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682 discussions

libmad-0.15.1b fails to compile on cfarm230
by Martin Guy 02 Aug '24

02 Aug '24

Hi! I'm finding libmad's compilation fails on cfarm230.cfarm.net, an EdgeRouter4 (big-endian) mips64 Cavium Octeon III V0.2 FPU V0.0 Debian 10.13 buster 4.9.79-UBNT_E300 with gcc (Debian 8.3.0-6) 8.3.0 saying In file included from layer12.c:34: layer12.c: In function 'I_sample': fixed.h:307:5: error: impossible constraint in 'asm' asm ("mult %2,%3" \ ^~~ fixed.h:455:8: note: in expansion of macro 'MAD_F_MLX' MAD_F_MLX(__hi, __lo, (x), (y)); \ ^~~~~~~~~ layer12.c:94:10: note: in expansion of macro 'mad_f_mul' return mad_f_mul(sample, linear_table[nb - 2]); ^~~~~~~~~ make[2]: *** [Makefile:383: layer12.lo] Error 1 If I configure with --disable-osa instead I get the same error and it needs ./configure --enable-fpm=default to work. Am I missing something, or is that what it should do? M

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Audio playback scrubbing - time/frame calculation?
by Jim Witte 19 Apr '18

19 Apr '18

What is a good way to implement “scrubbing” during playback if you’re application doesn’t keep a continuous buffer of uncompressed audio? Thanks,

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XAudio2 audio playback after decoding mp3 from libmad
by Maester Rowen 21 Apr '17

21 Apr '17

Hello! I have successfully decoded my 16-bit MP3 using libmad. I am having an extremely difficult time getting playback through Microsoft's XAudio2 API. I can get the audio data to play, but it is heavily distorted, levels are peaking and it just sounds not good. I took a look at many open source mp3 players using libmad, and all of the ones that play correctly are using DirectSound. If anyone has any experience with this, I would love to receive any tips you have. Thanks!

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decoding error 0x0235 (bad main_data_begin pointer) at byte offset 0 error
by hayayaya＠nifty.com 29 May '16

29 May '16

hello. If my callback function output() return MAD_FLOW_CONTINUE, I get no error. But the same function return MAD_FLOW_STOP, then I get error of title. This error is not always occurred. 1st frame of function decode(), error has not occurred. 1frame and 8bytes of next frame is not broken. I think I use the wrong way. but how wrong,I don't know. Please advice me how to use libmad with output() return MAD_FLOW_STOP.

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Compiling libmad standalone static lib
by Aruna VIjay 02 Sep '14

02 Sep '14

Dear All, I am just trying to compile libmad to port in DSP. I am struggling to develope it as a standalone lib. i added all the .c. .h.data file in the eclipse IDE -GCC compiler flags -c -Wall -static -g -O -fforce-addr -fthread-jumps -fcse-follow-jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove -fschedule-insns2 i used the minimad.c as a wrapper to this application since either i get segmentation fault or only noise without the flags. Anybody give any idea how to proceed. note:The wrapper works well with the PC build. So i have problem only with my static library. Thanks in advance. Vijay Mukilan S

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libmad on ARM64
by grosvenor＠gmail.com 26 Mar '14

26 Mar '14

Hello libmad devs, My name is Matthew Grosvenor, and as part of a project in association with Lenaro, I'm looking at different Fedora linux packages to port or recode with C if possible in order to get them to compile/run properly on ARM64 hardware. I'm wondering if this is something that's perhaps going on already behind the scenes, and if it's something worth undertaking. I'm going to take a cursory grep around the code to see what actual x86 assembler is in the code to see if it's feasible given some of my time constraints. If you have any advice or feedback on this, I'd love to hear it. Just let me know, Thanks, Matthew

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Error decoding an mp3 stream
by Louis Latreille 15 Mar '14

