private static void RunApp(StreamerSettings streamerSettings)
{
Host.CreateDefaultBuilder()
.UseSystemd()
.ConfigureLogging((ctx, x) =>
{
x.SetMinimumLevel(LogLevel.Trace)
.AddFile(Path.Combine(streamerSettings.OutputFolder, "app.log"))
.AddConsole(t => t.Format = ConsoleLoggerFormat.Systemd);
})
.ConfigureServices((hostContext, services) =>
{
services.AddSingleton(streamerSettings);
services.AddSingleton <DuetWifiStatusProvider>();
services.AddHostedService <Worker>();
})
.Build()
.Run();
}
public Worker(ILoggerFactory loggerFactory, DuetWifiStatusProvider statusProvider, StreamerSettings streamerSettings)
{
FFMpegSetup.Init(loggerFactory.CreateLogger <FFMpegSetup>());
_logger = loggerFactory.CreateLogger <Worker>();
_logger.LogInformation($"Starting with settings: {streamerSettings}");
_statusProvider = statusProvider;
if (streamerSettings.WebCamUrl != null)
{
_webCamera = new MJpegStreamWebCameraProvider(loggerFactory.CreateLogger <MJpegStreamWebCameraProvider>(), streamerSettings);
}
else if (streamerSettings.WebCamDevice != null)
{
_webCamera = new Video4LinuxWebCameraProvider(loggerFactory.CreateLogger <Video4LinuxWebCameraProvider>(), streamerSettings);
}
else
{
throw new ArgumentOutOfRangeException("Either webcamUrl or webcamDevice should be enabled");
}
_streamerSettings = streamerSettings;
}
public VideoWriter(ILogger logger, string filename, int width, int height, AVPixelFormat webcamPixelFormat, StreamerSettings settings)
{
_logger = logger;
_fps = settings.FPS;
_videoFlipperConverter = new VideoFlipperConverter(width, height, webcamPixelFormat, settings);
_h264Codec = ffmpeg.avcodec_find_encoder_by_name("h264_omx");
if (_h264Codec == null)
{
_logger.LogError("Don't using hardware-accelerated h264 encoder, falling back to software one.");
_h264Codec = ffmpeg.avcodec_find_encoder_by_name("libx264");
}
if (_h264Codec == null)
{
throw new InvalidOperationException("Codec not found.");
}
fixed(AVFormatContext **occ = &_h264AvFormatContext)
{
AVOutputFormat *fmt = ffmpeg.av_guess_format("mp4", null, null);
ffmpeg.avformat_alloc_output_context2(occ, fmt, null, null);
_h264Stream = ffmpeg.avformat_new_stream(_h264AvFormatContext, _h264Codec);
_h264Stream->codec->width = width;
_h264Stream->codec->height = height;
_h264Stream->codec->time_base = new AVRational {
num = 1, den = _fps
};
_h264Stream->codec->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;
_h264Stream->codec->bit_rate = 1_500_000;
ffmpeg.av_opt_set(_h264Stream->codec->priv_data, "preset", "veryslow", 0);
if ((_h264AvFormatContext->oformat->flags & ffmpeg.AVFMT_GLOBALHEADER) != 0) // Some formats require a global header.
{
_h264Stream->codec->flags |= ffmpeg.AV_CODEC_FLAG_GLOBAL_HEADER;
}
ffmpeg.avcodec_open2(_h264Stream->codec, _h264Codec, null).ThrowExceptionIfError();
_h264Stream->time_base = new AVRational()
{
num = 1, den = _fps
};
ffmpeg.avio_open(&_h264AvFormatContext->pb, filename, ffmpeg.AVIO_FLAG_WRITE);
ffmpeg.avformat_write_header(_h264AvFormatContext, null).ThrowExceptionIfError();
}
}
public VideoFlipperConverter(int width, int height, AVPixelFormat inputPixelFormat, StreamerSettings settings)
{
string filters = $"buffer=width={width}:height={height}:pix_fmt={(int)inputPixelFormat}:time_base=1/1:pixel_aspect=1/1 [in]; [out] buffersink;[in] format=pix_fmts=0 [in1];";
int inputCount = 1;
if (settings.FlipY)
{
filters += $"[in{inputCount}] vflip [in{++inputCount}];";
}
if (settings.FlipX)
{
filters += $"[in{inputCount}] hflip [in{++inputCount}];";
}
filters += $"[in{inputCount}] copy [out]";
AVFilterInOut *gis = null;
AVFilterInOut *gos = null;
_filterGraph = ffmpeg.avfilter_graph_alloc();
