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音频编码

  <li>Alexander Leidinger: fix link problem on systems where socket() resides 
    in libsocket</li>
</ul>
<br>
<h3>LAME 3.93 &nbsp; &nbsp;November 16 2002</h3>
<ul>
  <li>Takehiro Tominaga: 
    <ul>
      <li><font color="#ff0000">bit allocation for pre-echo control improved for 
        single channel encodings</font></li>
      <li><font color="#ff0000">substep noise shaping</font></li>
      <li><font color="#3366ff">optimizations by changing data structure</font></li>
      <li><font color="#ff0000">noise shaping model 2 fix</font></li>
      <li><font color="#3366ff">nspsytune FIR filter clean up</font></li>
      <li><font color="#ff0000">fix small psymodel bugs(DC current estimation, 
        preecho detection of non-VBR mode, and nspsymode initialization)</font></li>
      <li>portability fixes for Tru64 UNIX</li>
    </ul>
  </li>
  <li>Albert Faber: some fixes in the DLL</li>
  <li>Simon Blandford: fixes for channel scaling in mono mode</li>
  <li><font color="#3366ff">Dominique Duvivier: some optimizations and a faster 
    log10 function</font></li>
  <li>Mark Taylor: 
    <ul>
      <li>some tag related fixes in the direct show filter and in the ACM codec</li>
      <li><font color="#3366ff">fixed a mono encoding bug found by Justin Schoeman</font></li>
      <li>calc_noise bug fix</li>
      <li>other fixes</li>
    </ul>
  </li>
  <li>Alexander Leidinger: 
    <ul>
      <li>update to autoconf 2.53, rewrite some configure tests</li>
      <li>Akos Maroy: determine gcc version even with gcc 3.1</li>
      <li>Andrew Bachmann: compile shared libs on BeOS (and perhaps other arches)</li>
      <li>ultrasparc switches for gcc 3.1</li>
      <li>fixes for SunOS 4.x</li>
      <li>fixes for 64bit arches</li>
      <li>CFLAGS fix for IRIX</li>
      <li>don't override CFLAGS if exptopt isn't requested</li>
    </ul>
  </li>
  <li>Robert Hegeman: 
    <ul>
      <li><font color="#3366ff">some fixes</font></li>
      <li><font color="#ff0000">some fixes for VBR</font></li>
    </ul>
  </li>
  <li>Gabriel Bouvigne: 
    <ul>
      <li>--noasm switch. Might help Cyrix/Via users</li>
      <li><font color="#ff0000">presets and alt-presets merged</font></li>
    </ul>
  </li>
</ul>
<br>
<h3>LAME 3.92 &nbsp; &nbsp;April 14 2002</h3>
<ul>
  <li><font color="#ff0000">Alexander Leidinger:&nbsp; add non linear psymodel 
    (compile time option, disabled by default)</font>, workaround a bug in gcc 
    3.0.3 (compiler options, based upon suggestions from various people, see archives 
    and changelog for more)</li>
  <li>Steve Lhomme:&nbsp; ACM wrapper (MS-Windows codec)</li>
  <li><font color="#3366ff">Steve Lhomme:&nbsp; less memory copying on stereo 
    (interleaved) input</font></li>
  <li> <font color="#ff0000">Takehiro Tominaga: Inter-channel masking, enables 
    with --interch x option</font></li>
  <li> For buggy versions of gcc compiler (2.96*), back off on some of the advanced 
    compiler options<br>
  </li>
</ul>
<br>
<h3>LAME 3.91 &nbsp; &nbsp;December 29 2001</h3>
<ul>
  <li><font color="#ff0000">Darin Morrison:&nbsp; Bugfix for --alt-preset (for 
    content with low volume, clean vocals), only important for the "fast standard" 
    preset</font>
  </li>
  <li>Alexander Leidinger:
    <ul>
      <li>add some missing files to the distribution</li>
      <li>add --alt-preset to the man page</li>
    </ul>
