Add opus build scripts and tests

build.sh

@@ -28,6 +28,8 @@ $SCRIPT_ROOT/build-ogg.sh
 $SCRIPT_ROOT/build-vorbis.sh
 # build theora
 $SCRIPT_ROOT/build-theora.sh
+# build opus
+$SCRIPT_ROOT/build-opus.sh
 # build freetype2
 $SCRIPT_ROOT/build-freetype2.sh
 # build aom (disabled as it is extremely slow)

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 -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 -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-opus.sh

+#!/bin/bash
+
+set -euo pipefail
+source $(dirname $0)/var.sh
+
+LIB_PATH=third_party/opus
+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
+  --disable-asm                                       # not to use asm
+  --disable-rtcd                                      # not to detect cpu capabilities
+  --disable-doc                                       # not to build docs
+  --disable-extra-programs                            # not to build demo and tests
+  --disable-stack-protector
+)
+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/configure-ffmpeg.sh

@@ -17,6 +17,7 @@ FLAGS=(
   --enable-libtheora      # enable libtheora
   --enable-libvorbis      # enable libvorbis
   --enable-libfreetype    # enable freetype
+  --enable-libopus        # enable opus
   # --enable-libaom         # enable libaom
 )
 echo "FFMPEG_CONFIG_FLAGS=${FLAGS[@]}"

wasm/tests/opus.test.js

+const fs = require('fs');
+const path = require('path');
+const { TIMEOUT } = require('./config');
+const { runFFmpeg } = require('./utils');
+const IN_FILE_NAME = 'audio-1s.wav';
+const OUT_FILE_NAME = 'audio.opus';
+const FILE_SIZE = 12793;
+let wavData = null;
+
+beforeAll(() => {
+  wavData = Uint8Array.from(fs.readFileSync(path.join(__dirname, 'data', IN_FILE_NAME)));
+});
+
+test('convert wav to mp3', async () => {
+  const args = ['-i', IN_FILE_NAME, '-c:a', 'libopus', OUT_FILE_NAME];
+  const { fileSize } = await runFFmpeg(IN_FILE_NAME, wavData, args, OUT_FILE_NAME);
+  expect(fileSize).toBe(FILE_SIZE);
+}, TIMEOUT);