[FFmpeg-trac] #3495(swscale:new): Call to sws_getCachedContext() with SWS_BICUBLIN will always raise an assert exception
FFmpeg
trac at avcodec.org
Tue Mar 25 14:01:43 CET 2014
#3495: Call to sws_getCachedContext() with SWS_BICUBLIN will always raise an
assert exception
------------------------------------+-----------------------------------
Reporter: cyril | Owner:
Type: defect | Status: new
Priority: important | Component: swscale
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
------------------------------------+-----------------------------------
Comment (by cyril):
I already explained how to reproduce the bug programmatically:
{{{
#include <libswscale/swscale.h>
void main() {
SwsContext *pSwsContext = NULL;
sws_getCachedContext(pSwsContext,
720, 406,AV_PIX_FMT_YUV420P,
256, 144, AV_PIX_FMT_BGRA,
SWS_BICUBLIN, NULL, NULL, NULL
);
}
}}}
I don't know how to send a patch, but in libswscale/utils.c, replace the
below lines:
{{{
281 static const ScaleAlgorithm scale_algorithms[] = {
282 { SWS_AREA, "area averaging", 1 /*
downscale only, for upscale it is bilinear */ },
283 { SWS_BICUBIC, "bicubic", 4 },
284 { SWS_BICUBLIN, "luma bicubic / chroma bilinear", -1 },
285 { SWS_BILINEAR, "bilinear", 2 },
286 { SWS_FAST_BILINEAR, "fast bilinear", -1 },
287 { SWS_GAUSS, "Gaussian", 8 /*
infinite ;) */ },
288 { SWS_LANCZOS, "Lanczos", -1 /*
custom */ },
289 { SWS_POINT, "nearest neighbor / point", -1 },
290 { SWS_SINC, "sinc", 20 /*
infinite ;) */ },
291 { SWS_SPLINE, "bicubic spline", 20 /*
infinite :)*/ },
292 { SWS_X, "experimental", 8 },
293 };
}}}
by
{{{
281 static const ScaleAlgorithm scale_algorithms[] = {
282 { SWS_AREA, "area averaging", 1 /*
downscale only, for upscale it is bilinear */ },
283 { SWS_BICUBIC, "bicubic", 4 },
284 { SWS_BILINEAR, "bilinear", 2 },
285 { SWS_BICUBLIN, "luma bicubic / chroma bilinear", -1 },
286 { SWS_FAST_BILINEAR, "fast bilinear", -1 },
287 { SWS_GAUSS, "Gaussian", 8 /*
infinite ;) */ },
288 { SWS_LANCZOS, "Lanczos", -1 /*
custom */ },
289 { SWS_POINT, "nearest neighbor / point", -1 },
290 { SWS_SINC, "sinc", 20 /*
infinite ;) */ },
291 { SWS_SPLINE, "bicubic spline", 20 /*
infinite :)*/ },
292 { SWS_X, "experimental", 8 },
293 };
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3495#comment:2>
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