/// <summary>
/// Converts YUV_420_888 raw data to RGB bitmap.
/// </summary>
/// <returns>The RGB bitmap.</returns>
/// <param name="y">Y</param>
/// <param name="u">U</param>
/// <param name="v">V</param>
/// <param name="width">Width</param>
/// <param name="height">Height</param>
/// <param name="yRowStride">Y row stride (we know from documentation that PixelStride is 1 for y).</param>
/// <param name="uvRowStride">UV row stride (we know from documentation that RowStride is the same for u and v).</param>
/// <param name="uvPixelStride">Uv pixel stride (we know from documentation that PixelStride is the same for u and v).</param>
public Bitmap Yuv420888ToRgb(byte[] y, byte[] u, byte[] v, int width, int height, int yRowStride, int uvRowStride, int uvPixelStride)
{
// rs creation just for demo. Create rs just once in onCreate and use it again.
//RenderScript rs = (activity as MainActivity).RenderScript; // RenderScript.create(this);
RenderScript rs = RenderScript.Create(Android.App.Application.Context);
//RenderScript rs = MainActivity.rs;
ScriptC_yuv420888 mYuv420 = new ScriptC_yuv420888(rs);
// Y,U,V are defined as global allocations, the out-Allocation is the Bitmap.
// Note also that uAlloc and vAlloc are 1-dimensional while yAlloc is 2-dimensional.
RType.Builder typeUcharY = new RType.Builder(rs, Element.U8(rs));
typeUcharY.SetX(yRowStride).SetY(height);
Allocation yAlloc = Allocation.CreateTyped(rs, typeUcharY.Create());
yAlloc.CopyFrom(y);
mYuv420.Set_ypsIn(yAlloc);
RType.Builder typeUcharUV = new RType.Builder(rs, Element.U8(rs));
// note that the size of the u's and v's are as follows:
// ( (width/2)*PixelStride + padding ) * (height/2)
// = (RowStride ) * (height/2)
// but I noted that on the S7 it is 1 less...
typeUcharUV.SetX(u.Length);
Allocation uAlloc = Allocation.CreateTyped(rs, typeUcharUV.Create());
uAlloc.CopyFrom(u);
mYuv420.Set_uIn(uAlloc);
Allocation vAlloc = Allocation.CreateTyped(rs, typeUcharUV.Create());
vAlloc.CopyFrom(v);
mYuv420.Set_vIn(vAlloc);
// handover parameters
mYuv420.Set_picWidth(width);
mYuv420.Set_uvRowStride(uvRowStride);
mYuv420.Set_uvPixelStride(uvPixelStride);
Bitmap outBitmap = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
Allocation outAlloc = Allocation.CreateFromBitmap(rs, outBitmap, Allocation.MipmapControl.MipmapNone, Allocation.UsageScript);
Script.LaunchOptions lo = new Script.LaunchOptions();
lo.SetX(0, width); // by this we ignore the y’s padding zone, i.e. the right side of x between width and yRowStride
lo.SetY(0, height);
mYuv420.ForEach_doConvert(outAlloc, lo);
outAlloc.CopyTo(outBitmap);
return(outBitmap);
}
//public void OnImageAvailable(ImageReader reader)
//{
// var handler = PreviewFrameAvailable;
// if (handler == null) { return; }
// //handler(this, null);
// using (var image = reader.AcquireNextImage())
// {
// try
// {
// //var plane = reader.AcquireNextImage().GetPlanes()[0];
// if (image == null) { return; }
// //var planes = image.GetPlanes();
// //var plane = planes[0];
// //var buffer = plane.Buffer;
// //buffer.Rewind();
// //byte[] bytes = new byte[buffer.Remaining()];
// //buffer.Get(bytes);
// ////using (var output = new FileOutputStream(new Java.IO.File(activity.GetExternalFilesDir(null), "florin-pic.jpg")))
// ////{
// //// try
// //// {
// //// output.Write(bytes);
// //// }
// //// catch (Java.IO.IOException e)
// //// {
// //// System.Diagnostics.Debug.WriteLine($"{e}");
// //// }
// ////}
