365 JPEG Encoder, is it possible not to generate Restart Markers?

Cristiano Belloni

Hi to all, i'm using Dvsdk v. 2.10.01.18 on DM365 with DM365 Codecs v 01.00.06.

My question is very specific; Jpeg encoder in old DM355 did not create JPEG images with restart markers (0xFF 0xD0, 0xD1 ... 0xD7).

Now that we migrated to the DM365, the JPEG Encoder automatically uses them, even if I'm not making a sliced-image encoding. (My dynamic parameters are like that):

dynParams-> numAU = XDM_DEFAULT;
dynParams->inputChromaFormat = XDM_YUV_420SP;
dynParams->inputHeight = height;
dynParams->inputWidth = width;
dynParams->captureWidth = 0;
dynParams->generateHeader = XDM_ENCODE_AU;
dynParams->qValue = quality;

The problem is that our JPEG/RTP implementation does not currently support JPEG images with restart markers. Is there a way to tell DM365 JPEG encoder not to use them and behave like DM355 Codec?

Regards,

Cristiano.

over 14 years ago

0 Akshay Panday over 14 years ago

Expert 1640 points

Hi,

If you set the rstInterval equal to the number of AUs you have, then there will be no restart markers inserted in the encoded stream. Please note, however, that the DRI marker in the header (0xFFDD) will still be there.

You can also refer to a similar conversation about restart markers. http://e2e.ti.com/support/embedded/f/356/p/63110/229013.aspx#229013

Hope this helps.

Regards,

Akshay

0 Cristiano Belloni over 14 years ago in reply to Akshay Panday

Intellectual 290 points

Dear Akshay,

- numAU for me is 0, as I don't use encoder slicing. But rtsInterval minimum value is 3, from the user guide. This means I *must* use encoder slicing if I don't want to have restart markers in my JPEG?

- I use DMAI. Is there a way to set the extended parameters, like,rtsInterval, with DMAI?

0 Akshay Panday over 14 years ago in reply to Cristiano Belloni

Expert 1640 points

Cristiano,

No, nothing to do with the numAU parameter, but the actual number of AUs in the image.

The default is 84, so it puts a restart marker every 84 blocks. For example, a QVGA image would have 300 AUs, so setting rstInterval to 300 will avoid any marker insertion in the encoded data, since it'll run out of blocks before it can put the marker. You can keep numAU=0 for all this, shouldn't be a problem.

About DMAI, I'm don't have that clarity. I'll have to get back to you.

Regards,

Akshay

0 Cristiano Belloni over 14 years ago in reply to Akshay Panday

Intellectual 290 points

Ok, I look forward for you answer on DMAI + extended parms, thank you for now!

Best Regards,

Cristiano.

0 Yashwant Dutt over 14 years ago in reply to Cristiano Belloni

TI__Genius 17215 points

Cristiano,

Extending DMAI happens in the same way as extending CE interface. You can get some info at - http://processors.wiki.ti.com/index.php/Extending_data_structures_in_xDM

You can also check "video.c" file of DM365 decode demo, it has extended the H.264 decoder interface.

regards

Yashwant

Processors

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365 JPEG Encoder, is it possible not to generate Restart Markers?