[gst-devel] gstrtpbin and rtph264depay linking problem
Qin Chen
eric.qin.chen at gmail.com
Mon Mar 1 18:55:25 CET 2010
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(gstrtpbin, 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
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
> 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
> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>
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