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diff --git a/media/libvpx/generate_sources_mozbuild.sh b/media/libvpx/generate_sources_mozbuild.sh
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+++ b/media/libvpx/generate_sources_mozbuild.sh
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+#!/bin/bash -e
+#
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Modified from chromium/src/third_party/libvpx/generate_gni.sh
+
+# This script is used to generate sources.mozbuild and files in the
+# config/platform directories needed to build libvpx.
+# Every time libvpx source code is updated just run this script.
+#
+# Usage:
+# $ ./generate_sources_mozbuild.sh
+
+export LC_ALL=C
+BASE_DIR=$(pwd)
+LIBVPX_SRC_DIR="libvpx"
+LIBVPX_CONFIG_DIR="config"
+DISABLE_AVX="--disable-avx512"
+
+# Print license header.
+# $1 - Output base name
+function write_license {
+  echo "# This file is generated. Do not edit." >> $1
+  echo "" >> $1
+}
+
+# Search for source files with the same basename in vp8, vp9, and vpx_dsp. The
+# build does not support duplicate file names.
+function find_duplicates {
+  local readonly duplicate_file_names=$(find \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vp8 \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vp9 \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vpx_dsp \
+    -type f -name \*.c  | xargs -I {} basename {} | sort | uniq -d \
+  )
+
+  if [ -n "${duplicate_file_names}" ]; then
+    echo "ERROR: DUPLICATE FILES FOUND"
+    for file in  ${duplicate_file_names}; do
+      find \
+        $BASE_DIR/$LIBVPX_SRC_DIR/vp8 \
+        $BASE_DIR/$LIBVPX_SRC_DIR/vp9 \
+        $BASE_DIR/$LIBVPX_SRC_DIR/vpx_dsp \
+        -name $file
+    done
+    exit 1
+  fi
+}
+
+# Generate sources.mozbuild with a list of source files.
+# $1 - Array name for file list. This is processed with 'declare' below to
+#      regenerate the array locally.
+# $2 - Variable name.
+# $3 - Output file.
+function write_sources {
+  # Convert the first argument back in to an array.
+  declare -a file_list=("${!1}")
+
+  echo "  '$2': [" >> "$3"
+  for f in $file_list
+  do
+    echo "    'libvpx/$f'," >> "$3"
+  done
+  echo "]," >> "$3"
+}
+
+# Convert a list of source files into sources.mozbuild.
+# $1 - Input file.
+# $2 - Output prefix.
+function convert_srcs_to_project_files {
+  # Do the following here:
+  # 1. Filter .c, .h, .s, .S and .asm files.
+  # 3. Convert .asm.s to .asm because moz.build will do the conversion.
+
+  local source_list=$(grep -E '(\.c|\.h|\.S|\.s|\.asm)$' $1)
+
+  # Remove vpx_config.c.
+  source_list=$(echo "$source_list" | grep -v 'vpx_config\.c')
+
+  # Remove include-only asm files (no object code emitted)
+  source_list=$(echo "$source_list" | grep -v 'x86_abi_support\.asm')
+  source_list=$(echo "$source_list" | grep -v 'config\.asm')
+
+  # The actual ARM files end in .asm. We have rules to translate them to .S
+  source_list=$(echo "$source_list" | sed s/\.asm\.s$/.asm/)
+
+  # Exports - everything in vpx, vpx_mem, vpx_ports, vpx_scale
+  local exports_list=$(echo "$source_list" | \
+    egrep '^(vpx|vpx_mem|vpx_ports|vpx_scale)/.*h$')
+  # but not anything in one level down, like 'internal'
+  exports_list=$(echo "$exports_list" | egrep -v '/(internal|src)/')
+  # or any of the other internal-ish header files.
+  exports_list=$(echo "$exports_list" | egrep -v '/(emmintrin_compat.h|mem_.*|msvc.h|vpx_once.h)$')
+
+  # Remove these files from the main list.
+  source_list=$(comm -23 <(echo "$source_list") <(echo "$exports_list"))
+
+  # Write a single file that includes all source files for all archs.
+  local c_sources=$(echo "$source_list" | egrep '.(asm|c)$')
+  local exports_sources=$(echo "$exports_list" | egrep '.h$')
+
+  write_sources exports_sources ${2}_EXPORTS "$BASE_DIR/sources.mozbuild"
+  write_sources c_sources ${2}_SOURCES "$BASE_DIR/sources.mozbuild"
+}
+
+# Clean files from previous make.
