Reimplement the builtin audio codec factories using the new stuff in api/

The whole point of all the audio codec stuff we've recently published
in api/ is to function as lego bricks so that building stuff like our
builtin audio codec factories will be easy.

(This has landed once before, but got reverted because of Chromium test
failures---apparently, someone isn't ignoring the case of the codec names
like they're supposed to. The quick fix was to preserve the same case
used by the old implementation.)

BUG=webrtc:7821, webrtc:7822

Review-Url: https://codereview.webrtc.org/2998263002
Cr-Commit-Position: refs/heads/master@{#19512}
15 files changed
tree: fcd4d4c612aa7d168643c7f5fb707e2600e006d5
  1. build_overrides/
  2. data/
  3. infra/
  4. resources/
  5. tools_webrtc/
  6. webrtc/
  7. .clang-format
  8. .git-blame-ignore-revs
  9. .gitignore
  10. .gn
  11. AUTHORS
  12. BUILD.gn
  13. CODE_OF_CONDUCT.md
  14. codereview.settings
  15. DEPS
  16. LICENSE
  17. license_template.txt
  18. LICENSE_THIRD_PARTY
  19. OWNERS
  20. PATENTS
  21. PRESUBMIT.py
  22. pylintrc
  23. README.md
  24. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info