|Use||Digital signal processing|
lossyWAV is a new free lossy pre-processor for PCM audio contained in the WAV file format. Proposed by David Robinson, it reduces bit depth of the input signal, which, when used in conjunction with certain lossless codecs, reduces the bitrate of the encoded file significantly compared to unpreprocessed compression. lossyWAV's primary goal is to maintain transparency with a high degree of confidence when processing any audio data.
- 1 History
- 2 Indicative bitrate reduction
- 3 File identification
- 4 Quality presets
- 5 Supported input formats
- 6 Codec compatibility
- 7 Using lossyWAV
- 8 Frequently asked questions
- 9 External links
lossyWAV is based on the lossyFLAC idea proposed by David Robinson at Hydrogenaudio, which is a method of carefully reducing the bitdepth of samples, therefore utilising the wasted bits feature of the FLAC lossless codec. The aim is to transparently reduce audio bit depth (by making some lower significant bits (lsb's) zero), consequently taking advantage of FLAC's detection of consistently-zeroed lower significant bits within each single frame and significantly increasing coding efficiency. In this way the user can enjoy audio encoded using the same codec (which may be all important from a hardware compatibility perspective) at a reduced bitrate compared to the lossless version.
Subsequently, lossyFLAC proved itself to work with other lossless codecs, so the application name was changed to lossyWAV.
Since then, Nick has heavily developed and built upon lossyWAV, with valuable tuning performed by Horst Albrecht at Hydrogenaudio. Although the current lossyWAV implementation has built on David's original method, the method itself still very much belongs to its author.
Indicative bitrate reduction
It must be stressed that lossyWAV is a pure variable bit-depth pre-processor in that the overall sample size remains the same after processing but the number of significant bits used for the samples in a codec-block can change on a block-by-block basis. Bits-to-remove from the audio data are calculated on a block-by-block basis (codec-block length = 512 samples, 11.6msec @ 44.1kHz) using overlapping fast Fourier Transform (FFT) analyses of at least two lengths (default quality preset (-q 5) = 32, 64 & 1024 samples). After some manipulation, the results of each FFT analysis for a specific codec-block are then grouped and the minimum value used to determine bits-to-remove for the whole codec-block. Bit removal adds white noise to the output, however the level of the added noise associated with the removal of a number of bits has been pre-calculated and the number of bits to remove will depend on the level of the noise floor of the codec-block in question. Each sample in the codec-block is then rounded such that the first <bits-to-remove> lsb's are zero. In this way the wasted bits feature of FLAC et al is exploited.
|lossyWAV Test Set (16 bit / 44.1kHz)||Codec||lossless||--insane||--extreme||--standard||--portable||-q 0|
|10 Album Test Set||TAK||820 kbit/s||615 kbit/s||532 kbit/s||447 kbit/s||359 kbit/s||266 kbit/s|
|10 Album Test Set||FLAC||854 kbit/s||632 kbit/s||548 kbit/s||463 kbit/s||376 kbit/s||285 kbit/s|
|10 Album Test Set||Wavpack||852 kbit/s||641 kbit/s||563 kbit/s||481 kbit/s||390 kbit/s||296 kbit/s|
lossyWAV-processed WAV files are named with a double filename extension, .lossy.wav, to make them instantly identifiable. e.g. ".lossy.flac" would indicate an audio file which was processed using lossyWAV, and subsequently encoded using FLAC.
The --correction parameter is used when processing to create a correction file which is named with the .lwcdf.wav double filename extension. When "added" to the corresponding .lossy.wav, using the --merge parameter, the original file will be reconstituted.
Combinations of lossyWAV with each specific encoder are referred to as lossyX, where X is an abbreviation of the lossless codec name. Combination names are listed in the "known supported codecs" section below.lossyWAV inserts a variable-length 'fact' chunk into the WAV file immediately after the 'fmt ' chunk. This takes the form:
fact/<size>/lossyWAV x.y.z @ dd/mm/yyyy hh:mm:ss, -q 5Where the version, date & time and user settings are copied. Additionally, if a lossyWAV 'fact' chunk is found in a file, the processing will be halted (exit code = 16) to prevent re-processing of an already processed file.
The -check parameter can be used to determine whether a file has previously been processed without trying to process it, exit code = 16 if already processed; exit code = 0 if not.
- --insane: (-q 10) Highest quality preset, generally considered to be excessive;
- --extreme: (-q 7.5) High quality preset, disc space-saving alternative to lossless archiving for large audio collections, considered to be suitable for transcoding to other lossy codecs;
- --standard: (-q 5) Default preset, generally accepted to be transparent;
- --portable: (-q 2.5) DAP quality preset for use on a compatible DAP. 
All tuning has been performed on quality preset --standard with higher presets being more conservative. Quality preset --standard is generally accepted to be (and from testing so far is) transparent. If you find a track which --standard fails to achieve transparency after processing, please post a sample (no more than 30 seconds) in the development thread.
Supported input formats
- WAV: 9-bit to 32-bit integer; 1 to 8 channels; sample rate ≥ 32kHz PCM. Very high sample rates (>48kHz) have not been extensively tested. Tunings have been focussed on 16-bit, 44.1kHz samples (i.e. CD PCM).
|Codec||Supported||Encoder parameters||Combination name|
|FLAC||Yes||-5 -b 512 --keep-foreign-metadata||lossyFLAC|
|MPEG-4 ALS||Yes||-l -n512||lossyALS|
- Combinations of lossyWAV with each specific encoder are referred to as lossyX, where X is an abbreviation of the lossless codec name.
