COMMON IMPLEMENTATION OF SYNC AND ASYNC VIDEO PROCESSING
Systems and methods for processing video packets that leave a dejitter buffer of a remote device in a distributed access architecture, in a manner indifferent to whether the remote device is synchronized with, or not synchronized with, a clock in a video core that provides the video packets to the remote device.
1 . A remote device configured for operation in a Distributed Access Architecture and comprising:
a dejitter buffer that receives packets from a video core;
a downstream physical (PHY) device; and
a controller that selectively enables or disables processing of a stream of video packets exiting the dejitter buffer and prior to receipt of the packets by the downstream PHY, based on a measured state of the dejitter buffer.
2 . The remote device of claim 1 comprising either a Remote Physical Device (RPD) or a Remote MACPHY Device (RMD).
3 . The remote device of claim 1 where the measured state of the dejitter buffer comprises a rate of change of a fullness of the dejitter buffer.
4 . The remote device of claim 1 where the processing of the video packets includes at least one of:
adding packets to the video stream;
removing packets from the video stream; and
modifying Program Clock References (PCRs) of one or more packets in the video stream.
5 . The remote device of claim 1 synchronized to a clock of the video core.
6 . The remote device of claim 1 not synchronized to a clock of the video core.
7 . The remote device of claim 1 where the controller selectively enables or disables processing of the stream of video packets based upon comparing the measured state of the dejitter buffer to at least one threshold.
8 . The remote device of claim 7 where the video stream exiting the dejitter buffer is forwarded to the downstream PHY without processing if the magnitude of the measured state is less than the threshold.
9 . The remote device of claim 8 where PCRs of packets of the video stream are modified only when the measured state is greater than the threshold.
10 . The remote device of claim 7 where there are a plurality of thresholds, and packets are either added to or dropped from the video stream based on which threshold is passed.
11 . A method performed in a remote device in a Distributed Access Architecture, the method comprising:
receiving packets into a dejitter buffer and from a video core;
forwarding a stream of packets from the dejitter buffer to a downstream physical (PHY) device; and
prior to forwarding the stream of packets to the downstream PHY device, selectively processing or not processing packets of the video stream that exit the dejitter buffer, based on a measured state of the dejitter buffer.
12 . The method of claim 11 performed in either a Remote Physical Device (RPD) or a Remote MACPHY Device (RMD).
13 . The method device of claim 11 where the measured state of the dejitter buffer comprises a rate of change of a fullness of the dejitter buffer.
14 . The method of claim 11 where the processing of the video packets includes at least one of:
adding packets to the video stream;
removing packets from the video stream; and
modifying Program Clock References (PCRs) of one or more packets in the video stream.
15 . The method of claim 11 performed in a remote device synchronized to a clock of the video core.
16 . The method of claim 11 performed in a remote device not synchronized to a clock of the video core.
17 . The method of claim 11 where processing of the stream of video packets is selectively performed or not performed based upon comparing the measured state of the dejitter buffer to at least one threshold.
18 . The method of claim 17 where the video stream exiting the dejitter buffer is forwarded to the downstream PHY without processing if the magnitude of the measured state is less than the threshold.
19 . The method of claim 18 where PCRs of packets of the video stream are modified only when the measured state is greater than the threshold.
20 . The method of claim 17 where there are a plurality of thresholds, and packets are either added to or dropped from the video stream based on which threshold is passed.