JP2002185942A - Video sending server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video sending server capable of sending high-band video data with correct frame timing to an IP network. SOLUTION: The server is provided with a video data reading control part 1102 for reading video data based on the timing of a video frame, an adding part 1106 for completing a UD packet when transferring the video data to a packet buffer part 1104 without performing protocol control by software, a packet sending control part 1105 for sending a packet by independent control in accordance with the completed number of packets by a part 1104 and a video data buffer part 1103 for realizing temporary saving of the video data for improving the reading efficiency of the video data to send the high-band video data with correct frame timing to the IP network.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video transmission server for packetizing and transmitting high-bandwidth video data to an IP network.

[0002]

2. Description of the Related Art The configuration of a conventional video transmission server is shown in FIG.

[0005] As shown in FIG.
0 indicates a video storage unit 5101, a video data read control unit 5102, a packet buffer unit 5104, a protocol software control unit 5105, a timing notification unit 5107, a network interface unit 5108, and TCP / IP.
The core network 5 including the application 5109
200.

[0004] The protocol software control unit 5105 includes a CP
It is composed of a U system and control software, and receives a notification at a certain interval from the timing notification unit 5107,
The video data is stored in the video storage unit 51 at a speed corresponding to the video rate.
01 to the packet buffer unit 5104 each time, an instruction is sent to the video data read control unit 5102, the header information is added by protocol processing, and the IP packet containing the video data is added to the packet buffer unit 51.
When it is completed in 04, it is configured to issue a transmission instruction to the network interface unit 5108.

[0005] Further, the TC executed in parallel with the video transmission.
The P / IP application 5109 transmits the TCP /
It is configured to exchange TCP / IP packet data with the protocol software control unit 5105 every time an IP packet is transmitted / received.

[0006]

However, in such a conventional video transmission server, the generation of a packet including video data is performed by a protocol software control unit comprising a CPU system and control software.
Since the basic clock timing referred to by the system is not always the least common multiple of the display interval of video frames, there is a problem that rounding errors occur due to count-up and packets cannot always be transmitted at a timing accurate to the video rate. Was.

Further, there is a problem that packets cannot always be transmitted at an accurate timing with respect to the video rate due to the overhead of the basic software in the control software, and that processing cannot be performed if a large amount of video data is transmitted. Was.

Further, since the reading of the video data from the video storage unit becomes small depending on the packet size, there is a problem that the reading efficiency is reduced and it becomes difficult to read a large amount of video data.

Further, TCP / IP accompanying video transmission
When the applications are executed in parallel, there is a problem that the video load cannot be kept at a constant interval due to the processing load.

The present invention has been made in order to solve such a conventional problem, and provides a video transmission server capable of packetizing and transmitting a large amount of video data to an IP network at a more accurate frame rate. Is what you do.

[0011]

A video transmission server according to the present invention is a video transmission server for packetizing and transmitting video data to an IP network, and generates and notifies notification information at a frame display interval of a video frame. A frame timing notification unit, a video storage unit that stores video data,
A packet buffer for temporarily saving the video data as UDP / IP packet data; and a video buffer storing the video data stored in the video storage at the timing notified by the frame timing notification unit. A video data read control unit that reads data at a speed corresponding to the rate; a CPU system and control software; each time the video data is read, a read completion notification is received from the video read control unit; A protocol software control unit for generating header information of the packet to complete the UDP / IP packet; and receiving an instruction from the protocol software control unit and receiving the UD from the packet buffer unit.
It has a configuration characterized by including a network interface unit for sending a P / IP packet to an IP network.

With this configuration, the frame timing notifying section generates timing at the frame display interval of the video frame, and at this timing, the video data reading control section transmits the video data from the video storage section storing video data to the UDP / UDP. The packet data is read out to the packet buffer unit as IP packet data, and the protocol software control unit receives a read completion notification every time the video data is read out,
Since the UDP / IP packet is completed by generating the header information of the IP packet and the transmission of the UDP / IP packet is instructed to the network interface unit, the video data can be read out accurately based on the timing of the video frame. Become.

