WEBRTC系列之基于IOS平台编译WEBRTC（一）
已经编译过的代码地址 ：https://github.com/starmier/SMWebRTC
1、下载工具
1.1、下载 depot_tools
hjsddeMacBook-Pro:webrtc starmier$ git clone https://chromium.googlesource.com/chromium/tools/depot_tools
Cloning into 'depot_tools'...
remote: Sending approximately 27.10 MiB ...
remote: Total 35211 (delta 24488), reused 35211 (delta 24488)
Receiving objects: 100% (35211/35211), 27.10 MiB | 461.00 KiB/s, done.
Resolving deltas: 100% (24488/24488), done.
hjsddeMacBook-Pro:webrtc starmier$ pwd
1.2、配置 depot_tools 环境
hjsddeMacBook-Pro:depot_tools starmier$ pwd
/MYPROJECT/webrtc/depot_tools
hjsddeMacBook-Pro:depot_tools starmier$ export PATH=$PATH:/MYPROJECT/webrtc/depot_tools
hjsddeMacBook-Pro:depot_tools starmier$ fetch --help
usage: fetch.py [options] <config> [--property=value [--property2=value2 ...]]
This script can be used to download the Chromium sources. See
http://www.chromium.org/developers/how-tos/get-the-code
for full usage instructions.
Valid options:
-h, --help, help Print this message.
--nohooks Don't run hooks after checkout.
--force (dangerous) Don't look for existing .gclient file.
-n, --dry-run Don't run commands, only print them.
--no-history Perform shallow clones, don't fetch the full git history.
Valid fetch configs:
android
android_internal
breakpad
chromium
config_util
crashpad
dart
depot_tools
goma_client
gyp
infra
infra_internal
inspector_protocol
ios
ios_internal
nacl
naclports
node-ci
pdfium
skia
skia_buildbot
syzygy
v8
webrtc
webrtc_android
webrtc_ios
hjsddeMacBook-Pro:depot_tools starmier$
1.3、下载源码
源码下载成功后的文件在一个自动生成的src目录下面（这个下载特别就，用了4个小时）
hjsddeMacBook-Pro:webrtc starmier$ fetch --nohooks webrtc_ios
Running: gclient root
WARNING: Your metrics.cfg file was invalid or nonexistent. A new one will be created.
Running: gclient config --spec 'solutions = [
{
"url": "https://webrtc.googlesource.com/src.git",
"managed": False,
"name": "src",
"deps_file": "DEPS",
"custom_deps": {},
},
]
target_os = ["ios", "mac"]
'
Running: gclient sync --nohooks --with_branch_heads
1>________ running 'git -c core.deltaBaseCacheLimit=2g clone --no-checkout --progress https://webrtc.googlesource.com/src.git /MYPROJECT/webrtc/_gclient_src_iW0YLg' in '/MYPROJECT/webrtc'
1>Cloning into '/MYPROJECT/webrtc/_gclient_src_iW0YLg'...
1>remote: Sending approximately 252.62 MiB ...
1>Receiving objects: 10% (33799/336896), 14.06 MiB | 456.00 KiB/s
......
[4:13:10] Still working on:
[4:13:10] src/third_party/icu
[4:13:20] Still working on:
[4:13:20] src/third_party/icu
[4:13:30] Still working on:
[4:13:30] src/third_party/icu
[4:13:40] Still working on:
[4:13:40] src/third_party/icu
[4:13:50] Still working on:
[4:13:50] src/third_party/icu
[4:13:53] Still working on:
[4:13:53] src/third_party/icu
Syncing projects: 100% (38/38), 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
2、与远端 repo 进行代码同步
与远端 repo 进行代码同步，在终端执行命令。这条命令执行时，要下载的文件比较多，需要耐心等待命令的执行结果。（我用了大概半个多种）
hjsddeMacBook-Pro:webrtc starmier$ gclient sync
Syncing projects: 100% (38/38), done.
Running hooks: 45% (10/22) mac_toolchain
________ running 'vpython src/build/mac_toolchain.py' in '/MYPROJECT/webrtc'
Skipping Mac toolchain installation for mac
Running hooks: 54% (12/22) clang
________ running 'vpython src/tools/clang/scripts/update.py' in '/MYPROJECT/webrtc'
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-373424-64a362e7-1.tgz .......... Done.
Hook 'vpython src/tools/clang/scripts/update.py' took 62.36 secs
Running hooks: 68% (15/22) clang_format_mac
________ running 'download_from_google_storage --no_resume --platform=darwin --no_auth --bucket chromium-clang-format -s src/buildtools/mac/clang-format.sha1' in '/MYPROJECT/webrtc'
0> Downloading src/buildtools/mac/clang-format...
