history.html

音频编码

  <li> Christopher Wise:&nbsp; A makefile for DJGPP, the DOS version of gcc.&nbsp; 
    Now most windows users should be able to compile LAME with minimal effort.</li>
  <li> <font color="#ff0000">Robert Hegemann:&nbsp; old VBR:&nbsp;&nbsp; fixed 
    some bugs and Takehiro's scalefac_scale feature (not yet on by&nbsp; default.)&nbsp; 
    older LAME versions did not allow to spent more than 2500 bits of 4095 possible 
    bits to a granule per channel, now fixed.</font></li>
  <li> Robert Hegemann:&nbsp; new VBR:&nbsp;&nbsp; analog silence treatment like 
    in old VBR</li>
  <li> William Welch:&nbsp; Improved options for Linux/Alpha gcc and ccc compilers 
    in Makefile.</li>
  <li> Mathew Hendry:&nbsp; setting appropriate CRC bit for additional Xing-VBR 
    tagging frame</li>
  <li> Don Melton:&nbsp; added ID3 version 2 TAG support</li>
  <li> <font color="#000000">John Dahlstrom: fixed bug allowing timing information 
    (for status in command line encoder) to overflow.</font></li>
  <li> <font color="#000000">Tamito KAJIYAMA, Fixed several bugs in the LAME/Vorbis 
    interface.</font></li>
  <li> <font color="#000000">Mark Taylor:&nbsp; lame --decode will recognize <a href="http://albumid.cjb.net">Album 
    ID tags</a></font></li>
  <li> <font color="#ff0000">Naoki Shibata:&nbsp; Additive masking and other improvements 
    to psycho acoustics.&nbsp; (not yet on by default)</font></li>
</ul>
<h3> LAME 3.85beta&nbsp;&nbsp; July 3 2000</h3>
<ul>
  <li> <font color="#ff0000">Takehiro Tominaga:&nbsp; mid/side stereo demasking 
    thresholds updated.</font></li>
  <li> Takehiro Tominaga: New short block MDCT coefficient data structure.&nbsp; 
    Should allow for future speed improvements.</li>
  <li> Robert Hegemann:&nbsp; fixed bug in old VBR routine, the --noath mode messed 
    up the VBR routine resulting in very large files</li>
  <li> Robert Hegemann: found bugs in some sections when using 32 bit floating 
    point.&nbsp; Default is now back to 64bit floating point.</li>
  <li> <font color="#ff0000">Takehiro Tominaga:&nbsp; Modified PE formula to use 
    ATH.</font></li>
  <li> <font color="#000000">S.T.L.:&nbsp; README.DJGPP - instructions for compiling 
    LAME with DJGPP, the dos version of gcc.</font></li>
</ul>
<h3> LAME 3.84beta&nbsp; June 30&nbsp; 2000</h3>
<ul>
  <li> Mark Weinstein:&nbsp; .wav file output (with --decode option) was writing 
    the wrong filesize in the .wav file.&nbsp; Now fixed.</li>
  <li> Mark Taylor:&nbsp; (optional) Vorbis support, both encoding and decoding.&nbsp; 
    LAME can now produce .ogg files, or even re-encode your entire .ogg collection 
    into mp3.&nbsp;&nbsp; (Just kidding: it is always a bad idea to convert from 
    one lossy format to another)</li>
  <li> ?: Bug fixed causing VBR to crash under windows.&nbsp;&nbsp; (pretab[] 
    array overflow)</li>
  <li> Sergey Sapelin: Another bug found in the mpg123 MPEG2 tables.&nbsp; Now 
    fixed for the mpg123 based decoder in LAME.</li>
  <li> Marco Remondini:&nbsp; VBR histogram works in win32.&nbsp; compile with 
    -DBRHIST -DNOTERMCAP</li>
  <li> <font color="#ff0000">Takehiro Tominaga:&nbsp; LAME CBR will now use scalefac_scale 
    to expand the dynamic range of the scalefactors.</font></li>
  <li> <font color="#000000">Iwasa Kazmi:&nbsp; Library improvements:&nbsp; exit()'s, 
    printf, fprintf's are being replaced by interceptable macros.</font></li>
</ul>
<h3> LAME 3.83beta&nbsp; May 19&nbsp; 2000</h3>
<ul>
  <li> <font color="#ff0000">Mark Taylor:&nbsp; Bug in buffering routines:&nbsp; 
