[Request] VF Sound System Mp3 Decoder

Zilog · 03 January 2019, 13:45

Hi Toni,
i know if use cpu power of winuae, mp3 play normaly, but if i want use a basic emulation 1200 not.

I ask, it possibile implement only mp3 decoder?:
http://*amiga.resource.cx/exp/vfsoundsystem

Thanks a lot.

Toni Wilen · 03 January 2019, 18:18

Hmm.. Does not sound like a good choice, it has PCM audio playback support but does it really have full AHI driver?

There really aren't "good" options because better ones have programmable DSP which I am not going to emulate.. Complete driver support is also requirement, not just some device that looks nice but no one has ever used..

EDIT: Also clock port is stupid interface.
Prisma megamix probably would be good choice but not until full specs are available.

Zilog · 03 January 2019, 20:32

Prisma Megamix are ok, have a mp3 hardware decoder, i dont' see in the amiga.resource.cx.

It possible use in A1200. 2000, A3000, A4000, A4000T....are more universal.

I not search necessarily audio card, but a hardware docoder for mp3 audio on amiga 1200.

Thansk.

Romanujan · 03 January 2019, 23:21

Instead of emulating a real hardware, maybe it's better to emulate a virtual device, like UAEGFX? AFAIK there are two options for the APIs:

- MHI: http://aminet.net/package/mus/play/mhi_dev
- mpeg.device: http://www.katodev.de/katodev/down/melodydev.lha

Zilog · 04 January 2019, 13:06

Quote:

Originally Posted by Romanujan

....

Thanks for info.

Toni Wilen · 04 January 2019, 15:40

Quote:

Originally Posted by Romanujan

Instead of emulating a real hardware, maybe it's better to emulate a virtual device, like UAEGFX?

It has existed few years already but writing driver is painful. For example AHI does not have any good examples for driver that does everything in hardware, full DMA and hardware mixing.

Romanujan · 04 January 2019, 16:10

Not AHI - MHI. This is API strictly for things like MP3 playback.

Toni Wilen · 04 January 2019, 16:15

For mp3 playback I won't make any kind of UAE board. There is already good enough real board to emulate. It is much easier to emulate hardware than write drivers.

I also remember that MHI had some other issues.

Only special case is AHI compatible device that has full DMA, multiple channels and hardware mixing because good enough real hardware does not exist.

03 January 2019, 13:45	#1
Zilog Registered User Join Date: May 2014 Location: Italy Posts: 419	[Request] VF Sound System Mp3 Decoder Hi Toni, i know if use cpu power of winuae, mp3 play normaly, but if i want use a basic emulation 1200 not. I ask, it possibile implement only mp3 decoder?: http://*amiga.resource.cx/exp/vfsoundsystem Thanks a lot.

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03 January 2019, 18:18	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	Hmm.. Does not sound like a good choice, it has PCM audio playback support but does it really have full AHI driver? There really aren't "good" options because better ones have programmable DSP which I am not going to emulate.. Complete driver support is also requirement, not just some device that looks nice but no one has ever used.. EDIT: Also clock port is stupid interface. Prisma megamix probably would be good choice but not until full specs are available.

03 January 2019, 20:32	#3
Zilog Registered User Join Date: May 2014 Location: Italy Posts: 419	Prisma Megamix are ok, have a mp3 hardware decoder, i dont' see in the amiga.resource.cx. It possible use in A1200. 2000, A3000, A4000, A4000T....are more universal. I not search necessarily audio card, but a hardware docoder for mp3 audio on amiga 1200. Thansk.

03 January 2019, 23:21	#4
Romanujan Registered User Join Date: Dec 2007 Location: Szczecin/Poland Posts: 424	Instead of emulating a real hardware, maybe it's better to emulate a virtual device, like UAEGFX? AFAIK there are two options for the APIs: - MHI: http://aminet.net/package/mus/play/mhi_dev - mpeg.device: http://www.katodev.de/katodev/down/melodydev.lha

04 January 2019, 16:10	#7
Romanujan Registered User Join Date: Dec 2007 Location: Szczecin/Poland Posts: 424	Not AHI - MHI. This is API strictly for things like MP3 playback.

04 January 2019, 16:15	#8
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	For mp3 playback I won't make any kind of UAE board. There is already good enough real board to emulate. It is much easier to emulate hardware than write drivers. I also remember that MHI had some other issues. Only special case is AHI compatible device that has full DMA, multiple channels and hardware mixing because good enough real hardware does not exist.

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