I mean "camera hal from vendor". You can check the camera hal's position in the 
following diagaram.
 
https://github.com/sotaroikeda/firefox-diagrams/blob/master/dom/dom_camera_FirefoxOS_1_1.pdf?raw=true

The following is a link to another diagrams.
 https://github.com/sotaroikeda/firefox-diagrams/wiki/Firefox-Diagrams


I re-read your log. From the following, android media server seems crashed 
because of segmentation fault after CameraHardware::inPreviewThread() was 
called.
At first, you might better to analyze it like using GDB.

> W/CameraHardware(  409): int android::CameraHardware::inPreviewThread(): 
> return from wait
> F/libc    (  409): Fatal signal 11 (SIGSEGV) at 0x40fc0c00 (code=1)
> I/DEBUG   (   75): *** *** *** *** *** *** *** *** *** *** *** *** *** *** 
> *** ***
> I/DEBUG   (   75): Build fingerprint: 'unknown'
> I/DEBUG   (   75): pid: 409, tid: 497  >>> /system/bin/mediaserver <<<
> I/DEBUG   (   75): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 
> 40fc0c00

sotaro

----- Original Message -----
From: [email protected]
To: [email protected]
Sent: Thursday, November 28, 2013 10:57:22 PM
Subject: Re: [b2g] Ascend G300 - camera not working and scaling UI

Hi Sotaro Ikeda,
Sorry, I'm not really understand. What do mean by saying "android camera hal"? 
Is that libcamera_client and libcameraservice of Android or lib camera hal from 
vendor?
Could you more clarify on this too :"the USB Webcam seems not support android 
camera hal"

Many thanks.

On Friday, November 29, 2013 12:30:12 AM UTC+7, Sotaro Ikeda wrote:
> Hi
> 
> 
> B2G's camera expect android camera hal. From the following error log, the USB 
> Webcam seems not support android camera hal.
> 
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