HDMI CEC

• Consumer Electronics Control
• 透過 HDMI 控制電視
• CEC 是傳輸，使用 DDC 

USB to CEC Adapters：透過 USB 控制 CEC-enabled devices.

一些 HDMI-CEC 指令

• One Touch Play：單鍵播放
• System Standby：所有連接的設備 standby
• Preset Transfer: transfers the tuner channel setup to another TV set
• One Touch Record：單鍵錄影
• Timer Programming: allow one device (e.g. a TV set or HTPC) to set the timer programming of another (e.g. a PVR/DVR or DVD-recorder)
• System Information: checks all components for bus addresses and configuration
• Deck Control: playback control
• Tuner Control: control the tuner of another device
• OSD Display: use the OSD of the TV set to display text
• Device Menu Control: use the menus of another device
• Routing Control: control the switching of signal sources
• Remote Control Pass Through: pass through remote control commands
• Device OSD Name Transfer: transfer the preferred device names to the TV set

顯示器使用 physical 位址 0.0.0.0 及 logical 位址 0
所有啟用 CEC 的設備會有 physical 及 logical 位址，而非 CEC 裝置只有 physical 位址。Physical 位址是基於設備相對於 root 位置產生。例如：接到 TV 的 HDMI 1 的 A/V receiver physical address 會是 1.0.0.0。接到 A/V receiver 的 HDMI 1 輸入的設備 physical 位址會是 1.1.0.0，接到 HDMI 2 輸入會是 1.2.0.0。

邏輯位址依據功能。
* 0：顯示器
* 15：廣播

When the HDMI device menu is brought up on the display (On a Sony KDL46EX720, this is achieved by pressing the Sync Menu button), the display sends a broadcast over the CEC wire to all the downstream devices. It then collects the responses arriving over the CEC wire and presents the user with a list of CEC enabled devices. Choosing one of them ensures that future remote key presses are transferred by the TV to that particular address.

深入了解：QuantumData's excellent [CEC whitepaper](http://www.quantumdata.com/pdf/CEC_White_Paper.pdf) 及 CEC 規範

Media center systems XBMC 和 MythTV 透過 libCEC 支援 HDMI-CEC; libCEC 在 v1.8.0 支援 Raspberry Pi。
http://elinux.org/CEC_(Consumer_Electronics_Control)_over_HDMI
[HDMI CEC protocol](http://kezeodsnx.pixnet.net/blog/post/28219224)
[HDMI CEC 的一點補充](http://www.cash.idv.tw/wordpress/?p=8411)
[CEC Addressing - Quantum Data](www.quantumdata.com/pdf/CEC_HDMI_Conference_Final.pps)

BRAVIA Sync