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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using FFmpeg.AutoGen;
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using System.Windows;
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namespace SmartAquaViewer.Helper.FFHelper
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{
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public sealed unsafe class StreamDecoder : IDisposable
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{
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public delegate void ThreadStoppedHandler(object obj);
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public static event ThreadStoppedHandler hThreadStoppedHandler;
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private readonly AVFormatContext* _pFormatContext;
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public readonly AVFrame* _pFrame;
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private readonly AVPacket* _pPacket;
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AVCodec* codec;
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public string CodecName { get; }
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public Size FrameSize { get; }
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public AVPixelFormat PixelFormat { get; }
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public int videoStreamIndex { get; }
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public AVCodecContext* _vcodecContext { get; }
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public bool _isContextNotInitialized = false;
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public double _fps;
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public StreamDecoder(string url)
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{
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//Application.Current.Dispatcher.Invoke(() =>
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//{
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// ProgressWindow.GetInstance().Show();
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//});
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lock (this)
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{
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AVFormatContext* pFormatContext = null;
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AVCodecContext* vcodecContext = null;
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AVDictionary* options = null;
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AVStream* videoStream = null;
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try
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{
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ffmpeg.av_log_set_level(ffmpeg.AV_LOG_DEBUG);
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_pFormatContext = ffmpeg.avformat_alloc_context();
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if (_pFormatContext == null)
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{
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throw new InvalidOperationException("Failed to allocate format context.");
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}
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pFormatContext = _pFormatContext;
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// Get the codec context
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_vcodecContext = ffmpeg.avcodec_alloc_context3(codec);
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if (_vcodecContext == null)
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{
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// Out of memory
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ffmpeg.avformat_close_input(&pFormatContext);
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}
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ffmpeg.av_dict_set(&options, "stimeout", "600000000", 0); // 60 seconds timeout
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ffmpeg.av_dict_set(&options, "reconnect", "1", 0);
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ffmpeg.av_dict_set(&options, "reconnect_at_eof", "1", 0);
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ffmpeg.av_dict_set(&options, "reconnect_streamed", "1", 0);
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ffmpeg.av_dict_set(&options, "rtsp_transport", "tcp", 0);
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int ret = ffmpeg.avformat_open_input(&pFormatContext, url, null, &options).ThrowExceptionIfError();
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if (options != null)
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{
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ffmpeg.av_dict_free(&options);
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}
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ret = ffmpeg.avformat_find_stream_info(_pFormatContext, null).ThrowExceptionIfError();
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for (int i = 0; i < pFormatContext->nb_streams; i++)
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{
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if (pFormatContext->streams[i]->codecpar->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
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{
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videoStream = pFormatContext->streams[i];
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break;
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}
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}
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if (videoStream == null)
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{
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Console.WriteLine("Failed to find video stream");
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return;
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}
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AVRational frameRate = videoStream->avg_frame_rate;
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_fps = (double)frameRate.num / frameRate.den;
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videoStreamIndex = ffmpeg.av_find_best_stream(_pFormatContext, AVMediaType.AVMEDIA_TYPE_VIDEO, -1, -1, null, 0);
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int context = ffmpeg.avcodec_parameters_to_context(_vcodecContext, _pFormatContext->streams[videoStreamIndex]->codecpar).ThrowExceptionIfError();
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if (context < 0)
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{
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//Log4NetManager.GetLog().Error("StreamDecoder() : avcodec_parameters_to_context Error");
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return;
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}
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if (videoStreamIndex >= 0)
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{
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AVCodecContext* avctx = OpenStream(_vcodecContext);
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if (avctx == null)
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{
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throw new InvalidOperationException("Failed to open codec context.");
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}
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FrameSize = new Size(avctx->width, avctx->height);
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PixelFormat = avctx->pix_fmt;
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}
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else
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{
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throw new InvalidOperationException("No video stream found.");
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}
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_pPacket = ffmpeg.av_packet_alloc();
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if (_pPacket == null)
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{
