Displaying 20 results from an estimated 800 matches similar to: "_LOW_ACCURACY_ good enough?"
2003 May 20
2
mdct_backward with fused muladd?
Can anybody point me at any resources that would explain how to optimize
mdct_backward for a cpu with a fused multiply-accumute unit?
>From what I understand from responses to my older postings, Tremor's
mdct_backward could be rewritten to take advantage of a muladd.
My target machine can do either two-wide 32x32 + Accum(64) -> Accum(64)
integer muladd or eight-wide 16x16 + Accum(32)
2003 Feb 05
2
vorbis on playstation 2
Hello,
I'm interested in getting vorbis up and running on the PlayStation 2. I'm
an official developer, not a ps2 linux developer, but the issues should be
roughly the same. I've gotten the code to compile but our setup
(intentionally) doesn't have libm so I'm seeing references to several
double-precision math functions.
Some of the issues I'm seeing:
- As reported on
2003 May 21
3
use of 'long' in vorbis structures
The codebase sets up ogg_int32_t, etc, but then uses long directly in several structures. Unfortunately for me longs are 64 bits on my platform, not 32, and I end up getting hammered by unnecessary software math routine calls.
Should I be able to just search/replace 'long' with 'ogg_int32_t' in the code or would that cause more problems than it fixes?
-Dave
--- >8 ----
List
2003 May 21
2
Clean separation of encode and decode?
Is anybody interested in cleanly separating encode and decode in vorbis? I'm trying to take a stab at it myself from the head of cvs as of this morning, but it looks like a lot of files contain both encode-only and decode-only functions. An obvious one is mdct.c, which contains mdct_forward and mdct_backward (which isn't that big of a deal, since both are pretty well-contained, but it
2006 Oct 09
1
Vorbis primitive API examples (LONG)
Okay, how do I drop a changeset/patchset/tag for you folks from SVN?
At this point, I have written three examples of how to use the basics of
the ogg streaming and decoding in Tremor. I heartily welcome any
suggestions, improvements and corrections that you can point out in the
code.
The examples required me to make some small modifications to the main
tremor library. However, the changes
2003 May 22
1
problems building lowmem-branch of tremor
I checked out the lowmem-branch of Tremor from CVS but some files like synthesis.c seem to be missing on that branch. What am I doing wrong?
Thanks,
-Dave
--- >8 ----
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2002 Aug 13
1
mdct.c pointer to array conversion
Hi all,
I'm attempting to convert all the pointers to arrays the mdct_backward
function so it can be partitioned off for a hardware implementation.
Although this code is quite short I'm finding it a little tricky.
As it stands, mdct_backward is passed values by reference i.e.
void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out)
o my modified version starts
void
2008 Aug 13
1
Tremor + upstream Ogg library
Hi vorbis experts!
I'd like ot write application under Symbian that use theora as video
codec & tremor as an audio one. I played at first with libogg &
theora on PC, then successfully ported them both. Next I decided
to port Tremor but I found that it use its own files from Ogg library.
The API is almost identical, so I tried to bind the Tremor with upstream
Ogg library (it actually
2008 Aug 13
0
Tremor + upstream libogg
Hi vorbis experts!
I'd like ot write application under Symbian that use theora as video
codec & tremor as an audio one. I played at first with libogg &
theora on PC, then successfully ported them both. Next I decided
to port Tremor but I found that it use its own files from Ogg library.
The API is almost identical, so I tried to bind the Tremor with upstream
Ogg library (it actually
2005 Feb 06
1
Query on Tremor-lowmem version
Hi,
While following the developer mailing list, I came across
"tremor-lowmem" version. I did some search of it in Xiph.org and
"tremor" source code but wasn't able to find it. I would like to know if
there is any separate thread for the "tremor-lowmem" version as we are
working on the fixed point implementation of Vorbis code and we are
looking forward for
2004 Jun 04
0
libogg, libogg2, Tremor compatability
Hi,
I've started working on libogg2 support in liboggz and Tremor support
in libfishsound.
