private void Initialize(int width, int height, AVPixelFormat inFormat)
{
_initialized = true;
_pContext = FFmpegInvoke.sws_getContext(width, height, inFormat, width, height, _pixelFormat, FFmpegInvoke.SWS_FAST_BILINEAR, null, null, null);
if (_pContext == null)
throw new VideoConverterException("Could not initialize the conversion context.");
_pCurrentFrame = FFmpegInvoke.avcodec_alloc_frame();
int outputDataSize = FFmpegInvoke.avpicture_get_size(_pixelFormat, width, height);
_outputData = new byte[outputDataSize];
fixed (byte* pOutputData = &_outputData[0])
{
FFmpegInvoke.avpicture_fill((AVPicture*)_pCurrentFrame, pOutputData, _pixelFormat, width, height);
}
}
public VideoFrame(int width, int height, AVPixelFormat format, int align = 0) : base()
{
AllocBuffer(width, height, format, align);
}
public static extern int av_image_copy_to_buffer(byte* dst, int dst_size, byte** src_data, int* src_linesize, AVPixelFormat pix_fmt, int width, int height, int align);
public static extern int av_image_alloc(byte** pointers, int* linesizes, int w, int h, AVPixelFormat pix_fmt, int align);
public static extern AVPixelFormat av_find_best_pix_fmt_of_2(AVPixelFormat dst_pix_fmt1, AVPixelFormat dst_pix_fmt2, AVPixelFormat src_pix_fmt, int has_alpha, int* loss_ptr);
public static extern int av_pix_fmt_get_chroma_sub_sample(AVPixelFormat pix_fmt, int* h_shift, int* v_shift);
public static extern AVFilterBufferRef* avfilter_get_video_buffer_ref_from_arrays(byte** data, int* linesize, int perms, int w, int h, AVPixelFormat format);
public static extern AVPixelFormat avcodec_find_best_pix_fmt_of_list(AVPixelFormat* pix_fmt_list, AVPixelFormat src_pix_fmt, int has_alpha, int* loss_ptr);
public static extern void av_picture_copy(AVPicture *dst, AVPicture *src, AVPixelFormat pix_fmt, int width, int height);
public static extern int avpicture_layout(AVPicture *src, AVPixelFormat pix_fmt, int width, int height, byte *dest, int dest_size);
public static extern int avpicture_fill(AVPicture *picture, byte *ptr, AVPixelFormat pix_fmt, int width, int height);
public static extern int avpicture_alloc(AVPicture *picture, AVPixelFormat pix_fmt, int width, int height);
public unsafe VideoFrameConverter(Size sourceSize, AVPixelFormat sourcePixelFormat, Size destinationSize, AVPixelFormat destinationPixelFormat)
{
this._destinationSize = destinationSize;
this._pConvertContext = ffmpeg.sws_getContext(sourceSize.Width, sourceSize.Height, sourcePixelFormat, destinationSize.Width, destinationSize.Height, destinationPixelFormat, 1, null, null, null);
if (this._pConvertContext == null)
{
throw new ApplicationException("Could not initialize the conversion context.");
}
int convertedFrameBufferSize = ffmpeg.av_image_get_buffer_size(destinationPixelFormat, destinationSize.Width, destinationSize.Height, 1);
this._convertedFrameBufferPtr = Marshal.AllocHGlobal(convertedFrameBufferSize);
this._dstData = default(byte_ptrArray4);
this._dstLinesize = default(int_array4);
ffmpeg.av_image_fill_arrays(ref this._dstData, ref this._dstLinesize, (byte *)(void *)this._convertedFrameBufferPtr, destinationPixelFormat, destinationSize.Width, destinationSize.Height, 1);
}
public static extern int av_image_fill_arrays(ref byte_ptrArray4 dst_data, ref int_array4 dst_linesize, byte *src, AVPixelFormat pix_fmt, int width, int height, int align);
public void Init(int width, int height, AVPixelFormat format, int align = 0)
{
Clear();
AllocBuffer(width, height, format, align);
}
public static extern int av_picture_crop(AVPicture* dst, AVPicture* src, AVPixelFormat pix_fmt, int top_band, int left_band);
