Apparatuses, methods, and content distribution system for transcoding bitstreams using first and second transcoders

• US 10,341,673 B2
• Filed: 05/08/2013
• Issued: 07/02/2019
• Est. Priority Date: 05/08/2013
• Status: Active Grant

• Current Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Original Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Inventors: Pearson, Eric C.
• Primary Examiner(s): Vaughn, Jr., William C
• Assistant Examiner(s): Towe, Joseph Daniel A
• Application Number:
  US13/889,778
• Publication Number:
  US 20140334532A1
• Time in Patent Office: 2,246 Days
• Field of Search: 37524001-24003
• CPC Class Codes: H04N 19/40 using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Abstract

Examples of systems, apparatuses, and methods for to transcoding a bitstream are described herein. An example content distribution system may include an interconnect configured to provide encoded video data from an encoder to a decoder. The interconnect is configured to receive a bitstream including the encoded video data from the encoder. The bitstream is encoded using a first lossless coding methodology. The interconnect including a transcoder configured to transcode the bitstream using a second lossless coding methodology to provide a transcoded bitstream.

Claims

1. An apparatus comprising:

an interconnect configured to (i) provide encoded video data from an encoder to a decoder and (ii) receive an input bitstream including the encoded video data from the encoder, the interconnect comprising;

a communication link;

a first transcoder configured to (i) detect a type of lossless coding methodology used to generate the input bitstream, (ii) generate intermediate video data by (a) transcoding the encoded video data using a second lossless coding methodology responsive to detecting that the input bitstream is generated using a first lossless coding methodology, (b) copying the encoded video data responsive to detecting that the input bitstream is generated using the second lossless coding methodology and (c) copying the encoded video data responsive to detecting that the input bitstream is generated using a third coding methodology and (iii) transmit the intermediate video data in the communication link, wherein the second lossless coding methodology is different than the third coding methodology; and

a second transcoder located proximate to the decoder and in a different facility remote from the first transcoder, and configured to (i) receive the intermediate video data from the communication link, (ii) receive a signal from the decoder, (iii) detect a type of lossless coding methodology used to generate the intermediate video data and (iv) generate output video data by (a) transcoding the intermediate video data to recreate the input bitstream with the first lossless coding methodology responsive to the signal indicating that the decoder is capable of decoding with the first lossless coding methodology, (b) copying the intermediate video data with the second lossless coding methodology responsive to the signal indicating that the decoder is capable of decoding with the second lossless coding methodology and (c) skipping the transcoding of the intermediate video data responsive to determining that both (1) the intermediate video data is generated using the third coding methodology and (2) the signal indicates that the decoder is capable of decoding with the third coding methodology.

2. The apparatus of claim 1, wherein the first transcoder is further configured to (i) extract an elementary bitstream comprising the encoded video data from the input bitstream, wherein the elementary bitstream is generated using the first lossless coding methodology and (ii) transcode the encoded video data in the elementary bitstream using the second lossless coding methodology to provide the intermediate video data.

3. The apparatus of claim 1, wherein (i) the first lossless coding methodology is a non-arithmetic coding methodology, and (ii) the second lossless coding methodology is an arithmetic coding methodology.

4. The apparatus of claim 1, wherein (i) the first lossless coding methodology is a context-adaptive variable length coding methodology, and (ii) the second lossless coding methodology is a context-adaptive binary arithmetic coding methodology.

5. The apparatus of claim 1, wherein the encoder is unable to encode the input bitstream using the second lossless coding methodology.

14. The apparatus according to claim 1, wherein the second transcoder is further configured to (i) detect the type of lossless coding methodology used to generate the intermediate video data and (ii) skip the transcode of the intermediate video data responsive to detecting that both (a) the intermediate video data is generated using a coding methodology other than the second lossless coding methodology and (b) the signal indicates that the decoder is capable of decoding with the coding methodology other than that second lossless coding methodology.

