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Decoder and method for realizing random access

A random access and decoder technology, applied in video compression codec, audio and video fields, can solve problems such as the complexity of decoder processing mechanism, and achieve the effect of simplicity and high flexibility

Active Publication Date: 2011-08-24
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the embodiments of the present invention is to provide a method and a decoder for realizing random access, aiming to solve the problem in the prior art that the decoder processing mechanism is complicated when there are multiple reference frames in the inter-frame predictive coding image

Method used

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  • Decoder and method for realizing random access
  • Decoder and method for realizing random access
  • Decoder and method for realizing random access

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: Encoding the prediction characteristic parameter indicating the inter-frame coded image in the I frame header

[0049] In the I frame header, two flag bits are introduced to respectively indicate whether the subsequent P frame and B frame of the I frame refer to the frame preceding the I frame. If there is no B or P frame in the code stream, these fields may not be interpreted.

[0050] When implementing random access to the code stream, the above two flag bits are used to indicate the prediction reference characteristics of the inter-frame coded image of the decoder, which are divided into two cases as follows:

[0051] (1) When Closed_P_flag=1, when indicating that the P frame after the I frame does not refer to the frame before the I frame, the decoder can correctly decode the P frame. For the processing of the subsequent B frame, there are two situations as follows:

[0052] When Closed_B_flag=1, it indicates that the B frame does not refer to the fra...

Embodiment 2

[0082] Embodiment 2: Encoding the prediction characteristic parameter indicating the inter-coded image in the GOP header

[0083] First of all, it is necessary to introduce the above two flags Closed_P_flag and Closed_B_flag into MPEG-2 GOP to replace the original closed_gop flag of MPEG-2 GOP, and redefine the meaning of broken_link to adapt to the occasion of multiple reference frames.

[0084] 1) Redefine the new graph group GOP header as follows

[0085] GOP_header

[0086] {

[0087] Time_code

[0088] Closed_P_flag

[0089] Closed_B_flag

[0090] Broken_link

[0091]}

[0092] The time_code (please add Chinese notes) still uses the original definition in MPEG-2 GOP, it is mainly used in video tape recorders, and is not used in the decoding process.

[0093] 2) Redefine the meaning of the Broken_link flag bit

[0094] Broken_link is used for auxiliary editing. The default value is 0. When it is set to 1, it means that the connection relationship between the two GOP...

Embodiment 3

[0105] Embodiment 3: Predictive reference characteristic parameters are respectively carried in specific syntax elements and predictive encoding image headers

[0106] The prediction reference characteristic parameter indicating the inter-coded image P is carried in specific syntax elements. Whether these specific syntax elements appear indicates whether the subsequent P frame of the I frame refers to the previous frame of the I frame. These specific syntax elements should be located before the I-frame, including the group-of-picture header, sequence header, or user-defined Header. The user-defined header should start with the startcode, and the content can be empty.

[0107] The prediction reference characteristic parameter indicating the inter-coded image B is carried in the image header of the B frame. In the header of the B frame, a flag bit Closed_B_flag is introduced to indicate whether the subsequent B frame of the I frame refers to the frame before the I frame. If the...

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Abstract

The present invention provides a method and a decoder for implementing arbitrary access, the method comprises the following steps: a. receiving bit stream carrying with predictive characteristic parameters, which is used for indicating predictive reference characteristic of forward predictive coding image P frame and bidirectional predictive coding image B frame after intraframe coding image I frame; b. analyzing the predictive characteristic parameters, decoding the image frame of the bit stream according to the predictive characteristic parameters. The technical scheme of the embodiment is capable of supporting arbitrary access of compression code stream under multi-reference frame condition, and the technical scheme which can be implemented simply and has excellent adaptability can set the compromise between the coding efficiency and arbitrary access performance according to various application occasion.

Description

technical field [0001] The invention belongs to the technical field of audio and video, in particular to the technical field of video compression codec. Background technique [0002] In the past 20 years, video compression coding technology has been continuously developed, and new video compression coding standards are also emerging. At present, video compression coding technology is developing towards higher coding compression efficiency, better network compatibility, wider application fields and better user experience. [0003] Video coding standards pursue higher coding and compression efficiency, but at the same time must also consider the random access performance of the compressed code stream. Random access performance refers to the ability to decode the bitstream and restore the decoded image from a certain point rather than the starting point of the bitstream, which is directly related to the user experience. Random access performance and coding efficiency are in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/32
CPCH04N19/00884H04N19/0003H04N19/00715G11B27/3027G11B27/034H04N19/70H04N19/107H04N19/573
Inventor 林永兵
Owner HUAWEI TECH CO LTD
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