  </li>
</ul>
<br>
<h3>LAME 3.90 &nbsp; &nbsp;December 21 2001</h3>
<ul>
  <li><font color="#ff0000">Many small improvements and bug fixes not added to 
    history</font></li>
  <li><font color="#ff0000">John Dahlstrom:&nbsp; more fine tuning on the auto 
    adjustment of the ATH</font></li>
  <li><font color="#3366ff">Robert Hegemann:&nbsp; small speed and quality improvements 
    for the old VBR code (--vbr-old).</font> </li>
  <li><font color="#ff0000">Robert Hegemann:&nbsp; some short block bug fixes</font> 
  </li>
  <li><font color="#ff0000">Robert Hegemann:&nbsp; Big improvements to --vbr-mtrh, 
    now encodes much more frequencies over 16khz</font> </li>
  <li><font color="#ff0000">Robert Hegemann:&nbsp; --vbr-new code disabled (outdated 
    and lower quality) and replaced with --vbr-mtrh (Both --vbr-new and --vbr-mtrh 
    now default to mtrh)</font> </li>
  <li>Robert Hegemann:&nbsp; reordering of --longhelp to give more information, 
    --extrahelp dropped </li>
  <li>Darin Morrison:&nbsp; Totally revamped and extremely high quality unified 
    preset system and other general quality improvements now available with --alt-presets: 
    <ul>
      <li> <font color="#ff0000">some improvements to psychoacoustics (vast improvements 
        over default L.A.M.E. modes) when --alt-preset is used including:</font></li>
      <ul>
        <li> <font color="#ff0000">Improved tuning of short block usage.</font></li>
        <li> <font color="#ff0000">Improved quantization selection usage (the 
          -X modes), now adapts between appropriate modes on the fly. Also helps 
          on "dropout" problems and with pre-echo cases.</font></li>
        <li> <font color="#ff0000">Improved joint stereo usage. Thresholds are 
          better tuned now and fix some "dropout" problems L.A.M.E. suffers from 
          on clips like serioustrouble.</font></li>
        <li> <font color="#ff0000">Improved noise shaping usage. Now switches 
          between noise shaping modes on the fly (toggles -Z on and off when appropriate) 
          which allows lower bitrates but without the quality compromise.</font></li>
        <li> <font color="#ff0000">Clips vastly improved over default L.A.M.E. 
          modes (vbr/cbr/abr, including --r3mix): castanets, florida_seq, death2, 
          fatboy, spahm, gbtinc, ravebase, short, florida_seq, hihat, bassdrum, 
          2nd_vent_clip, serioustrouble, bloodline, and others. No degraded clips 
          known.</font></li>
        <li> VBR bitrates are now more "stable" with less fluctuation -- not dipping 
          too low on some music and not increasing too high unnecessarily on other 
          music. "--alt-preset standard" provides bitrates roughly within the 
          range of 180-220kbps, often averaging close to 192kbps.</li>
      </ul>
      <li> --alt-presets replace the --dm-presets and "metal" preset is removed 
        and replaced with generic abr and cbr presets.</li>
      <li> --alt-preset extreme (note the 'e') replaces xtreme to help eliminate 
        some confusion</li>
      <li> --alt-preset vbr modes now have a fast option which offers almost no 
        compromise in speed.</li>
      <li> --alt-preset standard (and "fast standard") are now much lower in bitrate, 
        matching --r3mix with an overall average, though offering higher quality 
        especially on difficult test samples.</li>
