JP3733299B2 - Transmitting apparatus and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission apparatus and a program using a network such as IEEE1394 suitable for real-time transmission, for example.
[0002]
[Prior art]
With the improvement of LSI technology, networks that digitize and transmit video information and audio information are being developed. Since video signals and audio signals need to be reproduced in real time, a network capable of real time transmission is required.
[0003]
As a network suitable for such real-time transmission, there is a network called IEEE1394. IEEE 1394 is a serial high-speed bus system and can transmit data synchronously, so that real-time transmission is possible.
[0004]
IEEE 1394 is installed in many AV devices as an external interface, including Set Top Box (hereinafter referred to as STB) that receives MPEG2 data from a home digital VCR (hereinafter referred to as DV), D-VHS, satellite broadcasting, etc. be able to. By using IEEE1394, real-time data transmission between AV devices can be performed. IEC61883 has been established as a standard for transmitting AV data such as DV and MPEG2 using IEEE1394.
[0005]
In IEC61883, transmission between AV devices is represented by the concept of input / output plugs. Each AV device has zero or one or more virtual input plugs and output plugs, and each AV device has a virtual connection between these plugs before actually transmitting the stream. It is defined that the stream transmission is performed between the connected output plug and the input plug after the connection is established.
[0006]
As a command set for controlling these AV devices, “AV / C Digital Interface Command Set” is standardized in IEEE 1394 Trade Association. In “AV / C Digital Interface Command Set”, in order to be able to adjust input / output plugs when a plurality of AV devices are connected to the same bus and a plurality of streams are transmitted simultaneously, the “AV / C Digital Interface Command Set” The AV / C Connection and Compatibility Management Specification is defined. Here, an AV device compliant with the “AV / C Connection and Compatibility Management Specification” standard is referred to as a CCM-compatible device.
[0007]
On the other hand, even in personal computers (hereinafter referred to as PC), IEEE 1394 is officially supported by the standard OS such as Windows 98 of Microsoft Corporation, so that IEEE 1394 is rapidly spreading in the PC world. Along with the dramatic improvement in CPU performance, AV data is also transmitted on PCs.
[0008]
Now, plugs and connections in IEC61883 will be described with reference to FIGS.
[0009]
FIG. 1 is a conceptual diagram of plugs and connections in IEC61883. In FIG. 1, 101, 102 and 103 are AV devices, 104 is an IEEE 1394 bus, 105a, 105b and 105c are input plugs, and 106a, 106b, 106c and 106d are output plugs.
[0010]
FIG. 2 is an explanatory diagram of an example of an overlay in IEC61883. In FIG. 2, 201a, 201b and 201c are AV devices, 202a, 202b and 202c are output plugs, and 203a, 203b and 203c are input plugs.
[0011]
FIG. 3 is an explanatory diagram of an example of a connection (connection method) in a CCM-compatible device. In FIG. 3, 301, 302 and 303 are AV devices, 304a, 304b, 304c and 304d are output plugs, and 305d and 305e are input plugs. Here, it is assumed that the AV device 302 is a CCM compatible device.
[0012]
IEC61883 defines the concept of a plug that represents a logical connection between AV devices. A plug that outputs a stream to the IEEE 1394 bus is called an output plug, and a plug that inputs a stream from the IEEE 1394 bus is called an input plug. As a logical concept, the stream is transmitted from the output plug of the output AV device to the input plug of the input AV device through the IEEE 1394 bus.
[0013]
Each AV device can have a plurality of plugs, and can also have only input plugs or only output plugs. For example, the AV device 101 in FIG. 1 has two input plugs, and the AV device 102 has one input plug and one output plug. Also, the AV device 103 has three output plugs.
[0014]
Each device needs to make a logical connection when transmitting a stream. There are two types of connections: a broadcast connection in which no partner is specified, and a point-to-point connection (hereinafter referred to as p2p connection) in which a pair of output plugs and input plugs are specified. One-to-many transmission can be performed simultaneously by performing p2p connection for designating a plurality of input plugs for one output plug.
[0015]
For example, in FIG. 1, the output plug 106 a of the AV device 102 and the input plug 105 b of the AV device 101 perform p2p connection using channel 0. In addition, the output plug 106b of the AV device 103 and the input plug 105b of the AV device 101, and the output plug 106b of the AV device 103 and the input plug 105c of the AV device 102 are in p2p connection.
[0016]
Now, p2p connection is further made to the original p2p connection output plug (for example, when the output plug 202a of the AV device 201a and the input plug 203b of the AV device 201b are p2p connected in FIG. (The p2p connection between the output plug 202a of the device 201a and the input plug 203c of the AV device 201c) is called overlay.
[0017]
Some AV devices automatically perform p2p connection to a designated AV device when data input is set to be performed from IEEE1394.
[0018]
If the output AV device has only one output plug, it is OK to connect only one output plug, but if the output AV device has a plurality of output plugs, which It is necessary to manage whether to connect to the output plug.
[0019]
For such a case, the aforementioned “AV / C Connection and Compatibility Management Specification” standard has been established.
[0020]
For example, when an INPUT SELECT command is issued to a receiving device, an instruction can be given to make a p2p connection between a specified output plug and a specified input plug. In this case, it is possible to instruct to make a connection immediately when a command is received, and it is also possible to specify the output plug of the other party when the receiving device makes a p2p connection after receiving the command. It is.
[0021]
More specifically, for example, in FIG. 3, the p2p connection is first performed between the output plug 304c of the AV device 301 and the input plug 305e of the AV device 303. At this time, when the AV device 301 issues an INPUT SELECT command to the AV device 302 so as to make a p2p connection between its own output plug 304b and the input plug 305d of the AV device 302, the AV device 302 A p2p connection is made between the plug 305d and the output plug 304b. As a result, the AV device 301 can connect the output plug to which the AV device 301 intends to output a stream for the AV device 302 and the input plug of the AV device 302.
[0022]
[Problems to be solved by the invention]
However, at present, CCM-compatible devices are not widely used, and it is often impossible to specify to which output plug of a transmitting device a receiving device is connected. That is, as described above, some AV devices have a p2p connection to a specific output plug (usually # 0).
[0023]
For example, the AV device 401 in FIG. 4 is an example of such an AV device. FIG. 4 is an explanatory diagram of an example of a connection (connection method) in a non-CCM compatible device, where 401 is an AV device, 402a is an output plug, and 403a is an input plug.
[0024]
When the AV device 401 is set as an input from the AV device 301 through the IEEE 1394, the p2p connection with the output plug 304a is always performed. Even if the AV device 301 has already made a p2p connection between the output plug 304a and the input plug 305e of the AV device 303, the AV device 401 performs overlay on the output plug 304a.
[0025]
Then, the AV device 301 cannot transmit a stream different from the stream transmitted to the AV device 303 to the AV device 401.
[0026]
Thus, even if the transmitting device is a CCM compatible device, if the receiving device is a non-CCM compatible device, there is a possibility that a plurality of streams cannot be transmitted simultaneously.
[0027]
In view of the above-described conventional problems, an object of the present invention is to provide a transmission apparatus and a program that can simultaneously transmit a plurality of streams even when a receiving device includes a device that does not support CCM. It is.
[0028]
[Means for Solving the Problems]
A first aspect of the present invention (corresponding to claim 1) is a plurality of output plugs for outputting data to a receiving device via a transmission bus;
When the receiving device receives the output data, it issues a command to the receiving device to check whether or not the output plug can output the data. Command issuing means;
An output plug determining means for determining the output plug to which the data is to be output based on the result of the examination.
[0029]
According to a second aspect of the present invention (corresponding to claim 2), at least one of the plurality of output plugs outputs from which output plug the data is output when the output data is received. This is a dedicated output plug for devices that cannot be specified.
As a result of the examination, when it is determined that the receiving device can specify from which output plug the data is output when receiving the output data, the data is output. The power output plug is the transmission device according to the first aspect of the present invention, wherein the output plug is determined as an output plug other than the dedicated output plug among the plurality of output plugs.
[0030]
A third aspect of the present invention (corresponding to claim 3) is an apparatus that can specify from which output plug the data is output when the receiving apparatus receives the output data as a result of the examination. When it is determined that there is a transmission device according to the second aspect of the present invention, the determination of the output plug is performed on the transmission device side and notified to the reception device side.
[0031]
According to a fourth aspect of the present invention (corresponding to claim 4), the output plug determining means includes a plug management unit for managing the usage status of the plurality of output plugs, and an application for outputting data to the receiving device. Have
The instruction for issuing the command to the receiving device is the transmitting device according to the third aspect of the present invention, which is performed by the application.
[0032]
In a fifth aspect of the present invention (corresponding to claim 5), the application inquires the plug management unit for an output plug to which the data is to be output.
When the plug management unit accepts the inquiry and determines (1) the output plug to which the data is to be output, the plug management unit notifies the determined output plug to the application, and (2) If it cannot be determined, notify the application to that effect,
A connection for outputting data to the receiving device via the transmission bus is: After the determination of the output plug is notified to the receiving device side It is the transmitter of the 4th present invention performed.
[0033]
According to a sixth aspect of the present invention (corresponding to claim 6), the application inquires the usage status of the plurality of output plugs to the plug management unit,
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
Above application Receives the notification, determines an output plug to which the data is to be output, requests permission to use the determined output plug to the plug management unit,
A connection for outputting data to the receiving device via the transmission bus is: After the determination of the output plug is notified to the receiving device side It is the transmitter of the 4th present invention performed.
[0034]
According to a seventh aspect of the present invention (corresponding to claim 7), the application inquires the plug management unit for an output plug to which the data is to be output,
When the plug management unit accepts the inquiry and determines (1) the output plug to which the data is to be output, the plug management unit notifies the determined output plug to the application, and (2) If it cannot be determined, notify the application to that effect,
A connection for outputting data to the receiving device via the transmission bus is: By the start of the data output It is the transmitter of the 4th present invention performed.
[0035]
In an eighth aspect of the present invention (corresponding to claim 8), the application inquires the usage status of the plurality of output plugs to the plug management unit,
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
Above application Receives the notification, determines an output plug to which the data is to be output, requests permission to use the determined output plug to the plug management unit,
A connection for outputting data to the receiving device via the transmission bus is: By the start of the data output It is the transmitter of the 4th present invention performed.
[0036]
According to a ninth aspect of the present invention (corresponding to claim 9), the output plug determining means includes a plug management unit for managing the usage status of the plurality of output plugs, and an application for outputting data to the receiving device. Have
The instruction for issuing the command to the reception device is the transmission device according to the third aspect of the present invention, which is performed by the plug management unit.
[0037]
In a tenth aspect of the present invention (corresponding to claim 10), the application inquires the plug management unit about the usage status of the plurality of output plugs.
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
Above application Receives the notification, determines an output plug to which the data is to be output, requests permission to use the determined output plug to the plug management unit,
A connection for outputting data to the receiving device via the transmission bus is: After the determination of the output plug is notified to the receiving device side It is the transmitter of the 9th aspect of this invention performed.
[0038]
In an eleventh aspect of the present invention (corresponding to claim 11), the application inquires the plug management unit about the usage status of the plurality of output plugs.
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
Above application Receives the notification, determines an output plug to which the data is to be output, requests permission to use the determined output plug to the plug management unit,
A connection for outputting data to the receiving device via the transmission bus is: By the start of the data output It is the transmitter of the 9th aspect of this invention performed.
[0039]
According to a twelfth aspect of the present invention (corresponding to claim 12), there is provided a plurality of output plugs for outputting data to a receiving apparatus via a transmission bus of the transmitting apparatus of the first aspect of the present invention; Command issuing means for issuing a command to the receiving device to check whether or not the device can specify which output plug to output the data when receiving the output data; Output plug determining means for determining the output plug to which the data is to be output based on the result of the examination; Shi This is a program for making a computer function.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[0041]
(Embodiment 1)
First, the configuration and operation of the transmission apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS.
[0042]
FIG. 5 is an explanatory diagram of a transmission method performed between the transmission apparatus and the non-CCM compatible device in the present embodiment. In FIG. 5, 501 is an AV device, 502a and 502b are applications, 503 is a plug management unit, 504 is a command issuing unit, 505a, 505b and 505c are output plugs, 506 is a request, 507 is a response, 508 is a command, and 509 is Response 510 is transmission data.
[0043]
FIG. 6 is an explanatory diagram of a transmission method performed between the transmission apparatus and the CCM-compatible device in the present embodiment. In FIG. 6, reference numeral 601 denotes transmission data.
[0044]
FIG. 7 is an explanatory diagram of a simultaneous transmission method performed between the transmission apparatus and each of the CCM compatible device and the non-CCM compatible device in the present embodiment.
[0045]
5-7, an application 502a is an application that transmits data to the AV device 401 that is a CCM-incompatible device, and an application 502b is an application that transmits data to the AV device 302 that is a CCM-compatible device. Shall. Further, the output plug 505a is used only at the time of transmission performed with a device that does not support CCM.
[0046]
(1) First, a transmission method performed between a transmission device and a CCM non-compliant device will be described with reference to FIG. As an initial state, all output plugs are unused.
