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292 discussions

ask some mp3 decoder problem
by 徐生 08 Aug '05

08 Aug '05

hi: i'm try to decode the mp3 according to the 11172-3 standard,but now i have some problem,can anybody help me? 1.when i decode the huffman code,how can i do if bits need from huffman decode is more/less than the side information infer? 2.when i decode the huffman code,for example,"011001001"form bitstream,but this bitstream cannot find huffman code in huffman table,what should i do?i mean,it has search from least bits from most bits(for example,from 2bits to 9bits),excuse my poor english _________________________________________________________________ 免费下载 MSN Explorer: http://explorer.msn.com/lccn/

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Decoding and playing MP3 while doing something else
by Jeroen Taverne 02 Jul '05

02 Jul '05

Hi. I am implementing a very simple MP3 player on an ARM architecture using a CF harddisk. To safe power I am reading as much data as possible in one time from the harddisk, so it will goto standby mode. What I would like to do is this: Load as much possible MP3 data from multiple files in a 24MB cyclic buffer. Start decoding and playing. Playing is done using double buffered DMA. When 16MB of data is decoded and played, 16MB is read again from harddisk, overwriting the decoded and played data. During loading of these 16MB the decoding and playing continues of the 8MB that's still in the cyclic buffer. This is repeated all the time. I can't use MAD's SYNC mode for this, because the decoder "hangs" and at some time the buffer is empty. I don't want to use multi threading, as I don't have an OS at all. So maybe I have to use ASYNC mode??? Then the decoder directly returns, so I can do some other things like disk reading while decoding. But I can't find any simple example how to use ASYNC mode. When the decoder return I need some way to "kick" the decoder again, so it does a little decoding and then returns again. I don't know how the messaging system works of MAD in ASYNC mode. Does someone have a simple example for me? Best regards, Jeroen

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sample code to obtain mp3 data
by yoshita nanda 16 Jun '05

16 Jun '05

hi all I am a masters student doing project on audio classification. I need the mp3 data as uncompressed floating point values. Since i need to concentrate on classification part of projcet it is very neccessary for me to obtain a code that outputs the mp3 data. If anyone can help me with the code that includes Madlib library and outputs the mp3 data. Regards Yoshita _________________________________________________________________ Be the first to hear what's new at MSN - sign up to our free newsletters! http://www.msn.co.uk/newsletters

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madplay: build problems
by Axel Böhm 18 May '05

18 May '05

hi there, i tried to build libid3tag, mad and madplay. libid3tag and mad worked fine, madplay doesn't seem to work. i did the usual ./configure, make, make check and make install for all of them, except madplay. see below for the output of the make command for madplay. my build environment is a common ubuntu installation. used versions: libid3tag_0.15.1b mad_0.14.2b madplay_0.15.2b output (until here everything worked fine): gcc -Wall -march=i486 -g -O2 -o madplay madplay.o getopt.o getopt1.o version.o resample.o filter.o tag.o crc.o rgain.o player.o audio.o audio_aiff.o audio_cdda.o audio_hex.o audio_null.o audio_raw.o audio_snd.o audio_wave.o audio_oss.o -lmad -lid3tag -lm resample.o(.text+0x1d): In function `resample_init': /home/axel/mydocs/src/madplay_0.15.2b/resample.c:46: undefined reference to `mad_f_div' collect2: ld returned 1 exit status make[2]: *** [madplay] Error 1 make[2]: Leaving directory `/home/axel/mydocs/src/madplay_0.15.2b' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/axel/mydocs/src/madplay_0.15.2b' make: *** [all] Error 2 any help is welcome. thanks in advance. axel

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MAD in C# .Net (libMAD.dll)
by Sondre 15 Apr '05

15 Apr '05

Hallo! I want to make my own music player with MAD decoder in Visual Studio C# .Net. My operating system is Windows XP Pro. Have someone used libMAD.dll in C# .Net to play mp3 files? How can I play mp3 files in C# with MAD? I need help please!!! Yours faithfully Sondre Garmo

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madplay watchdog signals?
by Matthew Rubenstein 23 Feb '05

23 Feb '05

Howdy - I'm running madplay on an iPaq3670/Familiar0.8 (ARM arch) with a CF ethernet card. I play Shoutcast MP3 streams by piping wget -o - <stream-url> | madplay - , and it works really well - realtime decoding, full sound, no fan, otherwise useless HW :). But every 10-30 minutes or so, I get a net/Inet hiccup that interrupts the stream connection. wget hangs, and no data gets to madplay. I want to set up another process to watch madplay, and kill it when it stops playing, then restart it - this always works manually. But madplay doesn't seem to reliably emit output status info. the --verbose flag sends an updated "seconds" counter, but, since it doesn't send any newlines, it can't be parsed by piping it to a "read" in a shell script. And redirecting it to a file doesn't reliably update the file's ctime, either. If I "madplay -o wave:- | tee >/dev/dsp |watchdog", the system performance grinds to a halt, unlistenable. I just want any technique that keeps my wget | madplay pipeline restarted all the time, with a minimum of restarts, which make an audible "clunk". Short of recoding (and cross-compiling) libmad with extra status hooks, is there any way to keep this little engine churning? -- (C) Matthew Rubenstein

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Winamp MAD plugin buffer
by Andrei Tarkovsky 01 Feb '05

01 Feb '05

The original Nullsoft Winamp MP3 decoder has a option called "Full file buffering". This option loads the entire MP3 into memory rather than reading it from disc during playback. This completely eliminates skipping as well as allowing MP3s to be deleted while they are still playing back... a very useful function for cleaning up large MP3 collections. I was wondering if there is any way to achieve a similar buffer with the MAD winamp input plug. Any advice would be greatly appreciated. Cheers, Tarkovsky

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Time Duration In MAD.
by Senthil Nathan G 11 Jan '05

11 Jan '05

Hi All, NewBie Question : How does one find the time duration without decoding an MP3. Is it possible. (Without looking at any header also since this might be wrong ). How do I decode a particular time period ( say from 30 sec to 45 secs ) of a given MP3 in MAD. ( or where should I look to find the answers ). Thanks very much for all help. Senthil ( INDIA )

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minimad.c change sampling frequency
by bobby digital 03 Jan '05

03 Jan '05

Hello everyone! How can I change the sampling frequency from 44khz to 48khz easily in minimad.c, that is, in the highlevel api? Thanks, steels. -- ______________________________________________ Check out the latest SMS services @ http://www.linuxmail.org This allows you to send and receive SMS through your mailbox. Powered by Outblaze

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S: faster decoder than libmad
by jens-lippmann＠t-online.de 02 Jan '05

02 Jan '05

Hello all! I'm looking for a MP3 decoding lib faster than libmad, probably solely written in Intel assembler. I currently use libmad 0.15.1b to stream MP3 files into WAV sound buffers and I need to improve the performance. The mere task of streaming a single audio file saps about 11 milliseconds (@1.8GHz). libmad uses inline and asm here and there, but the costliest parts (frame decoding and synthing) are written in C, optimized for speed but still C. So, my question is if there's anything freely available that decodes faster than libmad? kind regards Jens Lippmann

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