KR20070077945A - Recording method of selective broadcasting in digital multimedia broadcasting terminal and the terminal thereof - Google Patents

Abstract

A method for selectively recording broadcasting and a terminal for performing the method are provided to record broadcasting including audio tracks which a user desires, thereby efficiently utilizing a storage space. If a request for recording is inputted, constitution information about a broadcasting service currently reproduced is checked. It is determined whether one or more audio tracks are included in the broadcasting service, based on the constitution information(315). If the audio tracks are included in the broadcasting service, a screen for selecting an audio track is displayed(325). If one audio track is selected through the screen, broadcasting including audio data of the selected audio track is recorded(340).

Description

RECORDING METHOD OF SELECTIVE BROADCASTING IN DIGITAL MULTIMEDIA BROADCASTING TERMINAL AND THE TERMINAL THEREOF}

1 is an internal block diagram of a DMB terminal performing a recording function;

2 is an internal block diagram of a DMB terminal in which a selective broadcast recording function is implemented according to an embodiment of the present invention;

3 is a control flowchart for performing selective broadcast recording according to an embodiment of the present invention;

4 is an exemplary audio track selection screen configured according to an embodiment of the present invention.

5 is a diagram illustrating audio and video track information and a chunk structure according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital multimedia broadcasting terminal, and more particularly, to a selective broadcast recording method and a terminal in a digital multimedia broadcasting terminal for selecting a desired audio track.

In general, digital broadcasting refers to a broadcasting service that provides a user with high quality, high sound quality, and higher service in place of a conventional analog broadcasting. Recently, with the development of digital broadcasting technology and mobile communication technology, interest in digital broadcasting service for allowing digital broadcasting to be watched on the go has increased. In particular, there is a growing interest in digital multimedia broadcasting (DMB) services using mobile communication terminals.

In accordance with this trend, the broadcasting environment is not only evolving to support multimedia and multi-channel but also to generate and distribute a large amount of high quality multimedia contents. In particular, new media such as satellite and DMB are appearing as existing terrestrial waves, cables, etc.In broadcasting and telecommunication convergence environments, users can use TVs, PCs, mobile phones, personal digital assistants (PDAs), and digital multimedia broadcasts (DMBs). Various types of multimedia contents can be accessed using various kinds of devices such as terminals.

Such a terminal capable of digital multimedia broadcasting provides a recording function for recording a broadcast while watching a broadcast. Accordingly, the user can store desired broadcast data as necessary using the terminal. At this time, the method of recording a broadcast in order to store the digital broadcast data desired by the user is almost the same as the recording method in the broadcast using the analog signal in the past. For example, there is a method of storing digital broadcast data by setting a reservation recording in advance, or storing digital broadcast data by a user directly controlling a storage device. That is, from the initial video cassette recorder (VCR), the broadcast recording function can be performed by storing broadcast data in various forms using various digital storage media such as a hard disk drive (HDD) and a flash memory (Flash memory). It became.

In this situation, MPEG-2 is made suitable for digital broadcasting, adopted by various digital broadcasting standards, and MPEG-4 is used as a high efficiency multimedia codec.

1 is an internal block diagram of a DMB terminal performing a recording function. Referring to FIG. 1, the received broadcast data is demultiplexed into a video data packet and an information data packet by a TS (Transport Stream) demultiplexer. In this case, the information data packet is transferred to the PSI analyzer, and the video data packet BIFS (Binary Format for Scene), video and audio data are stored in respective buffers. In the DMB terminal having the above-described structure, any one of a plurality of audio buffers is selected by the playback audio selecting unit 20 under the control of the controller 10. The audio data of the corresponding buffer selected through the playback audio selector 20 is decoded by the audio decoder, the video data of the remaining video buffer is decoded by the video decoder, and the BIFS of the BIFS buffer is analyzed by the BIFS analyzer. . Since MPEG-4 is an object-based expression system, the DMB terminal outputs video and audio through a video output unit by referring to BIFS, which is information for configuring a screen.

When recording a MPEG-4 content using the MPEG-2 transmission system while a broadcast is being played through the above process, since the playback audio selector 20 is connected to the audio buffer currently being played, the recording module 30 Will only record one audio and video data that is currently playing.

As described above, in the case of recording multiple audio tracks in which MPEG-4 content includes languages of several countries in one service, only audio and video currently being played are recorded. You lose it. That is, in the case of a multi-audio track, the remaining audio data that is not played is discarded. In contrast, recording entire audio tracks saves unnecessary audio track data, which wastes storage space on small devices with limited capacities such as mobile phones and portable multimedia players (PMPs).

