JPEG on NIOS II

[Altera_Forum]

Does anyone know how to display JPEGs on the Lancelot VGA daughter card on a NIOS II system? Is there a freely available jpeg component? Could one use the Linux jpeg libraries? Any ideas?  

 I want to load a jpeg from network share (or send it from a host PC) , decode it to a memory space and then DMA the image to the Lancelot ( which is basically a 3 x 8bit video DAC with H & V sync pins)   Any suggestions  Thanks everyone

[Altera_Forum]

use IJG jpeglib library (www.ijg.org), most software is based around this decoder. It's highly portable in that it literally takes a few minutes to port to a new target (should run straight out of the box!) and it's free - only rule is you have to put a small copyright notice somewhere (i.e documentation). In the past I've used it on various consoles, Playstation 1 & dreamcast without any effort. 

 Adrian

[Altera_Forum]

Agree with Adrian's assertion about the freeware decoders. What is really cool is doing some HW acceleration to make it go faster :-) My guess is that a DCT would be necessary or something similar. If you do such a thing please post the result, I know a lot of people who are interested in such things!

[Altera_Forum]

That sounds like a fun project, I'm trying to do something like that at home. 

 My processor will probably be the size of 5 NIOS II processors but that&#39;s ok http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif   I&#39;m going for a quad vector architecture so that I can work on the video in 2x2 blocks.  and adac, are you a console developer?

[Altera_Forum]

Hi guys I’ve been trying to compile the jpeg source code for the NIOS II Linux Distro, but I’ve caught a snag. It seems that the libc.a that I have gives a compiler error. Now I am completely new to this cross-compiling thing so maybe I’m doing something wrong, or just missing something. But the source compiles flawlessly wit the gcc that came with the Windows NT update.  

