WPF桌面端开发-音视频录制、获取缩略图(使用AForge)

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WPF桌面端开发-音视频录制、获取缩略图(使用AForge)

前言

不建议使用，版本较老，.net framework4.5.2不兼容。

AForge包括

  • AForge
  • AForge.Video
  • AForge.Video.FFMPEG
  • AForge.Video.DirectShow

官方文档

NAudio

https://github.com/naudio/NAudio

安装

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Install-Package AForge.Video.DirectShow -Version 2.2.5
Install-Package AForge.Video.FFMPEG -Version 2.2.5.1-rc

视频录制

FFMPEG音视频均可录制 后两者只能录制视频

安装

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Install-Package AForge.Video.DirectShow -Version 2.2.5
Install-Package AForge.Video.FFMPEG -Version 2.2.5.1-rc

其中

  • AForge.Video.FFMPEG负责文件的写入。

  • AForge.Video获取桌面的帧，这个库在AForge.Video.FFMPEG的依赖中，会自动安装。

  • AForge.Video.DirectShow可以获取摄像头的帧，如果不录制摄像头，可以不用安装这个

音频录制

音频录制使用了NAudio库

安装

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Install-Package NAudio -Version 1.9.0

音视频合并

音视频合成使用了NReco.VideoConverter库，这个库本质也是用FFMpeg进行音视频合并的。

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Install-Package NReco -Version 2.0.3.0
Install-Package NReco.VideoConverter -Version 1.1.4

音频处理

使用NAudio

安装

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Install-Package NAudio -Version 1.9.0

麦克风列表

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using NAudio.Wave;
public static void GetAudioMicrophone2()
{
    for (int n = -1;
         n < WaveIn.DeviceCount;
         n++)
    {
        var caps = WaveIn.GetCapabilities(n);
        Console.WriteLine($@"{n}: {caps.ProductName}");
    }
}

打印如下

-1: Microsoft Sound Mapper
0: 麦克风 (Realtek(R) Audio)

注意上面是从-1开始遍历的，我们获取麦克风设备的时候可以从0遍历。

方式2

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using NAudio.CoreAudioApi;

public static void GetAudioMicrophone2()
{
    MMDeviceEnumerator enumerator = new MMDeviceEnumerator();

    //获取音频输出设备
    IEnumerable<MMDevice> speakDevices =
        enumerator.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active).ToArray();
    var mmDevices = speakDevices.ToList();
    foreach (MMDevice device in mmDevices)
    {
        int volume = Convert.ToInt16(device.AudioEndpointVolume.MasterVolumeLevelScalar * 100);
        Console.WriteLine($@"{device.FriendlyName} 声音大小:{volume}");
    }
}

扬声器列表

获取默认的扬声器及其声音大小

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using NAudio.CoreAudioApi;

public static void GetAudioLoudspeaker2()
{
    MMDeviceEnumerator enumerator = new MMDeviceEnumerator();

    //获取音频输出设备
    IEnumerable<MMDevice> speakDevices =
        enumerator.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active).ToArray();
    var mmDevices = speakDevices.ToList();
    foreach (MMDevice device in mmDevices)
    {
        int volume = Convert.ToInt16(device.AudioEndpointVolume.MasterVolumeLevelScalar * 100);
        Console.WriteLine($@"{device.FriendlyName} 声音大小:{volume}");
    }
}

结果

PHL 271V8 (NVIDIA High Definition Audio) 声音大小:100
扬声器/听筒 (Realtek(R) Audio) 声音大小:29

默认的麦克风和扬声器

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var defaultCaptureDevice = WasapiCapture.GetDefaultCaptureDevice();
Console.WriteLine($@"默认麦克风:{defaultCaptureDevice.FriendlyName}");
var defaultLoopbackCaptureDevice = WasapiLoopbackCapture.GetDefaultLoopbackCaptureDevice();
Console.WriteLine($@"默认扬声器:{defaultLoopbackCaptureDevice.FriendlyName}");

获取麦克风实时音量

xaml

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<ProgressBar
             BorderThickness="0"
             Maximum="100"
             Name="VolumeProgressBar" />

代码

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// 定义
private WaveInEvent waveIn = null;

private void AudioMonitor()
{
  if (WaveIn.DeviceCount == 0)
  {
    return;
  }
  // 启动采集
  waveIn = new WaveInEvent();
  //开始录音，写数据
  waveIn.DataAvailable += (o, e1) =>
  {
    byte[] buf = e1.Buffer;
    float maxNumber = 0;
    for (int index = 0; index < buf.Length; index += 2)
    {
      short sample = (short)((buf[index + 1] << 8) | buf[index + 0]);
      float sample32 = sample / 32768f;
      sample32 = Math.Abs(sample32);

      if (sample32 > maxNumber)
      {
        maxNumber = sample32;
      }
    }

    Dispatcher.Invoke(
      () =>
      {
        VolumeProgressBar.Value = maxNumber * 100;
      });
  };

  //结束录音
  waveIn.RecordingStopped += (s, a) =>
  {
    waveIn.Dispose();
  };

  waveIn.StartRecording();
}

停止

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// 停止时调用
if (waveIn != null)
{
    waveIn.StopRecording();
}

