KR100623020B1 - Control Method of Digital Camcoder in IEEE1394 - Google Patents

Abstract

The present invention relates to a digital camcorder control method in IEEE1394, comprising: a) determining whether a camcorder is connected; b) generating a transmission status AV / C command frame and confirming a response frame thereto; c) determining whether a value of the response frame is in a recording state; d) generating a mandatory state command frame of the camera AV / C command set if the value of the response frame is in a recording state; e) determining whether the required state command frame is executable; And g) determining the camera mode if the mandatory state command frame is executable, and generating an AV / C command frame corresponding thereto, and notifying the command set to the outside.

IEEE1394, AV / C, Digital Camcorders

Description

Control Method of Digital Camcorder in IEEE133.4 {Control Method of Digital Camcoder in IEEE1394}

1 illustrates a topology of a typical 1394 serial bus.

2 is a diagram illustrating a relationship between common 1394 serial bus protocol layers.

FIG. 3 illustrates an audio / video control command frame (AV / C command) of the audio / video control command and transaction set and the audio / video control command and transaction set used in SBP-2. frame).

4 shows a command type (ctype) of the audio / video control command frame (AV / C command frame) of FIG.

FIG. 5 shows a subunit_type of the AV / C command frame of FIG. 3; FIG.

FIG. 6 is a diagram illustrating a subunit ID of the audio / video control command frame of FIG. 3. FIG.

FIG. 7 illustrates an opcode of the audio / video control command frame of FIG. 3. FIG.

FIG. 8 illustrates an audio / video control response frame (AV / C response) of the audio / video control command and transaction set and the audio / video control command and transaction set used in SBP-2. frame).

9 illustrates a response type of the audio / video control response frame of FIG. 8; FIG.

10 is a flowchart illustrating a method of controlling a digital camcorder according to an embodiment of the present invention.

The present invention relates to a method for controlling a digital camcorder in IEEE1394. More particularly, the present invention relates to a method for controlling a digital camcorder with AV / C commands supported by a camcorder in another device.

1 is a diagram illustrating a topology of a 1394 serial bus according to the prior art, in which a digital TV 1, a PC 2, a CDROM 3, a digital camera 4, and a digital camcoder 5 are shown. ), DVCR (6), DVD RAM (7), and Printer (8) are connected by a 1394 serial bus so as not to form a loop.

FIG. 2 is a diagram illustrating a relationship between 1394 serial bus protocol layers according to the prior art, and includes serial bus management (hereinafter, referred to as SBM) 11, a physical layer 12, and FIG. Link layer 13, A / V CIP layers 14, Application layer, Transaction layer 16, Plug control register (Plug Control Register) 17, Connection Management Protocol section 18, Function Control Protocol section 19, and audio / video control command and transaction set (AV / C) Command and Transaction Set) and SBP-2 (20).

FIG. 3 illustrates an audio / video control command frame (AV / C command) of the audio / video control command and transaction set and the audio / video control command and transaction set used in SBP-2. The AV / C command frame is a 4-bit " 0 " indicating that the frame is an audio / video control command (AV / C Commands), and a command type. ctype), a subunit_type, a subunit ID, an opcode, a plurality of operands, and the like.

FIG. 4 is a diagram illustrating a command type (ctype) of an audio / video control command frame (AV / C command frame) of FIG. 3, wherein the command type (ctype) indicates a control (CONTROL) for instructing an operation to be controlled. "0" to indicate, "1" to indicate the current status of the controlled device, and a specific inquisition to determine whether the controlled device supports an operation for a certain type of command. "2" for SPECIFIC INQUIRY), "3" for NOTIFY for grasping the current state of the controlled device and receiving information on the changed state of the controlled device later. "4", which stands for GENERAL INQUIRY to determine whether any mode supports operation, Reserved for future details " 5-7 " representing a re specification, and " 8-F ₁₆ " representing a reserved for response code.

FIG. 5 is a diagram illustrating a subunit_type of an audio / video control command frame (AV / C command frame) of FIG. 3, wherein the subunit_type represents a video monitor. 0 "," 1-2 "indicating a reserved for future specification," 3 "indicating a disc recorder / player of audio or video, a tape recorder of audio or video "4" for / tape recorder / player, "5" for tuner, "6" for reserved for future specification, "7" for video camera "," 8-1B ₁₆ ", which represents a Reserved for future specification," 1C ₁₆ ", which represents a vendor unique, and" Reserved for all ". subunit_types) Indicating "1D _16", and then made to "1F _16" indicating "1E _16", the unit (Unit) that indicates the by Trojan extended _ subunit type (subunit_type extended next byte).

