webrtc ios client 源码拉取和编译

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webrtc ios client 源码拉取和编译

环境

• Mac 10.13.1
• Xcode 9.1
• 翻墙代理：Lantern 4.4.1 (20171120.170626)
• Python 2.7.10

设置 git 代理

#设置git代理
$ git config --global http.proxy http://127.0.0.1:xxxx
$ git config --global https.proxy https://127.0.0.1:xxxx
#清空git代理
$ git config --global --unset http.proxy
$ git config --global --unset https.proxy

• 注意：代理地址的端口要用Lantern代理监听的端口地址

安装 Depot_tools

• git 命令获取 depot_tools：

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

• 配置坏境变量

$ echo -e "\nexport PATH=$PWD/depot_tools:$PATH" >> $HOME/.bash_profile
$ echo -e "\nexport DEPOT_TOOLS_UPDATE=0" >> $HOME/.bash_profile
$ source $HOME/.bash_profile

• 检测配置是否成功

$ echo $PATH

安装 ninja

• ninja 是 WebRTC 的编译工具，我们需要对其进行编译，步骤如下：

$ git clone git://github.com/martine/ninja.git
$ cd ninja/
$ ./bootstrap.py

• 复制到系统目录（也可配置坏境变量）

$ sudo cp ninja /usr/local/bin/
$ sudo chmod a+rx /usr/local/bin/ninja

设置 boto 代理

• 创建http_proxy.boto文件，在里面输入如下内容：

[Boto] 
proxy=127.0.0.1
proxy_port=xxxx #此端口号为Lantern的监听的端口号

• 配置坏境变量

$ echo -e "\nexport NO_AUTH_BOTO_CONFIG=$PWD/http_proxy.boto" >> $HOME/.bash_profile
$ source $HOME/.bash_profile

• 检测配置是否成功

$ echo $NO_AUTH_BOTO_CONFIG

下载源代码

$ export GYP_DEFINES="OS=ios"
$ fetch --nohooks webrtc_ios
$ gclient sync -r 6f21dc245689c29730002da09534a8d275e6aa92 --force
$ gclient runhooks

上面的 commit id 是 M62 版本最后一次 commit id，可以从 Release Notes 中找到，可替换成自己所需的版本的 commit id 或者直接使用最新的 commit id，如果gclient sync失败，请再次gclient sync

代码编译

$ gn gen out/ios --args='target_os="ios" additional_target_cpus=["arm"] target_cpu="arm64"' --ide=xcode
# gn gen out/Default --args="target_os=\"win\" target_cpu=\"x86\" is_debug=false" –ide=vs2017 
# windows版本
$ open -a Xcode.app out/ios/all.xcworkspace

编译Webrtc.framework动态库

$ ./tools_webrtc/ios/build_ios_libs.sh #编译完成后会在src文件夹下生成一个out_ios_libs的文件夹，编译好的动态库就在里面

看一下编译脚本build_ios_libs.py 如下：

#!/usr/bin/env python

# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.

"""WebRTC iOS FAT libraries build script.
Each architecture is compiled separately before being merged together.
By default, the library is created in out_ios_libs/. (Change with -o.)
"""

import argparse
import distutils.dir_util
import logging
import os
import shutil
import subprocess
import sys


os.environ['PATH'] = '/usr/libexec' + os.pathsep + os.environ['PATH']

SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
SRC_DIR = os.path.abspath(os.path.join(SCRIPT_DIR, '..', '..'))
sys.path.append(os.path.join(SRC_DIR, 'build'))
import find_depot_tools

SDK_OUTPUT_DIR = os.path.join(SRC_DIR, 'out_ios_libs') #编译动态库的输出路径，可以自己修改
SDK_LIB_NAME = 'librtc_sdk_objc.a'
SDK_FRAMEWORK_NAME = 'WebRTC.framework' #动态库的名称，可自己修改

DEFAULT_ARCHS = ENABLED_ARCHS = ['arm64', 'arm', 'x64', 'x86'] #支持的指令集
IOS_DEPLOYMENT_TARGET = '9.0' #支持的iOS系统版本
LIBVPX_BUILD_VP9 = False #是否编译VP9

sys.path.append(os.path.join(SCRIPT_DIR, '..', 'libs'))
from generate_licenses import LicenseBuilder


