1. windows10下编译32位和64位webrtc(m77)静态库

省略挂代理下载depot_tools以及webrtc代码的过程。。。

可参考webrtc编译

务必在 cmd 终端环境下进入到 webrtc\src 目录，再执行以下操作！

1.1. 环境配置

在系统环境变量下编辑PATH，将depot_tools所在路径放在PATH变量最前面。
设置环境变量 DEPOT_TOOLS_WIN_TOOLCHAIN=0

1.2. 编译流程

检出m77版本的webrtc

git checkout -b m77 remotes/branch-heads/m77

gclient sync -D

m77版本对应详情：

commit ad73985e75684cb4ac4dadb9d3d86ad0d66612a0 (HEAD -> m77, branch-heads/m77)

Author: Henrik Boström <hbos@webrtc.org>

Date:   Wed Aug 21 12:09:51 2019 +0200

Add implemented-but-missing members to RTCMediaStreamTrackStats::Members

...

配置编译参数

gn args out\m77

在弹出的 out\m77\args.gn 文本文件中输入编译参数，或者直接以命令行参数形式携带。

生成ninja编译脚本，并生成vs2017工程文件

gn gen out\m77 --ide=vs2017

使用ninja编译，将过程日志记录到文件

ninja -C out\m77 -d stats >> out\m77\comp.log

1.3. 先说遇到的问题

ImportError: No module named win32file

[236/2777] LIB obj/media/rtc_constants.lib

FAILED: obj/media/rtc_constants.lib

e:/google/depot_tools/bootstrap-2@3_8_10_chromium_23_bin/python/bin/python.exe ../../build/toolchain/win/tool_wrapper.py link-wrapper environment.x64 False lib.exe /nologo /ignore:4221 /OUT:obj/media/rtc_constants.lib @obj/media/rtc_constants.lib.rsp

Traceback (most recent call last):

File "../../build/toolchain/win/tool_wrapper.py", line 31, in <module>

    import win32file    # pylint: disable=import-error

ImportError: No module named win32file

[237/2777] CXX obj/logging/rtc_stream_config/rtc_stream_config.obj

参考Build issue with M76 version of webrtc on Windows

使用以下命令

python -m pip install pywin32

最好保证系统环境变量路径中没有其他版本的python影响。

然后继续执行编译流程中第4步。

fatal error C1189: #error: "See: bugs.webrtc.

这个问题在编译参数 is_clang=false 时才会出现

[1210/2535] CXX obj/modules/video_coding/webrtc_h264/h264_encoder_impl.obj

FAILED: obj/modules/video_coding/webrtc_h264/h264_encoder_impl.obj

...

E:\google\webrtc\src\modules/video_coding/codecs/h264/h264_encoder_impl.h(21): fatal error C1189: #error:  "See: bugs.webrtc.org/9213#c13."

注释掉该行之后继续执行编译流程中第4步，发现后续还会出现类似的报错

E:\google\webrtc\src\modules/video_coding/codecs/h264/h264_color_space.h(20): fatal error C1189: #error:  "See: bugs.webrtc.org/9213#c13."

E:\google\webrtc\src\modules/video_coding/codecs/h264/h264_decoder_impl.h(21): fatal error C1189: #error:  "See: bugs.webrtc.org/9213#c13."

，所以一次性注释掉三个文件中将会报错的行：See: bugs.webrtc.org/9213#c13.

modules/video_coding/codecs/h264/h264_decoder_impl.h(21)
modules/video_coding/codecs/h264/h264_encoder_impl.h(21)
modules/video_coding/codecs/h264/h264_color_space.h(20)

然后继续执行编译流程中第4步。

error C2059: 语法错误:“字符串”

[13/1314] CC obj/third_party/ffmpeg/ffmpeg_internal/pcm.obj

FAILED: obj/third_party/ffmpeg/ffmpeg_internal/pcm.obj

...

