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patpsp · Joined: 25 Oct 2005 Posts: 31

Very interesting !!

Do you think, it can be easy to use in the future ? For example, simple functions in the pspsdk like at3_init(), at3_play(char * music), at3_stop() ?

I've tried your sample n�2, it works like a charm :)
Just a little bug, when i browse to the music it has detected, some music are shown in 2 lines, and the selection with up and down, doesn't work properly.

Do you have an idea whether this lib can be less CPU demanding than libmad, or perhaps, whether it uses the ME ?

Is at3 format legal ?

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

it does indeed use 0% zero load on main cpu/allegrex
...why?..because libatrac3 uses the ME to handle the
load so this is by far the best remedy for those looking
for background music to add to their games ...and it
works a treat :)

as for creating your own library of at3_play() etc...
that shouldnt be a problem for you at all ...i mean
i wonder what this does

patpsp · Joined: 25 Oct 2005 Posts: 31

I'm not sure whether i understand your answer.
My question was about the the possibility to write a library like libmad, using the libatrac3 stuff, integrated to the pspsdk.
When i look at the moonlight's sample 2, I see that it generates a prx module, which is not easy to implement in another project.

From what i understood, this library would consist on :
(i simplify the functions, I just want to understand whether this could work or not)

patpsp · Joined: 25 Oct 2005 Posts: 31

Sorry, to post again here, but I really think this libatrac3 can really be a must in homebrew devs.

Do someone currently work on the full pspsdk integration of this lib ?

pspwill · Joined: 17 Nov 2005 Posts: 51

do you think we could use the same method of this to play the video off of umd videos?

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

read the source people!
you can easily integrate this into your
own homebrew! ...its all there and there is
already pspatrac3.h in pspsdk !

pspwill: umd videos do use this format for audio
but the video container still needs to be parsed
and so that is not a possibility right now ...but when
more about pmf is learned no problem ;)
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weltall · Joined: 20 Feb 2004 Posts: 310

i did some mods to this:
-Added support to write at3 decoded data
to uncompressed wav
-Added selection between play only and
saving decoded data to wav
-Added a playlist mode
-extended buffer to 12mb

http://weltall.consoleworld.org/PSP/AT3PLAYERMOD02.rar

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

nice playlist mod :)
that is what people should be doing
good work
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moonlight · Joined: 26 Oct 2005 Posts: 567

Some more functions:

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

:)
buggy bug report:
when playing a atrac3 file from video umd
located at this location disc0:/UMD_VIDEO/SND0.AT3
it will playback once then again when user selects to
playback only once then it will stop after playback 2x

thought youd like to know
nice big improvement in source :)
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TyRaNiD · Joined: 18 Jan 2004 Posts: 918

Added the new functions to the sdk.

patpsp · Joined: 25 Oct 2005 Posts: 31

weltall · Joined: 20 Feb 2004 Posts: 310

after this sceAtracGetMaxSample(atracID, &chsize);
you can find sceAtracSetLoopNum(atracID, 1);
replace with sceAtracSetLoopNum(atracID, 0);

and it replay only one time
thanks to dot_blank

moonlight · Joined: 26 Oct 2005 Posts: 567

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

patpsp: what is your question exactly?
what is your error, what do you want to accomplish?

if its just playing back an atrac3 file the source has
obvious atrac3 playback function and buffer setup

you need to help me to help you
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patpsp · Joined: 25 Oct 2005 Posts: 31

Thanks dot_blank to be more comprehensive. I really appreciate this.

My question was about the possibility to make a library like libmad, which handles all needed for reading atrac3.

The goal is to be able to link any homebrew to this library and use simple functions like libmad offers.

I proposed a prototype some posts ago, and just wanted to know whether it could work.

