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682 discussions

Announce: MAD now included in the Comprehensive Source Database (CSDB)
by Enrico Weigelt 03 Aug '06

03 Aug '06

Hi folks, I'd like you to know that the MAD packages are now included in the comprehensive source database (CSDB): http://sourcefarm.metux.de/ regards, -- --------------------------------------------------------------------- Enrico Weigelt == metux IT service phone: +49 36207 519931 www: http://www.metux.de/ fax: +49 36207 519932 email: contact(a)metux.de cellphone: +49 174 7066481 --------------------------------------------------------------------- -- DSL ab 0 Euro. -- statische IP -- UUCP -- Hosting -- Webshops -- ---------------------------------------------------------------------

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Libid3tag documentation, again
by Alexander Thomas 05 Jul '06

05 Jul '06

I have started writing a little program that uses libid3tag to read id3 tags, add a few tags, and write the result back to the mp3 file. This seemed trivial, but it took me about 2 days and tons of segfaults and weird behavior to come up with something that starts to go in the right direction. Google sent me to about 10 different websites during my quest for information, with each site giving a small piece of the puzzle. At many times I suspected id3tag to be full of bugs, but I soon realized that the 'bugs' were just due to the way I (mis)interpreted the functions. If someone has the time for it, I would really suggest to write some documentation, and bundle it with the software. A few well-documented simple demo programs which read, modify, and write tags would already be incredibly useful. It would also be nice if the id3tag.h file would be a bit more 'verbose', i.e. if the function prototypes would use actual argument names which make sense, and a short description and caveats for each function. It seems like libid3tag is not widely used, although it has a lot of potential. I think the lack of documentation is a major cause of this... Alexander

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Strange libid3tag.lib crash
by Adam Davison 01 Jul '06

01 Jul '06

I'm a developer from the mixxx project (http://mixxx.sf.net) which uses libid3tag. On linux the library works perfectly. On windows however, we're having a strange problem. Linking against libid3tag-release.lib on MSVC Express causes a segfault when we call id3_file_close, however, linking against the debug version seems to work fine. For the previous release of mixxx, we linked against the release library using a previous version of MSVC and it worked fine. I've tried rebuilding the newest release of the libid3tag source and got the same result. I'm hoping someone on the list has seen this kind of problem before or can at least give me some kind of insight into why this might be happening. Is linking with MSVC Express a known problem? Any help at all would be very much appreciated. Adam D

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libid3tag: Prevent infinite loop when parsing invalid utf-16
by Kurt Roeckx 18 Jun '06

18 Jun '06

Hi, When there is an UTF-16 sequence with an odd number of bytes, which is clearly broken, libid3tag will keep in an infinite loop trying to parse the last byte. The attached patch fixes it by saying we actually parsed the last byte, and seems to work without problems so far. Kurt

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libmad configure error on Windows's Cygwin
by Jun Guo 18 Jun '06

18 Jun '06

When ran configure on Windows's Cygwin,I got the follow errors. The libmad is libmad-0.15.1b.Cygwin is full installed. Any ideas? $ ./configure --host=mingw32 configure: WARNING: If you wanted to set the --build type, don't use --host. If a cross compiler is detected then cross compile mode will be used. checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for mingw32-strip... no checking for strip... strip checking build system type... i686-pc-cygwin checking host system type... i386-pc-mingw32 checking for mingw32-gcc... no checking for gcc... gcc checking for C compiler default output file name... a.exe checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... .exe checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking for style of include used by make... GNU checking dependency style of gcc... gcc3 checking for a sed that does not truncate output... /usr/bin/sed checking for egrep... grep -E checking for ld used by gcc... /usr/i686-pc-cygwin/bin/ld.exe checking if the linker (/usr/i686-pc-cygwin/bin/ld.exe) is GNU ld... yes checking for /usr/i686-pc-cygwin/bin/ld.exe option to reload object files... -r checking for BSD-compatible nm... nm checking whether ln -s works... yes checking how to recognise dependent libraries... file_magic file format pei*-i38 6(.*architecture: i386)? checking how to run the C preprocessor... /lib/cpp configure: error: C preprocessor "/lib/cpp" fails sanity check See `config.log' for more details.