../../third_party/ffmpeg/libavcodec/pcm.c(629): error C2059: 语法错误:“字符串”

同样注释掉报错这一行，然后继续执行编译流程中第4步。

关于应用程序在webrtc.lib链接静态库时报错

Linker can't find CreatePeerConnectionFactory after M77 update

修改方法

148073: Add missing dependencies to the static library

然后重新生成会增加：create_peerconnection_factory.lib

同时更新：webrtc.lib

再次编译后报另外的连接错误：

1>webrtc.lib(http_common.obj) : error LNK2019: 无法解析的外部符号 _AcquireCredentialsHandleA@36，该符号在函数 "enum rtc::HttpAuthResult... 中被引用

1>webrtc.lib(http_common.obj) : error LNK2019: 无法解析的外部符号 __imp__FreeCredentialsHandle@4，该符号在函数 "public: virtual __thiscall rtc::`anonymous namespace'::NegotiateAuthContext::~NegotiateAuthContext(void)"... 中被引用

1>webrtc.lib(http_common.obj) : error LNK2019: 无法解析的外部符号 _InitializeSecurityContextA@48，该符号在函数 "enum rtc::HttpAuthResult... 中被引用

1>webrtc.lib(http_common.obj) : error LNK2019: 无法解析的外部符号 _CompleteAuthToken@8，该符号在函数 "enum rtc::HttpAuthResult __cdecl rtc::HttpAuthenticate... 中被引用

1>webrtc.lib(http_common.obj) : error LNK2019: 无法解析的外部符号 __imp__DeleteSecurityContext@4，该符号在函数 "public: virtual __thiscall rtc::`anonymous namespace'::NegotiateAuthContext::~NegotiateAuthContext(void)"... 中被引用

1>... : fatal error LNK1120: 5 个无法解析的外部命令

解决方法：

链接依赖库中增加Secur32.lib

微软的解释：包含了security.h的头文件要加#pragma comment(lib,"Secur32.lib")

AcquireCredentialsHandleA function (sspi.h)

在这两个文件中都有对security.h的引用：

rtc_base/http_common.cc:19:#include <security.h>

rtc_base/socket_adapters.cc:27:#include <security.h>

无法解析的外部符号 avpriv_emms_asm

这个问题在 is_clang=false 编译64位库之后链接webrtc静态库时出现

虽然生成了webrtc.lib，但在应用程序或者dll在链接webrtc时会报错

4>  正在创建库 ... 和对象 ...

4>webrtc.lib(autorename_libavcodec_utils.obj) : error LNK2019: 无法解析的外部符号 avpriv_emms_asm，该符号在函数 avcodec_default_execute 中被引用

4>webrtc.lib(decode.obj) : error LNK2001: 无法解析的外部符号 avpriv_emms_asm

4>webrtc.lib(vp3.obj) : error LNK2001: 无法解析的外部符号 avpriv_emms_asm

4>webrtc.lib(pcm.obj) : error LNK2001: 无法解析的外部符号 avpriv_emms_asm

4>E:\gitlab\sdk\zkms_client\build-win64\sdk\Debug\zkmsclient.dll : fatal error LNK1120: 1 个无法解析的外部命令

根据网上有限的资料显示，可能是X64不支持大多数汇编指令，webrtc源码的第三方目录ffmpeg里面有汇编代码。用clang编译没这个问题，但是clang编译的库vc不能引用。只能替换ffmpeg源码或者在windows上编译 好ffmpeg，然后将ffmpeg的include和lib文件添加到webrtc项目。

但是笔者后来使用clang编译的库在vc下仍能正常使用。

参考：

webrtc 支持openh264

在win10上编译webRTC（问题篇）

windows上编译webrtc_m84支持h.264编解码遇到的问题总结

webrtc 4577 version Build error，unresoved symbol avpriv_emms_asm, build with vs2017，x64

1.4. 编译参数

在 gn args out\m77 命令执行之后弹出的文本文件中就是编译时需要的所有参数，关于全部参数及说明可以使用命令 gn args out\m77 --list 查看。

