RaspberryPi WebCamera Hardware Encode Sample

- UVC Camera
- Stole v4l2uvc.h and v4l2uvc.c code from uvccapture project
- RaspberryPi's Hardware Encode support color format OMX_COLOR_FormatYUV420PackedPlanar
- Encode each raw frame with h264

1. Detect UVC Web Camera
sudo apt-get install v4l-utils
v4l2-ctl  --all

root@raspberrypi:/opt/vc/src/hello_pi/raspi_camera_hardware_encode# v4l2-ctl  --all
Driver Info (not using libv4l2):
        Driver name   : uvcvideo
        Card type     : FULL HD 1080P Webcam
        Bus info      : usb-bcm2708_usb-1.2
        Driver version: 3.6.11
        Capabilities  : 0x04000001
                Video Capture
                Streaming
Format Video Capture:
        Width/Height  : 320/240
        Pixel Format  : 'YUYV'
        Field         : None
        Bytes per Line: 640
        Size Image    : 153600
        Colorspace    : SRGB
Crop Capability Video Capture:
        Bounds      : Left 0, Top 0, Width 320, Height 240
        Default     : Left 0, Top 0, Width 320, Height 240
        Pixel Aspect: 1/1
Video input : 0 (Camera 1: ok)
Streaming Parameters Video Capture:
        Capabilities     : timeperframe
        Frames per second: 30.000 (30/1)
        Read buffers     : 0

My UVC camera supports "320x240" YUYV format.

2. get source code from github, compile it
On your raspberrypi, enter the following directory:
cd /opt/vc/src/hello_pi

git clone https://github.com/yulin724/raspi_camera_hardware_encode.git

make

3. run it
./hello_encode.bin output.h264

4. play video file in vlc
You can download VLC player on Windows or Linux, then play the output.h264 file in it.