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Decode the UCS4 to the current locale instead of latin1.
by Kurt Roeckx 17 Jun '06

17 Jun '06

Hi, madplay currently always converts the id3 tag information to latin1. The attached patch converts it to the currently codeset based on nl_langinfo(CODESET). It seems the configure script already checks for nl_langinfo and iconv with the automake macro's, so I didn't have to patch configure for this. Maybe those function belong in libid3tag instead, it would be more logical. It would also not require us to use non-exported functions. The reason I just put it in madplay is that this only require me to change one source package. There is one problem with this patch that I know of, and that is that it doesn't properly deal with (argualby broken) iconv() implementations saying the input sequence is invalid when it can't map a valid input character to the output encoding, and I'm not sure how to deal with it, see the comment. Kurt

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per-entity ID3v2/ID3v1 information?
by Mikhail Gusarov 17 Jun '06

17 Jun '06

Hello, Is it possible to add to libid3tag either disabling ID3v1 tags parsing during tag parse or fine-grained information about where the tag part was read? The use-case is the file with non-Latin encoding in id3v1 and ID3v2 To properly decode such a tag the info is needed what part of tag was read from v1 (now it's only coarse grained flag "there is id3v1 in file", which does not indicate what part of tag is actually read from the v1 tags). Another option is disabling id3v1 parsing: application may read and encode/decode v1 tags on it's own. -- JID: dottedmag(a)jabber.dottedmag.net

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How to compile sox with libmad?
by Jun Guo 16 Jun '06

16 Jun '06

Hi all: I want sox to support mp3,and try to compile them with VC++6,but failed. Does anyone knows how to compile them or provide the compiled sox to be shared?

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Handling ID3 tags with non-latin1 encoding
by s.huelswitt＠gmx.de 07 Jun '06

07 Jun '06

Hi, I have a question regarding handling of ID3 tags which are non-latin1 encoded e.g. iso-8859-5. I think I can get ucs4 strings from libid3tag and convert them with iconv to whatever codeset originaly was used. How can I get information about the original codeset? Is there another designated way to handle these cases? My current code to get a string for an ID3 tag is (FYI: it's VDR-MP3 player plugin): void cScanID3::ParseStr(const struct id3_tag *tag, const char *id, char * &data) { const struct id3_frame *frame=id3_tag_findframe(tag,id,0); if(!frame) return; free(data); data=0; const union id3_field *field=&frame->fields[1]; if(id3_field_getnstrings(field)>0) { const id3_ucs4_t *ucs4=id3_field_getstrings(field,0); if(!ucs4) return; if(!strcmp(id,ID3_FRAME_GENRE)) ucs4=id3_genre_name(ucs4); id3_latin1_t *latin1=id3_ucs4_latin1duplicate(ucs4); if(!latin1) return; data=strdup((char *)latin1); free(latin1); } } Obviously the code yields bad results, if the string wasn't in latin1 originaly. TIA. Regards. -- Stefan Huelswitt s.huelswitt(a)gmx.de | http://www.muempf.de/

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Madplay fails to build on OSX x86
by ObjM2 09 May '06

09 May '06

I tried building madplay under OSX 10.4.6 both on PPC and Intel. The PPC build failed with a duplicate declaration of function wait() which I was able to fix by simply commenting that function out in audio_carbon.c. However, the Intel build fails with a whole bunch of errors which I was unable to work around. has anybody managed to build madplay on OSX for Intel yet? thanks in advance ___________________________________________________________ Yahoo! Photos � NEW, now offering a quality print service from just 7p a photo http://uk.photos.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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Documentation
by MUNDOALEM.com 17 Mar '06

17 Mar '06

Hi, I'm starting to code with libmad and libid3tag now builting and mp3 player with my need just for studying purposes. I'm coding with ANSI C, I don't program in C++. And I have found lack or none documentation of libmad and libid3tag. So if o you know any website or even doc files which explains how to use this libs I'll apreciate it. So thank you very much. --------------------- MUNDOALEM.com Entreternimento Digital

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Compiling zlib library
by Arpita Ghosh 10 Mar '06

10 Mar '06

We are trying to compile the zlib library using DSP16k compiler - cc16k. I get an error saying the symbol "__vsnprintf" was not found. Can anyone tell me how I can get around this problem? Thanks.

