEC packets", 96,
255, DEFAULT_PT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (gobject_class, PROP_ENABLE_COLUMN,
g_param_spec_boolean ("enable-column-fec", "Enable Column FEC",
"Whether the encoder should compute and send column FEC",
DEFAULT_ENABLE_COLUMN,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_PLAYING));
g_object_class_install_property (gobject_class, PROP_ENABLE_ROW,
g_param_spec_boolean ("enable-row-fec", "Enable Row FEC",
"Whether the encoder should compute and send row FEC",
DEFAULT_ENABLE_ROW,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_PLAYING));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_change_state);
gst_element_class_set_static_metadata (gstelement_class,
"SMPTE 2022-1 FEC encoder", "SMPTE 2022-1 FEC encoding",
"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_src_template);
gst_element_class_add_static_pad_template (gstelement_class, &src_template);
GST_DEBUG_CATEGORY_INIT (gst_rtpst_2022_1_fecenc_debug,
"rtpst2022-1-fecenc", 0, "SMPTE 2022-1 FEC encoder element");
}
static void
gst_rtpst_2022_1_fecenc_init (GstRTPST_2022_1_FecEnc * enc)
{
enc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_use_fixed_caps (enc->srcpad);
GST_PAD_SET_PROXY_CAPS (enc->srcpad);
gst_pad_set_iterate_internal_links_function (enc->srcpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_iterate_linked_pads));
gst_element_add_pad (GST_ELEMENT (enc), enc->srcpad);
enc->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
GST_PAD_SET_PROXY_CAPS (enc->sinkpad);
gst_pad_set_chain_function (enc->sinkpad, gst_rtpst_2022_1_fecenc_sink_chain);
gst_pad_set_event_function (enc->sinkpad,
GST_DEBUG_FUNCPTR (gst_2d_fec_sink_event));
gst_pad_set_iterate_internal_links_function (enc->sinkpad,
GST_DEBUG_FUNCPTR (gst_rtpst_2022_1_fecenc_iterate_linked_pads));
gst_element_add_pad (GST_ELEMENT (enc), enc->sinkpad);
enc->d = 0;
enc->l = 0;
}