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682 discussions

question about decode mp3-encoded wav
by shiming dong 22 Jun '04

22 Jun '04

Hi there: I tried to get the raw pcm data from a mp3-encoded riff wav file. Can I use the libmad to do that? I mean, except to the header of the file, is each frame header and data the same as that in the mp3 file? And where can I get such file's format description? Thank you! shiming _________________________________________________________________ FREE pop-up blocking with the new MSN Toolbar get it now! http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/

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Re: Re: [mad-dev] Compiling minimad.c under Windows
by Some One 06 Jun '04

06 Jun '04

Thanks alot. This works perfectly even though it does give a warning saying that "FDM_INTEL" is redefined in "mad.h". However, it decodes an mp3 to pcm fine using "./minimad <track.mp3> track.pcm". >From: Rob Leslie <rob(a)mars.org> >To: mad-dev(a)lists.mars.org >Subject: Re: [mad-dev] Compiling minimad.c under Windows >Date: Sun, 6 Jun 2004 12:45:29 -0700 > >On Jun 6, 2004, at 2:34 AM, Some One wrote: >>Hi, I'm trying to compile minimad.c using Cygwin and GCC. >> >>I've copied the "libmad-0.51.1b" folder into the Cygwin root as "mad" and >>followed all the steps in the "INSTALL" file (configure, make, make >>install). It does all that fine (makes the Makefile and config file, >>creates the objects in the "./deps" folder, installs the mad library in >>"usr/local/lib" and puts "mad.h" in "usr/local/include"). >> >>However, when a try "make minimad" in the "mad" folder, it returns: >>"gcc -Wall -march=i486 -g -O -fforce-mem -fforce-addr -fthread-jumps >>-fcse-follow -jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove >>-fschedule-insns2 -fstrength-reduce >>minimad.c -o minimad >>/cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0xc3): In >>function `input': >>/mad/minimad.c:92: undefined reference to `_mad_stream_buffer' >>/cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x246): In >>function `error': >>/mad/minimad.c:177: undefined reference to `_mad_stream_errorstr' >>/cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x2a7): In >>function `decode': >>/mad/minimad.c:209: undefined reference to `_mad_decoder_init' >>/cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x2b2): >>/mad/minimad.c:215: undefined reference to `_mad_decoder_run' >>/cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x2bc): >>/mad/minimad.c:219: undefined reference to `_mad_decoder_finish' >>collect2: ld returned 1 exit status >>make: *** [minimad] Error 1" >> >>I don't know what I'm doing wrong or even what it means by "undefined >>reference". > >Try instead: make minimad.exe > >-- >Rob Leslie >rob(a)mars.org > _________________________________________________________________ Download games, logos, wallpapers and lots more at MSN Mobile! http://www.msn.com.sg/mobile/

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Compiling minimad.c under Windows
by Some One 06 Jun '04

06 Jun '04

Hi, I'm trying to compile minimad.c using Cygwin and GCC. I've copied the "libmad-0.51.1b" folder into the Cygwin root as "mad" and followed all the steps in the "INSTALL" file (configure, make, make install). It does all that fine (makes the Makefile and config file, creates the objects in the "./deps" folder, installs the mad library in "usr/local/lib" and puts "mad.h" in "usr/local/include"). However, when a try "make minimad" in the "mad" folder, it returns: "gcc -Wall -march=i486 -g -O -fforce-mem -fforce-addr -fthread-jumps -fcse-follow -jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove -fschedule-insns2 -fstrength-reduce minimad.c -o minimad /cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0xc3): In function `input': /mad/minimad.c:92: undefined reference to `_mad_stream_buffer' /cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x246): In function `error': /mad/minimad.c:177: undefined reference to `_mad_stream_errorstr' /cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x2a7): In function `decode': /mad/minimad.c:209: undefined reference to `_mad_decoder_init' /cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x2b2): /mad/minimad.c:215: undefined reference to `_mad_decoder_run' /cygdrive/c/DOCUME~1/USERNAME/LOCALS~1/Temp/ccyf7LL5.o(.text+0x2bc): /mad/minimad.c:219: undefined reference to `_mad_decoder_finish' collect2: ld returned 1 exit status make: *** [minimad] Error 1" I don't know what I'm doing wrong or even what it means by "undefined reference". Thanks in advance for any help. _________________________________________________________________ Watch the online reality show Mixed Messages with a friend and enter to win a trip to NY http://www.msnmessenger-download.click-url.com/go/onm00200497ave/direct/01/