    in some cases, could cause MDCT&nbsp; to read past end of buffer.&nbsp; Rare 
    in MPEG2, even more rare for MPEG1, but potentially serious!</font></li>
  <li> Mark Taylor:&nbsp; MDCT/polyphase filterbank was not being "primed" properly.&nbsp; 
    Does not effect output unless you set the encoder delay lower than the default 
    of 576 samples.</li>
  <li> <font color="#ff0000">Mark Taylor:&nbsp; "vdbj" and "Caster"&nbsp; found 
    several VBR bugs (now fixed):&nbsp;&nbsp; 1.&nbsp; Analog silence detection 
    only checked frequencies up to 16 kHz.&nbsp; 2.&nbsp; VBR mode could still 
    somehow avoid -F mode.&nbsp; 3.&nbsp; VBR mode would ignore noise above 16 
    kHz (scalefactor band 22), Now calc_noise1 will compute the noise in this 
    band when in VBR mode.&nbsp; Not calculated in CBR&nbsp; mode since CBR algorithm 
    has no way of using this information.</font></li>
  <li> Mark Taylor:&nbsp; scalefactor band 22 info (masking(=ATH),&nbsp; noise 
    and energy) now displayed in frame analyzer.</li>
  <li> <font color="#ff0000">VBR code ATH tuning was disabled by accident in 3.81, 
    now fixed.</font></li>
  <li> <font color="#000000">Mark Taylor:&nbsp; lame --decode will produce .wav 
    files.&nbsp; (oops - size is off by a factor of 4)</font></li>
</ul>
<h3> LAME 3.82beta&nbsp;&nbsp; May 11 2000</h3>
<ul>
  <li> Robert Hegemann:&nbsp; Fixed bug in high bitrate joint stereo encodings.</li>
  <li> <font color="#3366ff">Naoki Shibata:&nbsp; new long block MDCT routine</font></li>
</ul>
<h3> LAME 3.81beta&nbsp; May 8 2000</h3>
<ul>
  <li> all ISO code removed!</li>
  <li> <font color="#3366ff">Takehiro Tominaga and Naoki Shibata:&nbsp; new window 
    subband routines.</font></li>
  <li> <font color="#000000">Naoki Shibata:&nbsp; Bug fix in mpglib (decoding) 
    lib:&nbsp; in some cases, MDCT coefficients from previous granule was incorrectly 
    used for the next granule.</font></li>
  <li> <font color="#ff0000">ISO 7680 bit buffer limitation removed.&nbsp; It 
    can be reactivated with "--strictly-enforce-ISO"&nbsp; Please report any trouble 
    with high bitrates.</font></li>
</ul>
<h3> LAME 3.80beta&nbsp; May 6 2000</h3>
<ul>
  <li> <font color="#ff0000">Takehiro Tominaga:&nbsp; more efficient and faster 
    huffman encoding!</font></li>
  <li> <font color="#ff0000">Takehiro Tominaga and Mark Taylor:&nbsp; much improved 
    short block compression!</font></li>
  <li> <font color="#000000">Tomasz Motylewski and Mark Taylor:&nbsp; MPEG2.5 
    now supported!</font></li>
  <li> <font color="#000000">Mark Taylor: incorporated Takehiro's bitstream.c!&nbsp; 
    bitstream.c used by default, but old ISO bitstream code can also be used.</font></li>
  <li> <font color="#ff0000">Scott&nbsp; Manley and Mark Taylor:&nbsp; good resampling 
    routine finaly in LAME.&nbsp; uses a 19 point FIR filter with Blackman window.&nbsp; 
    Very slow for non integer resampling ratios.</font></li>
  <li> <font color="#000000">Iwasa Kazmi:&nbsp; fixed SIGBUS error:&nbsp; VBR 
    and id3 tags were using data after it was free()'d.</font></li>
  <li> <font color="#ff0000">Robert Hegemann:&nbsp; Improved VBR tuning.&nbsp; 
    #define RH_QUALITY_CONTROL and #RH_SIDE_VBR now the defaults.</font></li>
  <li> <font color="#000000">Robert Hegemann:&nbsp;&nbsp; LAME version string 
    now added to ancillary data.</font></li>
  <li> Kimmo Mustonen:&nbsp; VBR histogram support for Amiga.</li>
  <li> Casper Gripenberg:&nbsp; VBR stats (but not histogram) for DOS verson.</li>
  <li> Robert Hegemann:&nbsp; rare VBR overflow bug fixed.</li>