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

main.c of PRX of atrac3 sample has all the
functions that you should need and creating
your own library is a real snap just create your
own lib with functions in source .c files and the
proper prototypes in a similar named header file
then of course include that header file in your source
.c file and then then include header file in your app
...all functions are there all you have to do is extract
them and alter to your liking ....do not extract the
obvious thread stuff like play_thread as that
should be user specific for whichever app you
are working on

...play around with it and youll see creating your own
library is a snap ...if you dont get it by a weeks end
then maybe someone will provide a easy ready made
library ;)
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moonlight · Joined: 26 Oct 2005 Posts: 567

About the perfomance... I've set the processor to only 12/6 Mhz and it's playing fine :)) The search of files is slower, but the play is really good :)

__count · Joined: 23 Mar 2006 Posts: 22

patpsp · Joined: 25 Oct 2005 Posts: 31

dot_blank -> thanks for answer. I'm trying. Do you think i can totally achieve in not using the prx stuff ?

moonlight -> very good news. thanks again for your work.

moonlight · Joined: 26 Oct 2005 Posts: 567

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

streaming would be probably top of my list :)
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Ghoti · Joined: 31 Dec 2005 Posts: 288

Hi,

I had a question: Is atrac3 usable for sound effects? i mean doing mp3 for this is not usable due to the late play response, wav however almost executes directly so that would be good (if there were libraries existing...) so is atrac3 faster then mp3?

greets Ghoti
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zilt · Joined: 21 Feb 2006 Posts: 45 Location: Ontario, Canada

moonlight: Any luck with figuring out atrac3 streaming? I'm adding music/sound support to my 3d world ( www.antimass.org/zilt ) based on your atrac3sample3.zip and the streaming would help free up memory. Thanks,

Zilt
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Kojima · Joined: 26 Jun 2006 Posts: 275

I see that it loads some roms from the flash. Is there any chance of bricking if my program crashes cos of this? (just got my psp so I'm in that 'too scared to run almost anything incase it bricks my psp' phase)

moonlight · Joined: 26 Oct 2005 Posts: 567

Loading modules from the flash won't destroy your psp. It's what the firmware is constantly doing, the modules of the firmware are not loaded by magic.

That's what i call paranoia in its maximum level.

Kojima · Joined: 26 Jun 2006 Posts: 275

I didn't actually know modules were loaded from flash, like I said I just got my psp so it's all new to me.

zilt · Joined: 21 Feb 2006 Posts: 45 Location: Ontario, Canada

Nevermind about the streaming - I've worked around it by adding a separate thread that keeps a double buffer filled ( reduced the internal buffer down to 512k for dual atrac3 streams). I've also found that I can blend 2 concurrent atrac3 samples ( on separate channels ) with almost no drop in 3d framerate.

When I try starting a third atrac stream, I get 0x80630003 from sceAtracSetDataAndGetID() which I'm assuming means no more atrac streams left or something.

I also changed the dual producer/consumer thread pattern into a single thread ( though each atrac stream is it's own thread ). Thanks very much again for the atrac3 sample. I'll be releasing all my client code ( and keeping it in a svn repos ) after the next release.
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moonlight · Joined: 26 Oct 2005 Posts: 567

Sorry, I forgot totally to continue researching the atrac3 library since i was busy with other things.

The last thing i remember was looking to a couple of functions, sceAtracAddStreamData and other that i don't remember now.

I remember also that the addstreamdata was not what i expected. I expected a pointer in its parameters, but all of them were integer.

I hope this can help someone wanting to finish the job.

subbie · Joined: 05 May 2005 Posts: 122

I have a somewhat stupid question.

Can this...

pspSdkLoadStartModule("flash0:/kd/audiocodec.prx", PSP_MEMORY_PARTITION_KERNEL);
pspSdkLoadStartModule("flash0:/kd/libatrac3plus.prx", PSP_MEMORY_PARTITION_USER);

be executed in an app that is in user mode or must I launch it the same way the demo does?

For some reason my code crashes around thies lines and my app is just in user mode.