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292 discussions

20 bit playback and DSP plugins
by Unorthodox Behaviour 16 Apr '02

16 Apr '02

Greetings to Rob and the list! I've been lurking for a while but now I'd like some advice. For the lack of money for a 24/96 card, I just bought a Hercules (ex Guillemot) Game Theatre XP 6.1 card, which features the Crystal CS4630 DSP with 18-bit ADC and 20-bit DAC. (It's the same chip as the Videologic Sonic Fury, and the Turtle Beach Santacruz) Using Mad I can listen to music when I set Mad's resolution in both 24 and 32 bits, when the output plugin is either wave out (Winamp critical update installed). With the directx output plug, I get white noise in both 24 and 32 bits. Question 1 is: Is there a way to certify that the resulting sound is taking advantage of the 20 bit resolution of the card and that it's not just a dithered to 16 bits sound ? (provided of course that the card's drivers do actually support these 20 bits of the ADC...) Question 2 is: Does anybody know of any DSP music enhancer Winamp plug that would support more than 16 bits ? The ones I tried did not work. I know some of you have 24/96 cards and so I expect you might use DSP plugins. Thanks in advance for any tips! By the way, and for your information, Terratec will soon produce a new budget card, the DMX 6fire LT priced below 150 euros. It's a full 5.1 channel 24/96 card (all channels being 5.1) with the same specs as the existing 6fire but without the breakout box - a definite best buy. Amazon.de and computeruniverse.com already offer it as a preorder. Of course i'm not in any way affiliated to these companies, it's just that this will be my next card - cheaper than any 24/96 stereo channel card, even Terratec's. Needless to say, since the time I left the list some months ago, I have recommended Mad to some 100+ people who use it daily. Moreover, Mad is used some 10 hours per day on my PC... Long live MAD ! __________________________________________________ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/

3 3

rendering using libid3tag
by Dominic Mazzoni 11 Apr '02

11 Apr '02

Hi, In developing Audacity (a cross-platform audio editor), I've continued to have nothing but good experiences with libmad. I recently added support for 24-bit and 32-bit samples in Audacity, and it's great that using libmad I can take advantage of these sample formats. I'd like to also switch over to using libid3tag. We had been using id3lib, but it's buggy and has trouble compiling on a lot of systems. Our needs are minimal. We're not trying to be the ultimate ID3 editor; we just want to be able to read and write the most common tags for convenience. I didn't see any documentation on libid3tag...did I miss something? The sample code only uses a small subset of its features. Anyway, I was able to figure out how to use libid3tag to import tags from a file. But I'm stuck trying to render them using id3_tag_render. 1. First of all, the only way I was able to figure out to add new frames was to muck around in the data structures. Is this correct? It might be nice if there were more API functions to make it easier... For example, id3lib has a "simple API" which provides functions that let you add and/or query the most common tags (Title, Artist, etc.), without mucking in the data structure at all. 2. What's the proper way to convert an ASCII string to an id3_ucs4_t string? (I used a for loop, casting chars to longs...is that OK?) 3. When I try to enable the ID3_TAG_OPTION_ID3V1, the rendering fails. Is it supported? 4. Finally, I do get some bytes back from id3_tag_render without the ID3V1 option, but when I prepend them to the beginning of my MP3 file, programs don't recognize them. In fact even libid3tag doesn't even load any tags from the resulting file. Is there something else I need to do to the id3_tag_render output? I'm including some of my source code below. Thanks for any help anyone can offer. - Dominic struct id3_frame *MakeID3Frame(const char *name, const char *data) { struct id3_frame *frame; union id3_field *field; id3_ucs4_t *ustr; int i; ustr = (id3_ucs4_t *)malloc(sizeof(id3_ucs4_t)*(strlen(data)+1)); for(i=0; i<strlen(data)+1; i++) ustr[i] = (id3_ucs4_t)data[i]; field = (union id3_field *)calloc(1, sizeof(union id3_field)); field->type = ID3_FIELD_TYPE_STRINGLIST; id3_field_setstrings(field, 1, &ustr); frame = (struct id3_frame *)calloc(1, sizeof(struct id3_frame)); strncpy(frame->id, name, 4); frame->nfields = 1; frame->fields = field; return frame; } // returns buffer len; caller frees int Tags::ExportID3(char **buffer, bool *endOfFile) { struct id3_tag *tp; struct id3_frame *frame; tp = id3_tag_new(); id3_tag_attachframe(tp, MakeID3Frame(ID3_FRAME_TITLE, mTitle)); id3_tag_attachframe(tp, MakeID3Frame(ID3_FRAME_ARTIST, mArtist)); id3_tag_attachframe(tp, MakeID3Frame(ID3_FRAME_ALBUM, mAlbum)); if (mID3V2) { tp->options |= ID3_TAG_OPTION_COMPRESSION; *endOfFile = false; } else { tp->options |= ID3_TAG_OPTION_ID3V1; *endOfFile = true; } id3_length_t len; len = id3_tag_render(tp, 0); *buffer = (char *)malloc(len); len = id3_tag_render(tp, (id3_byte_t *)*buffer); id3_tag_delete(tp); return len; }

