Fundamental features

1. What is Carplay?
• User can operate Apple Device from Head Unit(HU) , using Apple
provided UI screen. Apple Device shows simplified UI on the HU display
and it uses HU devices while in carplay as below
• HU display for the rendering Carplay mode UI. HU speaker for rendering audio. HU MIC for the Phone call/voice commands
• HU Touch Input, Rotary Knob/Buttons for the UI Navigation and selection.
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2. What functionality available in Carplay
• All the important Apple Phone’s functionality is
available in carplay mode.
• Phone calling
• Music playback
• Navigation
• Messages
• Siri for voice commands
• Apart from the above, it can support any Iphone native,
3rd party Apps (like spotify internet radio etc) which are
safe while driving.
• 3rd Party Apps needs certification from Apple in order
to have Apps visible in Carplay mode.
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3. Apps Support in Carplay Mode
• Is all iOS APPs available in Carplay Mode?
• Apple has complete control over enabling of Apps in the Carplay mode.
Enabling/Disabling Apps can not be controlled from Head Unit Software
• Infrastructure allows any Apps(including video) supported in iOS can be
made available in Carplay Mode too.
• Apple can decide APP based on the security
• How the Apps are selected and controlled from HU?
• Only the touch co-ordinates are sent to Apple Device from HU. The
complete UI and selection of Apps done by Apple Device Software
• Is it possible to allow OEM APPs(provided by Ford etc) in the
Carplay mode
• Unknown from specification
• To be discussed with Apple
• Usage of Siri in Carplay Mode (by voice commands)
• Phone Calling , select and play music, hear and compose text messages,
getting directions
• Notifications, remainders, calendar informations and etc
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4. Entry/Exit for Carplay Mode
• Entry to Carplay Mode
• Carplay Link to Apple Device is established immediately after
Physical Connection
• So it will not require user intervention to enable Carplay
Mode after device connection.
• User can see the carplay screen by pressing “Soft or Hard”
Button in the HU HMI after the device connection.
• Exit from Carplay Mode
• Exit from Carplay mode happens during Physical
Disconnection
• However user can switch from carplay screen to other
screens (say FM) using soft button on the carplay screen.
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5. Carplay co-existence with Bluetooth ,
USB(iAP)
• Apple devices supports the following different
protocols/transport
• Carplay over USB (Wi-Fi in future)
• all the phone features including phone, music etc
• Over Bluetooth
• phone
• music streaming
• iAP over USB
• music streaming
• iOS APP communication
• Apple devices uses Carplay link for the Phone , Music
when in car play mode. So Bluetooth (HFP,
A2DP,AVRCP profiles ) and iAP over USB can NOT be
used in parallel with Carplay mode.
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6. HW Requirements
• Transport
• USB OTG
• Role switch from Host to Device mode should be possible dynamically
• Should support 100mbps thoruhput
• WiFi ( Apple not enabled yet)
• Access point support with 802.11b/g/n
• Separate Antenna for WiFi and Bluetooth
• Quality of service support(voice, video, best effort, background)
• Display
• Minimum resolution of touch display is 800x480, with 30hz
refresh support, 18 bits per pixel
• Siri Button
• Must have tactile button for Siri. Soft button is NOT allowed.
• Preferably in steering wheel
• Carplay Button (optional)
• Phiscal button to switch to Carplay screen. Soft button is also
okay
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7. HW Requirements
• Mic Input
• Mic input at 8,16,24kHz should be possible
• Audio output
• Output output at 44.1,48kHz should be possible
• Sensors(GPS)
• Car must provide the GPS or vechicle speed or Gyro data to
the Apple Devices
• User Inputs
• Touch Input
• Knob (for navigation and selection)
• Buttons (play controls, phone keys etc)
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8. Audio ,Video Stream Details
• Video
• Video is sent from the Apple Device in H.264 format.
• Audio
• All the audios are sent in LPCM format
• Face Time Audio
• 24kHz, mono, 16bit,Full Duplex (Mic input, Speaker O/P)
• Telephony Audio
• 8,16kHz, mono, 16bit, Full Duplex (Mic input, Speaker O/P)
• Siri Audio
• 24kHz, mono, 16bit ,Full Duplex (Mic input, Speaker O/P)
• Music Audio,
44.1, 48kHz Output, 16&24bit, Stereo
• Alerts(Navigation, Message etc)
44.1, 48kHz Output, 16&24bit, Stereo
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9. Technology Comparison
Carplay Vs Mirror Link Vs Google
Automotive Link (draft)
Factors Carplay MirrorLink Google Automotive
Link
Video Format Compressed Video(
H.264)
1.Un-Compressed Video (R,G,B) for
VNC/HSML
2.MPEG2 for Mirracast
TBD
Audio Format LPCM LPCM TBD
Audio for various Alerts (
like direction message
from Navigation) while HU
in other sources like FM
Supported.
Alerts audio sent in separate channel
from Apple Device. So it can be
mixed with any source audio like FM
Only one audio output from Phone is
possible. So Audio can be heard while
any App is selected in the Mirror Link
mode
TBD
Transport USB OTG(or)
WiFi Access Point mode (still under
work)
USB Host (or)
WiFi Direct (for mirracast)
TBD
Phone Audio (MIC and
speaker)Transport
Phone Audio ( both MIC and speaker)
sent via USB in carplay mode
Following options are feasible for phone
audio
1.via Bluetooth HF profile
2.via USB
But none of existing mobile supports
Option #2
TBD
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10. Technology Comparison
Carplay Vs Mirror Link Vs Google
Automotive Link (draft)
Factors Carplay MirrorLink Google Automotive Link
Drive Mode &
Park Mode
Taken care automatically as the vehicle
speed information is sent to Apple
Device. To be verified.
HU software need to manage the
mode switching based on the
speed.
TBD
Customization of Screen
based on the vehicle
Apple device can customize the screen
based on the vehicle info (like right hand
drive, night mode etc)
No provision for such a
customization?
TBD
OS Supported Supported only in Apple Device/iOS Any device/OS can support
carplay.
Currently supported in Android,
Windows phones
Allowed only from
Android Phone?
App Listing Selection Managed by the Phone Managed by HU software. TBD
Availability of OEM
specific APPs Unknown OEM Specific APPs can be available
in Mirror Link Mode
TBD
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11. Carplay SW Architecture in OpenAirI1.1
(draft)
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12. Carplay Demo Videos
• From AllGo
CarPlay+RACE on iMX6/Linux:
https://www.youtube.com/watch?v=gp2lPZAdso0
nVidia Android: https://www.youtube.com/watch?v=fNIel--lpN0
• From Web
http://www.techstage.de/news/Volvo-und-Daimler-zeigen-Apple-
CarPlay-Integration-2133776.html
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