mad-dev April 2006

mad-dev@lists.mars.org

6 participants
5 discussions

how to play cdr file decoded by madlld
by Gang-Ryung Uh 04 Feb '07

04 Feb '07

We installed madlld and decode sample mp3 file into cdr extension. Could you advise us how to play that cdr file on cygwin with window XP? Thanks, __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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need you help
by lizhan 30 Apr '06

30 Apr '06

Dear Sir/Madam: Recently, I take part in developing a mp3 decoder, and we come across a questios that is: How to test the mp3 LIBMAD decoder compliance with respect to the ISO/IEC 11172 international standard, which are stated in http://www.underbit.com/resources/mpeg/audio/compliance/. To test the decoder compliance, our method are taken as follows: 1. we get a test case (layer 3 test bitstreams), which we got from the web ftp://ftp.fhg.de/pub/layer3/ at Fraunhofer Institut. The case consists of: compl.bit the test bitstream (10Hz-10kHz/-20dB sine sweep) mono, 48 kHz compl.hex reference output in 24bit ascii hex format (mono) These two files are mp3 test bitstreams whice are designed to help verify that an mpeg decoder works properly.These conformance bitstreams are the official test bitstreams provided by the MPEG committee. 2. next we catch the audio output data by decoding the bitstream "compl.bit" with our player. 3. then compare this output with the reference output "compl.hex". However we found the two output are totally different. I wonder if somebody are kindly enough to share us with what is your test method and test case to do the compliance test. Looking forward your response. Best regards! leon email:lizhan@amoi.com.cn

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MAD/ARM archeology..
by john cooper 14 Apr '06

14 Apr '06

Hello, I've been lugging around a 0.13 version of libmad for about 5 years for use in a back burner project. I've ported the works to PPC about a year ago and just today to ARM. With 0.13 libmad there seems to be some really funky decode artifacts in libmad 0.13/ARM (but not in 0.15.1) which I couldn't explain. I noticed a few ARM-specific changes in fixed.h between 0.15.1 and 0.13 as well as what appear to be some tweaks called out in the CHANGES file. But the echo-like decode artifacts were so dramatic I can't believe they would have gone unnoticed nor unaddressed. I suppose it could be some odd build issue local to my work but that seems rather remote. Anyone encounter any similar issue specific to ARM in or around that vintage? Thanks, -john -- john.cooper(a)third-harmonic.com

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VBR headers, and even ID3v2
by Cameron Gorrie 09 Apr '06

09 Apr '06

In a March 2004 post on this list, this little snippet came up: > On Mar 30, 2004, at 2:17 PM, Glenn Maynard wrote: > >>* There's no support for reading Xing/LAME VBR header tags in libmad, > *>>* but > *>>* the code to do it can be found in madplay (see tag.c). > *>* > *>* Note that this code doesn't parse "Info" tags, which are just Xing > *>* tags but are usually written for CBR files (probably to not confuse > *>* players which assume existance a Xing tag means VBR). > * > Actually since version 0.15.1b, it does -- at your suggestion, in fact. > It also reads any LAME tag following the Xing info, which contains > Replay Gain information. > > Now I have version 0.15.1b, but I don't know how to access this data - specifically, the computed length of the file. Also, I read somewhere that support for ID3v2 headers was being built into MAD. Is there any truth in this, or should I be doing it on my own?

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cross-compile libmad for ARM
by waseim mohamed 05 Apr '06

05 Apr '06

i just need help in exact steps to cross compile libmad for arm. and whatoptions should be used when configuring? Thanks in advance.. _________________________________________________________________ On the road to retirement? Check out MSN Life Events for advice on how to get there! http://lifeevents.msn.com/category.aspx?cid=Retirement

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mad-dev April 2006