> -----Original Message----- > From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of Nicolas > George > Sent: 2021年3月1日 21:57 > To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> > Subject: Re: [FFmpeg-devel] [PATCH V3 3/3] libavfilter: add filter dnn_detect > for object detection > > Andreas Rheinhardt (12021-03-01): > > > thanks for the info, this struct is expected to be in side_data in > > > the future, I'll add 'bboxes[1]' in it, and allocate sizeof(*header) + > > > (nb_bbox > - 1) * sizeof(*bbox). > > > > Notice that in this case it is undefined behaviour to access any of > > the boxes outside of BoundingBoxHeader (i.e. when using > > header->bboxes[i], the compiler is allowed to infer that i == 0 as all > > other cases would be undefined behaviour). > > Are you sure about it? Can you quote the standard? > > Anyway, even if this is true, we can work around it with an extra pointer or a > cast, possibly wrapped in a macro. Saving a few dynamic allocation is well > worth the unusual code;
Hi, glad to hear there's a good solution, could you share a bit of code as an example, it would be nice if I could refine my code better when possible, thanks. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
