CN100433166C - MP3 file generating method and playing method for generated MP3 file - Google Patents

Abstract

The MP3 file generating method comprises the following steps: 1) segmenting the voice data in the MP3 file; 2) generating a corresponding MP3 address table according to the addresses of the segments in the voice data; 3) combining the address table, voice data and file tags creates an MP3 file with an address table. The MP3 file generated by the method has the address table corresponding to the position of each segment, so that the playing tool can accurately position the position of each segment for playing. The invention also provides a playing method of the MP3 file with the address table.

Description

Method for generating MP3 files and method for playing the generated MP3 files

technical field

The present invention relates to a method for generating MP3 files with voice data segmented and a method for playing the segmented MP3 files.

Background technique

MPEG (Moving Picture Experts Group) Chinese name is Moving Picture Experts Group, which is a moving audio and video compression standard, and MP3 refers to the third layer (Layer-3) of the MPEG voice layer. The existing MP3 files are composed of file tags and voice data It consists of two parts, where the file label records information such as author, title, album, etc. as shown in the following table:

ID3V2 Currently common file tags, including author, composer, album and other information, the length is not fixed Frame...Frame Voice data, expressed as a series of frames, the number is determined by the file size and frame length. The length of each FRAME may not be fixed or may be fixed. It is determined by the bit rate. Each FRAME is divided into two parts: frame header and data entity. The frame header records the bit rate, sampling rate, version and other information of mp3, and each frame is independent of each other ID3V1 The old file tag, which has been replaced by ID3V2, contains information such as author, composer, album, etc., and the length is 128BYTE.

When playing multiple MP3 files, the playback software recognizes the position of the voice data part of each MP3 file (corresponding to a song or other voice) through the file label, and can quickly switch and play any MP3 file according to the user's command. The limitation is that after switching, the selected song can only be played from the beginning, and it cannot specify a position in the song to start playing.

Contents of the invention

The purpose of the present invention is to provide an MP3 file that can specify a position in the voice data to start playing.

Another object of the present invention is to provide a playing method for playing this MP3 file.

The present invention provides the generating method of MP3 file, and its step comprises:

1) voice data in the MP3 file is segmented;

2) generate a corresponding MP3 address table according to the address of each segment in the voice data;

3) Combine address table, voice data and file label to generate MP3 file with address table.

Since the MP3 file generated by this method has an address table corresponding to the position of each segment, it can be used by the playback tool to accurately locate the position of each segment for playback.

The present invention also provides the playing method to the MP3 file of above-mentioned band address list, and its step comprises:

A) receiving a playback command requiring playback of a specified location;

B) find the address corresponding to the designated location in the address table of the MP3 file;

C) Play MP3 audio data from this address.

Because the playback tool finds the segment address corresponding to this segment according to the address table in the MP3 file, the user only needs to specify one of the segments in the MP3 file, and the playback tool can find the corresponding address and start playing at the specified position.

Description of drawings

Fig. 1 is the flowchart of the generation method of MP3 file;

Fig. 2 is the flowchart of the playing method to the generated MP3 file;

Fig. 3 is a flow chart of the playback method of Embodiment 1;

Figure 4 is an implementation diagram of generating and playing MP3 files in Embodiment 1.

Detailed ways

Embodiment one

As shown in Fig. 1, the generation method of MP3 file, its step comprises:

1) voice data in the MP3 file is segmented;

2) generate a corresponding MP3 address table according to the address of each segment in the voice data;

3) Combine the address table, voice data and file tags to generate an MP3 file with an address table.

The generated MP3 file structure is as follows:

0x00--0x08 0x09--0x0A 0x0B--N*5 ... ...

file label address table size address table data MP3 voice data ID3V1 (can be omitted)

As shown in Fig. 2, to the playing method of the MP3 file of above-mentioned band address table, its step comprises:

A) receiving a playback command requiring playback of a specified location;

B) find the address corresponding to the designated location in the address table of the MP3 file;

C) Play MP3 voice data from this address.

Among them, in step A), various forms of commands can be received, such as making multiple corresponding readable codes (such as barcodes) according to each segment in advance, and the user operates the code reader (such as a photoelectric pen) to read the readable code conversion The corresponding command with the specified position is input to the player, and the player uses the specified position as an index to find out the corresponding address, and then the MP3 voice data can be played; Input the location information to be played through the button or the touch screen, and the player can find out the corresponding address according to the location information, and then play the MP3 voice data. As shown in Figure 3.

The implementation process of this embodiment can refer to Figure 4.

