KR100431548B1 - Apparatus for reproducing a moving picture using stream header information - Google Patents

Abstract

The present invention relates to a video file playback apparatus for real-time decoding a video file using stream header information or for playing a video file stored in an auxiliary memory device according to a user's request.

A network connection unit for receiving designated multicast data packets among the multicast data packets from a moving picture file provider and separately outputting stream header information and MPEG transport stream (TS) data from the received multicast data packets; A buffer memory for temporarily storing transport stream (TS) data between the network connection and the decoder; And a system controller extracting at least a video PID, an audio PID, and a PCR value from the stream header information output from the network connection unit and outputting the same to the decoder to control decoding of the transport stream data.

Description

A video file playback device using stream header information {APPARATUS FOR REPRODUCING A MOVING PICTURE USING STREAM HEADER INFORMATION}

The present invention relates to a digital receiver based on an MPEG decoder, and more particularly, to a video file reproducing apparatus for real-time decoding a video file using the received stream header information or reproducing a video file stored in an auxiliary memory device according to a user's request. It is about.

"Personal Video Recorder" introduced by Tivo, Teplay TV, etc. in the United States applies a hard disk to TVs and STBs for up to 30 hours. By designing to be able to record even up to the public, a technology that allows viewers to watch various programs with a predetermined time difference has been introduced. As a technology of using a hard disk as a recording / playback device such as a TV is introduced, various manufacturers are actively researching on this.

A receiver such as a TV with a built-in hard disk basically employs a data compression method to increase data storage efficiency, and generally includes an MPEG-2 decoder as a configuration for decoding compressed data. The MPEG-2 decoder-based receiver (eg, PVR, digital satellite receiver) basically includes components such as an MPEG-2 decoding module and a network protocol for the purpose of the device. Stream storage, real-time decoding, and search functions are provided to satisfy various needs of consumers. To implement such a function, certain information (PID, PCR value, picture information) is required for the received stream.

In the MPEG-2 decoder-based receivers as described above, MPEG-2 files are received through a network, and video specific packet identifiers (PSIs) are analyzed by analyzing program specific information (PSI) of the MPEG-2 files to decode them in real time. The process of extracting the PCR value from the PCR PID after acquiring the audio PID and the Program Clock Reference (PCR) PID must be repeated. This causes a lot of tasks such as PSI parsing and stream analysis in the system, which causes a problem of degrading system performance. This can put a greater burden on real-time decoding of MPEG files with higher bit rates, so given the trend of higher bit rates, decoding MPEG files in real time without degrading the performance of the system (or CPU). There is an urgent need for the development of an apparatus and method capable of acquiring the necessary information.

Accordingly, an object of the present invention is to provide an apparatus for reproducing a video file using stream header information which can obtain information on a stream to be decoded faster and decode the received video file.

It is still another object of the present invention to obtain information on a stream to be decoded faster and store it as an index file, so that the video file reproducing apparatus using stream header information which can be conveniently used to reproduce the stored video file in various ways. In providing.

1 is a block diagram of a video file player according to an embodiment of the present invention.

2 is a detailed format diagram of a multicast data packet received by a moving picture file reproducing apparatus according to an embodiment of the present invention.

3 is an exemplary view of index file information according to an embodiment of the present invention.

According to an embodiment of the present invention for achieving the above object, a video file playback apparatus;

A network connection unit for receiving designated multicast data packets among the multicast data packets from a moving picture file provider and separately outputting stream header information and MPEG transport stream (TS) data from the received multicast data packets;

A buffer memory for temporarily storing transport stream (TS) data between the network connection and the decoder;

And a system controller extracting at least a video PID, an audio PID, and a PCR value from the stream header information output from the network connection unit and outputting the same to the decoder to control decoding of the transport stream data.

The present invention further includes an auxiliary memory device for storing transport stream (TS) data output from the buffer memory; The index file that records the location information of the transport stream TS stored in the auxiliary memory device is generated by the system controller and stored together.

