[Ffmpeg-devel] [PATCH] ported SGI decoder to the new API

[Baptiste Coudurier]

Hi

Michael Niedermayer wrote:
> Hi
> 
> On Tue, Apr 03, 2007 at 08:09:35PM +0800, Xiaohui Sun wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Michael Niedermayer wrote:
>>> Hi
>>>
>>> On Tue, Apr 03, 2007 at 12:46:36AM +0800, Xiaohui Sun wrote:
>>>> I have updated the patch.
>> [...]
>>>> +            if (expand_rle_row(in_buf + start_offset, end_buf, dest_row,
>>>> +                dest_row + s->linesize, z, s->depth) != s->width)
>>>> +                return AVERROR_INVALIDDATA;
>>> linesize can be negative
>> I am sorry but I am not quite clear about the meaning of negative
>> linesize and found not much code/comment on it.
>> I wonder if the linesize is negative, then the
>> p->data[0] is the end address of the image buffer and the start address
>>  is p->data[0] + (avctx->height - 1) * p->linesize[0]?
> 
> yes

By curiosity, why is it used/useful ?

-- 
Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
SMARTJOG S.A.                                    http://www.smartjog.com
Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
Phone: +33 1 49966312