获取麦克风列表

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for (int n = -1; n < WaveIn.DeviceCount; n++)
{
    var caps = WaveIn.GetCapabilities(n);
    Console.WriteLine($"{n}: {caps.ProductName}");
}

打印如下

-1: Microsoft 声音映射器
0: 麦克风 (Realtek(R) Audio)

注意上面是从-1开始遍历的，我们获取麦克风设备的时候可以从0遍历。

设置麦克风

设置对应的索引

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waveIn.DeviceNumber = 0;

官方文档

https://github.com/naudio/NAudio/blob/master/Docs/RecordingLevelMeter.md

获取扬声器实时音量

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// 定义
private WasapiLoopbackCapture capture = null; //new WasapiLoopbackCapture();

// 启动采集
capture = new WasapiLoopbackCapture();

capture.DataAvailable += (s, e1) =>
{
    byte[] buf = e1.Buffer;
    float maxNumber = 0;
    for (int index = 0; index < buf.Length; index += 2)
    {
        short sample = (short)((buf[index + 1] << 8) | buf[index + 0]);
        float sample32 = sample / 32768f;
        sample32 = Math.Abs(sample32);

        if (sample32 > maxNumber)
        {
            maxNumber = sample32;
        }
    }

    Console.WriteLine("maxNumber" + maxNumber);
};
//结束录音
capture.RecordingStopped += (s, a) =>
{
    capture.Dispose();
};
capture.StartRecording();

if(capture!=null){
    capture.StopRecording();
}

注意

获取扬声器声音大小不受系统声音设置大小影响，所以要想获取真实用户听到的声音大小要用 采集的声音大小*扬声器设置的声音大小

设置扬声器的音量

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private void SetCurrentSpeakerVolume(int volume)
{
    var enumerator = new MMDeviceEnumerator();
    IEnumerable<MMDevice> speakDevices = enumerator.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active).ToArray();
    if (speakDevices.Count() > 0)
    {
        MMDevice mMDevice = speakDevices.ToList()[0];
        mMDevice.AudioEndpointVolume.MasterVolumeLevelScalar = volume / 100.0f;
        Console.WriteLine("设置的扬声器为：" + mMDevice.FriendlyName);
        Console.WriteLine("设置的扬声器声音大小为：" + volume);
    }
}

录制麦克风和扬声器

录制麦克风

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namespace ZUtils
{
    using System;
    using System.IO;
    using System.Threading;

    using NAudio.Wave;
    public class ZRecordMicrophoneHelper
    {
        public enum RecordState
        {
            Stop = 0,
            Start = 1,
            Pause = 2
        }


        private RecordState _state;

        //录制麦克风的声音
        private readonly WaveInEvent _waveIn; //new WaveInEvent();

        private Action<string> _stopAction;


        //生成音频文件的对象

        public ZRecordMicrophoneHelper(string filePath)
        {
            WaveFileWriter writer;

            var audioFile = filePath;
            _state = RecordState.Pause;
            try
            {
                _waveIn = new WaveInEvent();
                writer = new WaveFileWriter(audioFile, _waveIn.WaveFormat);
                //开始录音，写数据
                _waveIn.DataAvailable += (s, a) =>
                {
                    if (_state == RecordState.Start)
                    {
                        writer.Write(a.Buffer, 0, a.BytesRecorded);
                    }
                };

                //结束录音
                _waveIn.RecordingStopped += (s, a) =>
                {
                    writer.Dispose();
                    writer = null;
                    _waveIn.Dispose();
                    _stopAction?.Invoke(audioFile);
                };

                _waveIn.StartRecording();
            }
            catch (Exception)
            {
                // ignored
            }
        }

        /// <summary>
        /// 开始录制
        /// </summary>
        public void StartRecordAudio()
        {
            _state = RecordState.Start;
        }

        /// <summary>
        /// 结束录制
        /// </summary>
        public void StopRecordAudio(Action<string> stopAction)
        {
            _stopAction = stopAction;
            _state = RecordState.Stop;
            _waveIn.StopRecording();
        }

        /// <summary>
        /// 暂停录制
        /// </summary>
        public void PauseRecordAudio()
        {
            _state = RecordState.Pause;
        }

        /// <summary>
        /// 恢复录制
        /// </summary>
        public void ResumeRecordAudio()
        {
            _state = RecordState.Start;
        }

        /// <summary>
        /// 设备是否可用
        /// </summary>
        /// <returns></returns>
        public static bool IsDeviceGood()
        {
            string tempPath = Path.GetTempPath();

            WaveInEvent mWaveIn;
            WaveFileWriter mWriter = null;
            try
            {
                string mAudioFile = Path.Combine(tempPath, "_microphone.mp3");

                mWaveIn = new WaveInEvent();
                mWriter = new WaveFileWriter(mAudioFile, mWaveIn.WaveFormat);
                //开始录音，写数据
                var writer = mWriter;
                mWaveIn.DataAvailable += (s, a) =>
                {
                    writer.Write(a.Buffer, 0, a.BytesRecorded);
                };

