Section: `Apodization functions`
From:
> For partial_tukey(n) and punchout_tukey(n), […] The use of this is
> that different parts of a block are ignored as the might contain
> transients which are hard to predict anyway. […]
to (emphasis added only in this summary, not in the source):
> For partial_tukey(n) and punchout_tukey(n), […] The use of this is
> that different parts of a block are ignored as the**y** might contain
> transients which are hard to predict anyway. […]
* Do not make empty man pages, use either pandoc or prebuild
A check is added to configure whether flac.1 and metaflac.1
are already build when pandoc is not available. This is the
case in for example dist packages
* Fix typo in new automake conditional
Subdivide_tukey is intended to replace partial_tukey and
punchout_tukey. It works in rougly the same way, but uses a more
efficient algorithm, recyling more data.
subdivide_tukey has 2 arguments, of which 1 is optional. The
first states the maximum number of parts the signal has to be
split up in, the second is the tukey parameter, divided by the
max num of parts.
subdivide_tukey(3) analyses audio with an unsplit block, with the
block split in 2 and split in 3. Here the default p of 0.5 applies
to the smallest parts, so the unsplit block effectively has a p of
0.5/3. subdivide_tukey(3/2e-1) does the same but with p of 0.2.
Currently, the man pages are converted from a docbook document, but
the conversion doesn't seem very reliable. Also, the man page is
more-or-less duplicated by the html documentation.
This commit moves all tool documentation to a markdown document which
is readable by itself and can be converted by pandoc to a man page
and can be used by Jekyll to populate the website.
As described in github issue #236, the description of compression
presets in flac.sgml wasn't updated. Also, the description of which
blocksizes are considered subset has been lagging behind in the
manpages as well as the build-in help of FLAC for years, as this
was changed back in 2007. This commit fixes those issues
Adds two new apodization functions that seem to perform better than
the apodization functions currently in the codebase and fixes three
existing windows as well.
Its important to note that this patch only affects the encoder stage
that evaluates various possible predictors. Audio encoded with these
new windows will still decode with existing legacy decoders.
= Theory =
These functions are used to window the audio data at the predictor
stage. These news functions enable the use of only part of the signal
to generate a predictor. This helps because short transients can
introduce noise into the predictor. The predictor becomes very good
at prediciting one part of the signal, instead of mediocre for the
whole block.
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
For some reason all documentation lists the max rice partition
order to be 16, while the maximum is 15. This fixes flac -H, the
man page and the HTML source code documentation
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
In the flac(1) man page, fix the path to the HTML documentation. Patch
by Joshua Kwan <joshk@triplehelix.org>, taken from the Debian patch
tracker for flac 1.2.1-6 (02_doc_path.patch).
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
Martijn van Beurden