JP6973105B2 - Multiplexing device and multiplexing method - Google Patents

Description

The present technology relates to a multiplexing device and a multiplexing method.

In terrestrial digital television broadcasting and advanced BS digital broadcasting, a weak layer service called One Seg and a strong layer service called Full Seg are multiplexed in the same channel. Further, in these television broadcasts, it is possible to multiplex and broadcast a plurality of channels within the same channel, or to switch to only one channel depending on the time zone. For such broadcasting, a multiplexing device for multiplexing content packets is used in the system on the broadcasting station side.

For example, in Patent Document 1, for an IP packet containing clock information necessary for synchronizing the clock on the receiving side with the clock on the transmitting side, the delay amount is calculated in the priority input buffer, encapsulated in a TLV packet, and slotted. A transmitter that is stored in a frame to form a frame and transmits a modulated signal is disclosed. The frame configuration unit inputs a TLV packet containing clock information and a delay amount from the priority input buffer, a TLV packet not including clock information from the input buffer, and time information from a timer, and is a unit for channel coding. The TLV packet is stored in the slot, and the delay amount is stored in the slot header.

Further, the frame component unit outputs a trigger having a fixed cycle to the priority input buffer and the input buffer together with a specified amount indicating the amount of bytes that can be stored in the slot, based on the time information. As a result, the TLV packet input corresponding to the trigger is stored in the slot, and a frame is formed. Then, the frame component unit outputs the frame composed of the slots to the transmission line coding processing unit. The modulation processing unit inputs data that has undergone transmission line coding processing from the transmission line coding processing unit, performs modulation processing, and generates a modulation signal.

Japanese Unexamined Patent Publication No. 2011-103568

As described above, the transmission device on the broadcasting station side that provides the broadcasting service of a plurality of layers is configured so that the setting of the layers can be changed depending on the time zone. However, since there is a time difference in the provision time of the broadcasting service of each layer, when the setting of the layer is changed, the end of the content may not be provided due to the time difference and may be omitted.

The transmission device disclosed in Patent Document 1 does not provide a broadcasting service having a plurality of layers, and does not have a configuration for solving the above-mentioned problems.

An object of the present invention is to provide a multiplexing device and a multiplexing method that can prevent the end of content from being omitted when the setting of the hierarchy of a broadcasting service is changed.

The multiplexing device according to one aspect of the present invention has a packet input unit for inputting packets of a plurality of layers, a plurality of buffers corresponding to the plurality of layers, and a packet when there is an instruction to change the layers. Temporary buffers for temporary storage, a hierarchical distribution unit that distributes the packets to the plurality of buffers based on the layer, and distributes the packets to the temporary buffer when there is an instruction to change the layer, and a layer change instruction. It has a TLV packet generation unit that reads the packet from the plurality of buffers at the time of the occurrence, reads the packet allocated to the temporary buffer after the plurality of buffers are all emptied, and generates a TLV packet. ..

Further, in the multiplexing method according to another aspect of the present invention, packets having a plurality of layers are input, the packets are distributed to a plurality of buffers corresponding to the plurality of layers, and the packets are temporarily distributed when a layer change instruction is given. Allocate to the buffer, read the packet from the plurality of buffers when there is an instruction to change the hierarchy, read the packet allocated to the temporary buffer after all the plurality of buffers are empty, and read the TLV packet. Generate.

Further, the program according to still another aspect of the present invention is a packet input unit for inputting a packet of a plurality of layers, a plurality of buffers corresponding to the plurality of layers, and a packet when a change instruction of the layer is given. A temporary buffer that temporarily stores the packet, a layer distribution unit that distributes the packet to the plurality of buffers based on the layer, and distributes the packet to the temporary buffer when there is an instruction to change the layer, and an instruction to change the layer. When there is, the packet is read from the plurality of buffers, and after the plurality of buffers are all emptied, the packet is read from the temporary buffer to generate a TLV packet.

According to the above aspect of the present invention, it is possible to prevent the end of the content from being omitted when the setting of the hierarchy of the broadcasting service is changed.

FIG. 1 is a block diagram showing the configuration of the first embodiment. FIG. 2 is a diagram showing an outline of the operation of FIG. 1. FIG. 3 is a flowchart showing the operation of FIG. FIG. 4 is a block diagram showing the configuration of the second embodiment. FIG. 5 is a flowchart showing the operation of FIG. FIG. 6 is a block diagram showing the configuration of the third embodiment. FIG. 7 is a flowchart showing the operation of FIG. FIG. 8 is a diagram showing an example of a computer configuration that realizes each part of each embodiment.