public static extern void avcodec_get_chroma_sub_sample(AVPixelFormat pix_fmt, int* h_shift, int* v_shift);
public static extern int av_picture_crop(AVPicture *dst, AVPicture *src, AVPixelFormat pix_fmt, int top_band, int left_band);
public static extern int av_opt_set_pixel_fmt(void* obj, String name, AVPixelFormat fmt, int search_flags);
public static extern int av_picture_pad(AVPicture *dst, AVPicture *src, int height, int width, AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color);
public static extern String av_get_pix_fmt_string(String buf, int buf_size, AVPixelFormat pix_fmt);
public static extern void avcodec_get_chroma_sub_sample(AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
public static extern AVPixelFormat av_pix_fmt_swap_endianness(AVPixelFormat pix_fmt);
public static extern uint avcodec_pix_fmt_to_codec_tag(AVPixelFormat pix_fmt);
public static extern int av_image_fill_linesizes(int* linesizes, AVPixelFormat pix_fmt, int width);
public static extern int avcodec_get_pix_fmt_loss(AVPixelFormat dst_pix_fmt, AVPixelFormat src_pix_fmt, int has_alpha);
public static extern int av_image_fill_arrays(byte** dst_data, int* dst_linesize, byte* src, AVPixelFormat pix_fmt, int width, int height, int align);
public static extern AVPixelFormat avcodec_find_best_pix_fmt_of_list(AVPixelFormat *pix_fmt_list, AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
public static extern int sws_isSupportedEndiannessConversion(AVPixelFormat pix_fmt);
public static extern AVPixelFormat avcodec_find_best_pix_fmt2(AVPixelFormat dst_pix_fmt1, AVPixelFormat dst_pix_fmt2, AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
public static extern void av_picture_copy(AVPicture* dst, AVPicture* src, AVPixelFormat pix_fmt, int width, int height);
public static unsafe byte[]? GetThumbnail(FfmpegSettings settings, bool extendedLogging)
{
try {
if (UseNativeBinding)
{
bool isGrayByte = settings.GrayScale == 1;
AVHWDeviceType HWDevice = HardwareAccelerationMode switch {
FFHardwareAccelerationMode.vdpau => AVHWDeviceType.AV_HWDEVICE_TYPE_VDPAU,
FFHardwareAccelerationMode.dxva2 => AVHWDeviceType.AV_HWDEVICE_TYPE_DXVA2,
FFHardwareAccelerationMode.vaapi => AVHWDeviceType.AV_HWDEVICE_TYPE_VAAPI,
FFHardwareAccelerationMode.qsv => AVHWDeviceType.AV_HWDEVICE_TYPE_QSV,
FFHardwareAccelerationMode.cuda => AVHWDeviceType.AV_HWDEVICE_TYPE_CUDA,
_ => AVHWDeviceType.AV_HWDEVICE_TYPE_NONE
};
using var vsd = new VideoStreamDecoder(settings.File, HWDevice);
if (vsd.PixelFormat < 0 || vsd.PixelFormat >= AVPixelFormat.AV_PIX_FMT_NB)
{
throw new Exception($"Invalid source pixel format");
}
Size sourceSize = vsd.FrameSize;
AVPixelFormat sourcePixelFormat = HWDevice == AVHWDeviceType.AV_HWDEVICE_TYPE_NONE
? vsd.PixelFormat
: FFmpegHelper.GetHWPixelFormat(HWDevice);
Size destinationSize = isGrayByte ? new Size(16, 16) : new Size(100, Convert.ToInt32(sourceSize.Height * (100 / (double)sourceSize.Width)));
AVPixelFormat destinationPixelFormat = isGrayByte ? AVPixelFormat.AV_PIX_FMT_GRAY8 : AVPixelFormat.AV_PIX_FMT_BGRA;
using var vfc =
new VideoFrameConverter(sourceSize, sourcePixelFormat, destinationSize, destinationPixelFormat);
if (!vsd.TryDecodeFrame(out var frame, settings.Position))
{
throw new Exception($"Failed decoding frame at {settings.Position}");
}
AVFrame convertedFrame = vfc.Convert(frame);
if (isGrayByte)
{
int length = ffmpeg.av_image_get_buffer_size(destinationPixelFormat, convertedFrame.width,
convertedFrame.height, 1).ThrowExceptionIfError();
