Problem with DevVideo API

[Digish]

Hi ,

I have seen that Nokia is providing MMF DevVideoRecord API as part of plug-in pack.

But I am facing too many issues with the API. I really doubt that for what reason they have given this API as a free one?

With the API I have found a very basic problem in devvideobase.h that they are providing following class,

class TPictureData
{
public:
/**
The image data format. The validity of the rest of the fields depends on the data format used.
*/
TImageDataFormat iDataFormat;

/**
Image data size in pixels. In decoder output pictures the actual active picture area may be smaller,
this is indicated using TVideoPicture.iCropRect.
*/
TSize iDataSize;

union
{
/**
Pointer to raw image data. Valid if iDataFormat is ERgbRawData or iYuvRawData.
The data layout depends on the format used.
*/
TPtr8* iRawData;

/**
Pointer to an RGB bitmap. Valid if iDataFormat is ERgbFbsBitmap.
*/
CFbsBitmap* iRgbBitmap;
};
};

As per my understanding, this clearly means that there is no way to access either iRawData or iRgbBitmap.

Tell me if I am wrong.

If this is the case, then how can one person use this class? and withour using this class, It will not be possible to initialize H.264 encoder which is not supporting direct camera input.

If there is any solution, please help...

Experts: If this is just an API which is useless, if possible, please make some note somewhere so that it can save time of other developers till they find this kind of dead-end.

Thanks,
Digish

[Sorcery-ltd]

Hi,

I think you are wrong - this is just an anonymous union. You can treat it as if the union didn't exist and its members are just normal members of the class from a syntax perspective. The only difference is that you mustn't use both of them at the same time, just one format or the other.

Mark

[Digish]

Thanks very much for the help!

-Digish

[skumar_rao]

But it is giving me compilation errors.

what error you are getting. can you show us you command window output.

[Digish]

Hi skumar_rao,

Thanks for quick response...

I actually was getting some other error which was on the same line so i thought of it being error because of it.

aneways, thanks for help... it was just my mistake.

By the way,

I tried following code.

	TUncompressedVideoFormat lUncompressedVideoFormat;

//	TSize					 lInputPictureSize(640,480);
//	TSize					 lInputPictureSize(352,288);
	TSize					 lInputPictureSize(176,144);
	
	lUncompressedVideoFormat.iDataFormat = EYuvRawData;
	TYuvFormat lYuvFormat;

	TYuvCoefficients lCoef = EYuvRange1;
	TYuvSamplingPattern lPattern = EYuv420Chroma3;
	TYuvDataLayout lDataLayout = EYuvDataPlanar;
	
	lYuvFormat.iCoefficients = lCoef;
	lYuvFormat.iPattern = lPattern;
	lYuvFormat.iDataLayout = lDataLayout;
	lYuvFormat.iRgb2YuvMatrix = NULL;
	lYuvFormat.iYuv2RgbMatrix = NULL;
	lYuvFormat.iAspectRatioNum = 1;
	lYuvFormat.iAspectRatioDenom = 1;
	
	lUncompressedVideoFormat.iYuvFormat = lYuvFormat; 
	
	TRAPD(err2,iRecord->SetInputFormatL(iEncoderId,lUncompressedVideoFormat,lInputPictureSize););
	
	LOG(_L("Set input formate err = %d "),err2);
	if(err2 != KErrNone) break;

But I am getting continuosly err -5 .

and hence I am not able to initialize my H.264 encoder.

I had set

TBuf8<60> lMime(_L8("video/H264; profile-level-id=42900B"));
TBuf8<60> lMime(_L8("video/H264; profile-level-id=42800A"));
TBuf8<60> lMime(_L8("video/H264"));

one by one for trial to find out proper encoder but in not even single case,
I got any success.

Can anyone please help me?

-Thanks,
Digish

[Digish]

Replying my own post so others can get around if needed.

I had to set EYuvBt709Range1 in place of

TYuvCoefficients lCoef = EYuvRange1;

Now initialization is not creating problem

Thanks
-Digish

[Digish]

Hello friends,

Here I am facing a different problem but still as it is related, I am continueing in the same thread.

After initialization, when I am writing video data through,

iRecord->WritePictureL(iPicture);

I am getting no errors but there is no data being encoded.

When I am retriving buffer status,

iRecord->NumDataBuffers()

It always returns 0.

My MdvroNewBuffers() is never being called.

iRecord->NextBufferL();

Always returns NULL

and

iRecord->GetOutputBufferStatus(lbuffers,lbytes);

always returns same value, 2 buffers and 81942 bytes.


I am not able to get what should i try now..

please help!

-Digish

[Cartouche67]

Hello Digish, there are always the same person on DevVideo API thread..
did you manage to use RGB like input format ?

[Damavik]

Hi, guys!
Has anyone managed to use built-in h.264 codec on the Nokia 5800? The problem is that I initialize successfully encoder for the video/h264 output, but after MdvroNewBuffers() is never being called. Tried to play around with SetGlobalReferenceOptions(), doesn't help