FIG. 6 is a diagram illustrating a subunit ID of the AV / C command frame of FIG. 3, wherein the subunit ID represents an instance number. 0-4 "," 5 "for the subunit ID extended next byte," 6 "for the Reserved for all subunit types, Ignore It consists of "7" which represents.

FIG. 7 is a diagram illustrating an opcode of an audio / video control command frame (AV / C command frame) of FIG. 3. The opcode is a unit and subunit command as shown in FIG. 7. "0-F ₁₆ " for Unit and subunit commands, "10 ₁₆ -3F ₁₆ " for Unit command, "40 ₁₆ -7F ₁₆ " for Subunit commands, future a "80 ₁₆ -9F _16", unit and subunit "A0 ~ BF _{16 16",} the command subunit (subunit commands) to indicate a command (unit commands and subunit) indicating reserved (reserved for future specification) for the above-described &Quot; C0 ₁₆ -DF _{16 &} quot ;, which represents " EE ₁₆ -FF ₁₆ ", which indicates a reserved for future specification.

FIG. 8 illustrates an audio / video control response frame (AV / C response) of the audio / video control command and transaction set and the audio / video control command and transaction set used in SBP-2. frame, wherein the audio / video control response frame (AV / C response frame) is a 4-bit " 0 ", response type, indicating that the frame is an audio / video control command (AV / C Commands). , A subunit_type, a subunit ID, an opcode, a plurality of operands, and the like.

FIG. 9 is a diagram illustrating a response type of FIG. 8, in which "0-7" represents a reserved for command types, and "8" represents a NOT IMPLEMENTED. FIG. , "9" for ACCEPTED, "A ₁₆ " for REJECTED, "B ₁₆ " for IN TRANSITION, and IMPLEMENTED / STABLE. “C ₁₆ ”, “D ₁₆ ” for CHANGED, “E ₁₆ ” for Reserved for future specification, “F ₁₆ ” for INTERIM. .

Referring to the accompanying drawings, a method for controlling a device of a bus system according to the related art configured as described above is as follows.

First, as shown in FIG. 1, the physical connection between the devices is connected by a 1394 serial bus cable for transmitting data in both directions, and the devices have one or more 1394 serial bus cable connection ports.

The configuration of the network is then automatically determined at bus initialization, and devices with multiple cable ports act as signal repeaters to create a local bus.

Each device on the 1394 serial bus is configured for terminators, transceivers, arbitration, packet formatting, and data transfer control for each port. It is composed of logic and isochronous data through channels and bandwidth allocated from asynchronous data and SBM's Isochronous Resource Manager (hereinafter abbreviated as IRM). ).

The SBM is a node controller for isochronous communication and associative communication, an IRM for isochronous communication, a bus topology, a bus speed, a power management ( It is composed of a bus manager for performing power management.

The isochronous data is transmitted in an isochronous packet structure as real time data, and a common isochronous packet application interface layer for processing such isochronous packets is provided. The relationship between the protocol layers of the 1394 serial bus having a common isochronous packet application interface layer is shown in FIG.

The protocol is to send a series of source packets from an application of one device to an application of another device.

Also, in order to control the operation between the audio / video devices as shown in FIG. 1, an audio / video control command and transaction set in each audio / video device as shown in FIG. And an audio / video control command frame (AV / C command frame) as shown in FIG. 3 in the function control protocol unit 19 under the control of the SBP-2 20 through the lower layers. Transfer to the cable environment.

In this case, since the controller to control the control target device has different supporting information for each command for each audio / video device, the audio / video control command (AV / C command) according to the support level (Support Level) To find out, you'll need to use Commands such as Specific Inquiry and General Inquiry.

The Support Level includes Mandatory, Recommanded, Optional, and Vendor-dependent.

That is, the controller records "2" or "4" in the command type (ctype) in the audio / video control commands (AV / C commands) as shown in FIG. 4 in order to determine whether the control target device is supported. In this case, a specific inquiry or general inquiry command is transmitted through a lower layer to a 1394 cable environment.

Then, the control target device receives the audio / video control commands (AV / C commands) through the 1394 cable environment, searches for a command type (ctype), and if the search result is "2" or "4", the spherical inquiries ( Recognized as a Specific Inquiry or General Inquiry command, it records its support in an audio / video control response frame and transmits it through lower layer and 1394 cable environments.

Accordingly, the controller according to the transmitted audio / video control response frame (AV / C response frame), as shown in Figures 4 to 7, 4 bits indicating that the audio / video control commands (AV / C Commands) "0", command type (ctype), subunit_type, subunit ID, subcode, opcode, a plurality of operands, etc. command frame) to transmit over lower layer and 1394 cable environment.

