From 22f1fce330059ef8a383cf327a023d6a9da5ad3e Mon Sep 17 00:00:00 2001 From: "Matthias P. Braendli" Date: Mon, 15 Feb 2016 02:44:20 +0100 Subject: Include toolame-dab as library --- libtoolame-dab/html/changes.html | 107 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 libtoolame-dab/html/changes.html (limited to 'libtoolame-dab/html/changes.html') diff --git a/libtoolame-dab/html/changes.html b/libtoolame-dab/html/changes.html new file mode 100644 index 0000000..544ad7b --- /dev/null +++ b/libtoolame-dab/html/changes.html @@ -0,0 +1,107 @@ + + +tooLAME changes + + + + + + -- cgit v1.2.3

TooLAME 02l - 2 March 2003

Major psychoacoustic model overhauls +
- For more detail, see psycho models +
- Psychoacoustic Model 3 +
  - Psycho3 is a reimplementation of the psychoacoustic model 1 from the + ISO standard. Pretty much totally rewritten from the ground up, following the nomenclature of the ISO standard. +
  - Uses arrays for keeping tone/noise labels rather than the really + hard to grok pointer-stuff from the dist10 code. +
  - Uses Painter + Spanias' Formula for the ATH rather than the tables from the standard. +
  - Uses LAME's freq-to-bark conversion to construct the critical bands. +
  - Future: Needs a proper geometric mean for weighting the noise. Needs one more function added to the decimation routines which would eliminate maskers within 0.5 dB of each other. +
  - Eliminated all the ISO/dist10 tables. Everything is from equations or built from scratch. +
  +
- Psychoacoustic Model 4 +
  - A reimplementation of psychoacoustic model 2. +
  - Eliminated all the ISO/dist10 tables. Everything (ath, bark, critical bands) is from equations or built from scratch +
  - FUTURE: For psycho model 2 and 4 there's some really bad "warbling" and "Davros" type noise. Depending on the loudness of your sound sample, this can get really annoying. I don't know where it's coming from. +
  +
- Psychoacoustic Model 0 +
  - This model uses the ATH and the scalefactors for each subband to build an approximate SMR for each subband at nearly zero cost. +
  - Based upon an idea mentioned in "Low power mpeg/audio encoders using simplified psychoacoustic model and fast bit allocation" by Hyen-O Oh et al. +
  - For the amount of effort that this psycho model puts in, the results are pretty good. +
  - Future: Add some parameters to the equation to allow it to be tweaked on the fly. +
  +
- Psychoacoustic Model -1 +
  - This is the old "fast" psychoacoustic model ("-f"). +
  - All it does is copy over a static set of pre-calculated SMR values +
  - Sounds OK for most stuff. +
  +
+
New bitstream encoding routines (encode_new.c) +
- All the old tables.c/alloc_table stuff is now superfluous. +
- All tables are now at the top of encode_new.c +
- The tables have quite a bit of indirection to get to the value that you need (but really not any more indirection than the old alloc_table stuff). Probably need to add some more docs to say what's going on. +
- These new routines are the default, but you can remove the "NEWENCODE" definition and use the old ones (just in case). +
- The new routines will become the default in the next release. +
+
More speed +
- All the trig stuff for psychomodel 4 is now done with tables instead of calculating exact values. +
- The exact trig values aren't really used directly in the encoder. They're sort of averaged over a couple of iterations and used as a predictor of uncertainty. So being off a few thousandths won't really affect anything. +
+

+ +

TooLAME 02k - 16 February 2003

Some great speedups with a combined filtersubband and windowsubband (Ricardo Schelp ricardoschelp at arnet.com.ar) +
Cleaned up the psycho model calling (should be easier to add your own psycho +model if you felt like having a hack) +
DAB Extensions are now of variable length controlled by an argument to the -D switch + (Nicolas Croiset - ncroiset at vdl.fr) +
Fixed raw PCM reading to no longer miss the first 40 bytes. (MFC) +
No longer a 4GB limit when reading from stdin (or if your filesys supports) (Nicolas) +
Tweaks to the end of the bitstream to allow concatentation of mp2 files (Nicolas) +
Finally (?) fixed the segfaults using psy model 1 (Nicolas et al) +

+ +

TooLAME 02j - 12 Feb 2003

Definitely LGPL now. + +
encode.c - VBR mode has been stabilised to work correctly for all sampling frequencies (README.VBR has more details) + +
get_audio.c has become audio_read.c - cleaned up that really dodgy wave header parsing. +(thanks to Philippe Jouguet - philippe.jouguet at vdl.fr and Henrik Herranen - leopold at vlsi.fi) + +
spelling fix for 'extension' - Philippe again + +
psycho_I.c - Speedup for "% 1408" calcs "-DSAMI_P1" sami.sallinen at g-cluster.com + (about 4% overall speedup for me) + +
subband.c - Pointer arithmetic for filter subband "-DSAMI_SB" (sami again) + (doesn't give any advantage over gcc3.2 on my system) + +
psycho_II.c +
- enabled the use of gcc's _sincos(). "-DSINCOS -D_GNU_SOURCE" + about a 5% overall speed-up in encoding (Philippe again) +
- added the LSF frequencies so that you can use psy model 2 with LSF (good old Philippe) +
+
verbosity - added a '-t' flag to set the 'talkativity' level needed for transcode plugin (Andreas neukoetter - anti at webhome.de) + +
toolame.c - LSF files should now select a valid default bitrate by default. (96kbps) + +