15. The apparatus according to claim 2, wherein the first transcoder is further configured to (i) extract encoded non-video data from the input bitstream, wherein the encoded non-video data is generated using the first lossless coding methodology, (ii) insert the intermediate video data and the encoded non-video data into an intermediate bitstream and (iii) transmit the intermediate bitstream in the communication link to the second transcoder.

16. The apparatus according to claim 15, wherein (i) the intermediate bitstream transported across the communication link comprises a plurality of packets, (ii) one or more of the packets are generated with the first lossless coding methodology and (iii) one or more of the packets are transcoded to the second lossless coding methodology.

17. The apparatus according to claim 4, wherein the third coding methodology is a Huffman compression methodology.

6. A method for content distribution, comprising the steps of:

receiving at an interconnect an input bitstream including encoded video data from an encoder, the interconnect comprising (i) a first transcoder, (ii) a communication link and (iii) a second transcoder located proximate to a decoder and in a different facility remote from the first transcoder;

detecting with the first transcoder a type of lossless coding methodology used to encode the input bitstream;

generating intermediate video data by (a) transcoding the encoded video data using a second lossless coding methodology responsive to the first transcoder detecting that the input bitstream is generated using a first lossless coding methodology, (b) copying the encoded video data responsive to detecting that the input bitstream is generated using the second lossless coding methodology and (c) copying the encoded video data responsive to detecting that the input bitstream is generated using a third coding methodology, wherein the second lossless coding methodology is different than the third coding methodology;

transmitting the intermediate video data in the communication link from the first transcoder to the second transcoder;

receiving the intermediate video data at the second transcoder from the communication link;

receiving a signal at the second transcoder from the decoder;

detecting a type of lossless coding methodology used to generate the intermediate video data; and

generating output video data with the second transcoder by (a) transcoding the intermediate video data to recreate the input bitstream with the first lossless coding methodology responsive to the signal indicating that the decoder is capable of decoding with the first lossless coding methodology, (b) copying the intermediate video data with the second lossless coding methodology responsive to the signal indicating that the decoder is capable of decoding with the second lossless coding methodology and (c) skipping the transcoding of the intermediate video data responsive to determining that both (1) the intermediate video data is generated using the third coding methodology and (2) the signal indicates that the decoder is capable of decoding with the third coding methodology.

7. The method of claim 6, further comprising the steps of:

detecting with the second transcoder the type of lossless coding methodology used to generate the intermediate video data; and

skipping the transcode of the intermediate video data in the second transcoder responsive to detecting that both (a) the intermediate video data is generated using a coding methodology other than the second lossless coding methodology and (b) the signal indicates that the decoder is capable of decoding with the coding methodology other than that second lossless coding methodology.

8. The method of claim 6, wherein (i) the first lossless coding methodology is a context-adaptive variable length coding methodology, and (ii) the second lossless coding methodology is a context-adaptive binary arithmetic coding methodology.

9. The method of claim 6, wherein the encoder which generated the input bitstream is unable to encode the input bitstream using the second lossless coding methodology.

10. The method of claim 6, wherein (i) the first lossless coding methodology is a context-adaptive variable length coding methodology, and (ii) the second lossless coding methodology is a context-adaptive binary arithmetic coding methodology.

11. The method according to claim 7, further comprising the steps of:

extracting with the first transcoder an elementary bitstream comprising the encoded video data from the input bitstream, wherein the elementary bitstream is generated using the first lossless coding methodology; and

transcoding the elementary bitstream using the second lossless coding methodology to provide the intermediate video data.

12. The method according to claim 11, further comprising the steps of:

extracting encoded non-video data from the input bitstream with the first transcoder, wherein the encoded non-video data is generated using the first lossless coding methodology;

inserting the intermediate video data and the encoded non-video data into an intermediate bitstream; and

transmitting the intermediate bitstream in the communication link from the first transcoder to the second transcoder.

13. The method according to claim 12, wherein (i) the intermediate bitstream transported across the communication link comprises a plurality of packets, (ii) one or more of the packets are generated with the first lossless coding methodology and (iii) one or more of the packets are transcoded to the second lossless coding methodology.

18. The method according to claim 8, wherein the third coding methodology is a Huffman compression methodology.