■ FFMpeg을 사용해 웹 카메라를 사용하는 방법을 보여준다.
▶ FFMpegHelper.cs
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using System; using System.IO; using System.Runtime.InteropServices; using FFmpeg.AutoGen; namespace TestProject { /// <summary> /// FFMPEG 헬퍼 /// </summary> public static class FFMpegHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Import ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region DLL 디렉토리 설정하기 - SetDllDirectory(directoryPath) /// <summary> /// DLL 디렉토리 설정하기 /// </summary> /// <param name="directoryPath">디렉토리 경로</param> /// <returns>처리 결과</returns> [DllImport("kernel32", SetLastError = true)] private static extern bool SetDllDirectory(string directoryPath); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// LD_LIBRARY_PATH /// </summary> private const string LD_LIBRARY_PATH = "LD_LIBRARY_PATH"; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 등록하기 - Register() /// <summary> /// 등록하기 /// </summary> public static void Register() { switch(Environment.OSVersion.Platform) { case PlatformID.Win32NT : case PlatformID.Win32S : case PlatformID.Win32Windows : { string currentDirectoryPath = Environment.CurrentDirectory; while(currentDirectoryPath != null) { string dllDirectoryPath = Path.Combine(currentDirectoryPath, "FFMpegDLL"); if(Directory.Exists(dllDirectoryPath)) { Register(dllDirectoryPath); return; } currentDirectoryPath = Directory.GetParent(currentDirectoryPath)?.FullName; } break; } case PlatformID.Unix : case PlatformID.MacOSX : { string dllDirectoryPath = Environment.GetEnvironmentVariable(LD_LIBRARY_PATH); Register(dllDirectoryPath); break; } } } #endregion #region 에러 메시지 구하기 - GetErrorMessage(errorCode) /// <summary> /// 에러 메시지 구하기 /// </summary> /// <param name="errorCode">에러 코드</param> /// <returns>에러 메시지</returns> public static unsafe string GetErrorMessage(int errorCode) { int bufferSize = 1024; byte* buffer = stackalloc byte[bufferSize]; ffmpeg.av_strerror(errorCode, buffer, (ulong)bufferSize); string message = Marshal.PtrToStringAnsi((IntPtr)buffer); return message; } #endregion #region 에러시 예외 던지기 - ThrowExceptionIfError(error) /// <summary> /// 에러시 예외 던지기 /// </summary> /// <param name="errorCode">에러 코드</param> /// <returns>에러 코드</returns> public static int ThrowExceptionIfError(this int errorCode) { if(errorCode < 0) { throw new ApplicationException(GetErrorMessage(errorCode)); } return errorCode; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 등록하기 - Register(dllDirectoryPath) /// <summary> /// 등록하기 /// </summary> /// <param name="dllDirectoryPath">DLL 디렉토리 경로</param> private static void Register(string dllDirectoryPath) { switch(Environment.OSVersion.Platform) { case PlatformID.Win32NT : case PlatformID.Win32S : case PlatformID.Win32Windows : SetDllDirectory(dllDirectoryPath); break; case PlatformID.Unix : case PlatformID.MacOSX : string currentValue = Environment.GetEnvironmentVariable(LD_LIBRARY_PATH); if(string.IsNullOrWhiteSpace(currentValue) == false && currentValue.Contains(dllDirectoryPath) == false) { string newValue = currentValue + Path.PathSeparator + dllDirectoryPath; Environment.SetEnvironmentVariable(LD_LIBRARY_PATH, newValue); } break; } } #endregion } } |
▶ VideoFrameConverter.cs
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using System; using System.Runtime.InteropServices; using System.Windows; using FFmpeg.AutoGen; namespace TestProject { /// <summary> /// 비디오 프레임 컨버터 /// </summary> public sealed unsafe class VideoFrameConverter : IDisposable { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 타겟 크기 /// </summary> private readonly Size targetSize; /// <summary> /// 컨텍스트 /// </summary> private readonly SwsContext* context; /// <summary> /// 버퍼 핸들 /// </summary> private readonly IntPtr buferHandle; /// <summary> /// 임시 프레임 데이터 /// </summary> private readonly byte_ptrArray4 temporaryFrameData; /// <summary> /// 임시 프레임 라인 크기 /// </summary> private