Next, an exemplary first embodiment will be described with reference to the drawings. In the TLV packet multiplexing device 1 of the present embodiment, in a digital broadcasting transmitting device, input video, audio, and data packets are multiplexed to form each slot, and 120 slots further form one frame to form a TLV. Used to generate packets.

The digital broadcasting transmission device can set a plurality of transmission modes in slots in one frame, form layers according to each transmission mode, and perform layered transmission of a TLV format stream. The transmission mode setting is, for example, a setting related to transmission line coding, and means a setting such as a modulation method of a transmission main signal, a coding rate of error correction internal coding, satellite output backoff, and the number of allocated slots. .. For the distribution of the packet hierarchy, for example, the correspondence between the identification information of the video, voice, and data packets input to the TLV packet multiplexing device 1 and the hierarchy is set in the TLV packet multiplexing device 1, and the TLV packet multiplexing device 1 is used. Is realized by performing hierarchical distribution based on packet identification information.

The transmission mode is set for each slot position in the frame by TMCC (Transmission & Multiplexing Control) information. When the TMCC information is changed, the TMCC setting message is input to the TLV packet multiplexing device 1. Therefore, the change in the hierarchy can be detected by the TMCC setting message. Further, the change of the hierarchy is instructed by the IF_IN hierarchy setting message before the change is actually made by the TMCC information. Therefore, the hierarchy change instruction can be detected by the IF_IN hierarchy setting telegram.

FIG. 1 is a block diagram showing the configuration of the first embodiment. As shown in FIG. 1, the TLV packet multiplexing device 1 of the present embodiment has a packet input unit 11, a hierarchical distribution unit 12, N buffers 131 to 13N (N is an integer of 2 or more), and a temporary buffer 13N. It includes a buffer 13 and a TLV packet generation unit 14. The packet input unit 11 inputs packets having N layers (N is an integer of 2 or more) having different transmission mode settings.

N buffers 131 to 13N are provided corresponding to each layer, and packets distributed based on the layer are temporarily stored. Further, the temporary buffer 13 temporarily stores the packet when there is an instruction to change the hierarchy.

The hierarchical distribution unit 12 is set to correspond to the layer with the identification information of the video, audio, and data packets input to the TLV packet multiplexing device 1, and the layer distribution unit 12 identifies the input packet. Determine the hierarchy of packets input from the information. Then, the layer distribution unit 12 distributes the packets input to the TLV packet multiplexing device 1 to a plurality of buffers 131 to 13N based on the layer. Further, the layer distribution unit 12 distributes the input packet to the temporary buffer 13 when there is an instruction to change the layer by the IF_IN layer setting telegram.

The TLV packet generation unit 14 continues reading from the plurality of buffers 131 to 13N corresponding to the layer before the change even if there is an instruction to change the layer. That is, the TLV packet generation unit 14 reads packets from the plurality of buffers 131 to 13N corresponding to the layer before the change even after detecting the layer change instruction, and after the plurality of buffers are all empty, the temporary buffer. Read the packet distributed to 13. Then, the TLV packet generation unit 14 multiplexes the read packet and generates a TLV packet.

It should be noted that the timing at which the hierarchical distribution unit 12 reads the packet from the temporary buffer 13 and the timing at which the TLV packet generation unit 14 reads the distributed packet can be considered variously. For example, packets are started to be read from the temporary buffer 13 before all the plurality of buffers are empty, distributed to the changed hierarchy and temporarily stored in a storage unit (not shown), and the plurality of buffers 131 to 13N are all empty. After that, the TLV packet generation unit 14 may read the distributed packet from a storage unit (not shown).

Further, the TLV packet generation unit 14 reads out the packets distributed to the temporary buffer 13 by the layer distribution unit 12 after all the plurality of buffers are emptied and the layer change is detected by the TMCC setting message. It may be distributed to the changed layer, and the TLV packet generation unit 14 may read the distributed packet.

The layer distribution unit 12 distributes the packet input from the packet input unit 11 to a plurality of buffers 131 to 13N corresponding to the changed layer. Further, the TLV packet generation unit 14 reads the packets distributed to the changed layer from the plurality of buffers 131 to 13N after the reading of the packets distributed to the temporary buffer 13 is completed.

It should be noted that each component of the transmission device of the first embodiment shown in FIG. 1 and other embodiments described later shows a block of functional units. A part or all of each component of the transmitting device of each embodiment may be realized by any combination of a computer 50 and a program as shown in FIG. 8, for example. As an example, the computer 50 includes the following configuration.

