encodedecode.txt

采集视频信号进行H264压缩并通过UDP传送

NAME
       encodedecode - encode and decode H.264 video

SYNOPSIS
       encodedecode [options...]

DESCRIPTION
       This demo uses the Codec Engine to encode data from the capture device
       (V4L2) using the H.264 algorithm into an intermediate buffer before
       the data is decoded to the display framebuffer.

       The DSP Link and CMEM kernel modules need to be inserted for this demo
       to run. Worst case CMEM pools needed by this demo are 1x1382400 and
       1x202752. Use the script 'loadmodules.sh' to make sure both kernel
       modules are loaded with adequate parameters.

OPTIONS
       -r <resolution>, --resolution <resolution>
             This option sets the resolution of the demo. One of the following
             resolution values must be supplied:

             CIF  - This will capture and display 352x240 on an NTSC system
                    and 352x288 on a PAL system. The image will be centered
                    on the screen.
             ZOOM - This will capture video at 352x240 on an NTSC system and
                    352x288 on a PAL system. After the data has been encoded
                    and decoded back it will be zoomed by the display to D1
                    resolution (720x480 on NTSC and 720x576 on PAL).
             D1   - This will capture and display 720x480 on an NTSC system
                    and 720x576 on a PAL based system.

             If this option isn't supplied the demo defaults to D1.

       -t <seconds>, --time <seconds>
             The number of seconds to run the demo. Defaults to infinite time.

       -h, --help
             This will print the usage of the demo.

EXAMPLE USAGE
       First execute this script to load kernel modules required:
             ./loadmodules.sh

       General usage:
             ./encodedecode -h

       Use ZOOM resolution and quit after 20 seconds:
             ./encodedecode -r ZOOM -t 20

COPYRIGHT
       Copyright (c) Texas Instruments Inc 2005

       Use of this software is controlled by the terms and conditions found in
       the license agreement under which this software has been supplied or
       provided.

KNOWN ISSUES
       Currently for the ZOOM and CIF resolutions an extra memcpy is required,
       as the 'displayWidth' parameter of the TI H.264 decode algorithm isn't
       supported. This causes the ARM CPU load to vary slightly when these
       resolutions are used.

       As the TI H.264 encoder currently doesn't support PAL D1 (720x576), we
       currently show 720x480 also on PAL systems leaving a 96 pixel high
       black border at the bottom of the screen.

CHANGELOG

SEE ALSO
       For documentation and release notes on the individual components see
       the html files in the host installation directory.