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| author | Doris Verria <doris.verria@qt.io> | 2023-04-25 23:19:10 +0200 |
|---|---|---|
| committer | Doris Verria <doris.verria@qt.io> | 2023-04-26 10:14:52 +0200 |
| commit | bd1487b17d0806a79cc74b911008a533e1ec3036 (patch) | |
| tree | e7c2935e8a8f5bbe410942dfe77c8344f8b27cc1 | |
| parent | ab6e93144a1153e0b53c9470bbd17956944e2d01 (diff) | |
| download | qtmultimedia-bd1487b17d0806a79cc74b911008a533e1ec3036.tar.gz | |
QVideoTextureHelper: Fix color matrix calculation
The color matrix for BT709 video (limited) range, had a small mistake.
From calculations based on the BT709 standard and for video range
(16 - 235) values, the conversion equations are:
R = Y * 1.1644 + V * 1.7928 + (-248.100994)
G = Y * 1.1644 + U * -0.2132 + V * -0.5329 + 76.878080
B = Y * 1.1644 + U * 2.1124 + (-289.017566)
So there was a missplacement between two of the coeficients
in the matrix.
Fixes: QTBUG-108083
Pick-to: 6.5 6.2
Change-Id: If58c7df8a9ad4d975a2ac0c90cd3692232210995
Reviewed-by: Lars Knoll <lars@knoll.priv.no>
| -rw-r--r-- | src/multimedia/video/qvideotexturehelper.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/multimedia/video/qvideotexturehelper.cpp b/src/multimedia/video/qvideotexturehelper.cpp index 7cb1e1a6e..3675e157f 100644 --- a/src/multimedia/video/qvideotexturehelper.cpp +++ b/src/multimedia/video/qvideotexturehelper.cpp @@ -398,7 +398,7 @@ static QMatrix4x4 colorMatrix(const QVideoFrameFormat &format) 0.0f, 0.000f, 0.000f, 1.0000f); return QMatrix4x4( 1.1644f, 0.000f, 1.7928f, -0.9731f, - 1.1644f, -0.5329f, -0.2132f, 0.3015f, + 1.1644f, -0.2132f, -0.5329f, 0.3015f, 1.1644f, 2.1124f, 0.000f, -1.1335f, 0.0f, 0.000f, 0.000f, 1.0000f); case QVideoFrameFormat::ColorSpace_BT2020: |