Signaling for entry point frames with predicted first field

• US 20050152448A1
• Filed: 11/15/2004
• Published: 07/14/2005
• Est. Priority Date: 09/07/2003
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Crinon, Regis J., Srinivasan, Sridhar, Regunathan, Shankar, Holcomb, Thomas W.
• Granted Patent: US 7,609,762 B2
• Time in Patent Office: Days
• US Class Current: 375/240.10
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• CPC Class Codes: H04N 21/23424 involving splicing one content stream with another content stream, e.g. for inserting or substituting an advertisement
• CPC Class Codes: H04N 21/44016 involving splicing one content stream with another content stream, e.g. for substituting a video clip
• CPC Class Codes: H04N 21/8455 involving pointers to the content, e.g. pointers to the I-frames of the video stream

Abstract

A video decoder receives an entry point key frame comprising first and second interlaced video fields and decodes a first syntax element comprising information (e.g., frame coding mode) for the entry point key frame at a first syntax level (e.g., frame level) in a bitstream. The first interlaced video field is a predicted field, and the second interlaced video field is an intra-coded field. The information for the entry point key frame can be a frame coding mode (e.g., field interlace) for the entry point key frame. The decoder can decode a second syntax element at the first syntax level comprising second information (e.g., field type for each of the first and second interlaced video fields) for the entry point key frame.

Claims

1. A method comprising:

for an entry point key frame comprising first and second interlaced video fields, inserting a first syntax element for the entry point key frame at a first syntax level in a bitstream, the first syntax element indicating information for the entry point key frame;

wherein the first interlaced video field in the entry point key frame is a predicted field, and wherein the second interlaced video field in the entry point key frame is an intra-coded field.

2. The method of claim 1 wherein the information indicated by the first syntax element is a frame coding mode for the entry point key frame, and wherein the frame coding mode is field interlace.

3. The method of claim 2 wherein the first syntax element is FCM.

4. The method of claim 2 further comprising inserting a second syntax element at the first syntax level in the bitstream, the second syntax element indicating a field type for each of the first and second interlaced video fields in the entry point key frame.

5. The method of claim 4 wherein the second syntax element is FPTYPE.

6. The method of claim 1 wherein the information indicated by the first syntax element is a field type for each of the first and second interlaced video fields in the entry point key frame.

7. The method of claim 1 further comprising inserting an entry point start code and entry point header before the first syntax element.

8. The method of claim 1 wherein the first syntax level in the bitstream is frame level.

9. One or more computer-readable media having stored thereon computer-executable instructions for performing the method of claim 1.

10. A method comprising:

receiving an entry point key frame comprising first and second interlaced video fields; and

decoding a first syntax element for the entry point key frame at a first syntax level in a bitstream, the first syntax element comprising information for the entry point key frame;

wherein the first interlaced video field in the entry point key frame is a predicted field, and wherein the second interlaced video field in the entry point key frame is an intra-coded field.

11. The method of claim 10 wherein the information for the entry point key frame is a frame coding mode for the entry point key frame, and wherein the frame coding mode is field interlace.

12. The method of claim 11 further comprising decoding a second syntax element at the first syntax level in the bitstream, the second syntax element comprising second information for the entry point key frame.

13. The method of claim 12 wherein the second information comprises a field type for each of the first and second interlaced video fields in the entry point key frame.

14. The method of claim 10 wherein the information comprises a field type for each of the first and second interlaced video fields in the entry point key frame.

15. The method of claim 14 further comprising:

receiving an entry point header and entry point start code associated with the entry point key frame; and

decoding the entry point header and the entry point start code.

16. The method of claim 10 wherein the first syntax level in the bitstream is frame level.

17. The method of claim 10 further comprising:

receiving the entry point key frame in an elementary stream buffer

decoding a start code for the second interlaced video field after extraction of encoded second interlaced video field type from the elementary stream buffer; and

decoding the second interlaced video field;

wherein decoding of the first interlaced video field is omitted after extraction of encoded first interlaced video field type from the elementary stream buffer.

18. One or more computer-readable media having stored thereon computer-executable instructions for performing the method of claim 10.

19. A method comprising:

receiving an entry point key frame comprising first and second interlaced video fields;

decoding a first syntax element for the entry point key frame at frame level in a bitstream, the first syntax element comprising a frame coding mode for the entry point key frame; and

decoding a second syntax element for the entry point key frame at frame level in the bitstream, the second syntax element comprising a field type for each of the first and second interlaced video fields;

wherein the first interlaced video field in the entry point key frame is a predicted field, and wherein the second interlaced video field in the entry point key frame is an intra-coded field.

20. One or more computer-readable media having stored thereon computer-executable instructions for performing the method of claim 19.