How to replace JPEG codec with our own hw codec?

[liang ming-chuan]

hi,

 

I would like to replace the android jpeg codec with our own hw codec,
would anybody tell me where to start from?

Thanks in advance for your help.

 

Robert

[Jim Huang]

2009/12/29 liang ming-chuan <lmc8...@gmail.com>:

> I would like to replace the android jpeg codec with our own hw codec,
> would anybody tell me where to start from?
> Thanks in advance for your help.
>

hi Robert,

Please check the wiki:
https://gforge.ti.com/gf/project/omapandroid/wiki/?pagename=Package+and+Release+Notes

Audio Decoder, Audio Encoder, Video Encoder, Audio/Video Decoder and
JPEG Decoder
Change list:

/hardware/ti/omap3/libskiahw/Android.mk
/hardware/ti/omap3/libskiahw/SkImageDecoderTest?.cpp
/hardware/ti/omap3/libskiahw/SkImageDecoder?_libtijpeg.cpp
/hardware/ti/omap3/libskiahw/SkImageDecoder?_libtijpeg.h
/hardware/ti/omap3/libskiahw/SkImageEncoderTest?.cpp
/hardware/ti/omap3/libskiahw/SkImageEncoder?_libtijpeg.cpp
/hardware/ti/omap3/libskiahw/SkImageEncoder?_libtijpeg.h

You can refer to the modifications from OMAPZoom Android.

Sincerely,
Jim Huang (jserv)
http://0xlab.org/

[liang ming-chuan]

Thanks for your quickly response..^_^

On Tue, Dec 29, 2009 at 4:37 PM, Jim Huang <jserv.tw@gmail.com> wrote:

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[liang ming-chuan]

hi,

I'm studying how the JPEG codec register with android system.

The sw JPEG codec seems register with android system by following code:

 

    static SkTRegistry<SkImageDecoder*, SkStream*> gDReg(DFactory);

but I couldn't found how OMAP register with android system, I found the code in omap android:

    SkImageDecoder_HWJPEG_Factory();

but doesn't found any body call this function.

do you known how the OMAP register jpeg codec with android system?

and, how the generated libskiahw.so is link with android system?

 

Besides, I found the code in OMAP hw jpeg codec seems link to OpenMax:

    eError = TIOMX_GetHandle(&pOMXHandle, strTIJpegDec, (void *)this, &JPEGCallBack);

    ....

Why OMAP hw jpeg codec link to OpenMAX? does it has any advantage? Could I just replace the code in sw jpeg with some code calling hw directly?

Does any one who want to write a hw jpeg codec should follow the sample in OMAP to write a correct one?

 

The OMAP hw jpeg codec is too complex for me, and I even not familiar with OpenMAX..>_<

 

Thanks in andvance for your help.

[liang ming-chuan]

>and, how the generated libskiahw.so is link with android system?

I just found the TIOMX_GetHandle() will call dlopen() to load .so

[Gary Wang]

Dear all,

Any advice on following this question?

I also have the same question: how the TI own hw jpeg codec (i.e. libskiahw.so) be resisted when using following 

SkImageDecoder* decoder = SkImageDecoder::Factory(stream);

I can't found any part related to its codec registration.

static SkTRegistry<SkImageDecoder*, SkStream*> gDReg(DFactory);

static SkTRegistry<SkImageEncoder*, SkImageEncoder::Type> gEReg(EFactory);

Thanks!

Sincerely, ~Gary Wang~
Facebook: http://www.facebook.com/crazygary
Albums: www.flickr.com/photos/garywang2007/, photo.xuite.net/zcwang
Twitter: http://twitter.com/garywang
Plurk: http://www.plurk.com/garywang

On Mon, Jan 11, 2010 at 11:26 AM, liang ming-chuan <lmc83.tw@gmail.com> wrote:

>and, how the generated libskiahw.so is link with android system?