Accordingly, the present invention provides a method of selectively recording a broadcast in a digital multimedia broadcasting terminal and a terminal for selecting a desired audio track.

In accordance with another aspect of the present invention, there is provided a method of selectively recording a broadcast in a digital multimedia broadcasting terminal, the method comprising: determining configuration information on the broadcast service being played when a recording request is input; Determining whether at least one audio track is included in the service; displaying a screen for selecting an audio track when the determination includes at least one audio track; and displaying one audio on the screen. And if a track is selected, recording a broadcast including audio data of the selected audio track.

In addition, according to the present invention, a digital multimedia broadcasting terminal capable of selectively broadcasting recording includes: a PSI analyzing unit for identifying configuration information of the broadcasting service being played; a video buffer storing video data in the form of Packetized Elementary Stream (PES); At least one audio buffer for storing audio data in the form of Packetized Elementary Stream (PES), a recording audio selector connected to any one of the audio buffers, and at least one of the at least one in the broadcast service based on the configuration information. A control unit which controls to display a screen for selecting an audio track when it is determined that at least one audio track is included, and controls the recording audio selection unit to be connected to a corresponding audio buffer when one audio track is selected on the screen;

And a recording module for receiving buffer information and audio data of the selected audio track from the recording audio selection unit and storing the recording information as a recording file.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In the following description and the annexed drawings, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

The present invention implements a broadcast recording function that enables the selection of a desired audio track. To this end, the present invention determines whether at least one audio track is included in a broadcast to be recorded using PSI (Program Specification Information) information during recording, and if the result is a multi-audio track, displays it on the screen to the user. Allows you to select the desired audio track. As such, since the user can directly record a broadcast including the desired audio track, the user can not only utilize the storage space more efficiently, but also provide a recording function suitable for various purposes of the user.

Hereinafter, an internal block diagram of a digital multimedia broadcasting (DMB) terminal in which the above functions are implemented will be described with reference to FIG. 2. 2 is an internal block diagram of a DMB terminal in which a selective broadcast recording function is implemented according to an embodiment of the present invention.

Referring to FIG. 2, when broadcast data is input, the TS demultiplexer 102 demultiplexes broadcast data in a transport packet format into a video data packet and an information data packet. Accordingly, the transport stream generated from the MPEG-2 multiplexer is separated into sub-streams such as Packetized Elementary Stream (PES), Section (SECTION), etc. for each PID (Packet IDentifier) through the TS demultiplexer 102. do.

Accordingly, the information data packet is provided to the PSI analyzer 103, and in the case of audio and video among the video data packets contained in each TS separated from the TS demultiplexer 102, a packetized elementary stream (PES) form is provided. Are stored in respective buffers 107 to 111. At this time, if BIFS exists in the video data packet, the BIFS is stored in the BIFS buffer 107.

The information data packet transmitted to the PSI analyzer 103 is PSI, which is data necessary for demultiplexing TS and reproducing a program in MPEG-2, and the PSI analyzer 103 is an MPEG-2 PMT (Program Map Table) in the PSI. ) To identify the configuration information of the broadcast service. In other words, this analysis can be used to determine which streams a program is composed of and what information each stream contains.

When such service configuration information is transmitted to the control unit 105, the control unit 105 outputs broadcast service information for allowing a user to select an audio track to be recorded during recording. If the broadcast is to be played back, the controller 105 controls the playback audio selector 115 to select one of the plurality of audio buffers 109 to 111 so that the audio data in the buffer is the audio decoder 114. To be delivered). In this case, video data in the video buffer 109 is also transmitted to the video decoder 113, and BIFS in the BIFS buffer 107 is also transmitted to the BIFS analyzer 110.

The video decoder 113 may decode the video stream in the broadcast service, for example, may be in the form of an H.264 decoder, and the audio decoder 114 may also decode the audio stream in the broadcast service. For example, it may be in the form of a BSAC decoder.

Meanwhile, the BIFS analyzer 110 analyzes BIFS and transmits screen configuration information to the video output unit 117, which may be transmitted to the controller 105. Here, BIFS refers to MPEG-4 scene description. In addition to audio / video streams, DMB provides MPEG-4 BIFS as ancillary data. BIFS organizes screens in units of objects and combines them to form a scene. Since scene description information is required to compose each screen, that is, composition, the audio and video data are configured according to the scene description information BIFS and output through the video output unit 117 to be provided to the user. It becomes possible. The video output unit 117 outputs a scene configured in a detection position module (not shown) to a screen, and audio data to a speaker. In other words. The video output unit 117 combines and outputs video data and audio data according to BIFS.