+function make_clean {
+  make clean > /dev/null
+  rm -f libvpx_srcs.txt
+}
+
+# Print the configuration.
+# $1 - Header file directory.
+function print_config {
+  $BASE_DIR/lint_config.sh -p \
+    -h $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vpx_config.h \
+    -a $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vpx_config.asm
+}
+
+# Generate *_rtcd.h files.
+# $1 - Header file directory.
+# $2 - Architecture.
+# $3 - Optional - any additional arguments to pass through.
+function gen_rtcd_header {
+  echo "Generate $LIBVPX_CONFIG_DIR/$1/*_rtcd.h files."
+
+  rm -rf $BASE_DIR/$TEMP_DIR/libvpx.config
+  $BASE_DIR/lint_config.sh -p \
+    -h $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vpx_config.h \
+    -a $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vpx_config.asm \
+    -o $BASE_DIR/$TEMP_DIR/libvpx.config
+
+  $BASE_DIR/$LIBVPX_SRC_DIR/build/make/rtcd.pl \
+    --arch=$2 \
+    --sym=vp8_rtcd $DISABLE_AVX $3 \
+    --config=$BASE_DIR/$TEMP_DIR/libvpx.config \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vp8/common/rtcd_defs.pl \
+    > $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vp8_rtcd.h
+
+  $BASE_DIR/$LIBVPX_SRC_DIR/build/make/rtcd.pl \
+    --arch=$2 \
+    --sym=vp9_rtcd $DISABLE_AVX $3 \
+    --config=$BASE_DIR/$TEMP_DIR/libvpx.config \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vp9/common/vp9_rtcd_defs.pl \
+    > $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vp9_rtcd.h
+
+  $BASE_DIR/$LIBVPX_SRC_DIR/build/make/rtcd.pl \
+    --arch=$2 \
+    --sym=vpx_scale_rtcd $DISABLE_AVX $3 \
+    --config=$BASE_DIR/$TEMP_DIR/libvpx.config \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vpx_scale/vpx_scale_rtcd.pl \
+    > $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vpx_scale_rtcd.h
+
+  $BASE_DIR/$LIBVPX_SRC_DIR/build/make/rtcd.pl \
+    --arch=$2 \
+    --sym=vpx_dsp_rtcd $DISABLE_AVX $3 \
+    --config=$BASE_DIR/$TEMP_DIR/libvpx.config \
+    $BASE_DIR/$LIBVPX_SRC_DIR/vpx_dsp/vpx_dsp_rtcd_defs.pl \
+    > $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/vpx_dsp_rtcd.h
+
+  rm -rf $BASE_DIR/$TEMP_DIR/libvpx.config
+}
+
+# Generate Config files. "--enable-external-build" must be set to skip
+# detection of capabilities on specific targets.
+# $1 - Header file directory.
+# $2 - Config command line.
+function gen_config_files {
+  ./configure $2 > /dev/null
+
+  # Disable HAVE_UNISTD_H.
+  ( echo '/HAVE_UNISTD_H'; echo 'd' ; echo 'w' ; echo 'q' ) | ed -s vpx_config.h
+
+  local ASM_CONV=ads2gas.pl
+
+  # Generate vpx_config.asm.
+  if [[ "$1" == *x64* ]] || [[ "$1" == *ia32* ]]; then
+    egrep "#define [A-Z0-9_]+ [01]" vpx_config.h | awk '{print "%define " $2 " " $3}' > vpx_config.asm
+  else
+    egrep "#define [A-Z0-9_]+ [01]" vpx_config.h | awk '{print $2 " EQU " $3}' | perl $BASE_DIR/$LIBVPX_SRC_DIR/build/make/$ASM_CONV > vpx_config.asm
+  fi
+
+  cp vpx_config.* $BASE_DIR/$LIBVPX_CONFIG_DIR/$1
+  make_clean
+  rm -rf vpx_config.*
+}
+
+find_duplicates
+
+echo "Create temporary directory."
+TEMP_DIR="$LIBVPX_SRC_DIR.temp"
+rm -rf $TEMP_DIR
+cp -R $LIBVPX_SRC_DIR $TEMP_DIR
+cd $TEMP_DIR
+
+echo "Generate config files."