[0047]
First, the application 502 a transmits a command to the AV device 401 to confirm (examine) whether the CCM is compatible with the AV device 401 through the command issuing unit 504 as a command 508. For example, a command for inquiring whether the INPUT SELECT command is supported can be used as the command for confirming whether the CCM is supported.
[0048]
Since the AV device 401 does not support CCM, the response indicating that it is not supported is transmitted to the AV device 501 as a response 509.
[0049]
By looking at the response 509 received through the command issuing unit 504, the application 502a can know that the AV device 401 does not support CCM. Since the AV device 401 does not support CCM, the application 502a outputs the use permission of the output plug 505a that should be used only with the device not supporting CCM as described above to the plug management unit 503 as a request 506 ( If the output plug 505a is not usable, a notification to that effect is given). Since the requested output plug 505a is unused and can be used, the plug management unit 503 returns a permission to use the output plug 505a as a response 507 to the application 502a. When the application 502a receives permission to use the output plug 505a, the AV device 401 instructs the AV device 501 to receive data from IEEE 1394 as a command 508 through the command issuing unit 504. 401 is output.
[0050]
When the AV device 401 receives a command instructing data reception from the IEEE 1394, the AV device 401 establishes a p2p connection to the AV device 501. At this time, even if the AV device 401 is a device that always makes a p2p connection to a specific output plug (# 0) as described above, the AV device 401 can correctly make a p2p connection to the output plug 505a that is # 0. it can.
[0051]
Thus, the application 502a outputs the transmission data 510 through the output plug 505a.
[0052]
Then, the AV device 401 receives the transmission data 510 through the input plug 403a.
[0053]
Note that when the AV device 401 does not support a command for instructing the AV device 501 to receive data from IEEE 1394, or when it is supported, the AV device 501 does not necessarily support the AV device 501 when receiving a command. When the p2p connection is not performed, for example, the user may directly operate the AV device 401 to perform the p2p connection to the AV device 501.
[0054]
Therefore, when the AV device 401 is a device that does not support CCM, the timing for performing the p2p connection is not much different before or after the application 502a checks whether the AV device 401 is compatible with CCM.
[0055]
(2) Next, a transmission method performed between the transmission apparatus and the CCM-compatible device will be described with reference to FIG. As an initial state, all output plugs are unused.
[0056]
First, the application 502b transmits, to the AV device 302, as a command 508, a command for confirming whether the CCM is compatible with the AV device, through the command issuing unit 504. As a command for confirming whether or not CCM is supported, a command for inquiring whether or not the INPUT SELECT command is supported can be used.
[0057]
Since the AV device 302 is compatible with CCM, an answer indicating that it is compatible is transmitted as a response 509 to the AV device 501.
[0058]
By looking at the response 509 received through the command issuing unit 504, the application 502b can know that the AV device 302 is compatible with CCM. Since the AV device 302 is compatible with the CCM, the application 502b outputs the number of plugs that can be used other than the output plug 505a and the use permission to the plug management unit 503 as the request 506 (as described above, the output plug 505a is used only at the time of transmission to and from a non-CCM compatible device). Then, the plug management unit 503 returns a use permission of the output plug 505b which is a usable (unused) output plug as a response 507 to the application 502b. Also, when the application 502b receives permission to use the output plug 505b, the command issuing unit instructs the AV device 302 to make a p2p connection between the output plug 505b of the AV device 501 and the input plug 305d as a command 508. The data is output to the AV device 302 through 504.
[0059]
When the AV device 302 receives a command for instructing p2p connection, the AV device 302 performs p2p connection between the output plug 505b and the input plug 305d of the AV device 501.
[0060]
Thus, the application 502b outputs the transmission data 601 through the output plug 505b.
[0061]
Then, the AV device 302 receives the transmission data 601 through the input plug 305d.
[0062]
The timing at which the p2p connection between the output plug 505b and the input plug 305d is established is arbitrary. That is, before actual data transmission, the AV device 501 outputs a command for instructing to receive data from IEEE1394 to the AV device 302 as a command 508, or the user directly operates the AV device 302. You may set so that data may be received from IEEE1394. In short, it suffices if p2p connection is made between the AV device 501 and the AV device 302 before data transmission.
[0063]
In the above, (1) the transmission method performed between the transmission device and the CCM-incompatible device and (2) the transmission method performed between the transmission device and the CCM-compatible device have been described. When using a non-compliant device, always use output plug # 0. When the receiving device is a CCM compatible device, make sure to use an output plug other than output plug # 0 so that only transmission to the CCM compatible device is possible. It can be seen that the output plug # 0 is always usable even when Therefore, even when transmission to a CCM compatible device has already been performed, transmission to a CCM non-compatible device can be performed without any problem.
[0064]
That is, when these two processes (see FIGS. 5 to 6) are performed regardless of the order, a communication state as shown in FIG. 7 is obtained, and one CCM compatible device and one CCM non-transmission state are obtained. Data is simultaneously output to each compatible device.
[0065]
Of course, since the AV device 501 has a total of three output plugs, it is also possible to simultaneously output data to another AV device (in this case, it becomes a receiving device). The AV device must be a CCM compatible device).
[0066]
The first embodiment has been described in detail above.
[0067]
Note that, as a command for confirming whether or not CCM is supported, a command for inquiring whether or not the INPUT SELECT command is supported is used, but other commands may be used. In short, it is only necessary to confirm whether the target device is compatible with CCM.
[0068]
Further, although the AV device 501 has three output plugs, any number of output plugs may be provided as long as the number is two or more, and one or more input plugs are simultaneously provided. It doesn't matter.
[0069]
In addition, the AV device 302 and the AV device 401 both have one output plug and one input plug, but if they have at least one input plug, they have the output The number of plugs and input plugs does not matter.
[0070]
In addition, the application 502a or the application 502b outputs an inquiry about the usage status of the output plug as a request 506 to the plug management unit 503. The plug management unit 503 displays a list of available output plugs or usage statuses of all the output plugs. The response 507 may be returned to the application 502a or the application 502b. In this case, the application 502a or the application 502b can select an output plug to be used by referring to the received response 507. Thereafter, the application 502 a or the application 502 b outputs the use permission of the selected output plug as a request 506 to the plug management unit 503. If the specified output plug is usable, the plug management unit 503 returns a use permission for the specified output plug as a response 507 to the application 502a or the application 502b.
[0071]
In addition, although there are two applications, the application 502a and the application 502b, any number of applications may exist at the same time, and one application performs transmission between a plurality of AV devices. It doesn't matter.
[0072]
Further, a part or all of the AV device 501 may be configured by software.
[0073]
(Embodiment 2)
Next, the configuration and operation of the transmission apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS.