  <li> Zack:&nbsp; -F option strictly enforces the VBR min bitrate.&nbsp; Without 
    -F, LAME will ignore the minimum bitrate when encoding analog silence.</li>
  <li> Shawn Riley:&nbsp; User can now specify a compression ratio (--comp &lt;arg&gt;) 
    instead of a bit rate.&nbsp; Default settings based on a compression ratio 
    of 11.0</li>
  <li> Mark Taylor:&nbsp; free format bitstreams can be created with --freeformat, 
    and specify any integer bitrate from 8 to 320kbs with -b.</li>
  <li> Mark Taylor: lame be used as a decoder (output raw pcm only):&nbsp; lame 
    --decode input.mp3 output.pcm</li>
</ul>
<h3> LAME 3.70&nbsp;&nbsp; April 6 2000</h3>
<ul>
  <li> "LAME 3.69beta" becomes LAME 3.70 "stable"</li>
</ul>
<h3> LAME 3.69beta&nbsp;&nbsp; April 6 2000</h3>
<ul>
  <li> "spahm":&nbsp; default mode selection bug fixed.&nbsp; In some cases, lame 
    was defaulting to regular stereo instead of jstereo when the user did not 
    specify a mode.</li>
</ul>
<h3> LAME 3.68beta&nbsp; April 4 2000</h3>
<ul>
  <li> Mark Taylor: mono encoding bug in DLL fixed.</li>
  <li> Ingo Saitz: bug in --cwlimit argument parsing fixed.</li>
  <li> <font color="#ff0000">Scott Manly: bug in 4-point resample code fixed.</font></li>
</ul>
<h3> LAME 3.67beta&nbsp; March 27 2000</h3>
<ul>
  <li> <font color="#ff0000">Robert Hegemann:&nbsp; jstereo now enabled for MPEG2 
    encodings</font></li>
  <li> Mark Taylor: old M/S stereo mode which used L/R maskings has been removed.</li>
  <li> Mark Taylor: Xing MPEG2 VBR headers now working.</li>
  <li> <font color="#ff0000">Mark Taylor:&nbsp; When quantized coefficients are 
    all 0 in a band, set scalefactors to 0 also to save a few bits.</font></li>
  <li> <font color="#000000">Ingo Saitz:&nbsp; Problems with framesize calculation 
    when using -f fast-math option fixed.</font></li>
</ul>
<h3> LAME 3.66beta March 21 2000</h3>
<ul>
  <li> Bug fixes in BladeEnc DLL, possible click in last mp3 frame, VBR historgram 
    display, byteswapping option, ASM quantize routines work for both float and 
    double.</li>
</ul>
<h3> LAME 3.65beta&nbsp;&nbsp; March 17 2000</h3>
<ul>
  <li> Enabled ASM version of quantize_xrpow() - accidently disabled in lame3.64.</li>
</ul>
<h3> LAME 3.64beta&nbsp; March 16 2000</h3>
<ul>
  <li> Don Melton:&nbsp; id3v1.1 tags &amp; id3 bugfixes</li>
  <li> <font color="#ff0000">Gabriel Bouvigne:&nbsp; L/R matching block type fix</font></li>
  <li> <font color="#ff0000">Bug fixed which was allowing quantized values to 
    exceed the maximum when not using -h</font></li>
  <li> <font color="#3366ff">Mark Taylor: Fitlers based on polyphase filterbank.&nbsp; 
    should be slightly better since the responce is independent of the blocktype, 
    and they are slightly faster.</font></li>
  <li> Mark Taylor: API:&nbsp; the API changed slightly - and this should be the 
    final version. There is a new routine: lame_encode_buffer() which takes an 
    arbritray sized input buffer, resamples &amp; filters if necessary, encodes, 
    and returns the mp3buffer.&nbsp; There are also several new #defines, so it 
    is possible to compile a simple encoding library with no decoding or file 
    I/O or command line parsing.&nbsp; see the file API for details.</li>
  <li> Mark Taylor: MSVC stuff:&nbsp; lame.exe (with and without the frame analyzer) 
    and the CDex lame_enc.dll</li>
  <br>
  should compile under MSVC.&nbsp; The MSVC5 project files may need some tweaking.&nbsp; 
  In particular, <br>
  you need to make sure LAMEPARSE, LAMESNDFILE and HAVEMPGLIB <br>
  are defined.&nbsp; (and HAVEGTK for the GTK stuff). 