                //结束录音
                mWaveIn.RecordingStopped += (s, a) =>
                {
                    writer.Dispose();

                    mWriter = null;
                    mWaveIn.Dispose();

                    if (File.Exists(mAudioFile))
                    {
                        File.Delete(mAudioFile);
                    }
                };

                mWaveIn.StartRecording();

                ThreadPool.QueueUserWorkItem(o =>
                {
                    Thread.Sleep(200);
                    mWaveIn.StopRecording();
                });
            }
            catch (Exception)
            {
                if (mWriter != null)
                {
                    mWriter.Dispose();
                    mWriter = null;
                }

                return false;
            }

            return true;
        }
    }
}

注意

这里在初始化类的时候就直接调用录制了，原因在于，如果同时录制音视频的时候，同时开启的时候，由于硬件原因导致启动的时间有先后从而会导致声画不同步。

后文中的视频录制也是同样的原因。

录制扬声器

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using System;
using System.IO;
using System.Threading;

using NAudio.Wave;

namespace ZUtils
{
    public class ZRecordLoudspeakerHelper
    {
        public enum RecordState
        {
            Stop = 0,
            Start = 1,
            Pause = 2
        }

        private RecordState _state;

        //录制扬声器的声音
        private readonly WasapiLoopbackCapture _capture; 

        private Action<string> _stopAction;

        public ZRecordLoudspeakerHelper(string filePath)
        {
            WaveFileWriter writer;

            var audioFile = filePath;
            _state = RecordState.Pause;
            try
            {
                _capture = new WasapiLoopbackCapture();
                writer = new WaveFileWriter(audioFile, _capture.WaveFormat);

                _capture.DataAvailable += (s, a) =>
                {
                    if (_state == RecordState.Start)
                    {
                        writer.Write(a.Buffer, 0, a.BytesRecorded);
                    }
                };
                //结束录音
                _capture.RecordingStopped += (s, a) =>
                {
                    writer.Dispose();
                    writer = null;
                    _capture.Dispose();
                    _stopAction?.Invoke(audioFile);
                };
                _capture.StartRecording();
            }
            catch (Exception)
            {
                // ignored
            }
        }

        /// <summary>
        /// 开始录制
        /// </summary>
        public void StartRecordAudio()
        {
            _state = RecordState.Start;
        }

        /// <summary>
        /// 结束录制
        /// </summary>
        public void StopRecordAudio(Action<string> stopAction)
        {
            _stopAction = stopAction;
            _state = RecordState.Stop;
            _capture.StopRecording();
        }

        /// <summary>
        /// 暂停录制
        /// </summary>
        public void PauseRecordAudio()
        {
            _state = RecordState.Pause;
        }

        /// <summary>
        /// 恢复录制
        /// </summary>
        public void ResumeRecordAudio()
        {
            _state = RecordState.Start;
        }

        /// <summary>
        /// 设备是否可用
        /// </summary>
        /// <returns></returns>
        public static bool IsDeviceGood()
        {
            string tempPath = Path.GetTempPath();

            WaveFileWriter mWriter = null;
            WasapiLoopbackCapture mCapture;
            try
            {
                string mAudioFile = Path.Combine(tempPath, "_loudspeaker.mp3");
                mCapture = new WasapiLoopbackCapture();
                mWriter = new WaveFileWriter(mAudioFile, mCapture.WaveFormat);

                var writer = mWriter;
                mCapture.DataAvailable += (s, a) =>
                {
                    writer.Write(a.Buffer, 0, a.BytesRecorded);
                };
                //结束录音
                mCapture.RecordingStopped += (s, a) =>
                {
                    writer.Dispose();

                    mWriter = null;
                    mCapture.Dispose();

                    if (File.Exists(mAudioFile))
                    {
                        File.Delete(mAudioFile);
                    }
                };
                mCapture.StartRecording();
                ThreadPool.QueueUserWorkItem(o =>
                {
                    Thread.Sleep(200);
                    mCapture.StopRecording();
                });
            }
            catch (Exception)
            {
                if (mWriter != null)
                {
                    mWriter.Dispose();
                    mWriter = null;
                }
                return false;
            }

            return true;
        }
    }
}

音频状态获取

改变系统音量

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[DllImport("user32.dll")]
static extern void keybd_event(byte bVk, byte bScan, UInt32 dwFlags, UInt32 dwExtraInfo);
 
[DllImport("user32.dll")]
static extern Byte MapVirtualKey(UInt32 uCode, UInt32 uMapType);
 
private const byte VK_VOLUME_MUTE = 0xAD;
private const byte VK_VOLUME_DOWN = 0xAE;
private const byte VK_VOLUME_UP = 0xAF;
private const UInt32 KEYEVENTF_EXTENDEDKEY = 0x0001;
private const UInt32 KEYEVENTF_KEYUP = 0x0002;
 
/// <summary>
/// 改变系统音量大小，增加
/// </summary>
public void VolumeUp()
{
    keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY, 0);
    keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}
 
