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Update Android to use limited range YCbCr.

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Limited range seems to be more used than full range and many Android
components already use limited range. This includes FileVideoCapturer,
VideoFileRenderer and HW codecs.

Bug: webrtc:9638
Change-Id: Iadd9b2f19020c6a25bde5e43a28e26a6230dde42
Reviewed-on: https://webrtc-review.googlesource.com/94543
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24576}
This commit is contained in:
Sami Kalliomäki
2018-09-05 11:43:38 +02:00
committed by Commit Bot
parent 548dec4a81
commit 8ccddff6ac
7 changed files with 82 additions and 63 deletions
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22
sdk/android/api/org/webrtc/YuvConverter.java
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@ -46,12 +46,24 @@ public class YuvConverter {
+ "}\n";
private static class ShaderCallbacks implements GlGenericDrawer.ShaderCallbacks {
// Y'UV444 to RGB888, see https://en.wikipedia.org/wiki/YUV#Y.27UV444_to_RGB888_conversion. We
// use the ITU-R coefficients for U and V.
private static final float[] yCoeffs = new float[] {0.2987856f, 0.5871095f, 0.1141049f, 0.0f};
// Y'UV444 to RGB888, see https://en.wikipedia.org/wiki/YUV#Y%E2%80%B2UV444_to_RGB888_conversion
// We use the ITU-R BT.601 coefficients for Y, U and V.
// The values in Wikipedia are inaccurate, the accurate values derived from the spec are:
// Y = 0.299 * R + 0.587 * G + 0.114 * B
// U = -0.168736 * R - 0.331264 * G + 0.5 * B + 0.5
// V = 0.5 * R - 0.418688 * G - 0.0813124 * B + 0.5
// To map the Y-values to range [16-235] and U- and V-values to range [16-240], the matrix has
// been multiplied with matrix:
// {{219 / 255, 0, 0, 16 / 255},
// {0, 224 / 255, 0, 16 / 255},
// {0, 0, 224 / 255, 16 / 255},
// {0, 0, 0, 1}}
private static final float[] yCoeffs =
new float[] {0.256788f, 0.504129f, 0.0979059f, 0.0627451f};
private static final float[] uCoeffs =
new float[] {-0.168805420f, -0.3317003f, 0.5005057f, 0.5f};
private static final float[] vCoeffs = new float[] {0.4997964f, -0.4184672f, -0.0813292f, 0.5f};
new float[] {-0.148223f, -0.290993f, 0.439216f, 0.501961f};
private static final float[] vCoeffs =
new float[] {0.439216f, -0.367788f, -0.0714274f, 0.501961f};
private int xUnitLoc;
private int coeffsLoc;