public Decoder(string format, string camera, DataTransfer <MatAndBuffer> dataTransfer, bool enableHardware = false)
{
_dataTransfer = dataTransfer;
var inputFormat = ffmpeg.av_find_input_format(format);
if (inputFormat == null)
{
throw new ApplicationException($"Failed to find input format '{format}'");
}
var inputContext = ffmpeg.avformat_alloc_context();
try
{
AVDictionary *options = null;
ffmpeg.av_dict_set(&options, "video_size", "640x480", ffmpeg.AV_DICT_APPEND);
ffmpeg.avformat_open_input(&inputContext, camera, inputFormat, &options).ThrowExceptionIfError();
ffmpeg.av_dict_free(&options);
options = null;
try
{
ffmpeg.avformat_find_stream_info(inputContext, null).ThrowExceptionIfError();
AVCodec *decoder;
var videoStream = ffmpeg.av_find_best_stream(inputContext, AVMediaType.AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
if (videoStream < 0)
{
throw new ApplicationException("No video stream found");
}
AVBufferRef *hwDeviceContext = null;
var(hwPixelFormat, pixelFormat) = enableHardware ? SortoutHardware(decoder, out hwDeviceContext) : (AVPixelFormat.AV_PIX_FMT_NONE, AVPixelFormat.AV_PIX_FMT_NONE);
var decoderContext = ffmpeg.avcodec_alloc_context3(decoder);
var video = inputContext->streams[videoStream];
video->discard = AVDiscard.AVDISCARD_NONKEY;
ffmpeg.avcodec_parameters_to_context(decoderContext, video->codecpar).ThrowExceptionIfError();
if (hwPixelFormat != AVPixelFormat.AV_PIX_FMT_NONE)
{
AVCodecContext_get_format getFormat = (_, formats) =>
{
//AVPixelFormat* pixelFormat;
for (var pixelFormat = formats; *pixelFormat != AVPixelFormat.AV_PIX_FMT_NONE; pixelFormat++)
{
if (*pixelFormat == hwPixelFormat)
{
return(*pixelFormat);
}
}
throw new ApplicationException("Failed to get hardware pixel format");
};
decoderContext->get_format = getFormat;
}
ffmpeg.av_opt_set_int(decoderContext, "refcounted_frames", 1, 0);
if (hwPixelFormat != AVPixelFormat.AV_PIX_FMT_NONE)
{
decoderContext->hw_device_ctx = ffmpeg.av_buffer_ref(hwDeviceContext);
}
else
{
pixelFormat = ConvertFormat(video->codec->pix_fmt);
}
ffmpeg.avcodec_open2(decoderContext, decoder, null).ThrowExceptionIfError();
// Now all opened
_inputContext = inputContext;
_decoderContext = decoderContext;
CodecName = ffmpeg.avcodec_get_name(decoder->id);
FrameSize = new System.Drawing.Size(video->codec->width, video->codec->height);
PixelFormat = pixelFormat;
StreamIndex = videoStream;
_hwPixelFormat = hwPixelFormat;
_converter = new Converter(FrameSize, pixelFormat);
Console.WriteLine($"Opened stream {StreamIndex} of {CodecName} as {FrameSize.Width} x {FrameSize.Height} @ {PixelFormat}");
}
catch (Exception)
{
ffmpeg.avformat_close_input(&inputContext);
throw;
}
}
catch (Exception)
{
ffmpeg.avformat_free_context(inputContext);
throw;
}
}
internal DataOwner(T value, DataTransfer <T> parent)
{
Value = value;
_parent = parent;
}
