[FFmpeg-devel] [RFC] lavu PTS printing utils

[Stefano Sabatini]

On date Sunday 2012-01-15 16:36:35 +0100, Nicolas George encoded:
> Le sextidi 26 nivôse, an CCXX, Stefano Sabatini a écrit :
> >     return ts == (AV_NOPTS_VALUE) ? snprintf(buf, buf_size, "NOPTS") :
> >                                     snprintf(buf, buf_size, "%"PRId64"", ts);
> 
> Note that the return value is not the room taken in the buffer but the size
> that the text would have used if there was enough room.
> 
> > Do you think this would be a good idea? If yes, where should I put them
> > (libavutil/printutils.h may be an option)?
> 
> As Reimer points out, I fear it would lack flexibility for some purposes.
> But for quick debugging it may be useful.
> 
> As a side note, I would like to share the following trick that I have used
> in some programs of mine:
> 
> char *foo2str_buf(char *buf, size_t buf_size, foo_t foo) {
>     <convert>
>     return buf;
> }
> 
> #define foo2str(foo) foo2str_buf((char[42]){ 0 }, 42, foo)
> 
> with 42 a constant chosen to be large enough: that way, I can write:
> 
> 	printf("a = %s\n", foo2str(a));
> 
> and the buffer to convert is allocated with automatic storage.

Updated based on this, with example code.
-- 
FFmpeg = Frenzy Freak MultiPurpose Extravagant Guide
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