mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-09 05:38:58 +00:00
718 lines
23 KiB
C
718 lines
23 KiB
C
/* GStreamer plugin for forward error correction
|
|
* Copyright (C) 2017 Pexip
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Author: Mikhail Fludkov <misha@pexip.com>
|
|
*/
|
|
|
|
/**
|
|
* SECTION:element-rtpulpfecdec
|
|
* @short_description: Generic RTP Forward Error Correction (FEC) decoder
|
|
* @title: rtpulpfecdec
|
|
*
|
|
* Generic Forward Error Correction (FEC) decoder for Uneven Level
|
|
* Protection (ULP) as described in RFC 5109.
|
|
*
|
|
* It differs from the RFC in one important way, it multiplexes the
|
|
* FEC packets in the same sequence number as media packets. This is to be
|
|
* compatible with libwebrtc as using in Google Chrome and with Microsoft
|
|
* Lync / Skype for Business.
|
|
*
|
|
* This element will work in combination with an upstream #GstRtpStorage
|
|
* element and attempt to recover packets declared lost through custom
|
|
* 'GstRTPPacketLost' events, usually emitted by #GstRtpJitterBuffer.
|
|
*
|
|
* If no storage is provided using the #GstRtpUlpFecDec:storage
|
|
* property, it will try to get it from an element upstream.
|
|
*
|
|
* Additionally, the payload types of the protection packets *must* be
|
|
* provided to this element via its #GstRtpUlpFecDec:pt property.
|
|
*
|
|
* When using #GstRtpBin, this element should be inserted through the
|
|
* #GstRtpBin::request-fec-decoder signal.
|
|
*
|
|
* ## Example pipeline
|
|
*
|
|
* |[
|
|
* gst-launch-1.0 udpsrc port=8888 caps="application/x-rtp, payload=96, clock-rate=90000" ! rtpstorage size-time=220000000 ! rtpssrcdemux ! application/x-rtp, payload=96, clock-rate=90000, media=video, encoding-name=H264 ! rtpjitterbuffer do-lost=1 latency=200 ! rtpulpfecdec pt=122 ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink
|
|
* ]| This example will receive a stream with FEC and try to reconstruct the packets.
|
|
*
|
|
* Example programs are available at
|
|
* <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/blob/master/examples/src/bin/rtpfecserver.rs>
|
|
* and
|
|
* <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/blob/master/examples/src/bin/rtpfecclient.rs>
|
|
*
|
|
* See also: #GstRtpUlpFecEnc, #GstRtpBin, #GstRtpStorage
|
|
* Since: 1.14
|
|
*/
|
|
|
|
#include <gst/rtp/gstrtpbuffer.h>
|
|
#include <gst/rtp/gstrtp-enumtypes.h>
|
|
|
|
#include "rtpulpfeccommon.h"
|
|
#include "gstrtpulpfecdec.h"
|
|
|
|
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
|
|
GST_PAD_SINK,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS ("application/x-rtp")
|
|
);
|
|
|
|
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
|
|
GST_PAD_SRC,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS ("application/x-rtp")
|
|
);
|
|
|
|
enum
|
|
{
|
|
PROP_0,
|
|
PROP_PT,
|
|
PROP_STORAGE,
|
|
PROP_RECOVERED,
|
|
PROP_UNRECOVERED,
|
|
N_PROPERTIES
|
|
};
|
|
|
|
#define DEFAULT_FEC_PT 0
|
|
|
|
static GParamSpec *klass_properties[N_PROPERTIES] = { NULL, };
|
|
|
|
GST_DEBUG_CATEGORY (gst_rtp_ulpfec_dec_debug);
|
|
#define GST_CAT_DEFAULT (gst_rtp_ulpfec_dec_debug)
|
|
|
|
G_DEFINE_TYPE (GstRtpUlpFecDec, gst_rtp_ulpfec_dec, GST_TYPE_ELEMENT);
|
|
|
|
#define RTP_FEC_MAP_INFO_NTH(dec, data) (&g_array_index (\
|
|
((GstRtpUlpFecDec *)dec)->info_arr, \
|
|
RtpUlpFecMapInfo, \
