How to get RTCP sender report from rtspsrc element?

[이병헌]

Awesome, thanks!!!
You saved me

And.. If you okay, and if you have, can you recommand me some papers or
document to understand more deep about gstreamer?
I tried myself with gstreamer official document in website, but in some
cases, I got a feeling that stucked at a wall of knowledge...

Anyway whether you recommand it to me or not,
Thank you.


2021년 8월 31일 (화) 오후 10:19, Ben Rush <ben at ben-rush.net>님이 작성:

> Hello
>
> On Tue, Aug 31, 2021 at 1:30 AM 이병헌 via gstreamer-devel <
> gstreamer-devel at lists.freedesktop.org> wrote:
>
>> Hi.
>> I’m new on gstreamer, and I have some problem with this issue for many
>> days..
>>
>> I need to get absolute timestamp from multiple rtsp camera.
>> And with some effort, I got to know that I can get absolute timestamp
>> from "RTCP SR(sender report)” in RTSP packets
>> But I can not find the proper way to get RTCP SR from rtspsrc element or
>> rtpbin in gstreamer document..
>> And actually I can not understand well about rtpbin’s role
>> So my questions are
>>
>> 1. How to get RTCP SR with rtspsrc element or rtpbin element
>>
>
> With your pipeline, get the GstRTPSession:
>
> rtpSession = gst_bin_get_by_name(GST_BIN(_pipeline->pipeline),
> "rtpsession0");
>
> Get the internal RTPSession from it:
>
> GstElement* internalRtpSession;
> g_object_get(rtpSession, "internal-session", &internalRtpSession, NULL);
>
> Connect to on-receiving-rtcp:
>
> g_signal_connect(internalRtpSession, "on-receiving-rtcp",
> G_CALLBACK(on_rtcp_callback), NULL);
>
> Iterate over the RTCP packets in the buffer:
>
> GstRTCPBuffer rtcpBuffer = GST_RTCP_BUFFER_INIT;
> gst_rtcp_buffer_map(buffer, GST_MAP_READ, &rtcpBuffer);
> GstRTCPPacket rtcpPacket;
> if (gst_rtcp_buffer_get_first_packet(&rtcpBuffer, &rtcpPacket))
> {
> while (gst_rtcp_packet_move_to_next(&rtcpPacket))
> {
> GstRTCPType type = gst_rtcp_packet_get_type(&rtcpPacket);
>
>>
>> 2. If I connect devices into rtpbin element, then does rtpbin sync
>> sources from multiple device automatically?
>> I mean, suppose If there are two rtsp camera CAM_1 CAM_2, and if I send
>> PLAY request in same time on my client
>> And if there have network delay, so client get packets of PLAY request of
>> CAM_1 10 seconds more later than CAM_2
>> Then does rtpbin element sync that 10 seconds automatically?
>>
>
> I'm not sure.
>
>
>>
>> Thanks for reading.
>
>
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