byte[] data = new byte[length];
Marshal.Copy((IntPtr)convertedFrame.data[0], data, 0, length);
return(data);
}
else
{
int width = convertedFrame.width;
int height = convertedFrame.height;
var totalBytes = width * height * 4;
var rgbaBytes = new byte[totalBytes];
int stride = convertedFrame.linesize[0];
if (stride == width * 4)
{
Marshal.Copy((IntPtr)convertedFrame.data[0], rgbaBytes, 0, totalBytes);
}
else
{
var sourceOffset = 0;
var destOffset = 0;
var byteWidth = width * 4;
for (var y = 0; y < height; y++)
{
Marshal.Copy((IntPtr)convertedFrame.data[0] + sourceOffset, rgbaBytes, destOffset, byteWidth);
sourceOffset += stride;
destOffset += byteWidth;
}
}
var image = Image.LoadPixelData <SixLabors.ImageSharp.PixelFormats.Bgra32>(rgbaBytes, width, height);
using MemoryStream stream = new();
image.Save(stream, new SixLabors.ImageSharp.Formats.Jpeg.JpegEncoder());
bool equal = rgbaBytes.SequenceEqual(stream.ToArray());
return(stream.ToArray());
}
}
}
catch (Exception e) {
Logger.Instance.Info($"Failed using native FFmpeg binding on '{settings.File}', try switching to process mode. Exception: {e}");
}
//https://docs.microsoft.com/en-us/dotnet/csharp/how-to/concatenate-multiple-strings#string-literals
string ffmpegArguments = $" -hide_banner -loglevel {(extendedLogging ? "error" : "quiet")}" +
$" -y -hwaccel {HardwareAccelerationMode} -ss {settings.Position} -i \"{settings.File}\"" +
$" -t 1 -f {(settings.GrayScale == 1 ? "rawvideo -pix_fmt gray" : "mjpeg")} -vframes 1" +
$" {(settings.GrayScale == 1 ? "-s 16x16" : "-vf scale=100:-1")} {CustomFFArguments} \"-\"";
using var process = new Process {
StartInfo = new ProcessStartInfo {
Arguments = ffmpegArguments,
FileName = FFmpegPath,
CreateNoWindow = true,
RedirectStandardInput = false,
RedirectStandardOutput = true,
WorkingDirectory = Path.GetDirectoryName(FFmpegPath) !,
RedirectStandardError = extendedLogging,
WindowStyle = ProcessWindowStyle.Hidden
}
};
string errOut = string.Empty;
byte[]? bytes = null;
try {
process.EnableRaisingEvents = true;
process.Start();
if (extendedLogging)
{
process.ErrorDataReceived += new DataReceivedEventHandler((sender, e) => {
if (e.Data?.Length > 0)
{
errOut += Environment.NewLine + e.Data;
}
});
process.BeginErrorReadLine();
}
using var ms = new MemoryStream();
process.StandardOutput.BaseStream.CopyTo(ms);
if (!process.WaitForExit(TimeoutDuration))
{
throw new TimeoutException($"FFmpeg timed out on file: {settings.File}");
}
else if (extendedLogging)
{
process.WaitForExit(); // Because of asynchronous event handlers, see: https://github.com/dotnet/runtime/issues/18789
}
if (process.ExitCode != 0)
{
throw new FFInvalidExitCodeException($"FFmpeg exited with: {process.ExitCode}");
}
bytes = ms.ToArray();
if (bytes.Length == 0)
{
bytes = null; // Makes subsequent checks easier
}
else if (settings.GrayScale == 1 && bytes.Length != 256)
{
bytes = null;
errOut += $"{Environment.NewLine}graybytes length != 256";
}
}
catch (Exception e) {
errOut += $"{Environment.NewLine}{e.Message}";
try {
if (process.HasExited == false)
{
process.Kill();
}
}
catch { }
bytes = null;
}
if (bytes == null || errOut.Length > 0)
{
string message = $"{((bytes == null) ? "ERROR: Failed to retrieve" : "WARNING: Problems while retrieving")} {(settings.GrayScale == 1 ? "graybytes" : "thumbnail")} from: {settings.File}";
if (extendedLogging)
{
message += $":{Environment.NewLine}{FFmpegPath} {ffmpegArguments}";
}
Logger.Instance.Info($"{message}{errOut}");
}
return(bytes);
}