readonly int_array4 temporaryFrameLineSize; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - VideoFrameConverter(sourceSize, sourcePixelFormat, targetSize, targetPixelFormat) /// <summary> /// 생성자 /// </summary> /// <param name="sourceSize">소스 크기</param> /// <param name="sourcePixelFormat">소스 픽셀 포맷</param> /// <param name="targetSize">타겟 크기</param> /// <param name="targetPixelFormat">타겟 픽셀 포맷</param> public VideoFrameConverter(Size sourceSize, AVPixelFormat sourcePixelFormat, Size targetSize, AVPixelFormat targetPixelFormat) { this.targetSize = targetSize; this.context = ffmpeg.sws_getContext ( (int)sourceSize.Width, (int)sourceSize.Height, sourcePixelFormat, (int)targetSize.Width, (int)targetSize.Height, targetPixelFormat, ffmpeg.SWS_FAST_BILINEAR, null, null, null ); if(this.context == null) { throw new ApplicationException("Could not initialize the conversion context."); } int bufferSize = ffmpeg.av_image_get_buffer_size(targetPixelFormat, (int)targetSize.Width, (int)targetSize.Height, 1); this.buferHandle = Marshal.AllocHGlobal(bufferSize); this.temporaryFrameData = new byte_ptrArray4(); this.temporaryFrameLineSize = new int_array4(); ffmpeg.av_image_fill_arrays ( ref this.temporaryFrameData, ref this.temporaryFrameLineSize, (byte*)this.buferHandle, targetPixelFormat, (int)targetSize.Width, (int)targetSize.Height, 1 ); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 변환하기 - Convert(sourceFrame) /// <summary> /// 변환하기 /// </summary> /// <param name="sourceFrame">소스 프레임</param> /// <returns>프레임</returns> public AVFrame Convert(AVFrame sourceFrame) { ffmpeg.sws_scale ( this.context, sourceFrame.data, sourceFrame.linesize, 0, sourceFrame.height, this.temporaryFrameData, this.temporaryFrameLineSize ); byte_ptrArray8 targetFrameData = new byte_ptrArray8(); targetFrameData.UpdateFrom(this.temporaryFrameData); int_array8 targetFrameLineSize = new int_array8(); targetFrameLineSize.UpdateFrom(this.temporaryFrameLineSize); return new AVFrame { data = targetFrameData, linesize = targetFrameLineSize, width = (int)this.targetSize.Width, height = (int)this.targetSize.Height }; } #endregion #region 리소스 해제하기 - Dispose() /// <summary> /// 리소스 해제하기 /// </summary> public void Dispose() { Marshal.FreeHGlobal(this.buferHandle); ffmpeg.sws_freeContext(this.context); } #endregion } } |
▶ VideoStreamDecoder.cs
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using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Windows; using FFmpeg.AutoGen; namespace TestProject { /// <summary> /// 비디오 스트림 디코더 /// </summary> public sealed unsafe class VideoStreamDecoder : IDisposable { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 포맷 컨텍스트 /// </summary> private readonly AVFormatContext* formatContext; /// <summary> /// 스트림 인덱스 /// </summary> private readonly int streamIndex; /// <summary> /// 코덱 컨텍스트 /// </summary> private readonly AVCodecContext* codecContext; /// <summary> /// 패킷 /// </summary> private readonly AVPacket* packet; /// <summary> /// 프레임 /// </summary> private readonly AVFrame* frame; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 코덱명 - CodecName /// <summary> /// 코덱명 /// </summary> public string CodecName { get; } #endregion #region 프레임 크기 - FrameSize /// <summary> /// 프레임 크기 /// </summary> public Size FrameSize { get; } #endregion #region 픽셀 포맷 - PixelFormat /// <summary> /// 픽셀 포맷 /// </summary> public AVPixelFormat PixelFormat { get; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - VideoStreamDecoder(device) /// <summary> /// 생성자 /// </summary> /// <param name="device">장치</param> public VideoStreamDecoder(string device) { this.formatContext = ffmpeg.avformat_alloc_context(); AVFormatContext* formatContext = this.formatContext; ffmpeg.avdevice_register_all(); AVInputFormat* inputFormat = ffmpeg.av_find_input_format("dshow"); ffmpeg.avformat_open_input(&formatContext, device, inputFormat, null).ThrowExceptionIfError(); ffmpeg.avformat_find_stream_info(this.formatContext, null).ThrowExceptionIfError(); AVStream* stream = null; for(var i = 0; i < this.formatContext->nb_streams; i++) { if(this.formatContext->streams[i]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO) { stream = this.formatContext->streams[i]; break; } } if(stream == null) { throw new InvalidOperationException("Could not found video stream."); } this.streamIndex = stream->index; this.codecContext = stream->codec; AVCodecID codecID = this.codecContext->codec_id; AVCodec* codec = ffmpeg.avcodec_find_decoder(codecID); if(codec == null) { throw new InvalidOperationException("Unsupported codec."); } ffmpeg.avcodec_open2(this.codecContext, codec, null).ThrowExceptionIfError(); CodecName = ffmpeg.avcodec_get_name(codecID); FrameSize = new Size(this.codecContext->width, this.codecContext->height); PixelFormat = this.codecContext->pix_fmt; this.packet = ffmpeg.av_packet_alloc(); this.frame = ffmpeg.av_frame_alloc(); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 컨텍스트 정보 딕셔너리 구하기 - GetContextInfoDictionary() /// <summary> /// 컨텍스트 정보 딕셔너리 구하기 /// </summary> /// <returns>컨텍스트 정보 딕셔너리</returns> public IReadOnlyDictionary<string, string> GetContextInfoDictionary() { AVDictionaryEntry* dictionaryEntry = null; Dictionary<string, string> resultDictionary = new Dictionary<string, string>(); while((dictionaryEntry = ffmpeg.av_dict_get(this.formatContext->metadata, "", dictionaryEntry, ffmpeg.AV_DICT_IGNORE_SUFFIX)) != null) { string key = Marshal.PtrToStringAnsi((IntPtr)dictionaryEntry->key ); string value = Marshal.PtrToStringAnsi((IntPtr)dictionaryEntry->value); resultDictionary.Add(key, value); } return resultDictionary; } #endregion #region 다음 프레임 디코드 시도하기 - TryDecodeNextFrame(frame) /// <summary> /// 다음 프레임 디코드 시도하기 /// </summary> /// <param name="frame">프레임</param> /// <returns>처리 결과</returns> public bool TryDecodeNextFrame(out AVFrame frame) { ffmpeg.av_frame_unref(this.frame); int errorCode; do { try { do { errorCode = ffmpeg.av_read_frame(this.formatContext, this.packet); if(errorCode == ffmpeg.AVERROR_EOF) { frame = *this.frame; return false; } errorCode.ThrowExceptionIfError(); } while(this.packet->stream_index != this.streamIndex); ffmpeg.avcodec_send_packet(this.codecContext, this.packet).ThrowExceptionIfError(); } finally { ffmpeg.av_packet_unref(this.packet); } errorCode = ffmpeg.avcodec_receive_frame(this.codecContext, this.frame); } while(errorCode == ffmpeg.AVERROR(ffmpeg.EAGAIN)); errorCode.ThrowExceptionIfError(); frame = *this.frame; return true; } #endregion #region 리소스 해제하기 - Dispose() /// <summary> /// 리소스 해제하기 /// </summary> public void Dispose() { ffmpeg.av_frame_unref(this.frame); ffmpeg.av_free(this.frame); ffmpeg.av_packet_unref(this.packet); ffmpeg.av_free(this.packet); ffmpeg.avcodec_close(this.codecContext); AVFormatContext* formatContext = this.formatContext; ffmpeg.avformat_close_input(&formatContext); } #endregion } } |
▶ MainWindow.xaml
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<Window x:Class="TestProject.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="800" Height="600" Title="FFMpeg을 사용해 웹 카메라 사용하기" FontFamily="나눔고딕코딩" FontSize="16"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Border Grid.Row="0" Margin="10" BorderThickness="1" BorderBrush="Black"> <Image Name="image" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" /> </Border> <Button Name="playButton" Grid.Row="1" Margin="0 0 10 10" HorizontalAlignment="Right" Width="100" Height="30" Content="재생" /> </Grid> </Window> |
▶ MainWindow.xaml.cs
