mad-user February 2002

mad-user@lists.mars.org

23 participants
20 discussions

Re: [mad-user] MP3 sampled by 22.05kHz, mono or stero
by weipyy 28 Feb '02

28 Feb '02

> Dear davidlee: You can resample the mp3 form 44.1khz to 22.05khz by mad BRs wei ping > > > > > > > Dear All: > Because I should do same test, I need some > MP3s with 22.05kHz sample frequency stero or mono. But after I got some MP3s, I > found all of them are sampled by 44.1kHz, that's to fast for my poor MP3 > hardware. So I wander if anyone can tell where I can find MP3 sample by 22.05Khz > 16bit mono or stero. I appreciate anyone's help > > > > > > BEST REGARD > > > > > davidlee > > ÀîŽóŒœ > > Email: davidlee(a)gv.com.tw >

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Re: [mad-user] madplay control
by Rob Leslie 26 Feb '02

26 Feb '02

On Tuesday, February 26, 2002, at 01:13 AM, Nicolas DEVERGE wrote: > I'm a newbie using mad and I wish to control madplay through its stdin, > let's > say, I wish to pause, resume or quit madplay by sending a P, Q or else > character in its standard input with another program (maybe through a > socket), so is it possible with madplay ? And how works the tty-control > parameter ? madplay reads keyboard input from its controlling terminal, so to make this work you would need to mess with master and slave PTYs, or use a tool like `expect'. An alternative would be to send signals to the madplay process: SIGSTOP would pause, SIGCONT would resume, and SIGINT would quit. -- Rob Leslie rob(a)mars.org

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madplay control
by Nicolas DEVERGE 26 Feb '02

26 Feb '02

Hi, I'm a newbie using mad and I wish to control madplay through its stdin, let's say, I wish to pause, resume or quit madplay by sending a P, Q or else character in its standard input with another program (maybe through a socket), so is it possible with madplay ? And how works the tty-control parameter ? Thanks, Nico

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alternative idct implementation question
by Yuxuan Mao 25 Feb '02

25 Feb '02

Hi, I'm doing a school project on mp3 decoders. Other teams in my class is proposing to do an 8-bit cosine lookup table implementation of the idct. Does anyone know if this will work? Yuxuan

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Huuuuuuuge Improvement to My Stereo
by John van Ommen 22 Feb '02

22 Feb '02

If any of you do a lot of listening at your PC, I ran into something today that may be of interest. I've been listening to MP3s on the command line using madplay.exe, cuz winamp sounded like ass, even with the MAD plugin. It turns out that a upgrade of wimamp had replaced my "wave out" output plugin in Winamp. As far as I can tell, the MAD input pluging was outputting a 24bit stream, and I think the wave out plugin was truncating it down to 16bit. Nonetheless, I fixed the output plugin, and the difference is h-u-g-e. 24/96 soundcards playing MP3s upsampled to 24/48 really give CDs a run for their money. Especially at high volumes, the extra dynamics of 24bit are clear, and it seems like you can see 'deeper' into the recording as well. John van Ommen

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only mpeg1 layer 3 code
by Yuxuan Mao 22 Feb '02

22 Feb '02

Hi, We're doing a school project on mp3 decoding with a motorola micro-controller and an altera fpga. We're only interested in mpeg1 layer 3 decoding. So we want to trim the MAD distribution down to only the relevant files pertaining to that. But we're kind of lost on that. Can someone help?

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installation help
by Yuxuan Mao 22 Feb '02

22 Feb '02

Hi, We're doing a school project on building a mp3 decoder on a Motorola processor and an Altera FPGA. We'd like to use MAD because it appears to be the only open source integer decoder available on the net. But when we try to install it on our school unix account by typing ./configure, it gives us this error: ./configure: Permission denied. Can someone help us?

