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Request: Port AS3 Corelib encoder functionality

Nov 19, 2008 4:07 PM

Ted Patrick had a post a while back asking the community about adding native encoder support to the player. Now that alchemy is available, would it make sense to move the functionality of the "corelib" as3 encoder libraries over to C++ equivalents?

I currently have a client side publishing app that generates 300 dpi jpeg images out of bitmapdata objects, and even with a quad core 3ghz machine, encoding a jpeg using the AS3 corelib still takes 10-15 seconds.

Would anyone at Adobe, or anyone in the community like to take a crack at bringing in a C++ jpeg encoder via alchemy? Is this possible?

52046 Views 56 Replies Latest reply: sectore, Jun 21, 2009 8:39 AM

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1. Manfred Weber,

Nov 19, 2008 4:24 PM in reply to matthewbmedia

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I was asking me the same today. Actually I was researching for valid usecases. I think that Alchemy could speed up some slow algorithms like f.e. the encoder stuff you mentioned. Can anyone give some feedback on this?
However I played with Alchemy today and hope to see some tests regarding performance.

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2. metalbot,

Nov 19, 2008 5:09 PM in reply to matthewbmedia

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I'm taking a quick stab at it (downloaded http://www.ijg.org/files/jpegsrc.v6b.tar.gz , then ran ./configure on it.)

It feels kinda weird to see that ./configure is repeatedly invoking AIR apps created on the fly to test if various features exist, but it works all the same.

It compiled without a problem, and I know have a 377KB file named jpeg.l.bc.

I still have to write some glue to call it from as3, but that shouldn't be a big deal, except I'll have to engage my brain long enough to learn what functions are exposed by the jpeg library.

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3. metalbot,

Nov 19, 2008 9:05 PM in reply to matthewbmedia

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There appears to be little red ***** things hiding in my details.

Various findings so far:

- Using gluegen with functions that return a Boolean results in generated code that calls an AS3_Boolean() function. That function doesn't exist in the current release, although it's not hard to define an approximation of it as static AS3_Val AS3_Boolean(int val) { return val?AS3_True():AS3_False(); }

- You can use "import" statements in .gg file, so you don't have to patch the resulting .as file afterward simply because you like ByteArrays.

- However, gluegen-generated .as files don't seem to expose the .supplyFile() method and that does seem to require patching.

- talking about .supplyFile(), the method works great to fake file reads, but is not written to handle file writes. That's a downer as libjpeg apparently wants to write encoded JPEG data into a FILE* structure.

- minor quibble: if you're thinking of writing an AIR app with Alchemy that would read humongous files, don't. At least, not yet. The current implementation of open() reads the entire file in memory before returning a handle.

- dead code removal isn't quite as good as I'd hope. whatever your glue file doesn't use gets compiled away. But that's it. The entire code in the final .swc will be included in any project that references it. That's probably because the CLibInit class hardcodes references to every other chunk in the .swc. So to optimize for size, you'll have to cut through your glue files and rebuild SWCs that contain only what you use.

Anyway, at this point, I'm hoping I overlooked some way of using libjpeg without FILE* handles.

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4. matthewbmedia,

Nov 20, 2008 9:10 AM in reply to metalbot

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Thanks Metalbot for taking a stab at this. I was wondering if there would be hiccups in terms of passing a bytearray object off to be encoded by a jpeg library, as opposed to using a file reference. Please keep us updated on your progress! And anyone else feel free to chip in.

I definitely think this would be a great provision from Adobe if anyone on the Adobe team wants to provide some killer-app-worthy sample libraries... ;-)

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5. Branden_Hall,

Nov 20, 2008 10:22 AM in reply to matthewbmedia

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I'm not super familiar with GlueGen (when I started working with Alchemy it wasn't available yet) but I hope I can help a little bit.

The FILE* handles can be dealt with by using a C standare library function called funopen - this lets you create a file handle that goes and calls functions for read, write, lseek, and close.

http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=funopen

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6. joesteele,

Nov 20, 2008 4:15 PM in reply to metalbot

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Great feedback! I am looking into posting a sample of using libpng (the one demo'ed during MAX). It did not make it into the package unfortunately.

Regarding the various performance/codesize woes -- yes there are a bunch of improvements that can be made. If there is enough interest in the community we may get the chance to make them.

Regarding gluegen and AS3_Boolean -- yup -- that's a bug. It's on my queue now. Thanks.

Regarding gluegen and import -- yes -- that was my error in the README for as3_crypto_wrapper. I will try to put some docs together for gluegen and get them up which address this.

Regarding gluegen and supplyFile() -- hmm that should be exposed. I will investigate more.

Joe

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7. metalbot,

Nov 20, 2008 6:06 PM in reply to matthewbmedia

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Alrighty, here's a simple wrapper around the encoding part of libjpeg.
It uses a custom destination manager (some semi-obscure libjpeg feature) to avoid the whole FILE* issue.

http://hurlant.com/as3_encoder_jpeg.tgz

You'll need to get libjpeg separately. there's a README.txt in my .tgz file that glosses over the steps.

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8. matthewbmedia,

Nov 21, 2008 2:17 PM in reply to joesteele

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Thanks Joe -

yes! Yes there is interest!

An Adobe optimized library for encoding images would not only be a great demo of the capabilities of alchemy, it would actually have incredible real world use!

Send me your managers email address, and I will tell them to schedule more vacation time for you... :-)

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9. matthewbmedia,

Nov 24, 2008 8:59 AM in reply to metalbot

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Thanks Metalbot!

I was hoping the speed would get better with larger byte arrays, but have only seen a linear comparison between the C and AS3 routines for encoding a jpeg.

Sadly the C version takes about 18 seconds to encode a 2400x2400 pixel bitmapdata bytearray, while the straight as3 version takes about 14 seconds.

I didn't notice any real bottlenecks in your implementation metalbot - but I'm definitely not a C guru - so maybe somebody from Adobe could take a look, as this would be a really good use case to test alchemy performance.

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10. vevedh,

Nov 24, 2008 5:24 PM in reply to matthewbmedia

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I try compile " http://www.netsieben.com/products/sshlib" without success

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11. metalbot,

Nov 24, 2008 7:36 PM in reply to matthewbmedia

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vevedh, I suspect the OpenSSH portable library would be a smoother ride.

You'd need to compile OpenSSL first (see the code sample Adobe made available for instructions on how to do that) and the zlib library.

Once you get the basic stuff compiled, you'd probably want to start hacking the C code a bit, as Alchemy's libc doesn't implement network-related commands yet. Also, calls to the zlib library should be replaced by builtin ByteArray methods where possible, to make things faster.

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12. matthewbmedia,

Dec 15, 2008 9:15 AM in reply to matthewbmedia

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Metalbot -

Thanks for your work on this. We might have a breakthrough... With the latest build of Alchemy, your test Files to encode a 2400x2400 bytearray have jumped from 18 seconds to 1.5 seconds on my machine!!! woohoo. I need to do some real world tests to verify this, but I'm running into issues compiling the swc into my projects FLA... Can't seem to get the compiler to find the cmodule package. Does anyone have any tips for me? I am sure I am missing something obvious - If I am limited to only compiling via the command line flex compiler, what can i do to compile my existing FLA...

On a separate note, how would one go about making this encoder behave asynchronously? It would be nice to break it up into 10% chunks - Or would there be too much overhead in sending progress information from the C layer back through to the actionscript layer?

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13. joesteele,

Dec 15, 2008 1:04 PM in reply to matthewbmedia

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@matthewbmedia - You can use flyield() to release control back to Flash for processing events.
Here is an example from some code Scott wrote:

const int LoopSize = 20;

// don't let gcc inline you
void loopGuts(int loops) __attribute__((noinline));

// do the guts of the loop here -- unroll if you want
void loopGuts(int loops)
{
for(int j=0; j<loops; j++) {
// do a unit of processing
}
}

// here is your main looping routine
void bigLoop(int loops)
{
for(int i=0; i<loops; i++) {
if((loop % LoopSize) == 0)
flyield();
loopGuts(LoopSize);
}
}

The idea is that the inner "guts" routine will run synchronously and the outer routine will run asynchronously. Flash should be more responsive and you will still get most of the speed.

