Add mobot.mk Makefile to capture custom build steps

app/meson.build

@@ -25,14 +25,29 @@ src = [
     'src/util/str_util.c'
 ]
 
+cc = meson.get_compiler('c')
+
 if not get_option('crossbuild_windows')
 
+    libdir = get_option('local_libav')
+    if libdir != ''
+        lib_avformat = cc.find_library('avformat', dirs : libdir)
+        lib_avcodec = cc.find_library('avcodec', dirs : libdir)
+        lib_avutil = cc.find_library('avutil', dirs : libdir)
+        lib_swscale = cc.find_library('swscale', dirs : libdir)
+    else
+        lib_avformat = dependency('avformat')
+        lib_avcodec = dependency('avcodec')
+        lib_avutil = dependency('avutil')
+        lib_swscale = dependency('swscale')
+    endif
+
     # native build
     dependencies = [
-        dependency('libavformat'),
-        dependency('libavcodec'),
-        dependency('libavutil'),
-        dependency('libswscale'),
+        lib_avformat,
+        lib_avcodec,
+        lib_avutil,
+        lib_swscale,
         dependency('libpng'),
         dependency('sdl2'),
     ]
@@ -76,8 +91,6 @@ else
 
 endif
 
-cc = meson.get_compiler('c')
-
 if host_machine.system() == 'windows'
     src += [ 'src/sys/win/command.c' ]
     dependencies += cc.find_library('ws2_32')

meson_options.txt

@@ -6,3 +6,4 @@ option('portable', type: 'boolean', value: false, description: 'Use scrcpy-serve
 option('hidpi_support', type: 'boolean', value: true, description: 'Enable High DPI support')
 option('server_debugger', type: 'boolean', value: false, description: 'Run a server debugger and wait for a client to be attached')
 option('server_debugger_method', type: 'combo', choices: ['old', 'new'], value: 'new', description: 'Select the debugger method (Android < 9: "old", Android >= 9: "new")')
+option('local_libav', type: 'string', value: '', description: 'Path to local installation of libav (ffmpeg)')

mobot.mk

@@ -0,0 +1,32 @@
+# Mobot makefile
+# Build the Mobot version of scrcpy with Mobot's FFmpeg
+#  make -f mobot.mk
+
+.DEFAULT_GOAL := scrcpy
+
+build-ffmpeg:
+	git clone https://github.com/team-mobot/FFmpeg.git build-ffmpeg
+
+AVLIBS:=build-libav/lib/libavformat.a build-libav/lib/libavcodec.a build-libav/lib/libavutil.a build-libav/lib/libswscale.a
+$(AVLIBS): build-ffmpeg
+	# Build Mobot version of FFmpeg and install in subdir libav
+	cd build-ffmpeg && \
+	git checkout encode-png-metadata && \
+	./configure --prefix="../build-libav" \
+				--pkg-config-flags="--static" \
+				--extra-libs="-lpthread -lm" \
+				--enable-gpl --enable-nonfree \
+				--disable-bsfs --disable-filters \
+				--disable-encoders --enable-encoder=png \
+				--disable-decoders --enable-decoder=h264 \
+				--enable-libx264 && \
+	make install-libs install-headers
+
+build-app:
+	meson build-app --buildtype release --strip -Db_lto=true \
+		-Dlocal_libav=${PWD}/build-libav/lib \
+		-Dprebuilt_server=/usr/local/share/scrcpy/scrcpy-server
+
+scrcpy: build-app $(AVLIBS)
+	ninja -Cbuild-app
+	cp build-app/app/scrcpy .