// //using (Bitmap bitmap = BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length))
// //{
// // var rawBuffer = ByteBuffer.Allocate(bitmap.ByteCount);
// // bitmap.CopyPixelsToBuffer(rawBuffer);
// // rawBuffer.Rewind();
// // byte[] rawBytes = new byte[rawBuffer.Remaining()];
// // rawBuffer.Get(rawBytes);
// // handler(this, new CameraPreviewEventArgs { FrameData = rawBytes, Width = bitmap.Width, Height = bitmap.Height });
// //}
// using (Bitmap bitmap = YUV_420_888_toRGB(image, image.Width, image.Height))
// {
// var rawBuffer = ByteBuffer.Allocate(bitmap.ByteCount);
// bitmap.CopyPixelsToBuffer(rawBuffer);
// rawBuffer.Rewind();
// byte[] rawBytes = new byte[rawBuffer.Remaining()];
// rawBuffer.Get(rawBytes);
// handler(this, new CameraPreviewEventArgs { FrameData = rawBytes, Width = bitmap.Width, Height = bitmap.Height });
// }
// }
// finally
// {
// image?.Close();
// }
// }
//}
private Bitmap YUV_420_888_toRGB(Image image, int width, int height)
{
// Get the three image planes
Image.Plane[] planes = image.GetPlanes();
ByteBuffer buffer = planes[0].Buffer;
byte[] y = new byte[buffer.Remaining()];
buffer.Get(y);
buffer = planes[1].Buffer;
byte[] u = new byte[buffer.Remaining()];
buffer.Get(u);
buffer = planes[2].Buffer;
byte[] v = new byte[buffer.Remaining()];
buffer.Get(v);
// get the relevant RowStrides and PixelStrides
// (we know from documentation that PixelStride is 1 for y)
int yRowStride = planes[0].RowStride;
int uvRowStride = planes[1].RowStride; // we know from documentation that RowStride is the same for u and v.
int uvPixelStride = planes[1].PixelStride; // we know from documentation that PixelStride is the same for u and v.
// rs creation just for demo. Create rs just once in onCreate and use it again.
RenderScript rs = (activity as MainActivity).RenderScript; // RenderScript.create(this);
//RenderScript rs = RenderScript.Create(Android.App.Application.Context);
//RenderScript rs = MainActivity.rs;
ScriptC_yuv420888 mYuv420 = new ScriptC_yuv420888(rs);
// Y,U,V are defined as global allocations, the out-Allocation is the Bitmap.
// Note also that uAlloc and vAlloc are 1-dimensional while yAlloc is 2-dimensional.
RType.Builder typeUcharY = new RType.Builder(rs, Element.U8(rs));
typeUcharY.SetX(yRowStride).SetY(height);
Allocation yAlloc = Allocation.CreateTyped(rs, typeUcharY.Create());
yAlloc.CopyFrom(y);
mYuv420.Set_ypsIn(yAlloc);
RType.Builder typeUcharUV = new RType.Builder(rs, Element.U8(rs));
// note that the size of the u's and v's are as follows:
// ( (width/2)*PixelStride + padding ) * (height/2)
// = (RowStride ) * (height/2)
// but I noted that on the S7 it is 1 less...
typeUcharUV.SetX(u.Length);
Allocation uAlloc = Allocation.CreateTyped(rs, typeUcharUV.Create());
uAlloc.CopyFrom(u);
mYuv420.Set_uIn(uAlloc);
Allocation vAlloc = Allocation.CreateTyped(rs, typeUcharUV.Create());
vAlloc.CopyFrom(v);
mYuv420.Set_vIn(vAlloc);
// handover parameters
mYuv420.Set_picWidth(width);
mYuv420.Set_uvRowStride(uvRowStride);
mYuv420.Set_uvPixelStride(uvPixelStride);
Bitmap outBitmap = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
Allocation outAlloc = Allocation.CreateFromBitmap(rs, outBitmap, Allocation.MipmapControl.MipmapNone, Allocation.UsageScript);
Script.LaunchOptions lo = new Script.LaunchOptions();
lo.SetX(0, width); // by this we ignore the y’s padding zone, i.e. the right side of x between width and yRowStride
lo.SetY(0, height);
mYuv420.ForEach_doConvert(outAlloc, lo);
outAlloc.CopyTo(outBitmap);
return(outBitmap);
}
