mad-dev

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682 discussions

MAD-polyphase filterbank synthesis
by Nelly.TOURNIER＠wavecom.fr 09 Sep '02

09 Sep '02

I don't really understand what does the mad_fixed_t filter[2][2][2][16][8] mean? What does each field exactly correspond to? What is the phase? Is it the subband number? And I can't see how the matrixing is made, with all the variables used, in the dct_32 function. Sincerely, Nelly

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Need help with MAD Synthesis Polyphase Filterbank
by Nelly.TOURNIER＠wavecom.fr 03 Sep '02

03 Sep '02

I am now working on the MAD MP3 decoder, and I can't understand the polyphase synthesis filterbank... Does anyone have some info please? Thanks, Nelly

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tremor relicensed as BSD (fwd)
by Nicolas Pitre 03 Sep '02

03 Sep '02

I thought this announcement could be of some interest to people here too. ---------- Forwarded message ---------- Date: Tue, 3 Sep 2002 14:24:48 +0100 From: rillian <rillian(a)telus.net> Reply-To: vorbis-dev(a)xiph.org To: vorbis-dev(a)xiph.org Subject: [vorbis-dev] tremor relicensed as BSD For those of you not of the commit mailing list, I wanted to point out that monty has checked the fixed-point 'tremor' vorbis decoder into xiph.org cvs, under the usual (free) xiph license. This was developed for use in embedded devices, so if you've been waiting for an interger-only (no fpu) implementation, you might want to give it a try. The code is in the 'Tremor' cvs module. As usual, nightly snapshots are available at http://xiph.org/ogg/vorbis/download/. There's also a new mailing list 'tremor(a)xiph.org'.

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bug of show_status ?
by Zhiwen Yang 03 Sep '02

03 Sep '02

Is there anyone who knows why the static show_status function ? i changed this function to a global function and call it. I find the time in this function is right,such as the current time ,but i can not get it outside this function ? anyone knows this ?

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how to get total time when play a mp3 using libmad
by Zhiwen Yang 02 Sep '02

02 Sep '02

Hi,everyone Is there a function that we can use to get a total time when we play a mp3 file using libmad. i printf the stats->total_time ,it is always zero ? Is there something wrong? Thanks

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Re: mad-dev digest, Vol 1 #200 - 1 msg
by armin.gerritsen＠philips.com 29 Aug '02

29 Aug '02

> transmitter to a receiver. The present invention is distinguished by that > from the frequency coefficients of earlier and, if need be, future blocks, > a decision function is formed, on the basis of which the occurrence of an > error is determined, and that the frequency coefficient containing an > error is not longer utilized for the evaluation of subsequent blocks. Another insane pattent. Basicly this means that if you use any freqcuency coefficient to detect an error in coefficients in following blocks, you're screwed ... Of course you need to compare coefficients ... At least, I see no way to do proper error-correction in this area any other way. That they ever allowed such a pattent ... Armin

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mp3 decoder patent licensing
by Joe Drew 28 Aug '02

28 Aug '02

So, Fraunhofer et al have decided to charge $0.75 per mp3 decoder. I am not positive on how this affects users of MAD, but I have a feeling that given the choice they would go after both people like me (users of MAD) and people like Rob (developers of mp3 decoders.) Rob, I sure hope the potentially forthcoming ogg decoder is similar to MAD's current interface. Maybe MAD could be Multi-format Audio Decoder? It'd be nice to have pluggable support in mpg321 for both codecs. -- Joe Drew <hoserhead(a)woot.net> <drew(a)debian.org> "This particular group of cats is mostly self-herding." -- Bdale Garbee

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Development access
by Neil Hodge 20 Aug '02

20 Aug '02

Rob: Where can one get the latest sources? I noticed that you have FTP and a Sourceforge mirror set up, but I would assume these are not the latest (i.e., daily) development sources. Let me know. Thanks. -- Neil Hodge neh(a)attbi.com

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Still waiting for help from Rob
by Kshitiz Malik 05 Aug '02

05 Aug '02

This is with reference to the mail I wrote a few days back, asking whether the first 9 bits of an mp3 file represent main_data_begin or main_data_end. Can somebody help me? Rob? __________________________________________________ Do You Yahoo!? Yahoo! Health - Feel better, live better http://health.yahoo.com

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skipping frames
by ajoshi＠kernel.crashing.org 30 Jul '02

30 Jul '02

Hi, I was wondering if there was anything in the current libmad API for frame skipping? For example, skipping ahead 1,2, or 4 frames and same for rewind. I understand I can do this directly on my stream but then what would be a clean way to update the mad_stream, and does it need updating? Or can I just call mad_stream_buffer() and it'll figure things out itself? I checked the list archives but couldn't find exactly what I needed, sorry if this question is redudant, as I'm sure it is. Thanks, ani

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