Bill Chen Email & Phone Number

New York, Ny, Us

1.WebRTC stack maintenance2.ReSIProcate SIP stack maintenance3.Use WebRTC PeerConnection to replace media functions in SIP stack

Fuzhou, Fj | Fujian, Cn

1.New Android platform bring up for KTV set-top box•Experience on platform of Sigma Designs, Broadcom, Allwinner, Rockchip, MStar, Amlogic, Realtek•Modify Kernel driver / HAL for hardware change•Customize Android framework2.Verify and optimize system to fit with functionality and performance requirement of our KTV business application.•Minimize audio latency, <50ms from record to playback, kernel driver optimization •Additional audio record source for App to record from HDMI input port•Hardware Video encoder and decoder run at same time, using mutex in kernel driver and Android media codec.3.Pre-research of technical solution to meet new functional requirements•Low latency video broadcast, using Live555•Cross platform media player based on VLC•Echo cancellation using WebRTC so that can use Mic. of mobile phone for singing•Voice command reorganization using CoreNLP •Put whole firmware inside hard disk and eliminate EMMC chip

Los Angeles, California, Us

1.Learning project of Directshow disc navigation filter•dslibdvdnav and dslibblurray in sourceforge. •dslibdvdnav is just a wrapper libdvdnav•dslibblurray based on libblurray, but had great improvement on BD-J implement, most work on BD-J had been pick by libblurray2.Port Sony Xepra S to Android Lollipop & Marshmallow.•XDA thread: https://forum.xda-developers.com/xperia-s/s-development/pure-aosp-lollipop-t2940839•Find out and fix the famous Android 5.0.x ColorFade memory leak bug, https://issuetracker.google.com/issues/37010796#comment178• Increasing system available memory by using CMA in kernel•Implement pickup motion detection and twist wrist to wakeup using acceleration sensor3.Port Xiaomi RedMi Note 3 Pro to Android Nougat & Oreo•XDA thread: https://forum.xda-developers.com/redmi-note-3/development/universal-camera-binary-patch-kenzo-n-t3572779•Fix qcom camera bug in binary when upgrading to Nougat•Fix goodix fingerprint support in kernel and HAL•Fix Aosp bug of Wifi Display, https://github.com/LineageOS/android_frameworks_av/commit/9e5f47722e13dca8035340b41e78737987984886 •Solve BT SCO device paring problem when upgrading to Oreo

Fuzhou, Fuj, Cn

Member of a small startup team to co-operate with the company that produce LED device to expand to LED display and LED light product line. Responsible for design and production of LED display product line.•LED badge that sale over the world. https://www.google.com/search?q=led+badge+keyshine•Oil Price Sign that sale to BP Africa

Fuzhou, Fuj, Cn

1.Complete Portable MP3 player firmware independently•ARM/DSP based •ThreadX RTOS porting, split interrupt to bottom and top part and support context switch•Basic NAND FTL design and FAT FS implement•USB slave stack porting, USB Mass Storage class implement •Fixed point CELP voice codec porting, Fixed point musepack decoder implement •IIR Equalizer design•Basic GUI framework implement , 2D Raster, dot matrix font renderer•GUI on LCD2.Portable Hard Disk Video player system software development, team leader•MIPS based AMD chip, Linux OS•Using of buildroot•Kernel customize, fasten USB reset when peripheral lost response to fix hardware bug of USB to IDE bridge chip•Design firmware backup, recovery and upgrade method•PTP fuse driver, so can backup files in camera to hard disk•Qt GUI framework porting