Difference between revisions of "Media key"
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| [[Apple Aluminium Keyboard]] A1243 | | [[Apple Aluminium Keyboard]] A1243 | ||
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| [[Cooler Master QuickFire Rapid|CMStorm QuickFire Rapid]] | | [[Cooler Master QuickFire Rapid|CMStorm QuickFire Rapid]] | ||
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| KeyCool 108 | | KeyCool 108 | ||
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| (Windows lock) | | (Windows lock) | ||
| + | | Lock Sleep, Calculator, ... ? | ||
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| + | | Matias Quiet Pro Mini (PC) | ||
| + | | Rewind | ||
| + | | Forward | ||
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| − | | | + | | Play/Pause on Esc, Mute Volume Up/Down on Fn-Arrow key |
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| Max Keyboard Blackbird | | Max Keyboard Blackbird | ||
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Revision as of 12:47, 18 December 2013
A Media key is a key with a special purpose for a specific type of applications or operating system functions. Normally, these functions are concerned with media playback, but the term has been used for other functions as well.
A media key can be a dedicated key, or another key can act like a media key in conjunction with the Fn key. Some USB keyboards contain also a knob or roller, usually for volume control.
Gallery
Audio control panel on the Y-RJ20
Function-key mappings
On many keyboards, media keys are dedicated keys with no other function.
On some keyboard, media key functions are on Function keys when holding a Fn key.
On the Apple aluminium keyboards with MacOS, the default behaviour is the reverse: numbered function keys are available on the media keys when holding down Fn. This behaviour can be switched in MacOS.
On some PC keyboards from Microsoft, the Fn "key" is not a modifier key but a toggle switch.
| Keyboard | Fn-F1 | Fn-F2 | Fn-F3 | Fn-F4 | Fn-F5 | Fn-F6 | Fn-F7 | Fn-F8 | Fn-F9 | Fn-F10 | Fn-F11 | Fn-F12 | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apple Aluminium Keyboard A1243 | Brightness Down | Brightness Up | Exposé / Mission Control | Dashboard / Launchpad | Rewind | Play/Pause | Fast Forward | Mute | Volume Down | Volume Up | Eject, F13..F19 | ||
| CMStorm QuickFire Rapid | Play/Pause | Stop | Previous track | Next track | Mute | Volume Down | Volume Up | ||||||
| Ducky G2Pro/Shine | Mute | Volume Down | Volume Up | Play/Pause | Stop | Previous track | Next track | Calculator Computer Email Home/Browser | |||||
| iOne (Func KB-460, QPad MK-50 etc.) | Mute | Volume Down | Volume Up | Play/Pause | Previous track | Next track | |||||||
| KeyCool 84, KeyCool 87 | Computer | Home/Browser | Calculator | Media Player | Previous Track | Next Track | Play/Pause | Stop | Mute | Volume Down | Volume Up | (Windows lock) | |
| KeyCool 108 | Computer | Home/Browser | Media Player | Previous Track | Next Track | Play/Pause | Stop | Mute | Volume Down | Volume Up | (Windows lock) | Lock Sleep, Calculator, ... ? | |
| Matias Quiet Pro Mini (PC) | Rewind | Forward | Play/Pause on Esc, Mute Volume Up/Down on Fn-Arrow key | ||||||||||
| Max Keyboard Blackbird | Mute | Volume Down | Volume Up | Play/Pause | Previous Track | Next Track | |||||||
| Mionix Zibal 60 | Mute | Volume Down | Volume Up | Play/Pause | Stop | Previous Track | Next Track | ||||||
| SteelSeries 6GV2 | Mute | Volume Down | Volume Up | Play/Pause | Previous Track | Next Track |
Protocol
Media keys usually emit distinct codes to the host.
USB
In the USB HID ("Human Interface Device") standard, while most key codes are in the "Keyboard/Keypad" usage page (0x07), most most media keys are in "Consumer" usage page (0x0C). System control keys (Power, Sleep, Wake) are in the "Generic Desktop" usage page (0x01).
The "Consumer Usage Page" has also codes for linear relative values for volume control, bass and treble. While it may appear to be analogue, the knob or roller is usually connected to a rotary encoder. The values are relative to the volume level set by the user in the operating system and application software. If the controls had absolute values, they would have needed to be motorized and under computer control, which is something that the USB HID specification does not support.
The controls in each Usage Page are transmitted in a separate packet. Therefore, media keys may have separate rollover characteristics from regular keys.
PS/2
For PS/2, Microsoft has standardized media key scancodes for Windows.
Some vendors have used their own codes that have been activated first after having received a "magic" code from the host's keyboard driver.