ffmpeg.avfilter_graph_parse2(_filterGraph, filters, &gis, &gos).ThrowExceptionIfError();
ffmpeg.avfilter_graph_config(_filterGraph, null).ThrowExceptionIfError();
_filterSourceContext = ffmpeg.avfilter_graph_get_filter(_filterGraph, "Parsed_buffer_0");
_filterSinkContext = ffmpeg.avfilter_graph_get_filter(_filterGraph, "Parsed_buffersink_1");
if (_filterSourceContext == null || _filterSinkContext == null)
{
throw new Exception("Failed to create filter sinks");
}
_flippedFrame = ffmpeg.av_frame_alloc();
var flippedFrameBuffer = (byte *)ffmpeg.av_malloc((ulong)ffmpeg.av_image_get_buffer_size(AVPixelFormat.AV_PIX_FMT_YUV420P, width, height, 1));
var dataArr = new byte_ptrArray4();
dataArr.UpdateFrom(_flippedFrame->data);
var linesizeArr = new int_array4();
linesizeArr.UpdateFrom(_flippedFrame->linesize);
ffmpeg.av_image_fill_arrays(ref dataArr, ref linesizeArr, flippedFrameBuffer, AVPixelFormat.AV_PIX_FMT_YUV420P, width, height, 1);
_flippedFrame->data.UpdateFrom(dataArr);
_flippedFrame->linesize.UpdateFrom(linesizeArr);
}
public unsafe Video4LinuxWebCameraProvider(ILogger <Video4LinuxWebCameraProvider> logger, StreamerSettings settings)
{
_logger = logger;
_settings = settings;
Width = 1280;
Height = 720;
AVDictionary *options = null;
var ifmt = ffmpeg.av_find_input_format("v4l2");
if (ifmt == null)
{
// throw new Exception("Cannot find input format");
}
_fmtCtx = ffmpeg.avformat_alloc_context();
if (_fmtCtx == null)
{
throw new Exception("Cannot allocate input format (Out of memory?)");
}
// Enable non-blocking mode
_fmtCtx->flags |= ffmpeg.AVFMT_FLAG_NONBLOCK;
// framerate needs to set before opening the v4l2 device
ffmpeg.av_dict_set(&options, "framerate", "15", 0);
// This will not work if the camera does not support h264. In that case
// remove this line. I wrote this for Raspberry Pi where the camera driver
// can stream h264.
// ffmpeg.av_dict_set(&options, "input_format", "h264", 0);
ffmpeg.av_dict_set(&options, "video_size", Width + "x" + Height, 0);
// open input file, and allocate format context
fixed(AVFormatContext **fmtCtxAddr = &_fmtCtx)
ffmpeg.avformat_open_input(fmtCtxAddr, settings.WebCamDevice, ifmt, &options).ThrowExceptionIfError();
// retrieve stream information
ffmpeg.avformat_find_stream_info(_fmtCtx, null).ThrowExceptionIfError();
AVDictionary *opts = null;
var ret1 = ffmpeg.av_find_best_stream(_fmtCtx, AVMediaType.AVMEDIA_TYPE_VIDEO, -1, -1, null, 0);
ret1.ThrowExceptionIfError();
_videoStreamIdx = ret1;
var st = _fmtCtx->streams[_videoStreamIdx];
// find decoder for the stream
var decCtx = st->codec;
var dec = ffmpeg.avcodec_find_decoder(decCtx->codec_id);
if (dec == null)
{
throw new Exception("Failed to find video codec");
}
// Init the decoders, with or without reference counting
ffmpeg.av_dict_set(&opts, "refcounted_frames", "1", 0);
ffmpeg.avcodec_open2(decCtx, dec, &opts).ThrowExceptionIfError();
var video_stream = _fmtCtx->streams[_videoStreamIdx];
_videoDecCtx = video_stream->codec;
// dump input information to stderr
ffmpeg.av_dump_format(_fmtCtx, 0, settings.WebCamDevice, 0);
if (video_stream == null)
{
throw new Exception("Could not find video stream in the input, aborting");
}
_frame = ffmpeg.av_frame_alloc();
_pkt = ffmpeg.av_packet_alloc();
_pkt->data = null;
_pkt->size = 0;
}
public MJpegStreamWebCameraProvider(ILogger <MJpegStreamWebCameraProvider> logger, StreamerSettings settings)
{
_logger = logger;
_settings = settings;
_httpClient = new HttpClient();
}
public DuetWifiStatusProvider(StreamerSettings settings, ILogger <DuetWifiStatusProvider> logger)
{
_settings = settings;
_logger = logger;
_httpClient = new HttpClient();
}