-CPU (Central Processing Unit) 51
-ROM (Read Only Memory) 52
-RAM (Random Access Memory) 53
-Program 54 loaded into RAM 53
A storage device 55 for storing the program 54.
A drive device 57 that reads and writes the recording medium 56.
-Communication interface 58 connected to the communication network 59
-I / O interface 60 for inputting / outputting data
-Bus 61 connecting each component
Each component of each embodiment is realized by the CPU 51 acquiring and executing the program 54 that realizes these functions. For example, in the example of the TLV packet multiplexing device 1 of FIG. 1, the function of the packet input unit 11 may be realized by the CPU 51 that has acquired the program 54 performing packet input processing based on the program 54. The buffers 131 to 13N function, for example, when the CPU 51 that has acquired the program 54 allocates each area to the RAM 53 and temporarily stores the packets allocated to the areas of the buffers 131 to the buffer 13N allocated to the RAM 53. May be realized. The temporary buffer 13 temporarily stores the packet in the area of the temporary buffer 13 allocated to the RAM 53 when, for example, the CPU 51 that has acquired the program 54 allocates the area to the RAM 53 and is instructed to change the plurality of layers described above. The function may be realized by performing the process. The hierarchical distribution unit 12 may realize the function by, for example, the CPU 51 that has acquired the program 54 distributes the packet to the areas of the buffer 131 to the buffer 13N and the temporary buffer 13 allocated to the RAM 53. The TLV packet generation unit 14 may also realize the function by, for example, the CPU 51 that has acquired the program 54 reads a packet from the area allocated to the RAM 53 based on the program 54 and generates a TLV packet.

The program 54 that realizes the functions of each component of each embodiment is stored in, for example, a storage device 55, a ROM 52, or a RAM 53 in advance, and may be configured to be read by the CPU 51 as needed. The program 54 may be supplied to the CPU 51 via the communication network 59, or may be stored in the recording medium 56 in advance, and the drive device 57 may read the program and supply the program to the CPU 51.

Next, the operation of this embodiment will be described. FIG. 2 is a diagram showing an outline of the operation of FIG. 1. The example of FIG. 2 is an example in which the setting of the hierarchy is changed from two of the hierarchy A and the hierarchy B to only one of the hierarchy A.

As shown in FIG. 2, the packet input unit 11 inputs packets 201 to 216 to the hierarchical distribution unit. Assuming that the packets 201 to 203 are the packets of the layer A and the packets 204 to 206 are the packets of the layer B, as shown in FIG. 2, the layer distribution unit 12 sets the packets 201 to 203 in the buffer 131 corresponding to the layer A. Allocate to. Further, the layer distribution unit 12 distributes packets 204 to 206 to the buffer 132 corresponding to the layer B.

The packets distributed to the buffers 131 and 132 and temporarily stored are read from the buffers 131 and 132 by the TLV packet generation unit 14. The number of slots N1 is set for the layer A, the number of slots N2 is set for the layer B, and the TLV packet generation unit 14 has the number of slots N1 set for each layer from the buffers 131 and 132 corresponding to each layer. Read the packet for the period corresponding to N2. Further, the TLV packet generation unit 14 periodically reads out packets from a plurality of buffers corresponding to each layer in a predetermined order.

For example, as shown in FIG. 2, the TLV packet generation unit 14 first reads packets 201, 202, 203 temporarily stored for a period corresponding to the number of slots N1 from the buffer 131, and then corresponds to the number of slots N2 from the buffer 132. During this period, the packets 204 and 205 that are temporarily stored are read out. As shown in FIG. 2, since the number of slots N2 set in the layer B is small, the packet 206 may not be read. In this case, the packet 206 that was not read will be read in the next cycle.

As shown in FIG. 2, it is assumed that an instruction to change the setting not to use the layer B is input at the timing when the reading is completed without reading the packet 206 from the buffer corresponding to the layer B.

If packets 207 to 210 are distributed to buffer 131, such as packets 201, 202, 203, and are read only from buffer 131 according to the changed settings, packet 206 remains unread.