public static extern int av_picture_pad(AVPicture* dst, AVPicture* src, int height, int width, AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int* color);
public static MediaEncode CreateVideoEncode(OutFormat oformat, int width, int height, int fps, long bitRate = 0, AVPixelFormat format = AVPixelFormat.AV_PIX_FMT_NONE)
{
return(CreateVideoEncode(oformat.VideoCodec, oformat.Flags, width, height, fps, bitRate, format));
}
public static extern int avcodec_pix_fmt_to_codec_tag(AVPixelFormat pix_fmt);
/// <summary>
/// Create and init video encode
/// </summary>
/// <param name="videoCodec"></param>
/// <param name="flags"><see cref="MediaFormat.Flags"/></param>
/// <param name="width">width pixel, must be greater than 0</param>
/// <param name="height">height pixel, must be greater than 0</param>
/// <param name="fps">fps, must be greater than 0</param>
/// <param name="bitRate">default is auto bit rate, must be greater than or equal to 0</param>
/// <param name="format">default is first supported pixel format</param>
/// <returns></returns>
public static MediaEncode CreateVideoEncode(AVCodecID videoCodec, int flags, int width, int height, int fps, long bitRate = 0, AVPixelFormat format = AVPixelFormat.AV_PIX_FMT_NONE)
{
unsafe
{
return(CreateEncode(videoCodec, flags, _ =>
{
AVCodecContext *pCodecContext = _;
if (width <= 0 || height <= 0 || fps <= 0 || bitRate < 0)
{
throw new FFmpegException(FFmpegException.NonNegative);
}
if (_.SupportedPixelFmts.Count() <= 0)
{
throw new FFmpegException(FFmpegException.NotSupportCodecId);
}
if (format == AVPixelFormat.AV_PIX_FMT_NONE)
{
format = _.SupportedPixelFmts[0];
}
else if (_.SupportedPixelFmts.Where(__ => __ == format).Count() <= 0)
{
throw new FFmpegException(FFmpegException.NotSupportFormat);
}
pCodecContext->width = width;
pCodecContext->height = height;
pCodecContext->time_base = new AVRational {
num = 1, den = fps
};
pCodecContext->pix_fmt = format;
pCodecContext->bit_rate = bitRate;
}));
}
}
public static extern AVPixelFormat avcodec_default_get_format(AVCodecContext* s, AVPixelFormat* fmt);
public VideoFrameConverter(Size sourceSize, AVPixelFormat sourcePixelFormat, Size destinationSize, AVPixelFormat destinationPixelFormat)
{
_destinationSize = destinationSize;
_pConvertContext = ffmpeg.sws_getContext(sourceSize.Width, sourceSize.Height, sourcePixelFormat,
destinationSize.Width,
destinationSize.Height, destinationPixelFormat,
ffmpeg.SWS_FAST_BILINEAR, null, null, null);
if (_pConvertContext == null)
{
throw new ApplicationException("Could not initialize the conversion context.");
}
var convertedFrameBufferSize = ffmpeg.av_image_get_buffer_size(destinationPixelFormat, destinationSize.Width, destinationSize.Height, 1);
_convertedFrameBufferPtr = Marshal.AllocHGlobal(convertedFrameBufferSize);
_dstData = new byte_ptrArray4();
_dstLinesize = new int_array4();
ffmpeg.av_image_fill_arrays(ref _dstData, ref _dstLinesize, (byte *)_convertedFrameBufferPtr, destinationPixelFormat, destinationSize.Width, destinationSize.Height, 1);
}
public static extern int av_opt_get_pixel_fmt(void* obj, String name, int search_flags, AVPixelFormat* out_fmt);
public static extern int sws_isSupportedOutput(AVPixelFormat @pix_fmt);
public static extern String av_get_pix_fmt_name(AVPixelFormat pix_fmt);
public static extern int sws_isSupportedEndiannessConversion(AVPixelFormat @pix_fmt);
public static extern AVPixFmtDescriptor* av_pix_fmt_desc_get(AVPixelFormat pix_fmt);
