/// <summary>
/// Creates a new instance of <see cref="FFmpegWriter"/>.
/// </summary>
public FFmpegWriter(FFmpegVideoWriterArgs Args)
{
if (!FFmpegService.FFmpegExists)
{
throw new FFmpegNotFoundException();
}
var nv12 = Args.ImageProvider.DummyFrame is INV12Frame;
var settings = ServiceProvider.Get <FFmpegSettings>();
var w = Args.ImageProvider.Width;
var h = Args.ImageProvider.Height;
_videoBuffer = new byte[(int)(w * h * (nv12 ? 1.5 : 4))];
Console.WriteLine($"Video Buffer Allocated: {_videoBuffer.Length}");
var videoPipeName = GetPipeName();
var argsBuilder = new FFmpegArgsBuilder();
argsBuilder.AddInputPipe(videoPipeName)
.AddArg("thread_queue_size", 512)
.AddArg("framerate", Args.FrameRate)
.SetFormat("rawvideo")
.AddArg("pix_fmt", nv12 ? "nv12" : "rgb32")
.SetVideoSize(w, h);
var output = argsBuilder.AddOutputFile(Args.FileName)
.SetFrameRate(Args.FrameRate);
Args.VideoCodec.Apply(settings, Args, output);
if (settings.Resize)
{
var width = settings.ResizeWidth;
var height = settings.ResizeHeight;
if (width % 2 == 1)
{
++width;
}
if (height % 2 == 1)
{
++height;
}
output.AddArg("vf", $"scale={width}:{height}");
}
if (Args.AudioProvider != null)
{
var audioPipeName = GetPipeName();
argsBuilder.AddInputPipe(audioPipeName)
.AddArg("thread_queue_size", 512)
.SetFormat("s16le")
.SetAudioCodec("pcm_s16le")
.SetAudioFrequency(Args.Frequency)
.SetAudioChannels(Args.Channels);
Args.VideoCodec.AudioArgsProvider(Args.AudioQuality, output);
var wf = Args.AudioProvider.WaveFormat;
_audioBytesPerFrame = (int)((1.0 / Args.FrameRate)
* wf.SampleRate
* wf.Channels
* (wf.BitsPerSample / 8.0));
// UpdatePeriod * Frequency * (Bytes per Second) * Channels * 2
var audioBufferSize = (int)((1000.0 / Args.FrameRate) * 44.1 * 2 * 2 * 2);
_audioPipe = new NamedPipeServerStream(audioPipeName, PipeDirection.Out, 1, PipeTransmissionMode.Byte, PipeOptions.Asynchronous, 0, audioBufferSize);
}
_ffmpegIn = new NamedPipeServerStream(videoPipeName, PipeDirection.Out, 1, PipeTransmissionMode.Byte, PipeOptions.Asynchronous, 0, _videoBuffer.Length);
_ffmpegProcess = FFmpegService.StartFFmpeg(argsBuilder.GetArgs(), Args.FileName, out _);
}
