/// <summary>
/// Creates a new Flash screen video.
/// </summary>
/// <param name="parameters">The video parameters.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="parameters"/> is null.</exception>
public FlashScreenVideo(FlashScreenVideoParameters parameters)
: base(parameters)
{
width = parameters.Width;
height = parameters.Height;
framesPerSecond = parameters.FramesPerSecond;
nominalBlockWidth = parameters.BlockWidth;
nominalBlockHeight = parameters.BlockHeight;
keyFramePeriodInFrames = Math.Max(1, (int) Math.Ceiling(parameters.KeyFramePeriod.TotalSeconds * framesPerSecond));
cols = (width + nominalBlockWidth - 1) / nominalBlockWidth;
rows = (height + nominalBlockHeight - 1) / nominalBlockHeight;
int framePixelsLength = width * height;
deflater = new Deflater(parameters.CompressionLevel, false);
reserveBytesPerFrame = (nominalBlockHeight * nominalBlockWidth * 3 + 2 /*block header size*/ + ZLibWorstCaseInflation) * rows * cols + 4 /*frame header size*/;
previousFramePixels = new int[framePixelsLength];
currentFramePixels = new int[framePixelsLength];
blockBuffer = new byte[nominalBlockHeight * nominalBlockWidth * 3];
flvWriter = new FlvWriter(FlvWriter.FlvFlags.Video);
var flvMetadata = new FlvWriter.FlvMetadata()
{
{ "duration", 0.0 },
{ "width", width },
{ "height", height },
{ "framerate", framesPerSecond },
{ "videocodecid", 3 /*screen video*/ },
{ "canSeekToEnd", true }
};
flvMetadataUpdater = flvWriter.WriteFlvMetaFrame(flvMetadata, 0);
}
/// <summary>
/// Creates a new Flash screen video.
/// </summary>
/// <param name="parameters">The video parameters.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="parameters"/> is null.</exception>
public FlashScreenVideo(FlashScreenVideoParameters parameters)
: base(parameters)
{
width = parameters.Width;
height = parameters.Height;
framesPerSecond = parameters.FramesPerSecond;
nominalBlockWidth = parameters.BlockWidth;
nominalBlockHeight = parameters.BlockHeight;
keyFramePeriodInFrames = Math.Max(1, (int)Math.Ceiling(parameters.KeyFramePeriod.TotalSeconds * framesPerSecond));
cols = (width + nominalBlockWidth - 1) / nominalBlockWidth;
rows = (height + nominalBlockHeight - 1) / nominalBlockHeight;
int framePixelsLength = width * height;
deflater = new Deflater(parameters.CompressionLevel, false);
reserveBytesPerFrame = (nominalBlockHeight * nominalBlockWidth * 3 + 2 /*block header size*/ + ZLibWorstCaseInflation) * rows * cols + 4 /*frame header size*/;
previousFramePixels = new int[framePixelsLength];
currentFramePixels = new int[framePixelsLength];
blockBuffer = new byte[nominalBlockHeight * nominalBlockWidth * 3];
flvWriter = new FlvWriter(FlvWriter.FlvFlags.Video);
var flvMetadata = new FlvWriter.FlvMetadata()
{
{ "duration", 0.0 },
{ "width", width },
{ "height", height },
{ "framerate", framesPerSecond },
{ "videocodecid", 3 /*screen video*/ },
{ "canSeekToEnd", true }
};
flvMetadataUpdater = flvWriter.WriteFlvMetaFrame(flvMetadata, 0);
}
public void CreateVideo()
{
const int width = 640;
const int height = 480;
const int frames = 30;
Stopwatch stopwatch = Stopwatch.StartNew();
var parameters = new FlashScreenVideoParameters(width, height, 5)
{
BlockWidth = 256,
BlockHeight = 256
};
video = new FlashScreenVideo(parameters);