1.4.1. 32位编译参数示例

# Build arguments go here.

# See "gn args <out_dir> --list" for available build arguments.

is_clang = true

is_debug = true

proprietary_codecs = true

rtc_build_examples = false

rtc_build_tools = false

rtc_include_internal_audio_device = false

rtc_include_pulse_audio = false

rtc_include_tests = false

rtc_libvpx_build_vp9 = false

rtc_use_gtk = false

rtc_use_h264 = true

target_cpu = "x86"

treat_warnings_as_errors = false

use_aura = false

use_custom_libcxx = false

use_gold = true

use_lld = false

use_ozone = true

use_rtti = true

1.4.2. 64位编译参数示例

只需将上述 target_cpu 的值换成 "x64" 即可。

1.5. 生成目标

如果一切顺利，最终生成一大堆lib文件，实际上我们只需要 webrtc.lib 文件足矣。

展开/折叠

out/m77/obj/api/audio_codecs/builtin_audio_decoder_factory.lib
out/m77/obj/api/audio_codecs/builtin_audio_encoder_factory.lib
out/m77/obj/api/audio_codecs/g711/audio_decoder_g711.lib
out/m77/obj/api/audio_codecs/g711/audio_encoder_g711.lib
out/m77/obj/api/audio_codecs/g722/audio_decoder_g722.lib
out/m77/obj/api/audio_codecs/g722/audio_encoder_g722.lib
out/m77/obj/api/audio_codecs/ilbc/audio_decoder_ilbc.lib
out/m77/obj/api/audio_codecs/ilbc/audio_encoder_ilbc.lib
out/m77/obj/api/audio_codecs/isac/audio_decoder_isac_float.lib
out/m77/obj/api/audio_codecs/isac/audio_encoder_isac_float.lib
out/m77/obj/api/audio_codecs/L16/audio_decoder_L16.lib
out/m77/obj/api/audio_codecs/L16/audio_encoder_L16.lib
out/m77/obj/api/audio_codecs/opus/audio_decoder_multiopus.lib
out/m77/obj/api/audio_codecs/opus/audio_decoder_opus.lib
out/m77/obj/api/audio_codecs/opus/audio_encoder_opus_config.lib
out/m77/obj/api/libjingle_peerconnection_api.lib
out/m77/obj/api/transport/goog_cc.lib
out/m77/obj/api/transport/network_control.lib
out/m77/obj/api/video/builtin_video_bitrate_allocator_factory.lib
out/m77/obj/api/video_codecs/builtin_video_decoder_factory.lib
out/m77/obj/api/video_codecs/builtin_video_encoder_factory.lib
out/m77/obj/api/video_codecs/rtc_software_fallback_wrappers.lib
out/m77/obj/api/video_codecs/vp8_temporal_layers_factory.lib
out/m77/obj/audio/audio.lib
out/m77/obj/audio/utility/audio_frame_operations.lib
out/m77/obj/call/call.lib
out/m77/obj/common_audio/common_audio.lib
out/m77/obj/common_audio/common_audio_sse2.lib
out/m77/obj/common_video/common_video.lib
out/m77/obj/logging/rtc_event_log_impl_encoder.lib
out/m77/obj/media/rtc_audio_video.lib
out/m77/obj/media/rtc_constants.lib
out/m77/obj/media/rtc_data.lib
out/m77/obj/media/rtc_encoder_simulcast_proxy.lib
out/m77/obj/media/rtc_internal_video_codecs.lib
out/m77/obj/media/rtc_media_base.lib
out/m77/obj/media/rtc_simulcast_encoder_adapter.lib
out/m77/obj/modules/audio_coding/audio_coding.lib
out/m77/obj/modules/audio_coding/audio_coding_opus_common.lib
out/m77/obj/modules/audio_coding/audio_encoder_cng.lib
out/m77/obj/modules/audio_coding/audio_network_adaptor.lib
out/m77/obj/modules/audio_coding/audio_network_adaptor_config.lib
out/m77/obj/modules/audio_coding/g711.lib
out/m77/obj/modules/audio_coding/g722.lib
out/m77/obj/modules/audio_coding/ilbc.lib
out/m77/obj/modules/audio_coding/isac.lib
out/m77/obj/modules/audio_coding/isac_c.lib
out/m77/obj/modules/audio_coding/isac_common.lib
out/m77/obj/modules/audio_coding/legacy_encoded_audio_frame.lib
out/m77/obj/modules/audio_coding/neteq.lib
out/m77/obj/modules/audio_coding/pcm16b.lib
out/m77/obj/modules/audio_coding/webrtc_cng.lib
out/m77/obj/modules/audio_coding/webrtc_multiopus.lib
out/m77/obj/modules/audio_coding/webrtc_opus.lib
out/m77/obj/modules/audio_mixer/audio_frame_manipulator.lib
out/m77/obj/modules/audio_mixer/audio_mixer_impl.lib
