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| author | Darren Salt <linux@youmustbejoking.demon.co.uk> | 2012-02-15 00:47:40 +0000 |
|---|---|---|
| committer | Darren Salt <linux@youmustbejoking.demon.co.uk> | 2012-02-15 00:47:40 +0000 |
| commit | 061c58a5d30290c29f25044cbe9bdcf00364f333 (patch) | |
| tree | b7776008ddd1c42dc910b2433f1a669e1808181a /src/xine-utils/xineutils.h | |
| parent | 9622af14dfe4a43f45084b560624aa44e611d8f8 (diff) | |
| download | xine-lib-061c58a5d30290c29f25044cbe9bdcf00364f333.tar.gz xine-lib-061c58a5d30290c29f25044cbe9bdcf00364f333.tar.bz2 | |
Improved RGB→YUV conversion v2 (use MPEG range instead of full range)
Video-out plugins expect MPEG range Y'CbCr data (Y'=16..235, Cb,Cr=16..240).
RGB sources (still images and audio visualisation effects) need to be
converted first.
This patch fixes up the range calculations and corrects an off-by-one in the
range for Cb and Cr over commit 68fcd69fb3b6 (which was reverted due to API
change). It should also provide a little more accuracy: I've gone back to
the source (http://www.itu.int/rec/R-REC-BT.601/) for the conversion
information.
(We should use float or double here, but that would be an ABI change.)
Diffstat (limited to 'src/xine-utils/xineutils.h')
| -rw-r--r-- | src/xine-utils/xineutils.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/xine-utils/xineutils.h b/src/xine-utils/xineutils.h index 5b16e6e3c..cbf88aeaf 100644 --- a/src/xine-utils/xineutils.h +++ b/src/xine-utils/xineutils.h @@ -291,6 +291,9 @@ extern void (*yuy2_to_yv12) #define SCALEFACTOR 65536 #define CENTERSAMPLE 128 +/* These conversions are normalised for the MPEG Y'CbCr colourspace. + * (Yes, we know that we call it YUV elsewhere.) + */ #define COMPUTE_Y(r, g, b) \ (unsigned char) \ ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR) |