gstreamer/gst/rtpmanager/gstrtpst2022-1-fecdec.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-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;
gboolean marker;
gboolean padding;
gboolean extension;
} 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 (GstRTPBuffer * rtp, Rtp2DFecHeader * fec)
{
gboolean ret = FALSE;
GstBitReader bits;
guint8 *data = gst_rtp_buffer_get_payload (rtp);
guint len = gst_rtp_buffer_get_payload_len (rtp);
if (len < 16)
goto done;
gst_bit_reader_init (&bits, data, len);
fec->marker = gst_rtp_buffer_get_marker (rtp);
fec->padding = gst_rtp_buffer_get_padding (rtp);
fec->extension = gst_rtp_buffer_get_extension (rtp);
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;
gboolean xored_marker;
gboolean xored_padding;
gboolean xored_extension;
/* 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;
xored_marker = fec->marker;
xored_padding = fec->padding;
xored_extension = fec->extension;
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),
MIN (gst_rtp_buffer_get_payload_len (&media_rtp), xored_payload_len));
xored_timestamp ^= gst_rtp_buffer_get_timestamp (&media_rtp);
xored_pt ^= gst_rtp_buffer_get_payload_type (&media_rtp);
xored_marker ^= gst_rtp_buffer_get_marker (&media_rtp);
xored_padding ^= gst_rtp_buffer_get_padding (&media_rtp);
xored_extension ^= gst_rtp_buffer_get_extension (&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_set_marker (&rtp, xored_marker);
gst_rtp_buffer_set_padding (&rtp, xored_padding);
gst_rtp_buffer_set_extension (&rtp, xored_extension);
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;
GstFlowReturn ret;
gst_rtp_buffer_map (item->buffer, GST_MAP_READ, &rtp);
parse_header (&rtp, &fec);
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 (&rtp, &fec)) {
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;
}