Embodiment two

Use the voice editing software WINONCD to segment the MP3 file to generate a segmented file in CD format. In order to generate an address table corresponding to the voice data in the MP3 file, it is necessary to convert the segment address in CD format into an address in MP3 format , the conversion principle is as follows:

MP3 address=(MP3 frame length MP3 frame rate) playing time;

CD address=(CD frame length CD frame rate) playing time;

Regardless of generating files with MP3 format, CD format or other formats, the playing time of the same voice data is certain, so the "playing time" variable is eliminated in conjunction with the above two formulas, and it can be obtained: MP3 address=(CD address· MP3 frame length)/(MP3 frame time·CD frame rate·CD frame length);

Since the MP3 frame length, MP3 frame time, CD frame rate and CD frame length are all constant, the CD address of the specified location data can be converted into an MP3 address, an MP3 address table is generated, and then the address table is embedded in the original MP3 file Generate MP3 file with address table.

In the same way, the formula for converting addresses in other formats into MP3 addresses can be obtained:

MP3 address = (this other format · MP3 frame length) / (MP3 frame time · this other format frame rate · this other format frame length).

Embodiment Three

Present embodiment introduces the method that merges a plurality of MP3 files and generates the MP3 file of a band address table, and its steps are as follows:

Merge the file tags of the original MP3 files to generate new file tags.

Merge the voice data of multiple MP3 files, and segment the voice data of each MP3 file separately. According to the original MP3 file to which each segment belongs, the segment serial number of this segment of voice data in the MP3 file to which it belongs, and after merging address in the voice data, and generate the corresponding MP3 address table. The index of the address table is divided into two layers: its high-level indicates the MP3 file to which this segment of voice data belongs, and its low-level indicates the segmentation of this segment of voice data in the MP3 file to which it belongs The sequence number; and the address corresponding to each index indicates the address of the segment in the merged voice data.

Combine the address table, the merged voice data and the merged file label to generate an MP3 file with an address table. The address table of the new MP3 file contains two layers of indexes, so it can be used by playback tools to accurately locate any MP3 file. Play any segment. The address table data structure of the new MP3 file is as follows:

0x00-0x04 0x050-0x09 ... 0xF5-0xF9 0xFA-0xFE ... Track1 index1 Track1index2 Track2index1 Track2index2

Among them, Track represents the high-level index, and Index represents the low-level index. The content of the address 0x00-0x04 is:

The following is a storage example of the generated MP3 file:

Track and Index number play content The corresponding MP3 address Track1 Index1 Where are we going? 0x000000 Track1 Index2 We're going to themuseum. 0x000010 Track1 Index3 Can I play at themuseum? 0x000023 Track1 Index4 No, you mustn't play there. 0x000035

Track2 Index1 We're going to learn lots of things. 0x00004B Track2 Index2 We must look andhsten carefully 0x000062 Track2 Index3 Then we're going togo to the hospital 0x000077 Track2 Index4 Why? 0x00008E Track2 Index5 Because Grandma isthere. She has a fever 0x000098 Track2 Index6 Can we talk to Grandma? 0x0000AF

For users, Track1 Index1 represents the first sentence of the first article (or the first sentence of the first song), Track1 Index2 represents the second sentence of the first article, and Track2Index3 represents the third sentence of the second article. sentences, and so on.

Relatively speaking, if the voice data in a single MP3 file is segmented, because it does not need to indicate the MP3 file to which each segment of voice data belongs, it only needs to indicate the segment number of each segment of voice data in this MP3 file, so the address table Only one layer of index is required.

Claims (6)

1.MP3 the generation method of file, its step comprises:

1) speech data in the mp3 file is carried out segmentation;

2) generate corresponding MP3 address table according to the address of each segmentation in speech data;

3) address table, speech data and file label combination are generated the mp3 file of being with address table.

2. the generation method of claim 1 is characterized in that, if with other form beyond the MP3 speech data is carried out segmentation, then step 2 in step 1)) be:

2.1) according to MP3 frame length, the every frame time of MP3, this other format frame speed and this other format frame length the address of each segmentation is converted into the MP3 address;

2.2) generate corresponding MP3 address table according to the MP3 address that converses.

3. claim 1 or 2 generation method is characterized in that its step comprises:

1) merges the speech data of a plurality of mp3 files, the speech data of each mp3 file is carried out segmentation separately;

2) generate corresponding MP3 address table according to the former mp3 file under each segmentation, this section speech data fragment sequence number and the address in the speech data after merging thereof in affiliated mp3 file, the index of address table is divided into two-layer: the mp3 file under its high-rise this section of expression speech data, and its low layer is represented the fragment sequence number of this section speech data in affiliated mp3 file; The address in the speech data of this segmentation after merging is then represented in the pairing address of each index;

3) speech data after combination of address table, the merging and the file label after the merging generate the mp3 file of band address table.

4. the player method of the mp3 file that the generation method by the described mp3 file of claim 1 is generated, its step comprises:

A) receive the play command that requires to play assigned address;

B) in the address table of mp3 file, find out and specified position corresponding address;

C) begin to play the MP3 speech data from this address.

5. the player method of claim 4 is characterized in that, steps A) be: the order that has assigned address from code reader, received.

6. the player method of claim 4 is characterized in that, steps A) be: the order that has assigned address from touch-screen, received.

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