[FFmpeg-user] How to correctly free a double-linked list

[Paul B Mahol]

On 7/7/19, Ulf Zibis <Ulf.Zibis at gmx.de> wrote:
>
> Am 07.07.19 um 14:29 schrieb Paul B Mahol:
>> On 7/7/19, Ulf Zibis <Ulf.Zibis at gmx.de> wrote:
>>> Am 07.07.19 um 13:51 schrieb Paul B Mahol:
>>>> There is av_calloc, it calls memset for you after allocation
>>> Thanks for the hint. I now have:
>>>     if (s->report >= R_SHIFTS) {
>>>         s->shifts_sums = av_malloc((s->lines + 1) *
>>> sizeof(*s->shifts_sums));
>> This above needs to be calloc.
>
> Unfortunately this doesn't help. So I ask:

Maybe:

s->shifts_sums = av_calloc(s->lines + 1, sizeof(**s->shifts_sums));

>
> Isn't this enough initialization? :
>         for (int l = s->lines; l >= 0; l--)
>             s->shifts_sums[l] = av_calloc(s->span_r - s->span_l + 1,
> sizeof(**s->shifts_sums));
> I don't get, why I first should write NULLs into the elements of
> s->shifts_sums[l].
>
> -Ulf
>
>
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