mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-24 17:20:36 +00:00
rtpfunnel: various cleanups
* Organize GstRtpFunnelPad and GstRtpFunnel separately * Use G_GNUC_UNUSED instead of (void) casts * Don't call an event "caps" * Use semicolons after GST_END_TEST (helps gst-indent)
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commit
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2 changed files with 412 additions and 28 deletions
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@ -20,15 +20,63 @@
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-rtpfunnel
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* @title: rtpfunnel
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* @see_also: rtpbasepaylaoder, rtpsession
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*
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* RTP funnel is basically like a normal funnel with a few added
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* functionalities to support bundling.
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*
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* Bundle is the concept of sending multiple streams in a single RTP session.
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* These can be both audio and video streams, and several of both.
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* One of the advantages with bundling is that you can get away with fewer
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* ports for sending and receiving media. Also the RTCP traffic gets more
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* compact if you can report on multiple streams in a single sender/receiver
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* report.
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*
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* One of the reasons for a specialized RTP funnel is that some messages
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* coming upstream want to find their way back to the right stream,
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* and a normal funnel can't know which of its sinkpads it should send
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* these messages to. The RTP funnel achieves this by keeping track of the
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* SSRC of each stream on its sinkpad, and then uses the fact that upstream
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* events are tagged inside rtpbin with the appropriate SSRC, so that upon
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* receiving such an event, the RTP funnel can do a simple lookup for the
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* right pad to forward the event to.
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*
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* A good example here is the KeyUnit event. If several video encoders are
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* being bundled together using the RTP funnel, and one of the decoders on
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* the receiving side asks for a KeyUnit, typically a RTCP PLI message will
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* be sent from the receiver to the sender, and this will be transformed into
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* a GstForceKeyUnit event inside GstRTPSession, and sent upstream. The
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* RTP funnel can than make sure that this event hits the right encoder based
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* on the SSRC embedded in the event.
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*
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* Another feature of the RTP funnel is that it will mux together TWCC
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* (Transport-Wide Congestion Control) sequence-numbers. The point being that
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* it should increment "transport-wide", meaning potentially several
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* bundled streams. Note that not *all* streams being bundled needs to be
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* affected by this. As an example Google WebRTC will use bundle with audio
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* and video, but will only use TWCC sequence-numbers for the video-stream(s).
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/rtp/gstrtpbuffer.h>
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#include "gstrtpfunnel.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rtp_funnel_debug);
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#define GST_CAT_DEFAULT gst_rtp_funnel_debug
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#define TWCC_EXTMAP_STR "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01"
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/**************** GstRTPFunnelPad ****************/
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struct _GstRtpFunnelPadClass
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{
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GstPadClass class;
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@ -38,8 +86,23 @@ struct _GstRtpFunnelPad
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{
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GstPad pad;
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guint32 ssrc;
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gboolean has_twcc;
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};
