Add build script

Author: jeromewu

build.sh

@@ -32,6 +32,8 @@ $SCRIPT_ROOT/build-theora.sh
 $SCRIPT_ROOT/build-opus.sh
 # build freetype2
 $SCRIPT_ROOT/build-freetype2.sh
+# build libwebp
+$SCRIPT_ROOT/build-libwebp.sh
 # build aom (disabled as it is extremely slow)
 # $SCRIPT_ROOT/build-aom.sh
 # configure FFmpeg with Emscripten

wasm/build-scripts/build-ffmpeg.sh

@@ -9,7 +9,7 @@ FLAGS=(
   -I. -I./fftools -I$BUILD_DIR/include
   -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -L$BUILD_DIR/lib
   -Wno-deprecated-declarations -Wno-pointer-sign -Wno-implicit-int-float-conversion -Wno-switch -Wno-parentheses -Qunused-arguments
-  -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lpostproc -lm -lx264 -lx265 -lvpx -lwavpack -lmp3lame -lfdk-aac -lvorbis -lvorbisenc -lvorbisfile -logg -ltheora -ltheoraenc -ltheoradec -lz -lfreetype -lopus -pthread
+  -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lpostproc -lm -lx264 -lx265 -lvpx -lwavpack -lmp3lame -lfdk-aac -lvorbis -lvorbisenc -lvorbisfile -logg -ltheora -ltheoraenc -ltheoradec -lz -lfreetype -lopus -lwebp -pthread
   fftools/ffmpeg_opt.c fftools/ffmpeg_filter.c fftools/ffmpeg_hw.c fftools/cmdutils.c fftools/ffmpeg.c
   -o wasm/dist/ffmpeg-core.js
   -s USE_SDL=2                                  # use SDL2

wasm/build-scripts/build-libwebp.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -euo pipefail
+source $(dirname $0)/var.sh
+
+LIB_PATH=third_party/libwebp
+CXXFLAGS="-s USE_PTHREADS=1 $OPTIM_FLAGS"
+CM_FLAGS=(
+  -DCMAKE_INSTALL_PREFIX=$BUILD_DIR
+  -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_FILE
+  -DBUILD_SHARED_LIBS=OFF
+  -DZLIB_LIBRARY=$BUILD_DIR/lib
+  -DZLIB_INCLUDE_DIR=$BUILD_DIR/include
+  -DWEBP_ENABLE_SIMD=ON
+  -DWEBP_BUILD_ANIM_UTILS=OFF
+  -DWEBP_BUILD_CWEBP=OFF
+  -DWEBP_BUILD_DWEBP=OFF
+  -DWEBP_BUILD_GIF2WEBP=OFF
+  -DWEBP_BUILD_IMG2WEBP=OFF
+  -DWEBP_BUILD_VWEBP=OFF
+  -DWEBP_BUILD_WEBPINFO=OFF
+  -DWEBP_BUILD_WEBPMUX=OFF
+  -DWEBP_BUILD_EXTRAS=OFF
+)
+echo "CM_FLAGS=${CM_FLAGS[@]}"
+
+cd $LIB_PATH
+mkdir -p build
+cd build
+emmake cmake .. -DCMAKE_C_FLAGS="$CXXFLAGS" ${CM_FLAGS[@]}
+emmake make clean
+emmake make install
+cd $ROOT_DIR

wasm/build-scripts/configure-ffmpeg.sh

@@ -18,6 +18,7 @@ FLAGS=(
   --enable-libvorbis      # enable libvorbis
   --enable-libfreetype    # enable freetype
   --enable-libopus        # enable opus
+  --enable-libwebp        # enable libwebp
   # --enable-libaom         # enable libaom
 )
 echo "FFMPEG_CONFIG_FLAGS=${FLAGS[@]}"