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Document BT.709 v210 conversion

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This commit is contained in:
Johanness
2026-05-24 21:17:44 +03:00
parent 22335bb378
commit f79eeadde6
2 changed files with 8 additions and 2 deletions
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PixelFormat.hpp
+5 -1
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@@ -95,6 +95,8 @@ inline void decodeV210Line(
default: y10 = y0; cb10 = cb0; cr10 = cr0; break; default: y10 = y0; cb10 = cb0; cr10 = cr0; break;
} }
// BT.709 limited-range YCbCr to RGB. v210 stores 10-bit video-range
// samples: Y [64, 940], Cb/Cr centered at 512.
int32_t yp = (static_cast<int32_t>(y10) - 64) >> 2; int32_t yp = (static_cast<int32_t>(y10) - 64) >> 2;
int32_t cbp = (static_cast<int32_t>(cb10) - 512) >> 2; int32_t cbp = (static_cast<int32_t>(cb10) - 512) >> 2;
int32_t crp = (static_cast<int32_t>(cr10) - 512) >> 2; int32_t crp = (static_cast<int32_t>(cr10) - 512) >> 2;
@@ -175,6 +177,8 @@ inline void convertV210ToRgba(
default: y10 = y0; cb10 = cb0; cr10 = cr0; break; default: y10 = y0; cb10 = cb0; cr10 = cr0; break;
} }
// BT.709 limited-range YCbCr to RGB. v210 stores 10-bit video-range
// samples: Y [64, 940], Cb/Cr centered at 512.
int32_t yp = (static_cast<int32_t>(y10) - 64) >> 2; int32_t yp = (static_cast<int32_t>(y10) - 64) >> 2;
int32_t cbp = (static_cast<int32_t>(cb10) - 512) >> 2; int32_t cbp = (static_cast<int32_t>(cb10) - 512) >> 2;
int32_t crp = (static_cast<int32_t>(cr10) - 512) >> 2; int32_t crp = (static_cast<int32_t>(cr10) - 512) >> 2;
@@ -187,4 +191,4 @@ inline void convertV210ToRgba(
{clampUint8(r), clampUint8(g), clampUint8(b)}); {clampUint8(r), clampUint8(g), clampUint8(b)});
} }
} }
} }
shaders/v210_decode.comp
+3 -1
View File
@@ -62,6 +62,8 @@ void main()
default: y10 = y5; cb10 = cb4; cr10 = cr4; break; default: y10 = y5; cb10 = cb4; cr10 = cr4; break;
} }
// BT.709 limited-range YCbCr to RGB. v210 stores 10-bit video-range
// samples: Y [64, 940], Cb/Cr centered at 512.
int yp = int(y10) - 64; int yp = int(y10) - 64;
int cbp = int(cb10) - 512; int cbp = int(cb10) - 512;
int crp = int(cr10) - 512; int crp = int(cr10) - 512;
@@ -79,4 +81,4 @@ void main()
b = clamp(b, 0, 255); b = clamp(b, 0, 255);
imageStore(dstImage, dstPos, vec4(float(r) / 255.0, float(g) / 255.0, float(b) / 255.0, 1.0)); imageStore(dstImage, dstPos, vec4(float(r) / 255.0, float(g) / 255.0, float(b) / 255.0, 1.0));
} }