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throw new InvalidOperationException("Failed to allocate packet.");
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}
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_pFrame = ffmpeg.av_frame_alloc();
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if (_pFrame == null)
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{
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throw new InvalidOperationException("Failed to allocate frame.");
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}
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}
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catch (Exception ex)
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{
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_isContextNotInitialized = true;
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//Log4NetManager.GetLog().Error("StreamDecoder() : " + ex.Message);
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MessageBox.Show("StreamDecoder() : " + ex.Message);
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if (_pFrame != null)
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{
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ffmpeg.av_frame_unref(_pFrame);
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ffmpeg.av_free(_pFrame);
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}
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if (_pPacket != null)
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{
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ffmpeg.av_packet_unref(_pPacket);
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ffmpeg.av_free(_pPacket);
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}
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if (_vcodecContext != null)
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{
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vcodecContext = _vcodecContext;
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ffmpeg.avcodec_close(vcodecContext);
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ffmpeg.avcodec_free_context(&vcodecContext);
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}
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if (_pFormatContext != null)
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{
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ffmpeg.avformat_close_input(&pFormatContext);
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ffmpeg.avformat_free_context(pFormatContext);
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}
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//Log4NetManager.GetLog().Error("StreamDecoder() : " + ex.Message);
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}
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finally
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{
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if (options != null)
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{
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ffmpeg.av_dict_free(&options);
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}
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//Application.Current.Dispatcher.Invoke(() =>
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//{
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// ProgressWindow.GetInstance().Close();
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//});
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}
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}
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}
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private AVCodecContext* OpenStream(AVCodecContext* avctx)
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{
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AVCodec* codec = ffmpeg.avcodec_find_decoder(avctx->codec_id);
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if (codec == null) throw new InvalidOperationException("No codec could be found.");
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avctx->codec_id = codec->id;
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avctx->lowres = 0;
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if (avctx->lowres > codec->max_lowres)
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avctx->lowres = codec->max_lowres;
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avctx->idct_algo = ffmpeg.FF_IDCT_AUTO;
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avctx->error_concealment = 3;
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ffmpeg.avcodec_open2(avctx, codec, null).ThrowExceptionIfError();
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return avctx;
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}
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//20240326 LHB - 원본. 안될경우 이 주석을 해제하고 아래의 함수와 교체하세요
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//public void Dispose()
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//{
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// ffmpeg.av_frame_unref(_pFrame);
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// ffmpeg.av_free(_pFrame);
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// ffmpeg.av_packet_unref(_pPacket);
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// ffmpeg.av_free(_pPacket);
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// ffmpeg.avcodec_close(_vcodecContext);
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// //ffmpeg.avcodec_close(acodecContext);
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// var pFormatContext = _pFormatContext;
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// ffmpeg.avformat_close_input(&pFormatContext);
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//}
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public void Dispose()
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{
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lock (this)
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{
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if (_pFrame != null)
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{
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ffmpeg.av_frame_unref(_pFrame);
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ffmpeg.av_free(_pFrame);
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}
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if (_pPacket != null)
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{
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ffmpeg.av_packet_unref(_pPacket);
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ffmpeg.av_free(_pPacket);
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}
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if (_vcodecContext != null && !_isContextNotInitialized)
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{
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ffmpeg.avcodec_close(_vcodecContext);
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}
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//ffmpeg.avcodec_close(acodecContext);
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if (_pFormatContext != null && !_isContextNotInitialized)
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{
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var pFormatContext = _pFormatContext;
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ffmpeg.avformat_close_input(&pFormatContext);
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ffmpeg.avformat_free_context(pFormatContext);
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}
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}
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}
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//20240326 LHB - 원본. 안될경우 이 주석을 해제하고 아래의 함수와 교체하세요
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//public bool TryDecodeNextFrame(out AVFrame frame)
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//{
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// ffmpeg.av_frame_unref(_pFrame);
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// int error = 0;
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// do
