[SOLVED] How to convert QVideoFrame with Format_NV21 to QImage?
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cause the default constructor of QImage didn't support for Format_NV21
@
QImage::Format QVideoFrame::imageFormatFromPixelFormat(PixelFormat format)
{
switch (format) {
case Format_Invalid:
return QImage::Format_Invalid;
case Format_ARGB32:
return QImage::Format_ARGB32;
case Format_ARGB32_Premultiplied:
return QImage::Format_ARGB32_Premultiplied;
case Format_RGB32:
return QImage::Format_RGB32;
case Format_RGB24:
return QImage::Format_RGB888;
case Format_RGB565:
return QImage::Format_RGB16;
case Format_RGB555:
return QImage::Format_RGB555;
case Format_ARGB8565_Premultiplied:
return QImage::Format_ARGB8565_Premultiplied;
case Format_BGRA32:
case Format_BGRA32_Premultiplied:
case Format_BGR32:
case Format_BGR24:
return QImage::Format_Invalid;
case Format_BGR565:
case Format_BGR555:
case Format_BGRA5658_Premultiplied:
case Format_AYUV444:
case Format_AYUV444_Premultiplied:
case Format_YUV444:
case Format_YUV420P:
case Format_YV12:
case Format_UYVY:
case Format_YUYV:
case Format_NV12:
case Format_NV21:
case Format_IMC1:
case Format_IMC2:
case Format_IMC3:
case Format_IMC4:
case Format_Y8:
case Format_Y16:
case Format_Jpeg:
case Format_CameraRaw:
case Format_AdobeDng:
return QImage::Format_Invalid;
case Format_User:
return QImage::Format_Invalid;
}
return QImage::Format_Invalid;
}
@ -
I was just now looking for the same thing, quite a coincidence.
Quick googling revealed there's NV21 -> ARGB32 conversion algorithm available in Qt sources, in "qandroidmultimediautils"; see "https://qt.gitorious.org/qt/qtmultimedia/source/src/plugins/android/src/common/qandroidmultimediautils.cpp":https://qt.gitorious.org/qt/qtmultimedia/source/src/plugins/android/src/common/qandroidmultimediautils.cpp. I tried it and it works nicely, though a couple of points worth mentioning:
- Nexus 5 took 30-50 ms to decode one frame (1280x960), so you may not be able to decode a video feed in real-time
- It's LGPL if you copy the code directly to your own project. I think the header file isn't part of the public API.