I just found the TIOMX_GetHandle() will call dlopen() to load .so

[Deva R]

codec component lists are prepared from /etc/<omx-componets>.cfg files..
make sure you rename yours as 0001_<my-omx>.cfg, so as to be picked first.

PS.
this thread talks about multiple OMX codecs
http://groups.google.com/group/android-porting/browse_thread/thread/04f3060352c1d1af/4dc14413d98a6b95

On Thu, Apr 1, 2010 at 11:42 AM, Gary Wang <zcw...@gmail.com> wrote:
> Dear all,
> Any advice on following this question?
> I also have the same question: how the TI own hw jpeg codec
> (i.e. libskiahw.so) be resisted when using following
> SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
> I can't found any part related to its codec registration.
> static SkTRegistry<SkImageDecoder*, SkStream*> gDReg(DFactory);
> static SkTRegistry<SkImageEncoder*, SkImageEncoder::Type> gEReg(EFactory);
> Thanks!
> Sincerely, ~Gary Wang~
> Facebook: http://www.facebook.com/crazygary
> Albums: www.flickr.com/photos/garywang2007/, photo.xuite.net/zcwang
> Twitter: http://twitter.com/garywang
> Plurk: http://www.plurk.com/garywang
>
>

> On Mon, Jan 11, 2010 at 11:26 AM, liang ming-chuan <lmc8...@gmail.com>

[Chih-Wei]

I checked my nexus one and found a file
$ cat /etc/01_qcomm_omx.cfg
(0xa054369c,0x22c5,0x412e,0x19,0x17,0x87,0x4c,0x1a,
0x19,0xd4,0x5f),"libqcomm_omx.so"

Could you explain what does it mean? Thank you.

On 4月1日, 下午3時10分, Deva R <r.deva...@gmail.com> wrote:
> codec component lists are prepared from /etc/<omx-componets>.cfg files..
> make sure you rename yours as 0001_<my-omx>.cfg, so as to be picked first.
> PS.

> this thread talks about multiple OMX codecshttp://groups.google.com/group/android-porting/browse_thread/thread/0...

[Deva R]

Hi,

> $ cat /etc/01_qcomm_omx.cfg
> (0xa054369c,0x22c5,0x412e,0x19,0x17,0x87,0x4c,0x1a,
> 0x19,0xd4,0x5f),"libqcomm_omx.so"
> Could you explain what does it mean? Thank you.

The .cfg file contrains ('api id for OMX interface', 'library name')..
More details can be found in PV Core OMX integartion guide..
Link: http://git.omapzoom.org/?p=patch/platform/external/opencore.git;a=tree;f=doc
->omx_core_integration_guide.pdf
it will be handy for u, provided that u work on adding a new codec

>>I also have the same question: how the TI own hw jpeg codec (i.e. libskiahw.so) be resisted when using following

> $ cat /etc/01_qcomm_omx.cfg
> (0xa054369c,0x22c5,0x412e,0x19,0x17,0x87,0x4c,0x1a,
> 0x19,0xd4,0x5f),"libqcomm_omx.so"

Are you sure about qcomm OMX libraries, provided you are working on TI
h/w codec??

TI OMX libraries are available at
http://android.git.kernel.org/?p=platform/hardware/ti/omap3.git;a=tree;f=omx

and probably the config parser u should have is,
http://android.git.kernel.org/?p=platform/hardware/ti/omap3.git;a=blob;f=omx/core_plugin/01_Vendor_ti_omx.cfg

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>

[Deva R]

>>>I also have the same question: how the TI own hw jpeg codec (i.e. libskiahw.so) be resisted when using following
>> $ cat /etc/01_qcomm_omx.cfg
>> (0xa054369c,0x22c5,0x412e,0x19,0x17,0x87,0x4c,0x1a,
>> 0x19,0xd4,0x5f),"libqcomm_omx.so"
> Are you sure about qcomm OMX libraries, provided you are working on TI
> h/w codec??

my bad.. they're from different authors!!! i just wish no one's blocked :-)