> 2020年4月8日 下午10:48，Nicolas George <geo...@nsup.org> 写道： > > Steven Liu (12020-04-08): >> I cannot get the mean of BPrint where should or when should use it, maybe >> you can introduce it, >> I always think BPrint is used to instead of av_[a]sprintf, >> because I saw mkver submit 3 patches to modify from snprintf to BPrint > > BPrint brings three benefits: > > - It keeps track of the string length. It is therefore useful when you > have several snprintf(). If you have only one, this benefit is > negated. > > - It switches to dynamic allocation if the buffer is too small. If your > string does not have a bounded size and keeping it entirely is > important, then replacing a buffer with an arbitrary high limit with > BPrint is useful. > > - Before switching to dynamic allocation, it uses a local buffer in the > structure (probably on stack). If the string does not need to outlive > its creation very far, it works. If we need to keep the string, a > dynamic allocation is necessary anyway. > > For this case: (1) there is only one snprintf(), (2) we don't use a > fixed-size buffer and (3) we'll keep the string.
very clear, I understand it now, Thanks Nicolas. > > Regards, > > -- > Nicolas George Thanks Steven Liu _______________________________________________ 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".