 Here is the ./configure output <div class='quotetop'>QUOTE </div>  --- Quote Start ---  checking for gcc... gcc checking whether the C compiler (gcc  ) works... yes checking whether the C compiler (gcc  ) is a cross-compiler... no checking whether we are using GNU C... egrep: not found no checking how to run the C preprocessor... gcc -E checking for function prototypes... yes checking for stddef.h... yes checking for stdlib.h... yes checking for string.h... yes checking for size_t... yes checking for type unsigned char... yes checking for type unsigned short... yes checking for type void... yes checking for working const... yes checking for inline... __inline__ checking for broken incomplete types... ok checking for short external names... ok checking to see if char is signed... yes checking to see if right shift is signed... yes checking to see if fopen accepts b spec... yes checking for a BSD compatible install... /bin/install -c checking for ranlib... ranlib checking libjpeg version number... 62 creating ./config.status creating Makefile creating jconfig.h jconfig.h is unchanged[/b]  --- Quote End ---    Then I edit the Makefile and change the CC option from gcc to nios2-elf-gcc. Next I run nios2-elf-make.  <div class='quotetop'>QUOTE </div>  --- Quote Start ---  nios2-elf-gcc -O  -I. -c -o jcapistd.o jcapistd.c nios2-elf-gcc -O  -I. -c -o jctrans.o jctrans.c nios2-elf-gcc -O  -I. -c -o jcparam.o jcparam.c nios2-elf-gcc -O  -I. -c -o jdatadst.o jdatadst.c nios2-elf-gcc -O  -I. -c -o jcinit.o jcinit.c nios2-elf-gcc -O  -I. -c -o jcmaster.o jcmaster.c nios2-elf-gcc -O  -I. -c -o jcmarker.o jcmarker.c nios2-elf-gcc -O  -I. -c -o jcmainct.o jcmainct.c nios2-elf-gcc -O  -I. -c -o jcprepct.o jcprepct.c nios2-elf-gcc -O  -I. -c -o jccoefct.o jccoefct.c nios2-elf-gcc -O  -I. -c -o jccolor.o jccolor.c nios2-elf-gcc -O  -I. -c -o jcsample.o jcsample.c nios2-elf-gcc -O  -I. -c -o jchuff.o jchuff.c nios2-elf-gcc -O  -I. -c -o jcphuff.o jcphuff.c  nios2-elf-gcc -O  -I. -c -o jcdctmgr.o jcdctmgr.c nios2-elf-gcc -O  -I. -c -o jfdctfst.o jfdctfst.c nios2-elf-gcc -O  -I. -c -o jfdctflt.o jfdctflt.c nios2-elf-gcc -O  -I. -c -o jfdctint.o jfdctint.c nios2-elf-gcc -O  -I. -c -o jdapimin.o jdapimin.c nios2-elf-gcc -O  -I. -c -o jdapistd.o jdapistd.c nios2-elf-gcc -O  -I. -c -o jdtrans.o jdtrans.c nios2-elf-gcc -O  -I. -c -o jdatasrc.o jdatasrc.c nios2-elf-gcc -O  -I. -c -o jdmaster.o jdmaster.c nios2-elf-gcc -O  -I. -c -o jdinput.o jdinput.c nios2-elf-gcc -O  -I. -c -o jdmarker.o jdmarker.c nios2-elf-gcc -O  -I. -c -o jdhuff.o jdhuff.c nios2-elf-gcc -O  -I. -c -o jdphuff.o jdphuff.c nios2-elf-gcc -O  -I. -c -o jdmainct.o jdmainct.c nios2-elf-gcc -O  -I. -c -o jdcoefct.o jdcoefct.c nios2-elf-gcc -O  -I. -c -o jdpostct.o jdpostct.c nios2-elf-gcc -O  -I. -c -o jddctmgr.o jddctmgr.c nios2-elf-gcc -O  -I. -c -o jidctfst.o jidctfst.c nios2-elf-gcc -O  -I. -c -o jidctflt.o jidctflt.c nios2-elf-gcc -O  -I. -c -o jidctint.o jidctint.c nios2-elf-gcc -O  -I. -c -o jidctred.o jidctred.c nios2-elf-gcc -O  -I. -c -o jdsample.o jdsample.c nios2-elf-gcc -O  -I. -c -o jdcolor.o jdcolor.c nios2-elf-gcc -O  -I. -c -o jquant1.o jquant1.c nios2-elf-gcc -O  -I. -c -o jquant2.o jquant2.c nios2-elf-gcc -O  -I. -c -o jdmerge.o jdmerge.c nios2-elf-gcc -O  -I. -c -o jcomapi.o jcomapi.c nios2-elf-gcc -O  -I. -c -o jutils.o jutils.c nios2-elf-gcc -O  -I. -c -o jerror.o jerror.c nios2-elf-gcc -O  -I. -c -o jmemmgr.o jmemmgr.c nios2-elf-gcc -O  -I. -c -o jmemnobs.o jmemnobs.c rm -f libjpeg.a ar rc libjpeg.a  jcapimin.o jcapistd.o jctrans.o jcparam.o jdatadst.o jcinit.o j cmaster.o jcmarker.o jcmainct.o jcprepct.o jccoefct.o jccolor.o jcsample.o jchuf f.o jcphuff.o jcdctmgr.o jfdctfst.o jfdctflt.o jfdctint.o jdapimin.o jdapistd.o jdtrans.o jdatasrc.o jdmaster.o jdinput.o jdmarker.o jdhuff.o jdphuff.o jdmainct .o jdcoefct.o jdpostct.o jddctmgr.o jidctfst.o jidctflt.o jidctint.o jidctred.o jdsample.o jdcolor.o jquant1.o jquant2.o jdmerge.o jcomapi.o jutils.o jerror.o j memmgr.o jmemnobs.o ranlib libjpeg.a nios2-elf-gcc -O  -I. -c -o cjpeg.o cjpeg.c nios2-elf-gcc -O  -I. -c -o rdppm.o rdppm.c nios2-elf-gcc -O  -I. -c -o rdgif.o rdgif.c nios2-elf-gcc -O  -I. -c -o rdtarga.o rdtarga.c nios2-elf-gcc -O  -I. -c -o rdrle.o rdrle.c nios2-elf-gcc -O  -I. -c -o rdbmp.o rdbmp.c nios2-elf-gcc -O  -I. -c -o rdswitch.o rdswitch.c nios2-elf-gcc -O  -I. -c -o cdjpeg.o cdjpeg.c nios2-elf-gcc  -o cjpeg cjpeg.o rdppm.o rdgif.o rdtarga.o rdrle.o rdbmp.o rdswit ch.o cdjpeg.o libjpeg.a /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(closer.o): In function `_c lose_r&#39;: closer.o(.text+0x20): warning: _close is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(fstatr.o): In function `_f stat_r&#39;: fstatr.o(.text+0x28): warning: _fstat is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(makebuf.o): In function `_ _smakebuf&#39;: makebuf.o(.text+0xf8): warning: isatty is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(lseekr.o): In function `_l seek_r&#39;: lseekr.o(.text+0x2c): warning: _lseek is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(openr.o): In function `_op en_r&#39;: openr.o(.text+0x2c): warning: _open is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(readr.o): In function `_re ad_r&#39;: readr.o(.text+0x2c): warning: _read is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(writer.o): In function `_w rite_r&#39;: writer.o(.text+0x2c): warning: _write is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(getenv_r.o): In function ` _findenv_r&#39;: getenv_r.o(.text+0x34): undefined reference to `__env_lock&#39; getenv_r.o(.text+0xb8): undefined reference to `__env_unlock&#39; getenv_r.o(.text+0x100): undefined reference to `__env_unlock&#39; collect2: ld returned 1 exit status nios2-elf-make: *** [cjpeg] Error 1[/b]  --- Quote End ---    How do I regenerate libc.a? Is that even where the problem is? Is there another way to compile the jpeg source for the NIOS II Linux distro?   MORE INFO: JPEG source version : 6b gcc version: 2.95.3-5 (cygwin special) nios2-elf-gcc version: 3.3.3 (Altera Nios II 1.0 b316)