Downloading 1 files took 41.859609 second(s)
Hook 'download_from_google_storage --no_resume --platform=darwin --no_auth --bucket chromium-clang-format -s src/buildtools/mac/clang-format.sha1' took 41.99 secs
Running hooks: 100% (22/22)
________ running 'download_from_google_storage --directory --recursive --num_threads=10 --no_auth --quiet --bucket chromium-webrtc-resources src/resources' in '/MYPROJECT/webrtc'
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8> Downloading src/resources/media/faces_I420.jpg...
2> Downloading src/resources/media/h264-svc-99-640x360.rtpdump...
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9> Downloading src/resources/media/video.rtpdump...
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Downloading 263 files took 2031.337688 second(s)
Hook 'download_from_google_storage --directory --recursive --num_threads=10 --no_auth --quiet --bucket chromium-webrtc-resources src/resources' took 2033.11 secs
Running hooks: 100% (22/22), done.
我这里下载的很顺畅，整个过程中木有出现什么异常点。但网上有说下面这种情况，这里也记录一下吧：
出现了错误 “Error: Command ‘/usr/bin/python src/tools/clang/scripts/update.py’”，暂时不用管，继续后续的步骤。
执行结果中的 `src/tools/clang/scripts/update.py`, [https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-359912-2.tgz](https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/clang-359912-2.tgz) 后面的步骤会用到。
3、编译
在执行编译前，我们需要配置好编译的参数和环境，生产出构建文件。这里就需要用到 GN 这个工具了。GN 是一个为 Ninja 生成构建文件的元构建系统。Ninja 是一个小型构建系统，特点是构建速度快。
3.1、使用 GN 来生产 Ninja 工程文件，在终端执行命令
hjsddeMacBook-Pro:webrtc starmier$ gn gen out/ios --args='target_os="ios" target_cpu="arm64" is_debug=true'
ERROR Can't find source root.
I could not find a ".gn" file in the current directory or any parent,
and the --root command-line argument was not specified.
此时报错，不要惊慌，看看提示，找不到对应文件，因为我们没有跳转到下载源码时自动生成的文件夹src。跳转后，再次执行此命令就可以了。
hjsddeMacBook-Pro:webrtc starmier$ cd src
hjsddeMacBook-Pro:src starmier$ ls
AUTHORS call pylintrc
BUILD.gn codereview.settings resources
CODE_OF_CONDUCT.md common_audio rtc_base
DEPS common_types.h rtc_tools
ENG_REVIEW_OWNERS common_video sdk
LICENSE data stats
OWNERS docs style-guide
PATENTS examples style-guide.md
PRESUBMIT.py ios system_wrappers
README.chromium license_template.txt test
README.md logging testing
WATCHLISTS media third_party
abseil-in-webrtc.md modules tools
api native-api.md tools_webrtc
audio out video
base p2p webrtc.gni
build pc whitespace.txt
build_overrides presubmit_test.py
buildtools presubmit_test_mocks.py
hjsddeMacBook-Pro:src starmier$ gn gen out/ios --args='target_os="ios" target_cpu="arm64" is_debug=true'
Warning: Multiple codesigning identities match "iPhone Developer"
Warning: - 17533420CE1F65FDB21F9F8436BD6B5962F9BC72 (selected)
Warning: - CDB55FFB48B60EB4E9A2E16C741BBDF8BDDCB29E
Warning: Please use either ios_code_signing_identity or
Warning: ios_code_signing_identity_description variable to
Warning: control which identity is selected.
