mad-dev December 2000

mad-dev@lists.mars.org

7 participants
9 discussions

IMDCT MLA patch
by Rob Leslie 03 Jan '01

03 Jan '01

FWIW, here's a patch to use the multiply/accumulate macros in the Layer III IMDCT. Dan, if you want, you can just write something in fixed.h to define these macros for the PowerPC. Cheers, -rob

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Re: [mad-dev] madplay on embedded PowerPC
by Andre 28 Dec '00

28 Dec '00

--- Dan Malek <dan(a)mvista.com> wrote: > So, my idea was to modify imdct36 so the mad_f_mul + mad_f_mul .... > sequences were replaced by 64-bit multiply/accumulates, then you > just round/scale once at the end (like I would do on a DSP). This > improved the performance by about 6%, and I ended up with great > compiler generated code. For example: > > t6 = > mad_f_mul(X[4], 0x0ec835e8L) + > mad_f_mul(X[13], 0x061f78aaL); > > becomes: > > macreg = 0; > mad_f_mac(macreg, X[4], 0x0ec835e8L); > mad_f_mac(macreg, X[13], 0x061f78aaL); > t6 = mad_f_macscale(macreg); Cool. There are actually macros to support this already - I did basically the same thing for imdct_s() in the patch I posted a link to previously. It's also in the ARM assembler imdct_l() function, but for some reason hasn't made it back into the C version yet (although I'm sure was on the TODO list at one stage ??). > I guess I need to run some official bit streams, but it sounds OK. > This could certainly be the PowerPC optimization. I'll send a > patch to someone if they would like to see it. Straight to the list is good - I guess the patch won't be huge. Final say on if/when/inwhatform it gets rolled into the main code is down to Rob though. Andre -- ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie

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Re: [mad-dev] madplay on embedded PowerPC
by Andre 28 Dec '00

28 Dec '00

--- Dan Malek <dan(a)mvista.com> wrote: > > > Well, I'm impressed........ > > I expected to do some serious profiling and assembler writing, > but all I did was configure and make. It runs on my wimply 50 MHz > embedded MPC860 PowerPC, uses about 80% of the CPU, NFS root file > system. It's an Embedded Planet board with a Crystal CS4218 codec > running Linux. I'm using mad-0.2.12b. > > Pretty nice. Now I have to find another holiday week project :-). If you are still looking for an assembler project, MAD could probably use a PowerPC assembler version of the imdct function to match the ARM version I wrote, or maybe an assembler version of the synthesis functions which I don't think anyone has had a go at yet. There is also still some C optimisation to do if you are up to the challenge :-) see Rob's TODO list. Andre -- ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie

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Re: [mad-dev] madplay on embedded PowerPC
by Andre 27 Dec '00

27 Dec '00

--- Dan Malek <dan(a)mvista.com> wrote: > Rob Leslie wrote: > > > .... Probably > > you're using the FPM_APPROX version now, > > Yes, that is what I was using. Unfortunately, the FPM_64BIT blows > my CPU budget on the baby processor, but it is close. I can crank > up the PLL and probably get a little more with some profiling. If the PPC has a 32x32=64bit multiply instruction, then FPM_64BIT shouldn't be much slower (if at all) then FPM_APPROX. Make sure you configure with --enable-speed and --disable-debugging though. If you are still right on the limit, you might want to try some C optimisations I did a while back: ftp://ftp.mars.org/pub/mpeg/contrib/opt3-0.12.2b.patch.gz which might be a better solution than tweaking the PLL. > I'll keep you posted on any improvements I make. > > Thanks for the great starting point! Have fun :-) Andre -- ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie

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madplay on embedded PowerPC
by Dan Malek 26 Dec '00

26 Dec '00

Well, I'm impressed........ I expected to do some serious profiling and assembler writing, but all I did was configure and make. It runs on my wimply 50 MHz embedded MPC860 PowerPC, uses about 80% of the CPU, NFS root file system. It's an Embedded Planet board with a Crystal CS4218 codec running Linux. I'm using mad-0.2.12b. Pretty nice. Now I have to find another holiday week project :-). Thanks. -- Dan -- I like MMUs because I don't have a real life.

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simple question
by Gabriel Bouvigne 21 Dec '00

21 Dec '00

I was wondering where the left_err and right_err used for dithering are computed? Regards -- Gabriel Bouvigne - France bouvigne(a)mp3-tech.org mobile phone: gsm(a)mp3-tech.org icq: 12138873 MP3' Tech: www.mp3-tech.org personal page: gabriel.mp3-tech.org

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Fwd: [mad-dev] Re: [mad-user] MAD DLL
by ROBERTJPL＠aol.com 11 Dec '00

11 Dec '00

Hello , I keep getting many e-mails to MY e-mail address that you are supposed to be getting..

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Re: [mad-dev] Re: [mad-user] MAD DLL
by Kalani Sanders 11 Dec '00

11 Dec '00

That's going to take me longer. I'm having some problems getting everything in madplay to compile properly. Until then, you should be able to compile it under cygwin, I think. cheers Kalani Sanders "Clint Kennedy" <djslakor(a)hotmail.com> wrote: > Kalani, > > could you possibly build a project for compiling madplay also? I like to > listen to current builds and Rob has added no instructions for win32 > compilation! :-) > > thanks!

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Re: [mad-user] MAD DLL
by Kalani Sanders 11 Dec '00

11 Dec '00

I'm putting the finishing touches on a VC++ project to compile the winamp plugin, I'll see what I can do about adding a project for just the library. cheers Kalani Sanders "FunkyMan" <FunkyMan(a)myself.com> wrote: > I wanted to use the MAD decoder in my MP3 Player, but as a matter of facts, > i wasn't able to compile it under windows :-( > > has anyone build a DLL that can be used by a windows program (a kind of > LIBMAD.DLL), or anyone made a VC++ project to compile MAD under windows ?

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mad-dev December 2000