|
|
GPOINTER_TO_UINT(data)))
|
|
|
|
static gint
|
|
_compare_fec_map_info (gconstpointer a, gconstpointer b, gpointer userdata)
|
|
{
|
|
guint16 aseq =
|
|
gst_rtp_buffer_get_seq (&RTP_FEC_MAP_INFO_NTH (userdata, a)->rtp);
|
|
guint16 bseq =
|
|
gst_rtp_buffer_get_seq (&RTP_FEC_MAP_INFO_NTH (userdata, b)->rtp);
|
|
return gst_rtp_buffer_compare_seqnum (bseq, aseq);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_start (GstRtpUlpFecDec * self, GstBufferList * buflist,
|
|
guint8 fec_pt, guint16 lost_seq)
|
|
{
|
|
guint fec_packets = 0;
|
|
gsize i;
|
|
|
|
g_assert (NULL == self->info_media);
|
|
g_assert (0 == self->info_fec->len);
|
|
g_assert (0 == self->info_arr->len);
|
|
|
|
g_array_set_size (self->info_arr, gst_buffer_list_length (buflist));
|
|
|
|
for (i = 0;
|
|
i < gst_buffer_list_length (buflist) && !self->lost_packet_from_storage;
|
|
++i) {
|
|
GstBuffer *buffer = gst_buffer_list_get (buflist, i);
|
|
RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (self, i);
|
|
|
|
if (!rtp_ulpfec_map_info_map (gst_buffer_ref (buffer), info))
|
|
g_assert_not_reached ();
|
|
|
|
if (fec_pt == gst_rtp_buffer_get_payload_type (&info->rtp)) {
|
|
GST_DEBUG_RTP_PACKET (self, "rtp header (fec)", &info->rtp);
|
|
|
|
++fec_packets;
|
|
if (rtp_ulpfec_buffer_is_valid (&info->rtp)) {
|
|
GST_DEBUG_FEC_PACKET (self, &info->rtp);
|
|
g_ptr_array_add (self->info_fec, GUINT_TO_POINTER (i));
|
|
}
|
|
} else {
|
|
GST_LOG_RTP_PACKET (self, "rtp header (incoming)", &info->rtp);
|
|
|
|
if (lost_seq == gst_rtp_buffer_get_seq (&info->rtp)) {
|
|
GST_DEBUG_OBJECT (self, "Received lost packet from the storage");
|
|
g_list_free (self->info_media);
|
|
self->info_media = NULL;
|
|
self->lost_packet_from_storage = TRUE;
|
|
}
|
|
self->info_media =
|
|
g_list_insert_sorted_with_data (self->info_media,
|
|
GUINT_TO_POINTER (i), _compare_fec_map_info, self);
|
|
}
|
|
}
|
|
if (!self->lost_packet_from_storage) {
|
|
self->fec_packets_received += fec_packets;
|
|
self->fec_packets_rejected += fec_packets - self->info_fec->len;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_stop (GstRtpUlpFecDec * self)
|
|
{
|
|
g_array_set_size (self->info_arr, 0);
|
|
g_ptr_array_set_size (self->info_fec, 0);
|
|
g_list_free (self->info_media);
|
|
self->info_media = NULL;
|
|
self->lost_packet_from_storage = FALSE;
|
|
self->lost_packet_returned = FALSE;
|
|
}
|
|
|
|
static guint64
|
|
gst_rtp_ulpfec_dec_get_media_buffers_mask (GstRtpUlpFecDec * self,
|
|
guint16 fec_seq_base)
|
|
{
|
|
guint64 mask = 0;
|
|
GList *it;
|
|
|
|
for (it = self->info_media; it; it = it->next) {
|
|
RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (self, it->data);
|
|
mask |=
|
|
rtp_ulpfec_packet_mask_from_seqnum (gst_rtp_buffer_get_seq (&info->rtp),
|
|
fec_seq_base, TRUE);
|
|
}
|
|
return mask;
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_ulpfec_dec_is_recovered_pt_valid (GstRtpUlpFecDec * self, gint media_pt,
|
|
guint8 recovered_pt)
|
|
{
|
|
GList *it;
|
|
if (media_pt == recovered_pt)
|
|
return TRUE;
|
|
|
|
for (it = self->info_media; it; it = it->next) {
|
|
RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (self, it->data);
|
|
if (gst_rtp_buffer_get_payload_type (&info->rtp) == recovered_pt)
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_ulpfec_dec_recover_from_fec (GstRtpUlpFecDec * self,
