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Text File | 1992-02-27 | 11.2 KB | 332 lines | [TEXT/pdos] |
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- Media Control Stack
- ERS Version 1.0d2
-
- Last Revision Wednesday, October 2, 1991
-
-
-
-
- Media Control Stack Description
- The Media Control stack (hereafter referred to as the MC stack) allows
- the user to control a wide variety of interactive media devices from
- HyperCard IIGS version 1.1. Interactive media devices are most
- clearly typified by CD-ROM drives and LaserDisc players although
- certain other types of devices such as VCRs may contain a hardware
- interface through which they can be controlled by a computer.
-
- The MC stack controls these devices by interfacing with the Media
- Control Tool which will be shipping with Apple IIGS System 6.0 and is
- required to use this stack. The MC stack also provides options to
- work with the Apple II Video Overlay card.
-
-
- Media Control Stack Implementation
- The MC stack is one of two totally new stacks shipping with HyperCard
- IIGS version 1.1. The stack will reside on the HyperTalk Help disk
- and be installed into a folder called Stacks along with the rest of
- the stacks shipping with HyperCard IIGS version 1.1. The Home stack
- has been extended to include a link to this stack through the Tool Kit
- card. The MC stack is less than 100K in size.
-
- The MC stack, like the rest of the HyperCard IIGS shipping stacks and
- HyperCard IIGS itself, provides several levels of involvement and
- complexity for the user. Users who wish to play laser discs, CDs,
- etc. may use the built in Media Control window to control these
- devices from the Media Control stack or from any other stack.
-
-
- Open File "Media.1" to see Figure 1 - Media Control Window
-
- For those users wishing to create their own stacks but who are not
- accomplished HyperTalk scripters, the stack provides a card of ready-
- made buttons which can be pasted into their own stacks and used
- without modification.
-
- The final level available to those who wish to script in HyperTalk are
- the scripts of the ready-made buttons which can be examined for
- examples of how to access the features of the Media Control XCMD.
- Also available is a card which lists all features and syntax to use
- them of the Media Control XCMD. The MC stack will install this XCMD
- in any stack of the user's choosing, just as in the Scripter's Tools
- stack.
-
- The Media Control XCMD
- The Media Control XCMD provides a HyperCard interface to the commands
- available with the Media Control tool. The commands presented to the
- user have been kept as close as possible to the syntax and structure
- of the Media Control tool commands but with regard to the different
- audience who will be generally using the XCMD (scripters) as compared
- to the tool (programmers). For example,while the tool requires time
- parameters to be input as BCD time values, the XCMD allows time in the
- format "hh hours, mm minutes, ss seconds."
-
- Media Control XCMD Commands
- The following section details the commands available through the Media
- Control XCMD.
-
-
- Media Control Command - "Control"
- Syntax:
- MediaControl <channel>, "Control", <cmd>
-
- This powerful command provides access to many aspects of the Media
- Control Toolset including audio output configurations and
- communication parameters. The following subcommands are available:
- Serial port subcommands
- 8data1stop, 8data2stop, 7data1stop, 7data2stop, 6data1stop,
- 6data2stop
- 5data1stop,5data2stop
- BaudDefault, Baud50, Baud75, Baud110, Baud134, Baud150, Baud300,
- Baud600, Baud1200, Baud1800, Baud2400, Baud3600, Baud4800,
- Baud7200
- Baud9600, Baud19200
- ControlCom, ModemPort, PrinterPort
-
- Audio channel subcommands
- AudioLeft, AudioLinLR, AudioLinLMR, AudioLinR, AudioMinL,
- AudioMinLLinR,
- AudioMinLRinR, AudioMinR, AudioMonaural, AudioOff, AudioReverse,
- AudioRight, AudioRinL, AudioRinLMR, AudioRinLR, AudioStereo
-
- Video subcommands
- DisplayOff, DisplayOn, VideoOff, VideoOn
-
- Miscellaneous subcommands
- Eject, IgnoreDiskSwitched, Initialize, LockDevice,
- ReportDiskSwitched, UnlockDevice
-
-
- Media Control Command - "GetDiscID"
- Syntax:
- MediaControl <channel>, "GetDiscID"
-
- This command returns a unique ID for the currently running disc in the
- global variable MediaResult. For a CD, this value is the total number
- of blocks or the serial number if available.
-
-
- Media Control Command - "GetDriverName"
- Syntax:
- MediaControl <channel>, "GetDriverName"
-
- This returns the name, version, and port used for the device driver
- currently connected to the specified channel in the global variable
- MediaResult.
-
- MediaResult will contain the text "NoPlayer" if no device driver is
- connected to the specified channel.
-
- Media Control Command - "GetNumTracks"
- Syntax:
- MediaControl <channel>, "GetNumTracks"
-
- This command returns the number of tracks/ chapters on the media in
- the device connected to the specified channel. The value will be
- returned in the global variable MediaResult.
-
-
- Media Control Command - "GetPosition"
- Syntax:
- MediaControl <channel>, "GetPosition",
- "InChapters|InFrames|InTime"
-
- This command returns the current position of the specified device.
- This number will be returned in MediaResult if "InChapters" or
- "InFrames" is selected. If you specify "InTime", the location will be
- returned in the form "hh hours, mm minutes, ss seconds" if the current
- device supports this.
-
-
- Media Control Command - "GetSpeeds"
- Syntax:
- MediaControl <channel>, "GetSpeeds"
-
- This returns a comma delimited list of speeds (in frames per second)
- that the device connected to the specified channel can play. The list
- of speeds is returned in the global variable MediaResult. CD-ROM
- drives do not generally support this command.
