JP2004207787A - Audio/video data storage reproducing apparatus, transmission band control apparatus, and transmission band control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio/video data storage reproducing apparatus for ensuring a sufficient transmission band even at special reproduction in addition to ordinary reproduction without the need for extending a resource. <P>SOLUTION: The audio/video data storage reproducing apparatus includes an audio data transmission path to transmit packetized audio data to an AV decoder for ordinary reproduction and a video data transmission path to transmit packetized video data to the AV decoder for the ordinary reproduction or special reproduction, and transmits the video data to the AV decoder by using both the audio data transmission path and the video data transmission path in the case of performing the special reproduction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital video disk (DVD), a digital video tape recorder (D-VTR), a set-top box (STB) having a built-in hard disk drive (HDD), and a personal computer (PC) having a large-capacity HDD. Reads audio data and video data from storage means used in a device capable of storing and reproducing digitized and packetized audio data and video data, and reproduces these data normally. Or, a transmission band control device for controlling a data transmission line for transmission to an AV decoder for decoding for special reproduction, a transmission band control method used when controlling this data transmission line, or this transmission band control Audio / video data recording with device The present invention relates to reproducing apparatus.
[0002]
[Prior art]
As a conventional audio / video data storage / reproduction device capable of reading and reproducing audio / video data at a high speed, for example, there is a high-speed data recording / reproduction device described in Patent Document 1 below.
FIG. 5 is a block diagram showing a main part of the high-speed data recording / reproducing apparatus.
[0003]
This high-speed data recording / reproducing apparatus uses general disk storage devices 911, 921, 931 in order to record and reproduce data for a long time at a high data rate, and is substantially equal to the average access time of each disk storage device as a whole. The purpose is to obtain a data rate.
For this purpose, for example, the audio / video data controlled and read out from the disk storage device 911 by the reading thread 912 independently of other elements is stored in the ring buffer 913 in a predetermined unit.
[0004]
Similarly, audio / video data read from the disk storage device 921 by the reading thread 922 independently controlled by other elements is stored in the ring buffer 923 in a predetermined unit. Similarly, audio / video data read and controlled by the reading thread 932 from the disk storage device 931 independently of other elements is stored in the ring buffer 933 in a predetermined unit.
[0005]
From the ring buffers 913, 923, and 933, the output thread 940 reads audio / video data in a predetermined order, and outputs the audio / video data to the audio / video decoder 942 as an audio / video stream.
At this time, each element is periodically checked by the output thread 940, and a flag is set for an element whose usage rate of the ring buffers 913, 923, and 933 is equal to or less than a predetermined value. The reading threads 912, 922, and 932 have flags set in other elements, and if the usage rates of their own ring buffers 913, 923, and 933 are equal to or higher than a predetermined value, the reading threads 912, 922, and 931 Pause data reading.
[0006]
As described above, by controlling the usage rates of the ring buffers 913, 923, and 933 with the flags, it is possible to absorb fluctuations in the disk storage devices 911, 921, and 931 and to distribute the capacity according to the load.
[0007]
[Patent Document 1] Japanese Patent Application Laid-Open No. 10-207639
[Problems to be solved by the invention]
However, in the conventional high-speed data recording / reproducing apparatus as described above, the load of each element can be evenly distributed and the audio / video signal can be read at high speed. However, the data is transmitted from the output thread or 940 to the audio / video decoder 942. Since only one audio / video bus 948 is to be transmitted and the rest is fixed, the audio / video bus 948 also becomes a bottleneck for the signal read at high speed from each element. 942 cannot be transmitted.
[0009]
In order to solve this problem and to transmit a signal read from each element at a high speed to the audio / video decoder 942, it is necessary to design the audio / video bus 948 to have a very wide band. If this part is to be designed as an LSI, a large area must be occupied on the LSI cell, or the speed of the clock signal must be increased, resulting in high costs.
[0010]
In addition, there is a possibility that an increase in the bus usage time may increase the possibility that congestion will occur in data transfer required for other processing, which may lead to an unstable overall operation. There was a point.
In addition, such a problem is caused by special reproduction, i.e., when trying to perform high-speed reproduction at several times the speed of normal reproduction, even if the normal reproduction of audio / video data is not so large. The video bus 948 also requires a wide bandwidth several times that of the normal playback, and even if the playback process can be performed without any problem in the normal playback, the use of the wide band during the special playback may affect the processing of the entire system. And this was a fatal problem.
[0011]
In order to avoid this problem, if the resource allocation of a limited band in the entire system is set as being aware of special reproduction, the band resource will have a margin at the time of normal reproduction, but on the other hand, Was inefficient for systems that directly affected costs.