I'm running into some problems with namespace clashes. Specifically,
each of libogg, libogg2 and libvorbisidec (Tremor) define conflicting
ogg_* symbols and declare incompatible ogg_* types in their headers.
While I understand that a dedicated Ogg Vorbis decoder would only
need to use one of these
2006 Aug 25
0
Incompability between libvorbis and tremor from svn?
Hi,
I'm experiencing a serious problem when trying to replace libvorbis with
tremor (from svn):
premitting that I don't want to use the ov_* functions, calling
vorbis_synthesis_headerin()
on the 3 initial packets works with libvorbis but immediately fails with
tremor.
At first sight it seems that the function in tremor either receives a
leading \n before every header
(that
2012 Feb 10
0
New repo and moving tremor discussion here
All,
I've consolidated our various svn branches of the fixed-point vorbis
decoder (known as tremor or tremolo) into a single git repository,
hoping that it facilitates review and merging of the various trees. In
particular, android has a branch of Robin Watts' Tremolo code
(arm-optimized tremor-lowmem) which I don't think anyone on the Xiph
side has looked at.
I used git-svn to
2003 Mar 31
0
Ogg Traffic for March 31, 2003
Hi Everybody:
Below is this week's Ogg Traffic in plain text. The HTML version is available at
http://www.vorbis.com/ot/20030331.html
Enjoy!
Ogg Traffic for Monday, March 31, 2003
[1]Carsten "Purple" Haese
March 31, 2003
_________________________________________________________________
Table of Contents
1. Status Updates
1.1. Monty
1.2. Michael
2002 Aug 21
1
MDCT input and output data blocks
Hi,
I'm trying to determine how the frequency data that is passed to the
MDCT, and output time domain data obtained from the MDCT, is changed
when setting #define MDCT_INTEGERIZED
For instance, the trig array, for a size 256 window begins
1.000000
0.000000
0.998795
-0.049068
0.995185
-0.098017
if INTEGERIZED is set, then it begins
16384
0
16364
-803
16305
-1605
which is simply a left shift
2012 Jun 10
1
[libtremor] ov_read is reading past file size
I have a wav file which has been converted to an ogg file with libvorbis
via ffmpeg. However I've tested a few files just to make sure.
I run a standard while loop to using ov_read to pull all the data out of
ogg file. Using 4096 as the size to read each call. Watching my debug
logs it is reading 2048 bytes each call.
When I load the wav file the data chunk for the pcm data is 167680
2002 Sep 03
0
tremor relicensed as BSD
I thought this might be interesting to the people outside those on the Vorbis
development mailing list:
http://www.xiph.org/archives/vorbis-dev/200209/0007.html
From: rillian (rillian@telus.net)
Date: Tue 03 Sep 2002 - 09:24:48 EDT
> For those of you not of the commit mailing list, I wanted to point out
> that monty has checked the fixed-point 'tremor' vorbis decoder into
>
2002 Sep 03
1
tremor relicensed as BSD
For those of you not of the commit mailing list, I wanted to point out
that monty has checked the fixed-point 'tremor' vorbis decoder into
xiph.org cvs, under the usual (free) xiph license. This was developed
for use in embedded devices, so if you've been waiting for an
interger-only (no fpu) implementation, you might want to give it a try.
The code is in the 'Tremor' cvs
2004 Sep 15
1
Theora mcomp tuning...
Hi there.
This patch changes the block selection to quantify error
based on the sum of the squared differences of the pixel
values rather than the sum of the absolute differences,
the former conventionally and statistically seeming like
the preferable thing to do.
The patch also const'ifies some parameters (which doesn't
affect code quality on recent GCCs but might help on older/
other
2009 Mar 10
2
Problems building celt-0.5.2 for blackfin
Problems building celt-0.5.2 for blackfin.
Use the following to configure:
#!/bin/sh
# bfinconf
# Set up configuration to cross compile on blackfin
./configure \
--host=bfin \
--enable-fixed-point \
CC=bfin-uclinux-gcc \
CFLAGS='-O2 '\
'-mfast-fp '\
'-ffast-math '\
'-Wall -Dlinux '\
'-D__linux__ '\
'-fno-strict-aliasing '\