TW201331931A - Apparatus for audio data processing and method therefor - Google Patents

Abstract

An apparatus for audio data processing and method therefor are provided, wherein the apparatus includes a processing unit and an audio decoder. The processing unit receives an audio data stream, wherein the audio data steam includes a first file header that fits a communication protocol and an audio data encoded with a audio compression format. The processing unit parses the audio data stream to split the first file header and the audio data, derives at least one file information according to the first header, and generates a second file header according to at least one file information wherein the second file header fits in an international audio and video coding format. The audio decoder is coupled to the processing unit, receives the second file header and the audio data, and decompresses the audio data according to the second file header.

Description

Audio data processing device and method thereof

The present invention relates to a data processing apparatus and method thereof, and more particularly to an audio data processing apparatus and method thereof.

With the development of technology, people's quality requirements for multimedia have gradually increased. Digital Audio Broadcasting (DAB) is the result of digital technology standards for sound broadcasting systems. Compared with the traditional analog broadcast transmission method, such as analog FM broadcast, the digital sound broadcast has the advantages of high sound fidelity, strong noise and interference resistance, and can accommodate more broadcast channels in a single frequency band. In recent years, new and improved standards such as DAB+ (Digital Audio Broadcasting plus) have solved some of the problems in the previous standards and are gradually adopted by countries.

Among the DAB+ standards, the high-efficiency Advanced Audio Coding (HE-AAC) encoding method is used to encode the compressed audio data content, and the sound quality of the receiving quality broadcast audio data content can be improved. In fact, an audio decoder that generally has Advanced Audio Coding (AAC) decoding capability has the ability to decode HE-AAC when sufficient data parameters are obtained, such as a general digital television chip or digital audio. Dial the audio decoder included in the player. However, in the DAB+ standard, the audio data encoded by HE-AAC is transmitted in the form of an audio super frame (ASF), and the data parameters required for decoding are stored in the header of the audio super frame. . In this way, even an audio decoder with AAC decoding capability cannot directly decode audio data and play it.

The present invention provides an audio data processing apparatus and method thereof, which enable an audio decoder to obtain file information required for decoding from an unrecognizable header for decoding.

The invention provides an audio data processing device, comprising a processing unit and an audio decoder. The processing unit receives the audio data stream, wherein the audio data stream includes a first file header conforming to a communication protocol, and audio data encoded in an audio compression format. The processing unit parses the audio data stream to separate the first file header and the audio data, generates at least one file information according to the first file header, and obtains a second file header according to the at least one file information, wherein the second file header conforms to one International video coding standard. The audio decoder is coupled to the processing unit, receives the second file header and the audio data from the processing unit, and decompresses the audio data stream according to the second file header.

The invention provides a method for processing audio data, comprising the following steps. First, an audio data stream is received, wherein the audio data stream includes a first file header conforming to a communication protocol, and audio data encoded in an audio compression format. Then, the audio data stream is parsed to separate the first file header and the audio data, and at least one file information is obtained according to the first file header. Then, a second file header is generated according to the at least one file information, wherein the second file header conforms to an international video coding standard. Furthermore, the audio data stream is decompressed according to the second file header.

Based on the above, the present invention provides an audio data processing apparatus and method thereof, which can retrieve data information required for decoding from an archive file header conforming to a communication protocol, and then make the file information into a format recognizable by the audio decoder. The audio decoder can decode and play according to the file information.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1 is a block diagram of an apparatus for processing an audio data according to an embodiment of the invention. Referring to FIG. 1 , the audio data processing apparatus 10 includes a processing unit 110 and an audio decoder 120. The processing unit 110 receives the audio data stream AS. In this embodiment, the audio data stream AS conforms to the DAB+ standard format, and includes the header and audio data content encapsulated in the ASF format, wherein the audio data content is encoded and compressed in the HE-AAC format. It is to be noted that the contents of the present invention are only described in detail herein, but the present invention is not limited to the above-described communication protocols and encoding formats.

The processing unit 110 parses the audio data stream AS to separate the first file header and the audio material AD. The processing unit 110 generates at least one file information according to the first file header, wherein at least one file information includes file information that is indispensable for decoding audio data in the HE-AAC format, such as parameters for storing audio data and transmitting audio data. . The processing unit 110 obtains the second file header FH2 according to the at least one file information.

The second file header FH2 is an archive header conforming to the international video coding standard, for example, corresponding to the audio data AD encoded by HE-AAC, and the second file header FH2 conforms to the second edition of the Motion Picture Experts Group ( Moving Picture Experts Group-2, MPEG-2) or Moving Picture Experts Group-4 (MPEG-4). The data required for decoding is stored in the second file header FH2 in a manner corresponding to the above-mentioned international video coding standard. For example, the transmission data and the stored data required for decoding are stored in the second file header FH2 in the format of an Audio Data Transport Stream (ADTS) and an Audio Data Interchange Format (ADIF). Among them.

It is worth mentioning that since the HE-AAC format is defined in the MPEG-4 standard, although the second file header FH2 is formatted by the processing unit 110 to conform to the MPEG-2 standard format, the backend can also be utilized for AAC decoding. The audio decoder of the capability (for example, the audio decoder 120) successfully decodes, but in the embodiment, it is still a better implementation to use the processing unit 110 to make the second file header FH2 into a format conforming to the MPEG-4 standard. the way. However, the present invention is not limited to the above-described embodiments, and it is important to provide an archive header format that can be recognized by the backend (e.g., audio decoder 120).