|
|
RtpUlpFecMapInfo * info_fec, guint32 ssrc, gint media_pt, guint16 seq,
|
|
guint8 * dst_pt)
|
|
{
|
|
guint64 fec_mask = rtp_ulpfec_buffer_get_mask (&info_fec->rtp);
|
|
gboolean fec_mask_long = rtp_ulpfec_buffer_get_fechdr (&info_fec->rtp)->L;
|
|
guint16 fec_seq_base = rtp_ulpfec_buffer_get_seq_base (&info_fec->rtp);
|
|
GstBuffer *ret;
|
|
GList *it;
|
|
|
|
g_array_set_size (self->scratch_buf, 0);
|
|
rtp_buffer_to_ulpfec_bitstring (&info_fec->rtp, self->scratch_buf, TRUE,
|
|
fec_mask_long);
|
|
|
|
for (it = self->info_media; it; it = it->next) {
|
|
RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (self, it->data);
|
|
guint64 packet_mask =
|
|
rtp_ulpfec_packet_mask_from_seqnum (gst_rtp_buffer_get_seq (&info->rtp),
|
|
fec_seq_base, TRUE);
|
|
|
|
if (fec_mask & packet_mask) {
|
|
fec_mask ^= packet_mask;
|
|
rtp_buffer_to_ulpfec_bitstring (&info->rtp, self->scratch_buf, FALSE,
|
|
fec_mask_long);
|
|
}
|
|
}
|
|
|
|
ret =
|
|
rtp_ulpfec_bitstring_to_media_rtp_buffer (self->scratch_buf,
|
|
fec_mask_long, ssrc, seq);
|
|
if (ret) {
|
|
/* We are about to put recovered packet back in self->info_media to be able
|
|
* to reuse it later for recovery of other packets
|
|
**/
|
|
gint i = self->info_arr->len;
|
|
RtpUlpFecMapInfo *info;
|
|
guint8 recovered_pt;
|
|
|
|
g_array_set_size (self->info_arr, self->info_arr->len + 1);
|
|
info = RTP_FEC_MAP_INFO_NTH (self, i);
|
|
|
|
if (!rtp_ulpfec_map_info_map (gst_buffer_ref (ret), info)) {
|
|
GST_WARNING_OBJECT (self, "Invalid recovered packet");
|
|
goto recovered_packet_invalid;
|
|
}
|
|
|
|
recovered_pt = gst_rtp_buffer_get_payload_type (&info->rtp);
|
|
if (!gst_rtp_ulpfec_dec_is_recovered_pt_valid (self, media_pt,
|
|
recovered_pt)) {
|
|
GST_WARNING_OBJECT (self,
|
|
"Recovered packet has unexpected payload type (%u)", recovered_pt);
|
|
goto recovered_packet_invalid;
|
|
}
|
|
|
|
GST_DEBUG_RTP_PACKET (self, "rtp header (recovered)", &info->rtp);
|
|
self->info_media =
|
|
g_list_insert_sorted_with_data (self->info_media, GUINT_TO_POINTER (i),
|
|
_compare_fec_map_info, self);
|
|
*dst_pt = recovered_pt;
|
|
}
|
|
return ret;
|
|
|
|
recovered_packet_invalid:
|
|
g_array_set_size (self->info_arr, self->info_arr->len - 1);
|
|
gst_buffer_unref (ret);
|
|
return NULL;
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_ulpfec_dec_recover_from_storage (GstRtpUlpFecDec * self,
|
|
guint8 * dst_pt, guint16 * dst_seq)
|
|
{
|
|
RtpUlpFecMapInfo *info;
|
|
|
|
if (self->lost_packet_returned)
|
|
return NULL;
|
|
|
|
g_assert (g_list_length (self->info_media) == 1);
|
|
|
|
info = RTP_FEC_MAP_INFO_NTH (self, self->info_media->data);
|
|
*dst_seq = gst_rtp_buffer_get_seq (&info->rtp);
|
|
*dst_pt = gst_rtp_buffer_get_payload_type (&info->rtp);
|
|
self->lost_packet_returned = TRUE;
|
|
GST_DEBUG_RTP_PACKET (self, "rtp header (recovered)", &info->rtp);
|
|
return gst_buffer_ref (info->rtp.buffer);
|
|
}
|
|
|
|
/* __has_builtin only works with clang, so test compiler version for gcc */
|
|
/* Intel compiler and MSVC probably have their own things as well */
|
|
/* TODO: make sure we use builtin for clang as well */
|
|
#if defined(__GNUC__) && __GNUC__ >= 4
|
|
#define rtp_ulpfec_ctz64 __builtin_ctzll
|
|
#else
|
|
static inline gint
|
|
rtp_ulpfec_ctz64_inline (guint64 mask)
|
|
{
|
|
gint nth_bit = 0;
|
|
|
|
do {
|
|
