Re: [Csnd-dev] [EXTERNAL] [Csnd-dev] sysdep.h and MAXLEN for ftables

Yes I'm using a M3 mac (ARM based) so that's why it's failing. I still have
to try it on Csound7.
2^31 looks like a big improvement, it's 811 minutes for a mono source at
44100Hz, correct?
So if it's possible let's go for it!


Il giorno mer 2 ott 2024 alle ore 07:43 vlz <[email protected]> ha
scritto:

> For multichannel, you can use one table per channel instead of interleaved
> and there's no loss in length.
>
> It looks like 2^31 is possible without having to edit the full codebase.
>
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
>
> > On 2 Oct 2024, at 01:14, joachim heintz <[email protected]> wrote:
> >
> > but what giovanni mentioned as multi-channel import should be
> considered.  if we import interleaved, we can hit the limit more easy. so
> if it is safe to extend to 2^32 as maximum length, it might be good.
> >
> >> On 02/10/2024 00:46, Victor Lazzarini wrote:
> >> I figured it out:
> >> 1) Starting with 6.18.1 on Mac I released universal binaries
> >> 2) The check for B64BIT was only picking up the x86_64 nor arm64
> >> The result was that for  i1 ftgen 1, 0, 2^28, 2, 0, 2^28, 0
> >> 1) on arm64 (Csound 6.18.1)
> >> /usr/local/bin/csound test.csd -n
> >> INIT ERROR in instr 0 (opcode ftgen) line 8: ftgen error
> >>  from file test.csd (1),i1 ftgen 1 0 268435456 2 0 268435456 0
> >> 2) on x86_64 (Csound 6.18.1)
> >> arch -x86_64 /usr/local/bin/csound test.csd -n
> >> ftable 1: 268435456 points, scalemax 1.000
> >> So for 6.18.1, only the x86_64 allows up to 2^28-length tables.
> >> With Steven’s fix, Csound 7 is building with B64BIT on arm64. But I
> think this changes does not need to be limited to 64bit platforms.
> >> We probably can roll it out to all platforms.
> >>>> On 1 Oct 2024, at 23:12, vlz <[email protected]> wrote:
> >>>
> >>> I think the check was broken, Steven seems to have fixed it.
> >>>
> >>>> On 1 Oct 2024, at 23:06, vlz <[email protected]> wrote:
> >>>>
> >>>> Then for some reason in the build B64BIT is not defined. If that’s
> defined you can do
> >>>>
> >>>> i1 ftgen 1, 0, 2^28, 2, 0, 2^28, 0
> >>>>
> >>>> We need to check that.
> >>>>
> >>>>> On 1 Oct 2024, at 22:47, Giovanni Bedetti <
> [email protected]> wrote:
> >>>>>
> >>>>> I tried to create a table (using the API, compileOrc and
> CopyTableIn) after reading samples from a stereo file (so the table will
> hold both channels, interleaved): this works: audioClip samples 4549938x2 =
> 9099876, length (seconds): 103.1732, sr: 44100
> >>>>> this doesn't: audioClip samples 10612538x2 = 21225076, length
> (seconds): 240.6471, sr: 44100
> >>>>> with this log:
> >>>>> illegal table length
> >>>>> INIT ERROR in instr 0 (opcode ftgen) line 11: ftgen error
> gisampletable100 ftgen 100 0 -21225076 -7 0 0
> >>>>>
> >>>>> I'm still using Csound6 (6.18) on CsoundUnity on macOS
> >>>>>
> >>>>> Il giorno mar 1 ott 2024 alle ore 21:58 Victor Lazzarini <
> [email protected]> ha scritto:
> >>>>> That’s if B64BIT is not defined. Actually I don’t think we need to
> check for this.
> >>>>> ========================
> >>>>> Prof. Victor Lazzarini
> >>>>> Maynooth University
> >>>>> Ireland
> >>>>>
> >>>>>> On 1 Oct 2024, at 20:20, Steven Yi <[email protected]> wrote:
> >>>>>>
> >>>>>> I was going off what's documented in the manual (
> https://csound.com/docs/manual/f.html)
> >>>>>>
> >>>>>> "p3 -- Size of function table (i.e. number of points) Must be a
> power of 2, or a power-of-2 plus 1 if this number is positive. Maximum
> table size is 16777216 (224) points."
> >>>>>>
> >>>>>> I think Giovanni ran into issues with longer sized tables but I
> don't recall how long.
> >>>>>>
> >>>>>> On Tue, Oct 1, 2024 at 3:00 PM Victor Lazzarini <
> [email protected]> wrote:
> >>>>>> MAXLEN is 0x10000000 for most modern archs, that's 2^28 is it not?
> That translates into
> >>>>>> about 101 minutes of audio at 44100.
> >>>>>>
> >>>>>> It does not strike me as too short. I think we could get away with
> 2^32 without having to do a major overhaul, but I need to check if my idea
> works correctly. That would allows 1603 minutes or 27 hours of audio.
> >>>>>>
> >>>>>> Prof. Victor Lazzarini
> >>>>>> Maynooth University
> >>>>>> Ireland
> >>>>>>
> >>>>>>> On 1 Oct 2024, at 13:36, Steven Yi <[email protected]> wrote:
> >>>>>>>
> >>>>>>>  *Warning*
> >>>>>>> This email originated from outside of Maynooth University's Mail
> System. Do not reply, click links or open attachments unless you recognise
> the sender and know the content is safe.
> >>>>>>> Hi All,
> >>>>>>>
> >>>>>>> I was chatting with Giovanni Bedetti on Discord about max table
> length. It seems awfully small at 2^24 (~16MB). Any reason not to bump that
> up to something larger?
> >>>>>>>
> >>>>>>> Also, while looking at that, I noticed B64BIT detection in
> sysdep.h. I saw that it was missing aarch64 amongst other things, so I've
> submitted a PR to update this.
> >>>>>>>
> >>>>>>> steven
> >> ========================
> >> Prof. Victor Lazzarini
> >> Maynooth University
> >> Ireland
>