</ul>
<h3> LAME 3.63beta&nbsp; February 20&nbsp; 2000</h3>
<ul>
  <li> Robert Hegemann:&nbsp; FPE with -h fixed?</li>
  <li> Mathey Hendry:&nbsp; FPE error catching for Cygwin, FPE fix for vbr mode 
    and output to /dev/null</li>
  <li> Jeremy Hall:&nbsp; Fixed problems with input files where the number of 
    samples is not known.</li>
  <li> <font color="#3366ff">Mathew Hendry:&nbsp; ASM quantize_xrpow() for GNU 
    i386</font></li>
  <li> <font color="#3366ff">Wilfried Behne&nbsp; quantize_xrpow ()for PowerPC 
    and non-ASM</font></li>
  <li> <font color="#3366ff">Takehiro Tominaga:&nbsp; GOGO FFTs&nbsp; (not yet 
    used?)</font></li>
  <br>
  &nbsp; 
</ul>
<h3> LAME 3.62beta&nbsp;&nbsp; February 9 2000</h3>
<ul>
  <li> <font color="#000000">Iwasa Kazmi:&nbsp; frame analyzer short block display 
    of single subblocks (press 1,2&nbsp; or 3)</font></li>
  <li> <font color="#000000">Ingo Saitz:&nbsp; --help option added, with output 
    to stdout</font></li>
  <li> <font color="#ff0000">Alfred Weyers: short block AAC spreading function 
    bug fixed</font></li>
  <li> <font color="#3366ff">Takehiro Tominaga:&nbsp; new scalefac data structure 
    - improves performance!</font></li>
  <li> <font color="#ff0000">Lionel Bonnet:&nbsp; Bug fixed in MPEG2 scalefactor 
    routine: scalefactors were being severly limited.</font></li>
  <li> <font color="#3366ff">Takehiro Tominaga:&nbsp; faster FFT routines from.&nbsp; 
    These routines are also compatible with the GOGO routines, in case someone 
    is interested in porting them back to LAME.</font></li>
  <li> <font color="#3366ff">Sigbj&oslash;rn Skj&aelig;ret, Takehiro Tominaga:&nbsp; 
    faster pow() code.</font></li>
  <li> <font color="#ff0000">Joachim Kuebart:&nbsp; Found some unitialized variables 
    that were effecting quality for encodings which did not use the -h option 
    (now fixed).</font></li>
  <li> Mark Taylor: More modularization work.&nbsp;&nbsp; It is now possible to 
    use LAME as a library where you can set the encoding parameters directly and 
    do your own file i/o.&nbsp;&nbsp; The calling program is now it's own mp3 
    output.&nbsp; For an example of the LAME API, see main.c, or mp3rtp.c or mp3x.c.&nbsp; 
    These can all be compiled as stand alone programs which link with libmp3lame.a.</li>
  <li> Felix vos Leitner:&nbsp; mp3rtp fixes.&nbsp; mp3rtp is a standalone program 
    which will encode and stream with RTP.</li>
  <li> Robert Hegemann:&nbsp; Information written to stderr displaying exactly 
    which type of lowpass filter (if any) is being used.</li>
  <li> Iwasa Kazmi:&nbsp; mpglib (the mpg123 decoder) scsfi decoding fixes.</li>
  <li> Takehiro Tominaga:&nbsp; More mpglib scsfi decoding fixes.</li>
</ul>
<h3> LAME 3.61beta&nbsp; January 14 2000</h3>
<ul>
  <li> <font color="#ff0000">Mark Taylor: Fixed bug with lowpass filters when 
    using VBR with a 64kbs or lower min bitrate setting.</font></li>
  <li> <font color="#ff0000">Takehiro Tominaga:&nbsp; more efficient huffman encoding 
    splitting.</font></li>
</ul>
<h3> LAME 3.60beta&nbsp;&nbsp; January 9 2000</h3>
<ul>
  <li> Mark Taylor: Distribution now comes with self test.&nbsp; Needs work to 
    be automated, see 'make test' in Makefile.</li>
  <li> <font color="#ff0000">Mark Taylor: AAC spreading function now the default</font></li>
  <li> Gabriel Bouvigne: updated HTML docs</li>
  <li> Felix von Leitner: compute correct file length from Xing header (if present) 
    when input file is a mp3 file</li>
  <li> Felix von Leitner: mp3rtp (standalone) program now included.&nbsp; Not 
    yet tested.&nbsp; mp3rtp ip:port:ttl&nbsp; &lt;infile&gt;&nbsp;&nbsp; /dev/null 
    will stream directly to ip:port using&nbsp; RTP.</li>
  <br>
  &nbsp; 
</ul>