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Re: [mad-user] RE: Huuuuuuuge Improvement to My Stereo
by Andrew Burgess 21 Feb '02

21 Feb '02

>With upsampling, you can interpolate that waveform to *approximate* a sine >wave. Obviously, the best solution would be to do the original recording at >a extremely high sampling rate. I don't think this explains it. A 20KHz square wave sounds like a 20KHz sine wave on your stereo. This is because, in the frequency domain, a square wave is the same as a sum of (even or odd -- I forget, probably odd) harmonics. The first harmonic is 40KHz which your stereo cannot reproduce. The 2nd is 80KHz, etc. All DACs also have low pass filters on the output to attenuate these unwanted harmonics. I don't disbelieve that it sounds better but I don't think this explains it. Andrew

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Is there any WINxx SDK for MAD ???
by S.Sekar 17 Feb '02

17 Feb '02

Hi, Is there any WINxx SDK for MAD. Currently I am using XAUDIO and want to s/o to MAD. How to go about it ??? TIA Yours. #407, 'B' Block, Sterling Park, Kodiga Halli, S.Sekar. Sanjeevini Nagar, Bangalore - 560 092. India. __________________________________________________________ E-Mail : sekar(a)vsnl.com (or) ssekar(a)cheerful.com sekar(a)softhome.net (or) ssekar(a)hotmail.com Phone : 91(80)3636804 (R) 91(80)3412700, 3412792 (O). __________________________________________________________

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Problems when porting to MIPS processor using Greenhills compiler
by Jeroen T 15 Feb '02

15 Feb '02

Hi. I got problems using MADLIB with a MIPS4111 processor and the Greenhills compiler. The compiler is doing OK, and also the decoder seems to do something. When I decode a 128 kbits MP3 containing a stereo 440Hz sinus, I get strange results. The output contains sinus wave forms in multiple frequencies and amplitudes, the output samples get even out off boundaries! I use the FPM_DEFAULT to be 100% compatible. When compiling the MADLIB on the PC with FPM_DEFAULT everything is OK. Does anyone has ported the MADLIB to a MIPS succesfully? With which compiler? Or maybe someone has a suggestion which (free) compiler running on DOS/Windows I can use to compile the MADLIB? Hope someone can help me out. Thanks. Jeroen _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

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Re: [mad-user] minimad.c
by Gareth 10 Feb '02

10 Feb '02

Thanks, that worked fine. The only thing is minimad seems to do nothing, I tried ./minimad and it just goes straight back to the command prompt. I tried giving it a filename, ./minimad track.mp3, and the same thing happens. Can you give me some pointers as to how i start using it, or is there some basic documentation that i can read up on it? On 10 Feb 2002 11:50:41 -0500, Mathieu Dube wrote: > you need to tell it to use libmad > > so do gcc minimad.c -o minimad -lmad > > -Mat > On Sunday 10 February 2002 07:50, you wrote: > > Hi, > > I have compiled mad-0.13.0b which went off fine but i am interested in > > playing with minimad.c. The problem is i can't see how to compile it. I > > tried 'gcc minimad.c' but it can't find mad.h. How do i tell the compiler > > how to find all the necessary files? I am using mandrake 8.0. > > > > Thanks. >

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Re: [mad-user] Use on Dreamcast/Linux
by Marcus Kwok 10 Feb '02

10 Feb '02

On Sun, Dec 23, 2001 at 11:01:18PM +0000, Adrian McMenamin wrote: > On Sunday 23 Dec 2001 6:57 pm, you wrote: > > On Sun, Dec 23, 2001 at 01:45:07PM +0000, Adrian McMenamin wrote: > > > Anybody know of a test suite of MP3s that I could use to try to isolate > > > the problem? > > > > ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg1/compliance/ > > > > This page has some test patterns that might be helpful. Good luck. > > Thanks for this - but these were still not much good. None played but that > might have been for a number of different reasons. All the layer III examples > appeared to be MPEG 1s - I really need a range of MPEG 2s as well. ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg2/ This has some mpeg 2 test patterns as well. I don't think they were meant to be played, but rather I think they are there to make sure your decoder works properly. Like, you decode the files and compare the output to another decoder that you know works properly. Sorry if this isn't what you were looking for, but I hope it helps. -- Marcus B. Kwok | 338178 Georgia Tech Station | AOL Instant Messenger: SLuGHEAd78 Atlanta, GA 30332 | ICQ: 20039767 http://gtf.org/ricecake/ | ricecake(a)gtf.org

