public VideoGridMaker(FFmpegContext context)
{
_context = context;
_ioThread = new Thread(IoThread)
{
IsBackground = true
};
_ioThread.Start();
_makeThread = new Thread(MakeThread)
{
IsBackground = true
};
_makeThread.Start();
}
public bool Decode(ref H264PictureInfo pictureInfo, ISurface output, ReadOnlySpan <byte> bitstream)
{
Surface outSurf = (Surface)output;
if (outSurf.RequestedWidth != _oldOutputWidth ||
outSurf.RequestedHeight != _oldOutputHeight)
{
_context.Dispose();
_context = new FFmpegContext(AVCodecID.AV_CODEC_ID_H264);
_oldOutputWidth = outSurf.RequestedWidth;
_oldOutputHeight = outSurf.RequestedHeight;
}
Span <byte> bs = Prepend(bitstream, SpsAndPpsReconstruction.Reconstruct(ref pictureInfo, _workBuffer));
return(_context.DecodeFrame(outSurf, bs) == 0);
}
/// <summary>
/// Эта функция загружает
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
internal bool Load(FFmpegContext context)
{
var info = context.GetVideoInformationExtractor();
var durationResult = info.GetContainerDuration(_fileName);
if (durationResult.Result != null)
{
return(false);
}
int count = _parameters.XCount * _parameters.YCount + 1;
var duration = durationResult.Result.Value;
var timePart = TimeSpan.FromSeconds((duration.TotalSeconds / count));
TimeSpan time = TimeSpan.Zero;
var frameExtractor = context.GetVideoFramesExtractor();
for (int y = 0; y < _parameters.YCount; y++)
{
for (int x = 0; x < _parameters.XCount; x++)
{
time += timePart;
var frameResult = frameExtractor.GetFrameDataForVideoFile(_fileName, time);
BitmapImage img = new BitmapImage();
img.BeginInit();
img.StreamSource = new MemoryStream(frameResult.Result);
img.EndInit();
img.Freeze();
_times[x, y] = time;
_grid[x, y] = img;
}
}
return(true);
}