Use minimal prebuilt FFmpeg for Windows

On the scrcpy-deps repo, I built FFmpeg 5.1.2 binaries for Windows with
only the features used by scrcpy.

For comparison, here are the sizes of the dll for FFmpeg 5.1.2:
 - before: 89M
 - after: 4.7M

It also allows to upgrade the old FFmpeg version (4.3.1) used for win32.

Refs <https://github.com/rom1v/scrcpy-deps>
Refs <#1753>

app/meson.build

@@ -133,18 +133,12 @@ else
     ffmpeg_bin_dir = meson.current_source_dir() + '/prebuilt-deps/data/' + prebuilt_ffmpeg + '/bin'
     ffmpeg_include_dir = 'prebuilt-deps/data/' + prebuilt_ffmpeg + '/include'
 
-    # ffmpeg versions are different for win32 and win64 builds
-    ffmpeg_avcodec = meson.get_cross_property('ffmpeg_avcodec')
-    ffmpeg_avformat = meson.get_cross_property('ffmpeg_avformat')
-    ffmpeg_avutil = meson.get_cross_property('ffmpeg_avutil')
-    ffmpeg_swresample = meson.get_cross_property('ffmpeg_swresample')
-
     ffmpeg = declare_dependency(
         dependencies: [
-            cc.find_library(ffmpeg_avcodec, dirs: ffmpeg_bin_dir),
-            cc.find_library(ffmpeg_avformat, dirs: ffmpeg_bin_dir),
-            cc.find_library(ffmpeg_avutil, dirs: ffmpeg_bin_dir),
-            cc.find_library(ffmpeg_swresample, dirs: ffmpeg_bin_dir),
+            cc.find_library('avcodec-59', dirs: ffmpeg_bin_dir),
+            cc.find_library('avformat-59', dirs: ffmpeg_bin_dir),
+            cc.find_library('avutil-57', dirs: ffmpeg_bin_dir),
+            cc.find_library('swresample-4', dirs: ffmpeg_bin_dir),
         ],
         include_directories: include_directories(ffmpeg_include_dir)
     )

app/prebuilt-deps/prepare-ffmpeg.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -e
+DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DIR"
+. common
+mkdir -p "$PREBUILT_DATA_DIR"
+cd "$PREBUILT_DATA_DIR"
+
+VERSION=5.1.2-scrcpy
+DEP_DIR="ffmpeg-$VERSION"
+
+FILENAME="$DEP_DIR".7z
+SHA256SUM=93f32ffc29ddb3466d669f7078d3fd8030c3388bc8a18bcfeefb6428fc5ceef1
+
+if [[ -d "$DEP_DIR" ]]
+then
+    echo "$DEP_DIR" found
+    exit 0
+fi
+
+get_file "https://github.com/rom1v/scrcpy-deps/releases/download/$VERSION/$FILENAME" \
+    "$FILENAME" "$SHA256SUM"
+
+mkdir "$DEP_DIR"
+cd "$DEP_DIR"
+
+ZIP_PREFIX=ffmpeg
+7z x "../$FILENAME"
+mv "$ZIP_PREFIX"/* .
+rmdir "$ZIP_PREFIX"

cross_win32.txt

@@ -16,10 +16,6 @@ cpu = 'i686'
 endian = 'little'
 
 [properties]
-ffmpeg_avcodec = 'avcodec-58'
-ffmpeg_avformat = 'avformat-58'
-ffmpeg_avutil = 'avutil-56'
-ffmpeg_swresample = 'swresample-3'
-prebuilt_ffmpeg = 'ffmpeg-win32-4.3.1'
+prebuilt_ffmpeg = 'ffmpeg-5.1.2-scrcpy/win32'
 prebuilt_sdl2 = 'SDL2-2.26.1/i686-w64-mingw32'
 prebuilt_libusb = 'libusb-1.0.26/libusb-MinGW-Win32'

cross_win64.txt

@@ -16,10 +16,6 @@ cpu = 'x86_64'
 endian = 'little'
 