[Altera_Forum]

--- Quote Start ---  originally posted by janhendrik@Aug 18 2004, 11:49 AM hi guys i’ve been trying to compile the jpeg source code for the nios ii linux distro, but i’ve caught a snag. it seems that the libc.a that i have gives a compiler error. now i am completely new to this cross-compiling thing so maybe i’m doing something wrong, or just missing something. but the source compiles flawlessly wit the gcc that came with the windows nt update.   here is the ./configure output <div class='quotetop'>quote   --- quote end ---    --- quote start ---   checking for gcc... gcc checking whether the c compiler (gcc  ) works... yes checking whether the c compiler (gcc  ) is a cross-compiler... no checking whether we are using gnu c... egrep: not found no checking how to run the c preprocessor... gcc -e checking for function prototypes... yes checking for stddef.h... yes checking for stdlib.h... yes checking for string.h... yes checking for size_t... yes checking for type unsigned char... yes checking for type unsigned short... yes checking for type void... yes checking for working const... yes checking for inline... __inline__ checking for broken incomplete types... ok checking for short external names... ok checking to see if char is signed... yes checking to see if right shift is signed... yes checking to see if fopen accepts b spec... yes checking for a bsd compatible install... /bin/install -c checking for ranlib... ranlib checking libjpeg version number... 62 creating ./config.status creating makefile creating jconfig.h jconfig.h is unchanged  --- Quote End ---    Then I edit the Makefile and change the CC option from gcc to nios2-elf-gcc. Next I run nios2-elf-make.  <div class='quotetop'>QUOTE </div>  --- Quote Start ---  nios2-elf-gcc -O  -I. -c -o jcapistd.o jcapistd.c nios2-elf-gcc -O  -I. -c -o jctrans.o jctrans.c nios2-elf-gcc -O  -I. -c -o jcparam.o jcparam.c nios2-elf-gcc -O  -I. -c -o jdatadst.o jdatadst.c nios2-elf-gcc -O  -I. -c -o jcinit.o jcinit.c nios2-elf-gcc -O  -I. -c -o jcmaster.o jcmaster.c nios2-elf-gcc -O  -I. -c -o jcmarker.o jcmarker.c nios2-elf-gcc -O  -I. -c -o jcmainct.o jcmainct.c nios2-elf-gcc -O  -I. -c -o jcprepct.o jcprepct.c nios2-elf-gcc -O  -I. -c -o jccoefct.o jccoefct.c nios2-elf-gcc -O  -I. -c -o jccolor.o jccolor.c nios2-elf-gcc -O  -I. -c -o jcsample.o jcsample.c nios2-elf-gcc -O  -I. -c -o jchuff.o jchuff.c nios2-elf-gcc -O  -I. -c -o jcphuff.o jcphuff.c  nios2-elf-gcc -O  -I. -c -o jcdctmgr.o jcdctmgr.c nios2-elf-gcc -O  -I. -c -o jfdctfst.o jfdctfst.c nios2-elf-gcc -O  -I. -c -o jfdctflt.o jfdctflt.c nios2-elf-gcc -O  -I. -c -o jfdctint.o jfdctint.c nios2-elf-gcc -O  -I. -c -o jdapimin.o jdapimin.c nios2-elf-gcc -O  -I. -c -o jdapistd.o jdapistd.c nios2-elf-gcc -O  -I. -c -o jdtrans.o jdtrans.c nios2-elf-gcc -O  -I. -c -o jdatasrc.o jdatasrc.c nios2-elf-gcc -O  -I. -c -o jdmaster.o jdmaster.c nios2-elf-gcc -O  -I. -c -o jdinput.o jdinput.c nios2-elf-gcc -O  -I. -c -o jdmarker.o jdmarker.c nios2-elf-gcc -O  -I. -c -o jdhuff.o jdhuff.c nios2-elf-gcc -O  -I. -c -o jdphuff.o jdphuff.c nios2-elf-gcc -O  -I. -c -o jdmainct.o jdmainct.c nios2-elf-gcc -O  -I. -c -o jdcoefct.o jdcoefct.c nios2-elf-gcc -O  -I. -c -o jdpostct.o jdpostct.c nios2-elf-gcc -O  -I. -c -o jddctmgr.o jddctmgr.c nios2-elf-gcc -O  -I. -c -o jidctfst.o jidctfst.c nios2-elf-gcc -O  -I. -c -o jidctflt.o jidctflt.c nios2-elf-gcc -O  -I. -c -o