private static void RoundTripNoEncodingTestPattern()
{
var testBmp = new Bitmap(TEST_PATTERN_IMAGE_PATH);
int w = testBmp.Width;
int h = testBmp.Height;
var rgbToi420 = new VideoFrameConverter(
testBmp.Size.Width, testBmp.Size.Height,
AVPixelFormat.AV_PIX_FMT_RGB24,
testBmp.Size.Width, testBmp.Size.Height,
AVPixelFormat.AV_PIX_FMT_YUV420P);
var i420Converter = new VideoFrameConverter(
testBmp.Size.Width, testBmp.Size.Height,
AVPixelFormat.AV_PIX_FMT_YUV420P,
testBmp.Size.Width, testBmp.Size.Height,
AVPixelFormat.AV_PIX_FMT_RGB24);
BitmapData bmpData = testBmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
IntPtr bmpDataPtr = bmpData.Scan0;
int stride = bmpData.Stride;
byte[] bmpBuffer = new byte[Math.Abs(stride * h)];
Marshal.Copy(bmpDataPtr, bmpBuffer, 0, bmpBuffer.Length);
testBmp.UnlockBits(bmpData);
Console.WriteLine($"Test pattern stride {stride}.");
// Convert bitmap to i420.
var i420Buffer = rgbToi420.ConvertToBuffer(bmpBuffer);
Console.WriteLine($"Converted rgb to i420 buffer, length {i420Buffer.Length}.");
// Convert i420 back to bmp.
var outRgb = i420Converter.ConvertToBuffer(i420Buffer);
Console.WriteLine($"Converted i420 to rgb buffer, length {outRgb.Length}.");
unsafe
{
fixed(byte *s = outRgb)
{
System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(w, h, outRgb.Length / h, PixelFormat.Format24bppRgb, (IntPtr)s);
bmpImage.Save("testpattern-result.bmp");
bmpImage.Dispose();
}
}
}
private static void RoundTripNoEncodingDummyBitmap()
{
int width = 32;
int height = 32;
Size sz = new Size(width, height);
var rgbToi420 = new VideoFrameConverter(
width, height,
AVPixelFormat.AV_PIX_FMT_RGB24,
width, height,
AVPixelFormat.AV_PIX_FMT_YUV420P);
var i420Converter = new VideoFrameConverter(
width, height,
AVPixelFormat.AV_PIX_FMT_YUV420P,
width, height,
AVPixelFormat.AV_PIX_FMT_RGB24);
// Create dummy bitmap.
byte[] srcRgb = new byte[width * height * 3];
for (int row = 0; row < 32; row++)
{
for (int col = 0; col < 32; col++)
{
int index = row * width * 3 + col * 3;
int red = (row < 16 && col < 16) ? 255 : 0;
int green = (row < 16 && col > 16) ? 255 : 0;
int blue = (row > 16 && col < 16) ? 255 : 0;
srcRgb[index] = (byte)red;
srcRgb[index + 1] = (byte)green;
srcRgb[index + 2] = (byte)blue;
}
}
unsafe
{
fixed(byte *src = srcRgb)
{
System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(width, height, srcRgb.Length / height, PixelFormat.Format24bppRgb, (IntPtr)src);
bmpImage.Save("test-source.bmp");
bmpImage.Dispose();
}
}
// Convert bitmap to i420.
var i420Buffer = rgbToi420.ConvertToBuffer(srcRgb);
Console.WriteLine($"Converted rgb to i420 buffer, length {i420Buffer.Length}.");
// Convert i420 back to bmp.
var outRgb = i420Converter.ConvertToBuffer(i420Buffer);
Console.WriteLine($"Converted i420 to rgb buffer, length {outRgb.Length}.");
unsafe
{
fixed(byte *s = outRgb)
{
System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(width, height, outRgb.Length / height, PixelFormat.Format24bppRgb, (IntPtr)s);
bmpImage.Save("test-result.bmp");
bmpImage.Dispose();
}
}
}