#!/bin/bash -eux
# Copyright 2016 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
################################################################################

# Disable UBSan vptr since several targets built with -fno-rtti.
export CFLAGS="$CFLAGS -fno-sanitize=vptr"
export CXXFLAGS="$CXXFLAGS -fno-sanitize=vptr"

# Build dependencies.
export FFMPEG_DEPS_PATH=$SRC/ffmpeg_deps
mkdir -p $FFMPEG_DEPS_PATH

cd $SRC
bzip2 -f -d alsa-lib-*
tar xf alsa-lib-*
cd alsa-lib-*
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static --disable-shared
make clean
make -j$(nproc) all
make install

cd $SRC/drm
# Requires xutils-dev libpciaccess-dev
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/fdk-aac
autoreconf -fiv
./configure --prefix="$FFMPEG_DEPS_PATH" --disable-shared
make clean
make -j$(nproc) all
make install

cd $SRC
tar xzf lame.tar.gz
cd lame-*
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/libXext
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/libXfixes
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/libva
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static --disable-shared
make clean
make -j$(nproc) all
make install

cd $SRC/libvdpau
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static --disable-shared
make clean
make -j$(nproc) all
make install

cd $SRC/libvpx
LDFLAGS="$CXXFLAGS" ./configure --prefix="$FFMPEG_DEPS_PATH" \
    --disable-examples --disable-unit-tests
make clean
make -j$(nproc) all
make install

cd $SRC/ogg
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/opus
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc) all
make install

cd $SRC/theora
# theora requires ogg, need to pass its location to the "configure" script.
CFLAGS="$CFLAGS -fPIC" LDFLAGS="-L$FFMPEG_DEPS_PATH/lib/" \
    CPPFLAGS="$CXXFLAGS -I$FFMPEG_DEPS_PATH/include/" \
    LD_LIBRARY_PATH="$FFMPEG_DEPS_PATH/lib/" \
    ./autogen.sh --prefix="$FFMPEG_DEPS_PATH" --enable-static --disable-examples
make clean
make -j$(nproc)
make install

cd $SRC/vorbis
./autogen.sh
./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/x264
LDFLAGS="$CXXFLAGS" ./configure --prefix="$FFMPEG_DEPS_PATH" \
    --enable-static
make clean
make -j$(nproc)
make install

cd $SRC/x265/build/linux
cmake -G "Unix Makefiles" \
    -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX \
    -DCMAKE_C_FLAGS="$CFLAGS" -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
    -DCMAKE_INSTALL_PREFIX="$FFMPEG_DEPS_PATH" -DENABLE_SHARED:bool=off \
    ../../source
make clean
make -j$(nproc) x265-static
make install

# Remove shared libraries to avoid accidental linking against them.
rm $FFMPEG_DEPS_PATH/lib/*.so
rm $FFMPEG_DEPS_PATH/lib/*.so.*

# Build ffmpeg.
cd $SRC/ffmpeg
PKG_CONFIG_PATH="$FFMPEG_DEPS_PATH/lib/pkgconfig" ./configure \
    --cc=$CC --cxx=$CXX --ld="$CXX $CXXFLAGS -std=c++11" \
    --extra-cflags="-I$FFMPEG_DEPS_PATH/include" \
    --extra-ldflags="-L$FFMPEG_DEPS_PATH/lib" \
    --prefix="$FFMPEG_DEPS_PATH" \
    --pkg-config-flags="--static" \
    --enable-ossfuzz \
    --libfuzzer=-lFuzzingEngine \
    --optflags=-O1 \
    --enable-gpl \
    --enable-libass \
    --enable-libfdk-aac \
    --enable-libfreetype \
    --enable-libmp3lame \
    --enable-libopus \
    --enable-libtheora \
    --enable-libvorbis \
    --enable-libvpx \
    --enable-libx264 \
    --enable-libx265 \
    --enable-nonfree \
    --disable-shared
make clean
make -j$(nproc) install

# Download test sampes, will be used as seed corpus.
# DISABLED.
# TODO: implement a better way to maintain a minimized seed corpora
# for all targets. As of 2017-05-04 now the combined size of corpora
# is too big for ClusterFuzz (over 10Gb compressed data).
# export TEST_SAMPLES_PATH=$SRC/ffmpeg/fate-suite/
# make fate-rsync SAMPLES=$TEST_SAMPLES_PATH

# Build the fuzzers.
cd $SRC/ffmpeg

FUZZ_TARGET_SOURCE=$SRC/ffmpeg/tools/target_dec_fuzzer.c

export TEMP_VAR_CODEC="AV_CODEC_ID_H264"
export TEMP_VAR_CODEC_TYPE="VIDEO"

# Build fuzzers for decoders.
CONDITIONALS=`grep 'DECODER 1$' config.h | sed 's/#define CONFIG_\(.*\)_DECODER 1/\1/'`
for c in $CONDITIONALS ; do
  fuzzer_name=ffmpeg_AV_CODEC_ID_${c}_fuzzer
  symbol=`git grep 'REGISTER_[A-Z]*DEC[A-Z ]*('"$c"' *,' libavcodec/allcodecs.c | sed 's/.*, *\([^) ]*\)).*/\1/'`
  echo -en "[libfuzzer]\nmax_len = 1000000\n" > $OUT/${fuzzer_name}.options
  make tools/target_dec_${symbol}_fuzzer
  mv tools/target_dec_${symbol}_fuzzer $OUT/${fuzzer_name}
done

# Find relevant corpus in test samples and archive them for every fuzzer.
#cd $SRC
#python group_seed_corpus.py $TEST_SAMPLES_PATH $OUT/