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G_DEFINE_TYPE (GstRtpFunnelPad, gst_rtp_funnel_pad, GST_TYPE_PAD);
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static void
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gst_rtp_funnel_pad_class_init (G_GNUC_UNUSED GstRtpFunnelPadClass * klass)
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{
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}
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static void
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gst_rtp_funnel_pad_init (G_GNUC_UNUSED GstRtpFunnelPad * pad)
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{
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}
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/**************** GstRTPFunnel ****************/
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enum
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{
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PROP_0,
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#define DEFAULT_COMMON_TS_OFFSET -1
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G_DEFINE_TYPE (GstRtpFunnelPad, gst_rtp_funnel_pad, GST_TYPE_PAD);
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static void
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gst_rtp_funnel_pad_class_init (GstRtpFunnelPadClass * klass)
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{
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(void) klass;
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}
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static void
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gst_rtp_funnel_pad_init (GstRtpFunnelPad * pad)
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{
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(void) pad;
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}
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struct _GstRtpFunnelClass
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{
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GstElementClass class;
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/* The last pad data was chained on */
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GstPad *current_pad;
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guint8 twcc_ext_id; /* the negotiated twcc extmap id */
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guint16 twcc_seqnum; /* our internal twcc seqnum */
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guint twcc_pads; /* numer of sinkpads with negotiated twcc */
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/* properties */
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gint common_ts_offset;
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};
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gst_rtp_funnel_send_sticky (GstRtpFunnel * funnel, GstPad * pad)
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{
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GstEvent *stream_start;
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GstEvent *caps;
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GstEvent *caps_ev;
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if (!funnel->send_sticky_events)
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goto done;
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@ -113,8 +166,8 @@ gst_rtp_funnel_send_sticky (GstRtpFunnel * funnel, GstPad * pad)
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goto done;
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}
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caps = gst_event_new_caps (funnel->srccaps);
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if (caps && !gst_pad_push_event (funnel->srcpad, caps)) {
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caps_ev = gst_event_new_caps (funnel->srccaps);
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if (caps_ev && !gst_pad_push_event (funnel->srcpad, caps_ev)) {
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GST_ERROR_OBJECT (funnel, "Could not push caps");
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goto done;
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}
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return;
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}
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static void
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gst_rtp_funnel_set_twcc_seqnum (GstRtpFunnel * funnel,
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GstPad * pad, GstBuffer ** buf)
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{
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GstRtpFunnelPad *fpad = GST_RTP_FUNNEL_PAD_CAST (pad);
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GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
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if (!funnel->twcc_ext_id || !fpad->has_twcc)
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return;
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*buf = gst_buffer_make_writable (*buf);
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if (gst_rtp_buffer_map (*buf, GST_MAP_READWRITE, &rtp)) {
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gpointer data;
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/* if there already is a twcc-seqnum inside the packet */
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if (gst_rtp_buffer_get_extension_onebyte_header (&rtp, funnel->twcc_ext_id,
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0, &data, NULL)) {
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/* with only one pad, we read the twcc-seqnum instead of writing it */
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if (funnel->twcc_pads == 1) {
