history.html

mp3的经典 压缩 和 解压缩 源码。

        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>
  <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>