KR20050116633A - Method for adjusting size of video buffer - Google Patents

Abstract

A method of adjusting a video buffer according to a format by reading format related information coming into a video elementary stream (ES) is provided. A video ES having format related information and a format of an input digital signal are stored. Detect the format of the input digital signal. It is determined whether the detected current input digital signal has the same format as the previously input and stored digital signal. According to the determination result, the size of the video buffer is adjusted based on the format related information included in the stored video ES.

Description

How to resize a video buffer {METHOD FOR ADJUSTING SIZE OF VIDEO BUFFER}

The present invention relates to a video buffer size adjusting method, and more particularly, to a method for adjusting the size of a video buffer according to the format of an input digital signal.

Currently, the format of a digital signal transmitted from a Korean broadcasting station is a 1920 * 1080i signal. If the input format is changed on the receiver side, it may not be aware of it, causing a malfunction, and the broadcasting station sends only 1080i signals collectively. This is a case that the video buffer cannot handle. If the size of the video buffer can be adjusted because the format of the input signal can be known, this problem can be solved.

Since the size of the current video buffer is fixed, changing the format of the input digital signal may cause a problem in the buffer.

Accordingly, an object of the present invention is to provide a method of adjusting a video buffer according to a format by reading format-related information coming into a video elementary stream (ES). There is this.

In order to achieve the above object, the present invention comprises the steps of (i) storing the format of the video ES and the input digital signal having the format related information; (ii) detecting the format of the input digital signal; (iii) determining whether the format of the detected current input digital signal is the same as the format of the digital signal stored previously in step (i); And (iv) adjusting the size of the video buffer based on the format related information included in the video ES stored in step (i) according to the determination result of step (iii). Provide a method of adjustment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. A video buffer size adjusting method according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a block diagram showing the configuration of a video buffer size adjusting apparatus that can be applied to the present invention. 2 is a flowchart illustrating a video buffer size adjusting method according to a preferred embodiment of the present invention.

The memory 102 stores the video ES having format related information and the format of the input digital signal (step S201).

[Table 1] is a Sequence Header Constraints, which lists the allowed values for each of the ISO / IEC 13818-2 syntax elements (limit imposed by MP @ HL).

TABLE 1

Sequence header syntax element Allowed value Horizontal size value See Table 2 Vertical size value See Table 2 Astro non-information See Table 2 Frame rate code See Table 2 Bit rate value (<= 19.4 Mbps) <= 48500 Bit rate value (<= 38.8 Mbps) <= 97000 vbv buffer size value <= 488

Table 2 shows the compression format constraints.

TABLE 2

Vertical size value Horizontal size value Astro non-information Frame rate code Progress Sequence 1080 1920 1, 3 1, 2, 4, 5,4, 5 One 0 720 1280 1, 3 1, 2, 4, 5, 7, 8 One 480 704 2, 3 1, 2, 4, 5, 7, 8 One 4, 5 0 640 1, 2 1, 2, 4, 5, 7, 8 One 4, 5 0

Table 3 shows a legend for MPEG-2 encoded values.

TABLE 3

Aspect_ratio_information 1 = squire sample 2 = 4: 3 display aspect ratio 3 = 16: 9 display aspect ratio Frame_ratio_code 1 = 23.976 Hz 2 = 24 Hz 4 = 29.97 Hz 5 = 30 Hz 7 = 59.94 Hz 8 = 60 Hz Progressive_sequence 0 = interlaced scan 1 = progressive_scan

The detection unit 104 detects the format of the input digital signal (step S202).

The determination unit 106 determines whether the format of the current input digital signal detected by the detection unit 104 is the same as the format of the digital signal previously input and stored in the memory 102 (step S203).

As a result of the determination in step S203, when the format of the current input digital signal is previously input and the format of the digital signal stored in the memory 102 is different, the video is based on the format related information provided in the video ES stored in the memory 102. The size of the buffer 110 is adjusted (step S204).

Although the present invention has been described as a specific preferred embodiment, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the gist of the present invention as claimed in the claims. Anyone with a variety of variations will be possible.

According to the present invention, the size of the video buffer can be adjusted according to the format of the input digital signal.

1 is a block diagram showing the configuration of a video buffer size adjusting apparatus that can be applied to the present invention.

2 is a flowchart illustrating a video buffer size adjusting method according to a preferred embodiment of the present invention.

<Description of Signs for Main Parts of Drawings>

102: memory 104: detector

      106: determination unit 108: size adjustment unit

110: video buffer

Claims (1)

(i) storing the format of the input digital signal and the video ES having format related information; (ii) detecting the format of the input digital signal; (iii) determining whether the format of the detected current input digital signal is the same as the format of the digital signal stored previously in step (i); And (iv) adjusting the video buffer size according to the determination result of step (iii), based on the format related information provided in the video ES stored in step (i). Way.