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Add support for NV12 video frames

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This was encountered on a recent Android device.
This commit is contained in:
Milian Wolff 2016-12-19 11:31:55 +01:00
parent 75b1a0d355
commit 69e05c1ff1
1 changed files with 39 additions and 15 deletions
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54
examples/QZXingLive/QZXingFilter.cpp
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@ -4,13 +4,24 @@
#include <QtConcurrent/QtConcurrent>
namespace {
uchar gray(uchar r, uchar g, uchar b)
{
return (306 * (r & 0xFF) +
601 * (g & 0xFF) +
117 * (b & 0xFF) +
0x200) >> 10;
}
uchar gray(uchar r, uchar g, uchar b)
{
return (306 * (r & 0xFF) +
601 * (g & 0xFF) +
117 * (b & 0xFF) +
0x200) >> 10;
}
uchar yuvToGray(uchar Y, uchar U, uchar V)
{
const int C = (int) Y - 16;
const int D = (int) U - 128;
const int E = (int) V - 128;
return gray(
qBound(0, (298 * C + 409 * E + 128) >> 8, 255),
qBound(0, (298 * C - 100 * D - 208 * E + 128) >> 8, 255),
qBound(0, (298 * C + 516 * D + 128) >> 8, 255)
);
}
}
QZXingFilter::QZXingFilter(QObject *parent)
@ -166,14 +177,27 @@ void QZXingFilterRunnable::processVideoFrameProbed(SimpleVideoFrame & videoFrame
const uchar Y = data[Y_offset + x];
const uchar U = data[U_offset + x_2];
const uchar V = data[V_offset + x_2];
const int C = (int) Y - 16;
const int D = (int) U - 128;
const int E = (int) V - 128;
*pixel = gray(
qBound(0, (298 * C + 409 * E + 128) >> 8, 255),
qBound(0, (298 * C - 100 * D - 208 * E + 128) >> 8, 255),
qBound(0, (298 * C + 516 * D + 128) >> 8, 255)
);
*pixel = yuvToGray(Y, U, V);
++pixel;
}
}
}
// nv12 format, encountered on macOS
if(image.isNull() && videoFrame.pixelFormat == QVideoFrame::Format_NV12) {
image = QImage(videoFrame.size, QImage::Format_Grayscale8);
uchar* pixel = image.bits();
const uchar* y_data = data;
const uchar* uv_data = data + (height * width);
for (int y = 0; y < height; y++) {
const int w_y_2 = width * int(y / 2); // floored half-y
for (int x = 0; x < width; x++) {
const uchar Y = *y_data;
const int uv_index = (w_y_2 + x / 2) * 2;
const uchar U = uv_data[uv_index];
const uchar V = uv_data[uv_index + 1];
y_data++;
*pixel = yuvToGray(Y, U, V);
++pixel;
}
}