lossyWAV 1.3.0 Delphi to C++ Translation Thread, Added noise linear PCM bitdepth reduction method. Options

[Nick.C]

And he's off!

Tycho has kindly started the translation of lossyWAV from Delphi to C++.

I'll need to learn it to be able to contribute meaningfully....

Changelog:

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 1.3.0m 25/03/2013

• Removed experimental new parameter --noisebtr.
• --interp-curve reinstated.
• experimental parameter --altfilter introduced to modify adaptive noise shaping method.

lossyWAV beta 1.3.0k3 08/03/2013

• 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 1.3.0j 08/02/2013

• Further experimental modification to the adaptive noise shaping routine, backed off a little but now works well with >96kHz samplerate

lossyWAV beta 1.3.0i 30/01/2013

• 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 1.3.0h 23/01/2013

• 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 1.3.0g 18/01/2013

• 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 1.3.0f 26/10/2012

• First attempt at FFMPEG compatibility;

lossyWAV beta 1.3.0e 24/09/2012

• More rounding issues found and amended;
• Output is hopefully bit identical with reference output (2nd attempt....);

lossyWAV beta 1.3.0d 18/09/2012

• 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). [edit] Found not to be at --portable. Bug hunting continues.... [/edit]

lossyWAV beta 1.3.0c 15/09/2012

• Piped I/O implemented - please report problems;
• Most bugs in bit-removal chain removed - output not yet bit identical;
• Internal FFT routines optimised.

This post has been edited by Nick.C: Mar 30 2013, 15:37

Attached File(s)

 lossyWAV_beta_1.3.0n.zip ( 337K ) Number of downloads: 60

 

[Atak_Snajpera]

unfortunatelly ripbot264 is just a gui for other tools. something like megui. i hope that new version will work with this chain

ffmpeg -> lossywav -> ffmpeg/flac

i can not use flac.exe for decoding because it can't send large wavs via pipe.

how multithreading code will work? proccesing all channels at once or something else?

This post has been edited by Atak_Snajpera: Oct 18 2012, 10:04