Pcsx2: EyeToy Play(1-3) - the video sent by the USB plugin isn't shown

[Florin9doi]

PCSX2 version:

• v1.7.0-dev-60-g802318399

PCSX2 options:

• default

Plugins used:

• USBqemu-wheel-0.10.0 : https://github.com/jackun/USBqemu-wheel/releases/

Description of the issue:
The attached plugin emulates an EyeToy. The following games works:

Bob the Builder
Clumsy Shumsy
EyeToy - Kinetic
EyeToy - Kinetic Combat
Nickelodeon SpongeBob SquarePants - Movin' with Friends
Sega Superstars

but EyeToyPlay(1-3) doesn't. Observation which may be or not related : PCSX2 shows IPU1 running when IPU1 DMA disabled! CHCR 1 QWC 126.

How to reproduce the issue:

• Install USBqemu-wheel-0.10.0, configure it to emulate an EyeToy and load EyeToyPlay(1)

[Florin9doi]

Nobody? 😞 The EyeToy plugin is ready

[prafullpcsx2]

That IPU error is common on many games and so far no solution has been found.

[MrCK1]

If there are no on-screen artifacts with the error, then this can be closed. As prafull said, it's very common to see.

[Florin9doi]

artifacts? the decoder fails on the spot

[Florin9doi]

the ticket was updated to reflect the progress

[seta-san]

@turtleli i understand that you are an IPU master. would you mind taking a look at this?

[turtleli]

I'm not an IPU master. I know almost nothing about it.

[seta-san]

I'm not an IPU master. I know almost nothing about it.

damn. RedDevilus lied to me.

[RedDevilus]

damn. RedDevilus lied to me.

_Isnt IPU more turtleli stuff?_ what i said
I wasn't sure, if you look at IPU.cpp then turtleli has worked on it

[Florin9doi]

@seta-san had the idea to patch EyeToy1 to use ipu_decompressRGB instead of ipu_decompressYCrCb and the game finally displays something :

Serial = SCES-51513
[patches = C0FCD1CE]
    // replace decompressYCrCb with decompressRGB
    patch=0,EE,0015cc80,word,16620033
[/patches]

The color issue is expected considering that it uses an incorrect function to decode the frames.
My observations are that:

1. "IPU1 running when IPU1 DMA disabled" isn't observed while the patch is applied.
2. ipu_decompressRGB function is 3 times shorter than ipu_decompressYCrCb : 0x1A8 bytes vs 0x4F4 bytes
3. ipu_decompressRGB contains a single sceIpuSync call, but ipu_decompressYCrCb contains 6 sceIpuSync calls
4. GameIndex.dbf contains a few sceIpuSync patches; sceIpuSync isn't properly emulated??

The idea is that ipu_decompressRGB is shorter and it works, unfortunately we need ipu_decompressYCrCb which is more complex and it fails: