[FFmpeg-trac] #3240(undetermined:new): sws_getCachedContext() fail on very small resize to(below 8x8)

[FFmpeg]

#3240: sws_getCachedContext() fail on very small resize to(below 8x8)
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             Reporter:  vovach777     |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  2.1.1
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 Summary of the bug:

 function sws_getCachedContext() fail on very small resize to(below 8x8)

 How to reproduce:
 {{{

 FF_API int ff_scale(ScaleContext ctx)
 {
 //1920x1080 -> BGRA 8x8
 //SWS_FAST_BILINEAR => raise devide by ziro
 //SWS_BILINEAR => returns - NULL;
     ctx->_sws = sws_getCachedContext(ctx->_sws,
 ctx->src_width,ctx->src_height,ctx->src_format,
 ctx->dst_width,ctx->dst_height,ctx->dst_format,
 SWS_FAST_BILINEAR,NULL,NULL,NULL);
     if (!ctx->_sws)
         return -1;

     return sws_scale(ctx->_sws, ctx->src_data,
                   ctx->src_linesize, 0, ctx->src_height, ctx->dst_data,
 ctx->dst_linesize);
 }

 ffmpeg version

 #define FFMPEG_CONFIGURATION "--enable-cross-compile
 --yasmexe=yasm-1.2.0-win32.exe --disable-avdevice --disable-doc --disable-
 hwaccels --arch=x86 --target-os=win32 --disable-optimizations --assert-
 level=2 --enable-debug=3 --disable-programs --disable-w32threads
 --prefix='C:/ffmpeg32/dev'"

 version 2.1
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3240>
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