This fixes two problems with handling of out-of-bounds arguments
for the window functions, one of which involving an infinite loop
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
The retune of compression levels makes this test fail. This is due
to a few approximations used in the encoder that determine which
LP coefficient should result in the smallest file. Differences are
usually very small, but in my case this resulted in compression
level 6 giving a 3 byte bigger file.
This patch lets the compression test pass even if the a compression
level results in a file that is up to 10 byte larger than the
previous level
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
This patch changes a the settings associated with compression
levels 6, 7 and 8. With this patch, -e is no longer used, but
instead apodization functions are added. This should improve
compression with at least 95% of all material while not changing
the speed much. Decoding ways, 6 and 8 stay the same, and 7 is
slowed a bit, which makes it as fast as 8.
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
On Windows, decoding flac files is also prone to producing fragmented
files. Avoid fragmentation on NTFS by using Windows specific functions to
tell Windows the size of the file beforehand.
Patch-from: Janne Hyvärinen <cse@sci.fi>
Windows in particular can experience slow encoding speeds on highly
fragmented disks. Using setvbuf to increase the size of the buffer to
10Meg.
This is probably not needed on Linux/Unix, but is very unlikely to
to cause any negative effects.
Patch-from: Janne Hyvärinen <cse@sci.fi>
* Changes flac_snprintf (in src/share/grabbag/snprintf.c) and its copy
local_snprintf (src/libFLAC/metadata_iterators.c) to be almost sane.
* Adds flac_vsnprintf (src/share/grabbag/snprintf.c) and its copy
local_vsnprintf (src/share/win_utf8_io/win_utf8_io.c).
* Changes stats_print_info in src/flac/utils.c so it uses flac_vsnprintf
instead of vsnprintf. This makes return value checking unnecessary.
Patch-from: lvqcl <lvqcl.mail@gmail.com>
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>
* Removes FLAC__lpc_restore_signal_asm_ppc_altivec_16*
from lpc.h and stream_decoder.c
* Removes PPC-specific code from cpu.c and cpu.h
* Removes PPC stuff from libFLAC/Makefile.lite and build/*.mk
* Removes as/gas/PPC-specific stuff from configure.ac and
libFLAC/Makefile.am*
* Removes libFLAC/ppc folder and remove "src/libFLAC/ppc*/Makefile"
lines from configure.ac
Patch-from: lvqcl <lvqcl.mail@gmail.com>
According to patch author GCC can optimize expressions like
"(a<<8)|(a>>8)", but has problems with "(a<<8)+(a>>8)".
Patch-from: lvqcl <lvqcl.mail@gmail.com>
Accelerate FLAC__lpc_compute_autocorrelation_intrin_sse_lag_NN routines for
AMD and newer Intel CPUs (means Core i aka Nehalem and newer). Unfortunately
it's slower on older Intel CPUs.
According to tests at HA:
<http://www.hydrogenaud.io/forums/index.php?s=&showtopic=101082&view=findpost&p=870753>
CPU flac -5 flac -8
Athlon XP +5 % +2.4 %
Athlon 64 X2 +9 % +4 %
Core i +7 % +1 % ... +2.7 %
Core 2 ? -3.5 %
According to Steam HW survey <http://store.steampowered.com/hwsurvey/>
69% of Steam users have SSE4.2 which means that the new code is faster for
them. There are also AMD users that don't have SSE4.2, so 75% of Steam users
should benefit from this patch.
Patch-from: lvqcl <lvqcl.mail@gmail.com>
The html documentation was diff'ed to the current website pages
and all difference were merged into the page they weren't yet
incorporated. This includes lots of small fixes and
improvements.
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
