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Makefile
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# Compile FFmpeg and all its dependencies to JavaScript.
# You need emsdk environment installed and activated, see:
# <https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html>.
PRE_JS = build/pre.js
POST_JS_SYNC = build/post-sync.js
POST_JS_WORKER = build/post-worker.js
COMMON_FILTERS = aresample scale crop overlay hstack vstack
COMMON_DEMUXERS = matroska ogg mov mp3 wav image2 concat
COMMON_DECODERS = vp8 h264 vorbis opus mp3 aac pcm_s16le mjpeg png
WEBM_MUXERS = webm ogg null
WEBM_ENCODERS = libvpx_vp8 libopus
FFMPEG_WEBM_BC = build/ffmpeg-webm/ffmpeg.bc
FFMPEG_WEBM_PC_PATH = ../opus/dist/lib/pkgconfig
WEBM_SHARED_DEPS = \
build/opus/dist/lib/libopus.so \
build/libvpx/dist/lib/libvpx.so
MP4_MUXERS = mp4 mp3 null
MP4_ENCODERS = libx264 libmp3lame aac
FFMPEG_MP4_BC = build/ffmpeg-mp4/ffmpeg.bc
FFMPEG_MP4_PC_PATH = ../x264/dist/lib/pkgconfig
MP4_SHARED_DEPS = \
build/lame/dist/lib/libmp3lame.so \
build/x264/dist/lib/libx264.so
all: webm mp4
webm: ffmpeg-webm.js ffmpeg-worker-webm.js
mp4: ffmpeg-mp4.js ffmpeg-worker-mp4.js
clean: clean-js \
clean-opus clean-libvpx clean-ffmpeg-webm \
clean-lame clean-x264 clean-ffmpeg-mp4
clean-js:
rm -f ffmpeg*.js
clean-opus:
cd build/opus && git clean -xdf
clean-libvpx:
cd build/libvpx && git clean -xdf
clean-ffmpeg-webm:
cd build/ffmpeg-webm && git clean -xdf
clean-lame:
cd build/lame && git clean -xdf
clean-x264:
cd build/x264 && git clean -xdf
clean-ffmpeg-mp4:
cd build/ffmpeg-mp4 && git clean -xdf
build/opus/configure:
cd build/opus && ./autogen.sh
build/opus/dist/lib/libopus.so: build/opus/configure
cd build/opus && \
emconfigure ./configure \
CFLAGS=-O3 \
--prefix="$$(pwd)/dist" \
--disable-static \
--disable-doc \
--disable-extra-programs \
--disable-asm \
--disable-rtcd \
--disable-intrinsics \
--disable-hardening \
--disable-stack-protector \
&& \
emmake make -j && \
emmake make install
build/libvpx/dist/lib/libvpx.so:
cd build/libvpx && \
git reset --hard && \
patch -p1 < ../libvpx-fix-ld.patch && \
emconfigure ./configure \
--prefix="$$(pwd)/dist" \
--target=generic-gnu \
--disable-dependency-tracking \
--disable-multithread \
--disable-runtime-cpu-detect \
--enable-shared \
--disable-static \
\
--disable-examples \
--disable-docs \
--disable-unit-tests \
--disable-webm-io \
--disable-libyuv \
--disable-vp8-decoder \
--disable-vp9 \
&& \
emmake make -j && \
emmake make install
build/lame/dist/lib/libmp3lame.so:
cd build/lame/lame && \
git reset --hard && \
patch -p2 < ../../lame-fix-ld.patch && \
emconfigure ./configure \
CFLAGS="-DNDEBUG -O3" \
--prefix="$$(pwd)/../dist" \
--host=x86-none-linux \
--disable-static \
\
--disable-gtktest \
--disable-analyzer-hooks \
--disable-decoder \
--disable-frontend \
&& \
emmake make -j && \
emmake make install
build/x264/dist/lib/libx264.so:
cd build/x264 && \
emconfigure ./configure \
--prefix="$$(pwd)/dist" \
--extra-cflags="-Wno-unknown-warning-option" \
--host=x86-none-linux \
--disable-cli \
--enable-shared \
--disable-opencl \
--disable-thread \
--disable-interlaced \
--bit-depth=8 \
--chroma-format=420 \
--disable-asm \
\
--disable-avs \
--disable-swscale \
--disable-lavf \
--disable-ffms \
--disable-gpac \
--disable-lsmash \
&& \
emmake make -j && \
