Controlling a custom tv_input

[Christophe Dongieux]

Hi,

I'm working on a custom tv_input HAL module, and I can't figure out how to implement correctly a TvInputService/HardwareSession to control it.

My tv_input module is made for controlling a DVB tuner and using the TV_STREAM_TYPE_INDEPENDENT_VIDEO_SOURCE/sideband feature.

On the HAL side, my module declares a device with its device_id and type (TV_INPUT_TYPE_TUNER), and a tv_stream_config_t with a stream_id and TV_STREAM_TYPE_INDEPENDENT_VIDEO_SOURCE type.

On the Java side, I create a class extending TvInputService which overrides onHardwareAdded() for returning a TvInputInfo based on the TvInputHardwareInfo, and creating a HardwareSession in the onCreateSession() method. The HardwareSession returns (in getHardwareInputId()) the hardware input id detected by TvInputHal.

When I enable debug in logs in all the TV framework classes, I see TvInputService complaining about my input hardware id is invalid since the input is not a passthrough.

And if I change the tv input type of the HAL module to TV_INPUT_TYPE_OTHER_HARDWARE, createSessionInternalLocked() in TvInputManagerService is called in loop, which leads to a system restart.

Do you have any suggestion or idea about that?

Best regards,

Christophe.

[Christophe Dongieux]

Ok, it was really tricky :)

- the session has to extend Session and not HardwareSession

- the session has to call acquireTvInputHardware() on the TvInputManager instance with the hardware device_id declared in the tv_input

- with the acquired hardware session, you can call setSurface() which calls open_stream() in the tv_input.

So I am wondering what is the purpose of the HardwareSession class, since that session can only be a Passthrough one, thus not allowing to use a tv_input which is declared as a TV_INPUT_TYPE_TUNER. Maybe some explanation are missing in the documentation.

Best regards,

Christophe.

[Raven Dou]

HDMI  is Passthrough, so it can not be a type of TV_INPUT_TYPE_TUNER , I guess.

http://source.android.com/devices/tv/index.html#passthrough_input_example

在 2014年12月1日星期一 UTC+8下午4:59:29，Christophe Dongieux写道：

[Narrator]

Hi Christophe,

I'm trying to implement tv_input app for tuner and my problem is while overriding onHardwareAdded() in TvInputService, I'm getting error like "TvInputHardwareInfo cannot be resolved to a type"

i have included the v17-leanback suppport library to my project in eclipse, I still face the same problem but I'm not getting any error for TvInputInfo , TvInputService etc types which means that support library is added to my project. 

Am I missing something??

[Christophe Dongieux]

Hi,

onHardwareAdded() and some bunch of other methods are hidden methods ("@hide"). So these methods are not available when using Android SDK.

So you have 2 choices:

- you use reflection to access these methods,

- you develop your app within the android platform.

And FYI, v17-leanback suppport library is not related to this at all.

Good luck with your dev.

Cheers.

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