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14. Darrin M,

Dec 24, 2008 10:48 AM in reply to joesteele

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I inserted a flyield call into metalbot's as3_jpeg_wrapper.gg and it didn't appear to make any difference, either to the performance of the encoding or the responsiveness of the UI. Encoding still halts UI and rendering. I've made other successful changes so I think I'm building it right.

/* like reading a file, this time write one row at a time */
while( cinfo.next_scanline < cinfo.image_height )
{
row_pointer[0] = &raw_image24[ cinfo.next_scanline * cinfo.image_width * cinfo.input_components];
jpeg_write_scanlines( &cinfo, row_pointer, 1 );
flyield();
}

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15. matthewbmedia,

Jan 8, 2009 9:06 AM in reply to joesteele

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Thanks Joe for the tips -

Does anyone from the community want to take a stab at tweaking the CPU load of this jpeg encoder routine? It is soooo close to being a usable asset for us all.

Is there anything special about where a flyyield call needs to be placed for it to release a frame update to the flash end? Seems Ardnarf and I both are having issues implementing it into a while loop. I've added some checking to mine to iterate a counter and only run flyyield every 20 times through the loop - but it seems to have no effect.

Metalbot -

You also had a note in your C file read implementation about allocating memory on the file read, but never releasing it. What do you think would be the best thing to do here - is a manual call from the flash side needed to release / dispose of the file, or could something be placed at the end of the encode loop?

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16. joesteele,

Jan 8, 2009 9:59 AM in reply to matthewbmedia

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One additional bit -- Scott mentioned that the (noinline) attribute was not always working. You can tweak the gcc script in achacks to add your function to the $internsyms list. This should prevent the function from being inlined.

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17. ethan1el,

Feb 5, 2009 3:31 AM in reply to matthewbmedia

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Guys, I am interesting in hiring a freelancer to make me this kind of flash applet. The basics required will be - resize before upload using this method (Alchemy + IJQ lib), ability to rotate and preview before upload.

How much will it cost me? And is there anyone here interested to help me with this project?

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18. Bog Imp,

Feb 15, 2009 7:18 PM in reply to metalbot

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Hello
(Sorry if noob questions)
But i trying make work jpeg-6b on my pc but i have problems, can you help me?
i have Win XP, simple test like "samples/stringecho/" or smth else work fine(compile c to swc).

But when i try compile "jpeg-6b" i am stuck
what i do:
1.unpack
2.open cygwin
3.cd to folder and run
$./configure
4.wait all is ok i have "Makefile"
5 when i try run
$make
i have troubles with
"$ make
MAKE Version 5.2 Copyright (c) 1987, 1998 Inprise Corp.
rm -f libjpeg.a
ar rc libjpeg.a jcapimin.o jcapistd.o jctrans.o jcparam.o jdatadst.o j
cinit.o jcmaster.o jcmarker.o jcmainct.o jcprepct.o jccoefct.o jccolor.o jcsam
ple.o jchuff.o jcphuff.o jcdctmgr.o jfdctfst.o jfdctflt.o jfdctint.o jdapimi
n.o jdapistd.o jdtrans.o jdatasrc.o jdmaster.o jdinput.o jdmarker.o jdhuff.o j
dphuff.o jdmainct.o jdcoefct.o jdpostct.o jddctmgr.o jidctfst.o jidctflt.o j
idctint.o jidctred.o jdsample.o jdcolor.o jquant1.o jquant2.o jdmerge.o jcomap
i.o jutils.o jerror.o jmemmgr.o jmemnobs.o
/usr/bin/ar: jcapimin.o: No such file or directory

** error 1 ** deleting libjpeg.a"
Can you help me ?
Also where i must take "jcapimin.o" and who must generate "jpeg.l.bc".

