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From: Niklas Haas <ffmpeg@haasn.xyz>
To: ffmpeg-devel@ffmpeg.org
Date: Mon, 17 Mar 2025 11:43:50 +0100
Message-ID: <20250317104357.307832-4-ffmpeg@haasn.xyz>
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Subject: [FFmpeg-devel] [PATCH 04/11] tests/swscale: use yuva444p as
reference
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From: Niklas Haas <git@haasn.dev>
Instead of the lossy yuva420p. This does change the results compared to the
status quo, but is more reflective of the actual strength of a conversion,
since it will faithfully measure the round-trip error from subsampling and
upsampling.
---
libswscale/tests/swscale.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/libswscale/tests/swscale.c b/libswscale/tests/swscale.c
index 3f140f51f7..8db5ee0af5 100644
--- a/libswscale/tests/swscale.c
+++ b/libswscale/tests/swscale.c
@@ -82,7 +82,7 @@ static int fmt_comps(enum AVPixelFormat fmt)
static void get_mse(int mse[4], const AVFrame *a, const AVFrame *b, int comps)
{
- av_assert1(a->format == AV_PIX_FMT_YUVA420P);
+ av_assert1(a->format == AV_PIX_FMT_YUVA444P);
av_assert1(b->format == a->format);
av_assert1(b->width == a->width && b->height == a->height);
@@ -90,8 +90,8 @@ static void get_mse(int mse[4], const AVFrame *a, const AVFrame *b, int comps)
const int is_chroma = p == 1 || p == 2;
const int stride_a = a->linesize[p];
const int stride_b = b->linesize[p];
- const int w = (a->width + is_chroma) >> is_chroma;
- const int h = (a->height + is_chroma) >> is_chroma;
+ const int w = a->width;
+ const int h = a->height;
uint64_t sum = 0;
if (comps & (1 << p)) {
@@ -499,7 +499,7 @@ bad_option:
goto error;
ref->width = opts.w;
ref->height = opts.h;
- ref->format = AV_PIX_FMT_YUVA420P;
+ ref->format = AV_PIX_FMT_YUVA444P;
if (sws_scale_frame(sws[0], ref, rgb) < 0)
goto error;
--
2.48.1
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