A comparison of portable media players is here, which shows FLAC and WMA Lossless compatibility among listed players. Any player supported by Rockbox can use FLAC or WavPack files after installing Rockbox.
NB: when encoding using a lossless codec, please ensure that the block size of the lossless codec matches that of lossyWAV (default = 512 samples). If this is not done then the lossless encoding of the processed WAV file will (almost certainly) be larger than it would otherwise have been. This is achieved by adding the "Encoder Parameters" in the table above to the command line of the lossless codec in question.
Another, possibly not obvious, feature of lossyWAV is that the processed output can be "transcoded" from one lossless codec to another lossless codec with absolutely no loss of quality whatsoever. This is solely due to the fact that lossyWAV output is designed to be losslessly encoded - something that lossless codecs do very well indeed.
lossyWAV 1.1.0, Copyright (C) 2007,2008 Nick Currie. Copyleft. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. Usage : lossyWAV <input wav file> <options> Example : lossyWAV musicfile.wav Quality Options: -I, --insane highest quality output, suitable for transcoding; -E, --extreme high quality output, also suitable for transcoding; -S, --standard default quality output, considered to be transparent; -P, --portable good quality output for DAP use. Not considered to be fully transparent, but considered fit for its intended purpose. Standard Options: -c, --check check if WAV file has already been processed; default=off. errorlevel=16 if already processed, 0 if not. -C, --correction write correction file for processed WAV file; default=off. -f, --force forcibly over-write output file if it exists; default=off. -h, --help display help. -L, --longhelp display extended help. -M, --merge merge existing lossy.wav and lwcdf.wav files. -o, --outdir <t> destination directory for the output file(s). -v, --version display the lossyWAV version number. Special thanks: David Robinson for the publication of his lossyFLAC method, guidance, and the motivation to implement the method as lossyWAV. Horst Albrecht for ABX testing, valuable support in tuning the internal presets, constructive criticism and all the feedback. Sebastian Gesemann for the noise shaping coefficients and help in using them in the lossyWAV noise shaping implementation. Don Cross for the Complex-FFT algorithm used.
Example drag'n'drop batch file
Simply drag the FLAC files onto this batch file and it will process, recode in FLAC and copy ALL of the tags from the input FLAC file, placing the output lossyFLAC file in the same directory as the input FLAC file. Requires flac.exe and tag.exe to be somewhere on the path.
@echo off :repeat if %1.==. goto end if exist %1 flac -d %1 --stdout --silent|lossywav - --stdout --standard --stdinname %1|flac - -b 512 -o "%~dpn1.lossy.flac" --silent && tag --fromfile %1 "%~dpn1.lossy.flac" shift goto repeat :end
Example Foobar2000 converter settingslossyFLAC settings:
Encoder: c:\windows\system32\cmd.exe Extension : lossy.flac Parameters: /d /c c:\"program files"\bin\lossywav - --standard --silent --stdout| c:\"program files"\bin\flac - -b 512 -5 -f -o%d Format is : lossless or hybrid Highest BPS mode supported: 24lossyTAK settings:
Encoder: c:\windows\system32\cmd.exe Extension : lossy.tak Parameters : /d /c c:\"program files"\bin\lossywav - --standard --silent --stdout| c:\"program files"\bin\takc -e -p2m -fsl512 -ihs - %d Format is: lossless or hybrid Highest BPS mode supported: 24lossyWV settings:
Encoder: c:\windows\system32\cmd.exe Extension : lossy.wv Parameters: /d /c c:\"program files"\bin\lossywav - --standard --silent --stdout| c:\"program files"\bin\wavpack -hm --blocksize=512 --merge-blocks -i - %d Format is : lossless or hybrid Highest BPS mode supported: 24
There is a known problem within foobar2000 (although more likely to do with cmd.exe itself) when running an executable within the cmd.exe command line from a path which includes spaces. The suggested fix for this is to enclose the element of the path which contains spaces within double quotation marks ("), e.g. c:\"program files"\directory_where_executable_is\executable_name
Example EAC settings
Please see EAC and LossyWAV.
Frequently asked questions
- Question: Why is the ".wav" file extension used?
- Answer: The ".wav" file extension is used because lossyWAV is a digital signal processor and not a codec. No decoding is required for any program to play a WAV file which has been processed with lossyWAV as it remains compliant with the RIFF WAVE format.
- Question: Why create a processor which means that I cannot be sure that a lossless file is truly lossless?
- Answer: Unless one creates the lossless file personally, one can never be completely sure that the file is indeed lossless. e.g. If a WAV file is encoded to mp3 and then transcoded to a lossless codec, how can this pre-processing be easily determined?
- Question: Is it VBR?
- Short answer: Yes.
- Question: Do I need to re-process to change lossless codecs?
- Short answer: No.
- Question: Is it transparent?
- Short answer: At preset --standard, almost certainly.
- Question: Is it lossless?
- Short answer: No.
- Question: Will it ever have a CBR mode?
- Short answer: No.
- Question: Why should I use this?
- Original lossyFLAC thread - Introduction of the concept by David Robinson (Replay Gain developer) and initial development;
- lossyWAV 1.2.0 Development Thread - Latest release candidate and beta version in the first post;
- lossyWAV 1.1.0 development thread
- lossyWAV 1.1.0 release thread - Release of version 1.1.0 on 12 July 2008;