emmake make install
# TODO(Kagami): Emscripten documentation recommends to always use shared
# libraries but it's not possible in case of ffmpeg because it has
# multiple declarations of `ff_log2_tab` symbol. GCC builds FFmpeg fine
# though because it uses version scripts and so `ff_log2_tag` symbols
# are not exported to the shared libraries. Seems like `emcc` ignores
# them. We need to file bugreport to upstream. See also:
# - <https://kripken.github.io/emscripten-site/docs/compiling/Building-Projects.html>
# - <https://github.com/kripken/emscripten/issues/831>
# - <https://ffmpeg.org/pipermail/libav-user/2013-February/003698.html>
FFMPEG_COMMON_ARGS = \
--cc=emcc \
--ranlib=emranlib \
--enable-cross-compile \
--target-os=none \
--arch=x86 \
--disable-runtime-cpudetect \
--disable-asm \
--disable-fast-unaligned \
--disable-pthreads \
--disable-w32threads \
--disable-os2threads \
--disable-debug \
--disable-stripping \
--disable-safe-bitstream-reader \
\
--disable-all \
--enable-ffmpeg \
--enable-avcodec \
--enable-avformat \
--enable-avfilter \
--enable-swresample \
--enable-swscale \
--disable-network \
--disable-d3d11va \
--disable-dxva2 \
--disable-vaapi \
--disable-vdpau \
$(addprefix --enable-decoder=,$(COMMON_DECODERS)) \
$(addprefix --enable-demuxer=,$(COMMON_DEMUXERS)) \
--enable-protocol=file \
$(addprefix --enable-filter=,$(COMMON_FILTERS)) \
--disable-bzlib \
--disable-iconv \
--disable-libxcb \
--disable-lzma \
--disable-sdl2 \
--disable-securetransport \
--disable-xlib \
--enable-zlib
build/ffmpeg-webm/ffmpeg.bc: $(WEBM_SHARED_DEPS)
cd build/ffmpeg-webm && \
EM_PKG_CONFIG_PATH=$(FFMPEG_WEBM_PC_PATH) emconfigure ./configure \
$(FFMPEG_COMMON_ARGS) \
$(addprefix --enable-encoder=,$(WEBM_ENCODERS)) \
$(addprefix --enable-muxer=,$(WEBM_MUXERS)) \
--enable-libopus \
--enable-libvpx \
--extra-cflags="-s USE_ZLIB=1 -I../libvpx/dist/include" \
--extra-ldflags="-L../libvpx/dist/lib" \
&& \
emmake make -j && \
cp ffmpeg ffmpeg.bc
build/ffmpeg-mp4/ffmpeg.bc: $(MP4_SHARED_DEPS)
cd build/ffmpeg-mp4 && \
EM_PKG_CONFIG_PATH=$(FFMPEG_MP4_PC_PATH) emconfigure ./configure \
$(FFMPEG_COMMON_ARGS) \
$(addprefix --enable-encoder=,$(MP4_ENCODERS)) \
$(addprefix --enable-muxer=,$(MP4_MUXERS)) \
--enable-gpl \
--enable-libmp3lame \
--enable-libx264 \
--extra-cflags="-s USE_ZLIB=1 -I../lame/dist/include" \
--extra-ldflags="-L../lame/dist/lib" \
&& \
emmake make -j && \
cp ffmpeg ffmpeg.bc
EMCC_COMMON_ARGS = \
-O3 \
--closure 1 \
--memory-init-file 0 \
-s WASM=0 \
-s WASM_ASYNC_COMPILATION=0 \
-s ASSERTIONS=0 \
-s EXIT_RUNTIME=1 \
-s NODEJS_CATCH_EXIT=0 \
-s NODEJS_CATCH_REJECTION=0 \
-s TOTAL_MEMORY=67108864 \
-lnodefs.js -lworkerfs.js \
--pre-js $(PRE_JS) \
-o $@
ffmpeg-webm.js: $(FFMPEG_WEBM_BC) $(PRE_JS) $(POST_JS_SYNC)
emcc $(FFMPEG_WEBM_BC) $(WEBM_SHARED_DEPS) \
--post-js $(POST_JS_SYNC) \
$(EMCC_COMMON_ARGS)
ffmpeg-worker-webm.js: $(FFMPEG_WEBM_BC) $(PRE_JS) $(POST_JS_WORKER)
emcc $(FFMPEG_WEBM_BC) $(WEBM_SHARED_DEPS) \
--post-js $(POST_JS_WORKER) \
$(EMCC_COMMON_ARGS)
ffmpeg-mp4.js: $(FFMPEG_MP4_BC) $(PRE_JS) $(POST_JS_SYNC)
emcc $(FFMPEG_MP4_BC) $(MP4_SHARED_DEPS) \
--post-js $(POST_JS_SYNC) \
$(EMCC_COMMON_ARGS) -O2
ffmpeg-worker-mp4.js: $(FFMPEG_MP4_BC) $(PRE_JS) $(POST_JS_WORKER)
emcc $(FFMPEG_MP4_BC) $(MP4_SHARED_DEPS) \
--post-js $(POST_JS_WORKER) \
$(EMCC_COMMON_ARGS) -O2