[0012]
[Means for Solving the Problems]
The invention described in claim 1 of the present patent application is
Storage means for storing packetized audio data and video data;
Control means for reading out both or one of the audio data and the video data stored from the storage means to perform normal reproduction or special reproduction,
An AV decoder for decoding the read audio data and video data for normal reproduction or special reproduction;
An audio data transmission path for transmitting the read audio data from the control means to the AV decoder;
A video data transmission path for transmitting the read video data from the control means to the AV decoder;
Has,
When the control means performs trick play, the read video data is transmitted from the control device to the AV decoder using both the audio data transmission path and the video data transmission path,
It is an audio / video data storage / playback device.
[0013]
The invention described in claim 2 of the present patent application is
An audio data transmission path for transmitting packetized audio data to an AV decoder for normal reproduction;
A video data transmission path for transmitting packetized video data to an AV decoder for normal reproduction or special reproduction,
When performing the trick play, the video data is transmitted to the AV decoder using both the audio data transmission path and the video data transmission path,
It is a transmission band control device.
[0014]
The invention described in claim 3 of the present patent application is
An audio data transmission procedure for transmitting packetized audio data to an AV decoder for normal reproduction;
A video data transmission procedure for transmitting packetized video data to an AV decoder for normal reproduction or special reproduction,
When performing the trick play, the video data is transmitted to the AV decoder using both the audio data transmission path and the video data transmission path,
This is a transmission band control method.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the invention according to the present patent application (hereinafter, also referred to as the present invention) will be described in detail with reference to the drawings.
(First embodiment of the present invention)
FIG. 1 shows a block diagram of an audio / video data storage / playback apparatus according to a first embodiment of the present invention and a detailed block diagram of a transmission band control device used therein.
[0016]
In the audio / video data storage / playback apparatus of the present embodiment, audio / video data as content to be recorded / reproduced is stored in the audio / video data recording unit 102.
The audio / video data recording unit 102 is an embodiment of a storage unit for storing packetized audio data and video data.
[0017]
The audio / video data recording unit 102 is, for example, a hard disk device, a flexible disk device, or any other fixed or portable type (removable, removable, ), A digital video disc (DVD), a compact disc (CD), and other fixed or portable discs, which are means for recording information by an optical principle. A device, a magneto-optical disk (MO: Magneto Optical) for recording information by combining electromagnetic principles and optics, and various semiconductor memories for storing information electronically using semiconductor elements, such as a DRAM, ROM, SRAM, FRAM, memory cards using these semiconductor RAMs, storage media And a variety of means for storing information by combining a plurality of the above memory means.
[0018]
The audio / video data, which is the content to be recorded / reproduced, stored in the audio / video data recording unit 102 is read by the audio / video data reproduction application unit 103.
The audio / video data reproduction application unit 103 is an embodiment of a control unit that reads out audio data and / or video data stored from the storage unit to perform normal reproduction or special reproduction. .
[0019]
The audio / video data reproduction application unit 103 is, for example, an operation unit of a DVD player and an audio / video data reproduction unit. That is, when the user operates the operation unit of the DVD player according to the first embodiment, the audio / video data reproduction unit of the DVD player is activated, and the audio / video data recorded from the audio / video data recording unit 102 is recorded. Select and read video data.
[0020]
The method of selection and readout is not directly related to the present invention, and a detailed description thereof will be omitted.
Alternatively, in another embodiment, for example, the audio / video data reproduction application section 103 is, for example, a personal computer having a large capacity hard disk (HDD) and audio / video reproduction software running on the personal computer. is there.
[0021]
The user operates the personal computer, starts up the audio / video reproduction software, and operates the personal computer to select and read audio / video data recorded on the HDD, which is the audio / video data recording unit 102. The method of selection and readout in this case is also not directly related to the present invention, and therefore detailed description is omitted.
[0022]
Alternatively, the audio / video data reproduction application unit 103 is, for example, an operation unit of a video camera and an audio / video data reproduction unit.
By operating the operation unit of the video camera, the user captures the audio / video data recorded by the audio / video data recording unit 102 of the video camera, for example, the video camera recorded on a video tape. Select and read. The method of selection and readout in this case is also not directly related to the present invention, and therefore detailed description is omitted.
[0023]
Alternatively, the audio / video data reproduction application unit 103 is, specifically, an operation unit and an audio / video data reproduction unit of a digital broadcast receiver having a built-in HDD, for example.
By operating the operation unit of the digital broadcast receiver, the user receives and records on the digital broadcast receiver which is recorded on, for example, the HDD which is the audio / video data recording unit 102 of the digital broadcast receiver. Select and read audio / video data. The method of selection and readout in this case is also not directly related to the present invention, and therefore detailed description is omitted.
[0024]
In addition, the audio / video data reproducing application unit 103 specifically stores, for example, audio / video data stored in the audio / video data recording unit 102 with or without various operation means. Various means for reading.
The audio / video data read by the audio / video data reproduction application unit 103 is sent to the virtualization library unit 104.