A video transmission server according to the present invention is a video transmission server for packetizing video data to an IP network and transmitting the packetized data, and a frame timing notification unit for generating and notifying notification information at a frame display interval of a video frame. A video storage unit that stores video data; a packet buffer unit that temporarily saves the video data as UDP / IP packet data; and a video buffer that stores the video data in the video storage unit at the timing notified by the frame timing notification unit. A video data read control unit for reading the stored video data into the packet buffer unit at a speed corresponding to a video rate; and each time the video data is read from the video storage unit to the packet buffer unit, the UDP / I
A packet header adding unit for generating header information of the P packet, adding the header information to the video data to complete a UDP / IP packet, and temporarily saving the UDP / IP packet in the packet buffer unit; Receiving a notification of the timing at the display interval of the video frame from the frame timing notifying unit, and receiving the notification of the U at every display interval notification of the video frame a predetermined number of times.
A packet transmission control unit that evaluates the number of completed DP / IP packets and, when it is confirmed that a number of packets larger than the video display rate has been completed, outputs a transmission instruction of the UDP / IP packets for the number of packets. And a network interface unit for transmitting the UDP / IP packet from the packet buffer unit to the IP network in response to a transmission instruction from the packet transmission control unit.

With this configuration, each time the video data is sent from the video storage unit to the packet buffer unit, the packet header adding unit generates the UDP / IP packet header information to complete the UDP / IP packet. Receiving a notification of the number of completed UDP / IP packets, a timing notification at a display interval of the video frame, and receiving a notification of the display interval of the video frame a predetermined number of times. Since the number of completed UDP / IP packets is evaluated and the transmission of the UDP / IP packets is instructed to the network interface unit, the
It is possible to generate a UDP packet without including the execution of the processing including the U system and the control software, and it is possible to generate a large amount of packets at accurate timing.

Further, the video transmission server of the present invention comprises a CPU for executing an application on TCP / IP which operates in parallel with the transmission of the UDP / IP packet composed of the video data, and control software. Only when the control unit does not transmit the UDP / IP packet, a TCP / IP application unit instructing the network interface unit to transmit the TCP / IP packet is provided.

According to this configuration, the TCP / IP application unit transmits the UDP / IP from the packet transmission control unit.
After receiving the notification of the timing when the packet is not transmitted,
Since the transmission of the TCP / IP packet is instructed to the network interface unit only when the UDP / IP packet is not transmitted from the packet transmission control unit, even if the TCP / IP application accompanying the video transmission is executed in parallel. In addition, it is possible to avoid affecting the timing of video transmission.

The video transmission server of the present invention reads the video data from the video storage unit, temporarily buffers the video data, and stores the video data buffered at a speed corresponding to the video rate in the packet buffer unit. It has a configuration characterized by including a video data buffer unit for transferring.

With this configuration, the video data buffer unit reads out the video data from the video storage unit in a large amount at a time, temporarily buffers the video data, and transfers the video data to the packet buffer unit in accordance with the video rate. Since the data is transferred at a high speed, the read efficiency of the video data can be improved, and a large amount of video data can be easily read.

Further, the video transmission server of the present invention sets the compression format of the video data stored in the video storage unit to the MPEG format, processes the video data read control unit, and transmits the packet from the packet buffer unit. The control timing in the processing has a configuration characterized by counting the number of frames that are multiples of the GOP in the MEPG format, and setting the control timing as a processing break.

With this configuration, even when the MPEG system using the frame correlation is used as the video data compression system,
The desired video transmission server can be realized.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a video sending server according to the first embodiment of the present invention.

As shown in FIG. 1, the video transmission server 210
0 indicates a video storage unit 2101, a video data read control unit 2102, a packet buffer unit 2104, a protocol software control unit 2105, a frame timing notification unit 210
7. It has a network interface unit 2108 and is connected to the backbone network 2200.

Video sending server 21 in the present embodiment
00 is connected so that the video data read control unit 2102 notifies the video data from the frame timing notification unit 2107 that generates timing at the frame display interval of the video frame, and transmits the video data from the video storage unit 2101 that stores the video data to the UDP / UDP. Control is performed to read the packet data into the packet buffer unit 2104 temporarily saved as IP packet data at a speed corresponding to the video rate.

Further, a protocol software control unit 2105
Is composed of a CPU system and control software, receives read completion each time video data is read from the video read control unit 2102, generates header information of a UDP / IP packet in the packet buffer unit 2104, and outputs
/ IP packet is completed, and the network interface unit 2108 is instructed to transmit the UDP / IP packet.

