[gst-devel] gstrtpbin and rtph264depay linking problem
Tiago Katcipis
katcipis at inf.ufsc.br
Mon Mar 1 23:15:07 CET 2010
On Mon, Mar 1, 2010 at 2:55 PM, Qin Chen <eric.qin.chen at gmail.com> wrote:
> Hi Tiago,
>
> Thank you very much for your reply.
>
> I didn't "request" the recv_rtp_src_%d_%d_%d pad. In my codes, I used
> gst_element_link_many(gstrtpbi n, rtpdec, vdec, vconv, vsink, NULL); and
> hope that I can get the "dynamically" created pad. But according to the
> error message, no such pad was created. Any idea? Thanks
but according to the error msg it looks like in some moment you are trying
to get it with a gst_element_get_static_pad:
0:00:00.135657988 5934 0x95aa008 INFO GST_ELEMENT_PADS
gstelement.c:970:gst_element_get_static_pad: no such pad
'recv_rtp_src_%d_%d_%d' in element "gst-rtp-bin"
where is your "pad-added" handler? i think when a pad is added dynamically a
"pad-added" signal is emitted by gstrtpbin.
best regards,
Katcipis
>
>
> Regards,
>
> Qin
>
>
>
> On Mon, Mar 1, 2010 at 7:20 AM, Tiago Katcipis <katcipis at inf.ufsc.br>wrote:
>
>>
>>
>> On Mon, Mar 1, 2010 at 1:24 AM, Qin Chen <eric.qin.chen at gmail.com> wrote:
>>
>>> Hi experts,
>>>
>>> I am trying to write a pipeline for receiving and decoding H.264 RTP
>>> packets. Please see the C codes below. It is basically equivalent to
>>> following pipeline.
>>>
>>> gst-launch -v gstrtpbin name=rtpbin \
>>> udpsrc caps="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264" \
>>>
>>>
>>>
>>> port=5000 ! rtpbin.recv_rtp_sink_0 \
>>> rtpbin. ! rtph264depay ! ffdec_h264 ! xvimagesink \
>>>
>>>
>>>
>>> But I couldn't link gstrtpbin and rtph264depay. The error message is as
>>> follows:
>>> 0:00:00.135605335 5934 0x95aa008 INFO GST_ELEMENT_PADS
>>> gstutils.c:1587:gst_element_link_pads: trying to link element
>>> gst-rtp-bin:(any) to element rtp-decoder:(any)
>>> 0:00:00.135657988 5934 0x95aa008 INFO GST_ELEMENT_PADS
>>> gstelement.c:970:gst_element_get_static_pad: no such pad
>>> 'recv_rtp_src_%d_%d_%d' in element "gst-rtp-bin"
>>> 0:00:00.135679108 5934 0x95aa008 INFO GST_ELEMENT_PADS
>>> gstutils.c:1208:gst_element_get_compatible_pad:<gst-rtp-bin> Could not find
>>> a compatible pad to link to rtp-decoder:sink
>>>
>>> Could someone give me some hints? Why I have no "recv_rtp_src_%d_%d_%d"?
>>
>>
>>
>> http://www.gstreamer.net/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-gstrtpbin.html
>>
>> as you can see the "recv_rtp_src_%d_%d_%d" pad is created dinamically, you
>> cant get it.
>>
>> "To use GstRtpBin<http://gst-plugins-good-plugins-gstrtpbin.html#GstRtpBin> as
>> an RTP receiver, request a recv_rtp_sink_%d pad. The session number must
>> be specified in the pad name. Data received on the recv_rtp_sink_%d pad
>> will be processed in the GstRtpSession<http://gst-plugins-good-plugins-gstrtpsession.html#GstRtpSession> manager
>> and after being validated forwarded on GstRtpSsrcDemux<http://gst-plugins-good-plugins-gstrtpssrcdemux.html#GstRtpSsrcDemux> element.
>> Each RTP stream is demuxed based on the SSRC and send to a
>> GstRtpJitterBuffer<http://gst-plugins-good-plugins-gstrtpjitterbuffer.html#GstRtpJitterBuffer>.
>> After the packets are released from the jitterbuffer, they will be forwarded
>> to aGstRtpSsrcDemux<http://gst-plugins-good-plugins-gstrtpssrcdemux.html#GstRtpSsrcDemux> element.
>> The GstRtpSsrcDemux<http://gst-plugins-good-plugins-gstrtpssrcdemux.html#GstRtpSsrcDemux> element
>> will demux the packets based on the payload type and will create a unique
>> pad recv_rtp_src_%d_%d_%d on gstrtpbin with the session number, SSRC and
>> payload type respectively as the pad name."
