CN103219009A - Audio data processing device and method thereof - Google Patents

Abstract

The invention discloses an audio data processing device and a method thereof, wherein the audio data processing device comprises a processing unit and an audio decoder. The processing unit receives an 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 analyzes the audio data stream to separate the first file header and the audio data, obtains at least one file information according to the first file header, and generates a second file header according to the at least one file information, wherein the second file header conforms to an international video and audio 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 according to the second file header.

Description

Audio data processing device and method thereof

technical field

The present invention relates to a data processing device and its method, and in particular to an audio data processing device and its method.

Background technique

With the development of science and technology, people's requirements for the quality of multimedia are gradually increasing. Digital Audio Broadcasting (DAB) is therefore a digital version of the technical standard for sound broadcasting systems. Compared with traditional analog broadcast transmission methods such as analog FM broadcast, digital audio 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, there have been improved versions of new standards such as DAB+ (Digital Audio Broadcasting plus), which have solved some of the problems in previous standards and have been gradually adopted by various countries.

In the DAB+ standard, the High Efficiency Advanced Audio Coding (HE-AAC) encoding method is used to encode and compress the audio data content, which can improve the sound quality of the receiving quality broadcast audio data content. In fact, audio decoders with advanced audio coding (Advanced Audio Coding, AAC) decoding capabilities generally have the ability to decode HE-AAC when sufficient data parameters are obtained, such as general digital TV chips or digital audio Audio codec included in the player. However, in the DAB+ standard, the audio data encoded by HE-AAC is transmitted in the form of Audio Super Frame (ASF), and the data parameters required for decoding are stored in the header of the audio super frame. As a result, even an audio decoder with AAC decoding capability cannot directly decode and play audio data.

Contents of the invention

The present invention provides an audio data processing device and its method, so that an audio decoder can obtain file information needed for decoding from an unidentifiable file header for decoding.

The invention provides an audio data processing device, which includes 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 a International audio and 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 an audio data processing method, which includes 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. Next, a second file header is generated according to at least one file information, wherein the second file header conforms to an international audio-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 device and method thereof, which can obtain data information required for decoding from a file header conforming to a communication protocol, and then make these file information into a format recognizable by an audio decoder. The audio decoder can decode and play according to these file information.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

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

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

Wherein, the reference signs are explained as follows:

10: Audio data processing device

110: processing unit

120: audio codec

AS: audio data stream

FH2: File header

AD: audio data

DAS: Decompressed Audio Data

S101～S104: steps

Detailed ways

FIG. 1 is a device block diagram of an audio data processing device according to an embodiment of the present invention. Referring to FIG. 1 , the audio data processing device 10 includes a processing unit 110 and an audio decoder 120 . The processing unit 110 receives an audio data stream AS. In this embodiment, the audio data stream AS conforms to the format of the DAB+ standard, including headers 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 worth mentioning that this is only a detailed description of the content of the present invention, but the present invention is not limited to the above-mentioned communication protocol and encoding format.

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

The second file header FH2 is a file header conforming to the international audio-visual coding standard, for example, corresponding to the audio data AD encoded in the HE-AAC mode, and the second file header FH2 conforms to the second edition of the standard of the Motion Picture Experts Group ( Moving Picture Experts Group-2, MPEG-2) or the fourth edition of the Moving Picture Experts Group standard (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 audio-video coding standard. For example, the transmission data and storage data required for decoding are stored in the second file header FH2 in the format of Audio DataTransport Stream (ADTS) and Audio Data Interchange Format (ADIF) respectively. .

It is worth mentioning that since the HE-AAC format is defined in the MPEG-4 standard, although the second file header FH2 is made into a format conforming to the MPEG-2 standard by the processing unit 110, the back-end AAC decoding capability can also be used. The audio decoder (such as the audio decoder 120 ) successfully decodes, but in this embodiment, using the processing unit 110 to make the second file header FH2 into a format conforming to the MPEG-4 standard is a preferred implementation. However, the present invention is not limited to the above-mentioned embodiments, and the point is to provide a file header format that can be recognized by the backend (such as the audio decoder 120 ).

