Mimic is a tiny proof-of-concept of doing android device screen mirroring to a
desktop over WiFi. It consists of two separate ARM binaries: a modified AOSP
screenrecord binary that spews out raw h264 on STDOUT and a small RTSP/RTP
server written in Go that broadcasts raw h264 from STDIN.
Disclaimer: this is a huge hack. Don't expect it to work reliably, if at all.
You're using either Linux or OS X, you have vlc and ruby and you have a single device attached over adb where said device is on the same LAN as your computer:
cd mimic/checkout/dir
ruby mimic.rbThis script will reconnect adb over tcp and start mimic (so you can untether once mirroring works).
The other way is to manually retrace the steps that the ruby scripts takes:
# installing binaries
cd mimic/checkout/dir
adb -d push bin/screenrecord /data/local/tmp/screenrecord
adb -d push bin/mimic /data/local/tmp/mimic
adb -d chmod 700 /data/local/tmp/screenrecord
adb -d chmod 700 /data/local/tmp/mimic
# connecting adb over tcpip
DEVICE_IP=`adb shell getprop dhcp.wlan0.ipaddress` # if this fails you'll need
# to get the IP in some
# other way
# start adb in tcpip mode on the device
adb -d tcpip 5555
# connect
adb connect $DEVICE_IP:5555
# ok to disconnect usb now, lets start mimic
BITRATE=8000000
TIMELIMIT=1800
adb -s "$DEVICE_IP:5555" shell "/data/local/tmp/screenrecord \
--bit-rate $BITRATE --time-limit $TIMELIMIT --raw stdout \
| /data/local/tmp/mimic"
# it's running! Connect with VLC
vlc rtsp://$DEVICE_IP:5554
# once done, disconnect the tcpip adb
adb disconnect $DEVICE_IP:5555To build from source you'll need to check out AOSP, apply the patch in
diff/screenrecord/frameworks_av.diff and compile screenrecord from source:
cd aosp/checkout/dir
pushd frameworks/av
cat mimic/checkout/dir/diff/screenrecord/frameworks_av.diff | patch
popd
make screenrecord
cp out/target/product/generic/system/bin/screenrecord mimic/checkout/dir/bin/To build the RTSP/RTP server you'll need to bootstrap go for Linux/ARM and then build:
cd $GOROOT/src
GOOS=linux GOARCH=arm ./make.bash
cd mimic/checkout/dir
GOOS=linux GOARCH=arm go build -o bin/mimicCurrently there's a slight latency in the order a few seconds (hence the name, it looks like the desktop mirror is "mimicing" the device).
There's also a few packet / NALU too large warnings in VLC.
Plans are to look into both of these issues.
Standard Apache 2.0. See the license file.