if ((mask & 1))
|
|
return nth_bit;
|
|
mask = mask >> 1;
|
|
} while (++nth_bit < 64);
|
|
|
|
return -1; /* should not be reached, since mask must not be 0 */
|
|
}
|
|
|
|
#define rtp_ulpfec_ctz64 rtp_ulpfec_ctz64_inline
|
|
#endif
|
|
|
|
static GstBuffer *
|
|
gst_rtp_ulpfec_dec_recover (GstRtpUlpFecDec * self, guint32 ssrc, gint media_pt,
|
|
guint8 * dst_pt, guint16 * dst_seq)
|
|
{
|
|
guint64 media_mask = 0;
|
|
gint media_mask_seq_base = -1;
|
|
gsize i;
|
|
|
|
if (self->lost_packet_from_storage)
|
|
return gst_rtp_ulpfec_dec_recover_from_storage (self, dst_pt, dst_seq);
|
|
|
|
/* Looking for a FEC packet which can be used for recovery */
|
|
for (i = 0; i < self->info_fec->len; ++i) {
|
|
RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (self,
|
|
g_ptr_array_index (self->info_fec, i));
|
|
guint16 seq_base = rtp_ulpfec_buffer_get_seq_base (&info->rtp);
|
|
guint64 fec_mask = rtp_ulpfec_buffer_get_mask (&info->rtp);
|
|
guint64 missing_packets_mask;
|
|
|
|
if (media_mask_seq_base != (gint) seq_base) {
|
|
media_mask_seq_base = seq_base;
|
|
media_mask = gst_rtp_ulpfec_dec_get_media_buffers_mask (self, seq_base);
|
|
}
|
|
|
|
/* media_mask has 1s if packet exist.
|
|
* fec_mask is the mask of protected packets
|
|
* The statement below excludes existing packets from the protected. So
|
|
* we are left with 1s only for missing packets which can be recovered
|
|
* by this FEC packet. */
|
|
missing_packets_mask = fec_mask & (~media_mask);
|
|
|
|
/* Do we have any 1s? Checking if current FEC packet can be used for recovery */
|
|
if (0 != missing_packets_mask) {
|
|
guint trailing_zeros = rtp_ulpfec_ctz64 (missing_packets_mask);
|
|
|
|
/* Is it the only 1 in the mask? Checking if we lacking single packet in
|
|
* that case FEC packet can be used for recovery */
|
|
if (missing_packets_mask == (G_GUINT64_CONSTANT (1) << trailing_zeros)) {
|
|
GstBuffer *ret;
|
|
|
|
*dst_seq =
|
|
seq_base + (RTP_ULPFEC_SEQ_BASE_OFFSET_MAX (TRUE) - trailing_zeros);
|
|
ret =
|
|
gst_rtp_ulpfec_dec_recover_from_fec (self, info, ssrc, media_pt,
|
|
*dst_seq, dst_pt);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_ulpfec_dec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
|
|
{
|
|
GstRtpUlpFecDec *self = GST_RTP_ULPFEC_DEC (parent);
|
|
|
|
if (G_LIKELY (GST_FLOW_OK == self->chain_return_val)) {
|
|
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
|
buf = gst_buffer_make_writable (buf);
|
|
|
|
if (G_UNLIKELY (self->unset_discont_flag)) {
|
|
self->unset_discont_flag = FALSE;
|
|
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
|
|
}
|
|
|
|
gst_rtp_buffer_map (buf, GST_MAP_WRITE, &rtp);
|
|
gst_rtp_buffer_set_seq (&rtp, self->next_seqnum++);
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
return gst_pad_push (self->srcpad, buf);
|
|
}
|
|
|
|
gst_buffer_unref (buf);
|
|
return self->chain_return_val;
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_ulpfec_dec_handle_packet_loss (GstRtpUlpFecDec * self, guint16 seqnum,
|
|
GstClockTime timestamp, GstClockTime duration)
|
|
{
|
|
gint caps_pt = self->have_caps_pt ? self->caps_pt : -1;
|
|
gboolean ret = TRUE;
|
|
GstBufferList *buflist =
|
|
rtp_storage_get_packets_for_recovery (self->storage, self->fec_pt,
|
|
self->caps_ssrc, seqnum);
|
|
|
|
if (buflist) {
|
|
GstBuffer *recovered_buffer = NULL;
|
|
