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ristrtxsend: Store sent packets with extended seqnum

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1153>
This commit is contained in:
Olivier Crête 2019-07-26 16:50:21 -04:00 committed by Olivier Crête
parent efd78bb8d8
commit 58e31e116b
1 changed files with 34 additions and 7 deletions
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41
gst/rist/gstristrtxsend.c
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@ -125,7 +125,7 @@ G_DEFINE_TYPE_WITH_CODE (GstRistRtxSend, gst_rist_rtx_send, GST_TYPE_ELEMENT,
typedef struct
{
guint16 seqnum;
guint32 extseqnum;
guint32 timestamp;
GstBuffer *buffer;
} BufferQueueItem;
@ -145,6 +145,7 @@ typedef struct
/* history of rtp packets */
GSequence *queue;
guint32 max_extseqnum;
} SSRCRtxData;
static SSRCRtxData *
@ -155,6 +156,7 @@ ssrc_rtx_data_new (guint32 rtx_ssrc)
data->rtx_ssrc = rtx_ssrc;
data->next_seqnum = data->seqnum_base = g_random_int_range (0, G_MAXUINT16);
data->queue = g_sequence_new ((GDestroyNotify) buffer_queue_item_free);
data->max_extseqnum = -1;
return data;
}
@ -368,7 +370,7 @@ buffer_queue_items_cmp (BufferQueueItem * a, BufferQueueItem * b,
/* gst_rtp_buffer_compare_seqnum returns the opposite of what we want,
* it returns negative when seqnum1 > seqnum2 and we want negative
* when b > a, i.e. a is smaller, so it comes first in the sequence */
return gst_rtp_buffer_compare_seqnum (b->seqnum, a->seqnum);
return a->extseqnum - b->extseqnum;
}
static gboolean
@ -404,18 +406,25 @@ gst_rist_rtx_send_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
SSRCRtxData *data;
GSequenceIter *iter;
BufferQueueItem search_item;
guint32 extseqnum;
guint32 max_extseqnum;
/* update statistics */
++rtx->num_rtx_requests;
data = gst_rist_rtx_send_get_ssrc_data (rtx, ssrc);
search_item.seqnum = seqnum;
max_extseqnum = data->max_extseqnum;
extseqnum = gst_rist_rtp_ext_seq (&max_extseqnum, seqnum);
search_item.extseqnum = extseqnum;
iter = g_sequence_lookup (data->queue, &search_item,
(GCompareDataFunc) buffer_queue_items_cmp, NULL);
if (iter) {
BufferQueueItem *item = g_sequence_get (iter);
GST_LOG_OBJECT (rtx, "found %u", item->seqnum);
GST_LOG_OBJECT (rtx, "found %u (%u:%u)", item->extseqnum,
item->extseqnum >> 16, item->extseqnum & 0xFFFF);
rtx_buf = gst_rtp_rist_buffer_new (rtx, item->buffer, ssrc);
}
#ifndef GST_DISABLE_DEBUG
@ -426,10 +435,10 @@ gst_rist_rtx_send_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
if (!g_sequence_iter_is_end (iter))
item = g_sequence_get (iter);
if (item && seqnum < item->seqnum) {
if (item && extseqnum < item->extseqnum) {
GST_DEBUG_OBJECT (rtx, "requested seqnum %u has already been "
"removed from the rtx queue; the first available is %u",
seqnum, item->seqnum);
seqnum, item->extseqnum);
} else {
GST_WARNING_OBJECT (rtx, "requested seqnum %u has not been "
"transmitted yet in the original stream; either the remote end "
@ -566,12 +575,25 @@ process_buffer (GstRistRtxSend * rtx, GstBuffer * buffer)
SSRCRtxData *data;
guint16 seqnum;
guint32 ssrc, rtptime;
guint16 bits;
gpointer extdata;
guint extlen;
gboolean has_seqnum_ext = FALSE;
guint32 extseqnum;
/* read the information we want from the buffer */
gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
seqnum = gst_rtp_buffer_get_seq (&rtp);
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
rtptime = gst_rtp_buffer_get_timestamp (&rtp);
if (gst_rtp_buffer_get_extension_data (&rtp, &bits, &extdata, &extlen)) {
/* Has header extension */
has_seqnum_ext = (bits >> 14) & 1; /* E */
if (extlen != 1)
has_seqnum_ext = FALSE;
if (has_seqnum_ext)
extseqnum = GST_READ_UINT16_BE (extdata) << 16 | seqnum;
}
gst_rtp_buffer_unmap (&rtp);
GST_TRACE_OBJECT (rtx, "Processing buffer seqnum: %u, ssrc: %X", seqnum,
@ -579,9 +601,14 @@ process_buffer (GstRistRtxSend * rtx, GstBuffer * buffer)
data = gst_rist_rtx_send_get_ssrc_data (rtx, ssrc);
if (has_seqnum_ext)
data->max_extseqnum = MAX (data->max_extseqnum, extseqnum);
else
extseqnum = gst_rist_rtp_ext_seq (&data->max_extseqnum, seqnum);
/* add current rtp buffer to queue history */
item = g_slice_new0 (BufferQueueItem);
item->seqnum = seqnum;
item->extseqnum = extseqnum;
item->timestamp = rtptime;
item->buffer = gst_buffer_ref (buffer);
g_sequence_append (data->queue, item);