jidctint.o jidctint.c nios2-elf-gcc -O  -I. -c -o jidctred.o jidctred.c nios2-elf-gcc -O  -I. -c -o jdsample.o jdsample.c nios2-elf-gcc -O  -I. -c -o jdcolor.o jdcolor.c nios2-elf-gcc -O  -I. -c -o jquant1.o jquant1.c nios2-elf-gcc -O  -I. -c -o jquant2.o jquant2.c nios2-elf-gcc -O  -I. -c -o jdmerge.o jdmerge.c nios2-elf-gcc -O  -I. -c -o jcomapi.o jcomapi.c nios2-elf-gcc -O  -I. -c -o jutils.o jutils.c nios2-elf-gcc -O  -I. -c -o jerror.o jerror.c nios2-elf-gcc -O  -I. -c -o jmemmgr.o jmemmgr.c nios2-elf-gcc -O  -I. -c -o jmemnobs.o jmemnobs.c rm -f libjpeg.a ar rc libjpeg.a  jcapimin.o jcapistd.o jctrans.o jcparam.o jdatadst.o jcinit.o j cmaster.o jcmarker.o jcmainct.o jcprepct.o jccoefct.o jccolor.o jcsample.o jchuf f.o jcphuff.o jcdctmgr.o jfdctfst.o jfdctflt.o jfdctint.o jdapimin.o jdapistd.o jdtrans.o jdatasrc.o jdmaster.o jdinput.o jdmarker.o jdhuff.o jdphuff.o jdmainct .o jdcoefct.o jdpostct.o jddctmgr.o jidctfst.o jidctflt.o jidctint.o jidctred.o jdsample.o jdcolor.o jquant1.o jquant2.o jdmerge.o jcomapi.o jutils.o jerror.o j memmgr.o jmemnobs.o ranlib libjpeg.a nios2-elf-gcc -O  -I. -c -o cjpeg.o cjpeg.c nios2-elf-gcc -O  -I. -c -o rdppm.o rdppm.c nios2-elf-gcc -O  -I. -c -o rdgif.o rdgif.c nios2-elf-gcc -O  -I. -c -o rdtarga.o rdtarga.c nios2-elf-gcc -O  -I. -c -o rdrle.o rdrle.c nios2-elf-gcc -O  -I. -c -o rdbmp.o rdbmp.c nios2-elf-gcc -O  -I. -c -o rdswitch.o rdswitch.c nios2-elf-gcc -O  -I. -c -o cdjpeg.o cdjpeg.c nios2-elf-gcc  -o cjpeg cjpeg.o rdppm.o rdgif.o rdtarga.o rdrle.o rdbmp.o rdswit ch.o cdjpeg.o libjpeg.a /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(closer.o): In function `_c lose_r&#39;: closer.o(.text+0x20): warning: _close is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(fstatr.o): In function `_f stat_r&#39;: fstatr.o(.text+0x28): warning: _fstat is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(makebuf.o): In function `_ _smakebuf&#39;: makebuf.o(.text+0xf8): warning: isatty is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(lseekr.o): In function `_l seek_r&#39;: lseekr.o(.text+0x2c): warning: _lseek is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(openr.o): In function `_op en_r&#39;: openr.o(.text+0x2c): warning: _open is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(readr.o): In function `_re ad_r&#39;: readr.o(.text+0x2c): warning: _read is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(writer.o): In function `_w rite_r&#39;: writer.o(.text+0x2c): warning: _write is not implemented and will always fail /cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc -lib/nios2-elf/3.3.3/../../../../nios2-elf/lib/libc.a(getenv_r.o): In function ` _findenv_r&#39;: getenv_r.o(.text+0x34): undefined reference to `__env_lock&#39; getenv_r.o(.text+0xb8): undefined reference to `__env_unlock&#39; getenv_r.o(.text+0x100): undefined reference to `__env_unlock&#39; collect2: ld returned 1 exit status nios2-elf-make: *** [cjpeg] Error 1[/b]  --- Quote End ---    How do I regenerate libc.a? Is that even where the problem is? Is there another way to compile the jpeg source for the NIOS II Linux distro?   MORE INFO: JPEG source version : 6b gcc version: 2.95.3-5 (cygwin special) nios2-elf-gcc version: 3.3.3 (Altera Nios II 1.0 b316) [/b]  --- Quote End ---   it looks like the library compiled with the PC compiler. I think you&#39;ll need to force the cc & library tools to be the nios2-elf ones.  Adrian

