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 >

1 0

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

1 0

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

1 0

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

4 3

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

9 9

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?

1 0

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?

2 1

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

1 0

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). __________________________________________________________

2 1

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

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

mad-user February 2002