>>
>>
>>> Or could someone lead me to similar examples? Thanks in advance!
>>>
>>> Regards,
>>>
>>> Qin
>>>
>>>
>>> static
>>> GstElement* construct_receiver_pipeline( void){
>>> GstElement *pipeline, *gstrtpbin, *vdec, *rtpdec, *vsink;
>>> GstElement *jitterbuf, *vconv;
>>> GstElement *udpsrc_rtp;
>>> GstCaps *caps;
>>> GstPad *pad;
>>> gboolean err;
>>> GstPadLinkReturn res;
>>>
>>> //Create gstrtpbin
>>> gstrtpbin = gst_element_factory_make(" gstrtpbin", "gst-rtp-bin");
>>> if ( !gstrtpbin ) {
>>> g_printerr("Failed to create gstrtpbin\n");
>>> return 0;
>>> }
>>> g_object_set(G_OBJECT (jitterbuf), "latency", jitter_latency, NULL);
>>>
>>> //RTP ource initialization
>>> udpsrc_rtp = gst_element_factory_make(" udpsrc", "udp-udpsrc_rtp");
>>> if ( !udpsrc_rtp ) {
>>> g_printerr("Failed to create udpsrc\n");
>>> return 0;
>>> }
>>> g_object_set(G_OBJECT (udpsrc_rtp), "port", rtp_port, NULL);
>>> //gst_caps_new_simple and gst_element_linked_filter don't work
>>> g_object_set(G_OBJECT (udpsrc_rtp), "caps",
>>> gst_caps_from_string(" application/x-rtp, "
>>> "clock-rate=(int)90000, "
>>> "payload=(int)96, "
>>> "media=(string)video, "
>>> "encoding-name=(string)H264"), NULL);
>>>
>>> //Create video decoder
>>> vdec = gst_element_factory_make( vdecoder, "video-decoder");
>>> if ( !vdec ) {
>>> g_printerr("Failed to create %s\n", vdecoder);
>>> return 0;
>>> }
>>>
>>> //Choose RTP decoder according to video codec
>>> rtpdecoder = g_strdup(select_rtp_decoder( vdecoder));
>>> g_free(vdecoder);
>>>
>>> //Create rtp decoder
>>> rtpdec = gst_element_factory_make( rtpdecoder, "rtp-decoder");
>>> if ( !rtpdec ) {
>>> g_printerr("Failed to create %s\n", rtpdecoder);
>>> return 0;
>>> }
>>>
>>> //Create video converter
>>> vconv = gst_element_factory_make(" ffmpegcolorspace",
>>> "video-converter");
>>> if ( !vconv ) {
>>> g_printerr("Failed to create ffmpegcolorspace\n");
>>> return 0;
>>> }
>>>
>>> //Create video sink
>>> vsink = gst_element_factory_make(" xvimagesink", "video-sink");
>>> if ( !vsink ) {
>>> g_printerr("Failed to create xvimagesink\n");
>>> return 0;
>>> }
>>>
>>> /* Set up the pipeline */
>>> gst_bin_add_many(GST_BIN (pipeline), udpsrc_rtp, gstrtpbin/*,
>>> jitterbuf*/,
>>> rtpdec, vdec, vconv, vsink, NULL);
>>>
>>> //link udpsrc_rtp to gstrtpbin
>>> pad = gst_element_get_request_pad( gstrtpbin, "recv_rtp_sink_%d");
>>> if ( !pad ) {
>>> g_printerr("Failed to create pad\n");
>>> return 0;
>>> }
>>> res = gst_pad_link(gst_element_get_ pad(udpsrc_rtp, "src"), pad);
>>> gst_object_unref(GST_OBJECT (pad));
>>> if ( GST_PAD_LINK_FAILED(res) ) {
>>> g_printerr("Failed to link pads\n");
>>> return 0;
>>> }
>>>
>>> err = gst_element_link_many( gstrtpbin, rtpdec, vdec, vconv, vsink,
>>> NULL);
>>> if ( err==FALSE ) {
>>> g_printerr("Failed to link elements\n");
>>> return 0;
>>> }
>>>
>>> return pipeline;
>>> }
>>>
>>>
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>>
>> ------------------------------
>> ------------------------------------------------
>> Download Intel® Parallel Studio Eval
>> Try the new software tools for yourself. Speed compiling, find bugs
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>>
>>
>
>
> ------------------------------------------------------------------------------
> Download Intel® Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>
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