guint16 recovered_seq = 0;
|
|
guint8 recovered_pt = 0;
|
|
|
|
gst_rtp_ulpfec_dec_start (self, buflist, self->fec_pt, seqnum);
|
|
|
|
while (NULL != (recovered_buffer =
|
|
gst_rtp_ulpfec_dec_recover (self, self->caps_ssrc, caps_pt,
|
|
&recovered_pt, &recovered_seq))) {
|
|
if (seqnum == recovered_seq) {
|
|
GstBuffer *sent_buffer;
|
|
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
|
|
|
recovered_buffer = gst_buffer_make_writable (recovered_buffer);
|
|
GST_BUFFER_PTS (recovered_buffer) = timestamp;
|
|
/* GST_BUFFER_DURATION (recovered_buffer) = duration;
|
|
* JB does not set the duration, so we will not too */
|
|
|
|
if (!self->lost_packet_from_storage)
|
|
rtp_storage_put_recovered_packet (self->storage,
|
|
recovered_buffer, recovered_pt, self->caps_ssrc, recovered_seq);
|
|
|
|
GST_DEBUG_OBJECT (self,
|
|
"Pushing recovered packet ssrc=0x%08x seq=%u %" GST_PTR_FORMAT,
|
|
self->caps_ssrc, seqnum, recovered_buffer);
|
|
|
|
sent_buffer = gst_buffer_copy_deep (recovered_buffer);
|
|
|
|
if (self->lost_packet_from_storage)
|
|
gst_buffer_unref (recovered_buffer);
|
|
|
|
gst_rtp_buffer_map (sent_buffer, GST_MAP_WRITE, &rtp);
|
|
gst_rtp_buffer_set_seq (&rtp, self->next_seqnum++);
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
ret = FALSE;
|
|
self->unset_discont_flag = TRUE;
|
|
self->chain_return_val = gst_pad_push (self->srcpad, sent_buffer);
|
|
break;
|
|
}
|
|
|
|
if (!self->lost_packet_from_storage) {
|
|
rtp_storage_put_recovered_packet (self->storage,
|
|
recovered_buffer, recovered_pt, self->caps_ssrc, recovered_seq);
|
|
} else {
|
|
gst_buffer_unref (recovered_buffer);
|
|
}
|
|
}
|
|
|
|
gst_rtp_ulpfec_dec_stop (self);
|
|
gst_buffer_list_unref (buflist);
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (self, "Packet lost ssrc=0x%08x seq=%u", self->caps_ssrc,
|
|
seqnum);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_ulpfec_dec_handle_sink_event (GstPad * pad, GstObject * parent,
|
|
GstEvent * event)
|
|
{
|
|
GstRtpUlpFecDec *self = GST_RTP_ULPFEC_DEC (parent);
|
|
gboolean forward = TRUE;
|
|
|
|
GST_LOG_OBJECT (self, "Received event %" GST_PTR_FORMAT, event);
|
|
|
|
if (GST_FLOW_OK == self->chain_return_val &&
|
|
GST_EVENT_CUSTOM_DOWNSTREAM == GST_EVENT_TYPE (event) &&
|
|
gst_event_has_name (event, "GstRTPPacketLost")) {
|
|
guint seqnum;
|
|
GstClockTime timestamp, duration;
|
|
GstStructure *s;
|
|
|
|
event = gst_event_make_writable (event);
|
|
s = gst_event_writable_structure (event);
|
|
|
|
g_assert (self->have_caps_ssrc);
|
|
|
|
if (self->storage == NULL) {
|
|
GstQuery *q = gst_query_new_custom (GST_QUERY_CUSTOM,
|
|
gst_structure_new_empty ("GstRtpStorage"));
|
|
|
|
if (gst_pad_peer_query (self->sinkpad, q)) {
|
|
const GstStructure *s = gst_query_get_structure (q);
|
|
|
|
if (gst_structure_has_field_typed (s, "storage", G_TYPE_OBJECT)) {
|
|
gst_structure_get (s, "storage", G_TYPE_OBJECT, &self->storage, NULL);
|
|
}
|
|
}
|
|
gst_query_unref (q);
|
|
}
|
|
|
|
if (self->storage == NULL) {
|
|
GST_ELEMENT_WARNING (self, STREAM, FAILED, ("Internal storage not found"),
|
|
("You need to add rtpstorage element upstream from rtpulpfecdec."));
|
|
return FALSE;
|
|
}
|
|
|
|
if (!gst_structure_get (s,
|
|
"seqnum", G_TYPE_UINT, &seqnum,
|
|
"timestamp", G_TYPE_UINT64, ×tamp,
|
|
"duration", G_TYPE_UINT64, &duration, NULL))
|
|