Therefore, in the present embodiment, when the IF_IN layer setting message instructs to change the layer setting, the layer distribution unit 12 distributes the packet input from the packet input unit 11 to the temporary buffer 13. Further, the TLV packet generation unit 14 reads a packet from the buffers 131 and 132 corresponding to the layer before the change and generates a TLV packet even if there is an instruction to change the layer. Then, after all the buffers 131 and 132 corresponding to the layer before the change are emptied, the TLV packet generation unit 14 reads the packets 207 to 212 from the temporary buffer 13 and generates a TLV packet. After that, the TLV packet generation unit 14 reads the packet from the buffer corresponding to the changed layer and generates the TLV packet.

One cycle after the instruction to change the layer, the TMCC information setting message is input to the TLV packet multiplexing device 1, and the TLV packet generation unit 14 starts packet generation with the changed layer setting. When the TMCC information setting message is input to the TLV packet multiplexing device 1, the TLV packet generation unit 14 reads 212 from the packet 207 from the temporary buffer 13, and when the temporary buffer 13 becomes empty, the buffer 131 corresponding to the layer A Read packets 213 to 216.

FIG. 3 is a flowchart showing the operation of FIG. In the TLV multiplexing method of the present embodiment, the packet input unit 11 first inputs packets of a plurality of layers before the change before the instruction to change the layer is instructed (step S1).

The layer distribution unit 12 distributes the packet input from the packet input unit 11 to a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change (step S2).

The TLV packet generation unit 14 reads a packet from a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer and generates a TLV packet (step S3).

When there is an instruction to change the hierarchy by the IF_IN hierarchy setting message, the hierarchy distribution unit 12 distributes the packet input from the packet input unit 11 to the temporary buffer 13 (step S4).

On the other hand, the TLV packet generation unit 14 reads a packet from a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer and generates a TLV packet even if the IF_IN layer setting message gives an instruction to change the layer. (Step S5).

Then, the TLV packet generation unit 14 reads the packets distributed to the temporary buffer 13 and generates a TLV packet after all the plurality of buffers 131 to 13N corresponding to the layer before the change are emptied (step S6). ).

After that, the packet input unit 11 inputs the packets of a plurality of layers after the change according to the layer after the change, and the layer distribution unit 12 corresponds to the packets input from the packet input unit 11 to the plurality of layers after the change. Allocate to a plurality of buffers 131 to 13N. Further, the TLV packet generation unit 14 reads and multiplexes the packets distributed to the changed layer from the plurality of buffers 131 to 13N after the reading of the packets distributed to the temporary buffer 13 is completed.

As described above, according to the present embodiment, when there is an instruction to change the hierarchy setting, the packet input from the packet input unit is distributed to the temporary buffer, and the plurality of buffers corresponding to the hierarchy before the change are all emptied. Read the packet until it is empty, and then read the packet from the temporary buffer.

With this configuration, even if an instruction to change the setting not to use the layer B is input at the timing when the reading is completed without reading the packet 206 from the buffer corresponding to the layer B as shown in FIG. 2, the packet 206 is output. It is read, and then packets 207 and subsequent packets are read. Therefore, it is possible to prevent the end of the content from being omitted when the hierarchy setting is changed.

Next, the second embodiment will be described. FIG. 4 is a block diagram showing an example of the configuration of the second embodiment. As shown in FIG. 4, unlike the first embodiment, the TLV packet multiplexing device 2 of the second embodiment has either the packet input unit 11 or the temporary buffer 13 as the input of the packet to the hierarchical distribution unit 22. It has a selection unit 21 for selecting a packet. Further, unlike the first embodiment, the TLV packet multiplexing device 2 has a layer change detection unit 23 that detects a layer change instruction and a layer change by a TMCC information setting message.

Next, the operation of this embodiment will be described. FIG. 5 is a flowchart showing the operation of the second embodiment. As shown in FIG. 5, in the TLV multiplexing method of the present embodiment, the selection unit 21 first selects the packet input unit 11 as the packet input to the layer distribution unit 22 before the layer change is instructed. , Packets of a plurality of layers before the change input by the packet input unit 11 are input to the layer distribution unit 22 (step S21).

Similar to the first embodiment, the layer distribution unit 12 distributes the packet input from the packet input unit 11 to a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change (step S2).

Similar to the first embodiment, the TLV packet generation unit 24 reads packets from the plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer and generates a TLV packet (step S3).

When there is a hierarchy change instruction by the IF_IN hierarchy setting message, the hierarchy change detection unit 23 detects the layer change (step S22), and the layer distribution unit 12 is input from the packet input unit 11 as in the first embodiment. Packets are distributed to the temporary buffer 13 (step S4).

On the other hand, as in the first embodiment, the TLV packet generation unit 24 reads a packet from the plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer even if there is an instruction to change the layer, and the TLV packet generation unit 24 reads the packet. Generate a packet (step S5).

