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

[GizmoSDK]

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...

/Anders Mod?n