The multicast data packet includes an IP information field in which an IP address and a MAC address are recorded, a UDP information field in which source port information, destination port information, UDP length information, and checksum information are recorded, and the video PID, audio PID, and PCR. The header information field includes information of a stream header information field in which at least stream information including a value is recorded and an MPEG stream field in which MPEG transport stream data having a predetermined size is recorded, so that normal decoding can be performed without analyzing the stream. It can be read from and decodes video files.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

First, FIG. 1 is a block diagram of a video file playback apparatus according to an embodiment of the present invention. The video file playback apparatus according to the embodiment of the present invention is connected to the network connection unit 110 as shown in FIG. , A buffer memory 120, a system controller 130, a decoder 140, and a transport stream (TS) storage unit 150.

The network connection unit 110 receives the designated multicast data packets among the multicast data packets from the video file provider, and stream header information and the MPEG transport stream TS from the received multicast data packets. ) Separate the data. For reference, in order for the network connection unit 110 to receive data multicasted from the video file provider to the Ethernet network 100, the video file playback apparatus according to an embodiment of the present invention must first participate in the multicast group. In order to join a multicast group, it is obvious that a video file provider must know the multicast IP address and destination port information in advance.

Meanwhile, a buffer memory 120 is connected between the network connection unit 110 and the decoder 140, and the buffer memory 120 temporarily stores transport stream (TS) data separated from the network connection unit 110. Play a role.

The system controller 130 extracts at least a video PID, an audio PID, and a PCR value from the stream header information output from the network connection unit 110 and outputs the same to the decoder 140 to control decoding of the transport stream data. . In addition, the system controller 130 extracts picture information and offset information of the corresponding picture from the stream header information separately outputted from the network connection unit 110 to generate an index file that records the location information of the transport stream TS. The transport stream (TS) data stored according to a user's command is played back at high speed, at low speed, at fast reverse, at low speed, at a pause, and at 1x speed. In the description of the present invention, a user interface means for receiving a user command is not shown.

The TS storage unit 150 stores a transport stream (TS) data output from the buffer memory 120 as a hard disk drive as an auxiliary storage device. The TS storage unit 150 is access controlled by the system control unit 130.

Hereinafter, a format of a multicast data packet multicast from a video file provider will be described.

FIG. 2 illustrates a detailed format of a multicast data packet received by a moving picture file reproducing apparatus according to an embodiment of the present invention, and FIG. 3 illustrates an example of index file information according to an embodiment of the present invention.

Referring to FIG. 2, first, a multicast data packet according to an embodiment of the present invention includes an IP information field, a UDP information field, a stream header information field, and an MPEG stream field.

The IP address and the MAC address are recorded in the IP information field, and the source port information, destination port information, UDP length information, and checksum information are recorded in the UDP information field. The stream header information field includes a field in which tag information is recorded, a version information field for indicating version of header information, a payload type information field in which payload type information is recorded, A packet size information field in which packet size information is recorded and a stream information field in which stream information is recorded are included. In addition, bit rate information, video PID, audio PID, PCR value, picture type information, and picture offset information are recorded in the stream information field, which is used when decoding an MPEG stream that is a video file. The data is used for high speed reproduction, low speed reproduction, high speed reverse reproduction, low speed reverse reproduction, pause, and 1x speed reverse reproduction.

On the other hand, the index file generated by the system control unit 130, the picture information (I, B, B, P, ... B, B) extracted from the stream information field as shown in Figure 3 and the picture information The picture offset information may be added together with file offset information indicating an offset position from a start point of a moving image file and used to provide location information of the corresponding picture. Such an index file can be effectively used for fast playback, slow playback, fast reverse playback, and slow reverse playback of transport stream (TS) data stored on the hard disk surface.

Hereinafter, a method of reproducing real-time or stored TS data using the above-described configuration of a video file reproducing apparatus and a data packet format will be described.

First, when a video file provider transmits a desired data packet to a designated video file reproducing apparatus in a multicast form, the network connection unit 110 has its own IP information and UDP information in a data packet multicasted to the Ethernet network 100. The multicast data packet is received to separately output stream header information and MPEG transport stream (TS) data. Stream header information and MPEG transport stream (TS) data separated and output from the network connection unit 110 are input to the system controller 130 and the buffer memory 120, respectively.

