[FFmpeg-devel] [PATCH 5/5] avcodec/utils: simplify, remove duplicate code

[lance.lmwang at gmail.com]

On Thu, Apr 30, 2020 at 03:18:15PM +0200, Andreas Rheinhardt wrote:
> lance.lmwang at gmail.com:
> > From: Limin Wang <lance.lmwang at gmail.com>
> > 
> > Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> > ---
> >  libavcodec/utils.c | 29 +++--------------------------
> >  1 file changed, 3 insertions(+), 26 deletions(-)
> > 
> > diff --git a/libavcodec/utils.c b/libavcodec/utils.c
> > index e77090daef..91b271a717 100644
> > --- a/libavcodec/utils.c
> > +++ b/libavcodec/utils.c
> > @@ -584,37 +584,14 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
> >      avctx->internal = avci;
> >  
> >      avci->to_free = av_frame_alloc();
> > -    if (!avci->to_free) {
> > -        ret = AVERROR(ENOMEM);
> > -        goto free_and_end;
> > -    }
> > -
> >      avci->compat_decode_frame = av_frame_alloc();
> > -    if (!avci->compat_decode_frame) {
> > -        ret = AVERROR(ENOMEM);
> > -        goto free_and_end;
> > -    }
> > -
> >      avci->buffer_frame = av_frame_alloc();
> > -    if (!avci->buffer_frame) {
> > -        ret = AVERROR(ENOMEM);
> > -        goto free_and_end;
> > -    }
> > -
> >      avci->buffer_pkt = av_packet_alloc();
> > -    if (!avci->buffer_pkt) {
> > -        ret = AVERROR(ENOMEM);
> > -        goto free_and_end;
> > -    }
> > -
> >      avci->ds.in_pkt = av_packet_alloc();
> > -    if (!avci->ds.in_pkt) {
> > -        ret = AVERROR(ENOMEM);
> > -        goto free_and_end;
> > -    }
> > -
> >      avci->last_pkt_props = av_packet_alloc();
> > -    if (!avci->last_pkt_props) {
> > +    if (!avci->to_free      || !avci->compat_decode_frame ||
> > +        !avci->buffer_frame || !avci->buffer_pkt          ||
> > +        !avci->ds.in_pkt    || !avci->last_pkt_props) {
> >          ret = AVERROR(ENOMEM);
> >          goto free_and_end;
> >      }
> > 
> If you write this in the following way
> 
> if (!(avci->to_free = av_frame_alloc())             ||
>     !(avci->compat_decode_frame = av_frame_alloc()) || ...) {
>     ret = AVERROR(ENOMEM);
>     goto free_and_end;
> }
> 
> then shortcircuit evaluation will make sure that an error is detected
> immediately (like now), but without the code duplication.

Yeah, it's better, I'll update it.

> 
> - Andreas
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-- 
Thanks,
Limin Wang