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am caad0a5c: Merge "Support for vanilla YUV420sp => RGB565 color conversion." into gingerbread

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Merge commit 'caad0a5c6318678902402362df1791d286636344' into gingerbread-plus-aosp

* commit 'caad0a5c6318678902402362df1791d286636344':
  Support for vanilla YUV420sp => RGB565 color conversion.
This commit is contained in:
Andreas Huber
2010-06-30 15:33:09 -07:00
committed by Android Git Automerger
parent 6db0ef09c4 caad0a5c63
commit 86405cbd53
2 changed files with 73 additions and 0 deletions
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5
include/media/stagefright/ColorConverter.h
View File

@@ -58,6 +58,11 @@ private:
const void *srcBits, size_t srcSkip,
void *dstBits, size_t dstSkip);
void convertYUV420SemiPlanar(
size_t width, size_t height,
const void *srcBits, size_t srcSkip,
void *dstBits, size_t dstSkip);
ColorConverter(const ColorConverter &);
ColorConverter &operator=(const ColorConverter &);
};

68
media/libstagefright/colorconversion/ColorConverter.cpp
View File

@@ -42,6 +42,7 @@ bool ColorConverter::isValid() const {
case OMX_COLOR_FormatYUV420Planar:
case OMX_COLOR_FormatCbYCrY:
case OMX_QCOM_COLOR_FormatYVU420SemiPlanar:
case OMX_COLOR_FormatYUV420SemiPlanar:
return true;
default:
@@ -71,6 +72,11 @@ void ColorConverter::convert(
width, height, srcBits, srcSkip, dstBits, dstSkip);
break;
case OMX_COLOR_FormatYUV420SemiPlanar:
convertYUV420SemiPlanar(
width, height, srcBits, srcSkip, dstBits, dstSkip);
break;
default:
{
CHECK(!"Should not be here. Unknown color conversion.");
@@ -279,6 +285,68 @@ void ColorConverter::convertQCOMYUV420SemiPlanar(
}
}
void ColorConverter::convertYUV420SemiPlanar(
size_t width, size_t height,
const void *srcBits, size_t srcSkip,
void *dstBits, size_t dstSkip) {
CHECK_EQ(srcSkip, 0); // Doesn't really make sense for YUV formats.
CHECK(dstSkip >= width * 2);
CHECK((dstSkip & 3) == 0);
uint8_t *kAdjustedClip = initClip();
uint32_t *dst_ptr = (uint32_t *)dstBits;
const uint8_t *src_y = (const uint8_t *)srcBits;
const uint8_t *src_u =
(const uint8_t *)src_y + width * height;
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; x += 2) {
signed y1 = (signed)src_y[x] - 16;
signed y2 = (signed)src_y[x + 1] - 16;
signed v = (signed)src_u[x & ~1] - 128;
signed u = (signed)src_u[(x & ~1) + 1] - 128;
signed u_b = u * 517;
signed u_g = -u * 100;
signed v_g = -v * 208;
signed v_r = v * 409;
signed tmp1 = y1 * 298;
signed b1 = (tmp1 + u_b) / 256;
signed g1 = (tmp1 + v_g + u_g) / 256;
signed r1 = (tmp1 + v_r) / 256;
signed tmp2 = y2 * 298;
signed b2 = (tmp2 + u_b) / 256;
signed g2 = (tmp2 + v_g + u_g) / 256;
signed r2 = (tmp2 + v_r) / 256;
uint32_t rgb1 =
((kAdjustedClip[b1] >> 3) << 11)
| ((kAdjustedClip[g1] >> 2) << 5)
| (kAdjustedClip[r1] >> 3);
uint32_t rgb2 =
((kAdjustedClip[b2] >> 3) << 11)
| ((kAdjustedClip[g2] >> 2) << 5)
| (kAdjustedClip[r2] >> 3);
dst_ptr[x / 2] = (rgb2 << 16) | rgb1;
}
src_y += width;
if (y & 1) {
src_u += width;
}
dst_ptr += dstSkip / 4;
}
}
uint8_t *ColorConverter::initClip() {
static const signed kClipMin = -278;
static const signed kClipMax = 535;