wpf 使用FFmpeg推送h264视频类

这里提供一个使用 FFmpeg 推送 H264 视频的 C# 类示例，供你参考。请注意，这只是一个概述，具体实现可能会因你的需求而异。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using FFmpeg.AutoGen;
using System.IO;

namespace FFmpegPusher
{
    public class FFmpegPusher
    {
        private static readonly object syncLock = new object();
        private bool isInitialized = false;
        private AVFormatContext* outputFormatContext = null;
        private AVStream* videoStream = null;
        private AVCodecContext* videoCodecContext = null;
        private AVFrame* videoFrame = null;
        private AVPacket* videoPacket = null;
        private byte[] videoBuffer = null;
        private int videoBufferSize = 0;
        private int videoFrameCount = 0;

        public FFmpegPusher()
        {
            // 初始化 FFmpeg 库
            lock (syncLock)
            {
                if (!isInitialized)
                {
                    avformat.av_register_all();
                    avformat.avformat_network_init();
                    isInitialized = true;
                }
            }
        }

        public void Open(string url, int width, int height, int frameRate, int bitRate)
        {
            // 打开输出流
            avformat.avformat_alloc_output_context2(&outputFormatContext, null, "flv", url);
            if (outputFormatContext == null)
            {
                throw new Exception("Failed to allocate output context");
            }

            // 打开视频流
            var codec = avcodec.avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264);
            if (codec == null)
            {
                throw new Exception("Failed to find H264 encoder");
            }
            videoStream = avformat.avformat_new_stream(outputFormatContext, codec);
            if (videoStream == null)
            {
                throw new Exception("Failed to allocate video stream");
            }
            videoCodecContext = videoStream->codec;
            videoCodecContext->codec_id = codec->id;
            videoCodecContext->codec_type = AVMediaType.AVMEDIA_TYPE_VIDEO;
            videoCodecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;
            videoCodecContext->width = width;
            videoCodecContext->height = height;
            videoCodecContext->bit_rate = bitRate;
            videoCodecContext->time_base = new AVRational { num = 1, den = frameRate };
            videoCodecContext->gop_size = frameRate;
            videoCodecContext->qmin = 10;
            videoCodecContext->qmax = 51;
            videoCodecContext->max_b_frames = 0;
            if (outputFormatContext->oformat->flags.HasFlag(AVFormatFlag.AVFMT_GLOBALHEADER))
            {
                videoCodecContext->flags |= AVCodecFlag.AV_CODEC_FLAG_GLOBAL_HEADER;
            }
            avcodec.avcodec_open2(videoCodecContext, codec, null);

            // 分配视频帧和数据包
            videoFrame = avutil.av_frame_alloc();
            videoFrame->format = (int)videoCodecContext->pix_fmt;
            videoFrame->width = videoCodecContext->width;
            videoFrame->height = videoCodecContext->height;
            avutil.av_frame_get_buffer(videoFrame, 32);
            videoPacket = avutil.av_packet_alloc();

            // 打开输出流
            avio.avio_open(&outputFormatContext->pb, url, AVIOFlag.AVIO_FLAG_WRITE);
            avformat.avformat_write_header(outputFormatContext, null);
        }

        public void PushFrame(byte[] data)
        {
            if (videoBuffer == null)
            {
                videoBuffer = new byte[avutil.av_image_get_buffer_size(videoCodecContext->pix_fmt, videoCodecContext->width, videoCodecContext->height, 32)];
                videoBufferSize = videoBuffer.Length;
            }

            fixed (byte* src = data)
            {
                avutil.av_image_fill_arrays(videoFrame->data, videoFrame->linesize, src, videoCodecContext->pix_fmt, videoCodecContext->width, videoCodecContext->height, 32);
            }
            videoFrame->pts = videoFrameCount++;
            avcodec.avcodec_send_frame(videoCodecContext, videoFrame);
            while (avcodec.avcodec_receive_packet(videoCodecContext, videoPacket) == 0)
            {
                videoPacket->stream_index = videoStream->index;
                avformat.av_write_frame(outputFormatContext, videoPacket);
                avutil.av_packet_unref(videoPacket);
            }
        }

        public void Close()
        {
            avcodec.avcodec_send_frame(videoCodecContext, null);
            while (avcodec.avcodec_receive_packet(videoCodecContext, videoPacket) == 0)
            {
                videoPacket->stream_index = videoStream->index;
                avformat.av_write_frame(outputFormatContext, videoPacket);
                avutil.av_packet_unref(videoPacket);
            }
            av_write_trailer(outputFormatContext);
            avio.avio_close(outputFormatContext->pb);
            avcodec.avcodec_free_context(&videoCodecContext);
            avformat.avformat_free_context(outputFormatContext);
            av_frame_free(&videoFrame);
            av_packet_free(&videoPacket);
            videoBuffer = null;
            videoBufferSize = 0;
            videoFrameCount = 0;
        }
    }
}

在代码中，我们使用 FFmpeg 库的 API 来创建一个输出流，打开视频流，并将 H264 数据推送到输出流中。具体实现细节请参考代码中的注释。在 WPF 应用程序中，你可以使用该类来推送 H264 视频流。