According to the first embodiment of the present invention, it is possible to read out video data accurately based on the timing of a video frame.

Next, FIG. 2 shows a video transmission server according to a second embodiment of the present invention.

As shown in FIG. 2, the video transmission server 310
0 includes a video storage unit 3101, a video data read control unit 3102, a packet buffer unit 3104, a packet transmission control unit 3105, a packet header addition unit 3106, a frame timing notification unit 3107, and a network interface unit 3108.
Connected to 0.

The video transmission server 31 in the present embodiment
00 has a packet transmission control unit 3105 and a packet header addition unit 3106 instead of the protocol software control unit 2105 in the video transmission server 2100 of the first embodiment.
Indicates that the video storage unit 3101 sends the packet buffer unit 310
Every time the video data is transmitted to the video storage unit 31
01, generates header information of a UDP / IP packet, adds the header information to the video data, and generates a UDP / IP packet.
Control is performed to temporarily save the packet in the packet buffer unit 3104 while completing the packet.

Further, the packet transmission control unit 3105
Connected to the packet buffer unit 3104 and
A notification of the number of completed IP packets is received, and further a timing notification is received at a display interval of video frames connected to a frame timing notifying unit 3107.
The number of completed DP / IP packets is evaluated, and when it is confirmed that the number of completed packets is larger than the video display rate, the network interface unit 3108 is instructed to transmit the UDP / IP packets corresponding to the number.

According to such a second embodiment of the present invention, UDP packets can be generated without including the execution of processing consisting of a CPU system and control software, and a large number of packets are generated at accurate timing. be able to.

Next, a video sending server according to a third embodiment of the present invention is shown in FIG.

[0033] As shown in FIG.
0 indicates a video storage unit 1101, a video data read control unit 1102, a video data buffer unit 1103, a packet buffer unit 1104, a packet transmission control unit 1105, a packet header addition unit 1106, a frame timing notification unit 1107, and a network interface unit 1108.
And is connected to the backbone network 1200.

Video transmission server 11 in the present embodiment
A function 00 is to provide a video data buffer unit 1103 between the video storage unit 1101 and the packet buffer unit 1104, and to temporarily buffer the video data from the video storage unit 1101 so that a large amount of video data can be read at one time. When transferring video data to the packet buffer unit 1104, it is possible to transfer the video data at a speed corresponding to the video rate.

According to the third embodiment of the present invention, the read efficiency of video data can be improved, and a large amount of video data can be easily read.

Next, a video sending server according to a fourth embodiment of the present invention is shown in FIG.

As shown in FIG. 4, the video transmission server 410
0 indicates a video storage unit 4101, a video data read control unit 4102, a video data buffer unit 4103, a packet buffer unit 4104, a packet transmission control unit 4105, a packet header addition unit 4106, a frame timing notification unit 4107, a network interface unit 4108, and TCP. / IP application unit 4109, and is connected to the backbone network 4200.

The video transmission server 41 in the present embodiment
00 indicates that the TCP / IP application unit 4109
It is composed of a CPU that executes an application on TCP / IP that operates in parallel with the transmission of the UDP / IP packet consisting of the video data, and control software.
Upon receiving the notification of the timing at which the P / IP packet is not transmitted, it instructs the network interface unit 4108 to transmit the TCP / IP packet only at that time.

According to the fourth embodiment of the present invention, even if the TCP / IP application accompanying the video transmission is executed in parallel, it is possible to avoid affecting the video transmission timing.

[0040]

As described above, according to the present invention, the frame timing notifying section generates timing at the frame display interval of the video frame, and at this timing, the video data read control section causes the video storage section to store the video data. Unit reads the video data as UDP / IP packet data to the packet buffer unit, receives a read completion notification every time the video data is read, generates header information of the UDP / IP packet, and
A video transmission server having an excellent effect that by completing a DP / IP packet and instructing the network interface unit to transmit the UDP / IP packet, it is possible to read out video data accurately based on the timing of a video frame. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a video sending server according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a video transmission server according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a video transmission server according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a video transmission server according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional video transmission server.