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Re: mad-user digest, Vol 1 #121 - 2 msgs
by Benjamin Lebsanft 03 Apr '02

03 Apr '02

That's what i meant, sorry for the incorrectness :) > I just think it's the way that the MAD plugin was written is at fault, not MAD > itself. > > Benjamin Lebsanft wrote: > > > But when MAD is enabled vorbis streaming does not work, and if its disabled > > it does. So it must be MAD's fault...

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Re: mad-user digest, Vol 1 #120 - 2 msgs
by Benjamin Lebsanft 02 Apr '02

02 Apr '02

But when MAD is enabled vorbis streaming does not work, and if its disabled it does. So it must be MAD's fault...

2 1

Re: MAD and streaming OGG
by Saboteur 01 Apr '02

01 Apr '02

well this is a different problem though, since I'm not talking about an mp3 stream, MAD --as far as I know-- doesn't decode OGG files so I really don't see the reason why it should interact with the Nullsoft in_vorbis plugin. g. > > that's not new. > > For some reason, MAD for winamp has never worked with streaming > anything. > > Usually, I forget to disable it when I want to listen to some > streaming mp3.... > > Too bad MAD can't just "pass" it on to another plugin if it doesn't > support it. > > G.

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MAD and streaming OGG
by Saboteur 01 Apr '02

01 Apr '02

Hi, I was trying the new OGG streams for BBC1 in winamp 2.78 ( http://support.bbc.co.uk/ogg/ ) and noticed that if MAD is enabled they won't work. I'm not saying it's a MAD problem especially considering the early stage of the vorbis plugins and especially the streaming support. I thought I'd mention it here though since I see no reason why the 2 plugins should interact (and clash). I have the latest versions for both plugins. thanks, g.

2 1

xmms-mad and mad_timer_zero
by John Utz 16 Mar '02

16 Mar '02

hi; this error has been defeating me /usr/local/lib/xmms/Input/libxmmsmad.so: Undefined symbol "mad_timer_zero" its in mad.h as an extern const mad_timer_t i cant find for the life of me where the thing is actually supposed to be resolved! it's obviously not getting resolved or else the loader wouldnt be complaining, right :-) what to do? tnx! johnu -- John L. Utz III john(a)utzweb.net Idiocy is the Impulse Function in the Convolution of Life

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Re: [mad-user] MP3 sampled by 22.05kHz, mono or stero
by weipyy 28 Feb '02

28 Feb '02

> Dear davidlee: You can resample the mp3 form 44.1khz to 22.05khz by mad BRs wei ping > > > > > > > Dear All: > Because I should do same test, I need some > MP3s with 22.05kHz sample frequency stero or mono. But after I got some MP3s, I > found all of them are sampled by 44.1kHz, that's to fast for my poor MP3 > hardware. So I wander if anyone can tell where I can find MP3 sample by 22.05Khz > 16bit mono or stero. I appreciate anyone's help > > > > > > BEST REGARD > > > > > davidlee > > ÀîŽóŒœ > > Email: davidlee(a)gv.com.tw >

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MP3 sampled by 22.05kHz, mono or stero
by davidlee 28 Feb '02

28 Feb '02

Dear All: Because I should do same test, I need some MP3s with 22.05kHz sample frequency stero or mono. But after I got some MP3s, I found all of them are sampled by 44.1kHz, that's to fast for my poor MP3 hardware. So I wander if anyone can tell where I can find MP3 sample by 22.05Khz 16bit mono or stero. I appreciate anyone's help BEST REGARD davidlee 李大冀 Email: davidlee(a)gv.com.tw

2 1

Re: [mad-user] madplay control
by Rob Leslie 26 Feb '02

26 Feb '02

On Tuesday, February 26, 2002, at 01:13 AM, Nicolas DEVERGE wrote: > I'm a newbie using mad and I wish to control madplay through its stdin, > let's > say, I wish to pause, resume or quit madplay by sending a P, Q or else > character in its standard input with another program (maybe through a > socket), so is it possible with madplay ? And how works the tty-control > parameter ? madplay reads keyboard input from its controlling terminal, so to make this work you would need to mess with master and slave PTYs, or use a tool like `expect'. An alternative would be to send signals to the madplay process: SIGSTOP would pause, SIGCONT would resume, and SIGINT would quit. -- Rob Leslie rob(a)mars.org

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