IMGENC1_control problem with jpeg encoder

Sandro

Prodigy 130 points

Hello,

I modified the DMAI image_encode_io sample to change some settings of the jpeg encoder.

My changes:

#include <ti/sdo/codecs/jpegenc/ijpegenc.h>

....

Void appMain(Args * args)
{
    int ret = 0, i = 0;
    IJPEGENC_DynamicParams dynJpgParams;
    IJPEGENCQtab            qTab; /* quantization tab */
    IMGENC1_Handle            hImgEnc        = NULL;
    IMGENC1_Status            imgStatus;

....
....

    for(i = 0; i < 64; i++){
        qTab.luma[i] = 0x55;
        qTab.chroma[i] = 0xaa;
    }

hImgEnc = Ienc1_getVisaHandle(hIe);

    dynParams.size = sizeof(IJPEGENC_DynamicParams);
    dynJpgParams.imgencDynamicParams = dynParams;
    dynJpgParams.rstInterval                        = 84; // default 84
    dynJpgParams.disableEOI                            = 0; // default 0
    dynJpgParams.rotation                            = 270; // can be 0 (default), 90, 180, 270

// dynJpgParams.customQ = &qTab; // default NULL
dynJpgParams.customQ = NULL; // default NULL

imgStatus.size = sizeof(imgStatus);

ret = IMGENC1_control(hImgEnc, IJPEGENC_SETPARAMS, (IIMGENC1_DynamicParams *)&dynJpgParams, &imgStatus);

....

Rotating the image works fine, but I can't set my own quantization tab (no error message).
Instead the first 20 values in my quantization tab (qTab) are changed by IMGENC1_control() to
0x...00 00 00 00 00 00 00 00 b4 d2 0d 41 00 00 00 00 00 00 00 00- even if I set customQ to NULL.

If I look at the pointers, I see the following paritioning:

imgStatus|qTab|dynJpgParams

Is there something wrong in my code?
Is there a bug in the jpeg encoder?
Is anybody able to set a user defined quantization tab?

S. Stiller

over 16 years ago

0 Anshuman Saxena over 16 years ago

TI__Mastermind 19985 points

Hi Sandro,

Please add the following code to send control command for setting up Q Table after your below lines of code

>> ret = IMGENC1_control(hImgEnc, IJPEGENC_SETPARAMS, (IIMGENC1_DynamicParams *)&dynJpgParams, &imgStatus);

    status = IMGENC1_control(hEncode, JPEGENC_TI_ENCODE_SETCUSTOMQ, (IIMGENC1_DynamicParams *)&dynJpgParams, &imgStatus);
    if (status != VIDENC1_EOK) {
      printf("\n JPEG SETERROR in customQ\n");
        return FAILURE;
}

Regards,

Anshuman

0 Sandro over 16 years ago in reply to Anshuman Saxena

Prodigy 130 points

Hello Anshuman,

thank you for the hint, now I can set the quantization tab.

I found the following enum in the ijpegenc.h:

43 typedef enum {
44   JPEGENC_TI_ENCODE_SETPREPROC= XDM_GETBUFINFO + 1,
45   JPEGENC_TI_ENCODE_SETOVERLAY,
46   JPEGENC_TI_ENCODE_SETCUSTOMQ,
47   JPEGENC_TI_ENCODE_ABORT
48 } JPEGENC_TI_ENCODE_ExtCmdId;

But can't find any documentation how to use the different values of JPEGENC_TI_ENCODE_ExtCmdId.
(e.g. JPEGENC_TI_ENCODE_SETOVERLAY seems to be interesting)

And I still have the problem that

IMGENC1_control(hImgEnc, IJPEGENC_SETPARAMS, (IIMGENC1_DynamicParams *)&dynJpgParams, &imgStatus);

writes to my memory (if I want to rotate the image).

regards,

Sandro

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IMGENC1_control problem with jpeg encoder