Enable libass support (#5)

* Enable libass

* Fixed PKG config path

* fixed libass static reference

* fixed libass static reference

* newline at end of file

.gitmodules

@@ -43,3 +43,12 @@
 [submodule "third_party/libwebp"]
 	path = third_party/libwebp
 	url = https://github.com/ffmpegwasm/libwebp
+[submodule "third_party/fribidi"]
+	path = third_party/fribidi
+	url = https://github.com/fribidi/fribidi.git
+[submodule "third_party/harfbuzz"]
+	path = third_party/harfbuzz
+	url = https://github.com/harfbuzz/harfbuzz.git
+[submodule "third_party/libass"]
+	path = third_party/libass
+	url = https://github.com/libass/libass.git

build.sh

@@ -34,6 +34,12 @@ $SCRIPT_ROOT/build-opus.sh
 $SCRIPT_ROOT/build-freetype2.sh
 # build libwebp
 $SCRIPT_ROOT/build-libwebp.sh
+# build fribidi
+$SCRIPT_ROOT/build-fribidi.sh
+# build harfbuzz
+$SCRIPT_ROOT/build-harfbuzz.sh
+# build libass
+$SCRIPT_ROOT/build-libass.sh
 # build aom (disabled as it is extremely slow)
 # $SCRIPT_ROOT/build-aom.sh
 # configure FFmpeg with Emscripten

fribidi @ 3585a81e

+Subproject commit 3585a81e625e5b35962bed11fdc99d54485048e0

harfbuzz @ 2fbd34f8

+Subproject commit 2fbd34f89a80fb25aa0f8edd1dbb692c66211842

libass @ d0634f4a

+Subproject commit d0634f4a669c86063e2765891bfdec17719f40c2

wasm/build-scripts/build-ffmpeg.sh

@@ -7,9 +7,9 @@ mkdir -p wasm/dist
 emmake make -j
 FLAGS=(
   -I. -I./fftools -I$BUILD_DIR/include
-  -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -L$BUILD_DIR/lib
+  -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Lharfbuzz -Llibass -Lfribidi -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 -lwebp -pthread
+  -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lpostproc -lm -lharfbuzz -lfribidi -llibass -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-fribidi.sh

+#!/bin/bash
+
+set -euo pipefail
+source $(dirname $0)/var.sh
+
+LIB_PATH=third_party/fribidi
+CFLAGS="-s USE_PTHREADS=1 $OPTIM_FLAGS"
+CONF_FLAGS=(
+  --prefix=$BUILD_DIR                                 # install library in a build directory for FFmpeg to include
+  --host=i686-gnu                                     # use i686 linux
+  --enable-shared=no                                  # not to build shared library
+  --enable-static 
+  --disable-dependency-tracking
+	--disable-debug
+	--without-glib
+  --disable-docs
+)
+echo "CONF_FLAGS=${CONF_FLAGS[@]}"
+(cd $LIB_PATH && \
+  emconfigure ./autogen.sh && \
+  CFLAGS=$CFLAGS emconfigure ./configure "${CONF_FLAGS[@]}")
+emmake make -C $LIB_PATH clean
+emmake make -C $LIB_PATH install -j1

wasm/build-scripts/build-harfbuzz.sh

+#!/bin/bash
+
+set -euo pipefail
+source $(dirname $0)/var.sh
+
+LIB_PATH=third_party/harfbuzz
+CFLAGS="-s USE_PTHREADS=1 $OPTIM_FLAGS"
+CONF_FLAGS=(
+  --prefix=$BUILD_DIR                                 # install library in a build directory for FFmpeg to include
+  --host=i686-gnu                                     # use i686 linux
+  --enable-shared=no                                  # not to build shared library
+  --enable-static 
+)
+echo "CONF_FLAGS=${CONF_FLAGS[@]}"
+(cd $LIB_PATH && \
+  emconfigure ./autogen.sh && \
+  CFLAGS=$CFLAGS emconfigure ./configure "${CONF_FLAGS[@]}")
+emmake make -C $LIB_PATH clean
+emmake make -C $LIB_PATH install -j

wasm/build-scripts/build-libass.sh

+#!/bin/bash
+
+set -euo pipefail
+source $(dirname $0)/var.sh
+
+LIB_PATH=third_party/libass
+LIBASS_PC_PATH="$BUILD_DIR/lib/pkgconfig"
+CONF_FLAGS=(
+  --prefix=$BUILD_DIR                                 # install library in a build directory for FFmpeg to include
+  --host=i686-gnu                                     # use i686 linux
+  --disable-shared
+  --enable-static
+  --disable-asm                                       # disable asm optimization
+  --disable-fontconfig
+  --disable-require-system-font-provider
+)
+echo "CONF_FLAGS=${CONF_FLAGS[@]}"
+(cd $LIB_PATH && ./autogen.sh && EM_PKG_CONFIG_PATH=$LIBASS_PC_PATH emconfigure ./configure "${CONF_FLAGS[@]}")
+emmake make -C $LIB_PATH clean
+emmake make -C $LIB_PATH install -j

wasm/build-scripts/configure-ffmpeg.sh

@@ -3,6 +3,7 @@
 set -euo pipefail
 source $(dirname $0)/var.sh
 
+FFMPEG_WEBM_PC_PATH="$BUILD_DIR/lib/pkgconfig"
 FLAGS=(
   "${FFMPEG_CONFIG_FLAGS_BASE[@]}"
   --enable-gpl            # required by x264
@@ -22,4 +23,4 @@ FLAGS=(
   # --enable-libaom         # enable libaom
 )
 echo "FFMPEG_CONFIG_FLAGS=${FLAGS[@]}"
-emconfigure ./configure "${FLAGS[@]}"
+EM_PKG_CONFIG_PATH=${FFMPEG_WEBM_PC_PATH} emconfigure ./configure "${FLAGS[@]}"

wasm/build-scripts/var.sh

@@ -58,6 +58,8 @@ FFMPEG_CONFIG_FLAGS_BASE=(
   --cxx=em++
   --objcc=emcc
   --dep-cc=emcc
+  --enable-libass
+  --enable-filter=subtitles,overlay
 )
 
 echo "EMSDK=$EMSDK"