LSP player conversion to Atari Jaguar

[+CyranoJ]

3 minutes ago, 42bs said:

Would be nice, if you'd split player and demo code. Makes it easier to use in another project.

 

I've split the previous version in RAPTOR as an object file.  I will be updating the API with this version.

[Ericde45]

22 minutes ago, 42bs said:

The 5k RAM available is really free? Or just no code, but buffers?

they are free

and that can be a little bit more, as some variables are now only living in registers

 

i don't see the point to fill buffers to play samples.

may be i missed something ?

[Ericde45]

19 minutes ago, CyranoJ said:

 

I've split the previous version in RAPTOR as an object file.  I will be updating the API with this version.

please note : version lspv15.s is module replay only, no sound effects. ( only 4 channels/voices )

Edited September 15, 2022 by Ericde45

[42bs]

2 hours ago, Ericde45 said:

they are free

and that can be a little bit more, as some variables are now only living in registers

 

i don't see the point to fill buffers to play samples.

may be i missed something ?

I thought, there is maybe a buffer for the mixing. But TBH I did not dive into the sources (yet).

[Ericde45]

no buffer, just a long word, 4 bytes, stored in an alternate register, for each voice, to keep 4 bytes of sample

I2S does the mixing in realtime.

 

filling a buffer, even located in DSP RAM, involves writing the buffer, and reading it again in I2S interrupt.

 

[42bs]

8 minutes ago, Ericde45 said:

filling a buffer, even located in DSP RAM, involves writing the buffer, and reading it again in I2S interrupt.

Just guessing, if the mixing is quicker than the replay, wouldn't a double buffering (like it would be done with DMA) help save cycles?

Hmm, maybe not as we have no sound DMA 😞 but it would prevent jitter effect if sometimes mixing takes to long.

Edited September 15, 2022 by 42bs

[Ericde45]

i think a buffer would be better if mixing the 4 channels involves reading management values ( volume, frequency, sample location, sample length) from memory because there is not enough registers to hold them all the time.

might be useful either to use DSP for other tasks that need free registers, or to mix more than 4 voices

and 2 buffers of course

[omf]

where would one get the lspconvert program that works for the jaguar implementation? the one found here https://github.com/arnaud-carre/LSPlayer

does not seem to work (well for the few modules i have tried anyway) and the jag implementation git hub page does not include the convert program as all

 

i was using lspconvert <module>.mod with no optional switches

 

[+CyranoJ]

lspconvert <modname>.MOD -noinsane works.

[Zerosquare]

1 minute ago, CyranoJ said:

-noinsane

A very important option that should always be used when developing stuff for the Jaguar.

[omf]

7 minutes ago, CyranoJ said:

lspconvert <modname>.MOD -noinsane works.

Light Speed Player Converter v1.11
Fastest & Smallest AMIGA music player ever!
Written by Leonard/Oxygene (@leonard_coder)

Unknown option "-noinsane"
Usage:
        LSPConvert <mod file> [-options]

options:
        -v : verbose
        -insane : Generate insane mode fast replayer source code
        -getpos : Enable LSP_MusicGetPos function use
        -setpos : Enable LSP_MusicSetPos function use
        -nosampleoptim : preserve orginal .MOD soundbank layout
        -amigapreview : generate a wav from LSP data (output simulated LSP Amiga player)
        -nosettempo : remove $Fxx>$20 SetTempo support (for very old .mods compatiblity)

 

[+CyranoJ]

 

I've aded LSPConvert to the JS release post.

[Ericde45]

i've added the lspconvert v 1.05, as i did the conversion while this version was the last one

 

https://github.com/ericde45/JAG__LSP_8_channels

 

( by the way, 8 channels replay here )