set HDMI EDID before starting ustreamer (#179)

* build docker image

* Push each image to an user github registry.
It can be used during development for testing.

* set HDMI EDID before starting ustreamer

* Update README.md

pkg/docker/Dockerfile.alpine

@@ -18,13 +18,17 @@ RUN apk add --no-cache \
 		libjpeg-turbo \
 		libevent \
 		libgpiod \
-		libbsd
+		libbsd \
+		v4l-utils
 
 WORKDIR /ustreamer
 COPY --from=build /build/ustreamer/src/ustreamer.bin ustreamer
 
+RUN wget https://raw.githubusercontent.com/pikvm/kvmd/master/configs/kvmd/tc358743-edid.hex -O /edid.hex
+COPY pkg/docker/entry.sh /
+
 EXPOSE 8080
-ENTRYPOINT ["./ustreamer", "--host=0.0.0.0"]
+ENTRYPOINT ["/entry.sh"]
 CMD ["--dv-timings", "--format", "UYVY"]
 
 # vim: syntax=dockerfile

pkg/docker/entry.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -e
+
+[ -z "$NO_EDID" ] && {
+	[ -n "$EDID_HEX" ] && echo "$EDID_HEX" > /edid.hex
+	while true; do
+		v4l2-ctl --device=/dev/video0 --set-edid=file=/edid.hex --fix-edid-checksums --info-edid && break
+		echo 'Failed to set EDID. Reetrying...'
+		sleep 1
+	done
+}
+
+./ustreamer --host=0.0.0.0 $@