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The test code for mp3 decoder compliance
by Li Xiaochao.Jeff 12 Feb '06

12 Feb '06

Hello, Does anyone has the ideal about how to test the libmad output quality or compliant test? Or did anyone write the similar test for Libmad before? Best regards, Li xiaochao.Jeff

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How to use the libmad low-level API
by Håvard Engebretsen 10 Feb '06

10 Feb '06

Hi! I am currently decoding mp3 files using the minimad mp3-decoder and the high-level API. Can anybody tell me how to use the low-level API instead of the high-level? Regards Håvard.

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Re: mad-dev Digest, Vol 9, Issue 2
by Li Xiaochao.Jeff 08 Feb '06

08 Feb '06

Lowering the precision might affect the final quality of audio output. "defining MAD_F_FRACBITS to 16 bits" might cause the inferior quality, while the original precision is 28bits for Libmad. I am wondering if the song could be acceptable that way. Best regards, Li xiaochao.Jeff ----- Original Message ----- From: <mad-dev-request(a)lists.mars.org> To: <mad-dev(a)lists.mars.org> Sent: Friday, February 03, 2006 4:00 AM Subject: mad-dev Digest, Vol 9, Issue 2 > Send mad-dev mailing list submissions to > mad-dev(a)lists.mars.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.mars.org/bin/mailman/listinfo/mad-dev > or, via email, send a message with subject or body 'help' to > mad-dev-request(a)lists.mars.org > > You can reach the person managing the list at > mad-dev-owner(a)lists.mars.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of mad-dev digest..." > > > Today's Topics: > > 1. Reducing preision on intermediate data in minimad during > decoding (H?vard Engebretsen) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 2 Feb 2006 15:37:53 +0100 > From: H?vard Engebretsen <havardsp(a)stud.ntnu.no> > Subject: [mad-dev] Reducing preision on intermediate data in minimad > during decoding > To: <mad-dev(a)lists.mars.org> > Message-ID: <20060202143738.045A913C480(a)merke.itea.ntnu.no> > Content-Type: text/plain; charset="iso-8859-1" > > Hi! > > > > I am looking into the possibility of lowering the precision of the > intermediate data in minimad during decoding (i.e. defining MAD_F_FRACBITS > to 16 bits). Does anyone know if this will work, or will the lowered > precision corrupt the decoded data? > > > > Regards, > > Haavard > >

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Reducing preision on intermediate data in minimad during decoding
by Håvard Engebretsen 02 Feb '06

02 Feb '06

Hi! I am looking into the possibility of lowering the precision of the intermediate data in minimad during decoding (i.e. defining MAD_F_FRACBITS to 16 bits). Does anyone know if this will work, or will the lowered precision corrupt the decoded data? Regards, Haavard

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Madplay with uClibc
by janiszo＠poczta.onet.pl 01 Feb '06

01 Feb '06

Hi, Is it possible to run madplay with uClibc library? If so, how can I do it. Should I compile it togeather somehow, or can I just use it instead of standard libc redirecting the link? I'm using ARM core and when I use compiled uClibc lib set instead of libc I get: /lib/libc.so.6: no version information avaiable .... and relocation error: /lib/libgcc_s.so.1: symbol __cxa_finalize ....... using standard big (30MB!) libc works madplayer fine. Jack

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error linking to libid3tag
by Alex 27 Jan '06