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funnel->twcc_seqnum = GST_READ_UINT16_BE (data);
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} else {
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GST_WRITE_UINT16_BE (data, funnel->twcc_seqnum);
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}
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} else {
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guint16 seq_be;
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GST_WRITE_UINT16_BE (&seq_be, funnel->twcc_seqnum);
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gst_rtp_buffer_add_extension_onebyte_header (&rtp, funnel->twcc_ext_id,
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&seq_be, 2);
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}
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}
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gst_rtp_buffer_unmap (&rtp);
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funnel->twcc_seqnum++;
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}
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static GstFlowReturn
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gst_rtp_funnel_sink_chain_object (GstPad * pad, GstRtpFunnel * funnel,
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gboolean is_list, GstMiniObject * obj)
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gst_rtp_funnel_send_sticky (funnel, pad);
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gst_rtp_funnel_forward_segment (funnel, pad);
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if (is_list)
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if (is_list) {
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res = gst_pad_push_list (funnel->srcpad, GST_BUFFER_LIST_CAST (obj));
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else
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res = gst_pad_push (funnel->srcpad, GST_BUFFER_CAST (obj));
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} else {
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GstBuffer *buf = GST_BUFFER_CAST (obj);
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gst_rtp_funnel_set_twcc_seqnum (funnel, pad, &buf);
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res = gst_pad_push (funnel->srcpad, buf);
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}
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GST_PAD_STREAM_UNLOCK (funnel->srcpad);
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return res;
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GST_MINI_OBJECT_CAST (buffer));
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}
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static void
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gst_rtp_funnel_set_twcc_ext_id (GstRtpFunnel * funnel, guint8 twcc_ext_id)
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{
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gchar *name;
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if (funnel->twcc_ext_id == twcc_ext_id)
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return;
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name = g_strdup_printf ("extmap-%u", twcc_ext_id);
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gst_caps_set_simple (funnel->srccaps, name, G_TYPE_STRING, TWCC_EXTMAP_STR,
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NULL);
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g_free (name);
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/* make sure we update the sticky with the new caps */
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funnel->send_sticky_events = TRUE;
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GST_INFO_OBJECT (funnel, "Setting twcc-ext-id to %u", twcc_ext_id);
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funnel->twcc_ext_id = twcc_ext_id;
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}
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static guint8
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_get_extmap_id_for_attribute (const GstStructure * s, const gchar * ext_name)
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{
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guint i;
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guint8 extmap_id = 0;
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guint n_fields = gst_structure_n_fields (s);
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for (i = 0; i < n_fields; i++) {
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const gchar *field_name = gst_structure_nth_field_name (s, i);
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if (g_str_has_prefix (field_name, "extmap-")) {
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const gchar *str = gst_structure_get_string (s, field_name);
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if (str && g_strcmp0 (str, ext_name) == 0) {
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gint64 id = g_ascii_strtoll (field_name + 7, NULL, 10);
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if (id > 0 && id < 15) {
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extmap_id = id;
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break;
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}
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}
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}
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}
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return extmap_id;
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}
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static gboolean
