ADPCM and FM are out of sync when using SPFM to play FMP music

[denjhang]

When I use SPFM to play FMP music, MDPlayer seems to go into a frozen state for a few seconds (no RD icon is displayed) when loading ADPCM, and then starts producing sound. FM and ADPCM are out of sync for the first few seconds, and after about 5 seconds Just completely synchronized.

[denjhang]

https://youtu.be/ldm9BPcm06E Here is a video showing this bug. I used a USB audio collector to input the SPFM sound into the computer.

[kuma4649]

恐らく原因は実音源はADPCMのメモリにデータを転送するのに時間がかかることだと思います。 が、これに対応するにはFMP側に仕掛けを追加する必要があります。 しかしFMPはソースを公開していないのでほぼ無理かと思われます。

[kuma4649]

MDPlayer STBL343 2023/12/28

をお試しください。

[kuma4649]

こちら、効果ありましたか？

[denjhang]

I'll look into it today.

[denjhang]

The latest version synchronizes FM and ADPCM faster. Currently, synchronization can be achieved within 1 second, but the initial 1 second is very chaotic.

[denjhang]

It looks like it caused other bugs, FM tracks playback is now much slower using FM only.

[denjhang]

https://youtu.be/7F6DlOKOMJY Here is the test video.

[kuma4649]

こちらも対策したうえでの現状であるならばこれ以上の改善は難しいですね。 （ちなみに例によって私の環境では発生しません）

ハードウェアが悪いかチェックするとか、他人のPCでも現象がでるかとか試しましたか？ またオーディオデバイスはハードウェアのASIOを使用していますか？ (MDPlayerは実Chipであってもオーディオデバイスの性能が絡んできます)

[denjhang]

I don't use ASIO, I use WaveOUT.

[kuma4649]

できるだけ、AsioOutか、無理ならWasapiOutを選択してください。 WaveOutやDirectSoundは緊急向け又は、おまけでつけています。

[kuma4649]

また、Asio Out以外の場合は、「遅延時間(レンダリングバッファ)」をできるだけ小さくしてください。 (但し小さすぎると音切れを起こしたりハングアップしたりします)

[kuma4649]

こちらどうなりましたか

[denjhang]

STBL347 still has this problem, and the FM part playback speed is 2 times the PCM speed, which is very inconsistent. The video first shows the sound played using SPFM (abnormality). Then I used the emulation core to play OZI (normally). https://youtu.be/BH-kndG0J_A

By the way, there is no such problem in the STBL345 version. At that time, there was just a delay in ADPCM and it would automatically return to normal after a few seconds. The STBL347 version can't even hear the ADPCM sound because the playback speed is too fast.

[kuma4649]

ここのチェックマークを消してみて試してもらえますか。

あと、AsioOutか、無理ならWasapiOutを選択してください。

[denjhang]

I hope the code related to OZI falls back to STBL345, which is acceptable.

[kuma4649]

FMP関連のコードに大きな違いは無いです

[kuma4649]

参考用に私の設定を。

[denjhang]

In the STBL345 version, no matter which audio output I choose, there is no big problem, and the out-of-sync phenomenon only occurs in the first two seconds. But STBL347 is in a similar situation no matter which setting is selected. I don't have hardware USB ASIO, can you test the output using wasapi or a few other options?

[kuma4649]

Wasapiでも問題なく演奏できてます。 これ、チェックオフしましたか？

[denjhang]

In the STBL345 version, ADPCM syncs fine with your setup.

[denjhang]

In the STBL347 version, ADPCM syncs fine with your setup.

[kuma4649]

これ、チェックオフしましたか？

[denjhang]

Yes, that's how it was set up, and now it's completely normal, it's amazing.

[kuma4649]

Yes！ 正しく演奏されますか？

[denjhang]

yes

[kuma4649]

ではクローズします

[denjhang]

So I want MDPlayer to adapt to SPFM-Y8950, Y8950 and YM2608 are very similar, in rebirth hardware, they use the same DRAM.