[Ffmpeg-devel] swscaler BUG in PIX_FMT_YUV410P -> PIX_FMT_RGBA32

[Michael Niedermayer]

Hi

On Mon, Feb 19, 2007 at 10:11:07PM +0100, GizmoSDK wrote:
> 
> 19 feb 2007 kl. 21.45 skrev GizmoSDK:
> 
> >When converting a image of format PIX_FMT_YUV410P to  
> >PIX_FMT_RGBA32, using MMX but not MMX2 the blue rgb component is  
> >mixed into the green so a blue image gets green.
> >
> >The context is initialised with
> >
> >			m_img_convert_ctx = sws_getContext( 
> >			m_pVideoCodecCtx->width,  m_pVideoCodecCtx->height,
> >												PIX_FMT_RGBA32,
> >												m_pVideoCodecCtx->width, m_pVideoCodecCtx->height,
> >												m_pVideoCodecCtx->pix_fmt,
> >												0, NULL, NULL, NULL);
> >
> >and the conversion is done with
> >
> >sws_scale(m_img_convert_ctx, m_pFrame->data, m_pFrame->linesize,0,  
> >m_pVideoCodecCtx->height, m_pFrameRGB->data, m_pFrameRGB->linesize);
> >
> >The size of src==dst so its a plain translation of format A to B.
> >
> >This bug occurs in
> >FFmpeg version SVN-r8028, Copyright (c) 2000-2007 Fabrice Bellard,  
> >et al.
> >  configuration: --disable-opts --disable-strip --enable-swscaler -- 
> >enable-xvid --enable-libfaad --extra-cflags=-I/Users/amo/ 
> >xvidcore-1.1.0/src -I/Users/amo/faad2/include --enable-gpl --extra- 
> >ldflags=-L/Users/amo/xvidcore-1.1.0/build/generic/=build -L/Users/ 
> >amo/faad2/libfaad/.libs --disable-dv1394 --disable-ipv6 --disable- 
> >vhook --disable-bktr --disable-v4l2 --disable-v4l
> >  libavutil version: 49.3.0
> >  libavcodec version: 51.33.0
> >  libavformat version: 51.10.0
> >  built on Feb 19 2007 20:26:15, gcc: 4.0.1 (Apple Computer, Inc.  
> >build 5367)
> 
> I suspect that the error is in swscale_template.c:1107
> 
> switch(c->dstFormat)
> 	{
> 	case PIX_FMT_RGB32:
>                                 YSCALEYUV2PACKEDX
> 				YSCALEYUV2RGBX
> 				WRITEBGR32(%4, %5, %%REGa)
>                                 YSCALEYUV2PACKEDX_END
> 		return;
> 
> 
> where the rgb gets mangled some how. But its just a guess as all  
> these macros makes it virtually impossibly to debug without bettr  
> knowledge of the code...

mplayer -vf scale,format=YVU9,scale,format=bgr32,scale and rgb32 works
that is with mmx2 disabled
-> bug closed / not reproduceable

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In a rich man's house there is no place to spit but his face.
-- Diogenes of Sinope
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