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gst_rtp_funnel_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstRtpFunnel *funnel = GST_RTP_FUNNEL_CAST (parent);
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GstRtpFunnelPad *fpad = GST_RTP_FUNNEL_PAD_CAST (pad);
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gboolean forward = TRUE;
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gboolean ret = TRUE;
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GstCaps *caps;
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GstStructure *s;
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guint ssrc;
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guint8 ext_id;
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gst_event_parse_caps (event, &caps);
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if (!gst_caps_can_intersect (funnel->srccaps, caps)) {
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s = gst_caps_get_structure (caps, 0);
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if (gst_structure_get_uint (s, "ssrc", &ssrc)) {
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GstRtpFunnelPad *fpad = GST_RTP_FUNNEL_PAD_CAST (pad);
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fpad->ssrc = ssrc;
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GST_DEBUG_OBJECT (pad, "Got ssrc: %u", ssrc);
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GST_OBJECT_LOCK (funnel);
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g_hash_table_insert (funnel->ssrc_to_pad, GUINT_TO_POINTER (ssrc), pad);
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GST_OBJECT_UNLOCK (funnel);
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}
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ext_id = _get_extmap_id_for_attribute (s, TWCC_EXTMAP_STR);
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if (ext_id > 0) {
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fpad->has_twcc = TRUE;
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funnel->twcc_pads++;
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gst_rtp_funnel_set_twcc_ext_id (funnel, ext_id);
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}
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forward = FALSE;
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break;
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gst_rtp_funnel_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
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{
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GstRtpFunnel *funnel = GST_RTP_FUNNEL_CAST (parent);
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gboolean res = FALSE;
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(void) funnel;
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gboolean res = TRUE;
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_CAPS:
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GST_DEBUG_OBJECT (pad, "Answering caps-query with caps: %"
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GST_PTR_FORMAT, new_caps);
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gst_caps_unref (new_caps);
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res = TRUE;
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break;
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}
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case GST_QUERY_ACCEPT_CAPS:
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{
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GstCaps *caps;
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gboolean result;
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gst_query_parse_accept_caps (query, &caps);
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result = gst_caps_is_subset (caps, funnel->srccaps);
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if (!result) {
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GST_ERROR_OBJECT (pad,
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"caps: %" GST_PTR_FORMAT " were not compatible with: %"
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GST_PTR_FORMAT, caps, funnel->srccaps);
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}
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gst_query_set_accept_caps_result (query, result);
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break;
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}
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default:
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@ -22,6 +22,7 @@
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*/
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#include <gst/check/gstcheck.h>
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#include <gst/check/gstharness.h>
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#include <gst/rtp/gstrtpbuffer.h>
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GST_START_TEST (rtpfunnel_ssrc_demuxing)
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{
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gst_harness_teardown (h1);
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}
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GST_END_TEST
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GST_END_TEST;
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GST_START_TEST (rtpfunnel_ssrc_downstream_not_leaking_through)
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{
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GstHarness *h = gst_harness_new_with_padnames ("rtpfunnel",
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gst_harness_teardown (h);
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}