[Altera_Forum]

TO_BE_DONE

[Altera_Forum]

Ok, I see now that you used ./configure which configued for a PC version but then changed the generated makefile. 

 The library looks like it built ok and it&#39;s only the sample applications that don&#39;t work, they&#39;re using filing system functions which don&#39;t look like they&#39;re implemented in the nios library. If the jpeg library has been built with support for these functions then you&#39;ll need to disable that support. Good place to look is in jconfig.h to see what options are enabled when the library is built.  All you do is use the nios functions to read the file into memory, then use:  jpeg_create_decompress  jpeg_read_header  jpeg_start_decompress  [loop] jpeg_read_scanlines  jpeg_finish_decompress  jpeg_destroy_compress  you&#39;ll need to create a source manager to handle the requests from the jpeg decompressor for memory, but it&#39;s all very trivial. I think there&#39;s a basic sample somewhere and you should be able to figure out exactly what you need.  Adrian

[Altera_Forum]

you might also be better off using makefile.ansi as a starting point rather than auto-configuring from the host system. 

 Adrian

[Altera_Forum]

Hi Adrian, 

 Thaks for the help.  You mention a sample,<div class='quotetop'>QUOTE </div>  --- Quote Start ---    you&#39;ll need to create a source manager to handle the requests from the jpeg decompressor for memory, but it&#39;s all very trivial. I think there&#39;s a basic sample somewhere and you should be able to figure out exactly what you need.[/b]  --- Quote End ---   Is it a NIOS II sample or one of the JPEG samples. I&#39;d like to get the decoder to work and then perhaps try to implement a hardware DCT/inverse DCT.  Thanks again.  Jan Hendrik

[Altera_Forum]