+all_platforms="--enable-external-build --disable-examples --disable-install-docs --disable-unit-tests"
+all_platforms="${all_platforms} --enable-multi-res-encoding --size-limit=8192x4608 --enable-pic"
+all_platforms="${all_platforms} --disable-avx512"
+x86_platforms="--enable-postproc --enable-vp9-postproc --as=yasm"
+arm_platforms="--enable-runtime-cpu-detect --enable-realtime-only"
+arm64_platforms="--enable-realtime-only"
+
+gen_config_files linux/x64 "--target=x86_64-linux-gcc ${all_platforms} ${x86_platforms}"
+gen_config_files linux/ia32 "--target=x86-linux-gcc ${all_platforms} ${x86_platforms}"
+gen_config_files mac/x64 "--target=x86_64-darwin9-gcc ${all_platforms} ${x86_platforms}"
+gen_config_files mac/ia32 "--target=x86-darwin9-gcc ${all_platforms} ${x86_platforms}"
+gen_config_files win/x64 "--target=x86_64-win64-vs15 ${all_platforms} ${x86_platforms}"
+gen_config_files win/ia32 "--target=x86-win32-gcc ${all_platforms} ${x86_platforms}"
+
+gen_config_files linux/arm "--target=armv7-linux-gcc ${all_platforms} ${arm_platforms}"
+gen_config_files linux/arm64 "--target=arm64-linux-gcc ${all_platforms} ${arm64_platforms}"
+gen_config_files win/aarch64 "--target=arm64-win64-vs15 ${all_platforms} ${arm64_platforms}"
+
+gen_config_files generic "--target=generic-gnu ${all_platforms}"
+
+echo "Remove temporary directory."
+cd $BASE_DIR
+rm -rf $TEMP_DIR
+
+echo "Create temporary directory."
+TEMP_DIR="$LIBVPX_SRC_DIR.temp"
+rm -rf $TEMP_DIR
+cp -R $LIBVPX_SRC_DIR $TEMP_DIR
+cd $TEMP_DIR
+
+gen_rtcd_header linux/x64 x86_64
+gen_rtcd_header linux/ia32 x86
+gen_rtcd_header mac/x64 x86_64
+gen_rtcd_header mac/ia32 x86
+gen_rtcd_header win/x64 x86_64
+gen_rtcd_header win/ia32 x86
+
+gen_rtcd_header linux/arm armv7
+gen_rtcd_header linux/arm64 arm64
+gen_rtcd_header win/aarch64 arm64
+
+gen_rtcd_header generic generic
+
+echo "Prepare Makefile."
+./configure --target=generic-gnu > /dev/null
+make_clean
+
+# Remove existing source files.
+rm -rf $BASE_DIR/sources.mozbuild
+write_license $BASE_DIR/sources.mozbuild
+echo "files = {" >> $BASE_DIR/sources.mozbuild
+
+echo "Generate X86_64 source list."
+config=$(print_config linux/x64)
+make_clean
+make libvpx_srcs.txt target=libs $config > /dev/null
+convert_srcs_to_project_files libvpx_srcs.txt X64
+
+# Copy vpx_version.h once. The file is the same for all platforms.
+cp vpx_version.h $BASE_DIR/$LIBVPX_CONFIG_DIR
+
+echo "Generate IA32 source list."
+config=$(print_config linux/ia32)
+make_clean
+make libvpx_srcs.txt target=libs $config > /dev/null
+convert_srcs_to_project_files libvpx_srcs.txt IA32
+
+echo "Generate ARM source list."
+config=$(print_config linux/arm)
+make_clean
+make libvpx_srcs.txt target=libs $config > /dev/null
+convert_srcs_to_project_files libvpx_srcs.txt ARM
+
+echo "Generate ARM64 source list."
+config=$(print_config linux/arm64)
+make_clean
+make libvpx_srcs.txt target=libs $config > /dev/null
+convert_srcs_to_project_files libvpx_srcs.txt ARM64
+
+echo "Generate generic source list."
+config=$(print_config generic)
+make_clean
+make libvpx_srcs.txt target=libs $config > /dev/null
+convert_srcs_to_project_files libvpx_srcs.txt GENERIC
+
+echo "}" >> $BASE_DIR/sources.mozbuild
+
+echo "Remove temporary directory."
+cd $BASE_DIR
+rm -rf $TEMP_DIR
+
+cd $BASE_DIR/$LIBVPX_SRC_DIR
+
+cd $BASE_DIR