mad-dev December 2002

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how to get time when play a mp3 using libmad
by Zhiwen Yang 31 Dec '02

31 Dec '02

who can tell me how to get the time when i play a mp3 file using libmad ? which function can i use ?

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Merry Christmas & a Query ;-)
by kaiwei 20 Dec '02

20 Dec '02

Hiya, I'm not sure if you guys have been reading the hydrogen audio forums but there's currently a promising player in dev call foobar2000. it's by Peter, of winamp's directsound output fame. Anyway, he just released an SDK http://foobar2000.hydrogenaudio.org/ would it be difficult to port MAD over to it? kaiwei

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Mad winamp plugin bug
by Robert K Marlton 14 Dec '02

14 Dec '02

Sorry to post twice in a row, but I've now got a more specific question. I've been looking at the mad winamp plugin source code, and I've worked out what causes the bug. When winamp tells the plugin to seek it basically calculates a file position to seek to by doing:- (seekpos / song length) * (filelength). This works with CBR files but not with VBR files as they have different data rates throughout the files. I assume that the mad library seeks correctly and I would like to be able to use it to do the seeking with the winamp plugin (as my alternative would be to cludge it by reading frames from the beginning of the file until I got to the right time). Any pointers on what functions I could use in the library?

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Mad winamp plugin bug
by Robert K Marlton 12 Dec '02

12 Dec '02

The mad plugin for winamp stops reporting the correct time after seeking in a VBR file. The time reported is normally about a couple of seconds too low (that is if you have lyrics playing along to the music, the lyrics are shown before they are played). Has anybody got any idea what might be causing this problem or know of a quick and dirty fix I can do to the mad winamp plugin source to fix it? The problem only occurs after a certain amount in to the file (and if you seek before this point, it's still in sync, seeking afterwards though it starts reporting wrong times again). It occurs regardless of the setting of fast playing time in the plugin configuration, regardless of whether xing or lame was used to encode the file and regardless of if the file contains a VBR header. If anybody wants to try and fix this, I can send them a sample lyrics file and a sample mp3 to test it against.

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mad chokes on a mp3
by Bartosch Pixa 06 Dec '02

06 Dec '02

Hi i have a mp3 that isn't playable with madplay but other players play it just fine, it's on gstreamer.net/media/11_-_Melodie.mp3. here's the madplay output: $ madplay music/Noir\ OST\ VICL-60737\ \[320\ kbps\]/11\ -\ Melodie.mp3 MPEG Audio Decoder 0.14.2 (beta) - Copyright (C) 2000-2001 Robert Leslie Title: Melodie Album: NOIR OST1 Track: 11 error: frame 0: CRC check failed error: frame 2: forbidden bit allocation value error: frame 3: CRC check failed error: frame 5: CRC check failed error: frame 6: forbidden bit allocation value error: frame 7: CRC check failed error: frame 8: CRC check failed error: frame 9: forbidden bit allocation value error: frame 10: forbidden bit allocation value error: frame 11: forbidden bit allocation value error: frame 12: forbidden bit allocation value error: frame 13: forbidden bit allocation value error: frame 15: forbidden bit allocation value error: frame 16: CRC check failed error: frame 18: CRC check failed error: frame 19: CRC check failed output: no channel selected for dual channel; using first error: frame 20: CRC check failed error: frame 21: CRC check failed error: frame 22: CRC check failed error: frame 23: forbidden bit allocation value error: frame 24: bad big_values count error: frame 25: forbidden bit allocation value error: frame 26: CRC check failed error: frame 27: CRC check failed error: frame 28: CRC check failed error: frame 29: forbidden bit allocation value error: frame 30: lost synchronization error: frame 31: forbidden bit allocation value error: frame 32: forbidden bit allocation value error: frame 33: CRC check failed error: frame 34: CRC check failed error: frame 35: bad scalefactor index error: frame 36: forbidden bit allocation value error: frame 37: forbidden bit allocation value error: frame 38: CRC check failed error: frame 39: CRC check failed error: frame 40: CRC check failed error: frame 41: CRC check failed error: frame 42: CRC check failed error: frame 43: CRC check failed error: frame 44: CRC check failed error: frame 45: forbidden bit allocation value error: frame 46: forbidden bit allocation value error: frame 47: forbidden bit allocation value error: frame 48: forbidden bit allocation value error: frame 49: forbidden bit allocation value error: frame 50: forbidden bit allocation value error: frame 51: forbidden bit allocation value error: frame 52: forbidden bit allocation value error: frame 53: forbidden bit allocation value error: frame 54: lost synchronization error: frame 55: CRC check failed error: frame 56: forbidden bit allocation value error: frame 57: bad scalefactor index and so on... if you guys need more info just let me know :)

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(no subject)
by dellario＠attbi.com 04 Dec '02

04 Dec '02

I need MAD to decode in chunks, with an arbitrary amount of time between the decoding of each chunk (e.g. I decode the first 50000 samples and then a second later I decode the next 50000 samples), and I'm running into the problem of MAD losing syncronization as I begin to decode each chunk, resulting in the loss of several frames each time. Can anybody help me?

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mad-dev December 2002