[Explanation of symbols]

 1100 Video transmission server 1101 Video storage unit 1102 Video data read control unit 1103 Video data buffer unit 1104 Packet buffer unit 1105 Packet transmission control unit 1106 Packet header addition unit 1107 Frame timing notification unit 1108 Network interface unit 1200 Core network 2100 Video transmission server 2101 Video storage unit 2102 Video data read control unit 2104 Packet buffer unit 2105 Protocol software control unit 2107 Frame timing notification unit 2108 Network interface unit 2200 Backbone network 3100 Video transmission server 3101 Video storage unit 3102 Video data read control unit 3104 Packet buffer unit 3105 packet Transmission control unit 3106 packets Data addition unit 3107 frame timing notification unit 3108 network interface unit 3200 backbone network 4100 video transmission server 4101 video storage unit 4102 video data read control unit 4103 video data buffer unit 4104 packet buffer unit 4105 packet transmission control unit 4106 packet header addition unit 4107 frame Timing notification unit 4108 Network interface unit 4109 TCP / IP application unit 4200 Backbone network 5100 Video transmission server 5101 Video storage unit 5102 Video data read control unit 5104 Packet buffer unit 5105 Protocol software control unit 5107 Timing notification unit 5108 Network interface unit 5109 TCP / IP application 5 200 backbone network

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sumio Yokomitsu 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. No.3-1, Matsushita Communication Industrial Co., Ltd. F-term (reference) 5C053 GA11 GB37 KA03 LA15 5C064 BB05 BC16 BD08 5K030 HB02 JA05 KA03

Claims (5)

[Claims] 1. A video transmission server for packetizing video data to an IP network and transmitting the packetized video data, comprising: a frame timing notification unit for generating and notifying notification information at a frame display interval of a video frame; A storage unit; a packet buffer unit for temporarily saving the video data as UDP / IP packet data; and a packet buffer for storing the video data stored in the video storage unit at the timing notified by the frame timing notification unit. A video data read control unit for reading at a speed corresponding to a video rate; a CPU system and control software; each time the video data is read, a read completion notification is received from the video read control unit, In the header information of the UDP / IP packet To generate a UDP
/ A protocol software control unit for completing an / IP packet, and a network interface unit receiving an instruction from the protocol software control unit and transmitting the UDP / IP packet from the packet buffer unit to an IP network. Outgoing server. 2. A video transmission server for packetizing video data and transmitting the video data to an IP network, comprising: a frame timing notification unit for generating and notifying notification information at a frame display interval of a video frame; A storage unit; a packet buffer unit for temporarily saving the video data as UDP / IP packet data; and a packet buffer for storing the video data stored in the video storage unit at the timing notified by the frame timing notification unit. A video data read control unit that reads out data at a speed corresponding to a video rate, and generates header information of the UDP / IP packet every time video data is read from the video storage unit to the packet buffer unit. Add UD to video data
A packet header adding unit that completes a P / IP packet and temporarily saves the packet in the packet buffer unit; receives a notification of the number of completed UDP / IP packets; Is received, and the UDP / I is transmitted every time the display interval of the video frame is displayed a predetermined number of times.
A packet transmission control unit that evaluates the number of completed P packets and, when it is confirmed that a number of packets greater than the video display rate has been completed, outputs a transmission instruction of the UDP / IP packets for the number of packets; According to the transmission instruction from the packet transmission control unit, the UDP / IP packet is
A video transmission server comprising a network interface unit for transmitting to a network. 3. A packet transmission control unit comprising: a CPU for executing an application on TCP / IP operating in parallel with the transmission of the UDP / IP packet comprising the video data; TCP that instructs the network interface unit to transmit a TCP / IP packet only when is not transmitted
3. The video transmission server according to claim 2, further comprising a / IP application unit. 4. A video data buffer unit for reading the video data from the video storage unit, temporarily buffering the video data, and transferring the buffered video data at a speed corresponding to the video rate to the packet buffer unit. The video transmission server according to any one of claims 1 to 3, wherein: 5. The compression format of video data stored in the video storage unit is MPEG format, and the control timing in the process in the video data read control unit and the process in which the packet is transmitted from the packet buffer unit is defined in the MPEG format. The video transmission server according to any one of claims 1 to 4, wherein the number of frames, which is a multiple of the GOP, is counted as a processing break.