[0025]
This virtualization library unit is, for example, one embodiment of the transmission band control device of the invention according to the present patent application, and the transmission band control device performs one of the transmission band control methods of the invention according to the present patent application. It is an embodiment.
The block configuration of this embodiment of the transmission band control device is shown in FIG. 1 as a part of the block configuration of the audio / video data storage / reproduction device.
[0026]
More specifically and in detail, the audio / video data read by the audio / video data reproduction application unit 103 is divided into audio data and video data, and the data is transmitted via an audio data bus 107 and a video data bus 105, respectively. Are sent to the audio data receiving unit 110 and the video data receiving unit 108, respectively.
[0027]
Further, for example, control information from the audio / video data reproduction application unit 103, more specifically, for example, normal reproduction instruction information, special reproduction instruction information, and the like are sent to the command filtering unit 109 via the command data bus 106. .
Further, the control information, specifically, for example, the normal reproduction instruction information and the special reproduction instruction information is sent to the band control unit 121, and the band control according to the control content is performed by the video data reception unit 108 and the video data division processing unit. 113.
[0028]
It is assumed that this control information is, for example, a normal reproduction instruction signal.
FIG. 2 shows the flow of audio data and video data during the normal reproduction in more detail.
The audio data received by the audio data receiving unit 110 is transmitted to the audio data transmitting unit 114, and further transmitted to the audio / video signal decoder 119 via the audio pipe 117. The video data received by the video data receiving unit 108 is sent to the video data sending unit 112 and further sent to the audio / video signal decoder 119 via the video pipe 115.
[0029]
The audio pipe 117 is for transmitting the read audio data from the audio / video data reproduction application unit 103 which is one embodiment of the control means to the audio / video signal decoder 119 which is one embodiment of the AV decoder. 1 is an embodiment of an audio data transmission path.
The video pipe 115 transmits the read video data from the audio / video data reproduction application unit 103, which is one embodiment of the control unit, to the audio / video signal decoder 119, which is one embodiment of the AV decoder. 1 is an embodiment of the video data transmission path.
[0030]
The video data decoded by the audio / video signal decoder 119 is reproduced by the video data reproducing unit 118.
The video data reproducing unit 118 is, for example, a video monitor display device.
The audio data decoded by the audio / video signal decoder 119 is reproduced by the audio data reproducing unit 120.
[0031]
The audio data reproducing unit 118 is, for example, a speaker or the like.
In this case, the bandwidths of the audio pipe 117 and the video pipe 115 are fully utilized.
It is assumed that this control information is, for example, a special reproduction instruction signal.
FIG. 3 shows the flow of audio data and video data during the special reproduction in more detail.
[0032]
The audio data received by the audio data receiving unit 110 via the audio data bus 107 is not sent to the audio data transmitting unit 114 and is discarded in the virtualization library.
This is because the audio data is not required in the special reproduction because the audio data is not normally reproduced.
[0033]
The video data received by the video data receiving unit 108 via the video data bus 105 has a larger data amount than the video data at the time of normal reproduction due to the need for special reproduction, and has a larger bandwidth for transmission than at the time of normal reproduction. Need.
Therefore, band control is performed by control from the band control unit 121.
Specifically, the video data having a larger data amount than the video data received by the video data receiving unit 108 is sent to the video data division processing unit 113.
[0034]
The video data division processing unit 113 divides the video data having a larger data amount into two, one of which is sent to the video data transmission unit 112 and the other is sent to the audio data transmission unit 114.
As described above, the audio data received by the audio data receiving unit 110 is discarded and not sent to the audio data transmitting unit 114, and the audio data transmitting unit 114 is empty.
[0035]
FIG. 4 shows a state in which video data (Video PES: Packetized Elementary Stream) having a larger data amount is distributed to two transmission paths and transmitted.
As shown in FIG. 4, the data is divided and transmitted into video data (Video PES: Packetized Elementary Stream) and is combined on the receiving side.
[0036]
The video data sent to the audio data transmitting unit 114 is sent to the audio / video signal decoder 119 via the audio pipe 117, and the video data sent to the video data transmitting unit 112 is sent to the audio pipe 117 via the video pipe 115. -It is sent to the video signal decoder 119.
The state at this time is also shown in FIG.
[0037]
The audio / video signal decoder 119 is an embodiment of an AV decoder that decodes the read audio data and video data for normal reproduction or special reproduction.
According to the control signal sent from the command filtering unit 109 via the command pipe 116, the audio / video signal decoder 119 uses the control signal sent from the command filtering unit 109 via the command pipe 116, so that the data sent from the audio pipe 117 and the video pipe 115 are both video data. Must be combined into one video stream.
[0038]
As shown in FIG. 4, video data sent from the audio pipe 117 and the video pipe 115 is temporarily stored in the audio buffer 401 and the video buffer 402.
