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WebRTC 开发（十三）编译与运行 Android 工程

发表于 分类于

WebRTC 版本

Release notes

branches

m108

版本 分支 commit
m108 branch-heads/5359 93081d5

操作系统类型

MacOS

下载 depot_tools 工具

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mkdir -p webrtc

cd webrtc

git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git

配置 depot_tools 工具的路径

在终端执行命令：

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vi ~/.zshrc

往 ~/.zshrc 文件中添加路径：

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export webrtc_depot_tools=/Users/suntongmian/Documents/workplace/webrtc/depot_tools
export PATH=$PATH:$webrtc_depot_tools

让修改生效，在终端执行命令：

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source ~/.zshrc

下载 Android 平台代码

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cd webrtc

fetch --nohooks webrtc_android

执行过程如下：

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➜  webrtc fetch --nohooks webrtc_android                  
Running: gclient root
Updating depot_tools...
WARNING: Your metrics.cfg file was invalid or nonexistent. A new one will be created.
Running: gclient config --spec 'solutions = [
  {
    "name": "src",
    "url": "https://webrtc.googlesource.com/src.git",
    "deps_file": "DEPS",
    "managed": False,
    "custom_deps": {},
  },
]
target_os = ["android", "unix"]
'
Updating depot_tools...
Running: gclient sync --nohooks --with_branch_heads
Updating depot_tools...

......

[0:32:15] Still working on:
[0:32:15]   src/third_party/android_ndk
Syncing projects: 100% (243/243), done.                     
Running: git submodule foreach 'git config -f $toplevel/.git/config submodule.$name.ignore all'
Running: git config --add remote.origin.fetch '+refs/tags/*:refs/tags/*'
Running: git config diff.ignoreSubmodules all

下载指定的 WebRTC 版本

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cd webrtc

gclient sync -r 93081d5 --force

执行过程如下：

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➜  webrtc gclient sync -r 93081d5 --force                                           
Updating depot_tools...
Syncing projects: 100% (242/242), done. 

......

Hook 'download_from_google_storage --directory --recursive --num_threads=10 --no_auth --quiet --bucket chromium-webrtc-resources src/resources' took 367.89 secs
Hook 'vpython3 src/testing/generate_location_tags.py --out src/testing/location_tags.json' took 36.50 secs
Running hooks: 100% (29/29), done.

创建 Android 工程

生成 Android 平台的 Android Studio 工程，在终端执行命令：

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cd webrtc

cd src

gn gen out/android --args='target_os="android" target_cpu="arm64" is_debug=true'

执行结果：

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ERROR Unresolved dependencies.
//examples/androidapp/third_party/autobanh:autobanh_java__header(//build/toolchain/android:android_clang_arm64)
  needs //third_party/ijar:ijar(//build/toolchain/mac:clang_x64)
//third_party/accessibility_test_framework:accessibility_test_framework_java__header(//build/toolchain/android:android_clang_arm64)
  needs //third_party/ijar:ijar(//build/toolchain/mac:clang_x64)
  
......

在 macOS 系统上生成 WebRTC Android 工程报错了。如何解决？

Supported to compile webRTC for Android on a Mac? 提到“WebRTC android development is not supported on mac”。官方解释不支持在 Mac 设备上编译 Android 平台的 WebRTC。

如果要在 Mac 设备上编译 Android 平台的 WebRTC 工程，该怎么办？

根据错误提示“ERROR Unresolved dependencies. needs //third_party/ijar:ijar(//build/toolchain/mac:clang_x64)”，查看 webrtc/src/third_party/ijar/BUILD.gn 文件的内容。

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➜  src git:(93081d594f) cat third_party/ijar/BUILD.gn        
# Copyright 2015 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# A tool that removes all non-interface-specific parts from a .jar file.

if (is_linux || is_chromeos) {
  config("ijar_compiler_flags") {
    if (is_clang) {
      cflags = [
        "-Wno-shadow",
        "-Wno-unused-but-set-variable",
      ]
    }
  }

  executable("ijar") {
    sources = [
      "classfile.cc",
      "common.h",
      "ijar.cc",
      "mapped_file.h",
      "mapped_file_unix.cc",
      "platform_utils.cc",
      "platform_utils.h",
      "zip.cc",
      "zip.h",
      "zlib_client.cc",
      "zlib_client.h",
    ]

    deps = [ "//third_party/zlib" ]

    configs += [ ":ijar_compiler_flags" ]

    # Always build release since this is a build tool.
    if (is_debug) {
      configs -= [ "//build/config:debug" ]
      configs += [ "//build/config:release" ]
    }
  }
}

将 if (is_linux || is_chromeos) 修改为 if (is_linux || is_chromeos || is_mac) ，让 gn 支持 Mac 设备编译 Android 平台的 WebRTC 工程。

再次在终端执行命令：

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cd webrtc

cd src

gn gen out/android --args='target_os="android" target_cpu="arm64" is_debug=true'

执行结果：

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➜  src git:(93081d594f) gn gen out/android --args='target_os="android" target_cpu="arm64" is_debug=true'
Done. Made 6591 targets from 356 files in 2002ms

在终端执行命令：

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autoninja -C out/android -t targets all

启动 Android Studio 工程

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open -a Android\ Studio ./out/android

参考文献

[1] WebRTC Android development