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about the compliance test result on libmad ( ver 0.14.2b) -2
by pltsai＠globalunichip.com 15 Oct '02

15 Oct '02

<he_mode.hex>:261504 samples line 11701: f1e918 000129 f182e7 000156 f11ebb 000189 f0bf59 0001c0 <he_mode_intel.hex> : 147456 samples line 11701: 123809 1269A2 129421 12B5B7 12CEBB 12E192 12F092 12FD3E <he_mode_arm.hex> : 147456 samples line 11701 123809 1269A2 129420 12B5B7 12CEBB 12E191 12F092 12FD3E Hi, everyone, Sorry that hex files are too large for mail. So I quote a section of the he_mode.hex ( l3dec.exe generate) and he_mode_intel.hex , he_mode_arm.hex (mad v.0.14.2b generate) Best Regards, Pei-Lin Tsai

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Bug in libid3tag
by Mark Malson 11 Oct '02

11 Oct '02

I have found that the function id3_render_paddedstring will crash if you are rendering a string that is longer (or exactly as long as) the length parameter you give it. Basically, length would be decremented to zero in the first loop and by the time it got to the second loop it wrapped around back to 0xFFFFFFFF. It is unsigned so a <=0 comparison won't help. I have changed two lines (marked below). Rob, if I read your code correctly I'm guessing you have somewhat of an antipathy toward "for" loops, so adapt as you see fit. - Mark Malson id3_length_t id3_render_paddedstring(id3_byte_t **ptr, id3_ucs4_t const *ucs4, id3_length_t length) { id3_ucs4_t padded[31], *data; int i; /* latin1 encoding only (this is used for ID3v1 fields) */ assert(length <= 30); data = padded; if (ucs4) { /* ** This line used to read: ** while (*ucs4 && length--) { */ for (i=0; (i<length) && *ucs4; i++) { *data++ = *ucs4++; if (data[-1] == '\n') data[-1] = ' '; } } /* ** This line used to read: ** while (length--) */ for ( ; i<length; i++) *data++ = ' '; *data = 0; return id3_latin1_serialize(ptr, padded, 0); }

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Mac OS9 / CodeWarrior
by pmisteli 10 Oct '02

10 Oct '02

Hello, I have yet to find a MacOs9 player that uses mad. I found the latest Audacity but it sounds funny on my OS9 iMac. So I made my own MacOS9/Mad/iMAc player. It occurred to me that other people might be interested so I packaged libmad as a stand-alone CodeWarrior project, but have no idea how to release it, if anyone is indeed interested. The following describes what is currently packaged in a 240kb file libmadmac9.sit : /*************************************************************************** ** * README libmadmac9 * * libmad for Mac OS9 compiled with CodeWarrior * * Copyright (C) 2002 pmisteli * * This program is free software. you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation@ either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY, without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program@ if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * **************************************************************************** */ /* This is a CodeWarrior 5 project to generate libmadmac9.lib, a library for linking libmad with Mac OS9 apps built with CodeWarrior. It includes the libmad directory from the SourgeForge mad-0.14.2b release. Only two files from the SourgeForge release were slightly modified : - huffman.h - layer3.c The originals of these two files are included as huffmanORIG.h layer3ORIG.c. File libmadmac9Prefix.h specifies the FPM_64BIT build for libmad. This is just my way of building libmad with the compiler I have so that it works on my MacOS 9.1 iMac, and has not been tested with other compilers/machines. 8 October 02 - better late than never pmisteli(a)terpalum.umd.edu */

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Updating tags in memory
by Mark Malson 08 Oct '02

08 Oct '02

I wrote this function (in Objective-C) to update the contents of a tag for writing out later. Am I on the right track? Do I need to update both the UTF8 and the latin strings? bool libid3tag_SetString (struct id3_tag const *tag, char const *id, NSString *newStr) { bool retVal = NO; struct id3_frame const *frame; id3_latin1_t *latin1; id3_utf8_t *utf8; /* text information */ union id3_field const *field; unsigned int nstrings, j; extern id3_ucs4_t *id3_utf8_deserialize(id3_byte_t const **ptr, id3_length_t length); if ((frame = id3_tag_findframe(tag, id, 0)) == nil) return NO; field = &frame->fields[1]; nstrings = id3_field_getnstrings(field); for (j = 0; j < nstrings; ++j) { id3_byte_t *ptr; id3_ucs4_t *ucs4; switch (field->type) { case ID3_FIELD_TYPE_STRINGLIST: ptr = [ newStr UTF8String ]; ucs4 = id3_utf8_deserialize (&ptr, [ newStr length ]); id3_field_setstrings (field, 1, &ucs4); free (ucs4); break; case ID3_FIELD_TYPE_LATIN1LIST: ptr = [ newStr cString ]; ucs4 = id3_latin1_deserialize (&ptr, [ newStr length ]); id3_field_setstrings (field, 1, &ucs4); free (ucs4); break; } } return YES; }

