[FFmpeg-devel] MPEG-PS demuxer index memory usage
Sat Jan 5 13:55:43 CET 2008
Trent Piepho <xyzzy at speakeasy.org> writes:
> On Fri, 4 Jan 2008, [iso-8859-1] M?ns Rullg?rd wrote:
>> > - memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index));
>> > + memmove(&entries[index + 1], &entries[index], sizeof(AVIndexEntry)*(st->nb_index_entries - index));
>> Those two lines are exactly equivalent. In C, the construct a[b] can
>> always be replaced by ((a) + (b)) and conversely. This means that the
> You mean "*((a) +(b))" replaces "a[b]", or "&a[b]" replaces "((a)+(b))", of
Yes, of course.
>> first argument to the above memmove() call could be written
>> &index[entries]+1, or even &1[entries]+index, should one feel thusly
> I don't think &1[entries]+index would work. 1[entries] is dereferencing an
> integer, which should be an error, but might be just a warning under some
> compiler/options/c standard combinations. Maybe you meant
> "&entries+index", which would work.
Try it. It really works.
mans at mansr.com
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