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session: add NACK feedback in RTCP

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This commit is contained in:
Wim Taymans 2013-08-05 23:23:57 +02:00
parent 4379ed1dee
commit 48174164eb
1 changed files with 45 additions and 0 deletions
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45
gst/rtpmanager/rtpsession.c
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@ -2704,6 +2704,7 @@ typedef struct
guint num_to_report;
gboolean have_fir;
gboolean have_pli;
gboolean have_nack;
GstBuffer *rtcp;
GstClockTime current_time;
guint64 ntpnstime;
@ -2912,6 +2913,43 @@ session_pli (const gchar * key, RTPSource * source, ReportData * data)
data->may_suppress = FALSE;
}
/* construct NACK */
static void
session_nack (const gchar * key, RTPSource * source, ReportData * data)
{
GstRTCPBuffer *rtcp = &data->rtcpbuf;
GstRTCPPacket *packet = &data->packet;
guint32 *nacks;
guint n_nacks, i;
guint8 *fci_data;
if (!source->send_nack)
return;
if (!gst_rtcp_buffer_add_packet (rtcp, GST_RTCP_TYPE_RTPFB, packet))
/* exit because the packet is full, will put next request in a
* further packet */
return;
gst_rtcp_packet_fb_set_type (packet, GST_RTCP_RTPFB_TYPE_NACK);
gst_rtcp_packet_fb_set_sender_ssrc (packet, data->source->ssrc);
gst_rtcp_packet_fb_set_media_ssrc (packet, source->ssrc);
nacks = rtp_source_get_nacks (source, &n_nacks);
GST_DEBUG ("%u NACKs", n_nacks);
if (!gst_rtcp_packet_fb_set_fci_length (packet, n_nacks))
return;
fci_data = gst_rtcp_packet_fb_get_fci (packet);
for (i = 0; i < n_nacks; i++) {
GST_WRITE_UINT32_BE (fci_data, nacks[i]);
fci_data += 4;
}
rtp_source_clear_nacks (source);
data->may_suppress = FALSE;
}
/* perform cleanup of sources that timed out */
static void
session_cleanup (const gchar * key, RTPSource * source, ReportData * data)
@ -3227,6 +3265,8 @@ remove_closing_sources (const gchar * key, RTPSource * source,
data->have_fir = TRUE;
if (source->send_pli)
data->have_pli = TRUE;
if (source->send_nack)
data->have_nack = TRUE;
return FALSE;
}
@ -3267,6 +3307,10 @@ generate_rtcp (const gchar * key, RTPSource * source, ReportData * data)
g_hash_table_foreach (sess->ssrcs[sess->mask_idx],
(GHFunc) session_pli, data);
if (data->have_nack)
g_hash_table_foreach (sess->ssrcs[sess->mask_idx],
(GHFunc) session_nack, data);
gst_rtcp_buffer_unmap (&data->rtcpbuf);
output = g_slice_new (ReportOutput);
@ -3525,6 +3569,7 @@ rtp_session_request_nack (RTPSession * sess, guint32 ssrc, guint16 seqnum,
return FALSE;
GST_DEBUG ("request NACK for %08x, #%u", ssrc, seqnum);
rtp_source_register_nack (source, seqnum);
rtp_session_send_rtcp (sess, max_delay);