stopwatch.Stop();
Bitmap bitmap = new Bitmap(width, height);
BitmapVideoFrame bitmapVideoFrame = new BitmapVideoFrame(bitmap);
for (int frame = 0; frame < frames; frame++)
{
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
try
{
int offset = 0;
for (int y = 0; y < height; y++)
{
int scanOffset = offset;
for (int x = 0; x < width; x++)
{
int color = (x * 255 / width) << 16 | (y * 255 / height) << 8 | frame * 255 / frames;
Marshal.WriteInt32(bitmapData.Scan0, scanOffset, color);
scanOffset += 4;
}
offset += bitmapData.Stride;
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
stopwatch.Start();
video.AddFrame(bitmapVideoFrame);
stopwatch.Stop();
}
TestLog.WriteLine("Video encoding {2} frames at {0}x{1} took {3}s", width, height, frames, stopwatch.Elapsed.TotalSeconds);
}
public void FramesPerSecond_ReturnsFramesPerSecond()
{
var parameters = new FlashScreenVideoParameters(32, 16, 30);
Assert.AreEqual(30, parameters.FramesPerSecond);
}
public void Height_ReturnsHeight()
{
var parameters = new FlashScreenVideoParameters(32, 16, 30);
Assert.AreEqual(16, parameters.Height);
}
public void Width_ReturnsWidth()
{
var parameters = new FlashScreenVideoParameters(32, 16, 30);
Assert.AreEqual(32, parameters.Width);
}
public void KeyFramePeriod_CanGetAndSetValue()
{
var parameters = new FlashScreenVideoParameters(32, 16, 30);
Assert.AreEqual(TimeSpan.FromSeconds(2), parameters.KeyFramePeriod);
parameters.KeyFramePeriod = TimeSpan.FromSeconds(0);
Assert.AreEqual(TimeSpan.FromSeconds(0), parameters.KeyFramePeriod);
var ex = Assert.Throws<ArgumentOutOfRangeException>(() => parameters.KeyFramePeriod = TimeSpan.FromSeconds(-1));
Assert.Contains(ex.Message, "Key frame period must not be negative.");
}
public void CompressionLevel_CanGetAndSetValue()
{
var parameters = new FlashScreenVideoParameters(32, 16, 30);
Assert.AreEqual(6, parameters.CompressionLevel);
parameters.CompressionLevel = 9;
Assert.AreEqual(9, parameters.CompressionLevel);
parameters.CompressionLevel = 0;
Assert.AreEqual(0, parameters.CompressionLevel);
var ex = Assert.Throws<ArgumentOutOfRangeException>(() => parameters.CompressionLevel = -1);
Assert.Contains(ex.Message, "Compression level must be between 0 and 9.");
ex = Assert.Throws<ArgumentOutOfRangeException>(() => parameters.CompressionLevel = 10);
Assert.Contains(ex.Message, "Compression level must be between 0 and 9.");
}
public void BlockHeight_CanGetAndSetValue()
{
var parameters = new FlashScreenVideoParameters(32, 16, 30);
Assert.AreEqual(64, parameters.BlockHeight);
parameters.BlockHeight = 256;
Assert.AreEqual(256, parameters.BlockHeight);
parameters.BlockHeight = 16;
Assert.AreEqual(16, parameters.BlockHeight);
var ex = Assert.Throws<ArgumentOutOfRangeException>(() => parameters.BlockHeight = 0);
Assert.Contains(ex.Message, "Block height must be a multiple of 16 between 16 and 256.");
ex = Assert.Throws<ArgumentOutOfRangeException>(() => parameters.BlockHeight = 256 + 16);
Assert.Contains(ex.Message, "Block height must be a multiple of 16 between 16 and 256.");
ex = Assert.Throws<ArgumentOutOfRangeException>(() => parameters.BlockHeight = 17);
Assert.Contains(ex.Message, "Block height must be a multiple of 16 between 16 and 256.");
}
