This reverts commit 9da3e177fd5c2236cc15fea0ee8933e1dd0d8f6d.
Reason for revert: bug in ComputePitchPeriod48kHz()
Original change's description:
> RNN VAD: pitch search optimizations (part 1)
>
> TL;DR this CL improves efficiency and includes several code
> readability improvements mainly triggered by the comments to
> patch set #10.
>
> Highlights:
> - Split `FindBestPitchPeriods()` into 12 and 24 kHz versions
> to hard-code the input size and simplify the 24 kHz version
> - Loop in `ComputePitchPeriod48kHz()` (new name for
> `RefinePitchPeriod48kHz()`) removed since the lags for which
> we need to compute the auto correlation are a few
> - `ComputePitchGainThreshold()` was only used in unit tests; it's been
> moved into the anon ns and the test removed
>
> This CL makes `ComputePitchPeriod48kHz()` is about 10% faster (measured
> with https://webrtc-review.googlesource.com/c/src/+/191320/4/modules/audio_processing/agc2/rnn_vad/pitch_search_internal_unittest.cc).
> The realtime factor has improved by about +14%.
>
> Benchmarked as follows:
> ```
> out/release/modules_unittests \
> --gtest_filter=*RnnVadTest.DISABLED_RnnVadPerformance* \
> --gtest_also_run_disabled_tests --logs
> ```
>
> Results:
>
> | baseline | this CL
> ------+----------------------+------------------------
> run 1 | 24.0231 +/- 0.591016 | 23.568 +/- 0.990788
> | 370.06x | 377.207x
> ------+----------------------+------------------------
> run 2 | 24.0485 +/- 0.957498 | 23.3714 +/- 0.857523
> | 369.67x | 380.379x
> ------+----------------------+------------------------
> run 2 | 25.4091 +/- 2.6123 | 23.709 +/- 1.04477
> | 349.875x | 374.963x
>
> Bug: webrtc:10480
> Change-Id: I9a3e9164b2442114b928de506c92a547c273882f
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/191320
> Reviewed-by: Per Åhgren <peah@webrtc.org>
> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#32568}
TBR=alessiob@webrtc.org,peah@webrtc.org
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:10480
Change-Id: I2a91f4f29566f872a7dfa220b31c6c625ed075db
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/192660
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32581}
1b6b958a4a