public static extern SwsContext *sws_getContext(int @srcW, int @srcH, AVPixelFormat @srcFormat, int @dstW, int @dstH, AVPixelFormat @dstFormat, int @flags, SwsFilter * @srcFilter, SwsFilter * @dstFilter, double * @param);
public static extern int av_pix_fmt_count_planes(AVPixelFormat pix_fmt);
private static extern SwsContext *sws_getContext(int srcW, int srcH, AVPixelFormat srcFormat, int dstW, int dstH, AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
public static extern int av_get_pix_fmt_loss(AVPixelFormat dst_pix_fmt, AVPixelFormat src_pix_fmt, int has_alpha);
internal static extern SwsContext *sws_getCachedContext(SwsContext *context, int srcW, int srcH, AVPixelFormat srcFormat, int dstW, int dstH, AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
public static extern int av_image_get_linesize(AVPixelFormat pix_fmt, int width, int plane);
internal static extern int av_image_get_buffer_size(AVPixelFormat pixFmt, int width, int height, int align);
public static extern int av_image_fill_pointers(byte** data, AVPixelFormat pix_fmt, int height, byte* ptr, int* linesizes);
internal static extern int av_image_fill_arrays(ref BytePtrArray4 dstData, ref IntArray4 dstLinesize, byte *src, AVPixelFormat pixFmt, int width, int height, int align);
public static extern void av_image_copy(byte** dst_data, int* dst_linesizes, byte** src_data, int* src_linesizes, AVPixelFormat pix_fmt, int width, int height);
public void WriteFrame(Bitmap frame, int level, long msOffset)
{
if (!_opened)
{
throw new Exception("An audio file was not opened yet.");
}
if (ffmpeg.avcodec_is_open(_videoCodecContext) <= 0)
{
throw new Exception("codec is not open");
}
if ((frame.Width != _videoCodecContext->width) || (frame.Height != _videoCodecContext->height))
{
throw new Exception("Bitmap size must be of the same as video size, which was specified on opening video file.");
}
BitmapData bitmapData = frame.LockBits(new Rectangle(0, 0, _width, _height), ImageLockMode.ReadOnly,
(frame.PixelFormat == PixelFormat.Format8bppIndexed) ? PixelFormat.Format8bppIndexed : PixelFormat.Format24bppRgb);
var ptr = (sbyte *)bitmapData.Scan0;
int srcLinesize = bitmapData.Stride;
if (_swsContext == null)
{
AVPixelFormat pfmt = AVPixelFormat.AV_PIX_FMT_BGR24;
if (frame.PixelFormat == PixelFormat.Format8bppIndexed)
{
pfmt = AVPixelFormat.AV_PIX_FMT_GRAY8;
}
_swsContext = ffmpeg.sws_getCachedContext(_swsContext, _videoCodecContext->width, _videoCodecContext->height, pfmt, _videoCodecContext->width, _videoCodecContext->height, _videoCodecContext->pix_fmt, ffmpeg.SWS_FAST_BILINEAR, null, null, null);
}
int h = ffmpeg.sws_scale(_swsContext, &ptr, &srcLinesize, 0, _videoCodecContext->height, &_videoFrame->data0, _videoFrame->linesize);
frame.UnlockBits(bitmapData);
if (h <= 0)
{
throw new Exception("Error scaling image");
}
if (!_isConstantFramerate)
{
var pts = msOffset;
_videoFrame->pts = pts;
}
else
{
_videoFrame->pts = _frameNumber;
}
_frameNumber++;
int ret;
AVPacket packet = new AVPacket();
ffmpeg.av_init_packet(&packet);
if ((_formatContext->oformat->flags & ffmpeg.AVFMT_RAWPICTURE) == ffmpeg.AVFMT_RAWPICTURE)
{
packet.flags |= ffmpeg.AV_PKT_FLAG_KEY;
packet.stream_index = _videoStream->index;
packet.data = _videoFrame->data0;
packet.size = sizeof(AVPicture);
ret = ffmpeg.av_interleaved_write_frame(_formatContext, &packet);
}
else
{
int gotPacket;
packet.data = null;
packet.size = 0;
ret = ffmpeg.avcodec_encode_video2(_videoCodecContext, &packet, _videoFrame, &gotPacket);
if (ret < 0)
{
ffmpeg.av_free_packet(&packet);
throw new Exception("Error while writing video frame (" + ret + ")");
}
if (gotPacket > 0 && packet.size > 0)