15 Mar '14

Hello everyone, I have an issue with the mad_decoder. I am currently developing a media server using live555 to stream the data, and libmad to decode the stream received. Currently, I am able to receive the stream perfectly into a file, and it is fully playable through a player (i.e. windows media player). Though, I want to play it with my own program, so I need to decode the stream received. I tried including the minimad test program into my projet with live555, but I am getting the error : decoding error 0x0101 (lost synchronization) at byte offset 0. Here is the function where the mad_decoder is called: void SoundSink::afterGettingFrame(unsigned frameSize, unsigned numTruncatedBytes, struct timeval presentationTime){ if (numTruncatedBytes > 0) { envir() << "FileSink::afterGettingFrame(): The input frame data was too large for our buffer size (" << fBufferSize << "). " << numTruncatedBytes << " bytes of trailing data was dropped! Correct this by increasing the \"bufferSize\" parameter in the \"createNew()\" call to at least " << fBufferSize + numTruncatedBytes << "\n"; } addData(fBuffer, frameSize, presentationTime); if (fOutFid == NULL || fflush(fOutFid) == EOF) { // The output file has closed. Handle this the same way as if the input source had closed: if (fSource != NULL) fSource->stopGettingFrames(); onSourceClosure(); return; } if (fPerFrameFileNameBuffer != NULL) { if (fOutFid != NULL) { fclose(fOutFid); fOutFid = NULL; } } decode((const unsigned char *)"test.mp3", frameSize); //mad_decoder continuePlaying();} In this function I give the decode function (same as in minimad.c) the mp3 file that receives the stream, and the frameSize given by live555 API, which is usually at 1045. static int decode(unsigned char const *start, unsigned long length){ struct buffer buffer; struct mad_decoder decoder; int result; /* initialize our private message structure */ buffer.start = start; buffer.length = length; /* configure input, output, and error functions */ mad_decoder_init(&decoder, &buffer, input, 0 /* header */, 0 /* filter */, output, error, 0 /* message */); /* start decoding */ result = mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC); /* release the decoder */ mad_decoder_finish(&decoder); return result;} The mad_decoder goes directly into the error function, and outputs nothing due to the error 0x0101 Any help would be greatly useful, Louis

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libid3tag: parsing UTF16 in STRINGLIST can result in infinite loop
by Tomáš Nechutný 16 Feb '14

16 Feb '14

Hello. The loop that parses strings from STRINGLIST in field.c on line 294 depends only on length parameter and on function id3_utf16_deserialize() to move the pointer *ptr by length or more in case of UTF16. However, in several files with UTF16 ID3 tags on my PC the *ptr pointer was moved by one byte less. Following calls of id3_utf16_deserialize() didn't move pointer at all so the loop would continue forever or until field->stringlist.strings filled whole memory. I'm not sure if it's fault of invalid ID3 tags but the library should certainly recover from it. Because the last byte is always string terminator I fixed it with horrible hack I attached. I have no idea if it's correct but it avoided the infinite loop so far. I'd love to privately send you test C source and test file with ID3 tags if you're interested. I'm sorry for my dirty half-analysis. I already gave up on MPD which was the only reason why I was debugging this problem.

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[PATCH] Fix MIPS assembly to work with recent GCC
by Mark H Weaver 07 Nov '13

07 Nov '13

This patch fixes the MIPS assembly code to work with recent versions of GCC, where the "=h" constraint is no longer supported. Regards, Mark --- libmad/fixed.h.orig 2004-02-16 21:02:03.000000000 -0500 +++ libmad/fixed.h 2011-10-29 18:47:21.000000000 -0400 @@ -304,8 +304,8 @@ * significant bit depends on OPT_ACCURACY via mad_f_scale64(). */ # define MAD_F_MLX(hi, lo, x, y) \ - asm ("mult %2,%3" \ - : "=l" (lo), "=h" (hi) \ + asm ("mult %2,%3\n\tmfhi %1" \ + : "=l" (lo), "=r" (hi) \ : "%r" (x), "r" (y)) # if defined(HAVE_MADD_ASM)

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libid3tag Windows DLL source package available
by Chris Korda 04 Aug '13

04 Aug '13

I made a version of libid3tag that builds a Windows DLL instead of a static library, using reasonably modern tools. My package includes Visual Studio 2008 project files suitable for building both 32-bit and 64-bit targets. The DLL exports only a subset of the library's functions, but this is easily changed by editing libid3tag.def. The C source files are identical to the original 0.15.1b distribution, except for a single one-line change to id3tag.h: an id3_free function was added. DLLs should free any memory they allocate, and if these allocations are directly exposed to the user, the DLL should provide a method for freeing them, so that the freeing can be done by the DLL's heap manager, which may differ from the application's. In a DLL version of libid3tag, strings allocated by functions such as id3_ucs4_latin1duplicate MUST be freed via id3_free instead of free, otherwise the heap will likely be corrupted, potentially crashing the application. The source package is available here: http://sourceforge.net/projects/waveshop/files/tools/libid3tag/ Best regards, Chris Korda http://waveshop.sourceforge.net/

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