Referring to FIG. 1 , the audio decoder 120 is coupled to the processing unit 110, receives the second file header FH2 and the audio data AD from the processing unit 110, and then decompresses the audio data AS according to the second file header FH2 to obtain the decompressed information. The audio data is DAS, and the audio data DAS is further decompressed for playback.

In the present embodiment, the audio decoder 120 has the ability to decode audio material encoded in the AAC format. The audio decoder 120 having the audio data for decoding the AAC format can also decode the audio data (for example, the audio material AD) encoded by the HE-AAC format, because the HE-AAC encoding format has the capability of backward compatibility. Since the audio decoder 120 has the ability to decode AAC format audio data, it also has the ability to recognize formats conforming to the MPEG-2 standard or the MPEG-4 standard. Therefore, when decoding the audio material AD, the audio decoder 120 can retrieve the information required for decoding from the second file header FH2, such as the transmission data stored in the ADTS format and the stored data stored in the ADIF format, and according to these The information decoding audio data AD obtains the decompressed audio data DAS, and then plays.

2 is a flow chart showing the steps of a method for processing an audio data according to an embodiment of the invention. Referring to FIG. 2, first in step S101, an audio data stream is received, wherein the audio data stream includes a first file header conforming to a communication protocol, and audio data encoded in an audio compression format. Then, in step S102, the audio data stream is parsed to separate the first file header and the audio data, and at least one file information is obtained according to the first file header. Next, in step S103, a second file header is generated according to the at least one file information, wherein the second file header conforms to an international video coding standard. In addition, in step S104, the audio data stream is decompressed according to the second file header. For a detailed implementation of the method, reference may be made to the description of the embodiment of FIG. 1 above, and details are not described herein.

In summary, the present invention provides an audio data processing apparatus and method thereof. When an audio decoder has a decoding capability of an audio data encoding format (for example, AAC format or HE-AAC format), the processing unit can be first illegible through the processing unit. The format, such as the information required for encoding in the ASF format audio stream in the DAB+ standard, is converted to an identifiable format of the audio decoder, such as a header format conforming to the MPEG-2 or MPEG-4 standard. Let the audio decoder capture the information needed for encoding through the identifiable header format, and then smoothly decode it.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10. . . Audio data processing device

110. . . Processing unit

120. . . Audio decoder

AS. . . Audio data stream

FH2. . . File header

AD. . . Audio data

DAS. . . Decompressed audio material

S101～S104. . . step

FIG. 1 is a block diagram of an apparatus for processing an audio data according to an embodiment of the invention.

2 is a flow chart showing the steps of a method for processing an audio data according to an embodiment of the invention.

10. . . Audio data processing device

110. . . Processing unit

120. . . Audio decoder

AS. . . Audio data stream

FH2. . . File header

AD. . . Audio data

DAS. . . Decompressed audio material

Claims (12)

An audio data processing apparatus includes: a processing unit that receives an audio data stream, wherein the audio data stream includes a first file header conforming to a communication protocol, and an audio data encoded in an audio compression format, the processing The unit parses the audio data stream to separate the first file header and the audio data, generates at least one file information according to the first file header, and obtains a second file header according to the at least one file information, wherein the second file header The file header conforms to an international video coding standard; and an audio decoder coupled to the processing unit, receives the second file header and the audio data from the processing unit, and decompresses the audio data according to the second file header . The audio data processing device according to claim 1, wherein the communication protocol is Digital Audio Broadcasting (DAB) or Digital Audio Broadcasting Plus (DAB+). The audio data processing device of claim 1, wherein the communication protocol is Advanced Audio Broadcasting (DAB), and the audio compression format is High Efficiency Advanced Audio Coding. , HE-AAC). The audio data processing device of claim 2, wherein the first file header is an audio header conforming to an audio super frame (ASF) in a digital sound broadcast or an advanced digital sound broadcasting protocol. format. The audio data processing device of claim 2, wherein: the international video coding standard is Moving Picture Experts Group-4 (MPEG 4); and at least one file information includes an audio-compliant information. One of the data formats of the Audio Data Transport Stream (ADTS) header format transmits data and a stored data conforming to the Audio Data Interchange Format (ADIF). The audio data processing device of claim 5, wherein the second file header conforms to a header format of an Advanced Audio Coding (AAC) audio compression format. An audio data processing method includes: receiving an audio data stream, wherein the audio data stream includes a first file header conforming to a communication protocol, and an audio data encoded in an audio compression format; and parsing the audio data stream to Separating the first file header and the audio data, and obtaining at least one file information according to the first file header; generating a second file header according to at least one file information, wherein the second file header conforms to an international video Encoding standard; decompressing the audio data according to the second file header. The method of processing audio data according to claim 7, wherein the communication protocol is Digital Audio Broadcasting (DAB) or Digital Audio Broadcasting Plus (DAB+). The method for processing audio data according to claim 7, wherein the communication protocol is Advanced Audio Broadcasting (DAB), and the audio compression format is High Efficiency Advanced Audio Coding (High Efficiency Advanced Audio Coding, HE-AAC). The method for processing audio data according to claim 9, wherein the first file header is an audio header of an audio super frame (ASF) in accordance with a digital sound broadcast or an advanced digital sound broadcasting protocol. format. The method for processing audio data according to claim 8 is characterized in that: the international video coding standard is Moving Picture Experts Group-4 (MPEG 4); and at least one file information includes audio information. One of the data formats of the Audio Data Transport Stream (ADTS) header format transmits data and a stored data conforming to the Audio Data Interchange Format (ADIF). The method for processing audio data according to claim 11, wherein the second file header conforms to a header format of an Advanced Audio Coding (AAC) audio compression format.