/// <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);
}
internal FlvMetadataUpdater WriteTo(FlvWriter writer)
{
var offsets = new Dictionary <string, int>();
writer.WriteAmfData("onMetaData");
writer.WriteAmfArrayBeginMarker(contents.Count);
foreach (var pair in contents)
{
writer.WriteAmfStringContent(pair.Key);
offsets.Add(pair.Key, writer.bufferOffset);
writer.WriteAmfData(pair.Value);
}
writer.WriteAmfArrayEndMarker();
return(new FlvMetadataUpdater(writer, offsets));
}
internal FlvMetadataUpdater(FlvWriter writer, Dictionary <string, int> offsets)
{
this.writer = writer;
this.offsets = offsets;
}
