mad-dev February 2002

mad-dev@lists.mars.org

15 participants
15 discussions

Re: Problems when porting to MIPS processor using Greenhills compiler
by Jeroen 15 Feb '02

15 Feb '02

Hi! Thanks for your reply. For all other people: I try to decode a 440 Hz Sinus (left & right are the same) MP3 in 128 kbits fixed rate and 44.1 KHz sampling rate. The MP3 decodes fine on a PC in Visual C++. When using a Greenhills compiler for the MIPS4111 processor I get weird output. I only look at the left channel. MAD gives signed 32 bits samples as output. I displayed them on a television for debugging. The MIPS processor is connected to a television. I sent a screenshot of the output with this email. It has nothing to do with endian swap I guess because the data is in shape, but not correct. Take a look for yourself. What's your opinion? Thanks. Jeroen > > ----- Original Message ----- > From: "Andre" <armccurdy(a)yahoo.co.uk> > To: "Jeroen T" <jeroen_t(a)hotmail.com>; <mad-dev(a)lists.mars.org> > Sent: Friday, February 15, 2002 10:23 AM > Subject: Re: Problems when porting to MIPS processor using Greenhills > compiler > > > > --- Jeroen T <jeroen_t(a)hotmail.com> wrote: > > > > > > Hi. I got problems using MADLIB with a MIPS4111 processor and the > > > Greenhills compiler. > > > ... > > > > > > > Hi Jeroen, > > > > Make sure that the 16bit output sample values are not endian-swapped. > > > > Try changing compiler options and optimisation levels. > > > > Post results back to mad-dev (rather than mad-user). > > > > Hope that helps... :-) > > > > Andre > > -- > > > > > > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Everything you'll ever need on one web page > > from News and Sport to Email and Music Charts > > http://uk.my.yahoo.com > > >

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Re: Problems when porting to MIPS processor using Greenhills compiler
by Andre 15 Feb '02

15 Feb '02

--- Jeroen T <jeroen_t(a)hotmail.com> wrote: > > Hi. I got problems using MADLIB with a MIPS4111 processor and the > Greenhills compiler. > ... > Hi Jeroen, Make sure that the 16bit output sample values are not endian-swapped. Try changing compiler options and optimisation levels. Post results back to mad-dev (rather than mad-user). Hope that helps... :-) Andre -- __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com

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lost frames
by gte nico 13 Feb '02

13 Feb '02

Hi, I am using mad0130b in order to compare the pcm output with my decoder. When I decode the sin1k0db.bit mp3 file (test bitstream package v2.2 from fraunhofer), I can not decode : The first frame (like MAD) because of the main_data_begin which point out of the file. The second frame : I decode it because the main_data_begin is valid and I can not understand why this frame is not decoded by MAD. The third frame and the others are well decoded. The last frame can be decoded, but MAD does not do it. I would like to understand the behaviour of the MAD decoder. Which decision permit the decoding of one frame. What is the parsing principle ? and is it normal to avoid decoding these two frames ? Thanks for your answers. Nicolas. _________________________________________________________ Le journal des abonnés Caramail - http://www.carazine.com

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Re: [mad-user] Frame skipping
by Rob Leslie 06 Feb '02

06 Feb '02

Mathieu Dube wrote: > 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. Yes, you can call mad_header_decode() instead. This will only decode the frame header, without decoding the frame's audio data. This sort of discussion really belongs on mad-dev rather than mad-user; I've attempted to set the Reply-To: appropriately. -- Rob Leslie rob(a)mars.org

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Documentation
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-dev February 2002