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The madplay can't play mp3.
by kobi.yang＠billionton.com.tw 19 May '04

19 May '04

I have three mp3 songs and the madplay can't play it. Maybe, it is mp3's problem, but i can play those mp3 in the windows media player. Can any body help me to solve this problem. You can download mp3 songs below. Thanks for help. IP: 203.204.108.161 username: test password: 1234

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lost synchronization and CRC check failed
by chikku belli 10 May '04

10 May '04

Hi all, I am new to audio and video decoder, hence would appreciate some help in the beginning. I have an mpg file which has both and audio and video stream encoded. I use libmpeg2 to decode the video and display it on the monitor. I also use libmad to play the audio. when i decode the mpg file i store audio part of the mpg file in a separate file (for ex: audio.ma2). After mpg file decoding is over, i run madplay with the following options. madplay -v /root/audio.ma2 I see the following error message on the screen. MPEG Audio Decoder 0.15.2 (beta) - Copyright Â© 2000-2004 Robert Leslie et al. error: frame 0: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 3: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 6: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 9: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 12: CRC check failed 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 14: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 17: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 20: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 23: CRC check failed 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 25: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 28: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 31: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 34: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 36: lost synchronization 00:00:01 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 39: lost synchronization 00:00:01 Layer II, 224 kbps, 44100 Hz, stereo, CRC could anybody please tell me what could be the problem? regards, -onup Yahoo! India Matrimony: Find your partner online.

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Progress meter
by Hamish Allan 30 Apr '04

30 Apr '04

Hi folks, I've just started writing an audio processing utility, using libmad to read from MP3 files. I've modelled my code on minimad.c and it works fine, but as I'm decoding each file all at once, I want to provide a progress meter. In minimad.c the whole file is mmapped, so the read function only gets called once. I figured I would change my read function to make available a small fraction of the data, update the progress bar, then make the next block available, etc. Unfortunately this doesn't work, I get "lost synchronisation" , "reserved sample frequency value", "bad main_data_begin pointer", "forbidden bitrate value" and "Huffman data overrun" errors each time I return a new block of data. As far as I can tell, my code is doing the right thing (I've included it below). In madllc.c, there is provision for when a frame is not wholly included by a buffer, but I would expect in the case of the high-level functions that this would be detected by mad_decoder_run and the input function would be polled for more data automatically. Am I missing something obvious? Also, is there a better way to implement a progress bar? Thanks in advance, Hamish P.S. this code is in Objective-C: "[inputData length]" does what the C++ "inputdata.length()" would do, and "id" is like "NSObject *" (NSObject is the root object). struct dataDescriptor { NSData *inputData; NSMutableData *outputData; unsigned int bytesRead; unsigned int byteChunk; // number of bytes to read at a time id progressObject; }; static enum mad_flow madInput(void *data, struct mad_stream *stream) { struct dataDescriptor *descriptor = data; NSData *inputData = descriptor->inputData; unsigned int bytesTotal = [inputData length]; unsigned int bytesLeft = bytesTotal - descriptor->bytesRead; double progress = (double)(descriptor->bytesRead) / (double)bytesTotal; [descriptor->progressObject showProgress:progress] if (bytesLeft == 0) return MAD_FLOW_STOP; fprintf(stderr, "Bytes read=%d, left=%d\n", descriptor->bytesRead, bytesLeft); if (bytesLeft > descriptor->byteChunk) bytesLeft = descriptor->byteChunk; mad_stream_buffer(stream, [inputData bytes] + (descriptor->bytesRead), bytesLeft); descriptor->bytesRead += bytesLeft; return MAD_FLOW_CONTINUE; }