/// <summary>
/// 改变系统音量大小，减小
/// </summary>
public void VolumeDown()
{
    keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY, 0);
    keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}
 
/// <summary>
/// 改变系统音量大小，静音
/// </summary>
public void Mute()
{
    keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY, 0);
    keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}

改变软件音量

改变软件音量 但不改变系统音量

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[DllImport("Winmm.dll")]
private static extern int waveOutSetVolume(int hwo, System.UInt32 pdwVolume);

[DllImport("Winmm.dll")]
private static extern uint waveOutGetVolume(int hwo, out System.UInt32 pdwVolume);  

private int volumeMinScope = 0;
private int volumeMaxScope = 100;
private int volumeSize = 100;

/// <summary>
/// 音量控制，但不改变系统音量设置
/// </summary>
public int VolumeSize
{
    get { return volumeSize; }
    set { volumeSize = value; }
}

public void SetCurrentVolume()
{
    if (volumeSize < 0)
    {
        volumeSize = 0;
    }

    if (volumeSize > 100)
    {
        volumeSize = 100;
    }

    //先把trackbar的value值映射到0x0000～0xFFFF范围
    System.UInt32 Value = (System.UInt32)((double)0xffff * (double)volumeSize / (double)(volumeMaxScope - volumeMinScope));


    //限制value的取值范围
    if (Value < 0)
    {
        Value = 0;
    }

    if (Value > 0xffff)
    {
        Value = 0xffff;
    }

    System.UInt32 left = (System.UInt32)Value;//左声道音量
    System.UInt32 right = (System.UInt32)Value;//右
    waveOutSetVolume(0, left << 16 | right); //"<<"左移，“|”逻辑或运算
}

设置默认音频设备

目前还没有用代码设置默认音频设备的方法

打开系统声音设置，让用户操作

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Process.Start("mmsys.cpl");

摄像头

摄像头列表

获取摄像头列表

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/// <summary>
/// 获取所有的摄像头
/// </summary>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static List<FilterInfo> GetAllVideoDevice()
{
    var devs = new FilterInfoCollection(FilterCategory.VideoInputDevice); //获取摄像头列表
    if (devs == null) throw new ArgumentNullException(nameof(devs));
    List<FilterInfo> devices = new List<FilterInfo>();
    foreach (FilterInfo dev in devs)
    {
        devices.Add(dev);
    }
    return devices;
}

/// <summary>
/// 获取所有的摄像头 排除虚拟设备
/// </summary>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static List<FilterInfo> GetAllVideoDeviceSys()
{
    var devs = new FilterInfoCollection(FilterCategory.VideoInputDevice); //获取摄像头列表
    if (devs == null) throw new ArgumentNullException(nameof(devs));
    List<FilterInfo> devices = new List<FilterInfo>();
    foreach (FilterInfo dev in devs)
    {
        if (dev.Name != "screen-capture-recorder" && dev.Name != "OBS Virtual Camera")
        {
            devices.Add(dev);
        }
    }
    return devices;
}

注意

new VideoCaptureDevice(CameraName)中 CameraName传入的是MonikerString

显示的时候使用Name

摄像头画面

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if (CmbCameraList.SelectedIndex >= 0)
{
    var info = CmbCameraList.SelectedItem as FilterInfo;
    _camera = new VideoCaptureDevice(info.MonikerString);
    //配置录像参数(宽,高,帧率,比特率等参数)VideoCapabilities这个属性会返回摄像头支持哪些配置
    _camera.VideoResolution = _camera.VideoCapabilities[0];
    _camera.NewFrame +=
        Camera_NewFrame; //设置回调,aforge会不断从这个回调推出图像数据,SnapshotFrame也是有待比较
    _camera.Start(); //打开摄像头
}

private void Camera_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
    Dispatcher.Invoke
    (
        () =>
        {
            MemoryStream ms = new MemoryStream();
            eventArgs.Frame.Save(ms, ImageFormat.Bmp);
            BitmapImage image = new BitmapImage();
            image.BeginInit();
            image.StreamSource = new MemoryStream(ms.GetBuffer());
            ms.Close();
            image.EndInit();
            imgPlayer.Source = image;
        }
    ); //同步显示
}

我的方案

安装相关依赖

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Install-Package AForge.Video.DirectShow -Version 2.2.5
Install-Package AForge.Video.FFMPEG -Version 2.2.5.1-rc

Install-Package NAudio -Version 1.9.0

Install-Package NReco -Version 2.0.3.0
Install-Package NReco.VideoConverter -Version 1.1.4

重新安装所有依赖

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Update-Package –reinstall

添加系统依赖

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<Reference Include="System.Drawing" />

