Remove High Frequency Distortion and Prevent Crackling in All Cases

[Sam-Belliveau]

This PR now includes the changes from #12775 for the graphs

This can help stuff like this from happening in the future :)

Changes:

• Allow Performance Trackers to Custom Time data (time without sleeps + audio latency)
• Improve Max Speed counter (result of previous change
• Add Audio Latency graph to track how many buffers are unplayed by dolphin
• Replace linear interpolation with Sinc filter (removes high frequency distortion)
• Greatly improve algorithm for keeping audio in sync with video (more consistent + less distortion)
• Port previous algorithm to Audio Stretcher so that it is much more consistent
• Play audio backwards when no samples remain in order to prevent crackling
• Default Timing Variance is now set to 10ms

For some reason, Dolphin was using Linear interpolation for converting audio from 32000hz to 48000hz, this leads to extreme aliasing. The way you can tell there is aliasing is by looking at the high frequencies. In a good resampler, there should be no frequencies above the nyquist frequency (16000hz). Look at the spectrograms provided below, they show a clear improvement with the new resampler.

Before (noise at the top is high frequency distortion):

After:

[Avasam]

Audio is noticeably much worst with this PR. Lots of crackling and seems louder.

https://youtu.be/dvQI-K5yUYU

[Sam-Belliveau]

Audio is noticeably much worst with this PR. Lots of crackling and seems louder.

https://youtu.be/dvQI-K5yUYU

This is a bug with the Audio Stretching, turn it off and you'll notice a big improvement. I will attempt to fix later.

[Avasam]

Tested this PR again today.
With audio stretching:

• A few stutters after fast-forward, which is much better than before
• Audio doesn't pitch-shift, but skips when forwarding. Which is better than master's crackly audio when fast-forwarding.

W/o audio stretching:

• Seamless audio transition when forwarding. Kinda sounds like a DJ table.
• Audio pitch-shifts, which can sound very aggressive on 500%+ speed, but may be desirable. No crackly audio like there is on master.

Audio pitch aside, which is probably a subjective preference, this seems an improvement on all sides (I'll personally keep audio stretching on to avoid the pitch shift)

[dreamsyntax]

This is a bug with the Audio Stretching, turn it off and you'll notice a big improvement. I will attempt to fix later.

Is this ready for another test (audio stretcher)?

[Sam-Belliveau]

This is a bug with the Audio Stretching, turn it off and you'll notice a big improvement. I will attempt to fix later.

Is this ready for another test (audio stretcher)?

@dreamsyntax Yes I fixed the issue with the audio stretcher. Basically the amount of available samples that were actually available was being reported incorrectly, but that was fixed awhile ago.