Done. Made 1362 targets from 195 files in 7899ms
产生的工程文件在目录 /src/out/ios 下。通过命令查看下改目录下有哪些文件，在终端执行命令
hjsddeMacBook-Pro:src starmier$ ls out/ios
args.gn
build.ninja
build.ninja.d
clang_x64
low_bandwidth_audio_perf_test.runtime_deps
obj
toolchain.ninja
hjsddeMacBook-Pro:src starmier$
3.2、编译 APP 工程，在终端执行命令
hjsddeMacBook-Pro:src starmier$ ninja -C out/ios AppRTCMobile
ninja: Entering directory `out/ios'
[2774/2775] CODE SIGNING //examples:Ap...//build/toolchain/mac:ios_clang_arm64)
FAILED: AppRTCMobile.app/AppRTCMobile AppRTCMobile.app/_CodeSignature/CodeResources AppRTCMobile.app/embedded.mobileprovision AppRTCMobile.app/Info.plist
python ../../build/config/ios/codesign.py code-sign-bundle -t=iphoneos -i=17533420CE1F65FDB21F9F8436BD6B5962F9BC72 -b=obj/examples/AppRTCMobile -e=../../build/config/ios/entitlements.plist AppRTCMobile.app -P=../../build/config/mac/plist_util.py -p=gen/examples/AppRTCMobile_generate_info_plist.plist -p=gen/examples/AppRTCMobile_partial_info.plist
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/f0b09b20-9e0f-400d-8d56-f89029620dda.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/50a2c8e7-5812-4695-ac90-ad1a4b5f72cb.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/3a913d08-6538-43c6-a1b3-0ee72d433ff5.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/182da8c1-a9e5-444e-b7c2-a6eaa82f9377.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/e9a87d16-3c5e-44b1-b196-74cbd677bb42.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/fcc37234-6f39-4142-988f-936c5ccb1553.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/f971d35b-70ef-43d8-b82c-f63d68f2678a.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/42797ccd-9e74-4568-b09f-1e6d5bd87bd9.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/05a615d5-cc11-4e11-be31-476d421a3835.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/babb92cb-5cf9-4d5f-825f-73dc3f29bcde.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/512a7bed-746c-4d61-a9cd-32920cce351f.mobileprovision.
Error: no mobile provisioning profile found for "com.google.AppRTCMobile".
ninja: build stopped: subcommand failed.
至此，编译 APP 的过程结束了, 编译过程的其它环节正确无误。虽然出现了 “Error: no mobile provisioning profile found for “com.google.AppRTCMobile”.” 的报错，这个 Error 信息表示 APP 的包名 “com.google.AppRTCMobile” 没有与之对应的苹果开发者证书的配置文件，将该 APP 安装到手机上后，会因证书配置文件的问题无法使用。这个问题很好解决，就是改 APP 的包名，在编译的时候选择对应的苹果开发者证书的配置文件后，重新编译就行了。解决方法：
默认的bundle identity是不能产生供应配置文件的（providing file）；
例如找到定义了默认的bundle identity地方；
webrtc/sdk/objc/Framework/Info.plist:10: org.webrtc.WebRTC
webrtc/examples/objc/AppRTCMobile/ios/Info.plist:24: com.google.AppRTCMobile
用自己的bundle identity替换掉就可以了。
怎么找到自己的bundle identity呢？Xcode->preference->AppleID里找到有效的 providing file。
hjsddeMacBook-Pro:src starmier$ ninja -C out/ios AppRTCMobile
ninja: Entering directory `out/ios'
[26/27] CODE SIGNING //examples:AppRTC...//build/toolchain/mac:ios_clang_arm64)
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/f0b09b20-9e0f-400d-8d56-f89029620dda.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/50a2c8e7-5812-4695-ac90-ad1a4b5f72cb.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/3a913d08-6538-43c6-a1b3-0ee72d433ff5.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/182da8c1-a9e5-444e-b7c2-a6eaa82f9377.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/e9a87d16-3c5e-44b1-b196-74cbd677bb42.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/fcc37234-6f39-4142-988f-936c5ccb1553.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/f971d35b-70ef-43d8-b82c-f63d68f2678a.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/42797ccd-9e74-4568-b09f-1e6d5bd87bd9.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/05a615d5-cc11-4e11-be31-476d421a3835.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/babb92cb-5cf9-4d5f-825f-73dc3f29bcde.mobileprovision.
Warning: ignoring expired provisioning profile: /Users/hjsd/Library/MobileDevice/Provisioning Profiles/512a7bed-746c-4d61-a9cd-32920cce351f.mobileprovision.
[27/27] STAMP obj/examples/AppRTCMobile.stamp
进入目录 /src/out/ios 可以看下编译后产生了哪些文件。在终端执行命令
hjsddeMacBook-Pro:src starmier$ ls out/ios
AppRTCMobile.app
WebRTC.framework
args.gn
build.ninja
build.ninja.d
clang_x64
gen
low_bandwidth_audio_perf_test.runtime_deps
obj
pyproto
toolchain.ninja
在这一步，其实可以得到我想要的 WebRTC 库文件了，即 WebRTC.framework。但这不是正常获取库文件的路子。编译 WebRTC 库文件的方法有2种，分别为 ninja 命令行，python 脚本。
hjsddeMacBook-Pro:src starmier$ ninja -C out/ios framework_objc
ninja: Entering directory `out/ios'
ninja: no work to do.
