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avfilter/vf_scale: fix interlaced chroma for other formats 

This logic only covers the case of yuv420p. Extend this logic to cover
*all* vertically subsampled YUV formats, which require the same
interlaced scaling logic.

Fortunately, we can get away with re-using the same code for both JPEG
and MPEG range YUV, because the only difference here is the horizontal
alignment. (Which I omit touching for now, to avoid introducing possibly
unintended changes in default behavior)
This commit is contained in:
Niklas Haas 2023-10-13 14:31:57 +02:00
parent d799ad2404
commit 2d1aeba8f2
1 changed files with 7 additions and 5 deletions
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12
libavfilter/vf_scale.c
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@ -518,6 +518,7 @@ static int config_props(AVFilterLink *outlink)
outlink->src->inputs[0];
enum AVPixelFormat outfmt = outlink->format;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const AVPixFmtDescriptor *outdesc = av_pix_fmt_desc_get(outfmt);
ScaleContext *scale = ctx->priv;
uint8_t *flags_val = NULL;
int ret;
@ -588,14 +589,15 @@ static int config_props(AVFilterLink *outlink)
av_opt_set_int(s, "dst_range",
scale->out_range == AVCOL_RANGE_JPEG, 0);
/* Override YUV420P default settings to have the correct (MPEG-2) chroma positions
* MPEG-2 chroma positions are used by convention
* XXX: support other 4:2:0 pixel formats */
if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
/* Override chroma location default settings to have the correct
* chroma positions. MPEG chroma positions are used by convention.
* Note that this works for both MPEG-1/JPEG and MPEG-2/4 chroma
* locations, since they share a vertical alignment */
if (desc->log2_chroma_h == 1 && scale->in_v_chr_pos == -513) {
in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
if (outdesc->log2_chroma_h == 1 && scale->out_v_chr_pos == -513) {
out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}