mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 10:41:04 +00:00
90f5ae8f45
ULP FEC, as defined in RFC 5109, has the protected and protection packets sharing the same ssrc, and a different payload type, and implies rewriting the seqnums of the protected stream when encoding the protection packets. This has the unfortunate drawback of not being able to tell whether a lost packet was a protection packet. rtpbasedepayload relies on gaps in the seqnums to set the DISCONT flag on buffers it outputs. Before that commit, this created two problems: * The protection packets don't make it as far as the depayloader, which means it will mark buffers as DISCONT every time the previous packets were protected * While we could work around the previous issue by looking at the protection packets ignored and dropped in rtpptdemux, we would still mark buffers as DISCONT when a FEC packet was lost, as we cannot know that it was indeed a FEC packet, even though this should have no impact on the decoding of the stream With this commit, we consider that when using ULPFEC, gaps in the seqnums are not a reliable indicator of whether buffers should be marked as DISCONT or not, and thus rewrite the seqnums on the decoding side as well to form a perfect sequence, this obviously doesn't prevent the jitterbuffer from doing its job as the ulpfec decoder is downstream from it. https://bugzilla.gnome.org/show_bug.cgi?id=794909
84 lines
2.4 KiB
C
84 lines
2.4 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>
|
|
*/
|
|
|
|
#ifndef __GST_RTP_ULPFEC_DEC_H__
|
|
#define __GST_RTP_ULPFEC_DEC_H__
|
|
|
|
#include <gst/gst.h>
|
|
|
|
#include "rtpstorage.h"
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_RTP_ULPFEC_DEC \
|
|
(gst_rtp_ulpfec_dec_get_type())
|
|
#define GST_RTP_ULPFEC_DEC(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_ULPFEC_DEC,GstRtpUlpFecDec))
|
|
#define GST_RTP_ULPFEC_DEC_CLASS(klass) \
|
|
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_ULPFEC_DEC,GstRtpUlpFecDecClass))
|
|
#define GST_IS_RTP_ULPFEC_DEC(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_ULPFEC_DEC))
|
|
#define GST_IS_RTP_ULPFEC_DEC_CLASS(klass) \
|
|
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_ULPFEC_DEC))
|
|
|
|
typedef struct _GstRtpUlpFecDec GstRtpUlpFecDec;
|
|
typedef struct _GstRtpUlpFecDecClass GstRtpUlpFecDecClass;
|
|
|
|
struct _GstRtpUlpFecDecClass {
|
|
GstElementClass parent_class;
|
|
};
|
|
|
|
struct _GstRtpUlpFecDec {
|
|
GstElement parent;
|
|
GstPad *srcpad;
|
|
GstPad *sinkpad;
|
|
|
|
/* properties */
|
|
guint8 fec_pt;
|
|
RtpStorage *storage;
|
|
gsize packets_recovered;
|
|
gsize packets_unrecovered;
|
|
|
|
/* internal stuff */
|
|
GstFlowReturn chain_return_val;
|
|
gboolean unset_discont_flag;
|
|
gboolean have_caps_ssrc;
|
|
gboolean have_caps_pt;
|
|
guint32 caps_ssrc;
|
|
guint8 caps_pt;
|
|
GList *info_media;
|
|
GPtrArray *info_fec;
|
|
GArray *info_arr;
|
|
GArray *scratch_buf;
|
|
gboolean lost_packet_from_storage;
|
|
gboolean lost_packet_returned;
|
|
guint16 next_seqnum;
|
|
|
|
/* stats */
|
|
gsize fec_packets_received;
|
|
gsize fec_packets_rejected;
|
|
gsize packets_rejected;
|
|
};
|
|
|
|
GType gst_rtp_ulpfec_dec_get_type (void);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_RTP_ULPFEC_DEC_H__ */
|