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SDL video

Started by mourya Feb 20, 2007 at 1:52 AM 2 replies 1k views

Original Post

Feb 20, 2007 at 1:52 AM

hi, i have a problem is SDL, i am decoding the video using avcodec_decode_video(videoCodec,prevFrame,&gotpics,pkt.data,pkt.size); then i heard that i have to copy the data into buffers so that i can lock, unlock and display the YUVoverlay. i dont know how to copy the data to the buffer. you guys have any idea about that

sevensevens

Feb 21, 2007 at 7:43 AM

you should be able to copy them using memcpy (just remember to check the 'pitch' of the surfaces, and copy one line at a time). Could you please clarify your post?

HolyGrail

Feb 21, 2007 at 6:27 PM

This an example taken from testwin.c given with SDL files:

SDL_Surface *screen

if ( SDL_LockSurface(screen) == 0 )
{
Uint32 black;
Uint8 *pixels;

black = SDL_MapRGB(screen->format, 0, 0, 0);
pixels = (Uint8 *)screen->pixels;
for ( i=0; ih; ++i ) {
memset(pixels, black,
screen->w*screen->format->BytesPerPixel);
pixels += screen->pitch;
}
SDL_UnlockSurface(screen);

sevensevens

Feb 21, 2007 at 10:51 PM

try replacing memset with memcpy (be sure to check 'black' to point to your video frame).

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