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Reordering question
by Grigory A. 21 Apr '04

21 Apr '04

Hi! MAD for sp3r5m 3DSP core www.3dsp.com is ready. In average up to 256 kb/s 27MHz is more than enough to decode any mp3 bitstream. But 320 kb/s - required calculation is very close to available resources (and maybe even worst) Only - I want to improve performance in some places Now I am looking on void III_reorder(mad_fixed_t xr[576], struct channel const *channel, unsigned char const sfbwidth[39]) C implementation takes ~30 000 cycles - it is too much. So could you tell me can I use for reordering this one simple scheme for sb=0 to 31 do //For all 32 subbands for window=0 to 2 do //For each of the 3 windows for ws=0 to 5 do //For each sample within a window Xro[18*sb + ss] = Xdis[18*sb + window + 3*ws] //Reorder end for end for end for If answer is "no" - so could you explain the role of unsigned char const sfbwidth[39] in original MAD reordering function very shortly of course. Thanks for answers -- Best regards, Grigory mailto:Ryhor@tut.by

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save PCM
by Гурин Олег 18 Apr '04

18 Apr '04

Hello. Why do I get PCM with loud noise while decoding? I receive Mp3 stream using HTTP. After mad_synth_frame I record 16-bit values on disk (as in the madlld example). During playback of the PCM obtained the music itself can hardly be heard because of noise ? (Win 2000 platform, libmad ver.0.15.1) --- Ваш легкий поиск ТУТ! http://go.tut.by

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huffman.c macros
by Ian MacIntosh 14 Apr '04

14 Apr '04

I was building this on Solaris and noticed the macros for PTR and V only work for little-endian or gcc compilers. So I made a few changes, below are the macros rewritten for more portability: for huffquad # if defined(__GNUC__) || (__SUNPRO_C >= 0x556) # define PTR(offs, bits) { .ptr = { 0, bits, offs } } # define V(v, w, x, y, hlen) { .value = { 1, hlen, v, w, x, y } } #elif defined(WORDS_BIGENDIAN) # define PTR(offs, bits) { { 0, bits, offs } } # define V(v, w, x, y, hlen) { { 1, hlen, (v << 11) | (w << 10) | \ (x << 9) | (y << 8) } } #else # define PTR(offs, bits) { { 0, bits, offs } } # define V(v, w, x, y, hlen) { { 1, hlen, (v << 0) | (w << 1) | \ (x << 2) | (y << 3) } } # endif for huffpair # if defined(__GNUC__) || (__SUNPRO_C >= 0x556) # define PTR(offs, bits) { .ptr= { 0, bits, offs } } # define V(x, y, hlen) { .value= { 1, hlen, x, y } } # elif defined(WORDS_BIGENDIAN) # define PTR(offs, bits) { { 0, bits, offs } } # define V(x, y, hlen) { { 1, hlen, (x << 8) | (y << 4) } } # else # define PTR(offs, bits) { { 0, bits, offs } } # define V(x, y, hlen) { { 1, hlen, (x << 0) | (y << 4) } } # endif instead of the ptr: and value: it uses the C99 designator syntax, also I've changed the shifts for big-endian. obviously the WORDS_BIGENDIAN needs to come from the config.h. regards, Ian

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Intensity stereo
by Grigory A. 12 Apr '04

12 Apr '04

Hi! Could someone give me or tell where can I take mp3 bitstream with joint stereo Intensity_Stereo_LSF_EXT all other bitsreams have been successfully tested. Only this one is question. If in MAD decoder there is such portion of code - I think it is tested. Thanks. Best regards, Grigory mailto:Ryhor@tut.by

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