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GST_END_TEST
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GST_END_TEST;
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GST_START_TEST (rtpfunnel_common_ts_offset)
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{
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GstHarness *h = gst_harness_new_with_padnames ("rtpfunnel",
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gst_harness_teardown (h);
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}
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GST_END_TEST
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GST_END_TEST;
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GST_START_TEST (rtpfunnel_stress)
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{
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GstHarness *h = gst_harness_new_with_padnames ("rtpfunnel",
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GST_END_TEST;
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#define TWCC_EXTMAP_STR "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01"
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GST_START_TEST (rtpfunnel_twcc_caps)
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{
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GstHarness *h, *h0, *h1;
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GstCaps *caps, *expected_caps;
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h = gst_harness_new_with_padnames ("rtpfunnel", NULL, "src");
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/* request a sinkpad, set caps with twcc extmap */
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h0 = gst_harness_new_with_element (h->element, "sink_0", NULL);
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gst_harness_set_src_caps_str (h0, "application/x-rtp, "
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"ssrc=(uint)123, extmap-5=" TWCC_EXTMAP_STR "");
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/* request a second sinkpad, and verify the extmap is
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present in the caps when doing a caps-query downstream */
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h1 = gst_harness_new_with_element (h->element, "sink_1", NULL);
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caps = gst_pad_query_caps (GST_PAD_PEER (h1->srcpad), NULL);
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expected_caps = gst_caps_from_string ("application/x-rtp, "
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"extmap-5=" TWCC_EXTMAP_STR "");
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fail_unless (gst_caps_is_equal (expected_caps, caps));
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gst_caps_unref (caps);
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gst_caps_unref (expected_caps);
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/* now try and set a different extmap (4) on the other sinkpad,
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and verify this does not work */
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gst_harness_set_src_caps_str (h1, "application/x-rtp, "
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"ssrc=(uint)456, extmap-4=" TWCC_EXTMAP_STR "");
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caps = gst_pad_get_current_caps (GST_PAD_PEER (h1->srcpad));
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fail_unless (caps == NULL);
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/* ...but setting the right extmap (5) will work just fine */
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expected_caps = gst_caps_from_string ("application/x-rtp, "
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"ssrc=(uint)456, extmap-5=" TWCC_EXTMAP_STR "");
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gst_harness_set_src_caps (h1, gst_caps_ref (expected_caps));
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caps = gst_pad_get_current_caps (GST_PAD_PEER (h1->srcpad));
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fail_unless (gst_caps_is_equal (expected_caps, caps));
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gst_caps_unref (caps);
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gst_caps_unref (expected_caps);
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gst_harness_teardown (h);
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gst_harness_teardown (h0);
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gst_harness_teardown (h1);
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}
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GST_END_TEST;
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static GstBuffer *
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generate_test_buffer (guint seqnum, guint ssrc, guint8 twcc_ext_id)
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{
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GstBuffer *buf;
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GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
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buf = gst_rtp_buffer_new_allocate (0, 0, 0);
|
||||
GST_BUFFER_PTS (buf) = seqnum * 20 * GST_MSECOND;
|
||||
GST_BUFFER_DTS (buf) = GST_BUFFER_PTS (buf);
|
||||
|
||||
gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp);
|
||||
gst_rtp_buffer_set_payload_type (&rtp, 100);
|
||||
gst_rtp_buffer_set_seq (&rtp, seqnum);
|
||||
gst_rtp_buffer_set_timestamp (&rtp, seqnum * 160);
|
||||
gst_rtp_buffer_set_ssrc (&rtp, ssrc);
|
||||
|
||||
if (twcc_ext_id > 0) {
|
||||
guint16 data;
|
||||
GST_WRITE_UINT16_BE (&data, seqnum);
|
||||
gst_rtp_buffer_add_extension_onebyte_header (&rtp, twcc_ext_id,
