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jianjunzjianjunz
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Add support for WebAssembly build.
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‎README.md

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# Open WebRTC Toolkit Native SDK
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## About this branch
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This branch is working on enabling WebAssembly build. Some WebRTC modules could be used for WebTransport and WebCodecs based streaming.
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## Introduction
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The Open WebRTC Toolkit(OWT) client SDK for native Windows/Linux/Android/iOS applications is built upon the W3C WebRTC standard to accelerate the development
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of real time communication applications on these platforms. It supports peer to peer communication, and conference mode communication working with

‎talk/owt/BUILD.gn

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# SPDX-License-Identifier: Apache-2.0
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import("//build_overrides/webrtc.gni")
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import("//talk/owt/sdk/wasm/gn/wasm.gni")
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import("//testing/test.gni")
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# Introduced for using libvpx config files. We only enable libvpx rate
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configs -= [ "//build/config/clang:find_bad_constructs" ]
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}
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}
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wasm_lib("owt_wasm") {
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name = "owt"
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deps = [ "//third_party/webrtc/modules/rtp_rtcp" ]
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sources=[
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"sdk/wasm/main.cc",
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]
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}
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static_library("owt_sdk_conf") {
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deps = [
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":owt_sdk_base",

‎talk/owt/sdk/wasm/gn/BUILD.gn

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# Copyright (C) <2021> Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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# Copyright (C) 2018 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This file is copied from third_party/perfetto/gn/standalone/toolchain/BUILD.gn with modifications.
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import("//build/config/compiler/compiler.gni")
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import("wasm.gni")
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template("gcc_like_toolchain") {
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toolchain(target_name) {
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ar = invoker.ar
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cc = invoker.cc
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cxx = invoker.cxx
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lib_switch = "-l"
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lib_dir_switch = "-L"
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ld_arg = ""
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external_cflags = ""
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external_cxxflags = ""
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external_ldflags = ""
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strip = ""
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if (defined(invoker.linker) && invoker.linker != "") {
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_invoker_linker = invoker.linker
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ld_arg = "-fuse-ld=$_invoker_linker"
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}
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if (defined(invoker.sysroot) && invoker.sysroot != "") {
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_invoker_sysroot = invoker.sysroot
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cc = "$cc --sysroot=$_invoker_sysroot"
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cxx = "$cxx --sysroot=$_invoker_sysroot"
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}
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if (defined(invoker.gcc_toolchain) && invoker.gcc_toolchain != "") {
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assert(is_clang, "gcc_toolchain can be used only when using clang")
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_invoker_gcc_toolchain = invoker.gcc_toolchain
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ld_arg = "$ld_arg --gcc-toolchain=$_invoker_gcc_toolchain"
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}
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if (defined(invoker.external_cflags)) {
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external_cflags = invoker.external_cflags
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}
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if (defined(invoker.external_cxxflags)) {
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external_cxxflags = invoker.external_cxxflags
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}
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if (defined(invoker.external_ldflags)) {
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external_ldflags = invoker.external_ldflags
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}
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if (defined(invoker.strip)) {
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strip = invoker.strip
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}
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# Object files go in this directory.
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object_subdir = "{{target_out_dir}}/{{label_name}}"
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tool("cc") {
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depfile = "{{output}}.d"
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command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -fno-stack-protector ${external_cflags} -msimd128 -pthread -D__wasm__ -c {{source}} -o {{output}}"
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depsformat = "gcc"
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outputs = [ "$object_subdir/{{source_name_part}}.o" ]
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description = "compile {{source}}"
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}
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tool("cxx") {
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depfile = "{{output}}.d"
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command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -fno-stack-protector ${external_cflags} -msimd128 -pthread -D__wasm__ ${external_cxxflags} -c {{source}} -o {{output}}"
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depsformat = "gcc"
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outputs = [ "$object_subdir/{{source_name_part}}.o" ]
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description = "compile {{source}}"
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}
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tool("asm") {
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depfile = "{{output}}.d"
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command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -fno-stack-protector -c {{source}} -o {{output}}"
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depsformat = "gcc"
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outputs = [ "$object_subdir/{{source_name_part}}.o" ]
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description = "assemble {{source}}"
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}
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tool("alink") {
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if (current_os == "aix") {
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# AIX does not support either -D (deterministic output) or response
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# files.
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command = "$ar -X64 {{arflags}} -r -c -s {{output}} {{inputs}}"
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} else {
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rspfile = "{{output}}.rsp"
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rspfile_content = "{{inputs}}"
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command = "$ar {{arflags}} -r -c -s -D {{output}} @\"$rspfile\""
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}
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# Remove the output file first so that ar doesn't try to modify the
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# existing file.
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if (host_os == "win") {
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tool_wrapper_path =
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rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir)
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command = "cmd /c $python_path $tool_wrapper_path delete-file {{output}} && $command"
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} else {
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command = "rm -f {{output}} && $command"
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}
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# Almost all targets build with //build/config/compiler:thin_archive which
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# adds -T to arflags.
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description = "AR {{output}}"
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outputs = [ "{{output_dir}}/{{target_output_name}}{{output_extension}}" ]
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# Shared libraries go in the target out directory by default so we can
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# generate different targets with the same name and not have them collide.
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default_output_dir = "{{target_out_dir}}"
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default_output_extension = ".a"
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output_prefix = "lib"
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}
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tool("solink") {
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soname = "{{target_output_name}}{{output_extension}}"
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unstripped_so = "{{root_out_dir}}/$soname"
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rpath = "-Wl,-soname,$soname"
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if (is_mac) {
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rpath = "-Wl,-install_name,@rpath/$soname"
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}
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command = "$cc_wrapper $cxx $ld_arg -shared ${external_ldflags} -fstack-protector {{inputs}} {{solibs}} {{libs}} $rpath -o $unstripped_so"
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outputs = [ unstripped_so ]
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output_prefix = "lib"
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default_output_extension = ".so"
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description = "link $unstripped_so"
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if (strip != "") {
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stripped_so = "{{root_out_dir}}/stripped/$soname"
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outputs += [ stripped_so ]
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command += " && $strip -o $stripped_so $unstripped_so"
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}
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}
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tool("link") {
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unstripped_exe =
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"{{root_out_dir}}/{{target_output_name}}{{output_extension}}"
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command = "$cc_wrapper $cxx $ld_arg ${external_ldflags} {{inputs}} {{solibs}} {{libs}} -o $unstripped_exe"
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outputs = [ unstripped_exe ]
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description = "link $unstripped_exe"
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if (strip != "") {
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stripped_exe = "{{root_out_dir}}/stripped/{{target_output_name}}{{output_extension}}"
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outputs += [ stripped_exe ]
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command += " && $strip -o $stripped_exe $unstripped_exe"
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}
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}
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tool("stamp") {
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command = "touch {{output}}"
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description = "stamp {{output}}"
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}
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tool("copy") {
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command = "cp -af {{source}} {{output}}"
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description = "COPY {{source}} {{output}}"
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}
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toolchain_args = {
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current_cpu = invoker.cpu
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current_os = invoker.os
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}
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}
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}
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gcc_like_toolchain("wasm") {
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# emsdk_dir and em_config are defined in wasm.gni.
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cpu = host_cpu
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os = host_os
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ar = "emar --em-config $em_config"
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cc = "emcc --em-config $em_config"
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cxx = "em++ --em-config $em_config"
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strip = ""
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}