out/m77/obj/modules/audio_processing/aec3/aec3.lib
out/m77/obj/modules/audio_processing/audio_buffer.lib
out/m77/obj/modules/audio_processing/audio_processing.lib
out/m77/obj/modules/audio_processing/config.lib
out/m77/obj/modules/audio_processing/vad/vad.lib
out/m77/obj/modules/bitrate_controller/bitrate_controller.lib
out/m77/obj/modules/congestion_controller/congestion_controller.lib
out/m77/obj/modules/congestion_controller/goog_cc/goog_cc.lib
out/m77/obj/modules/congestion_controller/rtp/transport_feedback.lib
out/m77/obj/modules/desktop_capture/desktop_capture_differ_sse2.lib
out/m77/obj/modules/desktop_capture/desktop_capture_generic.lib
out/m77/obj/modules/desktop_capture/primitives.lib
out/m77/obj/modules/pacing/pacing.lib
out/m77/obj/modules/remote_bitrate_estimator/remote_bitrate_estimator.lib
out/m77/obj/modules/rtp_rtcp/rtp_rtcp.lib
out/m77/obj/modules/utility/utility.lib
out/m77/obj/modules/video_capture/video_capture_module.lib
out/m77/obj/modules/video_coding/encoded_frame.lib
out/m77/obj/modules/video_coding/nack_module.lib
out/m77/obj/modules/video_coding/packet.lib
out/m77/obj/modules/video_coding/video_coding.lib
out/m77/obj/modules/video_coding/webrtc_h264.lib
out/m77/obj/modules/video_coding/webrtc_multiplex.lib
out/m77/obj/modules/video_coding/webrtc_vp8.lib
out/m77/obj/modules/video_coding/webrtc_vp8_temporal_layers.lib
out/m77/obj/modules/video_coding/webrtc_vp9.lib
out/m77/obj/modules/video_coding/webrtc_vp9_helpers.lib
out/m77/obj/modules/video_processing/video_processing.lib
out/m77/obj/modules/video_processing/video_processing_sse2.lib
out/m77/obj/p2p/libstunprober.lib
out/m77/obj/p2p/rtc_p2p.lib
out/m77/obj/pc/peerconnection.lib
out/m77/obj/pc/rtc_pc_base.lib
out/m77/obj/rtc_base/experiments/alr_experiment.lib
out/m77/obj/rtc_base/experiments/audio_allocation_settings.lib
out/m77/obj/rtc_base/experiments/balanced_degradation_settings.lib
out/m77/obj/rtc_base/experiments/cpu_speed_experiment.lib
out/m77/obj/rtc_base/experiments/field_trial_parser.lib
out/m77/obj/rtc_base/experiments/jitter_upper_bound_experiment.lib
out/m77/obj/rtc_base/experiments/keyframe_interval_settings_experiment.lib
out/m77/obj/rtc_base/experiments/normalize_simulcast_size_experiment.lib
out/m77/obj/rtc_base/experiments/quality_scaler_settings.lib
out/m77/obj/rtc_base/experiments/quality_scaling_experiment.lib
out/m77/obj/rtc_base/experiments/rate_control_settings.lib
out/m77/obj/rtc_base/experiments/rtt_mult_experiment.lib
out/m77/obj/rtc_base/rtc_base.lib
out/m77/obj/rtc_base/rtc_numerics.lib
out/m77/obj/rtc_base/weak_ptr.lib
out/m77/obj/stats/rtc_stats.lib
out/m77/obj/system_wrappers/system_wrappers.lib
out/m77/obj/third_party/boringssl/boringssl.lib
out/m77/obj/third_party/boringssl/boringssl_asm.lib
out/m77/obj/third_party/ffmpeg/ffmpeg_internal.lib
out/m77/obj/third_party/ffmpeg/ffmpeg_nasm.lib
out/m77/obj/third_party/libjpeg_turbo/libjpeg.lib
out/m77/obj/third_party/libjpeg_turbo/simd.lib
out/m77/obj/third_party/libjpeg_turbo/simd_asm.lib
out/m77/obj/third_party/libsrtp/libsrtp.lib
out/m77/obj/third_party/libvpx/libvpx.lib
out/m77/obj/third_party/libvpx/libvpx_yasm.lib
out/m77/obj/third_party/openh264/openh264_common_yasm.lib
out/m77/obj/third_party/openh264/openh264_encoder_yasm.lib
out/m77/obj/third_party/openh264/openh264_processing_yasm.lib
out/m77/obj/third_party/opus/opus.lib
out/m77/obj/third_party/pffft/pffft.lib
out/m77/obj/third_party/usrsctp/usrsctp.lib
out/m77/obj/third_party/yasm/yasm_utils.lib
out/m77/obj/video/video.lib
out/m77/obj/webrtc.lib
out/m77/win_clang_x64/obj/third_party/libyuv/libyuv_internal.lib