Meanwhile, according to an exemplary embodiment of the present invention, if there is an audio track selection through the user interface 104 at the time of recording, the control unit 105 controls the recording audio selection unit 116 according to the selection, thereby providing a plurality of audio buffers 109 to 111. Select an audio buffer so that audio data in the buffer can be delivered to the recording module 118.

In the case of multiple audio tracks, the recording audio selector 116 provides the recording module 118 with buffer information and data for the audio track selected by the user. Accordingly, the recording module 118 may take audio data from the corresponding audio buffer through the recording audio selector 116 and store the audio data as one file together with the video data from the video buffer. In detail, the recording module 118 stores the audio and video data input at the time of recording in each chunk buffer, and when the chunk buffer is full, the recording module 118 stores the data of the chunk buffer in the recording file, and the file header (Metadata buffer). It is responsible for updating the contents of. Accordingly, the recording module 118 generates a recording file that stores audio and video data and a header indicating track configuration information of each data.

Looking at the broadcast recording process in the DMB terminal as described above are as follows.

First, upon receiving the RF signal transmitted from the DMB transmitter, the carrier is removed from the received RF signal and demodulated to form a transport packet. In other words, the received broadcast data is made in the form of MPEG-2 TS through a lower layer decoding process in the DMB terminal. Thereafter, a list of broadcast programs can be obtained by analyzing a PAT (Program Association Table) transmitted to PID "0". Accordingly, a user can select a specific program. If a specific program is selected by the user, the DMB terminal may obtain configuration information of the program by analyzing a program map table (PMT) of the corresponding program. On the other hand, the stream constituting the program is divided into an information data packet and a video data packet via the MPEG-2 TS demultiplexer 102, and the data contained in the TS enters the respective buffers in the form of PES, SECTION, and the like. do.

Thereafter, the DMB terminal decodes audio / video / graphic data necessary for program reproduction based on the PSI information and the BIFS information, and finally outputs it to a screen or a speaker through a composition process so as to be appropriately disposed on the screen. At this time, when the BIFS is not included in the video data packet, the DMB terminal selects one video and one audio and performs playback only with PSI information.

If recording starts, the DMB terminal determines whether only one audio track exists or whether there are multiple audio tracks. If only one audio track exists, the DMB terminal stores audio data and video data corresponding to the audio track currently being played and performs recording.

In contrast, in the case of a multi-audio track having a large number of audio tracks, the audio data recorded in the DMB terminal may be different from the currently reproduced audio data because the audio data recorded in the DMB terminal may vary according to a user's selection. At this time, in the embodiment of the present invention, the encoded frames in the buffers 108 to 111 do not need to be separately encoded for both audio and video.

A process of performing broadcast recording for selecting a desired audio track as described above will be described in detail with reference to FIG. 3. 3 is a control flowchart for performing selective broadcast recording according to an embodiment of the present invention.

Referring to FIG. 3, if the user selects recording in step 300, the terminal determines whether broadcast is being played in step 305. As a result of the check, when the broadcast is being played and the recording is possible, the DMB terminal analyzes the PSI in step 310. In detail, the DMB terminal collects descriptor information included in an elementary stream (ES) loop and creates an audio track selection screen to be recorded to a user in the case of audio data, that is, an audio stream. The audio track selection screen may be displayed as shown in FIG. 4, and since the language information corresponding to each audio track is also stored in the PMT, the audio track selection screen may be displayed on the screen together with detailed information such as audio track language information extracted from ISO_639_language_descriptor. It can be displayed. 4 is an exemplary audio track selection screen configured according to an embodiment of the present invention.

Based on the PSI analysis result in step 310, the DMB terminal determines whether it is a multi-audio track in step 315. If there is only one audio track, the DMB terminal records the audio track being played back in step 335 without having to show the audio track selection screen. That is, recording starts by storing audio data and video data corresponding to the audio track being played.

In contrast, when the audio track is at least one multi-audio track, the DMB terminal displays information on each audio track through the audio track selection screen in step 325. In operation 330, the DMB terminal determines whether one audio track is selected. If any one audio track is selected, the DMB terminal performs recording on the selected audio track in step 340. That is, audio data corresponding to the selected audio track and video data of the video track are stored. When the recording is ended by the user through the above process, the corresponding audio data and video data are made into one file. This process is described in more detail as follows.

