Am 12.5.2011 16:09, schrieb Dmitriy K:
Is there any examples of this conversion?
I've found YUV_TO_RGB1 and YUV_TO_RGB2 in libavcodec/colorspace.h in
documentation, but there is no this file in my system.
The right library is swscale, which is part of libav. For sample code
have a look at output-example.c (in the path of libav). To convert the
pixelformat first the source and destination format have to be
initialized with
img_convert_ctx = sws_getContext(c->width, c->height,
PIX_FMT_YUV420P,
c->width, c->height,
c->pix_fmt,
sws_flags, NULL, NULL, NULL);
look at the documentation for the variables:
http://ffmpeg.org/doxygen/trunk/swscale_8h.html#4d840b451d893c2cc27eec5fd1fada96
for every picture you have to converted the following function is used:
sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize, 0,
c->height, picture->data, picture->linesize);
All things that have to do with integer variables, overflows and other
stuff are handled by the library, so it works very well.
Steffen
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