The system controller 130 extracts a video PID, an audio PID, and a PCR value from the input stream header information and outputs the video PID, the audio PID, and the PCR value to the decoder 140 to update a register value inside the decoder 140. Then, the decoder 140 restores the system clock of the decoder 140 and uses it as the system clock of the decoder 140 when the PCR value is updated. By such a clock recovery operation, underflow and overflow of the decoder internal buffer can be prevented, and lip synchronization of video and audio can be performed and decoding can be accurately performed.

The operation as described above is repeatedly performed whenever a data packet including stream header information is received in FIG. 2.

That is, in the embodiment of the present invention, the clock inside the MPEG decoder is restored by using the video PID, the audio PID, and the PCR values recorded in the stream header information without analyzing the MPEG stream information, which is one component of the multicast data packet. On the other hand, the lip synchronization of audio and video can be properly adjusted.

Meanwhile, in the case of reproducing the transport stream stored in the auxiliary memory device, when the pictures stored on the hard disk surface are read and output to the decoder 140 using the index file as shown in FIG. Search functions such as play and reverse play can be implemented.

That is, in the embodiment of the present invention, after storing the index file generated by using the picture type information and the picture offset information extracted from the stream header information on the hard disk, the location information of the picture to be reproduced according to the user's search command is indexed. The pictures will be read from the file and played back. Therefore, it is possible to support various search functions for consumers.

As described above, since the present invention can synchronize the system time clock in the MPEG decoder with the system time clock in the encoding without analyzing the MPEG stream information, it is possible to decode the MPEG stream having a high bit rate even with a low CPU specification. There is an advantage, and there is an advantage that can simplify the task for analyzing the MPEG stream information.

In addition, since the present invention can generate location information of the picture using picture type information and picture offset information present in the stream header information, and can be used for various search functions, the receiver value based on the MPEG-2 decoder is improved as well as various consumers. There is an advantage to meet your needs.

On the other hand, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (7)

A video file playback apparatus comprising a decoder for decoding an input transport stream, A network connection unit for receiving designated multicast data packets among the multicast data packets from a moving picture file provider and separately outputting stream header information and MPEG transport stream (TS) data from the received multicast data packets; A buffer memory for temporarily storing transport stream (TS) data between the network connection and the decoder; And a system controller extracting at least a video PID, an audio PID, and a PCR value from the stream header information output from the network access unit, and outputting the same to the decoder to control decoding of the transport stream data. Video file playback device using information. The apparatus of claim 1, further comprising: an auxiliary memory device for storing transport stream (TS) data output from the buffer memory; And an index file recording position information of a transport stream (TS) stored in the auxiliary memory device is generated by the system control unit and stored together. The apparatus of claim 2, wherein the index file comprises picture information and offset information indicating position information of each picture. The apparatus of claim 1, wherein the network connection unit; An IP information field in which an IP address and a MAC address are recorded; A UDP information field in which source port information, destination port information, UDP length information, and checksum information are recorded; A stream header information field which records at least stream information including the video PID, audio PID, and PCR value; And at least one or more multicast data packets comprising an MPEG stream field in which MPEG transport stream data having a predetermined size are recorded. The method according to claim 4, wherein the stream header information field; Tag information field, A version information field for version indication of the header information, A payload type information field in which payload type information is recorded; A packet size information field in which packet size information is recorded; And a stream information field in which bit rate information, video PID, audio PID, PCR value, picture type information, and picture offset information are recorded as stream information. The system of claim 5, wherein the system control unit; And generating the index file by using the picture type information and the picture offset information, and adding the file offset information to each picture offset information and providing the location information of the corresponding picture as stream information. The method of claim 2, wherein the system controller is configured to refer to the index file stored in the auxiliary memory device to play the stored transport stream (TS) data at high speed, slow speed, fast reverse playback, slow reverse playback, pause, and 1x speed. A video file playback apparatus using stream header information characterized in that the reverse playback.