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lavfi/vflip: Support Bayer vertical flip. 

Fixes ticket #8819.
This commit is contained in:
Carl Eugen Hoyos 2020-09-05 21:14:01 +02:00
parent ca781761d6
commit 3490108f95
1 changed files with 34 additions and 0 deletions
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34
libavfilter/vf_vflip.c
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@ -33,6 +33,7 @@
typedef struct FlipContext {
const AVClass *class;
int vsub; ///< vertical chroma subsampling
int bayer;
} FlipContext;
static const AVOption vflip_options[] = {
@ -47,6 +48,7 @@ static int config_input(AVFilterLink *link)
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
flip->vsub = desc->log2_chroma_h;
flip->bayer = !!(desc->flags & AV_PIX_FMT_FLAG_BAYER);
return 0;
}
@ -74,11 +76,43 @@ static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
return frame;
}
static int flip_bayer(AVFilterLink *link, AVFrame *in)
{
AVFilterContext *ctx = link->dst;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
uint8_t *inrow = in->data[0], *outrow;
int i, width = outlink->w << (av_pix_fmt_desc_get(link->format)->comp[0].step > 1);
if (outlink->h & 1) {
av_log(ctx, AV_LOG_ERROR, "Bayer vertical flip needs even height\n");
return AVERROR_INVALIDDATA;
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
outrow = out->data[0] + out->linesize[0] * (outlink->h - 2);
for (i = 0; i < outlink->h >> 1; i++) {
memcpy(outrow, inrow, width);
memcpy(outrow + out->linesize[0], inrow + in->linesize[0], width);
inrow += 2 * in->linesize[0];
outrow -= 2 * out->linesize[0];
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
FlipContext *flip = link->dst->priv;
int i;
if (flip->bayer)
return flip_bayer(link, frame);
for (i = 0; i < 4; i ++) {
int vsub = i == 1 || i == 2 ? flip->vsub : 0;
int height = AV_CEIL_RSHIFT(link->h, vsub);