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Screencasting

Rex Tsai
August 29, 2013

 Screencasting

Rex Tsai

August 29, 2013
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  1. 1
    Screencasting
    Rex Tsai
    [email protected]
    http://nutsfactory.net/
    H4 @ MR Brown
    2013-08-29
    (2013-09-01 updated)

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  2. 2
    Screen mirroring solutions

    AirPlay

    mirroring standard for iOS.

    Miracast/WiDi

    RTP/RTSP

    Chromecast

    DIAL

    WebRTC

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  3. 3
    Apple AirPlay

    Wireless Media Streaming / Screen Mirroring Protocol
    for iOS

    Discovery – Bonjour / zeroconf

    AirPlay service / RAOP (Remote Audio Output Protocol)

    FairPlay for protect screen content and encrypted

    UDP-based, based on RTSP

    Codec - Apple Lossless codec with 44100 Hz and 2 channels
    and H264

    Proprietary protocol, only license audio-streaming to 3rd
    partyies

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  4. 4
    Requirement for hacks

    Understand FairPlay / DRM for screen
    protection

    FairPlay DRM initiation - ‘/fp-setup’

    Video steaming encryption

    AirTunes/AirPlay private/public RSA keys

    Implement the AirPlay receiver server

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  5. 5
    Commerical products of
    AirPlay mirroring

    James Laird reverse-engineered and released the
    private key

    VMLite rPlay for Raspberry Pi and Windows
    – http://www.youtube.com/watch?v=aviPOINM6Bk

    Electroniccolor -
    http://v.youku.com/v_show/id_XNTgwMjQzMTk2.html
    AirParrot - http://www.airsquirrels.com/airparrot/

    AirServer - http://www.airserver.com/

    Hacksugar: Live AirPlay mirroring to Mac from iOS |
    TUAW - The Unofficial Apple Weblog
    – http://www.tuaw.com/2012/02/08/hacksugar-live-airplay-mirroring-to-mac/

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  6. 6
    Micrast/Wireless Display

    Discovery - WiFi Direct (Layer 2 protocol)

    Media Protocol

    RTP

    RTSP

    Available

    Android 4.2

    Windows client available from Intel

    Built-in in Windows 8.1

    Wi-Fi Display Technical Specification 199USD

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  7. 11
    AOSP Miracast Sink

    Android 4.2

    https://github.com/kensuke/How-to-Miracast-on-AOSP/wiki

    https://github.com/kensuke/

    Demo - http://www.youtube.com/watch?v=KNEmaIr3FEg

    Possible to port this feature to Android dongle like mk802

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  8. 12
    Chromecast

    DIscovery And Launch http://www.dial-multiscreen.org/

    Based on UpnP & REST

    WebRTC http://www.webrtc.org/

    Support applications

    YouTube

    Netflix

    Google Play Music

    Google Play Movies & TV

    “Google Cast” Browser plugin available for Windows, Mac OS,
    Linux.
    https://chrome.google.com/webstore/detail/google-cast/boadgeojelhgndaghljhdicfkmllpafd

    Bootloader is hacked
    http://wiki.gtvhacker.com/index.php/Google_Chromecast#Bootloader_Exploit_Package

    Does not work in AP Isolation mode
    https://support.google.com/chromecast/answer/3213084?hl=en

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  9. 13
    Supported Media Types

    Video codecs: H.264 High Profile Level
    4.1, 4.2 and 5, VP8

    Audio decoding: HE-AAC, LC-AAC,
    CELT/OPUS, MP3

    Containers: MP4/CENC, WebM,
    MPEG-DASH, SmoothStreaming

    Level 1 DRM support: Widevine,
    Playready
    https://developers.google.com/cast/supported_media_types

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  10. 16
    Chromecast clone Software

    SINK (Server)

    CheapCast - https://github.com/mauimauer/cheapcast
    – Supported Applications

    ChromeCast

    YouTube

    PlayMovies

    GoogleMusic

    GoogleCastSampleApp

    GoogleCastPlayer

    Fling

    TicTacToe
    – Unstable, Android's WebView does not work well on old device like mk802.

    SOURCE (Clients)

    AirCast

    RemoteCast

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  11. 17
    References

    Unofficial AirPlay Protocol Specification
    http://nto.github.io/AirPlay.html

    Wi-Fi Display Technical Specification v1.0.0
    http://www.wi-fi.org/knowledge-center/published-specifications

    Stream Laptop Content over HDTV with Intel® Wireless Display
    https://www-ssl.intel.com/content/www/us/en/architecture-and-technology/intel-wireless-display.html

    https://www.wi-fi.org/sites/default/files/uploads/wp_Miracast_Industry_20120919.pdf

    DIAL-2ndScreenProtocol-1.6.4.pdf http://www.dial-multiscreen.org/dial-protocol-specification

    Google Cast API https://developers.google.com/cast/

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