      <li> --alt-presets are no longer just "presets" as in a collection of switches, 
        instead they are now quality "modes" because of special code level tunings 
        (those mentioned above).</li>
      <li> Use --alt-preset help for more information.</li>
    </ul>
  </li>
  <li>Roel VdB: more tuning on the --r3mix preset </li>
  <li>Jon Dee, Roel VdB:&nbsp; INFO tag</li>
  <li>Alexander Leidinger, [e-mail]:&nbsp; added --scale-l and --scale-r 
    to scale stereo channels independantly </li>
  <li>Takehiro Tominaga:&nbsp; <font color="#ff0000">new noise shaping mode, offering 
    more "cutting edge" shaping according to masking, enabled via -q0</font> </li>
  <li>Mark Taylor:&nbsp; More work on --nogap </li>
  <li>Gabriel Bouvigne:&nbsp; Small changes to abr code for more accurate final 
    bitrate </li>
  <li>Gabriel Bouvigne, [e-mail]:&nbsp; Preliminary <a
 href="http://www.replaygain.org"> ReplayGain</a> analysis code added (not functional 
    yet) </li>
  <li>Gabriel Bouvigne, Alexander Leidinger:&nbsp; Documentation updates </li>
  <li>John Dahlstrom, [e-mail]:&nbsp; floating point interface function 
    in the Windows DLL</li>
</ul>
<br>
<h3>LAME 3.89beta&nbsp; &nbsp;July 5 2001</h3>
<ul>
  <li> John Stewart:&nbsp; long filename support for Win9x/NT.</li>
  <li> Takehiro Tominaga:&nbsp; LAME can calculate the CRC of VBR header, so now 
    "lame -pv" works fine.</li>
  <li><font color="#ff0000">Robert Hegemann:&nbsp; Improvements of the new VBR 
    code (--vbr-mtrh).</font></li>
  <li><font color="#3366ff">Robert Hegemann: New VBR code (--vbr-mtrh) is now 
    defaulted to get more feedback. The VBR speed is now on par with CBR. We will 
    use the old VBR code in the release.</font></li>
  <li><font color="#ff0000">Gabriel Bouvigne: Change of the maximum frame size 
    limit. LAME should now be more friendly with hardware players.</font></li>
  <li>Gabriel Bouvigne: Size of VBR is now more balanced according to the -V value.</li>
  <li>Alexander Leidinger: Finished the implementation of the set/get functions.</li>
  <li>John Dahlstrom: LAME now handles 24bits input</li>
  <li>Mark Taylor: bugs in lame --decode causing truncation of mp3 file fixed</li>
  <li>Mark Taylor: preliminary --nogap support</li>
  <li>"Final" API completed: shared library safe! &nbsp;This API is frozen and 
    should be backwords compatiable with future versions of libmp3lame.so, but 
    we will continue to add new functionality. &nbsp;<br>
  </li>
</ul>
<h3> LAME 3.88beta&nbsp;&nbsp; March 25 2001</h3>
<ul>
  <li> <font color="#ff0000">A lot of work that was never added to the History!</font></li>
  <li> <font color="#ff0000">Frank Klemm and Gabriel Bouvigne:&nbsp; New ATH formula.&nbsp; 
    Big improvement for high bitrate encodings.</font></li>
  <li> <font color="#ff0000">Takehiro Tominaga: Temporal masking</font></li>
  <li> <font color="#ff0000">Gabriel Bouvigne/Mark Taylor: auto adjustment of 
    ATH</font></li>
  <li> <font color="#ff0000">Robert Hegemann:&nbsp; Better outer_loop stopping 
    criterion.&nbsp; Enabled with -q2 or better.</font></li>
  <li> <font color="#ff0000">Robert Hegemann/Naoki Shibata:&nbsp; slow/carefull 
    noise shaping.&nbsp; -q3..9:&nbsp; amplify all distorted bands.&nbsp; -q2: 
    amplify distorted bands within 50%.&nbsp; -q1-0:&nbsp; amplify only most distorted 
    band at each iteration.</font></li>