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19. notnick,

Feb 16, 2009 5:13 AM in reply to Bog Imp

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try this option
1.open cygwin

quote:

tar xvf jpegsrc.v6b.tar.gz

2.cd jpeg-6b

quote:

alc-on;./configure CFLAGS='-E';alc-off
alc-on;make CFLAGS='-O3';alc-off
alc-on;make clean;alc-off

take jpeg.l.bc in the directory - /jpeg-6b

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20. Bog Imp,

Feb 16, 2009 5:17 AM in reply to notnick

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when i run
$alc-on;make CFLAGS='-O3';alc-off

i have
Bog Imp@imp /cygdrive/c/alchemy/samples/as3_encoder_jpeg/jpeg-6b
$ alc-on;make CFLAGS='-O3';alc-off
MAKE Version 5.2 Copyright (c) 1987, 1998 Inprise Corp.
rm -f libjpeg.a
ar rc libjpeg.a jcapimin.o jcapistd.o jctrans.o jcparam.o jdatadst.o j
cinit.o jcmaster.o jcmarker.o jcmainct.o jcprepct.o jccoefct.o jccolor.o jcsam
ple.o jchuff.o jcphuff.o jcdctmgr.o jfdctfst.o jfdctflt.o jfdctint.o jdapimi
n.o jdapistd.o jdtrans.o jdatasrc.o jdmaster.o jdinput.o jdmarker.o jdhuff.o j
dphuff.o jdmainct.o jdcoefct.o jdpostct.o jddctmgr.o jidctfst.o jidctflt.o j
idctint.o jidctred.o jdsample.o jdcolor.o jquant1.o jquant2.o jdmerge.o jcomap
i.o jutils.o jerror.o jmemmgr.o jmemnobs.o
/usr/bin/ar: jcapistd.o: No such file or directory

** error 1 ** deleting libjpeg.a

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21. notnick,

Feb 16, 2009 7:04 AM in reply to matthewbmedia

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Check compiler:
alc-on;gcc --help;alc-off
that there can be seen?

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22. notnick,

Feb 16, 2009 7:10 AM in reply to Bog Imp

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if before doing. / configure
in the beginning, do make clean : alc-on;make clean;alc-off

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23. Bog Imp,

Feb 16, 2009 7:31 AM in reply to matthewbmedia

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$ alc-on;gcc --help;alc-off
Usage: llvm-gcc [options] file...
Options:
-pass-exit-codes Exit with highest error code from a phase
--help Display this information
--target-help Display target specific command line options
(Use '-v --help' to display command line options of sub-processes)
-dumpspecs Display all of the built in spec strings
-dumpversion Display the version of the compiler
-dumpmachine Display the compiler's target processor
-print-search-dirs Display the directories in the compiler's search path

****

after that i try

Bog Imp@imp /cygdrive/c/alchemy/samples/as3_encoder_jpeg/jpeg-6b
$ alc-on;make clean;alc-off
MAKE Version 5.2 Copyright (c) 1987, 1998 Inprise Corp.
rm -f *.o *.lo libjpeg.a libjpeg.la
rm -f cjpeg djpeg jpegtran rdjpgcom wrjpgcom
rm -f ansi2knr core testout* config.log config.status
rm -f -r knr .libs _libs

Bog Imp@imp /cygdrive/c/alchemy/samples/as3_encoder_jpeg/jpeg-6b
$ alc-on;make;alc-off
MAKE Version 5.2 Copyright (c) 1987, 1998 Inprise Corp.
rm -f libjpeg.a
ar rc libjpeg.a jcapimin.o jcapistd.o jctrans.o jcparam.o jdatadst.o j
cinit.o jcmaster.o jcmarker.o jcmainct.o jcprepct.o jccoefct.o jccolor.o jcsam
ple.o jchuff.o jcphuff.o jcdctmgr.o jfdctfst.o jfdctflt.o jfdctint.o jdapimi
n.o jdapistd.o jdtrans.o jdatasrc.o jdmaster.o jdinput.o jdmarker.o jdhuff.o j
dphuff.o jdmainct.o jdcoefct.o jdpostct.o jddctmgr.o jidctfst.o jidctflt.o j
idctint.o jidctred.o jdsample.o jdcolor.o jquant1.o jquant2.o jdmerge.o jcomap
i.o jutils.o jerror.o jmemmgr.o jmemnobs.o
/usr/bin/ar: jcapimin.o: No such file or directory

** error 1 ** deleting libjpeg.a

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24. Bog Imp,

Feb 16, 2009 9:29 AM in reply to Bog Imp

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Sorry for my offtope but i have problem with make its my delphi he also have "Make"
in result i try use delphi make in Cygwin
if you have mak and response
MAKE Version 5.2 Copyright (c) 1987, 1998 Inprise Corp.
Fatal: Unable to open makefile
It's delphi.
Now i install make from devel folder
seems work all corrects.....