其中

  • AForge视频处理
  • NAudio 音频处理
  • NReco 音视频合并

音视频分开录制 音频如果麦克风和扬声器都录制的话，也要分开录制，最后再合并所有的流。

视频录制

桌面录制

工具类

整体

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using System;
using System.Runtime.InteropServices;
using AForge.Video;
using AForge.Video.FFMPEG;


namespace z_recorder_aforge.Uitls
{
    public class ZRecordVideoHelper
    {
        public enum RecordState
        {
            Stop = 0,
            Start = 1,
            Pause = 2
        }

        private RecordState _state;

        private readonly bool _captureMouse;

        private readonly VideoFileWriter _videoWriter = new VideoFileWriter(); //视频写入
        private readonly ScreenCaptureStream _videoStreamer; //视频捕获

        public ZRecordVideoHelper
        (
            string filePath,
            int width,
            int height,
            int rate = 5,
            int quality = 8,
            bool captureMouse = false
        )
        {
            var width1 = width / 2 * 2;
            var height1 = height / 2 * 2;
            var rate1 = rate;
            _captureMouse = captureMouse;

            _state = RecordState.Pause;
            try
            {
                // 打开写入
                lock (this)
                {
                    _videoWriter.Open
                    (
                        filePath,
                        width1,
                        height1,
                        rate1,
                        VideoCodec.MPEG4,
                        width1 * height1 * quality
                    );
                }

                System.Drawing.Rectangle rec = new System.Drawing.Rectangle
                (
                    0,
                    0,
                    width1,
                    height1
                );
                _videoStreamer = new ScreenCaptureStream(rec, 1000 / rate1); //帧间隔需要和帧率关联，不然录的10秒视频文件不是10s
                _videoStreamer.NewFrame += VideoNewFrame;
                _videoStreamer.Start();
            }
            catch (Exception)
            {
                // ignored
            }
        }

        /// <summary>
        /// 开始录制
        /// </summary>
        public bool StartRecordVideo()
        {
            _state = RecordState.Start;
            return true;
        }

        [DllImport("user32.dll")]
        private static extern bool GetCursorInfo(out Cursorinfo pci);

        [StructLayout(LayoutKind.Sequential)]
        private struct Point
        {
            public Int32 x;
            public Int32 y;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct Cursorinfo
        {
            public Int32 cbSize;
            public Int32 flags;
            public IntPtr hCursor;
            public Point ptScreenPos;
        }

        // 帧返回时绘制上鼠标
        private void VideoNewFrame(object sender, NewFrameEventArgs e)
        {
            if (_state == RecordState.Start)
            {
                if (_captureMouse)
                {
                    var g = System.Drawing.Graphics.FromImage(e.Frame);
                    Cursorinfo pci;
                    pci.cbSize = Marshal.SizeOf(typeof(Cursorinfo));
                    GetCursorInfo(out pci);
                    try
                    {
                        System.Windows.Forms.Cursor cur = new System.Windows.Forms.Cursor(pci.hCursor);
                        cur.Draw
                        (
                            g,
                            new System.Drawing.Rectangle
                            (
                                System.Windows.Forms.Cursor.Position.X - 10,
                                System.Windows.Forms.Cursor.Position.Y - 10,
                                cur.Size.Width,
                                cur.Size.Height
                            )
                        );
                    }
                    catch
                    {
                        // ignored
                    } //打开任务管理器时会导致异常
                }

                lock (this)
                {
                    _videoWriter.WriteVideoFrame(e.Frame);
                }
            }
        }

        /// <summary>
        /// 结束录制
        /// </summary>
        public void StopRecordVideo()
        {
            _state = RecordState.Stop;
            // 停止
            _videoStreamer.Stop();

            //结束写入
            lock (this)
            {
                _videoWriter.Close();
                _videoWriter.Dispose();
            }
        }

        /// <summary>
        /// 暂停录制
        /// </summary>
        public void PauseRecordVideo()
        {
            _state = RecordState.Pause;
        }

        /// <summary>
        /// 恢复录制
        /// </summary>
        public void ResumeRecordVideo()
        {
            _state = RecordState.Start;
        }
    }
}

绘制光标

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[DllImport("user32.dll")]
private static extern bool GetCursorInfo
(
    out Cursorinfo pci
);

[StructLayout(LayoutKind.Sequential)]
private struct Point
{
    public int x;
    public int y;
}

[StructLayout(LayoutKind.Sequential)]
private struct Cursorinfo
{
    public int cbSize;
    public int flags;
    public IntPtr hCursor;
    public Point ptScreenPos;
}

// 帧返回时绘制上鼠标
private void VideoNewFrame
(
    object sender,
    NewFrameEventArgs e
)
{
    if (State == RecordState.Start)
    {
        if (_captureMouse)
        {
            var g = Graphics.FromImage(e.Frame);
            Cursorinfo pci;
            pci.cbSize = Marshal.SizeOf(typeof(Cursorinfo));
            GetCursorInfo(out pci);
            try
            {
                System.Windows.Forms.Cursor cur = new System.Windows.Forms.Cursor(pci.hCursor);
                cur.Draw(
                    g,
                    new Rectangle(
                        System.Windows.Forms.Cursor.Position.X - 10,
                        System.Windows.Forms.Cursor.Position.Y - 10,
                        cur.Size.Width,
                        cur.Size.Height
                    )
                );
            }
            catch
            {
                // ignored
            } //打开任务管理器时会导致异常
        }
        lock (WriterLock)
        {
            _videoWriter.WriteVideoFrame(e.Frame);
        }
    }
}