Then, the control target device receives the audio / video control command frame via the 1394 cable environment, and according to the command type ctype, the response code as shown in FIG. A code corresponding to the command type (ctype) is recorded to transmit an audio / video control response frame (AV / C response frame) as shown in FIG.

That is, the control target device is not implemented if the command type (ctype) is a control command according to a result of processing the audio / video control command frame (AV / C command frame). One of Accepted, Rejected, and Interim is Not Implemented, Rejected, In Transition, and Status Command. One of the Stables, one of Not Implemented, Rejected, and Interim if it is a Notify command. In case of General Inquiry, one of Not Implemented and Implemented is recorded and transmitted in the audio / video control response frame.

Accordingly, the device to control the controlled device can grasp the control result of the controlled device according to the transmitted AV / C response frame.

Digital camcorders have two or more sub-units defined by 1394, and the user can select and operate them (for example, the digital camcorder is designed to select camera mode, tape mode, etc.). In order to control the digital camcorder externally with the AV / C command, there is a problem in that the user must distinguish the mode selected by the user and the AV / C command defined according to each subunit (camera or tape recorder).

An object of the present invention is to always determine whether the digital camcorder is in tape mode (tape recorder) or camera mode before generating an AV / C command to control the digital camcorder externally. The purpose of this is to create a suitable AV / C command and to distinguish it using the required commands supported by all camcorders among tape recorder AV / C commands and camera AV / C commands among the AV / C commands established by IEEE1394. To provide.

In order to achieve the above object, a digital camcorder control method in IEEE1394 of the present invention comprises the steps of: a) determining whether a camcorder is connected; b) generating a transmission status AV / C command frame and confirming a response frame thereto; c) determining whether a value of the response frame is in a recording state; d) generating a mandatory state command frame of the camera AV / C command set if the value of the response frame is in a recording state; e) determining whether the required state command frame is executable; And g) determining the camera mode if the mandatory state command frame is executable, and generating an AV / C command frame corresponding thereto, and notifying the command set to the outside.

In the present invention, step c) may further include determining that the value of the response frame is not in a recording state, the tape recorder mode, and generating an AV / C command frame corresponding thereto and informing the command set to the outside. Do.

In the present invention, step e) further comprises the step of determining in the tape recorder mode if the mandatory state command frame is not executable, generating the corresponding AV / C command frame, and then notifying the command set to the outside. Do.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

10 is a flowchart illustrating a control method of a digital camcorder according to an embodiment of the present invention.

Referring to FIG. 10, step 1001 is a process of checking whether a camcorder is connected.

Steps 1002 and 1003 are processes of generating, transmitting a transport state command frame and confirming a response thereof.

If the digital camcorder is connected to the network in step 1001, a response frame is generated only when a transmission status AV / C command frame, which is an essential AV / C command of the tape recorder, is generated and the response is normally performed. Determine the value of).

The value of the response frame may have a value of media playback, recording, playback, and rewinding. If not, the response frame is determined to be a tape recorder mode.

Step 1004 is a process of generating a camera mandatory status command frame.

When responding with the recording status, the required status command of the camera AV / C command set is generated.

Step 1005 is a process of checking whether the required state command frame is executable.

If it is impossible to perform the command frame and rejects it, it is determined to be in the tape recorder mode and the generation of the AV / C command of the tape recorder is prepared. (S1006a to S1007a) If not rejected, camera mode is determined. If it is determined that it is a tape recorder mode or a camera mode, the corresponding AV / C command set is assigned to each to control the digital camcorder externally so that the command set supported in the current mode can be externally controlled for smooth control.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

As described above, according to the present invention, since the state of the digital camcorder is grasped in advance and the corresponding AV / C command is notified to the outside, smooth control is possible.

Claims (3)

a) determining whether the camcorder is connected; b) generating a transmission status AV / C command frame and confirming a response frame thereto; c) determining whether a value of the response frame is in a recording state; d) If the value of the response frame is in the recording state, a mandatory state command frame of the camera AV / C command set is generated, and if the value of the response frame is not in the recording state, the tape recorder mode is determined, and the corresponding AV / C command is generated. Informing the command set to the outside after generating a frame; e) determining whether the required state command frame is executable; g) determining the camera mode if the mandatory state command frame is executable, and generating a corresponding AV / C command frame and informing the command set to the outside. delete The method of claim 1, wherein step e) And determining the tape recorder mode if the mandatory state command frame is not executable, generating a corresponding AV / C command frame, and then notifying the command set to the outside. Control method.

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