CN110430462B

CN110430462B - Fast automatic setting method based on UHD decoder

Info

Publication number: CN110430462B
Application number: CN201910712380.4A
Authority: CN
Inventors: 杜伟庆; 陈诚斌; 吴颜鹏; 苏凯雄; 林莲巧
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2021-08-31
Anticipated expiration: 2039-08-02
Also published as: CN110430462A

Abstract

The present invention relates to a fast automatic setting method based on UHD decoder, comprising the following steps: step S1: at the encoder end, the input data is packaged and multiplexed to form a transport code stream; step S2: the PMT of the transport code stream is modified Adjust, and add private descriptor enc_params in the video loop; Step S3: the encoder outputs the transmission code stream to the transmission module, and enters the transmission module of the decoder side through the wireless channel; Step S4: the decoder side accepts the transmission code output of the encoder end Stream, start decoding; Step S5: the decoder filters the decoding program PMT table at the system layer, analyzes whether there is an enc_params descriptor, if there is an enc_params descriptor, analyzes the enc_params descriptor, and completes setting the decoder parameters; The system layer and the coding layer extract parameters, calculate the non-dominant parameters according to the time series characteristics of the data, and set the decoder. The present invention adopts different analysis and extraction methods according to different results, so as to ensure that the decoder can normally process and decode the code streams output by different encoders.

Description

Fast automatic setting method based on UHD decoder

Technical Field

The invention relates to a rapid automatic setting method based on a UHD decoder.

Background

With the development of the digital information age, people develop the requirements of image data to high speed and high resolution, ultra-high definition video becomes a great trend, and higher requirements are put forward for encoding and decoding of ultra-high definition video transmission.

In addition, some parameters are transmitted at a system layer of the code stream (such as PID, code stream type and the like), some parameters are transmitted at an encoding layer (such as scanning mode, frame rate and the like), and some parameters are not transmitted directly (i.e. non-explicit parameters) (such as delay mode). This causes difficulties in the correct setting of the decoder parameters and inconvenience in practical use.

Disclosure of Invention

In view of this, the present invention provides a fast automatic setting method based on a UHD decoder, which implements different analysis and extraction methods according to different results, and ensures that the decoder can normally process and decode code streams output by different encoders.

In order to achieve the purpose, the invention adopts the following technical scheme:

a fast automatic setup method based on UHD decoder, comprising the steps of:

step S1: at the encoder end, packing input data according to MPEG-2 system standard to form fixed length transmission packets, then multiplexing the data packets to form transmission code stream;

step S2, modifying and adjusting PMT of the transmission code stream by using expansibility, and adding a private descriptor enc _ params in a video loop;

step S3, the encoder outputs the transmission code stream to the transmission module, and enters the transmission module of the decoder end through the wireless channel;

step S4, the decoder receives the transmission code stream output by the encoder and starts decoding;

step S5, the decoder filters and decodes the program PMT table at the system layer, analyzes whether the enc _ params descriptor exists, if so, analyzes the enc _ params descriptor, and completes the setting of the decoder parameters;

if the enc _ params descriptor does not exist, extracting parameters from the system layer and the coding layer respectively, calculating a non-dominant parameter according to the time sequence characteristics of the data, setting a decoder, and finishing the setting of the decoder.

Further, the input data includes compressed UHD video, audio, text, and pictures.

Further, the descriptor enc _ params contains parameter setting information, including a sampling mode, sampling precision, resolution, frame rate, scanning mode, delay mode, and code rate control mode.

Further, the step S2 includes: a private descriptor enc _ params is added in a video loop, the descriptor definition conforms to the ISO/IEC 13818-1 standard, and the PMT segment length, the total length of the secondary descriptor and the cyclic redundancy check field are updated.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts different analysis and extraction methods according to different results, and ensures that the decoder can normally process and decode code streams output by different encoders.

Drawings

FIG. 1 is a flow diagram of the present invention;

FIG. 2 is a block diagram of the system mechanism in one embodiment of the invention.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments.

Referring to fig. 1, the present invention provides a fast automatic setup method based on UHD decoder, comprising the following steps:

step S2, modifying and adjusting PMT of the transmission code stream by using expansibility, and adding a private descriptor enc _ params in a video loop; the descriptor definition follows the ISO/IEC 13818-1 standard, and simultaneously updates the PMT segment length, the total length of the secondary descriptor and the cyclic redundancy check field;

in this embodiment, if there is no enc _ params descriptor, parameters are extracted from the system layer and the coding layer, respectively, and the non-dominant parameter is calculated according to the time sequence characteristics of the data, specifically: the sampling mode, the sampling precision and the resolution ratio all extract corresponding parameters from the coding layer, for frame rate parameters, the encoder does not insert VUI parameters into the coding layer in a low-delay working mode, the decoder records all PTS data in the PES layer within a period of time, generally from 0.5 second to 1 second, then the minimum difference value in the PTS data is counted, and then the specific frame rate is obtained according to the interval where the minimum difference value is located.

In this embodiment, the input data includes video, audio, text, and pictures.

In this embodiment, the descriptor enc _ params includes parameter setting information, which includes a sampling mode, a sampling precision, a resolution, a frame rate, a scanning mode, a delay mode, and a code rate control mode.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims

1. a fast automatic setting method based on UHD decoder, is characterized in that, comprises the following steps:

Step S1: at the encoder end, the input data is packaged according to the MPEG-2 system standard to form a fixed-length transport packet, and then these packets are multiplexed to form a transport stream;

Step S2: utilize the extensibility to modify and adjust the PMT of the transport code stream, and add private descriptor enc_params in the video loop;

Step S3: the encoder outputs the transmission code stream to the transmission module, and enters the transmission module of the decoder end through the wireless channel;

Step S4: the decoder side accepts the transport code stream output by the encoder side, and starts decoding;

Step S5: the decoder filters and decodes the program PMT table at the system layer, analyzes whether there is an enc_params descriptor, if there is an enc_params descriptor, analyzes the enc_params descriptor, and completes setting the decoder parameters;

If there is no enc_params descriptor, parameters are extracted from the system layer and the coding layer respectively, non-dominant parameters are calculated according to the timing characteristics of the data, and the decoder is set; the decoder setting is completed.

2 . The fast automatic setting method based on UHD decoder according to claim 1 , wherein the input data includes compressed UHD video, audio, text and pictures. 3 .

3. The fast automatic setting method based on UHD decoder according to claim 1, is characterized in that: described descriptor enc_params contains parameter setting information, including sampling mode, sampling precision, resolution, frame rate, scanning mode, delay mode and rate control mode.

4. the fast automatic setting method based on UHD decoder according to claim 1, is characterized in that: described step S2 has: add private descriptor enc_params in video loop, and descriptor definition follows ISO/IEC 13818-1 Standard, and update the PMT segment length, the total length of the secondary descriptor and the cyclic redundancy check fields.