g_assert_not_reached ();
|
|
|
|
forward =
|
|
gst_rtp_ulpfec_dec_handle_packet_loss (self, seqnum, timestamp,
|
|
duration);
|
|
|
|
if (forward) {
|
|
gst_structure_remove_field (s, "seqnum");
|
|
gst_structure_set (s, "might-have-been-fec", G_TYPE_BOOLEAN, TRUE, NULL);
|
|
++self->packets_unrecovered;
|
|
} else {
|
|
++self->packets_recovered;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (self, "Unrecovered / Recovered: %lu / %lu",
|
|
(gulong) self->packets_unrecovered, (gulong) self->packets_recovered);
|
|
} else if (GST_EVENT_CAPS == GST_EVENT_TYPE (event)) {
|
|
GstCaps *caps;
|
|
gboolean have_caps_pt = FALSE;
|
|
gboolean have_caps_ssrc = FALSE;
|
|
guint caps_ssrc = 0;
|
|
gint caps_pt = 0;
|
|
|
|
gst_event_parse_caps (event, &caps);
|
|
have_caps_ssrc =
|
|
gst_structure_get_uint (gst_caps_get_structure (caps, 0), "ssrc",
|
|
&caps_ssrc);
|
|
have_caps_pt =
|
|
gst_structure_get_int (gst_caps_get_structure (caps, 0), "payload",
|
|
&caps_pt);
|
|
|
|
if (self->have_caps_ssrc != have_caps_ssrc || self->caps_ssrc != caps_ssrc)
|
|
GST_DEBUG_OBJECT (self, "SSRC changed %u, 0x%08x -> %u, 0x%08x",
|
|
self->have_caps_ssrc, self->caps_ssrc, have_caps_ssrc, caps_ssrc);
|
|
if (self->have_caps_pt != have_caps_pt || self->caps_pt != caps_pt)
|
|
GST_DEBUG_OBJECT (self, "PT changed %u, %u -> %u, %u",
|
|
self->have_caps_pt, self->caps_pt, have_caps_pt, caps_pt);
|
|
|
|
self->have_caps_ssrc = have_caps_ssrc;
|
|
self->have_caps_pt = have_caps_pt;
|
|
self->caps_ssrc = caps_ssrc;
|
|
self->caps_pt = caps_pt;
|
|
}
|
|
|
|
if (forward)
|
|
return gst_pad_push_event (self->srcpad, event);
|
|
gst_event_unref (event);
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_init (GstRtpUlpFecDec * self)
|
|
{
|
|
self->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
|
|
self->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
|
|
GST_PAD_SET_PROXY_CAPS (self->sinkpad);
|
|
GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
|
|
gst_pad_set_chain_function (self->sinkpad,
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_dec_chain));
|
|
gst_pad_set_event_function (self->sinkpad,
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_dec_handle_sink_event));
|
|
|
|
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
|
|
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
|
|
|
|
self->fec_pt = DEFAULT_FEC_PT;
|
|
|
|
self->next_seqnum = g_random_int_range (0, G_MAXINT16);
|
|
|
|
self->chain_return_val = GST_FLOW_OK;
|
|
self->have_caps_ssrc = FALSE;
|
|
self->caps_ssrc = 0;
|
|
self->info_fec = g_ptr_array_new ();
|
|
self->info_arr = g_array_new (FALSE, TRUE, sizeof (RtpUlpFecMapInfo));
|
|
g_array_set_clear_func (self->info_arr,
|
|
(GDestroyNotify) rtp_ulpfec_map_info_unmap);
|
|
self->scratch_buf = g_array_new (FALSE, TRUE, sizeof (guint8));
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_dispose (GObject * obj)
|
|
{
|
|
GstRtpUlpFecDec *self = GST_RTP_ULPFEC_DEC (obj);
|
|
|
|
GST_INFO_OBJECT (self,
|
|
" ssrc=0x%08x pt=%u"
|
|
" packets_recovered=%" G_GSIZE_FORMAT
|
|
" packets_unrecovered=%" G_GSIZE_FORMAT,
|
|
self->caps_ssrc, self->caps_pt,
|
|
self->packets_recovered, self->packets_unrecovered);
|
|
|
|
if (self->storage)
|
|
g_object_unref (self->storage);
|
|
|
|
g_assert (NULL == self->info_media);
|
|
g_assert (0 == self->info_fec->len);
|
|