1.6. 提取头文件和库文件

1.6.1. 库文件提取

新建批处理文件 gen-webrtc-lib.bat，键入以下内容。

echo off

:: 定义源目录

set sourcePath=E:\google\webrtc\src\out\m77\obj

:: 定义目标路径

set resulePath=E:\google\webrtc\lib

xcopy %sourcePath%\*.lib %resulePath%\  /s /c /y /h /r /f

pause

执行批处理文件 gen-webrtc-lib.bat，webrtc的所有编译好的库文件会拷贝到目标路径下。

1.6.2. 头文件提取

新建批处理文件 gen-webrtc-inc.bat，键入以下内容。

echo off

:: 定义源目录

set sourcePath=E:\google\webrtc\src

::set sourcePath=E:\google\depot_tools

:: 定义目标路径

set resulePath=E:\google\webrtc\include

::robocopy %sourcePath% %resulePath% *.bat *.cmd /s /log:robocopy-log.txt /xd .git bootstrap bootstrap-2@3_8_10_chromium_19_bin python

robocopy %sourcePath% %resulePath% *.h *.hpp *.hxx ^

  /s /mt /log:robocopy-log.txt /fp /ndl  ^

  /xd ^

  "%sourcePath%\.git" ^

  "%sourcePath%\build" ^

  "%sourcePath%\build_overrides" ^

  "%sourcePath%\buildtools" ^

  "%sourcePath%\data" ^

  "%sourcePath%\examples" ^

  "%sourcePath%\out" ^

  "%sourcePath%\rtc_tools" ^

  "%sourcePath%\resources" ^

  "%sourcePath%\test" ^

  "%sourcePath%\testing" ^

  "%sourcePath%\tools" ^

  "%sourcePath%\tools_webrtc" ^

  "%sourcePath%\third_party\blink" ^

  "%sourcePath%\third_party\depot_tools" ^

  "%sourcePath%\third_party\catapult"

pause

执行批处理文件 gen-webrtc-inc.bat，webrtc的头文件会以源目录结构形式拷贝到目标路径下。

windows10下编译32位和64位webrtc(m77)静态库的相关教程结束。