Re: gif2webp in Java

[Urvang Joshi]

+WebP Discussion 

Hi Ahmad,

Unfortunately, libwebp.jar currently does not have JNI wrappers for mux.h APIs, which are required for creating an animated WebP.

One would have to add wrappers for mux APIs in this SWIG wrapper https://chromium.googlesource.com/webm/libwebp/+/master/swig/libwebp_java_wrap.c for that.

-Urvang

On Wed, Sep 21, 2016 at 1:45 PM Ahmad Al-Mughrabi <amug...@atypon.com> wrote:

Hi Urvang,

I would like to ask if there is a way to use gif2webp via JNI. I tried use the libwebp.jar that provided in webp api, but unfortunately with no luck to encode animated gif images, could you please guide me to reach this goal?

--

Sincerely,

Ahmad Al-Mughrabi.

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Thanks & Regards,

Urvang

[Urvang Joshi]

+jz...@google.com +WebP Discussion 

James wrote the JNI wrappers, so he'll be able to point you in the right direction.

On Thu, Sep 22, 2016 at 1:54 AM Ahmad Al-Mughrabi <amug...@atypon.com> wrote:

Thanks Urvang, I took a quick look to libwebp_java_wrap.c, and this file is automatically generated from swig tool. It seems libwebp.swig need to be modified and regenerating the JNI wrappers(compiled classes) to java/com/google/webp by using swig tool, then packaging the generated compile classes in new libwebp.jar. 

I see there are useful comments inside libwebp.swig about regenerating the JNI wrappers by using swig tool, but I'm not sure what should I modified inside libwebp.swig. Out of curiosity, Are you planning to provide Mux api in next release for webp? If not, could you please help me by providing a sample of code about the changes on libwebp.swig?

Many thanks, 

- Ahmad.  

[James Zern]

Hi,

On Thursday, September 22, 2016 at 8:47:37 AM UTC-7, Urvang Joshi wrote:

+jz...@google.com +WebP Discussion 

James wrote the JNI wrappers, so he'll be able to point you in the right direction.

On Thu, Sep 22, 2016 at 1:54 AM Ahmad Al-Mughrabi <amug...@atypon.com> wrote:

Thanks Urvang, I took a quick look to libwebp_java_wrap.c, and this file is automatically generated from swig tool. It seems libwebp.swig need to be modified and regenerating the JNI wrappers(compiled classes) to java/com/google/webp by using swig tool, then packaging the generated compile classes in new libwebp.jar. 

I see there are useful comments inside libwebp.swig about regenerating the JNI wrappers by using swig tool, but I'm not sure what should I modified inside libwebp.swig.

Out of curiosity, Are you planning to provide Mux api in next release for webp?

There's no one actively working on that, but we'd be happy to review patches that enabled the mux api.

 

If not, could you please help me by providing a sample of code about the changes on libwebp.swig?

swig documentation can be found on their site [1]. The mux api function calls would need to be added to the .swig file similar to what is done for the simple libwebp api. Another alternative, if you're not comfortable with swig, would be to add custom jni code to suit your use case.

[1] http://www.swig.org/doc.html