 [properties]
-ffmpeg_avcodec = 'avcodec-59'
-ffmpeg_avformat = 'avformat-59'
-ffmpeg_avutil = 'avutil-57'
-ffmpeg_swresample = 'swresample-4'
-prebuilt_ffmpeg = 'ffmpeg-win64-5.1.2'
+prebuilt_ffmpeg = 'ffmpeg-5.1.2-scrcpy/win64'
 prebuilt_sdl2 = 'SDL2-2.26.1/x86_64-w64-mingw32'
 prebuilt_libusb = 'libusb-1.0.26/libusb-MinGW-x64'

release.mk

@@ -11,7 +11,7 @@
 .PHONY: default clean \
 	test \
 	build-server \
-	prepare-deps-win32 prepare-deps-win64 \
+	prepare-deps \
 	build-win32 build-win64 \
 	dist-win32 dist-win64 \
 	zip-win32 zip-win64 \
@@ -62,19 +62,13 @@ build-server:
 		meson setup "$(SERVER_BUILD_DIR)" --buildtype release -Dcompile_app=false )
 	ninja -C "$(SERVER_BUILD_DIR)"
 
-prepare-deps-win32:
+prepare-deps:
 	@app/prebuilt-deps/prepare-adb.sh
 	@app/prebuilt-deps/prepare-sdl.sh
-	@app/prebuilt-deps/prepare-ffmpeg-win32.sh
+	@app/prebuilt-deps/prepare-ffmpeg.sh
 	@app/prebuilt-deps/prepare-libusb.sh
 
-prepare-deps-win64:
-	@app/prebuilt-deps/prepare-adb.sh
-	@app/prebuilt-deps/prepare-sdl.sh
-	@app/prebuilt-deps/prepare-ffmpeg-win64.sh
-	@app/prebuilt-deps/prepare-libusb.sh
-
-build-win32: prepare-deps-win32
+build-win32: prepare-deps
 	[ -d "$(WIN32_BUILD_DIR)" ] || ( mkdir "$(WIN32_BUILD_DIR)" && \
 		meson setup "$(WIN32_BUILD_DIR)" \
 			--cross-file cross_win32.txt \
@@ -83,7 +77,7 @@ build-win32: prepare-deps-win32
 			-Dportable=true )
 	ninja -C "$(WIN32_BUILD_DIR)"
 
-build-win64: prepare-deps-win64
+build-win64: prepare-deps
 	[ -d "$(WIN64_BUILD_DIR)" ] || ( mkdir "$(WIN64_BUILD_DIR)" && \
 		meson setup "$(WIN64_BUILD_DIR)" \
 			--cross-file cross_win64.txt \
@@ -100,11 +94,11 @@ dist-win32: build-server build-win32
 	cp app/data/scrcpy-noconsole.vbs "$(DIST)/$(WIN32_TARGET_DIR)"
 	cp app/data/icon.png "$(DIST)/$(WIN32_TARGET_DIR)"
 	cp app/data/open_a_terminal_here.bat "$(DIST)/$(WIN32_TARGET_DIR)"
-	cp app/prebuilt-deps/data/ffmpeg-win32-4.3.1/bin/avutil-56.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win32-4.3.1/bin/avcodec-58.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win32-4.3.1/bin/avformat-58.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win32-4.3.1/bin/swresample-3.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win32-4.3.1/bin/swscale-5.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win32/bin/avutil-57.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win32/bin/avcodec-59.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win32/bin/avformat-59.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win32/bin/swresample-4.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win32/bin/zlib1.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-33.0.3/adb.exe "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-33.0.3/AdbWinApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-33.0.3/AdbWinUsbApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
@@ -119,11 +113,11 @@ dist-win64: build-server build-win64
 	cp app/data/scrcpy-noconsole.vbs "$(DIST)/$(WIN64_TARGET_DIR)"
 	cp app/data/icon.png "$(DIST)/$(WIN64_TARGET_DIR)"
 	cp app/data/open_a_terminal_here.bat "$(DIST)/$(WIN64_TARGET_DIR)"
-	cp app/prebuilt-deps/data/ffmpeg-win64-5.1.2/bin/avutil-57.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win64-5.1.2/bin/avcodec-59.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win64-5.1.2/bin/avformat-59.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win64-5.1.2/bin/swresample-4.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
-	cp app/prebuilt-deps/data/ffmpeg-win64-5.1.2/bin/swscale-6.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win64/bin/avutil-57.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win64/bin/avcodec-59.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win64/bin/avformat-59.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win64/bin/swresample-4.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/ffmpeg-5.1.2-scrcpy/win64/bin/zlib1.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-33.0.3/adb.exe "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-33.0.3/AdbWinApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-33.0.3/AdbWinUsbApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"