Codes
There are more codes in the USB standard that those below, but not all are supported by major operating systems and apps. [1] [2] [3] [4].
Values are in hexadecimal.
| Function | USB | PS/2 (set 2) | OS support | ||||||
|---|---|---|---|---|---|---|---|---|---|
| System | Page | Code | Type | Make | Break | Windows | Mac | X | Sun |
| Power | 01 | 81 | One-shot | E0 37 | E0 F0 37 | Windows 95 | X | ||
| 07 | 66 | One-shot | Mac | X | Sun | ||||
| Sleep | 01 | 82 | One-shot | E0 3F | E0 F0 3F | Windows 95 | |||
| Wake | 01 | 83 | One-shot | E0 5E | E0 F0 5E | Windows 95 | |||
| Media | Page | Code | Type | Make | Break | Windows | Mac | X | Sun |
| Next Track | 0C | B5 | One-shot | E0 4D | E0 F0 4D | Windows | Mac | X | |
| Previous Track | 0C | B5 | One-shot | E0 15 | E0 F0 15 | Windows | Mac | X | |
| Stop | 0C | B7 | One-shot | E0 3B | E0 F0 3B | Windows | Mac | X | |
| Eject | 0C | B8 | One-shot | Mac | |||||
| Play / Pause | 0C | CD | One-shot | E0 34 | E0 F0 34 | Windows | Mac | X | |
| Volume (knob) | 0C | E0 | Linear | Windows 98 | |||||
| Mute | 0C | E2 | On/off | E0 23 | E0 F0 23 | Windows 98 | Mac | X | |
| 07 | 7F | One-shot | Sun | ||||||
| Bass (knob) | 0C | E3 | Linear | Windows 2000 | |||||
| Treble (knob) | 0C | E4 | Linear | Windows 2000 | |||||
| Bass Boost | 0C | E5 | On/off | Windows 98 | |||||
| Loudness | 0C | E7 | On/off | Windows 2000 | |||||
| Volume Up | 0C | E9 | Re-trigger | E0 32 | E0 F0 32 | Windows 98 | Mac | X | |
| 07 | 80 | One-shot | Sun | ||||||
| Volume Down | 0C | EA | Re-trigger | E0 21 | E0 F0 21 | Windows 98 | Mac | X | |
| 07 | 81 | One-shot | Sun | ||||||
| Bass Up | 0C | 0152 | Re-trigger | Windows 2000 | |||||
| Bass Down | 0C | 0153 | Re-trigger | Windows 2000 | |||||
| Treble Up | 0C | 0154 | Re-trigger | Windows 2000 | |||||
| Treble Down | 0C | 0155 | Re-trigger | Windows 2000 | |||||
| Launch application | Page | Code | Type | Make | Break | Windows | Mac | X | Sun |
| Media Player | 0C | 0183 | Selector | E0 50 | E0 F0 50 | Windows | |||
| 0C | 018A | Selector | E0 48 | E0 F0 48 | Windows | ||||
| Calculator | 0C | 0192 | Selector | E0 2B | E0 F0 2B | Windows | |||
| My Computer | 0C | 0194 | Selector | E0 40 | E0 F0 40 | Windows | |||
| Web browser | Page | Code | Type | Make | Break | Windows | Mac | X | Sun |
| Search | 0C | 0221 | Selector | E0 10 | E0 F0 10 | Windows | |||
| Browser/Home | 0C | 0223 | Selector | E0 3A | E0 F0 3A | Windows | |||
| Back | 0C | 0224 | Selector | E0 38 | E0 F0 38 | Windows | |||
| Forward | 0C | 0225 | Selector | E0 30 | E0 F0 30 | Windows | |||
| Stop | 0C | 0226 | Selector | E0 28 | E0 F0 28 | Windows | |||
| Refresh | 0C | 0227 | Selector | E0 20 | E0 F0 20 | Windows | |||
| Bookmarks | 0C | 022A | Selector | E0 18 | E0 F0 18 | Windows | |||
References
- ↑ Universal Serial Bus (USB): HID Usage Tables,10/28/2004,Version 1.12
- ↑ Windows Platform Design Notes: Keyboard Scan Code Specification, Revision 1.3a; revised March 2000. Retrieved from Archive: Key Support, Keyboard Scan Codes, and Windows on 2013-09-19
- ↑ USB HID to PS/2 Scan Code Translation Table. Retrieved from Archive: Key Support, Keyboard Scan Codes, and Windows on 2013-09-19
- ↑ Sun USB media key mappings, extracted from looking at the source code of type5usb.
