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API header files

As a user of the WebRTC library, you may use headers and build files in the following directories:

API directory Including subdirectories?
api Yes

For now, you may also use headers and build files in the following legacy API directories—but see the disclaimer below.

Legacy API directory Including subdirectories?
common_audio/include No
media/base No
media/engine No
modules/audio_coding/include No
modules/audio_device/include No
modules/audio_processing/include No
modules/bitrate_controller/include No
modules/congestion_controller/include No
modules/include No
modules/remote_bitrate_estimator/include No
modules/rtp_rtcp/include No
modules/rtp_rtcp/source No
modules/utility/include No
modules/video_coding/codecs/h264/include No
modules/video_coding/codecs/i420/include No
modules/video_coding/codecs/vp8/include No
modules/video_coding/codecs/vp9/include No
modules/video_coding/include No
pc No
rtc_base No
system_wrappers/include No

While the files, types, functions, macros, build targets, etc. in the API and legacy API directories will sometimes undergo incompatible changes, such changes will be announced in advance to [email protected], and a migration path will be provided.

In the directories not listed in the tables above, incompatible changes may happen at any time, and are not announced.

The legacy API directories contain some things you shouldn’t use

The legacy API directories, in addition to things that genuinely should be part of the API, also contain things that should not be part of the API. We are in the process of moving the good stuff to the api directory tree, and will remove directories from the legacy list once they no longer contain anything that should be in the API.

In other words, if you find things in the legacy API directories that don’t seem like they belong in the WebRTC native API, don’t grow too attached to them.

All these worlds are yours—except Europa

In the API headers, or in files included by the API headers, there are types, functions, namespaces, etc. that have impl or internal in their names (in various styles, such as CamelCaseImpl, snake_case_impl). They are not part of the API, and may change incompatibly at any time; do not use them.

Preprocessor macros

The following preprocessor macros are read (but never set) by WebRTC; they allow you to enable or disable parts of WebRTC at compile time.

Be sure to set them the same way in all translation units that include WebRTC code.

WEBRTC_EXCLUDE_BUILT_IN_SSL_ROOT_CERTS

If you want to ship your own set of SSL certificates and inject them into WebRTC PeerConnections, you will probably want to avoid to compile and ship WebRTC's default set of SSL certificates.

You can achieve this by defining the preprocessor macro WEBRTC_EXCLUDE_BUILT_IN_SSL_ROOT_CERTS. If you use GN, you can just set the GN argument rtc_builtin_ssl_root_certificates to false and GN will define the macro for you.