CN100367390C - Method for discriminating CD format of CD-RW - Google Patents

Abstract

The invention relates to a method for discriminating CD format of CD-RW, which is used to discriminate the format of data stored in the CD which has not been finalized, and is characterized in that the method comprises the following steps: confirming that the optical disc is not finalized by comparing the directory table on the optical disc with the index data storage area; reading data of a first audio track of the optical disc; classifying the optical disc by whether the data of the first audio track is empty; reading the data of the second audio track of the optical disc; and judging the format of the optical disk by the first five bytes in the thirty-first sector of the second audio track. The invention can effectively judge the format of the unfinalized optical disk and prevent the problem of reading error after recording.

Description

A method for discriminating the disc format of recorder

technical field

The invention relates to a method for discriminating the format of an optical disc, in particular to a method for discriminating the format of an optical disc of a recorder that can automatically perform discrimination without manual input.

Background technique

With the vigorous development of burner technology, CDs have become the most important storage media. According to the data stored, there are many different corresponding formats, such as music CD (CD-DA), laser video disk (Video CD or VCD) , Super VCD or SVCD, CD-ROM, CD-R, and CD-RW.

When the recorder burns a disc, because the capacity of the disc is quite large, it may not be able to fully use its space every time. If it cannot be used after burning once, it will cause considerable waste and greatly affect the applicability of the disc. sex. Therefore, both the recorder and the recording program are designed with unfinalized (or unfinalized), that is to say, after the disc is recorded, the unfinalized process can be used to temporarily end the recording, and the remaining unused space is still available. Available for next burn.

However, this method faces a problem, that is, before burning a disc that has not been finalized, the recorder must first know the format of the previously recorded data in order to continue the continuous recording work. However, the recorder itself cannot automatically Distinguish which format is originally burned, therefore, can only rely on the user to input, so it will cause a considerable burden on the user, must record the format of each disc that has not been finalized, otherwise once the input is wrong, the future There will be read errors in the burned disc, which greatly affects the flexibility of burning the disc.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for discriminating the disc format of a recorder, so as to solve the problem in the prior art that the recorder cannot automatically discriminate the format originally recorded, and needs to be input by the user.

In order to achieve the above object, the present invention provides a method for discriminating the format of an optical disc of a recorder, which is used to discriminate the format of the data stored in the optical disc that has not been finalized, and includes the following steps:

Confirming that the optical disc has not been finalized by comparing the table of contents on the optical disc and the index data storage area are not equal;

read the data of the first audio-visual track of the optical disc;

When the data of the first audio-visual track is empty, the disc is judged to be in CD-DA format;

Read the data of the second audio-visual track of the optical disc; when the first five bytes in the thirty-first sector of the second audio-visual track are 00 00 01 BA 21, it is judged that the optical disc is in VCD format; and

When the first five bytes in the thirty-first sector of the second video and audio track are 00 00 01 BA 44, it is judged that the optical disc is in SVCD format.

The above-mentioned method for discriminating the disc format of a recorder is characterized in that the step of confirming that the disc has not been finalized further includes:

Judging whether the table of contents on the optical disc is equal to the index data storage area, if not, confirming that the optical disc has not been finalized; if yes, further judging whether the table of contents or the index data storage area on the optical disc is Zero, if it is zero, it is judged that a blank disc can be burned, and if it is not zero, it is judged that a disc that has been finalized cannot be burned and can only be read.

The effect of the present invention is that it can effectively judge the format of the optical disc that has not been finalized, and prevent the problem of reading errors after recording.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is a flow chart of steps of the present invention;

Fig. 2 is a flow chart of the steps of confirming the sealing of the optical disc in the present invention;

Fig. 3 is a flow chart of steps for discriminating the format of an optical disc.

Detailed ways

Please refer to FIG. 1 , which is a flow chart of the steps of the present invention, which is mainly used for unfinalized optical discs. As shown in Figure 1, step 101 is first performed to first confirm whether the optical disc has not been finalized. The way of judging it is shown in Figure 2, which is a flow chart of steps for confirming the finalization of the optical disc in the present invention. First, read the TOC and PMA, TOC and PMA are recorded at the beginning of the disc, where TOC is the table of contents (Table of Contents; TOC), and PMA is the index data storage area (Program Memory Area; PMA), and the judgment is made by reading the data of these two parts.

As shown in Figure 2, at first execute step 201, confirm whether TOC is equal to PMA, if not, then step 202, can be judged as unfinalized processing disc; If so, then have two possibilities, step 203, continue to judge its value ( Whether TOC or PMA) is zero, if yes, then step 204 is a blank disc, and normal recording work can be carried out; if not, then step 205 is a finalized disc, and cannot continue to burn it , can only be read.

After being confirmed as an unfinalized optical disc, you need to further confirm its detailed format, then perform step 102, read the data of its first audio-visual track (track), then perform step 103, pass the first audio-visual track The optical disc is roughly divided into two categories based on the data. For the detailed determination method, please refer to FIG. 3, which is a flow chart of the steps for determining the format of the optical disc. Step 301 is first performed to confirm whether the data of the first audio-visual track is empty (blank) , if yes, then step 302, distinguish the optical disc into the first type of format, if not, then step 303, distinguish the optical disc into the second type of format, and in the currently known formats, the optical disc of the first type of format is music Compact disc (CD-DA).

Next, in order to further confirm the detailed format, execute step 104, continue to read the data of the second video and audio track of the optical disc, step 105, and determine the detailed format through its special data and bit content. Referring to Fig. 3 equally, step 304, the data of the special position that it reads, is the first five bytes (leading 5 bytes) in the 31st sector (sector 31) of the second audiovisual track, step 305, if Its bit data is 00 00 01 BA 21 and then it is judged as VCD format (laser video disc (Video CD or VCD)), step 306, if its bit data is 00 00 01 BA 44 then it is judged as SVCD format (super laser video disc (Super VCD) or SVCD)).

After identifying the correct format, the user can input the data to be recorded, and then perform recording. After the recording is completed, it is also necessary to determine whether to perform finalization processing. If so, update the PMA and TOC at the same time. If not, do not perform finalization If it is optimized, you only need to update the PMA, and then it can be used for burning next time.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should all belong to the protection scope of the claims of the present invention.

Claims (2)

1. A method for discriminating the disc format of a recorder, for discriminating the format of the stored data in the disc that has not yet been finalized, it is characterized in that it includes the following steps: Confirming that the optical disc has not been finalized by comparing the table of contents on the optical disc and the index data storage area are not equal; read the data of the first audio-visual track of the optical disc; When the data of the first audio-visual track is empty, the disc is judged to be in CD-DA format; Read the data of the second audio-visual track of the optical disc; when the first five bytes in the thirty-first sector of the second audio-visual track are 00 00 01 BA 21, it is judged that the optical disc is in VCD format; and When the first five bytes in the thirty-first sector of the second video and audio track are 00 00 01 BA 44, it is judged that the optical disc is in SVCD format. 2. The method for discriminating the disc format of a recorder disc according to claim 1, wherein the step of confirming that the disc has not been finalized further comprises: Judging whether the table of contents on the optical disc is equal to the index data storage area, if not, confirming that the optical disc has not been finalized; if yes, further judging whether the table of contents or the index data storage area on the optical disc is Zero, if it is zero, it is judged that a blank disc can be burned, and if it is not zero, it is judged that a disc that has been finalized cannot be burned and can only be read.

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