[gst-devel] gstrtpbin and rtph264depay linking problem
Qin Chen
eric.qin.chen at gmail.com
Tue Mar 2 20:03:11 CET 2010
Hi Tiago,
I added a callback for pad-added. Now it works. Thanks for the help.
Regards,
Qin
On Mon, Mar 1, 2010 at 5:15 PM, Tiago Katcipis <katcipis at inf.ufsc.br> wrote:
>
>
> 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;
>>>> }
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> 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
>>>>
>>>>
>>>
>>> ------------------------------
>>> ------------------------------------------------
>>> 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
>>>
>>>
>>
>>
>> ------------------------------------------------------------------------------
>> 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
>>
>>
>
>
> ------------------------------------------------------------------------------
> 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20100302/9f81e323/attachment.htm>
More information about the gstreamer-devel
mailing list