Hi, I am having some trouble converting from YUYV to RGB format - it
crashes in sws_scale. I am guessing I am not filling pFrame below
properly. I use pFrame to fill in the data pointer and strides to pass
to swscale function.
AVFrame *pFrameRGB=NULL;
AVFrame *pFrame;
pFrame = avcodec_alloc_frame();
int size = avpicture_get_size(pMediaInfo->ff_pixFormat,
ww, hh); //(this is to verify - accurately gets correct size fora
YUYV frame -
//matches with the number of bytes
i am passing)
pFrame->data[0] = pMediaInfo->src; //src contains the RAW
image frame read with V4L2 reader function,
//here i am just assigning the pointer to AVFrame variable.
pFrame->linesize[0]=ww*2; //src width in bytes
pFrame->linesize[1]=0;
pFrame->linesize[2]=0;
pFrame->linesize[3]=0;
pFrameRGB = avcodec_alloc_frame();
int numRGBBytes = ww * hh * 4; //src width * src height * 4
buffer = malloc (sizeof(uint8_t)*numRGBBytes);
if ( avpicture_fill((AVPicture *)pFrameRGB, buffer,
PIX_FMT_RGB24, ww, hh) <= 0 ) //this essentially assigns allocated
data pointer to pFrameRGB->data
{
error = AV_PICFILL;
break;
}
if(pOGLContext->img_convert_ctx == NULL)
{
pOGLContext->img_convert_ctx = sws_getContext(ww, hh,
pMediaInfo->ff_pixFormat,
ww, hh, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
if(pOGLContext->img_convert_ctx == NULL)
{
error = SWSCALE_INITERR;
break;
}
}
int ret = sws_scale(pOGLContext->img_convert_ctx,
(uint8_t**)pFrame->data, pFrame->linesize, 0, hh, pFrameRGB->data,
pFrameRGB->linesize);
if(ret == -1)
{
error = SWSCALE_ERROR;
break;
}
If anybody could give me some insight, that would be good. Thanks
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