def _ParseArgs():
  parser = argparse.ArgumentParser(description=__doc__)
  parser.add_argument('-b', '--build_type', default='framework',
      choices=['framework', 'static_only'],
      help='The build type. Can be "framework" or "static_only". '
           'Defaults to "framework".')
  parser.add_argument('--build_config', default='release',
      choices=['debug', 'release'],
      help='The build config. Can be "debug" or "release". '
           'Defaults to "release".')
  parser.add_argument('--arch', nargs='+', default=DEFAULT_ARCHS,
      choices=ENABLED_ARCHS,
      help='Architectures to build. Defaults to %(default)s.')
  parser.add_argument('-c', '--clean', action='store_true', default=False,
      help='Removes the previously generated build output, if any.')
  parser.add_argument('-p', '--purify', action='store_true', default=False,
      help='Purifies the previously generated build output by '
           'removing the temporary results used when (re)building.')
  parser.add_argument('-o', '--output-dir', default=SDK_OUTPUT_DIR,
      help='Specifies a directory to output the build artifacts to. '
           'If specified together with -c, deletes the dir.')
  parser.add_argument('-r', '--revision', type=int, default=0,
      help='Specifies a revision number to embed if building the framework.')
  parser.add_argument('-e', '--bitcode', action='store_true', default=False,
      help='Compile with bitcode.')
  parser.add_argument('--verbose', action='store_true', default=False,
      help='Debug logging.')
  parser.add_argument('--use-goma', action='store_true', default=False,
      help='Use goma to build.')
  parser.add_argument('--extra-gn-args', default=[], nargs='*',
      help='Additional GN args to be used during Ninja generation.')

  return parser.parse_args()


def _RunCommand(cmd):
  logging.debug('Running: %r', cmd)
  subprocess.check_call(cmd, cwd=SRC_DIR)


def _CleanArtifacts(output_dir):
  if os.path.isdir(output_dir):
    logging.info('Deleting %s', output_dir)
    shutil.rmtree(output_dir)


def _CleanTemporary(output_dir, architectures):
  if os.path.isdir(output_dir):
    logging.info('Removing temporary build files.')
    for arch in architectures:
      arch_lib_path = os.path.join(output_dir, arch + '_libs')
      if os.path.isdir(arch_lib_path):
        shutil.rmtree(arch_lib_path)


def BuildWebRTC(output_dir, target_arch, flavor, gn_target_name,
                ios_deployment_target, libvpx_build_vp9, use_bitcode,
                use_goma, extra_gn_args, static_only):
  output_dir = os.path.join(output_dir, target_arch + '_libs')
  gn_args = ['target_os="ios"', 'ios_enable_code_signing=false',
             'use_xcode_clang=true', 'is_component_build=false']

  # Add flavor option.
  if flavor == 'debug':
    gn_args.append('is_debug=true')
  elif flavor == 'release':
    gn_args.append('is_debug=false')
  else:
    raise ValueError('Unexpected flavor type: %s' % flavor)

  gn_args.append('target_cpu="%s"' % target_arch)

  gn_args.append('ios_deployment_target="%s"' % ios_deployment_target)

  gn_args.append('rtc_libvpx_build_vp9=' +
                 ('true' if libvpx_build_vp9 else 'false'))

  gn_args.append('enable_ios_bitcode=' +
                 ('true' if use_bitcode else 'false'))
  gn_args.append('use_goma=' + ('true' if use_goma else 'false'))

  args_string = ' '.join(gn_args + extra_gn_args)
  logging.info('Building WebRTC with args: %s', args_string)

  cmd = [
    sys.executable,
    os.path.join(find_depot_tools.DEPOT_TOOLS_PATH, 'gn.py'),
    'gen',
    output_dir,
    '--args=' + args_string,
  ]
  _RunCommand(cmd)
  logging.info('Building target: %s', gn_target_name)

  cmd = [
    os.path.join(find_depot_tools.DEPOT_TOOLS_PATH, 'ninja'),
    '-C',
    output_dir,
    gn_target_name,
  ]
  if use_goma:
    cmd.extend(['-j', '200'])
  _RunCommand(cmd)

  # Strip debug symbols to reduce size.
  if static_only:
    gn_target_path = os.path.join(output_dir, 'obj', 'sdk',
                                  'lib%s.a' % gn_target_name)
    cmd = ['strip', '-S', gn_target_path, '-o',
           os.path.join(output_dir, 'lib%s.a' % gn_target_name)]
    _RunCommand(cmd)


def main():
  args = _ParseArgs()

  logging.basicConfig(level=logging.DEBUG if args.verbose else logging.INFO)

  if args.clean:
    _CleanArtifacts(args.output_dir)
    return 0

  architectures = list(args.arch)
  gn_args = args.extra_gn_args

  if args.purify:
    _CleanTemporary(args.output_dir, architectures)
    return 0

  # Ignoring x86 except for static libraries for now because of a GN build issue
  # where the generated dynamic framework has the wrong architectures.
  if 'x86' in architectures and args.build_type != 'static_only':
    architectures.remove('x86')

