csputils/vo_gl: rewrite YUV->RGB matrix generation

Rewrite the csputils.c code generating a conversion matrix for
YUV->RGB conversions (currently used by vo_gl only). Functional
differences:
- The separate "mplayer default" colorspace is removed, and BT.601 is
  used instead (the default colorspace was in fact BT.601; see below).
- The old code was missing chroma scaling. As a result the "mplayer
  default" colorspace actually mapped to BT.601, and everything else
  was buggy (I guess the other colorspaces were added with particular
  coefficient semantics, without understanding that the original
  "default colorspace" was actually BT.601 and why its coefficients
  differed from the added version).
- The old code had a bug in the equalizer hue equations.
- The old code assumed that for specifying whether input and output
  were limited-range or full-range YUV or RGB it would make sense to
  specify "no conversion" meaning full-range YUV to full-range RGB or
  limited-range YUV to limited-range RGB. This isn't true; limited-
  range YUV has different ranges for luma and chroma (16-235
  vs 16-240) which means you have to scale chroma for limited->limited
  conversions. The new code assumes limited->limited conversions for
  the levelconv parameter 2. It'd probably make sense to change the
  API later to specify the ranges of input and output separately.
- The undocumented EBU and XYZ colorspaces are removed. I doubt any
  videos use these. Also the EBU colorspace looks like it'd expect
  a different input range - at least no input would map to full RGB
  red as it was.

1 files changed, 1 insertions, 3 deletions

diff --git a/libvo/csputils.h b/libvo/csputils.h
index 64b23b3d57..93f9ca0316 100644
--- a/libvo/csputils.h
+++ b/libvo/csputils.h
@@ -31,15 +31,13 @@ enum mp_csp_standard {
     MP_CSP_BT_601,
     MP_CSP_BT_709,
     MP_CSP_SMPTE_240M,
-    MP_CSP_EBU,
-    MP_CSP_XYZ,
     MP_CSP_COUNT
 };
 
 enum mp_csp_levelconv {
     MP_CSP_LEVELCONV_TV_TO_PC,
     MP_CSP_LEVELCONV_PC_TO_TV,
-    MP_CSP_LEVELCONV_NONE,
+    MP_CSP_LEVELCONV_TV_TO_TV,
     MP_CSP_LEVELCONV_COUNT
 };