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TSN streams are expected to send packets to the network in a well defined "pace", which is arbitrarily defined for each stream. This pace is defined by the "measurement interval" property of a stream. When the AVTP CVF payloader element - avtpcvfpay - fragments a video frame that is too big to be sent to the network, it currently defines that all fragments should be transmitted at the same time (via DTS property of GstBuffers generated, as sink will use those to time the transmission of the AVTPDU). This doesn't comply with stream definition, which also has a limit on how many packets can be sent on a given measurement interval. This patch solves that by spreading in time the DTS of the GstBuffers containing the AVTPDUs. Two new properties, "measurement-interval" and "max-interval-frames", added to avptcvfpay element so that it knows stream measurement interval and how many AVTPDUs it can send on any of them. More details on the method used to proper spread DTS/PTS according to measurement interval can be found in a code commentary inside this patch. Tests also added for the new property and behaviour. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1004> |
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