|
||||
&data, sizeof (guint16));
|
||||
}
|
||||
|
||||
gst_rtp_buffer_unmap (&rtp);
|
||||
|
||||
return buf;
|
||||
}
|
||||
|
||||
static gint32
|
||||
get_twcc_seqnum (GstBuffer * buf, guint8 ext_id)
|
||||
{
|
||||
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
||||
gint32 val = -1;
|
||||
gpointer data;
|
||||
|
||||
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
|
||||
if (gst_rtp_buffer_get_extension_onebyte_header (&rtp, ext_id,
|
||||
0, &data, NULL)) {
|
||||
val = GST_READ_UINT16_BE (data);
|
||||
}
|
||||
gst_rtp_buffer_unmap (&rtp);
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static guint32
|
||||
get_ssrc (GstBuffer * buf)
|
||||
{
|
||||
guint32 ssrc;
|
||||
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
||||
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
|
||||
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
|
||||
gst_rtp_buffer_unmap (&rtp);
|
||||
return ssrc;
|
||||
}
|
||||
|
||||
GST_START_TEST (rtpfunnel_twcc_passthrough)
|
||||
{
|
||||
GstHarness *h, *h0;
|
||||
GstBuffer *buf;
|
||||
guint16 offset = 65530;
|
||||
guint packets = 40;
|
||||
guint i;
|
||||
|
||||
h = gst_harness_new_with_padnames ("rtpfunnel", NULL, "src");
|
||||
h0 = gst_harness_new_with_element (h->element, "sink_0", NULL);
|
||||
gst_harness_set_src_caps_str (h0, "application/x-rtp, "
|
||||
"ssrc=(uint)123, extmap-5=" TWCC_EXTMAP_STR "");
|
||||
|
||||
/* push some packets with twcc seqnum */
|
||||
for (i = 0; i < packets; i++) {
|
||||
guint16 seqnum = i + offset;
|
||||
fail_unless_equals_int (GST_FLOW_OK,
|
||||
gst_harness_push (h0, generate_test_buffer (seqnum, 123, 5)));
|
||||
}
|
||||
|
||||
/* and verify the seqnums stays unchanged through the funnel */
|
||||
for (i = 0; i < packets; i++) {
|
||||
guint16 seqnum = i + offset;
|
||||
buf = gst_harness_pull (h);
|
||||
fail_unless_equals_int (seqnum, get_twcc_seqnum (buf, 5));
|
||||
gst_buffer_unref (buf);
|
||||
}
|
||||
|
||||
gst_harness_teardown (h);
|
||||
gst_harness_teardown (h0);
|
||||
}
|
||||
|
||||
GST_END_TEST;
|
||||
|
||||
GST_START_TEST (rtpfunnel_twcc_mux)
|
||||
{
|
||||
GstHarness *h, *h0, *h1;
|
||||
GstBuffer *buf;
|
||||
|
||||
h = gst_harness_new_with_padnames ("rtpfunnel", NULL, "src");
|
||||
h0 = gst_harness_new_with_element (h->element, "sink_0", NULL);
|
||||
h1 = gst_harness_new_with_element (h->element, "sink_1", NULL);
|
||||
gst_harness_set_src_caps_str (h0, "application/x-rtp, "
|
||||
"ssrc=(uint)123, extmap-5=" TWCC_EXTMAP_STR "");
|
||||
gst_harness_set_src_caps_str (h1, "application/x-rtp, "
|
||||
"ssrc=(uint)456, extmap-5=" TWCC_EXTMAP_STR "");
|
||||
|
||||
/* push buffers on both pads with different twcc-seqnums on them (500 and 60000) */
|
||||
fail_unless_equals_int (GST_FLOW_OK,
|
||||
gst_harness_push (h0, generate_test_buffer (500, 123, 5)));
|
||||
fail_unless_equals_int (GST_FLOW_OK,
|
||||
gst_harness_push (h1, generate_test_buffer (60000, 321, 5)));
|
||||
|
||||
/* verify they are muxed continuously (0 -> 1) */
|
||||
buf = gst_harness_pull (h);
|
||||
fail_unless_equals_int (123, get_ssrc (buf));
|
||||
fail_unless_equals_int (0, get_twcc_seqnum (buf, 5));
|
||||
gst_buffer_unref (buf);
|
||||
|
||||
buf = gst_harness_pull (h);
|
||||
fail_unless_equals_int (321, get_ssrc (buf));
|
||||
fail_unless_equals_int (1, get_twcc_seqnum (buf, 5));
|
||||
gst_buffer_unref (buf);
|
||||
|
||||
gst_harness_teardown (h);
|
||||
gst_harness_teardown (h0);
|
||||
gst_harness_teardown (h1);
|
||||
}
|
||||
|
||||
GST_END_TEST;
|
||||
|
||||
|
||||
GST_START_TEST (rtpfunnel_twcc_passthrough_then_mux)
|
||||
{
|
||||
GstHarness *h, *h0, *h1;
|
||||
GstBuffer *buf;
|
||||
guint offset0 = 500;
|
||||
guint offset1 = 45678;
|
||||
guint i;
|
||||
|
||||
h = gst_harness_new_with_padnames ("rtpfunnel", NULL, "src");
|
||||
h0 = gst_harness_new_with_element (h->element, "sink_0", NULL);
|
||||
gst_harness_set_src_caps_str (h0, "application/x-rtp, "
|
||||
"ssrc=(uint)123, extmap-5=" TWCC_EXTMAP_STR "");
|
||||
|
||||
/* push one packet with twcc seqnum 100 on pad0 */
|
||||
fail_unless_equals_int (GST_FLOW_OK,
|
||||
gst_harness_push (h0, generate_test_buffer (offset0, 123, 5)));
|
||||
|
||||
/* add pad1 to the funnel, also with twcc */
|
||||
h1 = gst_harness_new_with_element (h->element, "sink_1", NULL);
|
||||
gst_harness_set_src_caps_str (h1, "application/x-rtp, "
|
||||
"ssrc=(uint)456, extmap-5=" TWCC_EXTMAP_STR "");
|
||||
|
||||
/* push one buffer on both pads, with pad1 starting at a different
|
||||
offset */
|
||||
fail_unless_equals_int (GST_FLOW_OK,
|
||||
gst_harness_push (h0, generate_test_buffer (offset0 + 1, 123, 5)));
|
||||
fail_unless_equals_int (GST_FLOW_OK,
|
||||
gst_harness_push (h1, generate_test_buffer (offset1, 321, 5)));
|
||||
|
||||
/* and verify the seqnums are continuous for all 3 packets, using
|
||||
the inital offset from pad0 */
|
||||
for (i = 0; i < 3; i++) {
|
||||
guint16 seqnum = i + offset0;
|
||||
buf = gst_harness_pull (h);
|
||||
fail_unless_equals_int (seqnum, get_twcc_seqnum (buf, 5));
|
||||
gst_buffer_unref (buf);
|
||||
}
|
||||
|
||||
gst_harness_teardown (h);
|
||||
gst_harness_teardown (h0);
|
||||
gst_harness_teardown (h1);
|
||||
}
|
||||
|
||||
GST_END_TEST;
|
||||
|
||||
static Suite *
|
||||
rtpfunnel_suite (void)
|
||||
{
|
||||
|
@ -187,6 +411,11 @@ rtpfunnel_suite (void)
|
|||
|
||||
tcase_add_test (tc_chain, rtpfunnel_stress);
|
||||
|
||||
tcase_add_test (tc_chain, rtpfunnel_twcc_caps);
|
||||
tcase_add_test (tc_chain, rtpfunnel_twcc_passthrough);
|
||||
tcase_add_test (tc_chain, rtpfunnel_twcc_mux);
|
||||
tcase_add_test (tc_chain, rtpfunnel_twcc_passthrough_then_mux);
|
||||
|
||||
return s;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue