JP7635573B2 - Processing device, program, processing method, and processing system - Google Patents

Description

The present invention relates to a processing device, a program, a processing method, and a processing system.

Currently, broadcasting stations are required by the Broadcasting Act to store the data they broadcast. For this reason, each broadcasting station operates a legal simultaneous recording system to store the data they broadcast. One type of legal simultaneous recording system has two devices, and records data in duplicate on both devices. This makes it possible to deal with a failure in one of the devices. However, packet loss does occur.

Regarding how to deal with packet loss, for example, Patent Document 1 discloses a technique for receiving streams via different communication paths and compensating for packets lost in one stream from the other stream by referencing timestamps. Patent Document 2 discloses a technique for saving received packets in a PCAP file format and storing the reception time of each packet in the PCAP file.

JP 2011-186797 A JP 2018-006845 A

However, with the technology described in Patent Document 1, information on the time when the data communication device received the packets is lost, making it difficult to accurately reproduce a stream with the packet order that would have actually been received. Furthermore, with the technology described in Patent Document 2, when a packet loss occurs or the device is stopped, the PCAP file that stores the reception time is lost, making it difficult to accurately reproduce the stream.

The present invention has been made in consideration of the above problems, and the object of the present invention is to provide a new and improved processing device, program, processing method, and processing system that can more appropriately compensate for lost packets.

In order to solve the above problem, according to one aspect of the present invention, a processing device is provided, comprising: a file generation unit that generates a first file group consisting of a plurality of first files including a plurality of packets and a reception time of each packet; and a complementation unit that calculates a difference between the reception times of packets included in both the first file group and a second file group generated by another processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, to the first file using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, wherein the file generation unit identifies the lost packet based on a sequence number of each received packet, and generates a loss information file including loss information indicating the sequence number of the lost packet . In addition, in order to solve the above problem, according to another aspect of the present invention, a processing device is provided that includes a file generation unit that generates a first file group consisting of a plurality of first files including a plurality of packets and the reception time of each packet, and a completion unit that calculates the difference in the reception times of packets included in both the first file group and a second file group generated by another processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet that is lost in the first file, to the first file using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, wherein the file generation unit generates a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined time or more from the packet with the most recent reception time.

In addition, in order to solve the above problem, according to another aspect of the present invention, there is provided a program that causes a computer to function as a file generation unit that generates a first file group consisting of a plurality of packets and a plurality of first files including a plurality of packets and a reception time of each packet, and an addition unit that calculates a difference between the reception times of packets included in both the first file group and a second file group generated by another processing device, and adds to the first file a corresponding packet in the second file group that corresponds to a lost packet that is lost in the first file by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, and the file generation unit identifies the lost packet based on a sequence number of each received packet, and generates a loss information file including loss information indicating the sequence number of the lost packet . In addition, in order to solve the above problem, according to another aspect of the present invention, a program is provided which causes a computer to function as a file generation unit that generates a first file group consisting of a plurality of packets and a plurality of first files including the reception time of each packet, and an addition unit that calculates the difference between the reception times of packets included in both the first file group and a second file group generated by another processing device, and adds to the first file a corresponding packet in the second file group that corresponds to a lost packet that is lost in the first file using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, and the file generation unit generates a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined time or more from the packet whose reception time is the most recent.

In addition, in order to solve the above problem, according to another aspect of the present invention, there is provided a processing method executed in a processing device, the processing method including: a first step of generating a first file group consisting of a plurality of first files including a plurality of packets and a reception time of each packet; a second step of calculating a difference between the reception times of packets included in both the first file group and a second file group generated by another processing device; and a third step of supplementing the first file with a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, wherein the first step includes identifying the lost packet based on a sequence number of each received packet, and generating a loss information file including loss information indicating the sequence number of the lost packet . In addition, in order to solve the above problem, according to another aspect of the present invention, there is provided a processing method executed in a processing device, comprising: a first step of generating a first file group consisting of a plurality of first files including a plurality of packets and a reception time of each packet; a second step of calculating a difference between the reception times of packets included in both the first file group and a second file group generated by another processing device; and a third step of supplementing the first file with a corresponding packet in the second file group corresponding to a lost packet lost in the first file using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, wherein the first step includes generating a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined time or more from the packet with the most recent reception time.

In addition, in order to solve the above problem, according to another aspect of the present invention, there is provided a processing system having a first processing device and a second processing device, wherein the first processing device includes a file generation unit that generates a first file group consisting of a plurality of packets and a plurality of first files including a reception time of each packet, and a complementation unit that calculates a difference between the reception times of packets included in both the first file group and a second file group generated by the second processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, to the first file using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, and the file generation unit identifies the lost packet based on a sequence number of each received packet, and generates a loss information file including loss information indicating the sequence number of the lost packet . In addition, in order to solve the above problem, according to another aspect of the present invention, there is provided a processing system having a first processing device and a second processing device, wherein the first processing device includes a file generation unit that generates a first file group consisting of a plurality of packets and a plurality of first files including a reception time of each packet, and a completion unit that calculates a difference in the reception times of packets included in both the first file group and a second file group generated by the second processing device, and complements a corresponding packet in the second file group corresponding to a lost packet that is lost in the first file, to the first file using a corrected time obtained by correcting the reception time of the corresponding packet by the difference, and the file generation unit generates a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined time or more from the packet with the most recent reception time.

According to the present invention described above, it is possible to more appropriately compensate for lost packets.

1 is an explanatory diagram showing a configuration of a processing system according to an embodiment of the present invention; FIG. 2 is an explanatory diagram showing the configuration of a registration server 20 according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing an example of the configuration of a PCAP file. FIG. 2 is an explanatory diagram showing an example of the configuration of a packet header and a packet. 11 is an explanatory diagram showing a specific example of a file stored in the storage unit 240 of each synchronization server 20. FIG. 13 is an explanatory diagram showing another specific example of the files stored in the storage unit 240 of each synchronization server 20. FIG. FIG. 11 is an explanatory diagram showing an example of packet complementation. FIG. 11 is an explanatory diagram showing an example of packet complementation. 11 is a flowchart showing an operation when a packet is received. 11 is a flowchart showing an operation at the time of transmitting a packet. FIG. 2 is a block diagram showing the hardware configuration of the recording server 20.

The following describes in detail an embodiment of the present invention with reference to the accompanying drawings. Note that in this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

In addition, in this specification and drawings, multiple components having substantially the same functional configuration may be distinguished by adding different letters after the same reference numeral. For example, multiple components having substantially the same functional configuration or logical significance may be distinguished as necessary, such as simultaneous recording servers 20A and 20B. However, if there is no need to particularly distinguish between multiple components having substantially the same functional configuration, only the same reference numeral is assigned to each of the multiple components. For example, if there is no need to particularly distinguish between simultaneous recording servers 20A and 20B, each simultaneous recording server will be simply referred to as simultaneous recording server 20.

<Outline of the processing system>
Currently, broadcasting stations are required by the Broadcasting Act to store broadcast data. One embodiment of the present invention relates to a processing system that performs processing related to the storage of broadcast data. An overview of the processing system according to one embodiment of the present invention will be described below.

Figure 1 is an explanatory diagram showing the configuration of a processing system according to one embodiment of the present invention. As shown in Figure 1, the processing system according to one embodiment of the present invention has an IP broadcast station 10, multiple simultaneous recording servers 20, a confirmation display device 28, and multiple user terminals 30. The multiple simultaneous recording servers 20, the confirmation display device 28, and the multiple user terminals 30 are connected to the IP broadcast station 10 via the Internet 12.

(IP broadcast station 10)
The IP broadcast station 10 transmits RTP (Real-time Transport Protocol) packets of a program by IP (Internet Protocol) multicast via the Internet 12. The IP broadcast station 10 may receive a program via, for example, terrestrial broadcasting, BS broadcasting, or CS broadcasting, and transmit the RTP packets of the received program. Hereinafter, the RTP packets may be simply referred to as packets.

(User terminal 30)
The user terminal 30 receives packets of a program from the IP broadcast station 10, decodes the received packets, and displays and outputs sound of the program using the data obtained by decoding. Although a display device is shown as the user terminal 30 in Fig. 1, the user terminal 30 may be an information terminal such as a PC or a smartphone.

(Recording server 20)
The recording server 20 is an example of a processing device that performs processing related to the storage of packets transmitted from the IP broadcast station 10. When the recording server 20A receives a plurality of packets from the IP broadcast station 10, it generates a PCAP (Packet Capture) file including the plurality of packets as a first file and stores the file. Similarly, when the recording server 20B receives a plurality of packets from the IP broadcast station 10, it generates a PCAP file including the plurality of packets as a second file and stores the file.

When it becomes necessary to confirm a broadcasted program, the simultaneous recording server 20 transmits packets contained in the PCAP file of that program to the confirmation display device 28. For example, when a user watching the program using the user terminal 30 inquires about the broadcast quality of the program, the simultaneous recording server 20 transmits packets to the confirmation display device 28 according to the operator's operation to confirm the quality at which the program was broadcast.

(Confirmation display device 28)
The confirmation display device 28 receives packets transmitted from the simultaneous recording server 20, decodes the received packets, and uses the data obtained by the decoding to display the program and output the audio. The person checking can check the quality of the program broadcast based on the display and audio output from the confirmation display device 28.

Here, even if the user terminal 30 successfully receives a packet, the simultaneous recording server 20A or the simultaneous recording server 20B may fail to receive the packet. Therefore, even if a packet stored in the simultaneous recording server 20A is sent to the confirmation display device 28, the display and audio output from the confirmation display device 28 may differ from the display and audio actually broadcast and output from the user terminal 30.

Therefore, in one embodiment of the present invention, the packet that the recording server 20A failed to receive is complemented by a packet stored in the recording server 20B. Furthermore, the packet is complemented so that the packet is in an appropriate sequential position in relation to other packets. The configuration and operation of the recording server 20 according to one embodiment of the present invention will be described in detail below.

<Configuration of the recording server 20>
2 is a diagram illustrating the configuration of the recording server 20 according to an embodiment of the present invention. As shown in FIG. 2, the recording server 20 according to an embodiment of the present invention includes a communication unit 220, a file generation unit 230, a storage unit 240, and a completion unit 250.

(Communication unit 220)
The communication unit 220 functions as a receiver that receives packets from the IP broadcast station 10, and as a transmitter that transmits packets to the confirmation display device 28. The communication unit 220 can also communicate with other simultaneous recording servers 20. For example, the communication unit 220 receives a PCAP file from another simultaneous recording server 20.

(File Generation Unit 230)
The file generator 230 generates a PCAP file, a lost file, and a miss file based on the reception of packets by the IP broadcast station 10. The PCAP file is a file that includes a plurality of packets. First, the structure of the PCAP file will be described in more detail with reference to Figs. 3 and 4.

Figure 3 is an explanatory diagram showing an example of the structure of a PCAP file. As shown in Figure 3, a PCAP file includes a file header, multiple packet headers, and multiple packets. A PCAP file is generated, for example, at one-second intervals, and the file names of multiple consecutive PCAP files use numbers in seconds, such as "01.pcap" and "02.pcap."

Figure 4 is an explanatory diagram showing an example of the configuration of a packet header and a packet. As shown in Figure 4, the packet header includes time information. The file generation unit 230 records, as the time information, information indicating the reception time of the packet that is paired with the packet header.

Like the PCAP file, the lost file and the miss file are also generated at intervals of, for example, one second. The lost files are given file names such as "01.lost" and "02.lost", and the miss files are given file names such as "01.miss" and "02.miss".

When a packet that is missing a sequence number, i.e., a lost packet, exists in a certain PCAP file, the file generation unit 230 records loss information indicating the sequence number of the lost packet in the lost file corresponding to the PCAP file. In other words, the lost file is an example of a loss information file.

In addition, when a reception interruption occurs in which the next packet is not received for a predetermined time or longer from the reception time of the most recent packet, the file generation unit 230 records reception interruption information in a miss file. In other words, the miss file is an example of a reception interruption information file.

(Memory unit 240)
The storage unit 240 stores various data used in the operation of the recording server 20. For example, the storage unit 240 stores (preserves) the PCAP file, the lost file, and the miss file generated by the file generating unit 230. Here, with reference to FIG. 5, a specific example of a file stored in the storage unit 240 of the recording server 20A and a specific example of a file stored in the storage unit 240 of the recording server 20B will be described.

Figure 5 is an explanatory diagram showing specific examples of files stored in the memory unit 240 of each recording server 20. More specifically, the upper part of Figure 5 shows the PCAP file group, lost file group, and miss file group stored in the memory unit 240 of recording server 20A, and the lower part of Figure 5 shows the PCAP file group, lost file group, and miss file group stored in the memory unit 240 of recording server 20B. Furthermore, rectangles in the PCAP files indicate packets, and numbers in the packets indicate the sequence numbers of the packets.

In the example shown in FIG. 5, a packet with sequence number "8" is missing from "02.pcap" stored in the memory unit 240 of the recording server 20A. Therefore, "8", which is the sequence number of the lost packet, is recorded in "02.lost" corresponding to "02.pcap".

On the other hand, the PCAP file group stored in the memory unit 240 of the simultaneous recording server 20B contains a packet with a sequence number of "8". Therefore, the memory unit 240 of the simultaneous recording server 20B does not store a lost file containing the sequence number "8".

Figure 6 is an explanatory diagram showing another specific example of files stored in the memory unit 240 of each recording server 20. In the example shown in Figure 6, in the PCAP file group stored in the memory unit 240 of the recording server 20A, a reception interruption lasting more than a predetermined time occurs between packets "10" and "16", and no packets exist between packets "10" and "16". Therefore, "occurred", indicating that a reception interruption has occurred, is recorded in "02.miss" and "03.miss". Note that packets that are not received due to a reception interruption also fall under the category of lost packets.

On the other hand, since no interruption in reception has occurred in the PCAP file group stored in the memory unit 240 of the recording server 20B, no miss file containing "occurred", which indicates that an interruption in reception has occurred, is stored.

(Complementation Unit 250)
In the process of transmitting packets from the simultaneous recording server 20 to the confirmation display device 28, the complementing unit 250 complements lost packets that are lost in the PCAP files stored in the memory unit 240 by using corresponding packets that are stored in other simultaneous recording servers 20 and correspond to the lost packets. The complementing unit 250 can grasp the presence of lost packets by checking the lost file and the missing file.

Below, we will explain in detail the complementation process when a sequence number is recorded in the lost file, and the complementation process when the reception interruption information "occurred" is recorded in the miss file.

As shown in FIG. 5, if sequence number "8" is recorded in "02.lost", the complementing unit 250 of the simultaneous recording server 20A requests multiple PCAP files including "02.pcap" from the simultaneous recording server 20B. For example, the complementing unit 250 requests "01.pcap", "02.pcap", and "03.pcap", which overlap within one second before and after "02.pcap", from the simultaneous recording server 20B, and obtains these PCAP files from the simultaneous recording server 20B.

Then, the complementation unit 250 of the recording server 20A calculates the time difference t, which is the difference between the time information (reception time) of packets contained in both the PCAP file group stored in the memory unit 240 and the PCAP file group acquired from the recording server 20B. The packets contained in both are considered to have been received by the recording server 20A and the recording server 20B at approximately the same time, but the time information recorded in the packet header may have a time difference corresponding to the difference between the internal clock of the recording server 20A and the internal clock of the recording server 20B. In other words, the above time difference t can be considered as a value indicating the difference between the internal clock of the recording server 20A and the internal clock of the recording server 20B.

For example, the complementation unit 250 of the recording server 20A calculates the time difference t using packet "7", which is the packet immediately before the lost packet. If the time information of packet "7" stored in the recording server 20A is t7_1 and the time information of packet "7" obtained from the recording server 20B is t7_2, the time difference t can be calculated as (t7_1 - t7_2).

Furthermore, the complementing unit 250 of the recording server 20A complements the packet "8" acquired from the recording server 20B as a corresponding packet corresponding to the lost packet "8" in the PCAP file stored in the recording server 20A. Here, the complementing unit 250 corrects the time information of the packet 8 acquired from the recording server 20B using the above-mentioned time difference t.

For example, if the time information of packet 8 obtained from the simultaneous recording server 20B is t8_2, the complementing unit 250 of the simultaneous recording server 20A calculates (t8_2-t) to obtain the corrected time t8_1. As a result, as shown in FIG. 7, in "02.pcap" stored in the simultaneous recording server 20A, packet "8" is complemented so that it is positioned before packet "7".

On the other hand, as shown in FIG. 6, if "occurred" is recorded in "02.miss" and "03.miss", indicating that a reception interruption has occurred, the complementing unit 250 requests multiple PCAP files including "02.pcap" and "03.pcap" from the recording server 20B. For example, the complementing unit 250 requests "01.pcap" to "04.pcap", which overlap within one second before and after "02.pcap" and "03.pcap", from the recording server 20B, and acquires these PCAP files from the recording server 20B.

Then, the complementing unit 250 of the recording server 20A calculates the time difference t, which is the difference between the time information (reception time) of packets contained in both the PCAP file group stored in the memory unit 240 and the PCAP file group acquired from the recording server 20B. For example, the time difference t is calculated using packet "10." If the time information of packet "10" stored in the recording server 20A is t10_1 and the time information of packet "10" acquired from the recording server 20B is t10_2, then the time difference t can be calculated as (t10_1 - t10_2).

Furthermore, the complementing unit 250 of the recording server 20A complements packets "11" to "15" acquired from the recording server 20B as packets corresponding to the lost packets "11" to "15" in the PCAP file group stored in the recording server 20A. Here, the complementing unit 250 corrects the time information of packets "11" to "15" acquired from the recording server 20B using the time difference t.

For example, if the packet n time information acquired from the simultaneous recording server 20B is tn_2, the complementing unit 250 of the simultaneous recording server 20A calculates (tn_2-t) to obtain the corrected time tn_1. As a result, as shown in FIG. 8, packets "11" to "15" are complemented so that they are sequentially positioned between packets "10" and "16" in the PCAP file group stored in the simultaneous recording server 20A.

<Operation>
The configuration of the registration server 20 according to an embodiment of the present invention has been described above. Next, the operation of the registration server 20 according to an embodiment of the present invention will be summarized with reference to Figs.

Figure 9 is a flow chart showing the operation when receiving a packet. As shown in Figure 9, the communication unit 220 of the recording server 20 receives a packet transmitted from the IP broadcast station 10 (S304). The file generation unit 230 determines whether or not there is a lost packet among the multiple packets received (S308). If there is a lost packet (S308/Yes), the file generation unit 230 generates a lost file that includes the sequence number of the lost packet (S312).

The file generation unit 230 also determines whether a reception interruption has occurred (S316). If a reception interruption has occurred (S316/Yes), the file generation unit 230 generates a miss file that includes, for example, "occurred" as reception interruption information (S320).

Furthermore, the file generation unit 230 generates a PCAP file that includes multiple packets (S324). The PCAP file, the lost file, and the miss file are stored in the storage unit 240. Then, the processes of S304 to S328 are repeated until the operation of the recording server 20 is terminated (S328).

Figure 10 is a flowchart showing the operation when transmitting packets. As shown in Figure 10, the complementing unit 250 reads files (PCAP file, lost file, and miss file) for a certain time for the program to be transmitted from the storage unit 240 (S404). If the lost file contains a packet sequence number (S408/Yes), or if the miss file contains reception interruption information (S412/Yes), the complementing unit 250 acquires a group of PCAP files that overlap, for example, one second before and after the time from another simultaneous recording server 20 (S416).

Then, the complementing unit 250 calculates the time difference t, which is the difference between the time information (reception time) of packets contained in both the PCAP file group stored in the memory unit 240 and the PCAP file group acquired from another simultaneous recording server 20 (S420).

Furthermore, the complementing unit 250 complements the corresponding packets corresponding to the lost packets among the packets included in the PCAP file group acquired from the other simultaneous recording servers 20 to the PCAP file group stored in the storage unit 240 (S424). Here, the complementing unit 250 corrects the time information of the corresponding packets by the above-mentioned time difference t, and updates the time information included in the packet header of the corresponding packets to the corrected time obtained by the correction.

Then, the communication unit 220 checks the time information of each packet, determines the transmission time of each packet based on the time information, and goes to sleep until the transmission time of each packet (S428). The communication unit 220 returns from sleep at the transmission time of each packet and transmits the packet (S432).

<Action and effect>
According to the embodiment of the present invention described above, various operational effects can be obtained. For example, according to the embodiment of the present invention, it is possible to complement a packet that was not received due to a packet loss or interruption in one recording server 20 with a corresponding packet stored in another recording server 20.

The recording server 20 also corrects the time information of the corresponding packets using the time difference t, which corresponds to the difference between the internal clocks of both recording servers 20, so that it is possible to complement the corresponding packets so that they are in the appropriate sequential position in the PCAP files stored in the recording server 20. Therefore, in the process of transmitting packets from the recording server 20 to the confirmation display device 28, the recording server 20 can transmit the packets to the confirmation display device 28 in the order in which they would have arrived at the user terminal 30 from the IP broadcast station 10. As a result, the confirmation display device 28 is expected to output a display and sound that is the same as the display and sound that were actually broadcast and output from the user terminal 30.

Furthermore, since the time difference t is calculated using packets received near the time when packet loss or interruption occurred, it is possible to calculate a highly accurate value for the time difference t, and as a result, it is possible to more accurately correct the time information of the corresponding packet that is complemented.

<Hardware Configuration>
The above is a description of the embodiments of the present invention. The information processing, such as the generation of files and the completion of packets, described above, is realized by the cooperation of software and the hardware of the recording server 20, which will be described below.

Figure 11 is a block diagram showing the hardware configuration of the recording server 20. The recording server 20 includes a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, and a host bus 204. The recording server 20 also includes a bridge 205, an external bus 206, an interface 207, an input device 208, a display device 209, an audio output device 210, a storage device (HDD) 211, a drive 212, and a network interface 215.

The CPU 201 functions as an arithmetic processing device and control device, and controls the overall operation of the recording server 20 in accordance with various programs. The CPU 201 may also be a microprocessor. The ROM 202 stores programs and arithmetic parameters used by the CPU 201. The RAM 203 temporarily stores programs used in the execution of the CPU 201 and parameters that change appropriately during the execution. These are interconnected by a host bus 204 consisting of a CPU bus and the like. The functions of the file generation unit 230 and the completion unit 250 can be realized by the cooperation of the CPU 201, ROM 202, and RAM 203 with software.

The host bus 204 is connected to an external bus 206, such as a PCI (Peripheral Component Interconnect/Interface) bus, via a bridge 205. Note that the host bus 204, bridge 205, and external bus 206 do not necessarily need to be configured separately, and these functions may be implemented on a single bus.

The input device 208 is composed of input means for the user to input information, such as a mouse, keyboard, touch panel, button, microphone, sensor, switch, and lever, and an input control circuit that generates an input signal based on the user's input and outputs it to the CPU 201. A user of the recording server 20 can input various data and instruct processing operations to the recording server 20 by operating the input device 208.

The display device 209 includes display devices such as a liquid crystal display (LCD) device, a projector device, an OLED (Organic Light Emitting Diode) device, and a lamp. The audio output device 210 includes audio output devices such as a speaker and headphones.

The storage device 211 is a data storage device configured as an example of the storage unit of the recording server 20 according to this embodiment. The storage device 211 may include a storage medium, a recording device that records data on the storage medium, a reading device that reads data from the storage medium, and a deleting device that deletes data recorded on the storage medium. The storage device 211 is configured, for example, with a HDD (Hard Disk Drive) or SSD (Solid Storage Drive), or a memory with equivalent functions. This storage device 211 drives the storage and stores the programs executed by the CPU 201 and various data.

The drive 212 is a reader/writer for storage media, and is built into the recording server 20 or attached externally. The drive 212 reads information recorded on a removable storage medium 24, such as an attached magnetic disk, optical disk, magneto-optical disk, or semiconductor memory, and outputs the information to the RAM 203 or the storage device 211. The drive 212 can also write information to the removable storage medium 24.

The network interface 215 is, for example, a communication interface configured with a communication device for connecting to the Internet 12. The network interface 215 may be a wireless LAN (Local Area Network) compatible communication device or a wired communication device that performs wired communication.

The hardware configuration of the recording server 20 described above can also be applied to the IP broadcast station 10 and the user terminal 30, etc.

<Conclusion>
Although the preferred embodiment of the present invention has been described in detail above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person having ordinary knowledge in the technical field to which the present invention pertains can conceive of various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention.

For example, each step in the processing of the recording server 20 in this specification does not necessarily have to be processed chronologically in the order described in the sequence diagram or flowchart. For example, each step in the processing of the recording server 20 may be processed in an order different from the order described in the flowchart, or may be processed in parallel.

It is also possible to create a computer program that causes the hardware, such as the CPU, ROM, and RAM, built into the recording server 20 to perform functions equivalent to those of the components of the recording server 20 described above. A storage medium that stores the computer program is also provided.

REFERENCE SIGNS LIST 10 IP broadcast station 20 Recording server 220 Communication unit 230 File generation unit 240 Storage unit 250 Complement unit 28 Confirmation display device 30 User terminal

Claims (9)

a file generating unit that generates a first file group including a plurality of packets and a plurality of first files including a reception time of each packet;
a complementing unit that calculates a difference between reception times of packets included in both the first file group and a second file group generated by another processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, to the first file by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference;
Equipped with
The file generation unit identifies the lost packets based on a sequence number of each received packet, and generates a loss information file including loss information indicating the sequence numbers of the lost packets . a file generating unit that generates a first file group including a plurality of packets and a plurality of first files including a reception time of each packet;
a complementing unit that calculates a difference between reception times of packets included in both the first file group and a second file group generated by another processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, to the first file by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference;
Equipped with
The file generation unit generates a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined time or more from the packet with the most recent reception time. the processing device further includes a file acquisition unit configured to acquire, from the other processing device, the second file group including a specific second file corresponding to the lost packet or the first file in which the reception interruption has occurred and second files preceding and succeeding the specific second file;
The processing device according to claim 2 , wherein the complementing unit executes the complementing using the second file group acquired by the file acquisition unit. Computer,
a file generating unit that generates a first file group including a plurality of packets and a plurality of first files including a reception time of each packet;
a complementing unit that calculates a difference between reception times of packets included in both the first file group and a second file group generated by another processing device, and complements a corresponding packet in the second file group corresponding to a lost packet lost in the first file, in the first file, by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference;
Function as a
The file generation unit identifies the lost packets based on a sequence number of each received packet, and generates a loss information file including loss information indicating the sequence numbers of the lost packets . Computer,
a file generating unit that generates a first file group including a plurality of packets and a plurality of first files including a reception time of each packet;
a complementing unit that calculates a difference between reception times of packets included in both the first file group and a second file group generated by another processing device, and complements a corresponding packet in the second file group corresponding to a lost packet lost in the first file, in the first file, by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference;
Functioning as a
The file generation unit generates a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined period of time or more from the packet with the most recent reception time. A processing method carried out in a processing device, comprising:
A first step of generating a first file group including a plurality of first files each including a plurality of packets and a reception time of each packet;
a second step of calculating a difference between reception times of packets included in both the first file group and a second file group generated by another processing device;
a third step of supplementing a corresponding packet in the second file group corresponding to a lost packet lost in the first file to the first file by using a correction time obtained by correcting the reception time of the corresponding packet by the difference;
Including,
The processing method , wherein the first step includes identifying the lost packets based on a sequence number of each received packet, and generating a loss information file including loss information indicating the sequence numbers of the lost packets . A processing method carried out in a processing device, comprising:
A first step of generating a first file group including a plurality of first files each including a plurality of packets and a reception time of each packet;
a second step of calculating a difference between reception times of packets included in both the first file group and a second file group generated by another processing device;
a third step of supplementing a corresponding packet in the second file group corresponding to a lost packet lost in the first file to the first file by using a correction time obtained by correcting the reception time of the corresponding packet by the difference;
Including,
The first step is a processing method including generating a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined time or more since the packet with the most recent reception time. 1. A processing system having a first processing device and a second processing device,
The first processing device includes:
a file generating unit that generates a first file group including a plurality of packets and a plurality of first files including a reception time of each packet;
a complementing unit that calculates a difference between the reception times of packets included in both the first file group and the second file group generated by the second processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, to the first file by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference;
Equipped with
The file generator identifies the lost packets based on a sequence number of each received packet, and generates a loss information file including loss information indicating the sequence numbers of the lost packets . 1. A processing system having a first processing device and a second processing device,
The first processing device includes:
a file generating unit that generates a first file group including a plurality of packets and a plurality of first files including a reception time of each packet;
a complementing unit that calculates a difference between the reception times of packets included in both the first file group and the second file group generated by the second processing device, and complements a corresponding packet in the second file group that corresponds to a lost packet lost in the first file, to the first file by using a corrected time obtained by correcting the reception time of the corresponding packet by the difference;
Equipped with
The file generation unit generates a reception interruption information file including reception interruption information when a reception interruption occurs in which the next packet is not received for a predetermined period of time or more since the most recently received packet.

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