绘制圆点

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// 帧返回时绘制上圆点
private void VideoNewFrame
(
    object sender,
    NewFrameEventArgs e
)
{
    if (State == RecordState.Start)
    {
        if (_captureMouse)
        {
            var g = Graphics.FromImage(e.Frame);

            // 创建一个红色的画刷
            Brush brush = new SolidBrush(Color.Red);
            g.FillEllipse(
                brush,
                System.Windows.Forms.Cursor.Position.X - 5,
                System.Windows.Forms.Cursor.Position.Y - 5,
                10,
                10
            );
        }
        lock (WriterLock)
        {
            _videoWriter.WriteVideoFrame(e.Frame);
        }
    }
}

调用方式

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// 当前窗体指针
IntPtr winHandle = new WindowInteropHelper(this).Handle;
var curScreen = Screen.FromHandle(winHandle);
int RecordWidth = curScreen.Bounds.Width;
int RecordHeight = curScreen.Bounds.Height;

//桌面录制
ZRecordVideoHelper helper3 = null;
helper3 = new ZRecordVideoHelper(TempVideoPathName, RecordWidth, RecordHeight);
helper3.StartRecordVideo();

//暂停录制
helper3.PauseRecordVideo();

//恢复录制
helper3.ResumeRecordVideo();

//结束录制
helper3.StopRecordVideo();

视频写入

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using AForge.Video.FFMPEG;

private VideoFileWriter videoWriter = new VideoFileWriter();//视频写入

// 打开写入
lock (this)
{
    videoWriter.Open(
        curVideoPath,
        RecordWidth,
        RecordHeight,
        视频帧率,
        VideoCodec.MPEG4,
        RecordWidth * RecordHeight * 视频质量(最大10)
    );
}

//写入一帧
videoWriter.WriteVideoFrame(bitmap);

//结束写入
videoWriter.Close();

注意以下几点

  • Open时传入的宽高要和写入时的宽高保持一致。
  • 宽高必须是2的整数倍。
  • Open视频文件时，请加上全局锁，否则多线程并发有异常抛出。
  • Close视频文件时，请使用Open的全局锁，否则会在Open 时出现AccessViolationException异常。

桌面流读取

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using AForge.Video;
private ScreenCaptureStream videoStreamer;//视频捕获

System.Drawing.Rectangle rec = new System.Drawing.Rectangle(0,0,RecordWidth,RecordHeight);
videoStreamer = new ScreenCaptureStream(rec, 1000 / 10);//帧间隔需要和帧率关联，不然录的10秒视频文件不是10s
videoStreamer.NewFrame += VideoNewFrame;
videoStreamer.Start();

// 帧返回时绘制上鼠标
private void VideoNewFrame(object sender, NewFrameEventArgs e)
{
    videoWriter.WriteVideoFrame(e.Frame);
}

// 停止
videoStreamer.Stop();

组件录制

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/// <summary>
/// 保存图片
/// </summary>
/// <param name="ui">需要截图的UI控件</param>
/// <param name="filePathName">图片保存地址 命名 1.png</param>
/// <param name="ImgWidth">转换后高</param>
/// <param name="ImgHeight">转换后高</param>
public static void SaveUI(FrameworkElement ui, string filePathName, int ImgWidth, int ImgHeight)
{
    Console.WriteLine("截图的路径为:" + filePathName);
    try
    {
        RenderTargetBitmap bmp = new RenderTargetBitmap(
            (int)ui.ActualWidth,
            (int)ui.ActualHeight,
            1 / 96, 1 / 96,
            PixelFormats.Default
        );
        bmp.Render(ui);
        BitmapEncoder encoder = new PngBitmapEncoder();
        encoder.Frames.Add(BitmapFrame.Create(bmp));
        if (ImgWidth > 0)
        {
            MemoryStream memoryStream = new MemoryStream();
            encoder.Save(memoryStream);
            Bitmap bit = new Bitmap(memoryStream, true);
            Bitmap Img = new Bitmap(bit, ImgWidth, ImgHeight);
            Img.Save(filePathName);
            Img.Dispose();
            bit.Dispose();
            memoryStream.Dispose();
        }
        else
        {
            using (var stream = new FileStream(filePathName, FileMode.Create))
            {
                encoder.Save(stream);
            }
        }
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
    }
}

public static void SaveUI2(FrameworkElement frameworkElement, string filePathName)
{
    System.IO.FileStream fs = new System.IO.FileStream(filePathName, System.IO.FileMode.Create);
    RenderTargetBitmap bmp = new RenderTargetBitmap((int)frameworkElement.ActualWidth, (int)frameworkElement.ActualHeight, 1 / 96, 1 / 96, PixelFormats.Default);
    bmp.Render(frameworkElement);
    BitmapEncoder encoder = new PngBitmapEncoder();
    encoder.Frames.Add(BitmapFrame.Create(bmp));
    encoder.Save(fs);
    fs.Close();
}

public static Bitmap SaveUI2Bitmap(FrameworkElement frameworkElement, int width, int height)
{
    using (MemoryStream outStream = new MemoryStream())
    {
        RenderTargetBitmap bmp = new RenderTargetBitmap(
            (int)frameworkElement.ActualWidth,
            (int)frameworkElement.ActualHeight,
            1 / 96, 
            1 / 96,
            PixelFormats.Default
        );
        bmp.Render(frameworkElement);
        BitmapEncoder enc = new PngBitmapEncoder();
        enc.Frames.Add(BitmapFrame.Create(bmp));
        enc.Save(outStream);