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tag options
by Mark Malson 08 Oct '02

08 Oct '02

In writing out tags to a file I had trouble reading them back in using iTunes. I'm not EXACTLY sure why, but when I compared the id3v2.4 tags that iTunes generates vs. libid3tag, I found that libid3tag defaults to always using an extended tag header and writing out a CRC for each tag?? I'm not exactly sure what I'm talking about because I can't get to id3.org to get the latest spec, but that's another story. To fix it, I had to comment out everything in the "tag->options = " line in id3_tag_new, i.e., zeroing out the compression and CRC options. This prevented the extended header from being generated and it prevented the longer header from being generated on each tag. However, I know I'm disabling something that could be useful. Does anyone have any insight into this? I'd rather not flat out disable a feature in this lib.

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Question about ID3v2.4 tags vs. older tags
by Mark Malson 08 Oct '02

08 Oct '02

All right, now for the questions. When libid3tag reads in a TYER tag (and other date/time tags) it coalesces them (at least when writing a v2.4 tag) into a TDRC tag. It appears that iTunes does not read the TDRC tag and prefers TYER, even in v2.4 tags. The comments in libid3tag say that TYER et al. are obsolete, but I'd like to go ahead and write them out anyway. Has anyone encountered this problem and maybe coded a workaround? My initial try was unsuccessful. Also, I would _love_ to read the id3v2.4 spec, (especially regarding TDRC vs. TYER) but www.id3.org has been down for quite some time. Is it gone? Does anyone have the spec that they could email me? Thanks, - Mark Malson

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To parse ID3v2.4
by rahul_dsp 01 Oct '02

01 Oct '02

Hi All, I am new to the list ,I am working on ID3 tags decoding. I want to parse ID3v2.4 tag but facing lots of problems as basic idea of ID3v2.4 is not very much clear. Regarding SEEK Frame can anyone highlight how it works. What I know is that it gives the minimum offset of the next tag from the end of the current tag. This minimum offset is in synchsafe integers of four bytes does that mean that every 8th bit of the byte will be zero as was the case for size of tag and total bits will be 28 instead of 32. Please clear this out. Also I need sample tag of ID3v2.4 and ID3v2.2 or it would be great if someone provide me the link where it is available. regards, Rahul --------------------------------------------- http://mail.indiainfo.com India's first ISO certified portal Check world time at http://time.indiainfo.com

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To parse ID3v2.4
by rahul_dsp 30 Sep '02

30 Sep '02

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madplay frontend design
by Umar Qureshey 24 Sep '02

24 Sep '02

Hi, I would like to create a curses front-end for madplay 0.12.5b (I know it's ancient, I might migrate later to newer versions). My question is where in the code would this reside? Would it be in the main() function in madplay.c or perhaps play() in player.c? Looking at audio_*.c files, it seems that one can pass control commands to start, stop, etc. Any references or suggestions (regardless of madplay version) would be greatly appreciated. Regards, UQ

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Also Need help with MAD Synthesis Polyphase Filterbank
by Jane Zhao 10 Sep '02

10 Sep '02

Hi, Sir, I also need help to understand your polyphase synthesis filterbank algorithm. I looked at your dct32 and synth_full funtions. They are quite different from the synthesis filter algorithm description in 11172-3. Is there any reference paper that descripes your algorithm? Thanks. -Jane On Tuesday, September 3, 2002, at 07:34 AM, Nelly.TOURNIER(a)wavecom.fr wrote: > I am now working on the MAD MP3 decoder, and I can't understand the > polyphase synthesis filterbank... Does anyone have some info please? What would you like to know about it? __________________________________________________ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com

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