  <li> <font color="#ff0000">Takehiro Tominaga: Interframe, shortblock temporal 
    masking.</font></li>
  <li> Takehiro Tominaga:&nbsp; LAME restructured into a shared library and front 
    end application.&nbsp; Slight changes to the API. More changes are coming 
    to turn LAME into a true shared library (right now you have to recompile if 
    you upgrade the library :-(</li>
  <li> <font color="#000000">Naoki Shibata:</font></li>
  <ul>
    <li> <font color="#ff0000">improvements to psychoacoustics</font><font
 color="#000000"> (--nspsytune)</font></li>
    <li> <font color="#ff0000">BUG in long block pre echo control fixed </font><font color="#000000"> 
      (some out of range array access in M/S psychoacoustics)</font></li>
  </ul>
  <li> <font color="#000000">Ralf Kempkens:&nbsp;&nbsp;&nbsp; Visual Basic Script 
    for lame, suggested to put it on your Windows Desktop and you can drag'n'drop 
    Waves to encode on it.</font></li>
  <li> <font color="#000000">Alexander Stumpf:&nbsp;&nbsp;&nbsp; improved lame.bat 
    for 4Dos users</font></li>
  <li> <font color="#000000">Mark Taylor: Several bugs fixed in the resampling 
    code.</font></li>
  <li> <font color="#000000">Frank Klemm, Robert Hegemann:&nbsp;&nbsp;&nbsp; added 
    assembler code for CPU feature detection on runtime (MMX, 3DNow, SIMD)</font></li>
  <li> <font color="#3366ff">Takehiro Tominaga: 3DNow FFT code.</font></li>
  <li> <font color="#000000">Florian Bome, Alexander Leidinger:&nbsp;&nbsp;&nbsp; 
    more work on configure stuff</font></li>
  <li> <font color="#000000">Alexander Leidinger:&nbsp;&nbsp; automake/libtool 
    generated Makefiles and TONS of other work.</font></li>
  <li> <font color="#000000">Alexander Leidinger:&nbsp;&nbsp; Much work towards 
    shared library style API.</font></li>
  <li> <font color="#000000">Anonymous: New more efficient RTP code.</font></li>
  <li> <font color="#ff0000">Mark Taylor: psycho-acoustic data now computed for 
    all scalefactor bands (up to 24 kHz)</font></li>
  <li> <font color="#ff0000">Mark Taylor, Takehiro Tominaga: All ISO table data 
    replaced by formulas - should improve MPEG2.5 results for which we never had 
    correct table data.</font></li>
</ul>
<h3> LAME 3.87alpha&nbsp; September 25 2000</h3>
<ul>
  <li> Mark Taylor:&nbsp; Bug fixed in LAME/mpglib error recovery when encountering 
    a corrupt&nbsp; MP3 frame during *decoding*.</li>
  <li> Albert Faber:&nbsp; added LayerI+II decoding support</li>
  <li> <font color="#000000">Frank Klemm:&nbsp; added improved CRC calculation</font></li>
  <li> <font color="#000000">Frank Klemm: substantial code cleanup/improvements</font></li>
  <li> Robert Hegemann:&nbsp; Bug fixes</li>
  <ul>
    <li> <font color="#ff0000">in huffman_init</font>, could lead to segmentation 
      faults (only in rare cases, most likely at lower sample rates)</li>
    <li> <font color="#ff0000">M/S switching at lower sample rates</font> (the 
      fact there is no 2nd granule was ignored)</li>
  </ul>
  <li> <font color="#3366ff">Robert Hegemann:&nbsp; speed up in&nbsp; VBR</font></li>
  <li> Jarmo Laakkonen:&nbsp; Amiga/GCC settings for Makefile.unix.</li>
  <li> Magnus Holmgren:&nbsp; README and Makefile for (free) Borland C++&nbsp; 
    compiler. Will also compile lame_enc.dll, but this is untested.</li>
  <li> Florian Bome:&nbsp;&nbsp; LAME finally has a&nbsp; ./configure script!!</li>
</ul>
<h3> LAME 3.86beta&nbsp; August 6 2000</h3>
<ul>