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25. piolo96,

Feb 17, 2009 12:36 PM in reply to notnick

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hi Notnick I followed what you mentioned on post 46 and everything ran just right.
I was wondering what the next step for this to build the .swc file I need would be.
what am I suppose to do with the jpeg.l.bc in the directory - /jpeg-6b

Thanks so much for all the help.

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26. notnick,

Feb 17, 2009 9:46 PM in reply to piolo96

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Depending on the purpose:
if you write own module on Alchemy - С/C ++ for example example.c. Then use for compilation in SWC.
alc-on;gcc example.c -O3- Wall -swc -o example.swc -L.../jpeg-6b -ljpeg;alc-off
But if you ask in a theme context - look above...
The post from - Metalbot.There is a link on archive with an example and is used - Makefile.

quote:

There it is written - GLUEGEN a file (a mix "C(Alchemy)" and "AS3") with extention *.gg and accordingly all will be on another. Look an example at Metalbot and it Makefile

Process in this case the such:
It is taken separately "С" a part from gluegen *.gg a file - glue.c and AS3 a part glue.as
And in SWC it is compiled only - glue.c
glue.as It is used as a class in AS3.

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27. piolo96,

Feb 20, 2009 2:11 PM in reply to matthewbmedia

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I tried doing what Metalbot sugested but as I went through it all and was on the last step to make the .swc file. This errors comes up:

===================================================
Macintosh-2:jpeg-6b userName$ make
gcc -o cjpeg cjpeg.o rdppm.o rdgif.o rdtarga.o rdrle.o rdbmp.o rdswitch.o cdjpeg.o libjpeg.a
ld warning: in cjpeg.o, file is not of required architecture
ld warning: in rdppm.o, file is not of required architecture
ld warning: in rdgif.o, file is not of required architecture
ld warning: in rdtarga.o, file is not of required architecture
ld warning: in rdrle.o, file is not of required architecture
ld warning: in rdbmp.o, file is not of required architecture
ld warning: in rdswitch.o, file is not of required architecture
ld warning: in cdjpeg.o, file is not of required architecture
ld warning: in libjpeg.a, file is not of required architecture
Undefined symbols:
"_main", referenced from:
start in crt1.10.5.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make: *** [cjpeg] Error 1
===================================================

Step 5 when it says to run make. That is when the error comes up.

thanks in advance for any help.

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28. notnick,

Feb 20, 2009 3:51 PM in reply to piolo96

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Open a file in HEX editor, for example cjpeg.o -- The first two bytes must be 00000000h: 42 43; or in text two simbol - BC.
This is necessary. LLVM unnecessarily just to understand its format.
How did you met -. / Configure?
Have alc-on; with this?

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29. piolo96,

Feb 25, 2009 10:25 AM in reply to matthewbmedia

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I followed the following:
Download jpegsrc.v6b.tar.gz
Through terminal I ran the following lines:
tar xvf jpegsrc.v6b.tar.gz
cd jpeg-6b
alc-on;./configure CFLAGS='-E';alc-off
alc-on;make CFLAGS='-O3';alc-off
alc-on;make clean;alc-off

After this steps I followed the steps on the Metabolt link.
Make a new directory jpeg
take jpeg.l.bc in the directory - /jpeg
Go on to the directory jpeg
run the following:
cd ../jpeg-6b
make

After this I get the error that I already mentioned in the last post.
I did open the file jpeg.l.bc on a HEX Editor and got the (42, 43) which in symbol would be BC at the beginning

Any suggestions on what I am doing wrong? Any help would be greatly appreciated.

Thanks for all the help.

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30. notnick,

Feb 27, 2009 2:02 AM in reply to piolo96

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Sorry for the Mac may be what is the option(
I will try later on MAC OS)
try to install VirtualBox with Ubuntu8.10 and it works there fine.