        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(outStream);
        return new Bitmap(bitmap, width, height);
    }
}

摄像头录制

录制

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using AForge.Video;
using AForge.Video.DirectShow;
using AForge.Video.FFMPEG;

private VideoCaptureDevice Camera;//用来操作摄像头
private VideoFileWriter VideoOutPut;//用来把每一帧图像编码到视频文件
private string CameraName;
private bool isParsing;
private int frameCount;//介于0和frame之间计数用
private int frame;//抽帧提速：手动将摄像头的帧率将到10帧，30帧的时候每3帧抽一帧出来


lock (this) //打开录像文件(如果没有则创建,如果有也会清空),这里还有关于
{
    VideoOutPut = new VideoFileWriter();
    VideoOutPut.Open(
        CameraSavePath,
        Camera.VideoResolution.FrameSize.Width,
        Camera.VideoResolution.FrameSize.Height,
        10,
        VideoCodec.MSMPEG4v3,//为了减小高帧率时视频失速，强制为10帧
        Camera.VideoResolution.FrameSize.Width * Camera.VideoResolution.FrameSize.Height * SettingHelp.Settings.视频质量
    );
}

frameCount = 0;
Camera = new VideoCaptureDevice(CameraName);
//配置录像参数(宽,高,帧率,比特率等参数)VideoCapabilities这个属性会返回摄像头支持哪些配置
Camera.VideoResolution = Camera.VideoCapabilities[0];
frame = Camera.VideoResolution.AverageFrameRate / 10;

Camera.NewFrame += Camera_NewFrame;//设置回调,aforge会不断从这个回调推出图像数据,SnapshotFrame也是有待比较
Camera.Start();//打开摄像头


/// <summary>
/// 摄像头输出回调
/// </summary>
private void Camera_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
    if (!isParsing)
    {
        Dispatcher.Invoke(new Action(
            () =>
            {
                MemoryStream ms = new MemoryStream();
                eventArgs.Frame.Save(ms, ImageFormat.Bmp);
                BitmapImage image = new BitmapImage();
                image.BeginInit();
                image.StreamSource = new MemoryStream(ms.GetBuffer());
                ms.Close();
                image.EndInit();
                imgCamera.Source = image;
            }));//同步显示
        frameCount += 1;//抽帧提速：因为写入速度的影响高帧率时处理不及时30帧可能需要2s，但是视频认为30帧为1s最终导致视频为加速状态
        if (frameCount == frame)
        {
            frameCount = 0;
            VideoOutPut.WriteVideoFrame(eventArgs.Frame);
        }
    }
}


if (Camera != null) {
    Camera.SignalToStop();
}

音视频合并

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using NReco.VideoConverter;

FFMpegConverter ffMpeg = new FFMpegConverter();
ffMpeg.ConvertProgress += FfMpeg_ConvertProgress;
FFMpegInput[] input = new FFMpegInput[] {
    new FFMpegInput(tempVideo),
    new FFMpegInput(tempAudio),
    new FFMpegInput(tempAudio2),
};
string OutFilePath = "D:\test.mp4";
// 多路音频混音
ffMpeg.ConvertMedia(
    input,
    OutFilePath,
    "mp4",
    new OutputSettings()
    {
        CustomOutputArgs = "-filter_complex amix=inputs=2:duration=longest:dropout_transition=2"
    }
);

private void FfMpeg_ConvertProgress(object sender, ConvertProgressEventArgs e){
    Dispatcher.Invoke(
        () =>
        {
            waitBar.Value = e.Processed.TotalSeconds * 10 / e.TotalDuration.TotalSeconds;
        }
    );
}

参数说明

  • amix=inputs=2 : 表示混音文件个数 , 有 2 个文件进行混音 ;

  • duration=longest : 设置混音时间对齐策略 , longest 表示最长的音频文件持续时间 , shortest 表示最短输入的持续时间 , first 表示第一个文件的持续时间 ;

  • dropout_transition=2 : 表示输入流结束时 , 音量从满音量到 0 音量渐弱 2 秒消失 ;

生成缩略图

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/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="mp4Path"></param>
/// <param name="picPath"></param>
public static void GetVideoPic(string mp4Path, string picPath)
{
    using (var video = new VideoFileReader())
    {
        video.Open(mp4Path);
        int frameNum = video.FrameCount > 3 ? 3 : 0;
        using (var bmp = video.ReadVideoFrame(frameNum))
        {
            SaveAsJpeg(bmp, picPath, 90);
        }
        video.Close();
    }
}

