[Libav-user] Color space conversion

[Jasleen Kaur]

I am using sws_scale to change the color space of the image buffer.

Source data is in BGRA and destination color space is YUV420(12 bit).

The code snippet for conversion is -

void Convert(int iWidth, int iHeight, BYTE* pBGRABuff)

{

int ystride = iWidth;

int uvstride = iWidth / 2;

int ysize = ystride * iHeight;

int vusize = uvstride * ( iHeight / 2 );

int size = ysize + ( 2 * vusize );

if(g_sws_ctx == NULL)

{

g_sws_ctx = sws_getContext(iWidth,

iHeight,

AV_PIX_FMT_BGRA,

iWidth, iHeight,

AV_PIX_FMT_YUV420P,

SWS_FAST_BILINEAR, 0, 0, 0);

m_picture_buf = (uint8_t*)malloc(size);

}

uint8_t *plane[] = { m_picture_buf, m_picture_buf + ysize, m_picture_buf + ysize + vusize, 0 };

int stride[] = { ystride, uvstride, uvstride, 0 };

uint8_t *inData[1] = { pARGBBuff };

int inLinesize[1] = { 4 * iWidth};

sws_scale(g_sws_ctx, inData, inLinesize, 0, iHeight, plane, stride );

}

The problem I am facing is that the colours are not right in the converted image.

What is the problem with the above code?

Attaching the snapshot of the source and destination images.

-Jasleen
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