g_assert (0 == self->info_arr->len);
|
|
|
|
if (self->fec_packets_received) {
|
|
GST_INFO_OBJECT (self,
|
|
" fec_packets_received=%" G_GSIZE_FORMAT
|
|
" fec_packets_rejected=%" G_GSIZE_FORMAT
|
|
" packets_rejected=%" G_GSIZE_FORMAT,
|
|
self->fec_packets_received,
|
|
self->fec_packets_rejected, self->packets_rejected);
|
|
}
|
|
|
|
g_ptr_array_free (self->info_fec, TRUE);
|
|
g_array_free (self->info_arr, TRUE);
|
|
g_array_free (self->scratch_buf, TRUE);
|
|
|
|
G_OBJECT_CLASS (gst_rtp_ulpfec_dec_parent_class)->dispose (obj);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpUlpFecDec *self = GST_RTP_ULPFEC_DEC (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_PT:
|
|
self->fec_pt = g_value_get_uint (value);
|
|
break;
|
|
case PROP_STORAGE:
|
|
if (self->storage)
|
|
g_object_unref (self->storage);
|
|
self->storage = g_value_get_object (value);
|
|
if (self->storage)
|
|
g_object_ref (self->storage);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpUlpFecDec *self = GST_RTP_ULPFEC_DEC (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_PT:
|
|
g_value_set_uint (value, self->fec_pt);
|
|
break;
|
|
case PROP_STORAGE:
|
|
g_value_set_object (value, self->storage);
|
|
break;
|
|
case PROP_RECOVERED:
|
|
g_value_set_uint (value, (guint) self->packets_recovered);
|
|
break;
|
|
case PROP_UNRECOVERED:
|
|
g_value_set_uint (value, (guint) self->packets_unrecovered);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_dec_class_init (GstRtpUlpFecDecClass * klass)
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
|
|
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
|
|
|
|
GST_DEBUG_CATEGORY_INIT (gst_rtp_ulpfec_dec_debug,
|
|
"rtpulpfecdec", 0, "RTP FEC Decoder");
|
|
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&srctemplate));
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&sinktemplate));
|
|
|
|
gst_element_class_set_static_metadata (element_class,
|
|
"RTP FEC Decoder",
|
|
"Codec/Depayloader/Network/RTP",
|
|
"Decodes RTP FEC (RFC5109)", "Mikhail Fludkov <misha@pexip.com>");
|
|
|
|
gobject_class->set_property =
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_dec_set_property);
|
|
gobject_class->get_property =
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_dec_get_property);
|
|
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_dec_dispose);
|
|
|
|
klass_properties[PROP_PT] = g_param_spec_uint ("pt", "pt",
|
|
"FEC packets payload type", 0, 127,
|
|
DEFAULT_FEC_PT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
|
|
klass_properties[PROP_STORAGE] =
|
|
g_param_spec_object ("storage", "RTP storage", "RTP storage",
|
|
G_TYPE_OBJECT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
|
|
klass_properties[PROP_RECOVERED] =
|
|
g_param_spec_uint ("recovered", "recovered",
|
|
"The number of recovered packets", 0, G_MAXUINT, 0,
|
|
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
|
|
klass_properties[PROP_UNRECOVERED] =
|
|
g_param_spec_uint ("unrecovered", "unrecovered",
|
|
"The number of unrecovered packets", 0, G_MAXUINT, 0,
|
|
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
|
|
|
|
g_object_class_install_properties (gobject_class, N_PROPERTIES,
|
|
klass_properties);
|
|
|
|
g_assert (rtp_ulpfec_ctz64 (G_GUINT64_CONSTANT (0x1)) == 0);
|
|
g_assert (rtp_ulpfec_ctz64 (G_GUINT64_CONSTANT (0x8000000000000000)) == 63);
|
|
}
|