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682 discussions

Re: Problems when porting to MIPS processor using Greenhills compiler
by Jeroen T 22 Feb '02

22 Feb '02

Hi. I tried everything. Make all memory zero which is allocated. use calloc in stead of malloc, change to FPM_64BIT and back to FPM_DEFAULT. Changing optimization. Everytime I get the same picture. Nothing helps... Single stepping through the code is also not an option, I don't know anything about MP3 decoding at all. I need an other compiler I think. Somebody knows a free MIPS VR4111 C compiler? Greetz, Jeroen >From: Andre <armccurdy(a)yahoo.co.uk> >To: Jeroen <jeroen_t(a)hotmail.com>, mad-dev(a)lists.mars.org >Subject: Re: Problems when porting to MIPS processor using Greenhills >compiler >Date: Fri, 15 Feb 2002 12:07:09 +0000 (GMT) > >Jeroen, > >A MIPS connected to a television... cool !! > >The waveform looks like its from the start of decoding (ie the first >few frames). If you look at the output after many more frames does it >get any closer to what you expect ?? > >Try zeroing the malloc'ed memory in layer3.c and decoder.c before it >is used (or remove the mallocs and use static arrays). > >Try defining FPM_64BIT instead of FPM_DEFAULT and recompiling. > >Did you have to do anything strange to the source or Makefiles to get >libmad to build with the ghs compiler ?? > >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 _________________________________________________________________ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com

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Processing power required to decode MP3's
by Ira Weiny 21 Feb '02

21 Feb '02

Hello, We would like to use libmad to do multiple decodes simultaniously. I don't know much about the decoding algorithm and was wondering if it takes a different amount of CPU power to decode different MP3's. For example, are there MP3's which are somehow more "complex" and require more CPU horsepower to decode than others? Thanks, Ira Weiny iweiny(a)acm.org

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Building MAD with BCC55
by S.Sekar 17 Feb '02

17 Feb '02

Hi, Has anyone ever tried to build MADPlay using BCC55 (ie. Borland freeCommandline tool) with vide ??? What is EINTR ??? It is undefined. What to do with extern char const mad_version[]; extern char const mad_copyright[]; extern char const mad_author[]; extern char const mad_build[]; Because vide/BCC55 reports ! Error: Unresolved external '_ver_license' referenced from C:\ITMC\SEKAR\M * AD\MAD-0.14.2B\MADPLAY.OBJ ! Error: Unresolved external '_optarg' referenced from C:\ITMC\SEKAR\MAD\MA * D-0.14.2B\MADPLAY.OBJ ! Error: Unresolved external '_getopt_long' referenced from C:\ITMC\SEKAR\M * AD\MAD-0.14.2B\MADPLAY.OBJ ! Error: Unresolved external '_filter_free' referenced from C:\ITMC\SEKAR\M * AD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_stream_buffer' referenced from C:\ITMC\S * EKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_xing_parse' referenced from C:\ITMC\SEKAR\MA * D\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_filter_run' referenced from C:\ITMC\SEKAR\MA * D\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_field_getnstrings' referenced from C:\IT * MC\SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_field_getstrings' referenced from C:\ITM * C\SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_genre_name' referenced from C:\ITMC\SEKA * R\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_field_getstring' referenced from C:\ITMC * \SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_field_getfullstring' referenced from C:\ * ITMC\SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_ucs4_latin1duplicate' referenced from C: * \ITMC\SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_tag_findframe' referenced from C:\ITMC\S * EKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_resample_init' referenced from C:\ITMC\SEKAR * \MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_resample_block' referenced from C:\ITMC\SEKA * R\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_tag_parse' referenced from C:\ITMC\SEKAR * \MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_tag_query' referenced from C:\ITMC\SEKAR * \MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_tag_delete' referenced from C:\ITMC\SEKA * R\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_stream_skip' referenced from C:\ITMC\SEK * AR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_stream_errorstr' referenced from C:\ITMC * \SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_frame_mute' referenced from C:\ITMC\SEKA * R\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_xing_init' referenced from C:\ITMC\SEKAR\MAD * \MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_decoder_init' referenced from C:\ITMC\SE * KAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_decoder_run' referenced from C:\ITMC\SEK * AR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mad_decoder_finish' referenced from C:\ITMC\ * SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_file_fdopen' referenced from C:\ITMC\SEK * AR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_file_tag' referenced from C:\ITMC\SEKAR\ * MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_id3_file_close' referenced from C:\ITMC\SEKA * R\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_filter_new' referenced from C:\ITMC\SEKAR\MA * D\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_fadein_filter' referenced from C:\ITMC\SEKAR * \MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_equalizer_init' referenced from C:\ITMC\SEKA * R\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_equalizer_filter' referenced from C:\ITMC\SE * KAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_mono_filter' referenced from C:\ITMC\SEKAR\M * AD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_audio_control_init' referenced from C:\ITMC\ * SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_audio_error' referenced from C:\ITMC\SEKAR\M * AD\MAD-0.14.2B\PLAYER.OBJ ! Error: Unresolved external '_ver_banner' referenced from C:\ITMC\SEKAR\MA * D\MAD-0.14.2B\MADPLAY.OBJ ! Error: Unresolved external '_audio_output' referenced from C:\ITMC\SEKAR\ * MAD\MAD-0.14.2B\MADPLAY.OBJ ! Error: Unresolved external '_optind' referenced from C:\ITMC\SEKAR\MAD\MA * D-0.14.2B\MADPLAY.OBJ ! Warning: Public symbol '_EINTR' defined in both module C:\ITMC\SEKAR\MAD\ * MAD-0.14.2B\MADPLAY.OBJ and C:\ITMC\SEKAR\MAD\MAD-0.14.2B\STRNCASECMP.OBJ ! Warning: Public symbol '_EINTR' defined in both module C:\ITMC\SEKAR\MAD\ * MAD-0.14.2B\MADPLAY.OBJ and C:\ITMC\SEKAR\MAD\MAD-0.14.2B\PLAYER.OBJ 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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Re: Problems when porting to MIPS processor using Greenhills compiler
by Andre 15 Feb '02

15 Feb '02

Jeroen, A MIPS connected to a television... cool !! The waveform looks like its from the start of decoding (ie the first few frames). If you look at the output after many more frames does it get any closer to what you expect ?? Try zeroing the malloc'ed memory in layer3.c and decoder.c before it is used (or remove the mallocs and use static arrays). Try defining FPM_64BIT instead of FPM_DEFAULT and recompiling. Did you have to do anything strange to the source or Makefiles to get libmad to build with the ghs compiler ?? 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 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

1 0

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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Re: bitrate addition to libid3tag ?
by Bastien Nocera 26 Jan '02

26 Jan '02

Hi, After getting my mail nicely rejected ;) I tried the nice advice of using the TLEN frame. However very few (actually in my collection, none) mp3 files have such a frame. Would anybody have some code snippet that I could use to get the nominative bitrate of a file, by using the id3_tag ? Cheers On Sat, 2002-01-26 at 05:06, mad-dev-admin(a)lists.mars.org wrote: <snip> > To answer your question, "bitrate detection" would not be an > appropriate feature to add to libid3tag. However, you may be able to > approximate the average bitrate using the file size and the TLEN frame > from the ID3 tag. > > Calculating the actual bitrate requires decoding MPEG audio frames, > which is done by libmad (not libid3tag.)" -- /Bastien Nocera http://hadess.net

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