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682 discussions

MAD in alsaplayer
by Andy Lo A Foe 16 Sep '01

16 Sep '01

Hi, I've almost completed integration of MAD in alsaplayer (http://www.alsaplayer.org). My thanks go to Rob for the very informative message earlier and of course excellent work on the MAD enigne! I will probably release the first MAD powered version early next week. Sample accurate seeking is in the plugin. The nice thing is that 'scratching' mp3's is now very accurate in alsaplayer (i.e. speed control beteen -200+ and 200+ %). Thanks again, Andy -- andy @ alsaplayer dot org

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Output plugin?
by kaiwei 15 Sep '01

15 Sep '01

Hi, I just got this from MAudio's tech support. About the Website text: it is still somehow misleading: << You will be limited to 16 bit stereo input or output with non ASIO based applications. (Sonar you are able to get 24bit with our WDM drivers) >> The truth is: * apps not supporting WAVEFORMAT_EXTENSIBLE (this is a new wave format spec released by Microsoft 2 years ago) will be limited to 16 bit stereo output. However, in the last few month more and more apps (like SoundForge 5, Acid 3...) do support this, so they're not limited in output bitdepth. * The input side is not limited to 16 bit but to 24 bit in a 4 byte container even with apps not supporting WAVEFORMAT_EXTENSIBLE (try recording '24bit old' with WaveLab3 : no problem). But, since many apps try to open input and output at the same bitdepth, these are only using 16 bit. * apps supporting WAVEFORMAT_EXTENSIBLE or DirectX are not limited to stereo output but to one input/output port of 12/10 channels maximum (Delta1010). Try WinDVD and set output to 5.1 over 6 channels: You will get audio playback on channels 1-6. Would it be better to write our own output plugin in winamp rather than use their own? kaiwei

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CPU bandwidth required for MAD decode..
by john cooper 11 Sep '01

11 Sep '01

Hi, I saw some light mention of this in the archives back over a year ago discussing MAD vs. ARM's decoder. However nothing definitive. I realize this is rather difficult to qualify. However does anyone have any data or estimate of the processing time of a MAD decode where the CPU/speed/architecture are known and stream I/O overhead (read()/mmap()/memory access) is either factored out or characterized? Hoping someone has already beaten this path.. Thanks, -john -- John Cooper johncooper(a)tivo.com

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sample accurate seeking with mad
by Andy Lo A Foe 28 Aug '01

28 Aug '01

Hi, I'm writing a player (http://www.alsaplayer.org) and currently use mpg123 for mp3 decoding purposes. I'm interested in adopting MAD because it is fully reentrant (right?). My question, is there sample accurate seeking possible in MAD? Thanks, Andy

2 1

MAD( Regarding the dynamic jumping to songs different location )
by Sadeesh Kumar 27 Aug '01

27 Aug '01

Hi, Rightnow i am trying to make one mp3 player for Compaq ipaq. For graphics, i am using Embedded Qt. I am using madplayer as mp3 engine. I have some issues in the slider scrolling support( In GUI, i want to provide one slider to jump to any part of the playing song like winamp ...). In libmad, when the song is playing, how can i jump to different differnt location and start to play from that location?. I find it, there is no direct easy interface to do this. If you can give some suggestion to me, it will be very help full. thanks in advance. with regards, sadeesh.

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a high-level API question
by Joshua Haberman 22 Aug '01

22 Aug '01

There was one issue I ran into when implementing MP3 importing support for Audacity that I meant to ask about. It seems that when you pass the decoder data from the input callback, it tries to synthesize everything you give it. If the end of the buffer you passed ends in the middle of a frame, you get seams. Passing all the data to the decoder at once solves the problem, but that's not practical. As far as I can see, you can't get any metainformation (like the size of each frame) until you pass it data. Once you pass it data, you've probably misaligned the frame and produced garbage. What's the proper way to handle this situation? Joshua -- Joshua Haberman <joshua(a)haberman.com>

2 3

porting to VC++
by Joshua Haberman 22 Aug '01

22 Aug '01

Rob, I sent you an e-mail several weeks ago and have not heard back. Perhaps you didn't get it or deleted it, thinking it was spam. I've ported libmad to Visual C++ (with the intention of also having the port extend to the Mac) so that we can use mad in the cross-platform editor Audacity [0]. I've gotten it to compile, but I get several warnings, and I hoped you could tell me if they're important. I also hoped you might integrate the port into future releases of mad. The original message I sent you, which details the problems encountered and my solutions to them as well as the compiler warnings I got, can be found in the Audacity mailing list archive [1]. You can also find the port in Audacity's CVS [2]. Joshua [0] http://audacity.sourceforge.net [1] http://www.geocrawler.com/lists/3/SourceForge/11785/25/6377206/ [2] http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/audacity/lib-src/libmad/ -- Joshua Haberman <joshua(a)haberman.com>

2 1

libmad : example?
by mandor 08 Aug '01

08 Aug '01

Hi I'm planning to code a full-featured mp3 player and libmad seems great for this .. However, I didn't find much doc about using it... I want to be able to seek in the song : forward/rewind, etc ... How can I do this with libmad? Is there an example somewhere? Thx Mandor

1 0

Announce: elmpd v0.2
by Erik Gustavsson 30 Jul '01

30 Jul '01

I've just released the second version of elmpd, a media player "daemon" that is part of the ELMP:TNG project (Embedded Linux MP3/Music/Media Player). It uses MAD for MP3 decoding, and has optional dither on the output (HP TPDF with 2nd order noise shaping, I hope =) ). There is currently no client (i.e. UI) for elmpd, but you can try it out using telnet. http://elmp-tng.sourceforge.net/

1 0

mpg321 0.1.0 released
by Joe Drew 16 Jul '01

16 Jul '01

I've just released mpg321 0.1.0, the port of mpg321 to mad. For those who don't know, mpg321 is my free implementation of mpg123, a popular command-line mpeg audio decoder. It is available as a Debian package in the unstable tree; version 0.1.0 will be available from the apt repositories tomorrow after the dinstall run. I ask that those who aren't running Debian download mpg321 from http://gemini.woot.net/~hosehead/packages/mpg321_0.1.0.tar.gz (please note you'll also need libao for audio output - see the README) and test it out. There are certain features which need to be tested and discrepancies pointed out, so I can fix them (like the network support), and I'd also like to see if any frontends break with this version. Thanks, -- Joe Drew <hoserhead(a)woot.net> <drew(a)debian.org> Please encrypt email sent to me.

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