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precision/quality mode - Winamp
by George Pantazopoulos 08 Feb '02

08 Feb '02

Heya Rob, With the popularity of fast CPU's (a 1 GHz Athlon can now be had for $70) , would you please bump the winamp MAD decoder up to full accuracy decoding. Im sure the extra CPU time consumed will be negligible. Also you could consider adding even higher quality and accuracy options now. Thanks, George Pantazopoulos

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streaming audio support - fix?
by George Pantazopoulos 08 Feb '02

08 Feb '02

Heya Rob, Do you happen to have a build of MAD for winamp that works correctly with shoutcast streams? (ie doesnt drop out) The one I have now is 14.2b Thanks, George Pantazopoulos

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ID3 Tags
by Lindsay Berry 07 Feb '02

07 Feb '02

Is anyone else having a problem with MAD reading the ID3 tags on their MP3s or is it just me? Always the song title. Thanks..

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24/48 MP3s
by John van Ommen 07 Feb '02

07 Feb '02

Anyone know why the LINUX port of madplay can't paly 24/48 MP3s, but the Wintel version can? I upsample all my mp3s from 16/44 to 24/48 to take advantage of the wider bandwidth of modern soundcards. John

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Re: [mad-user] 24/48 MP3s
by John van Ommen 07 Feb '02

07 Feb '02

Have you ever HEARD a upsampler? Have you compared a CD upsampled to 24/48? If you haven't, I suggest you keep your (uninformed) opinions to yourself until you learn more about hi-fidelity. John P.S. If you took a VHS signal sampled at 320x240, and interpolated it to 1280x960, it *would* look better. That's exactly what I'm doing with the audio signal. Hearing is believing, if you have a 24/96 sound card, I'll send you the scripts and you can try it yourself. On Wednesday 06 February 2002 10:15 pm, you wrote: > Upsampling doesn't improve your quality at all...you may also lose some > quality depending on the algorithm used. Tell me this...if you put a VHS > video on DVD, is it gonna look like DVD? > > Ishaan > > ----- Original Message ----- > From: "John van Ommen" <jvanommen(a)verio.net> > To: <mad-user(a)lists.mars.org> > Sent: Wednesday, February 06, 2002 4:14 PM > Subject: [mad-user] 24/48 MP3s > > > Anyone know why the LINUX port of madplay can't paly 24/48 MP3s, but the > > Wintel version can? > > > > I upsample all my mp3s from 16/44 to 24/48 to take advantage of the wider > > bandwidth of modern soundcards. > > > > John

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Re: mad-user digest, Vol 1 #102 - 4 msgs
by Dmitry 06 Feb '02

06 Feb '02

Hello mad-user-request, hey, guys! is it possible not to use html in your mails? 1) it's completely impossible to read digest!!! 2) not all mail-readers understand html format PLEASE USE PLAIN TEXT Best regards, Dmitry mail to: kuts(a)jthz.com http://mitiok.cjb.net/

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Frame skipping
by Mathieu Dube 06 Feb '02

06 Feb '02

Hi, is there a way one can skip a frame in a stream instead of doing mad_frame_decode. Coz I need to make a jump ahead but it takes too much time if I just wait for the say 10 seconds to pass without writing to /dev/dsp but still decoding. I dont know if I attacking the problem in a good way thus any suggestions are welcome. -Mat

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Doc
by Mathieu Dube 01 Feb '02

01 Feb '02

Hi, is there some kind of documentation on how to use mad for decoding mp3s or is there only the code and headers(mad.h)? Thanks -Mat

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mad-user February 2002