Tycho started the Delphi to C++ translation of lossyWAV in August 2012. After some time getting to grips with C++ and a bit of debugging, I started to develop lossyWAV 1.4.0.
Changelog:lossyWAV beta 1.3.1g 01/12/2013
lossyWAV beta 1.3.1f 15/10/2013
- Drop-dead-date now end of January 2014.
- Code tidy-up.
- Modifications to --shaping altfilter.
lossyWAV beta 1.3.1e 07/10/2013
- Drop-dead-date still end of November.
- Bug hunt attempt #1 for non-specific crash.
lossyWAV beta 1.3.1d 15/09/2013
- Drop-dead-date now end of November.
- Additions to --feedback parameter: "--feedback [n]" and "V, verbose". The addition of the numeric parameter (0.0 <= n <= 10.0) allows the user to increase the feedback sensitivity. Verbose increases the level of detail in the feedback output.
- A shorter FFT analysis has been introduced: 16 samples. This is now the first additional FFT analysis to be added (using "-a 4" or "--analyses 4"). Other FFT lengths are added in increasing numerical order.
- Bug fixes in output and some variable structural changes.
lossyWAV beta 1.3.1c 04/08/2013
- Drop-dead-date now end of October.
- Additions to --feedback parameter: "r, round <n>" reduces the permitted deviation between expected added noise due to rounding and actual; "n, noise <n>" reduces the added noise level due to adaptive noise shaping; "a, aclips <n>" defines the permitted number of exceedences of the permitted adaptive noise shaping limiting level; "A, alevel <n> reduces the permitted adaptive noise shaping limiting level;
- Slight change to rounding clipping behaviour. Only clips introduced after scaling will be used when determining whether number of bits to remove should be reduced due to clipping.
lossyWAV beta 1.3.1b 20/06/2013
- Drop-dead-date now end of September. Apologies for any inconvenience caused by the introduction of an expiry date for beta versions.
lossyWAV beta 1.3.1a 18/06/2013
- Error in correction file re-combination (was restricted to 24-bit files) corrected.
lossyWAV beta 1.3.0o 11/06/2013
- Improvements to WAVE64 and RF64 compatibility;
- Correction files work again for WAV and also WAVE64 and RF64;
- Dependency on pthreadgc2.dll removed.
lossyWAV beta 1.3.0n 30/03/2013
- Introduction of WAVE64 and RF64 compatibility. lossyWAV will now read and write both formats in addition to WAV.
lossyWAV beta 1.3.0m 25/03/2013
- experimental parameter --feedback introduced to modify bit removal process to include an added noise check. Seems to work well in conjunction with "--maxclips 0" or "--maxclips 1" at lower quality settings.
lossyWAV beta 1.3.0k3 08/03/2013
- Removed experimental new parameter --noisebtr.
- --interp-curve reinstated.
- experimental parameter --altfilter introduced to modify adaptive noise shaping method.
lossyWAV beta 1.3.0j 08/02/2013
- Introduction of experimental new parameter --noisebtr which applies a new method of detemining bits to remove. Well, I say new - SebastianG did point me in this direction *quite* some time ago. Basically, the creation of the noise shaping filter for each channel outputs a numerical value that I have finally used to determine the number of bits to remove from that codec-block channel. It even works on (non-clipping) tonal samples. It should be noted that this is a complete departure from the original method - no searching for the lowest signal in the FFT output bins. Limited tuning so far - however the presets should give approximately the same resultant FLAC output bitrate from --portable up to --insane. Below --portable, I have made the quality settings more aggressive and --extraportable results in a FLAC output bitrate of approximately 283kbit/s. This is quite a drop from the 308 to 311kbit/s previously. If anyone is prepared to spend the time on some testing, that would be very much appreciated. I think that --extraportable is a bit *too* aggressive at the moment, but that is more of a feeling than anything else.
- --interp-curve removed at this time.
- beta 1.3.0k2 issued due to omission of --noisebtr from text output parameter list (used in FACT chunk and log file).
- beta 1.3.0k3 issued due to last minute fix for bits-per-sample not equal to 16.
lossyWAV beta 1.3.0i 30/01/2013
- Further experimental modification to the adaptive noise shaping routine, backed off a little but now works well with >96kHz samplerate
lossyWAV beta 1.3.0h 23/01/2013
- Further experimental modification to the adaptive noise shaping routine. NB: Testing has shown that this does not work well with >96kHz samplerate!!.
- Bug-fix: now processes >16-bit properly - unexpected integer overflow discovered where floating point was thought to be used.
lossyWAV beta 1.3.0g 18/01/2013
- Further experimental modification to the adaptive noise shaping routine. FLAC encode (-5 -b 512) from "-q X -i" results in 302kbit/s (compared to 309 kbit/s for vanilla --extraportable).
lossyWAV beta 1.3.0f 26/10/2012
- Experimental modification to the adaptive noise shaping routine, new parameter -i, --interp-curve; adds optional cubic curve interpolation in lieu of linear interpolation when determining target spectral shape for each noise shaping filter. When encoded in FLAC (-5 -b 512) using the --extraportable preset, my 10 album test set results in 304kbit/s (compared to 309 kbit/s for vanilla --extraportable).
lossyWAV beta 1.3.0e 24/09/2012
- First attempt at FFMPEG compatibility;
lossyWAV beta 1.3.0d 18/09/2012
- More rounding issues found and amended;
- Output is hopefully bit identical with reference output (2nd attempt....);
lossyWAV beta 1.3.0c 15/09/2012
- Bit removal chain error identified: C++ inherently rounds 0.5 differently from Delphi, Delphi uses Banker's rounding (round to even);
- Banker's rounding implemented;
Output is now bit identical with reference output (caveat: from testing so far).  Found not to be at --portable. Bug hunting continues.... [/edit]
This post has been edited by Nick.C: Dec 1 2013, 21:28
- Piped I/O implemented - please report problems;
- Most bugs in bit-removal chain removed - output not yet bit identical;
- Internal FFT routines optimised.