The PTS of the PES stored in these buffers is display time information recorded in the packet header, and is extracted in ascending order of the PTS and sequentially decoded.
[0039]
Thus, video data can be decoded in an original correct order irrespective of the order of PES arriving at the audio / video signal decoder 119 due to a difference in transmission speed between the audio pipe 117 and the video pipe 115 and other circumstances.
The video data decoded by the audio / video signal decoder 119 is reproduced by the video data reproducing unit 118.
[0040]
The video data reproducing unit 118 is, for example, a video monitor display device.
In this case, the video data having a larger data amount is transmitted separately to the audio pipe 117 and the video pipe 115, so that the vacant audio pipe 117 is effectively used, and the bandwidth of the video pipe 115 is increased. It can be transmitted without expanding according to the data amount.
[0041]
Also in this case, the bands of the audio pipe 117 and the video pipe 115 are fully utilized.
(Other modifications)
Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. The following cases are also included in the present invention.
[0042]
(1) Each of the above devices is, specifically, a computer system including a microprocessor, a ROM, a RAM, a hard disk unit, a display unit, a keyboard, a mouse, and the like. A computer program is stored in the RAM or the hard disk unit. Each device achieves its function by the microprocessor operating according to the computer program.
[0043]
(2) The present invention may be the method described above. Further, these methods may be a computer program that is realized by a computer, or may be a digital signal formed by the computer program.
Further, the present invention provides a computer-readable recording medium for reading the computer program or the digital signal, for example, a flexible disk, a hard disk, a CD-ROM, an MO, a DVD, a DVD-ROM, a DVD-RAM, a BD (Blu-ray Disc). ), A semiconductor memory or the like. Further, the present invention may be the computer program or the digital signal recorded on these recording media.
[0044]
In the present invention, the computer program or the digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, a data broadcast, or the like.
The present invention may also be a computer system including a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor operates according to the computer program.
[0045]
Further, the program or the digital signal is recorded on the recording medium and transferred, or the program or the digital signal is transferred via the network or the like, so that it is executed by another independent computer system. It may be.
(3) The above embodiment and the above modifications may be combined.
[0046]
【The invention's effect】
According to the present invention, a sufficient transmission band can be ensured not only during normal reproduction but also during special reproduction without increasing resources, and its practical value is extremely large.
[Brief description of the drawings]
FIG. 1 is a diagram showing a block configuration of an audio / video data storage / reproduction device according to a first embodiment of the present invention and a detailed block configuration of a transmission band control device used for the audio / video data storage device. FIG. FIG. 3 is a diagram showing the flow of data and video data. FIG. 3 is a diagram showing the flow of audio data and video data during special reproduction. FIG. 4 is a diagram showing a state in which video data is divided into two. FIG. Diagram showing the block configuration of the main part of the data recording / reproducing apparatus.
102 audio / video data recording section 103 audio / video data reproduction application section 104 virtualization library section 105 video data bus 106 command data bus 107 audio data bus 108 video data receiving section 109 command filtering section 110 audio data receiving section 112 Video data transmission unit 113 Video data division processing unit 114 Audio data transmission unit 115 Video pipe 116 Command pipe 117 Audio pipe 118 Video data reproduction unit 119 Audio / video signal decoder 120 Audio data reproduction unit 401 Audio buffer 402 Video buffers 910, 920, 930 Elements 911, 921, 931 Disk storage devices 912, 922, 932 Read thread 91 , 923,933 ring buffer 940 outputs the thread 942 audio and video decoder 944 monitor television 946 speaker 948 audio video bus

Claims (3)

Storage means for storing packetized audio data and video data;
Control means for reading out both or one of the audio data and the video data stored from the storage means to perform normal reproduction or special reproduction,
An AV decoder for decoding the read audio data and video data for normal reproduction or special reproduction;
An audio data transmission path for transmitting the read audio data from the control means to the AV decoder;
A video data transmission path for transmitting the read video data from the control means to the AV decoder;
Has,
When the control means performs trick play, the read video data is transmitted from the control device to the AV decoder using both the audio data transmission path and the video data transmission path,
Audio / video data storage / playback device. An audio data transmission path for transmitting packetized audio data to an AV decoder for normal reproduction;
A video data transmission path for transmitting packetized video data to an AV decoder for normal reproduction or special reproduction,
When performing the trick play, the video data is transmitted to the AV decoder using both the audio data transmission path and the video data transmission path,
Transmission band control device. An audio data transmission procedure for transmitting packetized audio data to an AV decoder for normal reproduction;
A video data transmission procedure for transmitting packetized video data to an AV decoder for normal reproduction or special reproduction,
When performing the trick play, the video data is transmitted to the AV decoder using both the audio data transmission path and the video data transmission path,
Transmission bandwidth control method.

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