similar to: quantize after fdct, _dequant table, and idct

Hi. I am trying to find calls of idct/fdct.c functions by tracing png2theora.c calls. But found only: analyze.c:oc_dct_cost2() Where and when idct/fdct/mmxidct/mmxfdct.c functions are used? Mentions of "dct" word: ==== pacify at optima-amd64:/usr/src/libtheora-1.2.0alpha1/lib$ grep dct *.c | cut -f1 -d":" | uniq -c ???? 19 analyze.c ???? 28 decode.c ???? 22 encode.c ????? 4

Hi, Is there anything special I need to know about VP3's IDCT? I mean besides the fact that there are separate IDCTs to handle sparse coefficient matrices. Are the IDCT functions mathematically equivalent to any textbook IDCT functions? Thanks... -- -Mike Melanson --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To

Hi all, Just a stupid question The IDctSlow function on file idct.c has this line : ip[0] = (ogg_int16_t)((_Gd + _Cd ) >> 0); The ip[0] , _Gd and _Cd are of type ogg_int32_t My question is: The result of (_Gd + _Cd) can be a number with more than 16 bits ? (yes, it can be because they are int32, but the algorithm could guarantee something about that... I dont know...) If

Hello, I'm attaching IDCT MMX patch. I reused IDCT from theora-a3-MMXd.zip. It should work on 64bit X86 platform too. Here is most used functions when playing video with jet aircrafts (gripen) Ogg logical stream 310b2968 is Theora 720x480 29.97 fps video Encoded frame content is 720x480 with 0x0 offset I can play this video with like 200-300 frame drops on Athlon XP 1700+ CPU load (with

So, in preparation for some decoder optimization work planned by Rudolf Marek, the subject of the size of the registers needed in the IDCT came up. The current spec language ensures that the result is exactly compatible with the C code for VP3. This language requires that some of the arguments to the multiplies be 17 or 18 bits, because they need to hold the sum or difference of two 16-bit

Hi The Theora specification states, in section 7.9.3 ("The 1D Inverse DCT") steps 14-16: 14. Assign T[5] the value T[4] - T[5]. 15. Truncate T[5] to a 16-bit representation by dropping any higher-order bits. 16. Assign T[5] the value C4 * (-T[5]) >> 16. However, the relevant section of code in the reference decoder (lib/dec/idct.c line 50) is:

Good news, Working with synchrounous RAM (fpga internal SRAM blocks) the area usage drop from 20% to 5% of Logic Cells. And the clock frequency from 30 Mhz to 90 Mhz. Now I'm improving the latency of samples (number of clock cycles needed to decode a data sample). Report: -------------- Fitter Status : Successful - Mon Jun 5 16:38:21 2006 Quartus II Version : 5.1 Build 176 10/26/2005 SJ

Hello! I just noticed how the LPC prediction is quantized by browsing the source code of the java port jFlac: : int sum = 0; for (int j = 0; j < order; j++) sum += qlpCoeff[j] * data[startAt+i-j-1]; data[startAt + i] = residual[i] + (sum >> lpQuantization); : I checked the C version (libFLAC) and it matches. However, it was a surprise because this way of quantizing the

Hi, I am kind of new to DTrace , I have written a script to time function calls in our application library , Wanted to know how to interpret the output from quantize of the elapsed time in each function call , here is a sample Here is the entry and return function for the library that is being traced pid$1:libswduar::entry { duarEntry[probefunc] = timestamp;

I have tried to add a plunging to the "libtheora-1.0beta2" (network bandwidth measuring component was added) and Got it success for some far now the problem is when it is added the encoding process get extremely slow (around 20 seconds delay). I think that the problem is with my modified Makefile (some flag may have missed). the following is my modified Makefile.am which is in the

I have tried to add a plunging to the "libtheora-1.0beta2" (network bandwidth measuring component was added) and Got it success for some far now the problem is when it is added the encoding process get extremely slow (around 20 seconds delay). I think that the problem is with my modified Makefile (some flag may have missed). the following is my modified Makefile.am which is in the

We are pleased to announce a new stable release of libtheora, the Xiph.org Foundation's reference implementation of the royalty-free Theora video format. This new release, version 1.1, codenamed Thusnelda, incorporates all of the recent encoder improvements we have been making over the past year, though some of the code had its genesis all the way back in 2003. It also brings substantial speed

We are pleased to announce a new stable release of libtheora, the Xiph.org Foundation's reference implementation of the royalty-free Theora video format. This new release, version 1.1, codenamed Thusnelda, incorporates all of the recent encoder improvements we have been making over the past year, though some of the code had its genesis all the way back in 2003. It also brings substantial speed

I'm getting errors like so on initial build of libtheora - 1>c1 : fatal error C1083: Cannot open source file: '..\lib\dec\x86_vc\x86stat.c': No such file or directory 1> mmxstate.c (TaskId:16) 1>c1 : fatal error C1083: Cannot open source file: '..\lib\dec\x86_vc\mmxstate.c': No such file or directory 1> mmxloopfilter.c (TaskId:16) 1>c1 : fatal error C1083:

Hi, I have been trying to use the -mllvm -debug option for clang but without much success. Do I need to build in any specific manner for this to work ? On using -mllvm -debug as follows I get the error below. $>clang -ccc-host-triple armv7-none-linux-gnueabi -mfloat-abi=softfp -mfpu=neon -mcpu=cortex-a9 -mllvm -debug fdct.i -S clang (LLVM option parsing): Unknown command line argument

Here is a patch that gets the theora_static.dsp project for VC6 building again. Aaron -------------- next part -------------- Index: win32/theora_static.dsp =================================================================== --- win32/theora_static.dsp (revision 13945) +++ win32/theora_static.dsp (working copy) @@ -41,7 +41,7 @@ # PROP Intermediate_Dir "Static_Release" # PROP

Hi all, I'd like to quantize a variable to map it into a limited set of integers for use with a colormap. "image" and filled.contour" do this mapping inside somewhere, but I'd like to choose the colors for plotting a set of polygons. Is there a pre-existing function that does something like this well? i.e., is capable of using 'breaks'?

Hello, Here is my first speedup patch. Like 10-11%. No IDCT yet. Please feel free to comment my code or even better think about improvements. :) I belive my routines are not so bad, maybe one day they will be even more faster. What needs to be optimized is the loop filter fuction. I have no ideas now how to do it. It does not leave much space for parallel stuff, copying memory from lot of

I am build from source on MSVC 2017 cl.exe and MSYS2 32 bit. Environment Machine OS: Windows 10 Prof Visual Studio C++ : 2017 Windows SDK : 10.0.17763.0 MYS2 32 : MSYS_NT-10.0-WOW | uname -m i686 *Building code as below and getting error:* tar xzf libtheora-1.2.0alpha1.tar.gz cd libtheora-1.2.0alpha1; cd libtheora-1.2.0alpha1; CC=cl ./configure --prefix=/d/smallgame/gaminganywhere/deps.posix

Hello, Here is my first speedup patch. Like 10-11%. No IDCT yet. Please feel free to comment my code or even better think about improvements. :) I belive my routines are not so bad, maybe one day they will be even more faster. What needs to be optimized is the loop filter fuction. I have no ideas now how to do it. It does not leave much space for parallel stuff, copying memory from lot of