--- Quote Start ---  originally posted by janhendrik@Aug 20 2004, 06:34 AM hi adrian,  thaks for the help.  you mention a sample,<div class='quotetop'>quote   --- quote end ---    --- quote start ---    you&#39;ll need to create a source manager to handle the requests from the jpeg decompressor for memory, but it&#39;s all very trivial. i think there&#39;s a basic sample somewhere and you should be able to figure out exactly what you need.  --- Quote End ---   Is it a NIOS II sample or one of the JPEG samples. I&#39;d like to get the decoder to work and then perhaps try to implement a hardware DCT/inverse DCT.  Thanks again.  Jan Hendrik [/b]  --- Quote End ---   jpeg sample, but as far as I can remember with the library you can get away with the only "dependancy" being malloc/free.  I posted the commands that I have here (on a windows app) that decodes an image, I can&#39;t post the whole code because although I wrote it, it&#39;s not mine to post - but the code is not that much larger than the outline I posted before, if you read the documentation with the library you&#39;ll be able to figure it out.  Although my code here is for windows, as mentioned before I&#39;ve implemented this before on other non wintel systems without any problems. I&#39;ve got some of my own code possibly at home, if I can find it and dig it out then I&#39;ll post it - don&#39;t hold your breath though, it&#39;s most likely on one of my many deathstar drivers.  Adrian

[Altera_Forum]

--- Quote Start ---  originally posted by janhendrik@Aug 20 2004, 06:34 AM hi adrian,  thaks for the help.  you mention a sample,<div class='quotetop'>quote   --- quote end ---    --- quote start ---    you&#39;ll need to create a source manager to handle the requests from the jpeg decompressor for memory, but it&#39;s all very trivial. i think there&#39;s a basic sample somewhere and you should be able to figure out exactly what you need.  --- Quote End ---   Is it a NIOS II sample or one of the JPEG samples. I&#39;d like to get the decoder to work and then perhaps try to implement a hardware DCT/inverse DCT.  Thanks again.  Jan Hendrik [/b]  --- Quote End ---   Did you want to do the DCT/IDCT yourself? (I think I saw a free opencore on the altera site for doing this).  Cheers

[Altera_Forum]

Thanks BadOmen, 

 I&#39;ll go and have a look-see, If there is a free core for dct/Idct then I would rather use that, I&#39;d just like to use "hardware accelaration" to speed things up http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif   **Wondering how fast I can decode 800x600x16bit jpeg. On cylone with NIOS II core/f**

[Altera_Forum]

Hi janhendrik, 

 Here is an sample result of JPEG decoding on Nios II. No Hardware Acceleration. I have only Stratix Edition, so -mno-hw-mul option is used to near to Cyclone.  -- Hardware -- Nios Dev Board : Stratix edition SOPC config : based on standard32  Nios II /f , ic 4k, dc 8k, hw-div enabled  VGA controller added(original) Frecuency : SOPC core : 90MHz  VGA dot frec : 40MHz VGA config : 800x600x16  -- Software -- OS : none (HAL) JPEG Decoder : modified "JPEGLS" library. I got from Japanese WEB site. (You may find "jpegls mona" on Google if you read Japanese...). This library uses Divide operation.# I tryed to use IJG source code before. Compiling was passed but it did not work correctly. I give up. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/tongue.gif  JPEG Image file : "Sunset.jpeg (800x600)". WindowsXP may include this sample image. JPEG Image is put to ROZIPFS, so this file access might be overhead.  -- Result --  Compile Options : Clocks : Time@90MHz (1) -O2 -mno-hw-mul : 3,198M : 35[s] (2) -O2 : 1,280M : 14[s] (3) -O2 -mhw-div : 327M : 3.6[s]  I think the result of Cyclone may slower than (1). Because Nios II on Cyclone can not have Barrel Shifter. I&#39;m not sure -mno-hw-mul disable Barrel Shift or not.  I hope the info helps.   p.s. for More faster JPEG decoding, I think I need to do ... - eliminate divide operation - SIMD custom instruction - Hardware DCT/IDCT - Hardware color conversion (YUV-RGB)

[Altera_Forum]

Hi Koma,  

 Thaks a lot for the info. It took longer than I thought it would, but then again its only @90Mhz not 2.4Ghz http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif  I&#39;ll have a google for "jpegls mona" because I still cant compile all the JPEG source from ijp.org. I will (soon) try to write my own decoder based on adac&#39;s advice, and when I&#39;m done I&#39;ll post the results here some where.   Thanks for eveybody&#39;s guidance and support.