Then, when the selection unit 21 detects that the plurality of buffers 131 to 13N corresponding to the plurality of layers before the change are all empty (step S23), the selection unit 21 temporarily inputs the packet to the layer distribution unit 22. Select buffer 13 (step S24). The layer distribution unit 22 distributes the packets distributed to the temporary buffer 13 based on the changed layer (step S25).

When the hierarchy is changed by the TMCC setting message, the hierarchy change detection unit 23 detects the hierarchy change (step S26), and the TLV packet generation unit 24 is distributed to the temporary buffer 13 as in the first embodiment. The packet is read and a TLV packet is generated (step S6).

When the layer is changed, the selection unit 21 selects the packet input unit 11 as the input of the packet to the layer distribution unit 22. The layer distribution unit 22 distributes the packet input from the packet input unit 11 to a plurality of buffers 131 to 13N corresponding to the plurality of changed layers (step S28).

When the TLV packet generation unit 14 completes reading the packets distributed to the temporary buffer 13 (step S29), the TLV packet generation unit 14 reads the packets from the plurality of buffers 131 to the buffer 13N corresponding to the plurality of layers after the layer change, and TLV. Generate a packet (step S30).

Also in the second embodiment described above, as in the first embodiment, when there is an instruction to change the layer setting, the packet input from the packet input unit is distributed to the temporary buffer, and the layer before the change is supported. Read the packet until all the buffers are empty, and then read the packet from the temporary buffer. Therefore, even in this embodiment, even when an instruction to change the setting so as not to use the layer B is input at the timing when the reading is completed without reading the packet 206 from the buffer corresponding to the layer B as shown in FIG. Packet 206 is read, and then packets 207 and subsequent packets are read. Therefore, it is possible to prevent the end of the content from being omitted when the hierarchy setting is changed. Can be done.

Next, a third embodiment will be described. FIG. 6 is a block diagram showing an example of the configuration of the third embodiment. As shown in FIG. 6, the TLV packet multiplexing device 3 of the third embodiment is different from the first embodiment and the second embodiment, and has a plurality of buffers 131 as input of packets to the TLV packet generation unit 34. -Has a selection unit 31 for selecting one of the buffer 13N and the temporary buffer 33. Further, the temporary buffer 33 includes a plurality of areas 331 to 33N corresponding to a plurality of layers, and the layer distribution unit 32 is a packet input from the packet input unit 11 when a layer change instruction is given by the IF_IN layer setting telegram. Is allocated to a plurality of areas 331 to 33N corresponding to the plurality of layers after the change.

Next, the operation of this embodiment will be described. FIG. 7 is a flowchart showing the operation of the third embodiment. As shown in FIG. 7, in the TLV multiplexing method of the present embodiment, before the change of the hierarchy is first instructed, as in the first embodiment, the plurality of layers before the change input by the packet input unit 11 The packet is input to the hierarchical distribution unit 32. Similar to the first embodiment, the layer distribution unit 32 distributes the packet input from the packet input unit 11 to a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change (step S2).

The selection unit 31 sequentially selects a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer as the input of the packet to the TLV packet generation unit 34 (step S31). Then, as in the first and second embodiments, the TLV packet generation unit 34 reads packets from the plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer and generates a TLV packet (step S3). ).

When there is a hierarchy change instruction by the IF_IN hierarchy setting message, the hierarchy change detection unit 35 detects the hierarchy change instruction (step S32), and the hierarchy distribution unit 32 inputs the packet input from the packet input unit 11 to the temporary buffer 33. Allocate to a plurality of regions 331 to 33N corresponding to the plurality of layers after the change (step S33).

On the other hand, the selection unit 31 sequentially selects a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change of the layer as the input of the packet to the TLV packet generation unit 34 (step S31). Similar to the first and second embodiments, the TLV packet generation unit 34 reads packets from the plurality of buffers 131 to 13N corresponding to the plurality of layers before the layer change even if there is an instruction to change the layer. Generate a TLV packet (step S5).

When the hierarchy is changed by the TMCC setting message, the hierarchy change detection unit 35 detects the hierarchy change (step S35), and the selection unit 31 has a plurality of buffers 131 to 13N corresponding to the plurality of layers before the change. When it is detected that all the packets are empty (step S36), the temporary buffer 33 is selected as the input of the packet to the TLV packet generation unit 34 (step S37). The TLV packet generation unit 34 reads the packets distributed to the temporary buffer 33 and generates a TLV packet (step S6).

