Granted Patent B2

US 10,080,050 · App. 15/157,516 · Granted Sep 18, 2018

Abstract

Claims (50)

1. A method by an encoding apparatus for converting a packet clock reference (PCR) time interval into a PCR bit interval for insertion of a clock reference during packetization of an encoded data stream, the method comprising:

for a plurality of bytes leaving a packetizer, calculating, by the encoding apparatus, a time duration for when each byte is expected to leave the buffer;

adding, by the encoding apparatus, the calculated time durations for each of the plurality of bytes to determine a total accrued time;

determining, by the encoding apparatus, that the total accrued time has reached a preset PCR time interval; and

in response to the total accrued time reaching the preset PCR time interval, generating, by the encoding apparatus, an insert PCR signal for insertion of the clock reference into the data stream.

2. The method of claim 1 , further comprising storing, by the encoding apparatus, a value of each bit rate applied during encoding and the time duration.

3. The method of claim 2 , wherein:

determining a total accrued time comprises monitoring a volume of data packetized; and

generating the insert PCR signal comprises generating the insert PCR signal when the volume of data packetized since a last clock reference insertion is equal to an oldest entry in the stored values.

4. The method of claim 1 , wherein the generation of the insert PCR signal for the insertion of the clock reference into the data stream is performed during packetization and the method further comprises:

buffering the data stream after the insertion of the clock reference into the data stream.

5. The method of claim 1 , comprising:

receiving video data; and

encoding the received video data at the applied bit rate to generate the data stream.

6. The method of claim 1 , wherein the method further comprises, upon a sum of the time durations being greater than or equal to a clock reference time interval:

store the value of any remainder duration for a last applied bit rate in excess of the preset PCR time interval together with the value of the bit rate.

7. An encoding apparatus for converting a packet clock reference (PCR) time interval into a PCR bit interval for insertion of a clock reference during packetization of an encoded data stream, the encoding apparatus comprising:

a memory arranged to store a plurality of time durations, each time duration being associated one of a plurality of bytes leaving a packetizer; and

a processor operable to:

for the plurality of bytes leaving the packetizer, calculate a time duration for when each byte is expected to leave the buffer;

add the calculated time durations for each of the plurality of bytes to determine a total accrued time;

determine that the total accrued time has reached a preset PCR time interval; and

in response to the total accrued time reaching the preset PCR time interval, generate an insert PCR signal for insertion of the clock reference into the data stream.

8. The encoding apparatus of claim 7 , wherein the memory is further arranged to store a value of each bit rate applied during encoding and the time duration.

9. The encoding apparatus of claim 8 , wherein:

determining a total accrued time comprises monitoring a volume of data packetized; and

generating the insert PCR signal comprises generating the insert PCR signal when the volume of data packetized since a last clock reference insertion is equal to an oldest entry in the stored values.

10. The encoding apparatus of claim 7 , wherein the generation of the insert PCR signal for the insertion of the clock reference into the data stream is performed during packetization and the method further comprises:

buffering the data stream after the insertion of the clock reference into the data stream.

11. The encoding apparatus of claim 7 , wherein the processor is further operable to:

receive video data; and

encode the received video data at the applied bit rate to generate the data stream.

12. The encoding apparatus of claim 7 , wherein the processor is further operable, upon a sum of the time durations being greater than or equal to a clock reference time interval, to:

store the value of any remainder duration for a last applied bit rate in excess of the preset PCR time interval together with the value of the bit rate.

13. A non-transitory computer-readable storage medium storing instructions, which, when executed by a processor, causes the processor to:

for the plurality of bytes leaving a packetizer, calculate a time duration for when each byte is expected to leave the buffer;

add the calculated time durations for each of the plurality of bytes to determine a total accrued time;

determine that the total accrued time has reached a preset PCR time interval; and

in response to the total accrued time reaching the preset PCR time interval, generate an insert PCR signal for insertion of the clock reference into the data stream.

14. The non-transitory computer-readable storage medium of claim 13 , wherein, when executed, the instructions are further configured to cause the processor to store a value of each bit rate applied during encoding and the time duration.

15. The non-transitory computer-readable storage medium of claim 14 , wherein:

determining a total accrued time comprises monitoring a volume of data packetized; and

generating the insert PCR signal comprises generating the insert PCR signal when the volume of data packetized since a last clock reference insertion is equal to an oldest entry in the stored values.

16. The non-transitory computer-readable storage medium of claim 13 , wherein the generation of the insert PCR signal for the insertion of the clock reference into the data stream is performed during packetization and instructions, when executed, are further configured to cause the processor to:

buffer the data stream after the insertion of the clock reference into the data stream.

17. The non-transitory computer-readable storage medium of claim 13 , wherein, when executed, the instructions are further configured to cause the processor to:

receive video data; and

encode the received video data at the applied bit rate to generate the data stream.

18. The non-transitory computer-readable storage medium of claim 13 , wherein, upon a sum of the time durations being greater than or equal to a clock reference time interval the instructions are further configured, when executed, to cause the processor to:

store the value of any remainder duration for a last applied bit rate in excess of the preset PCR time interval together with the value of the bit rate.

Assignments (8)