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// {
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// try
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// {
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// do
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// {
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// error = ffmpeg.av_read_frame(_pFormatContext, _pPacket);
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// if (error == ffmpeg.AVERROR_EOF)
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// {
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// frame = *_pFrame;
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// return false;
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// }
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// error.ThrowExceptionIfError();
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// } while (_pPacket->stream_index != videoStreamIndex);
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// ffmpeg.avcodec_send_packet(_vcodecContext, _pPacket).ThrowExceptionIfError();
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// }
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// catch (Exception ex)
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// {
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// Log4NetManager.GetLog().Error("TryDecodeNextFrame() : " + ex.Message);
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// MessageBox.Show("TryDecodeNextFrame() : " + ex.Message);
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// }
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// finally
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// {
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// ffmpeg.av_packet_unref(_pPacket);
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// }
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// error = ffmpeg.avcodec_receive_frame(_vcodecContext, _pFrame);
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// } while (error == ffmpeg.AVERROR(ffmpeg.EAGAIN));
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// error.ThrowExceptionIfError();
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// frame = *_pFrame;
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// return true;
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//}
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public bool TryDecodeNextFrame(out AVFrame frame)
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{
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ffmpeg.av_frame_unref(this._pFrame);
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int error;
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// repeated-try avcodec_receive_frame until enough packets haven been send
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while (true)
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{
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// try read frame; maybe last avcodec_send_packet resulted in multiple frames to be read; will respond with EAGAIN if more packets are needed
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error = ffmpeg.avcodec_receive_frame(this._vcodecContext, this._pFrame);
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if (error != ffmpeg.AVERROR(ffmpeg.EAGAIN))
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{
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frame = *this._pFrame;
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if (error == ffmpeg.AVERROR_EOF)
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return false;
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error.ThrowExceptionIfError();
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return true;
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}
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try
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{
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// feed all stream-matching packets to decoder
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while (true)
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{
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error = ffmpeg.av_read_frame(this._pFormatContext, this._pPacket);
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if (error == ffmpeg.AVERROR_EOF)
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{
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// no more packets to read -> trigger draining/flushing of remaining frames
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ffmpeg.avcodec_send_packet(this._vcodecContext, null).ThrowExceptionIfError();
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break; // don't throw error, just exit packet-feed-loop
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}
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error.ThrowExceptionIfError();
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if (this._pPacket->stream_index == this.videoStreamIndex)
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{
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var sendPacketResult = ffmpeg.avcodec_send_packet(this._vcodecContext, this._pPacket);
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if (sendPacketResult == 0)
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break;
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// no reason to abort/crash (it was just an invalid packet from demuxer) -> just retrieve and feed next packet; most of time the codec will resume without problems
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var errorMsg = Helper.av_strerror(sendPacketResult);
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Trace.TraceError(errorMsg);
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//Log4NetManager.GetLog().Error("TryDecodeNextFrame()" + " : av_strerror 오류 " + errorMsg);
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}
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// unref all packets, no matter if sent to avcodec or ignored
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ffmpeg.av_packet_unref(this._pPacket);
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine("TryDecodeNextFrame()" + ex.Message);
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if (ex.Message.Equals("End of file"))
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{
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//Log4NetManager.GetLog().Error("TryDecodeNextFrame()" + " : " + ex.Message);
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}
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//쓰레드가 망함,
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}
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finally
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{
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ffmpeg.av_packet_unref(this._pPacket);
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}
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}
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}
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public IReadOnlyDictionary<string, string> GetContextInfo()
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{
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AVDictionaryEntry* tag = null;
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var result = new Dictionary<string, string>();
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while ((tag = ffmpeg.av_dict_get(_pFormatContext->metadata, "", tag, ffmpeg.AV_DICT_IGNORE_SUFFIX)) != null)
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{
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var key = Marshal.PtrToStringAnsi((IntPtr)tag->key);
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var value = Marshal.PtrToStringAnsi((IntPtr)tag->value);
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result.Add(key, value);
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}
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return result;
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}
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}
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}
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