[0074]
FIG. 8 is an explanatory diagram of a transmission method performed between the transmission apparatus and the non-CCM compatible device in the present embodiment. In FIG. 8, 801 is an AV device, 802a and 802b are applications, 803 is a plug management unit, and 804 is transmission data. In this embodiment, unlike the case of the first embodiment described above, the plug management unit 803 is closer to the command issuing unit 504 than the applications 802a and 802b.
[0075]
FIG. 9 is an explanatory diagram of a transmission method performed between the transmission apparatus and the CCM-compatible device in the present embodiment. In FIG. 9, reference numeral 901 denotes transmission data.
[0076]
FIG. 10 is an explanatory diagram of a simultaneous transmission method performed between the transmission apparatus and each of the CCM compatible device and the non-CCM compatible device in the present embodiment.
[0077]
8 to 10, an application 802 a is an application that transmits data to the AV device 401 that is a non-CCM compatible device, and an application 802 b is an application that transmits data to the AV device 302 that is a CCM compatible device. Shall. Further, the output plug 505a is used only when transmitting to / from a CCM non-compliant device.
[0078]
(1) First, a transmission method performed between a transmission device and a CCM non-compliant device will be described with reference to FIG. As an initial state, all output plugs are unused.
[0079]
The application 802a outputs permission to use any one of the output plugs as a request 506 to the plug management unit 803. When the plug management unit 803 receives the request 506, the plug management unit 803 transmits a command for confirming whether or not CCM is supported as a command 508 to the AV device 401 through the command issuing unit 504. For example, a command for inquiring whether the INPUT SELECT command is supported can be used as the command for confirming whether the CCM is supported.
[0080]
Since the AV device 401 does not support CCM, the response indicating that it is not supported is transmitted as a response 509 to the AV device 801.
[0081]
The plug management unit 803 can know that the AV device 401 is not compatible with the CCM by looking at the response 509 received through the command issuing unit 504, and outputs a permission to use the output plug 505a to the application 802a. At the same time, the plug management unit 803 outputs a command that instructs the AV device 401 to receive data from the IEEE 1394 to the AV device 401 via the command issuing unit 504 to the AV device 401.
[0082]
When the AV device 401 receives a command instructing to receive data from IEEE 1394, the AV device 401 establishes a p2p connection to the AV device 801. At this time, even if the AV device 401 is a device that always makes a p2p connection to a specific output plug (# 0) as described above, the AV device 401 can correctly make a p2p connection to the output plug 505a that is # 0. .
[0083]
Thus, when the application 802a receives permission to use the output plug 505a, the application 802a outputs the transmission data 804 through the output plug 505a.
[0084]
Then, the AV device 401 receives the transmission data 804 through the input plug 403a.
[0085]
Note that when the AV device 401 does not support a command for instructing the AV device 801 to receive data from the IEEE 1394, or even if the command is received, the AV device 801 does not necessarily support the AV device 801. When the p2p connection is not performed, for example, the user may directly operate the AV device 401 to perform the p2p connection to the AV device 801.
[0086]
Also, instead of the plug management unit 803, after the application 802a receives permission to use the output plug 505a, the AV device 401 instructs the AV device 801 to receive data from IEEE1394. 508 may be output to the AV device 401 through the command issuing unit 504.
[0087]
(2) Next, a transmission method performed between the transmission apparatus and the CCM-compatible device will be described with reference to FIG. As an initial state, all output plugs are unused.
[0088]
The application 802b outputs permission to use any output plug as a request 506 to the plug management unit 803. When the plug management unit 803 receives the request 506, the plug management unit 803 transmits a command for confirming whether or not CCM is supported to the AV device 302 through the command issuing unit 504 as a command 508. For example, a command for inquiring whether the INPUT SELECT command is supported can be used as the command for confirming whether the CCM is supported.
[0089]
Since the AV device 302 is compatible with CCM, an answer indicating that it is compatible is transmitted as a response 509 to the AV device 801.
[0090]
The plug management unit 803 can know that the AV device 302 is compatible with the CCM by looking at the response 509 received through the command issuing unit 504, so that any output plug other than the output plug 505a that is # 0 is selected. If it is usable, use permission of the usable output plug is output to the application 802b. In this embodiment, since the output plug 505b can be used, permission to use the output plug 505b is output to the application 802b. At the same time, the plug management unit 803 sends a command for instructing the AV device 302 to perform the p2p connection between the output plug 505b and the input plug 305d of the AV device 501 as a command 508 through the command issuing unit 504. Output to.
[0091]
When the AV device 302 receives a command for instructing the p2p connection, the AV device 302 performs the p2p connection between the output plug 505b and the input plug 305d of the AV device 801.
[0092]
Thus, when the application 802b receives permission to use the output plug 505b, the application 802b outputs the transmission data 901 through the output plug 505b.
[0093]
Then, the AV device 302 receives the transmission data 901 through the input plug 305d.
[0094]
The timing at which the p2p connection between the output plug 505b and the input plug 305d is established is arbitrary. In other words, before actual data transmission, the AV device 801 outputs a command for instructing data reception from the IEEE 1394 to the AV device 302 as a command 508, or the user directly operates the AV device 302. You may set so that data may be received from IEEE1394. In short, it is sufficient that the p2p connection is made between the AV device 801 and the AV device 302 before data transmission.
[0095]
In the above, (1) the transmission method performed between the transmission device and the CCM-incompatible device and (2) the transmission method performed between the transmission device and the CCM-compatible device have been described. When using a non-compliant device, always use output plug # 0. When the receiving device is a CCM compatible device, make sure to use an output plug other than output plug # 0 so that only transmission to the CCM compatible device is possible. It can be seen that the output plug # 0 is always usable even when Therefore, even when transmission to a CCM compatible device has already been performed, transmission to a CCM non-compatible device can be performed without any problem.
[0096]
That is, when these two processes (see FIGS. 8 to 9) are performed regardless of the order, a communication state as shown in FIG. 10 is obtained, and one CCM compatible device and one CCM non-communication are set. Data is simultaneously output to each compatible device.
[0097]
Of course, since the AV device 801 has a total of three output plugs, it is also possible to simultaneously output data to another AV device (in this case, it becomes a receiving device). The AV device must be a CCM compatible device).
[0098]
The second embodiment has been described in detail above.
[0099]
A medium carrying a program and / or data for causing a computer to execute all or part of the functions of all or part of the transmission apparatus of the present invention, which can be processed by the computer. The medium to be used also belongs to the present invention.
[0100]
Further, an information aggregate that is a program and / or data for causing a computer to execute all or part of the functions of all or part of the transmission apparatus of the present invention also belongs to the present invention.