27 Jan '06

Hello, I have compiled libid3tag with mingw on windows. When linking with libid3tag, I have this error : configure:20404: gcc -o conftest.exe -g -O2 conftest.c -lid3tag -lmad -lvorbisfile >&5 c:/mp3splt_mingw/bin/../lib/gcc-lib/mingw32/3.2.3/../../../libid3tag.a(util.o)(.text+0x152): In function `id3_util_compress': C:/MinGW/home/admin/mp3splt/libid3tag/util.c:106: undefined reference to `compress2' c:/mp3splt_mingw/bin/../lib/gcc-lib/mingw32/3.2.3/../../../libid3tag.a(util.o)(.text+0x1e4): In function `id3_util_decompress': C:/MinGW/home/admin/mp3splt/libid3tag/util.c:139: undefined reference to `uncompress' You have probably already encountered this error , but I have searched on the net, have found a solution but did not understand it. If I link with -lz it works but why do I have to link with -lz (libid3tag should already be linked with -lz) ? Any help would be appreciate. -- Munteanu Alexandru --------------------------------- Nouveau : téléphonez moins cher avec Yahoo! Messenger ! Découvez les tarifs exceptionnels pour appeler la France et l'international.Téléchargez la version beta.

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[mad-dev] Re: seeking, jumping to a certain position within mp3 file
by Li Xiaochao.Jeff 27 Jan '06

27 Jan '06

As I know, the mp3 file is organized in frame base which means it might not jump to a specific sample number(if it is the original input, compressed data). And the decoding process is much dependent upon the integrity of the frame. By the way, I am also wondering what is the scenario it might be useful about this feature? Best regards, Li xiaochao.Jeff ----- Original Message ----- From: <mad-dev-request(a)lists.mars.org> To: <mad-dev(a)lists.mars.org> Sent: Thursday, January 19, 2006 4:00 AM Subject: mad-dev Digest, Vol 8, Issue 4 > Send mad-dev mailing list submissions to > mad-dev(a)lists.mars.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.mars.org/bin/mailman/listinfo/mad-dev > or, via email, send a message with subject or body 'help' to > mad-dev-request(a)lists.mars.org > > You can reach the person managing the list at > mad-dev-owner(a)lists.mars.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of mad-dev digest..." > > > Today's Topics: > > 1. seeking, jumping to a certain position within mp3 file > (felber.michael(a)gmx.net) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 18 Jan 2006 20:39:37 +0100 > From: <felber.michael(a)gmx.net> > Subject: [mad-dev] seeking, jumping to a certain position within mp3 > file > To: <mad-dev(a)lists.mars.org> > Message-ID: <200601181934.k0IJYNEe008160(a)surveyor.mars.org> > Content-Type: text/plain; charset="us-ascii" > > Hi, > > does libmad provide the possibility to jump to a certain position within a > mp3-file? > > Is it possible to jump to a certain sample number (e.g. 44100, 88200) within > a mp3-file? > > Ciao, Michael > > > > > End of mad-dev Digest, Vol 8, Issue 4 > *************************************

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Newbie - How to skip backward in steam?
by Jim Witte 27 Jan '06

27 Jan '06

Hi, I'm working on the Apple Newton port of MAD. How do you get the player to skip backward in the stream? I can skip forward using mad_stream_skip, but it won't take negative offsets. I tried calling mad_stream_buffer again to restart the current buffer playing from the beginning, but this causes the sound to stop (this may be because of the way the Newton sound architecture operates - if MAD is unable to decode anything, the buffer back to the NOS is empty, and it shuts down the sound codec). Can I just set stream->this_frame and stream- >next_frame directly? What does stream_sync do? Thanks, Jim Witte jim3416(a)hotpop.com

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can I use MAD to fade and split an MP3?
by Chris Dawson 26 Jan '06

26 Jan '06

I am interested in using MAD to fade out at an arbitrary point in an arbitrary MP3 file and then potentially split the file at the end of the fade out. Is MAD appropriate for this? If not, does anyone have suggestions for other OSS libraries that can assist with this kind of thing. I could probably use sox after ripping the file to wav with mplayer, but the roundtrip conversion from MP3 -> WAV -> MP3 would probably degrade the file significantly, so I would prefer not to do that. Thanks, Chris

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