{
if ((ulong)packet.pts != ffmpeg.AV_NOPTS_VALUE)
{
packet.pts = ffmpeg.av_rescale_q(packet.pts, _videoCodecContext->time_base, _videoStream->time_base);
}
if ((ulong)packet.dts != ffmpeg.AV_NOPTS_VALUE)
{
packet.dts = ffmpeg.av_rescale_q(packet.dts, _videoCodecContext->time_base, _videoStream->time_base);
}
packet.stream_index = _videoStream->index;
// write the compressed frame to the media file
_lastPacket = DateTime.UtcNow;
ret = ffmpeg.av_interleaved_write_frame(_formatContext, &packet);
}
}
ffmpeg.av_free_packet(&packet);
if (!_isAudio)
{
_alertData.Append(string.Format(CultureInfo.InvariantCulture, "{0:0.000},", Math.Min(level, 100)));
}
if (level > _maxLevel)
{
MaxAlarm = level;
MaxFrame?.Dispose();
MaxFrame = (Bitmap)frame.Clone();
_maxLevel = level;
}
if (ret != 0)
{
throw new Exception("Error while writing video frame (" + ret + ")");
}
}
public static extern int av_image_get_buffer_size(AVPixelFormat pix_fmt, int width, int height, int align);
private unsafe AVFrame *GetFrame(byte[] bytes, out int width, out int height, out AVPixelFormat pixFormat)
{
var webcamFormatContext = ffmpeg.avformat_alloc_context();
var webcamByteReader = new ByteReader();
var bufSize = 1048576u;
var webcamBuffer = ffmpeg.av_malloc(bufSize);
var webcamAllocContext = ffmpeg.avio_alloc_context((byte *)webcamBuffer, (int)bufSize, 0, null, webcamByteReader.ReadFunc, null, webcamByteReader.SeekFunc);
if (webcamAllocContext == null)
{
throw new NullReferenceException(nameof(webcamAllocContext));
}
webcamFormatContext->pb = webcamAllocContext;
{
webcamByteReader.Buffer = bytes;
// Decode image from byte array;
ffmpeg.avformat_open_input(&webcamFormatContext, "nofile.jpg", null, null).ThrowExceptionIfError();
ffmpeg.avformat_find_stream_info(webcamFormatContext, null).ThrowExceptionIfError();
var webcamCodecCtx = webcamFormatContext->streams[0]->codec;
AVCodec *webcamCodec = ffmpeg.avcodec_find_decoder(webcamCodecCtx->codec_id);
AVPacket pkt;
try
{
ffmpeg.avcodec_open2(webcamCodecCtx, webcamCodec, null).ThrowExceptionIfError();
var webcamFrame = ffmpeg.av_frame_alloc();
while (ffmpeg.av_read_frame(webcamFormatContext, &pkt).ThrowExceptionIfError() >= 0)
{
if (pkt.stream_index != 0)
{
continue;
}
int error = 0;
do
{
ffmpeg.avcodec_send_packet(webcamCodecCtx, &pkt).ThrowExceptionIfError();
ffmpeg.avcodec_receive_frame(webcamCodecCtx, webcamFrame).ThrowExceptionIfError();
} while (error == ffmpeg.AVERROR(ffmpeg.EAGAIN));
error.ThrowExceptionIfError();
width = webcamCodecCtx->width;
height = webcamCodecCtx->height;
pixFormat = webcamCodecCtx->pix_fmt;
return(webcamFrame);
}
}
finally
{
GC.KeepAlive(webcamByteReader);
ffmpeg.avcodec_close(webcamCodecCtx);
ffmpeg.avformat_close_input(&webcamFormatContext);
ffmpeg.avformat_free_context(webcamFormatContext);
ffmpeg.av_free(webcamAllocContext->buffer); // webcamBuffer seems like realloc'ed
ffmpeg.avio_context_free(&webcamAllocContext);
ffmpeg.av_packet_unref(&pkt);
}
width = 0;
height = 0;
pixFormat = 0;
return(null);
}
}
public static extern int sws_isSupportedOutput(AVPixelFormat pix_fmt);
public static extern int avpicture_get_size(AVPixelFormat pix_fmt, int width, int height);
public static extern SwsContext* sws_getCachedContext(SwsContext* context, int srcW, int srcH, AVPixelFormat srcFormat, int dstW, int dstH, AVPixelFormat dstFormat, int flags, SwsFilter* srcFilter, SwsFilter* dstFilter, double* param);
public ImageEncode(AVPixelFormat pixelFormat, int width, int height)
{
PixelFormat = pixelFormat;
Width = width;
Height = height;
}