[0101]
Further, the present invention is a medium carrying a program and / or data for causing a computer to execute all or part of the operations of all or some of the steps of the packet form determination method of the present invention, and that can be processed by the computer. The characteristic media also belong to the present invention.
[0102]
The present invention also includes an information aggregate that is a program and / or data for causing a computer to execute all or some of the operations of all or some of the steps of the packet form determination method of the present invention. .
[0103]
In the present embodiment described above, the determination of the output plug of the present invention is an apparatus that can specify from which output plug the data is output when receiving data output from the receiving apparatus as a result of the examination. If it is found that the data is received, it is performed on the transmitting device side and notified to the receiving device side. However, the present invention is not limited to this, and the determination of the output plug of the present invention may be performed by the receiving device based on the result of the notification, for example, the usage status of the plurality of output plugs in the transmitting device is notified to the receiving device. . In short, the determination of the output plug according to the present invention is made by issuing a command for examining whether or not the output device can specify data output from which output plug when the receiving device receives the output data. And may be performed based on the result of the examination.
[0104]
The command issuing means of the present invention is a means including a command issuing unit in the above-described embodiment. However, the present invention is not limited to this, and the command issuing means of the present invention, in essence, checks whether or not the output device can specify data output from which output plug when receiving the output data. Any means may be used as long as it issues a command to the receiving device.
[0105]
Also, the output plug determining means of the present invention has a plug management unit for managing the usage status of a plurality of output plugs and an application for outputting data to the receiving device in the above-described embodiment. It was a means. However, the present invention is not limited to this, and the output plug determining means of the present invention may be any means for determining an output plug to which data should be output based on the result of the examination.
[0106]
Further, an instruction for issuing the command of the present invention to the receiving apparatus may be performed by the application of the present invention or may be performed by the plug management unit of the present invention.
[0107]
Of course, the application inquires the plug management unit about the output plug to output data, and the plug management unit accepts the inquiry and (1) determines the output plug to output data. The transmission device that notifies the determined output plug to the application, and (2) when the determination is not made, is included in the present invention.
[0108]
The application also inquires the usage status of multiple output plugs to the plug management unit, the plug management unit accepts the inquiry, notifies the usage status of multiple output plugs to the application, and the plug management unit accepts the notification. Thus, a transmission device that determines an output plug to which data is to be output and requests the plug management unit to use the determined output plug is included in the present invention.
[0109]
Further, the connection for outputting data to the receiving device via the transmission bus of the present invention may be made substantially when the output plug is determined, or may be made substantially when the data is outputted. Good.
[0110]
The present invention is a program for causing a computer to execute the functions of all or part of the above-described transmission device of the present invention (or the device, element, circuit, unit, etc.), and cooperates with the computer. It is a program that operates as Of course, the computer of the present invention is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.
[0111]
Note that a part of the means (or an apparatus, an element, a circuit, a part, etc.) of the present invention means some means of the plurality of means, or a part of functions of one means. Means.
[0112]
In addition, some devices (or elements, circuits, parts, etc.) of the present invention mean some devices of the plurality of devices, or some means (or Element, circuit, part, etc.) or a function of a part of one means.
[0113]
Further, the present invention includes a computer-readable recording medium that records the program of the present invention. Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer. Further, one usage form of the program of the present invention may be an aspect in which the program is transmitted through a transmission medium, read by a computer, and operated in cooperation with the computer. The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet, light, radio waves, sound waves, and the like.
[0114]
The configuration of the present invention may be realized by software or hardware.
[0115]
As described above, the present invention provides, for example, one or a plurality of output plugs that output a data stream through a transmission bus to a receiving device that has an input plug, and a plug management unit that manages the output plug;
If the receiving device cannot specify from which output plug the data stream is to be output, it issues a request to use the first output plug of the output plugs to the output plug management means, and When permission to use the first output plug is returned from the plug management means, the data stream is output to the transmission bus through the first output plug;
If the receiving device can specify from which output plug the data stream is to be output, it issues a request to use the unspecified output plug to the plug management means, and if the plug management means When permission to use the second output plug is returned from the output plugs, a request for connection to the second output plug is issued to the receiving device, and the receiving device sends the input plug and the second plug. An application for outputting the data stream to the transmission bus through the second output plug after making a connection to an output plug;
The plug management means includes
When a request to use the first output plug is received from the application, if the first output plug is usable, the application is permitted to use the first output plug. Return, if the first output plug is not available, return to the application that the first output plug is unusable to the application;
When a request to use the unspecified output plug is received from the application, if there is an available output plug, one of the available output plugs is used as the second output plug. The transmission apparatus is characterized in that permission to use the second output plug is issued, and the use is disabled when there is no usable output plug.
[0116]
Further, according to the present invention, for example, the first output plug is a specific one of the output plugs, and the plug management unit is configured so that the receiving device receives the data stream from any of the output plugs. When it is possible to specify whether to output, the above-described transmission device is characterized in that the output plug other than the first output plug is selected as the second output plug.
[0117]
The present invention further includes, for example, command issuing means for transmitting a command to the receiving device through the transmission bus and receiving a response to the command through the transmission bus.
The application is the above-described transmitting device, wherein the connection request is output to the receiving device by issuing a predetermined command.
[0118]
In addition, the present invention is characterized in that, for example, the application issues a predetermined command to inquire whether or not the receiving apparatus can specify from which output plug the data stream is to be output. The above-described transmission device.
[0119]
In the present invention, for example, the transmission bus is an IEEE 1394 bus, the output plug is an output plug in the IEC61883 standard, the input plug is an input plug in the IEC61883 standard, and the command and the response are “AV” / C Digital Interface Command Set ”, and the receiver is compliant with IEC61883 and“ AV / C Digital Interface Command Set ”.
The connection from the receiving device to the output plug is to establish a point-to-point connection between the input plug and the output plug of the receiving device. It is.
[0120]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output, and the receiving device conforms to the “AV / CConnection and Compatibility Management Specification” standard. That is,
The above-described transmission apparatus is characterized in that the application issues the connection request using a command defined in the “AV / C Connection and Compatibility Management Specification” standard.