When an audio track to be recorded is selected among the multi audio tracks, the selected audio track information is transferred to the recording audio selector 116 to manage a buffer in which the recording module 118 reads audio frame data necessary for recording. At this time, each audio and video buffer (108 ~ 111) is composed of a packetized elementary stream (PES), the audio frame / video frame data is contained in the PES.

Accordingly, the recording module 118 reads frame data from the video buffer 108 and the selected audio buffer and stores the data in the chunk buffer. When the limit capacity of the buffer is reached, the recording module 118 stores the data of the chunk buffer in the file. At this time, a header, that is, a metadata buffer, containing audio and video track information and chunk structure information is updated. For example, referring to FIG. 5 illustrating audio and video track information and a chunk structure according to an embodiment of the present invention, if audio track 3 is selected by a user, the recording module 118 is controlled by the controller 105. ) Can determine which position to read the video data and the audio data from the video chunk and the audio chunk at the position using the video track 1 information and the audio track 3 information of the header buffer. Here, the audio chunk may be viewed as a collection of audio frames having a predetermined size. In FIG. 5, reference numerals 500 and 520 denote access points for storing video data, and reference numerals 510 and 530 denote access points for storing audio data corresponding to audio track 3. Since one video and audio track corresponds to one chunk, multiple chunk buffers are required to record a multi-audio track.

If the user issues a recording stop command, the header information including the frame data remaining in the chunk buffer is stored in the file. Accordingly, the structure of the recorded file is the same as the MP4 file format of FIG. 5. Therefore, on the basis of such a recording file reproduction structure, the DMB terminal reads audio and video track structure information through header information when playing a recording file. If it contains multiple audio tracks, a screen is displayed for the user to select an audio track to be used for playback. When the user selects an audio track, the header information is used to determine the location of the chunk in which the audio data corresponding to the selected audio track is stored. Subsequently, the DMB terminal reads the corresponding data from the location. If the read data is audio data, the DMB terminal stores the data in the audio buffer and outputs the audio data to the speaker through the audio decoder.

As described above, the present invention provides an audio track selection screen in which information on a plurality of audio tracks is displayed when a broadcast service to be recorded using PSI information is included, thereby selecting a desired audio track. To record the broadcast.

According to the present invention as described above, as the transmission channel is speeded up and the transmission / reception terminal becomes high performance, various audio / video streams as well as high-definition / high-quality multimedia data are included in one program, and according to the performance / characteristics of the receiving terminal There is an advantage that the recorded recording is possible. In addition, the user can select and play any one of a plurality of received audio streams, as well as record an audio stream different from the audio being played. In addition, when recording broadcast data including multiple audio tracks, the user can selectively record an audio stream, thereby improving the recording efficiency of a small device with less storage space and using the recording function for various purposes. There is an advantage to this.

Claims (6)

In the selective broadcast recording method in a digital multimedia broadcasting terminal, Identifying a configuration information of the broadcast service being played when a recording request is input; Determining whether at least one audio track is included in the broadcast service based on the configuration information; If it is determined that at least one audio track is included, displaying a screen for selecting an audio track; Recording a broadcast including audio data of the selected audio track when one audio track is selected on the screen. The method of claim 1, And if it is determined that one audio track is included, recording a broadcast including audio data of the currently playing audio track. The screen for selecting an audio track of claim 1, wherein A plurality of selectable audio track information and language information corresponding to each audio track obtained from a program map table (PMT) are displayed. Digital multimedia broadcasting terminal capable of selective broadcast recording, A PSI analysis unit which grasps configuration information of the broadcast service being played; A video buffer for storing video data in the form of Packetized Elementary Stream (PES), At least one audio buffer for storing audio data in the form of Packetized Elementary Stream (PES), A recording audio selection unit connected to any one of the audio buffers; If it is determined that at least one audio track is included in the broadcast service based on the configuration information at the start of recording, control to display a screen for selecting an audio track, and if one audio track is selected on the screen, the corresponding audio buffer A controller for controlling the recording audio selection unit to be connected; And a recording module configured to receive buffer information and audio data of the selected audio track from the recording audio selection unit and to store the recording information as a recording file. The method of claim 4, wherein the recording module And the audio data provided from the recording audio selection unit and the video data from the video buffer are stored as one recording file. The method of claim 4, wherein the control unit And if one audio track is included in the broadcast service based on the configuration information, controlling to record a broadcast including audio data of an audio track currently being played.

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