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vf_scale: avoid a pointless memcpy in no-op conversion. 

I.e. just pass the buffer along when src parameters == dst parameters.
This commit is contained in:
Anton Khirnov 2012-03-29 07:02:27 +02:00
parent 63736fe48c
commit 416fd90ead
1 changed files with 20 additions and 5 deletions
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25
libavfilter/vf_scale.c
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@ -213,11 +213,16 @@ static int config_props(AVFilterLink *outlink)
if (scale->sws)
sws_freeContext(scale->sws);
scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
outlink->w, outlink->h, outlink->format,
scale->flags, NULL, NULL, NULL);
if (!scale->sws)
return AVERROR(EINVAL);
if (inlink->w == outlink->w && inlink->h == outlink->h &&
inlink->format == outlink->format)
scale->sws = NULL;
else {
scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
outlink->w, outlink->h, outlink->format,
scale->flags, NULL, NULL, NULL);
if (!scale->sws)
return AVERROR(EINVAL);
}
if (inlink->sample_aspect_ratio.num)
@ -241,6 +246,11 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
AVFilterLink *outlink = link->dst->outputs[0];
AVFilterBufferRef *outpicref;
if (!scale->sws) {
avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
return;
}
scale->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
scale->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
@ -267,6 +277,11 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
AVFilterBufferRef *cur_pic = link->cur_buf;
const uint8_t *data[4];
if (!scale->sws) {
avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
return;
}
if (scale->slice_y == 0 && slice_dir == -1)
scale->slice_y = link->dst->outputs[0]->h;