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toolame
an optimized mpeg 1/2 layer 2 audio encoder
www.cryogen.com/mikecheng
All changes to the ISO source are licensed under the GPL
(see COPYING for details)
INTRODUCTION
tooLAME is an optimized Mpeg Audio 1/2 Layer 2 encoder. It is based heavily on
- the ISO dist10 code
- improvement to algorithms as part of the LAME project (www.sulaco.org/mp3)
- work by myself and other contributors (see CONTRIBUTORS)
CONTRIBUTORS
Dist10 code writers
LAME specific contributions
fht routines from Ron Mayer <mayer@acuson.com>
fht tweaking by Mathew Hendry <math@vissci.com>
window_subband & filter_subband from LAME circa v3.30
(multiple LAME authors)
(before Takehiro's window/filter/mdct combination)
Oliver Lietz <lietz@nanocosmos.de>
Tables now included in the exe! (yay! :)
Patrick de Smet <pds@telin.rug.ac.be>
scale_factor calc speedup.
subband_quantization speedup
Federico Grau <grauf@rfa.org>
Bill Eldridge <bill@hk.rfa.org>
option for "no padding"
Nick Burch <gagravarr@SoftHome.net>
WAV file reading
os/2 Makefile mods.
Mike Cheng <mikecheng@cryogen.com>
Most of the rest
INSTALLATION
1. edit Makefile
2. 'make'
USAGE
./toolame [options] <input> <output>
Input File
tooLAME parses AIFF and WAV files for file info
raw PCM is assumed if no header is found
for stdin use a -
Output File
file is automatically renamed from *.* to *.mp2
for stdout use a -
Input Options
-s sfrq
if inputting raw PCM sound, you must specify the sample rate
default sample rate is 44.1khz.
-a
downmix from stereo to mono
if the incoming file is stereo, combine the audio into
a single channel
-x
force byte-swapping of the input. (current endian detection if naff,
so if toolame just produces noise, just use -x )
Output Options
-m mode
the encoding mode (default 'j')
's' stereo
'd' dual channel
'j' joint stereo
'm' mono
-p psy
which psy model to use (default '1')
Different models for the psychoacoustics
Choice between 1 or 2.
-b br
the total bitrate (default '192')
-v lev
Switch on VBR mode *** experimental ***
'lev' is the minimum MNR acceptable and the bitrate is increased
until this criteria is met. Useful range -5 to 15. (usu 5)
Only valid for 44.1khz input. Anything else and it will choke.
[need to properly switch over the alloc tables]
Operation
-f
fast mode turns off calculation of the psychoacoustic model.
Instead a set of default values are assumed
-q num
quick mode calculates the psy model every 'num' frames.
Misc
-d emp
de-emphasis (default 'n')
-c
mark as copyright
-o
mark as original
-e
add error protection
-r
force padding bits off
RECOMMENDED SUPPORT SOFTWARE
* mp3_check ftp://ftp.thedeepsky.com/outgoing/
A frame checker for mpeg audio layer 2 and 3.
Even groks layer2 VBR files.
* mpg123 http://mpg.123.de/ ?
Supports layer2 VBR
REFERENCE PAPERS
(Specifically LayerII Papers)
Kumar, M & Zubair, M., A high performance software implementation of mpeg audio
encoder, 1996, ICASSP Conf Proceedings (I think)
Fischer, K.A., Calculation of the psychoacoustic simultaneous masked threshold
based on MPEG/Audio Encoder Model One, ICSI Technical Report, 1997
ftp://ftp.icsi.berkeley.edu/pub/real/kyrill/PsychoMpegOne.tar.Z
Hyen-O et al, New Implementation techniques of a real-time mpeg-2 audio encoding
system. p2287, ICASSP 99.
Imai, T., et al, MPEG-1 Audio real-time encoding system, IEEE Trans on Consumer
Electronics, v44, n3 1998. p888
Teh, D., et al, Efficient bit allocation algorithm for ISO/MPEG audio encoder,
Electronics Letters, v34, n8, p721
Murphy, C & Anandakumar, K, Real-time MPEG-1 audio coding and decoding on a DSP
Chip, IEEE Trans on Consumer Electronics, v43, n1, 1997 p40
Hans, M & Bhaskaran, V., A compliant MPEG-1 layer II audio decoder with 16-B
arithmetic operations, IEEE Signal Proc Letters v4 n5 1997 p121
mikecheng@cryogen.com
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