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using System; using System.Collections.Generic; using System.ComponentModel; using System.IO; using System.Linq; using System.Runtime.InteropServices; using System.Threading; using System.Windows; using System.Windows.Media.Imaging; using System.Windows.Threading; using FFmpeg.AutoGen; namespace TestProject { /// <summary> /// 메인 윈도우 /// </summary> public partial class MainWindow : Window { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 디스패처 /// </summary> private Dispatcher dispatcher = Application.Current.Dispatcher; /// <summary> /// 장치명 /// </summary> private string deviceName = "USB2.0 PC CAMERA"; /// <summary> /// 스레드 /// </summary> private Thread thread; /// <summary> /// 스레드 실행 여부 /// </summary> private bool isThreadRunning; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainWindow() /// <summary> /// 생성자 /// </summary> public MainWindow() { InitializeComponent(); FFMpegHelper.Register(); Closing += Window_Closing; this.playButton.Click += playButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 윈도우 닫을 경우 처리하기 - Window_Closing(sender, e) /// <summary> /// 윈도우 닫을 경우 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Window_Closing(object sender, CancelEventArgs e) { if(this.thread.IsAlive) { this.isThreadRunning = false; this.thread.Join(); } } #endregion #region 재생 버튼 클릭시 처리하기 - playButton_Click(sender, e) /// <summary> /// 재생 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void playButton_Click(object sender, RoutedEventArgs e) { if(this.isThreadRunning) { this.isThreadRunning = false; } else { this.isThreadRunning = true; this.thread = new Thread(ProcessThread); this.thread.Start(); } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 로그 콜백 설정하기 - SetLogCallback() /// <summary> /// 로그 콜백 설정하기 /// </summary> private static unsafe void SetLogCallback() { ffmpeg.av_log_set_level(ffmpeg.AV_LOG_VERBOSE); av_log_set_callback_callback callback = (p0, level, format, vl) => { if(level > ffmpeg.av_log_get_level()) { return; } int lineSize = 1024; byte* lineBuffer = stackalloc byte[lineSize]; int printPrefix = 1; ffmpeg.av_log_format_line(p0, level, format, vl, lineBuffer, lineSize, &printPrefix); string line = Marshal.PtrToStringAnsi((IntPtr)lineBuffer); }; ffmpeg.av_log_set_callback(callback); } #endregion #region 이미지 소스 설정하기 - SetImageSource(bitmap) /// <summary> /// 이미지 소스 설정하기 /// </summary> /// <param name="bitmap">비트맵</param> private void SetImageSource(System.Drawing.Bitmap bitmap) { this.dispatcher.BeginInvoke((Action)(() => { using(MemoryStream memoryStream = new MemoryStream()) { if(this.thread.IsAlive) { bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Bmp); memoryStream.Position = 0; BitmapImage bitmapimage = new BitmapImage(); bitmapimage.BeginInit(); bitmapimage.CacheOption = BitmapCacheOption.OnLoad; bitmapimage.StreamSource = memoryStream; bitmapimage.EndInit(); this.image.Source = bitmapimage; } } })); } #endregion #region 스레드 처리하기 - ProcessThread() /// <summary> /// 스레드 처리하기 /// </summary> private unsafe void ProcessThread() { using(VideoStreamDecoder decoder = new VideoStreamDecoder($"video={this.deviceName}")) { IReadOnlyDictionary<string, string> contextInfoDictionary = decoder.GetContextInfoDictionary(); contextInfoDictionary.ToList().ForEach(x => Console.WriteLine($"{x.Key} = {x.Value}")); Size sourceSize = decoder.FrameSize; AVPixelFormat sourcePixelFormat = decoder.PixelFormat; Size targetSize = sourceSize; AVPixelFormat targetPixelFormat = AVPixelFormat.AV_PIX_FMT_BGR24; using(VideoFrameConverter converter = new VideoFrameConverter(sourceSize, sourcePixelFormat, targetSize, targetPixelFormat)) { int frameNumber = 0; while(decoder.TryDecodeNextFrame(out AVFrame sourceFrame) && isThreadRunning) { AVFrame targetFrame = converter.Convert(sourceFrame); System.Drawing.Bitmap bitmap; bitmap = new System.Drawing.Bitmap ( targetFrame.width, targetFrame.height, targetFrame.linesize[0], System.Drawing.Imaging.PixelFormat.Format24bppRgb, (IntPtr)targetFrame.data[0] ); SetImageSource(bitmap); frameNumber++; } } } } #endregion } } |
※ 32비트 버전 컴파일시, FFMpegDLL 폴더에 있는 DLL 파일들을 www.FFmpeg.org의 32비트 버전 파일들로 대체하고 컴파일한다.