[0121]
The present invention also includes, for example, one or more output plugs that output a data stream through a transmission bus to a receiving device that has an input plug;
Plug management means for managing the output plug;
If the receiving device cannot specify from which output plug the data stream is to be output, it issues a request to use the first output plug of the output plugs to the output plug management means, and When permission to use the first output plug is returned from the plug management means, the data stream is output to the transmission bus through the first output plug;
If the receiving device can specify from which output plug the data stream is to be output, the plug management means inquires about the usage status of the output plug, and if there is an available output plug, A request for use of a second output plug, which is one of the usable output plugs, is sent to the plug management means, and if the use permission of the second output plug is returned from the plug management means. The data stream is sent through the second output plug after the connection request to the second output plug is sent to the reception device, and the reception device connects to the input plug and the second output plug. And an application for outputting to the transmission bus,
The plug management means includes
When a request to use the first output plug is received from the application, if the first output plug is usable, the application is permitted to use the first output plug. Return, if the first output plug is not available, return to the application that the first output plug is unusable to the application;
When a request to use the second output plug is received from the application, if the second output plug is usable, permission to use the second output plug is issued, and the second output plug is issued. In the above-described transmission apparatus, when the use of the output plug cannot be used, the use is made unusable, and when the use status of the output plug is inquired from the application, the use status of the output plug is returned.
[0122]
In the present invention, for example, an inquiry about the usage status of the output plug from the application specifies one or a plurality of the output plugs.
The above-mentioned transmission device is characterized in that the output plugs return the usage statuses of all the specified output plugs.
[0123]
In the present invention, for example, the first output plug is a specific one of the output plugs, and the output device can specify from which output plug the data stream is output. In this case, in the above-described transmission device, the plug management unit selects the output plug other than the first output plug as the second output plug.
[0124]
The present invention further includes, for example, command issuing means for transmitting a command to the receiving device through the transmission bus and receiving a response to the command through the transmission bus.
The application is the above-described transmitting device, wherein the connection request is output to the receiving device by issuing a predetermined command.
[0125]
In addition, the present invention is characterized in that, for example, the application issues a predetermined command to inquire whether or not the receiving apparatus can specify from which output plug the data stream is to be output. The above-described transmission device.
[0126]
In the present invention, for example, the transmission bus is an IEEE 1394 bus, the output plug is an output plug in the IEC61883 standard, the input plug is an input plug in the IEC61883 standard, and the command and the response are “AV” / C Digital Interface Command Set ”, and the receiver is compliant with IEC61883 and“ AV / C Digital Interface Command Set ”.
The connection from the receiving device to the output plug is to establish a point-to-point connection between the input plug and the output plug of the receiving device. It is.
[0127]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output, and the receiving device conforms to the “AV / CConnection and Compatibility Management Specification” standard. That is,
The above-described transmission apparatus is characterized in that the application issues the connection request using a command defined in the “AV / C Connection and Compatibility Management Specification” standard.
[0128]
The present invention also includes, for example, one or more output plugs that output a data stream to a receiving device through a transmission bus;
Plug management means for managing the output plug;
If the receiving device cannot specify from which output plug the data stream is to be output, it issues a request to use the first output plug of the output plugs to the output plug management means, and When permission to use the first output plug is returned from the plug management means, the data stream is then output to the transmission bus through the first output plug as necessary,
If the receiving device can specify from which output plug the data stream is to be output, it issues a request to use the unspecified output plug to the plug management means, and if the plug management means Of the output plugs, when the permission to use the second output plug is returned, the receiver is connected to the second output plug when the receiver connects to the output plug. An application that issues a connection reservation that specifies to perform, and outputs the data stream to the transmission bus through the second output plug as necessary,
The plug management means includes
When a request to use the first output plug is received from the application, if the first output plug is usable, the application is permitted to use the first output plug. Return, if the first output plug is not available, return to the application that the first output plug is unusable to the application;
When a request to use the unspecified output plug is received from the application, if there is an available output plug, one of the available output plugs is used as the second output plug. The transmission apparatus is characterized in that permission to use the second output plug is issued, and the use is disabled when there is no usable output plug.
[0129]
In the present invention, for example, the receiving device cannot specify from which output plug the data stream is output.
The first output plug specified by the application and the input plug of the receiving device are connected before or during output of the data stream to the transmission bus by the application. The above-described transmission device.
[0130]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output.
The second output plug specified by the application and the input plug of the receiving device are connected before or during output of the data stream to the transmission bus by the application. The above-described transmission device.
[0131]
In the present invention, for example, when the first output plug is the specific output plug, and the receiving device can specify from which output plug the data stream is output, the plug The managing means selects the output plug other than the first output plug as the second output plug.
[0132]
The present invention further includes, for example, command issuing means for transmitting a command to the receiving device through the transmission bus and receiving a response to the command through the transmission bus.
The application is the above-described transmitting device, wherein the connection request is output to the receiving device by issuing a predetermined command.
[0133]
In addition, the present invention is characterized in that, for example, the application issues a predetermined command to inquire whether or not the receiving apparatus can specify from which output plug the data stream is to be output. The above-described transmission device.
[0134]
In the present invention, for example, the transmission bus is an IEEE 1394 bus, the output plug is an output plug in the IEC61883 standard, the input plug is an input plug in the IEC61883 standard, and the command and the response are “AV” / C Digital Interface Command Set ”, and the receiver is compliant with IEC61883 and“ AV / C Digital Interface Command Set ”.
The connection from the receiving device to the output plug is to establish a point-to-point connection between the input plug and the output plug of the receiving device. It is.
[0135]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output, and the receiving device conforms to the “AV / CConnection and Compatibility Management Specification” standard. That is,
The above-described transmission apparatus is characterized in that the application issues the connection request using a command defined in the “AV / C Connection and Compatibility Management Specification” standard.
[0136]
The present invention also includes, for example, one or more output plugs that output a data stream to a receiving device through a transmission bus;
Plug management means for managing the output plug;
If the receiving device cannot specify from which output plug the data stream is to be output, it issues a request to use the first output plug of the output plugs to the output plug management means, and When permission to use the first output plug is returned from the plug management means, the data stream is then output to the transmission bus through the first output plug as necessary,
If the receiving device can specify from which output plug the data stream is to be output, the plug management means inquires about the usage status of the output plug, and if there is an available output plug, A request for use of a second output plug, which is one of the usable output plugs, is sent to the plug management means, and if the use permission of the second output plug is returned from the plug management means. A connection reservation for designating connection to the second output plug is issued to the receiving device when the receiving device connects to the output plug, and the second output is set as necessary. An application for outputting the data stream to the transmission bus through a plug;
The plug management means includes
When a request to use the first output plug is received from the application, if the first output plug is usable, the application is permitted to use the first output plug. Return, if the first output plug is not available, return to the application that the first output plug is unusable to the application;
When a request to use the second output plug is received from the application, if the second output plug is usable, permission to use the second output plug is issued and the second output plug is used. If the plug cannot be used, the second output plug is disabled.
When the application receives an inquiry about the usage status of the output plug, the transmission device returns the usage status of the output plug.