Please continue to refer 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 decompressed audio data DAS, and further decompress the audio data DAS for playback.

In this embodiment, the audio decoder 120 is capable of decoding audio data encoded in the AAC format. Wherein, since the HE-AAC encoding format has downward compatibility, the audio decoder 120 capable of decoding audio data in the AAC format can also decode audio data (such as audio data AD) encoded in the HE-AAC format. Since the audio decoder 120 has the ability to decode the audio data in the AAC format, it also has the ability to recognize the format conforming to the MPEG-2 standard or the MPEG-4 standard. Therefore, when decoding the audio data AD, the audio decoder 120 can obtain information required for decoding from the second file header FH2, such as the transmission data stored in the ADTS format and the storage data stored in the ADIF format, and according to these information The audio data AD is decoded to obtain the decompressed audio data DAS, and then played.

FIG. 2 is a flow chart of steps of an audio data processing method according to an embodiment of the present invention. Please refer 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 at least one file information, wherein the second file header complies with an international audio-video coding standard. Furthermore, in step S104, the audio data stream is decompressed according to the second file header. For detailed implementation of the method, reference may be made to the description of the embodiment in FIG. 1 above, and details are not repeated here.

To sum up, the present invention provides an audio data processing device and method thereof. When the audio decoder has the ability to decode audio data encoding formats (such as AAC format or HE-AAC format), the processing unit can be ahead of the unrecognizable For example, the information required for encoding is obtained from the header of the audio data stream in the ASF format in the DAB+ standard, and converted into a format recognizable by the audio decoder, such as the header format conforming to the MPEG-2 or MPEG-4 standard, Let the audio decoder obtain the information required for encoding through the recognizable header format, and then decode smoothly.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

Claims (12)

1. An audio data processing device, comprising: A processing unit 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, and the processing unit parses the audio data stream to separate The first file header and the audio data, at least one file information is generated according to the first file header, and a second file header is obtained according to the at least one file information, wherein the second file header conforms to an international audio-visual 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. 2. The audio data processing device as claimed in claim 1, wherein the communication protocol is DAB or ADV. 3. The audio data processing device as claimed in claim 1, wherein the communication protocol is Advanced Digital Broadcasting, and the audio compression format is High Performance Advanced Audio Coding. 4. The audio data processing apparatus as claimed in claim 2, wherein the first file header is in a file header format conforming to audio superframe in DABB or DABB-Advanced protocol. 5. audio data processing apparatus as claimed in claim 2, wherein: This international audiovisual coding standard is the fourth edition of the Moving Picture Experts Group standard; and The at least one file information includes transmission data conforming to the format of the audio data transport stream header and storage data conforming to the audio data exchange format. 6. audio data processing apparatus as claimed in claim 5, wherein: The second file header conforms to the header format of the Advanced Audio Coding audio compression format. 7. A method for processing audio data, comprising: 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; parsing the audio data stream to separate the first file header and the audio data, and obtain 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 complies with an international audio-video coding standard; The audio data is decompressed according to the second file header. 8. The audio data processing method according to claim 7, wherein, in the method, the communication protocol is DAB or ADV. 9. The audio data processing method as claimed in claim 7, wherein the communication protocol is Advanced Digital Broadcasting, and the audio compression format is High Performance Advanced Audio Coding. 10. The audio data processing method as claimed in claim 9, wherein the first file header is in a file header format conforming to audio superframe in DABB or DABB-Advanced protocol. 11. audio data processing method as claimed in claim 8, wherein: This international audiovisual coding standard is the fourth edition of the Moving Picture Experts Group standard; and The at least one file information includes transmission data conforming to the format of the audio data transport stream header and storage data conforming to the audio data exchange format. 12. audio data processing method as claimed in claim 11, wherein: The second file header conforms to the header format of the Advanced Audio Coding audio compression format.

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