Libretro is a bit simpler but similar, and more like DirectSound on Windows:

Ultimately, NativeMix() is called with dynamic sizes at a rate within PPSSPP code's control.

If we got less frames than WASAPI wanted, we fill the rest with padding.

WASAPI tells us how much data it still has, we just grab enough to refill its buffer.

Platform glue has dedicated thread that waits for a few milliseconds, and sends new data to WASAPI periodically.If that works well, it really points to a problem in how data is being sent through on SDL and Qt. To confirm this, it might be worth trying PPSSPP in WINE. It's possible this is an issue only with SDL and Qt. An underrun would mean the opposite - that the emulation wasn't keeping up, and couldn't produce enough audio to keep the buffer moving. So it means that the platform glue or OS was not taking enough data fast enough. This is why it's 8192 - it should not normally use that much buffer unless you have audio latency somewhere in your setup.Īn overrun means that the buffer was full. Often a larger buffer is needed to bluetooth or wireless audio, because it can't stream audio quite as immediately. The platform glue (this part differs on SDL, Qt, retroarch, Windows, Android, iOS, etc.) pulls this data off the buffer whenever it is ready to play more audio, and sends it to the OS.PPSSPP resamples this (if necessary) to keep it smooth, and keeps it in a buffer - that's the 8192 number.The PSP game produces audio data in small bursts, and sends this to PPSSPP's audio system.

Is the sample rate constant at 44100 or does it fluctuate slightly within +/- 10? Are you often seeing audio buffer above 2000 or is it usually below 2000 and sometimes jumping above 2000?Īn overrun would mean audio buffer went up to 8192/8192. What hardware, operating system, and PPSSPP version? On desktop, GPU matters for graphical issues. What should happen?Īudio should be smooth and not suffer from popping or clicking sounds. One game I have not noticed it in is Guilty Gear XX Accent Core Plus. I can always reproduce it on the title screen for Lunar Silver Star Harmony where the FPS and speed counter is a solid 60 and 100% respectively. I tried going back to v1.0 without finding a good commit. I also tried PR #12602 which did not help. Both OpenGL and Vulkan are affected as well as both the SDL and Qt frontends. I have tried most settings and the only one that seems to make any clear impact is disabling Audio sync (resampling) which only helps a little. This is highly distracting and makes it harder to enjoy games. In many (Most?) games I experience often frequent minor audio popping and clicking sounds.

Retroarch ppsspp unreadable menu