When the layer is changed by the TMCC layer setting message, the layer distribution unit 32 distributes the packet input from the packet input unit 11 to a plurality of buffers 131 to 13N corresponding to the changed plurality of layers ( Step S38). When the reading of the packets distributed to the temporary buffer 13 is completed (step S39), the selection unit 31 inputs a plurality of buffers 131 to buffers 13N corresponding to a plurality of layers as input of the packet to the TLV packet generation unit 34. Select sequentially (step S40). The TLV packet generation unit 34 reads packets from the plurality of buffers 131 to 13N corresponding to the plurality of layers after the layer change to generate a TLV packet (step S41).

Also in the third embodiment described above, when there is an instruction to change the layer setting, the packet input from the packet input unit is distributed to the temporary buffer and the layer before the change is given, as in the first and second embodiments. Reads the packet until all the corresponding buffers are empty, and then reads the packet from the temporary buffer. Therefore, even in this embodiment, even when an instruction to change the setting so as not to use the layer B is input at the timing when the reading is completed without reading the packet 206 from the buffer corresponding to the layer B as shown in FIG. Packet 206 is read, and then packets 207 and subsequent packets are read. Therefore, it is possible to prevent the end of the content from being omitted when the hierarchy setting is changed.

Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various modifications that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the present invention.

1, 2, 3 TLV packet multiplexing device 11 Packet input section 12, 22, 32 Hierarchical distribution section 13, 33 Temporary buffer 131, 13N buffer 14, 24, 34 TLV packet generator section 21, 31 Selection section 23, 35 Hierarchical change Detection unit 331, 33N area

Claims (10)

A packet input unit that inputs packets of multiple layers, and
A plurality of buffers corresponding to the plurality of layers and
When there is an instruction to change the hierarchy, a temporary buffer that temporarily stores the packet and
A hierarchical distribution unit that distributes the packet to the plurality of buffers based on the layer and distributes the packet to the temporary buffer when there is an instruction to change the layer.
A TLV packet that reads the packet from the plurality of buffers when there is an instruction to change the layer, reads the packet allocated to the temporary buffer after the plurality of buffers are all empty, and generates a TLV packet. With the generator
Multiplexing device with. The layer distribution unit reads the packet from the temporary buffer and distributes the packet to the changed layer.
The multiplexing device according to claim 1, wherein the TLV packet generation unit reads the packet read from the temporary buffer and distributed to the changed layer after all the plurality of buffers are empty. The multiplexing device according to claim 2, wherein the layer distribution unit reads the packet from the temporary buffer and distributes the packet to the changed layer after the layer is changed. The TLV packet generation unit reads the packet distributed to the changed layer from the plurality of buffers after the layer is changed and the reading of the packet from the temporary buffer is completed. The multiplexing device described. The multiplexing according to claim 2 or 3, wherein the layer distribution unit distributes the packet input from the packet input unit to the plurality of buffers corresponding to the changed layer after the layer is changed. Device. The multiplexing device according to any one of claims 1 to 5, further comprising a selection unit for selecting either the packet input unit or the temporary buffer as the input of the packet to the hierarchical distribution unit. The multiplexing device according to any one of claims 1 to 5, further comprising a selection unit for selecting one of the plurality of buffers and the temporary buffer as an input of the packet to the TLV packet generation unit. The multiplexing device according to any one of claims 1 to 7, further comprising a layer change detection unit that detects the layer change instruction. Enter packets of multiple layers and
The packet is distributed to a plurality of buffers corresponding to the plurality of layers, and the packet is distributed to a plurality of buffers.
When there is an instruction to change the hierarchy, the packet is distributed to the temporary buffer,
When there is an instruction to change the hierarchy, the packet is read from the plurality of buffers,
After all the plurality of buffers are emptied, the packet allocated to the temporary buffer is read to generate a TLV packet.
Multiplexing method. Computer,
Packet input section for inputting packets of multiple layers,
Multiple buffers corresponding to the multiple layers,
A temporary buffer that temporarily stores the packet when there is an instruction to change the layer.
A layer distribution unit that distributes the packet to the plurality of buffers based on the layer, and distributes the packet to the temporary buffer when there is an instruction to change the layer, and a layer distribution unit.
A TLV packet that reads the packet from the plurality of buffers when there is an instruction to change the layer, reads the packet allocated to the temporary buffer after the plurality of buffers are all empty, and generates a TLV packet. Generator,
A program that functions as.

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