‎talk/owt/sdk/wasm/gn/BUILDCONFIG.gn

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# Copyright (C) 2017 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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declare_args() {
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is_debug = true
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is_clang = true
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is_system_compiler = false
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is_lto = false
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# This is defined here because it's needed below for determining the value of
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# |is_cross_compiling|.
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target_triplet = ""
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}
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# Platform detection
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if (target_os == "") {
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target_os = host_os
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}
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if (current_os == "") {
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current_os = target_os
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}
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is_android = current_os == "android"
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is_chromeos = current_os == "chromeos"
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is_linux = current_os == "linux"
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is_linux_host = host_os == "linux"
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is_mac = current_os == "mac"
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is_mac_host = host_os == "mac"
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is_win = current_os == "win"
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is_win_host = host_os == "win"
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# Building with Windows/Fuchsia/nacl is currently only supported in the Chromium
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# tree so always set this to false.
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is_fuchsia = false
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is_nacl = false
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if (target_cpu == "") {
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target_cpu = host_cpu
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if (is_android) {
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target_cpu = "arm"
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}
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}
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if (current_cpu == "") {
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current_cpu = target_cpu
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}
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declare_args() {
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# the ossfuzz sanitizer overrides this to true. In that config the
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# host/target cpu and arch are identical, but we want to build only the
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# targets with the sanitizer/fuzzer flags
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is_cross_compiling =
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target_cpu != host_cpu || target_os != host_os || target_triplet != ""
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}
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default_configs = [
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"//gn/standalone:debug_symbols",
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"//gn/standalone:default",
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"//gn/standalone:c++11",
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"//gn/standalone:extra_warnings",
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"//gn/standalone:no_exceptions",
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"//gn/standalone:no_rtti",
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"//gn/standalone:visibility_hidden",
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"//gn/standalone/libc++:config",
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"//gn/standalone/sanitizers:sanitizers_cflags",
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]
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if (is_win) {
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default_configs += [ "//gn/standalone:win32_lean_and_mean" ]
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}
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if (!is_debug) {
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default_configs -= [ "//gn/standalone:debug_symbols" ]
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default_configs += [ "//gn/standalone:release" ]
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}
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set_defaults("source_set") {
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configs = default_configs
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}
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set_defaults("static_library") {
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configs = default_configs
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}
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# Realistically the only shared_library that we build right now is libc++.so
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# when use_custom_libcxx=true (on Linux). Hence don't add a dependency on
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# libc++ itself on these targets.
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set_defaults("shared_library") {
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configs = default_configs
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configs += [ "//gn/standalone:shared_library" ]
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# note: the following is not a nested config to be removable.
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configs += [ "//gn/standalone:android_liblog" ]
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}
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set_defaults("executable") {
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configs = default_configs
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configs += [ "//gn/standalone:executable" ]
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# note: the following is not a nested config to be removable.
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configs += [ "//gn/standalone:android_liblog" ]
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}
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if (is_win) {
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_default_toolchain = "//gn/standalone/toolchain:msvc"
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} else {
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_default_toolchain = "//gn/standalone/toolchain:gcc_like"
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}
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set_default_toolchain(_default_toolchain)
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if (is_cross_compiling) {
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host_toolchain = "//gn/standalone/toolchain:gcc_like_host"
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} else {
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host_toolchain = _default_toolchain
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}

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