RNN VAD: pitch search optimizations (part 3)

`ComputeSlidingFrameSquareEnergies()` which computes the energy of a
sliding 20 ms frame in the pitch buffer has been switched from backward
to forward.

The benchmark has shown a slight improvement (about +6x).

This change is not bit exact but all the tolerance tests still pass
except for one single case in `RnnVadTest,PitchSearchWithinTolerance`
for which the tolerance has been slightly increased. Note that the pitch
estimation is still bit-exact.

Benchmarked as follows:
```
out/release/modules_unittests \
  --gtest_filter=*RnnVadTest.DISABLED_RnnVadPerformance* \
  --gtest_also_run_disabled_tests --logs
```

Results:

      | baseline             | this CL
------+----------------------+------------------------
run 1 | 22.8319 +/- 1.46554  | 22.087 +/- 0.552932
      | 389.367x             | 402.499x
------+----------------------+------------------------
run 2 | 22.4286 +/- 0.726449 | 22.216 +/- 0.916222
      | 396.369x             | 400.162x
------+----------------------+------------------------
run 2 | 22.5688 +/- 0.831341 | 22.4902 +/- 1.04881
      | 393.906x             | 395.283x

Bug: webrtc:10480
Change-Id: I1fd54077a32e25e46196c8e18f003cd0ffd503e1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/191703
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32572}
5 files changed
tree: 2fae3e7af16072d414ab25625743c9faebe69eda
  1. api/
  2. audio/
  3. build_overrides/
  4. call/
  5. common_audio/
  6. common_video/
  7. data/
  8. docs/
  9. examples/
  10. logging/
  11. media/
  12. modules/
  13. p2p/
  14. pc/
  15. resources/
  16. rtc_base/
  17. rtc_tools/
  18. sdk/
  19. stats/
  20. style-guide/
  21. system_wrappers/
  22. test/
  23. tools_webrtc/
  24. video/
  25. .clang-format
  26. .git-blame-ignore-revs
  27. .gitignore
  28. .gn
  29. .vpython
  30. abseil-in-webrtc.md
  31. AUTHORS
  32. BUILD.gn
  33. CODE_OF_CONDUCT.md
  34. codereview.settings
  35. DEPS
  36. ENG_REVIEW_OWNERS
  37. LICENSE
  38. license_template.txt
  39. native-api.md
  40. OWNERS
  41. PATENTS
  42. PRESUBMIT.py
  43. presubmit_test.py
  44. presubmit_test_mocks.py
  45. pylintrc
  46. README.chromium
  47. README.md
  48. style-guide.md
  49. WATCHLISTS
  50. webrtc.gni
  51. webrtc_lib_link_test.cc
  52. whitespace.txt
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 here for instructions on how to get started developing with the native code.

Authoritative list of directories that contain the native API header files.

More info