[0137]
In the present invention, for example, an inquiry about the usage status of the output plug from the application specifies one or a plurality of the output plugs.
The above-mentioned transmission device is characterized in that the output plugs return the usage statuses of all the specified output plugs.
[0138]
In the present invention, for example, the receiving device cannot specify from which output plug the data stream is output.
The first output plug specified by the application and the input plug of the receiving device are connected before or during output of the data stream to the transmission bus by the application. The above-described transmission device.
[0139]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output.
The second output plug specified by the application and the input plug of the receiving device are connected before or during output of the data stream to the transmission bus by the application. The above-described transmission device.
[0140]
In the present invention, for example, when the first output plug is the specific output plug, and the receiving device can specify from which output plug the data stream is output, the plug The managing means selects the output plug other than the first output plug as the second output plug.
[0141]
The present invention further includes, for example, command issuing means for transmitting a command to the receiving device through the transmission bus and receiving a response to the command through the transmission bus.
The application is the above-described transmitting device, wherein the connection request is output to the receiving device by issuing a predetermined command.
[0142]
In addition, the present invention is characterized in that, for example, the application issues a predetermined command to inquire whether or not the receiving apparatus can specify from which output plug the data stream is to be output. The above-described transmission device.
[0143]
In the present invention, for example, the transmission bus is an IEEE 1394 bus, the output plug is an output plug in the IEC61883 standard, the input plug is an input plug in the IEC61883 standard, and the command and the response are “AV” / C Digital Interface Command Set ”, and the receiver is compliant with IEC61883 and“ AV / C Digital Interface Command Set ”.
The connection from the receiving device to the output plug is to establish a point-to-point connection between the input plug and the output plug of the receiving device. It is.
[0144]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output, and the receiving device conforms to the “AV / CConnection and Compatibility Management Specification” standard. That is,
The above-described transmission apparatus is characterized in that the application issues the connection request using a command defined in the “AV / C Connection and Compatibility Management Specification” standard.
[0145]
The present invention also includes, for example, one or more output plugs that output a data stream through a transmission bus to a receiving device that has an input plug;
Plug management means for managing the output plug;
A request to use the unspecified output plug is issued to the plug management unit, and if the plug management unit returns permission to use the first output plug of the output plugs, as necessary An application for outputting the data stream to the transmission bus through the first output plug;
The plug management means includes
If the receiving device cannot specify from which output plug the data stream is to be output, when the request for using the unspecified output plug is received from the application, the available output plug is set. As the first output plug, the use permission of the first output plug is returned to the application,
If the receiving device can designate from which output plug the data stream is to be output, first, the usable output plug is set as the first output plug to the receiving device as the first output plug. When the receiving device connects to the input plug and the first output plug, the use permission of the first output plug is returned to the application.
When all of the output plugs cannot be used, the transmission device returns an unusable status to the application.
[0146]
Also, the present invention provides, for example, if the receiving device cannot specify from which output plug the data stream is to be output, the plug management means always has a specific output as the first output plug. The above-described transmission device is characterized in that a second output plug that is the output plug is selected, and when the second output plug cannot be used, an unusable state is returned to the application.
[0147]
In the present invention, for example, when the receiving apparatus can specify from which output plug the data stream is output, the output plug other than the second output plug is used as the first output plug. The above-described transmission apparatus is characterized in that
[0148]
The present invention further includes, for example, command issuing means for transmitting a command to the receiving device through the transmission bus and receiving a response to the command through the transmission bus.
The application is the above-described transmitting device, wherein the connection request is output to the receiving device by issuing a predetermined command.
[0149]
In addition, the present invention is characterized in that, for example, the application issues a predetermined command to inquire whether or not the receiving apparatus can specify from which output plug the data stream is to be output. The above-described transmission device.
[0150]
In the present invention, for example, the transmission bus is an IEEE 1394 bus, the output plug is an output plug in the IEC61883 standard, the input plug is an input plug in the IEC61883 standard, and the command and the response are “AV” / C Digital Interface Command Set ”, and the receiver is compliant with IEC61883 and“ AV / C Digital Interface Command Set ”.
The connection from the receiving device to the output plug is to establish a point-to-point connection between the input plug and the output plug of the receiving device. It is.
[0151]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output, and the receiving device conforms to the “AV / CConnection and Compatibility Management Specification” standard. That is,
The above-described transmission apparatus is characterized in that the application issues the connection request using a command defined in the “AV / C Connection and Compatibility Management Specification” standard.
[0152]
The present invention also includes, for example, one or more output plugs that output a data stream through a transmission bus to a receiving device that has an input plug;
Plug management means for managing the output plug;
A request to use the unspecified output plug is issued to the plug management unit, and if the plug management unit returns permission to use the first output plug of the output plugs, as necessary An application for outputting the data stream to the transmission bus through the first output plug;
The plug management means includes
If the receiving device cannot specify from which output plug the data stream is to be output, when the request for using the unspecified output plug is received from the application, the available output plug is set. As the first output plug, the use permission of the first output plug is returned to the application,
If the receiving device can specify from which output plug the data stream is to be output, if the receiving device connects to the output plug, the first device After issuing a connection reservation that specifies to connect to the output plug, return permission to use the first output plug to the application,
When all of the output plugs cannot be used, the transmission device returns an unusable status to the application.
[0153]
Also, the present invention provides, for example, if the receiving device cannot specify from which output plug the data stream is to be output, the plug management means always has a specific output as the first output plug. The above-described transmission device is characterized in that a second output plug that is the output plug is selected, and when the second output plug cannot be used, an unusable state is returned to the application.
[0154]
In the present invention, for example, when the receiving apparatus can specify from which output plug the data stream is output, the output plug other than the second output plug is used as the first output plug. The above-described transmission apparatus is characterized in that
[0155]
The present invention further includes, for example, command issuing means for transmitting a command to the receiving device through the transmission bus and receiving a response to the command through the transmission bus.
The application is the above-described transmitting device, wherein the connection request is output to the receiving device by issuing a predetermined command.
[0156]
In addition, the present invention is characterized in that, for example, the application issues a predetermined command to inquire whether or not the receiving apparatus can specify from which output plug the data stream is to be output. The above-described transmission device.
[0157]
In the present invention, for example, the transmission bus is an IEEE 1394 bus, the output plug is an output plug in the IEC61883 standard, the input plug is an input plug in the IEC61883 standard, and the command and the response are “AV” / C Digital Interface Command Set ”, and the receiver is compliant with IEC61883 and“ AV / C Digital Interface Command Set ”.
The connection from the receiving device to the output plug is to establish a point-to-point connection between the input plug and the output plug of the receiving device. It is.