-
-
- Media Control Command - "GetStatus"
- Syntax:
- MediaControl <channel>, "GetStatus",
- "DeviceType|PlayStatus|DoorStatus|
- DiscType|DiscSize|DiscSide"
-
- This command enables you to determine the status of a device connected
- to the specified channel. The third parameter determines what type of
- status is returned in the global variable MediaResult.
-
-
- Media Control Command - "GetTimes"
- Syntax:
- MediaControl <channel>, "GetTimes",
- "ElapsedTrack|RemainTrack|ElapsedDisc|
- RemainDisc|TotalDisc|TotalFrames|Tracks"
-
- This command returns information about the currently playing media
- including total time, remaining time, starting and ending track
- numbers, and total frames. Time is returned in the form "hh hours, mm
- minutes, ss seconds."
-
-
- Media Control Command - "JogBackward"
- Syntax:
- MediaControl <channel>, "JogBackward",
- "InChapters|InFrames|InTime", <amount>
-
- This command moves the specified device backward. If moving by
- chapter or frame, <amount> contains the number of frames or chapters
- to move. If moving backward in time, <amount> contains the amount of
- time in the form "hh hours, mm minutes, ss seconds."
-
-
- Media Control Command - "JogForward"
- Syntax:
- MediaControl <channel>, "JogForward",
- "InChapters|InFrames|InTime", <amount>
-
- This command moves the specified device forward. If moving by chapter
- or frame, <amount> contains the number of frames or chapters to move.
- If moving forward in time, <amount> contains the amount of time in the
- form "hh hours, mm minutes, ss seconds."
-
-
- Media Control Command - "Pause"
- Syntax:
- MediaControl <channel>, "Pause"
-
- This command will put the device specified by <channel> into pause
- mode if it is currently playing. Playing can be resumed with the Play
- command.
-
-
- Media Control Command - "Play"
- Syntax:
- MediaControl <channel>, "Play"
-
- This command starts the device playing forward at normal play speed.
-
-
- Media Control Command - "Record"
- Syntax:
- MediaControl <channel>, "Record"
-
- This command initiates record mode if the specified device has that
- capability.
-
-
- Media Control Command - "Remote"
- Syntax:
- MediaControl "Remote"
-
- This command creates and displays a movable window from which you can
- perform many of the basic Media Control commands. It will remain open
- and active until you click its close box, close it from HyperTalk, or
- exit HyperCard. This window can be used to control interactive media
- devices while in other stacks. Commands are sent to the channel
- specified by the MediaChannel global variable.
-
-
- Media Control Command - "ScanBackward"
- Syntax:
- MediaControl <channel>, "ScanBackward"
-
- This causes the device connected to the specified channel to scan
- backward. The results of this command are device dependent. Some
- devices, notably the Apple CDSC drive, will scan backward until
- stopped with another command. Many laserdisc players will scan a
- short distance and stop.
-
-
- Media Control Command - "ScanForward"
- Syntax:
- MediaControl <channel>, "ScanForward"
-
- This causes the device connected to the specified channel to scan
- forward. The results of this command are device dependent. Some
- devices, notably the Apple CDSC drive, will scan forward until stopped
- with another command. Many laserdisc players will scan a short
- distance and stop.
-
-
- Media Control Command - "SearchTo"
- Syntax:
- MediaControl <channel>, "SearchTo",
- "InChapters|InFrames|InTime",
- <location>
-
- This command moves the specified device to <location>. If moving by
- chapter or frame, <location> contains the frame or chapter number
- requested. If "InTime" is specified, <location> contains the time
- requested in the form "hh hours, mm minutes, ss seconds."
-
-
- Media Control Command - "SetSpeed"
- Syntax:
- MediaControl <channel>, "SetSpeed", <fps>
-
- This causes the connected device to play at the specified number of
- frames per second <fps>. The device will play at this speed the next
- time it receives a play command. The frame speed is reset to normal
- (30 fps) after each play command. Use the GetSpeeds command to
- determine what speeds are available for a particular device.
-
-
- Media Control Command - "Stop"
- Syntax:
- MediaControl <channel>, "Stop"
-
- This command stops the device connected to the specified channel.
- After this command, some devices will resume play at the current
- location while others will return to the beginning of the media.
-
-
- Media Control Command - "StopAt"
- Syntax:
- MediaControl <channel>, "StopAt", "InChapters|InFrames|InTime",
- <stopLoc>
-
- This command sets the location at which the specified device will stop
- playing. If setting the stop location to a chapter or frame,
- <stopLoc> contains the frame or chapter number. If setting the stop
- location to a particular time, <stopLoc> contains the time in the form
- "hh hours, mm minutes, ss seconds."
-
-
- Media Control Command - "VideoOverlay"
- Syntax:
- MediaControl "VideoOverlay", "on|off"
-
- This command enables or disables the video overlay feature of the
- Apple II Video Overlay Card.
-
-
-
-
-
- Cards in the Media Control Stack
- The following are screen shots of the five cards in the MC stack.
-
-
- Open File "Media.2" to see Figure 2 - Media Control Stack Menu Card
-
-
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- Open File "Media.3" to see Figure 3 - Media Control Stack Commands Card
-
-
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- Open File "Media.4" to see Figure 4 - Media Control Stack ReadyMade Buttons Card
-
-
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- Open File "Media.5" to see Figure 5 - Media Control Stack Video Overlay Card
-
-
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- Open File "Media.6" to see Figure 6 - Media Control Stack Information Card
-
-