DxPackNet 4.保存音视频为本地avi文件

捕获到了音视频后要保存到本地文件，这是很常见的应用场景,DxPackNet保存视频文件也比较简单

用 IAviStreamWriter  avi文件写入流即可

1.初始化相关设备，设定好数据捕获的回调函数

        DxDeviceCollection cameras;
        IDxCameraCapture camCapture;
        IDxMicrophCapture microphone;
        IAviStreamWriter aviWriter;
        private void Form1_Load(object sender, EventArgs e)
        {
            cameras = DxFactory.CreateDxCompent<DxDeviceCollection>(DxDeviceCollection.ENVIRONMENT_CAMERAS);
            camCapture = DxFactory.CreateDxCompent<IDxCameraCapture>(this, panel1);
            camCapture.FrameCb = camerasFrameCb;
            camCapture.Init(cameras[0]);
            microphone = DxFactory.CreateDxCompent<IDxMicrophCapture>(100);
            microphone.AudioCb = auCaptureBufferCB;
        }

2.创建avi写入流 打开设备

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            //创建avi文件写入流 第一个参数为-写入文件路径  第二个参数为-是否支持音频写入,true为音/视频,false为只写视频
            aviWriter = DxFactory.CreateDxCompent<IAviStreamWriter>("c:\avicaptest.avi", true);
            aviWriter.Width = 640;//设置视频宽度
            aviWriter.Height = 480;//设置视频高度
            aviWriter.CompressType = AviVideoCompressType.MicrosoftVideo1; //设置视频压缩格式
            aviWriter.Open();//打开写入流
            microphone.Open();
            microphone.Start();
            camCapture.Run();
        }

3.在回调中写入音/视频 数据

        private void auCaptureBufferCB(byte[] buffer, int length)
        {
            //写入音频数据 
            aviWriter.WriteWavBuffer(buffer, length);  
        }
        private void camerasFrameCb(byte[] buffer, int size)
        {
            //写入视频数据
            aviWriter.WriteBmpBuffer(buffer, Math.Max(size, 640 * 480 * 3));
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button2.Enabled = false;
            microphone.Stop();
            camCapture.Stop();
            aviWriter.Dispose();//写入完了记得关闭流
            aviWriter = null;
        }