[0158]
In the present invention, for example, the receiving device can specify from which output plug the data stream is output, and the receiving device conforms to the “AV / CConnection and Compatibility Management Specification” standard. That is,
The above-described transmission apparatus is characterized in that the application issues the connection request using a command defined in the “AV / C Connection and Compatibility Management Specification” standard.
[0159]
Further, the present invention is a medium carrying a program and / or data for causing a computer to execute all or part of the functions of all or part of the above-described transmission apparatus, and can be processed by the computer. It is a medium characterized by this.
[0160]
Further, the present invention is an information aggregate characterized in that it is a program and / or data for causing a computer to execute all or part of the functions of all or part of the above-described transmission apparatus. .
[0161]
【The invention's effect】
As is apparent from the above description, the present invention has the advantage that a plurality of streams can be transmitted simultaneously even when the receiving device includes a device that does not support CCM.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of plugs and connections in IEC61883.
FIG. 2 is an explanatory diagram of an example of an overlay in IEC61883
FIG. 3 is an explanatory diagram of an example of a connection (connection method) in a CCM-compatible device.
FIG. 4 is an explanatory diagram of an example of a connection (connection method) in a non-CCM compatible device
FIG. 5 is an explanatory diagram of a transmission method performed between the transmission apparatus and the non-CCM compatible device in Embodiment 1 of the present invention.
FIG. 6 is an explanatory diagram of a transmission method performed between the transmission apparatus and the CCM-compatible device according to the first embodiment of the present invention.
FIG. 7 is an explanatory diagram of a simultaneous transmission method performed between the transmission apparatus and each of the CCM compatible device and the non-CCM compatible device in Embodiment 1 of the present invention.
FIG. 8 is an explanatory diagram of a transmission method performed between the transmission apparatus and the non-CCM compatible device in Embodiment 2 of the present invention.
FIG. 9 is an explanatory diagram of a transmission method performed between the transmission apparatus and the CCM-compatible device according to the second embodiment of the present invention.
FIG. 10 is an explanatory diagram of a simultaneous transmission method performed between the transmission apparatus and each of the CCM compatible device and the non-CCM compatible device in Embodiment 2 of the present invention.
[Explanation of symbols]
101, 102, 103 AV equipment
104 IEEE1394 bus
105a, 105b, 105c Input plug
106a, 106b, 106c Output plug
201a, 201b, 201c AV equipment
202a, 202b, 202c Output plug
203a, 203b, 203c Input plug
301, 302, 303 AV equipment
304a, 304b, 304c Output plug
305d, 305e Input plug
401 AV equipment
402a Output plug
403a Input plug
501 AV equipment
502a, 502b application
503 Plug Management Department
504 Command issuing part
505a, 505b, 505c Output plug
506 requests
507 response
508 command
509 response
510 Transmission data
601 Transmission data
801 AV equipment
802a, 802b application
803 Plug Management Department
804 Transmission data
901 Transmission data

Claims (12)

A plurality of output plugs for outputting data to the receiving device via the transmission bus;
When the receiving device receives the output data, it issues a command to the receiving device to check whether or not the output plug can output the data. Command issuing means;
A transmission apparatus comprising: an output plug determining means for determining the output plug to which the data is to be output based on a result of the examination. At least one of the plurality of output plugs is a dedicated output plug dedicated to a device that cannot specify from which output plug the data is output when receiving the output data,
As a result of the examination, when it is determined that the receiving device can specify from which output plug the data is output when receiving the output data, the data is output. The transmission device according to claim 1, wherein the power plug is determined as an output plug other than the dedicated output plug among the plurality of output plugs. As a result of the examination, if it is determined that the receiving device can specify from which output plug the data is output when receiving the output data, the determination of the output plug is The transmission apparatus according to claim 2, wherein the transmission apparatus is performed on the transmission apparatus side and notified to the reception apparatus side. The output plug determining means has a plug management unit for managing the usage status of the plurality of output plugs, and an application for outputting data to the receiving device,
The transmission apparatus according to claim 3, wherein an instruction for issuing the command to the reception apparatus is performed by the application. The application inquires the plug management unit for an output plug to which the data is to be output,
When the plug management unit accepts the inquiry and determines (1) the output plug to which the data is to be output, the plug management unit notifies the determined output plug to the application, and (2) If it cannot be determined, notify the application to that effect,
The transmission device according to claim 4, wherein the connection for outputting data to the reception device via the transmission bus is performed after the determination of the output plug is notified to the reception device side . The application inquires the plug management unit about the usage status of the plurality of output plugs,
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
The application receives the notification, determines an output plug to output the data, and requests the plug management unit to use the determined output plug,
The transmission device according to claim 4, wherein the connection for outputting data to the reception device via the transmission bus is performed after the determination of the output plug is notified to the reception device side . The application inquires the plug management unit for an output plug to which the data is to be output,
When the plug management unit accepts the inquiry and determines (1) the output plug to which the data is to be output, the plug management unit notifies the determined output plug to the application, and (2) If it cannot be determined, notify the application to that effect,
The transmission device according to claim 4, wherein the connection for outputting data to the reception device via the transmission bus is performed before the output of the data is started . The application inquires the plug management unit about the usage status of the plurality of output plugs,
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
The application receives the notification, determines an output plug to output the data, and requests the plug management unit to use the determined output plug,
The transmission device according to claim 4, wherein the connection for outputting data to the reception device via the transmission bus is performed before the output of the data is started . The output plug determining means has a plug management unit for managing the usage status of the plurality of output plugs, and an application for outputting data to the receiving device,
The transmission apparatus according to claim 3, wherein an instruction for issuing the command to the reception apparatus is performed by the plug management unit. The application inquires the plug management unit about the usage status of the plurality of output plugs,
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
The application receives the notification, determines an output plug to output the data, and requests the plug management unit to use the determined output plug,
The transmission device according to claim 9, wherein the connection for outputting data to the reception device via the transmission bus is performed after the determination of the output plug is notified to the reception device side . The application inquires the plug management unit about the usage status of the plurality of output plugs,
The plug management unit receives the inquiry, notifies the application of the usage status of the plurality of output plugs,
The application receives the notification, determines an output plug to output the data, and requests the plug management unit to use the determined output plug,
The transmission device according to claim 9, wherein the connection for outputting data to the reception device via the transmission bus is performed before the output of the data is started . The transmission device according to claim 1, wherein a plurality of output plugs for outputting data to a reception device via a transmission bus, and any of the output plugs when the reception device receives the output data. Command issuing means for issuing a command for checking whether or not the device can specify whether to output data to the receiving device, and the output plug to which the data is to be output as a result of the checking program for causing a computer to function as the output plug determining means for determining based.

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