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31. myMacromediaScreenName,

Feb 28, 2009 12:09 PM in reply to matthewbmedia

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radScientist, Metalbot

Confirming approximately 1.5 sec on a Windows dual core 2.1 GHz.

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32. notnick,

Mar 1, 2009 1:11 PM in reply to piolo96

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Today checked alchemy to MAKOSX-leo10.5
Everything works fine
The latest version of Xcode 3.1.2
i686-apple-darwin9-gcc-4.0.1
perl, v5.8.8
java version "1.5.0_16"
Edit the file: / private / etc / bashrc
PATH=/Users/tester/flex_sdk_3/bin:$ALCHEMY_HOME/achacks:$PATH
source /Users/tester/alchemy/alchemy-setup

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33. MB2,

Mar 1, 2009 5:05 PM in reply to matthewbmedia

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For us here just joining the thread could we get a summary of what is working (and what is not working) on the jpeg encoder port / build with Alchemy on Windows? Perhaps an overview of what stage the port is at? Working, or not... -MB

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34. notnick,

Mar 2, 2009 4:11 AM in reply to MB2

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You can port the library from source http://www.ijg.org/files/, in LLVM c help - alchemy sdk (on any OS-mac, windows, linux), and connect to jpeg.l.bc project alchemy.
For example - you can take the archive from Metalbot (see above) and try.
This example works and converts Bitmap array of jpeg.
How fast compared to AS3/Alchemy? a little faster:)
But speed - This is the main goal.
Alchemy has not yet been released. Let's wait for improvements, and especially support for multithreading - today, this important function is turned off. Why? Let us ask the support ... to the MAX2007 is shown;)

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35. piolo96,

Mar 3, 2009 11:04 AM in reply to myMacromediaScreenName

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Thanks notnick for all that, hey myMacromediaScreenName you mentioned you were able to successfully test the jpeg lib, I was wondering if you could share with us the c file you used to compile the swc. I been trying something here and there but haven't gotten any results yet. thanks a lot

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36. notnick,

Mar 4, 2009 12:39 PM in reply to piolo96

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This is a project of Metalbot
file included
i am change in make flag -O5
test results
AS3 JPEG ENCODING: 606ms.
jpg.length = 2362
setting up as3_jpeg_wrapper library
C JPEG ENCODING: 206ms.

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37. piolo96,

Mar 11, 2009 9:15 AM in reply to matthewbmedia

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great example notnick thank you very much. did you ever run into a problem with the jpeg_std_error().

Undefined sym: _jpeg_std_error
at <anonymous>()
at <anonymous>()
at com.hurlant.jpeg::as3_jpeg_wrapper$/write_jpeg_file()[/Users/user/Doc uments/Flex Builder 3/jpegTest/src/com/hurlant/jpeg/as3_jpeg_wrapper.as:8]
at jpegTest/testWrite()[/Users/user/Documents/Flex Builder 3/jpegTest/src/jpegTest.mxml:32]
at jpegTest/___jpegTest_Button1_click()[/Users/user/Documents/Flex Builder 3/jpegTest/src/jpegTest.mxml:44]

I tried this example with your swc then I went and compiled it myself to double check. When I did, I ran into this. I made sure I had my jpeg-6b library installed and on the right path and everything looks right, I dont have any error in the moment of compiling. thank you

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38. notnick,

Mar 11, 2009 10:56 AM in reply to piolo96

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I do not compile in Flex project.Actionscript project is only. SWC does not require libraries.
This is the fully compiled.

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39. piolo96,

Mar 11, 2009 3:37 PM in reply to matthewbmedia

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I am not sure I understand what you are saying. Once the SWC is compiled I use it on my Flash / Flex projects. You mean you did not use the jpeg library on your project? I think you did because on the .gg file you have the line in which you include the jpeg lib (#include <jpeglib.h>) and then you are using this dealing with the ByteArray you pass into it through the write_jpeg_file method. Does that make any sense? My issue is that even though I do include this file and it seems to be working correctly, for some reason I have some limits on using it because I can't use any methods that this is supposed to bring in.
Thank you.

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