  # Generate static or dynamic.
  if args.build_type == 'static_only':
    gn_target_name = 'rtc_sdk_objc'
  elif args.build_type == 'framework':
    gn_target_name = 'framework_objc'
    if not args.bitcode:
      gn_args.append('enable_dsyms=true')
    gn_args.append('enable_stripping=true')
  else:
    raise ValueError('Build type "%s" is not supported.' % args.build_type)


  # Build all architectures.
  for arch in architectures:
    BuildWebRTC(args.output_dir, arch, args.build_config, gn_target_name,
                IOS_DEPLOYMENT_TARGET, LIBVPX_BUILD_VP9, args.bitcode,
                args.use_goma, gn_args, args.build_type == 'static_only')

  # Create FAT archive.
  if args.build_type == 'static_only':
    lib_paths = [os.path.join(args.output_dir, arch + '_libs', SDK_LIB_NAME)
                 for arch in architectures]
    out_lib_path = os.path.join(args.output_dir, SDK_LIB_NAME)
    # Combine the slices.
    cmd = ['lipo'] + lib_paths + ['-create', '-output', out_lib_path]
    _RunCommand(cmd)

  elif args.build_type == 'framework':
    lib_paths = [os.path.join(args.output_dir, arch + '_libs')
                 for arch in architectures]

    # Combine the slices.
    dylib_path = os.path.join(SDK_FRAMEWORK_NAME, 'WebRTC')
    # Dylibs will be combined, all other files are the same across archs.
    # Use distutils instead of shutil to support merging folders.
    distutils.dir_util.copy_tree(
        os.path.join(lib_paths[0], SDK_FRAMEWORK_NAME),
        os.path.join(args.output_dir, SDK_FRAMEWORK_NAME))
    logging.info('Merging framework slices.')
    dylib_paths = [os.path.join(path, dylib_path) for path in lib_paths]
    out_dylib_path = os.path.join(args.output_dir, dylib_path)
    try:
      os.remove(out_dylib_path)
    except OSError:
      pass
    cmd = ['lipo'] + dylib_paths + ['-create', '-output', out_dylib_path]
    _RunCommand(cmd)

    # Merge the dSYM slices.
    lib_dsym_dir_path = os.path.join(lib_paths[0], 'WebRTC.dSYM')
    if os.path.isdir(lib_dsym_dir_path):
      distutils.dir_util.copy_tree(lib_dsym_dir_path,
                                   os.path.join(args.output_dir, 'WebRTC.dSYM'))
      logging.info('Merging dSYM slices.')
      dsym_path = os.path.join('WebRTC.dSYM', 'Contents', 'Resources', 'DWARF',
                               'WebRTC')
      lib_dsym_paths = [os.path.join(path, dsym_path) for path in lib_paths]
      out_dsym_path = os.path.join(args.output_dir, dsym_path)
      try:
        os.remove(out_dsym_path)
      except OSError:
        pass
      cmd = ['lipo'] + lib_dsym_paths + ['-create', '-output', out_dsym_path]
      _RunCommand(cmd)

    # Generate the license file.
    ninja_dirs = [os.path.join(args.output_dir, arch + '_libs')
                  for arch in architectures]
    gn_target_full_name = '//sdk:' + gn_target_name
    builder = LicenseBuilder(ninja_dirs, [gn_target_full_name])
    builder.GenerateLicenseText(
        os.path.join(args.output_dir, SDK_FRAMEWORK_NAME))


    # Modify the version number.
    # Format should be <Branch cut MXX>.<Hotfix #>.<Rev #>.
    # e.g. 55.0.14986 means branch cut 55, no hotfixes, and revision 14986.
    infoplist_path = os.path.join(args.output_dir, SDK_FRAMEWORK_NAME,
                                  'Info.plist')
    cmd = ['PlistBuddy', '-c',
           'Print :CFBundleShortVersionString', infoplist_path]
    major_minor = subprocess.check_output(cmd).strip()
    version_number = '%s.%s' % (major_minor, args.revision)
    logging.info('Substituting revision number: %s', version_number)
    cmd = ['PlistBuddy', '-c',
           'Set :CFBundleVersion ' + version_number, infoplist_path]
    _RunCommand(cmd)
    _RunCommand(['plutil', '-convert', 'binary1', infoplist_path])

  logging.info('Done.')
  return 0


if __name__ == '__main__':
  sys.exit(main())