可以看到 “ninja: no work to do.”，为什么会提示这条信息呢？原因在于上一步骤中已经编译产生了 WebRTC.framework 库文件。如果想看看只编译库文件的过程，那可以不执行上一步骤中编译 APP 的环节，即不执行命令 ninja -C out/ios AppRTCMobile，现在的情况是我们已经执行了该条命令，那直接删掉已经存在的 WebRTC.framework 库文件就行了。在终端执行命令
hjsddeMacBook-Pro:src starmier$ rm -rf out/ios/WebRTC.framework
hjsddeMacBook-Pro:src starmier$ ninja -C out/ios framework_objc
ninja: Entering directory `out/ios'
[97/97] STAMP obj/sdk/framework_objc.stamp
查看支持的类型：
hjsddeMacBook-Pro:src starmier$ lipo -info /MYPROJECT/webrtc/src/out/ios/WebRTC.framework/WebRTC
Architectures in the fat file: /MYPROJECT/webrtc/src/out/ios/WebRTC.framework/WebRTC are: arm64
方法二：
hjsddeMacBook-Pro:src starmier$ python tools_webrtc/ios/build_ios_libs.py --bitcode
INFO:root:Building WebRTC with args: target_os="ios" ios_enable_code_signing=false use_xcode_clang=true is_component_build=false is_debug=false target_cpu="arm64" ios_deployment_target="10.0" rtc_libvpx_build_vp9=false enable_ios_bitcode=true use_goma=false enable_stripping=true
Done. Made 1360 targets from 195 files in 1580ms
INFO:root:Building target: framework_objc
ninja: Entering directory `/MYPROJECT/webrtc/src/out_ios_libs/arm64_libs'
ninja: no work to do.
INFO:root:Building WebRTC with args: target_os="ios" ios_enable_code_signing=false use_xcode_clang=true is_component_build=false is_debug=false target_cpu="arm" ios_deployment_target="10.0" rtc_libvpx_build_vp9=false enable_ios_bitcode=true use_goma=false enable_stripping=true
Done. Made 1361 targets from 195 files in 1775ms
INFO:root:Building target: framework_objc
ninja: Entering directory `/MYPROJECT/webrtc/src/out_ios_libs/arm_libs'
ninja: no work to do.
INFO:root:Building WebRTC with args: target_os="ios" ios_enable_code_signing=false use_xcode_clang=true is_component_build=false is_debug=false target_cpu="x64" ios_deployment_target="10.0" rtc_libvpx_build_vp9=false enable_ios_bitcode=true use_goma=false enable_stripping=true
Done. Made 1386 targets from 198 files in 1739ms
INFO:root:Building target: framework_objc
ninja: Entering directory `/MYPROJECT/webrtc/src/out_ios_libs/x64_libs'
ninja: no work to do.
INFO:root:Building WebRTC with args: target_os="ios" ios_enable_code_signing=false use_xcode_clang=true is_component_build=false is_debug=false target_cpu="x86" ios_deployment_target="10.0" rtc_libvpx_build_vp9=false enable_ios_bitcode=true use_goma=false enable_stripping=true
Done. Made 1386 targets from 198 files in 1467ms
INFO:root:Building target: framework_objc
ninja: Entering directory `/MYPROJECT/webrtc/src/out_ios_libs/x86_libs'
ninja: no work to do.
INFO:root:Merging framework slices.
INFO:root:Done.
生成的库文件在 out_ios_lib 目录下。脚本 tools_webrtc/ios/build_ios_libs.py 默认编译的架构是 DEFAULT_ARCHS = ENABLED_ARCHS = [‘arm64’, ‘arm’, ‘x64’, ‘x86’]，编译出来的库为动态库。查看库支持的架构，以及是静态库还是动态库，在终端执行命令
hjsddeMacBook-Pro:src starmier$ lipo -info out_ios_libs/WebRTC.framework/WebRTC
Architectures in the fat file: out_ios_libs/WebRTC.framework/WebRTC are: x86_64 i386 armv7 arm64
提示：使用了动态库的 APP 在上架 APP Store 时，会报错不支持模拟器架构 [‘x64’, ‘x86’]，所以，需要剔除动态库中的模拟器架构，只使用真机架构 [‘arm64’, ‘arm’]。
可以修改脚本 tools_webrtc/ios/build_ios_libs.py 中的参数，将编译的架构改成 DEFAULT_ARCHS = ENABLED_ARCHS = [‘arm64’]。为什么去掉了 arm？因为现在人们使用的苹果设备几乎都是 arm64 架构了，arm 架构的苹果设备几乎绝迹，去掉 arm，也可以减轻 WebRTC 库的体积。
最后就是打开xcode工程了
open -a Xcode.app out/ios/all.xcworkspace
具体命令也可以直接参考源码里面下面目录中的命令，
本文为个人学习笔记，如有错误还请指正，谢谢。
特别感谢Minmin.sun的文章作为参考。