// 保存为jpeg格式，quality为图像质量（0-100）
public static void SaveAsJpeg(Bitmap bitmap, string fileName, int quality)
{
    var jpegEncoder = ImageCodecInfo.GetImageEncoders().First(codec => codec.FormatID == ImageFormat.Jpeg.Guid);
    var encoderParameters = new EncoderParameters(1);
    encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, quality);
    bitmap.Save(fileName, jpegEncoder, encoderParameters);
}

获取视频时长

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/// <summary>
/// 获取视频时长
/// </summary>
/// <param name="mp4Path"></param>
/// <returns></returns>
public static string GetDuration(string mp4Path)
{
    string durationStr;
    using (var reader = new VideoFileReader())
    {
        reader.Open(mp4Path);

        double duration = reader.FrameCount / reader.FrameRate.Value;
        TimeSpan timeSpan = TimeSpan.FromSeconds(duration);
        durationStr = timeSpan.ToString(@"hh\:mm\:ss");
        reader.Close();
    }

    return durationStr;
}

音视频录制工具类

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/*
*┌────────────────────────────────────────────────┐
*│　描    述：ZRecordManager
*│　作    者：剑行者
*│　版    本：1.0
*│　创建时间：2023/2/15 15:51:49
*└────────────────────────────────────────────────┘
*/

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Interop;

using NAudio.CoreAudioApi;
using NAudio.Wave;

using NReco.VideoConverter;

namespace ZUtils
{
    public class ZRecordManager
    {
        /// <summary>
        /// 是否有麦克风
        /// </summary>
        private readonly bool _hasMicrophone;

        /// <summary>
        /// 是否有扬声器
        /// </summary>
        private readonly bool _hasLoudspeaker;

        //录制麦克风的声音
        private readonly ZRecordMicrophoneHelper _helper1;

        //录制扬声器的声音
        private readonly ZRecordLoudspeakerHelper _helper2;

        private readonly ZRecordVideoHelper _helper3;

        private readonly string _tempVideoPathName;
        private readonly string _tempAudioPathName1;
        private readonly string _tempAudioPathName2;

        private readonly string _imagePath;

        private readonly string _savePath;

        private bool _audio01Finish;
        private bool _audio02Finish;

        /// <summary>
        /// 视频路径、缩略图路径、时长、进度
        /// </summary>
        private readonly Action<string, string, string, double> _callback;

        public ZRecordManager(string savePath, Window window, Action<string, string, string, double> callback)
        {
            _callback = callback;
            IntPtr winHandle = new WindowInteropHelper(window).Handle;
            var curScreen = Screen.FromHandle(winHandle);
            int recordWidth = curScreen.Bounds.Width;
            int recordHeight = curScreen.Bounds.Height;
            _savePath = savePath;

            FileInfo fi = new FileInfo(savePath);
            var di = fi.Directory;
            if (di is { Exists: false })
            {
                di.Create();
            }

            _tempVideoPathName = savePath + "_v.mp4";
            _tempAudioPathName1 = savePath + "_a1.mp3";
            _tempAudioPathName2 = savePath + "_a2.mp3";
            _imagePath = savePath + ".jpg";

            if (WaveIn.DeviceCount > 0)
            {
                _hasMicrophone = true;
                _helper1 = new ZRecordMicrophoneHelper(_tempAudioPathName1);
            }
            else
            {
                _hasMicrophone = false;
            }

            MMDeviceEnumerator enumerator = new MMDeviceEnumerator();

            //获取音频输出设备
            IEnumerable<MMDevice> speakDevices = enumerator.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active).ToArray();
            if (speakDevices.Any())
            {
                _hasLoudspeaker = true;
                _helper2 = new ZRecordLoudspeakerHelper(_tempAudioPathName2);
            }
            else
            {
                _hasLoudspeaker = false;
            }

            _helper3 = new ZRecordVideoHelper(_tempVideoPathName, recordWidth, recordHeight);
        }

        public void Start()
        {
            if (_hasMicrophone)
            {
                _helper1.StartRecordAudio();
            }

            if (_hasLoudspeaker)
            {
                _helper2.StartRecordAudio();
            }

            _helper3.StartRecordVideo();
        }

        public void Stop()
        {
            if (_hasMicrophone)
            {
                _helper1.StopRecordAudio((path) =>
                {
                    _audio01Finish = true;
                });
            }

            if (_hasLoudspeaker)
            {
                _helper2.StopRecordAudio((path) =>
                {
                    _audio02Finish = true;
                });
            }

            _helper3.StopRecordVideo();

            new Thread(o =>
                {
                    Merge();
                })
                .Start();
        }

        public void Pause()
        {
            if (_hasMicrophone)
            {
                _helper1.PauseRecordAudio();
            }

            if (_hasLoudspeaker)
            {
                _helper2.PauseRecordAudio();
            }

            _helper3.PauseRecordVideo();
        }

        public void Resume()
        {
            if (_hasMicrophone)
            {
                _helper1.ResumeRecordAudio();
            }

            if (_hasLoudspeaker)
            {
                _helper2.ResumeRecordAudio();
            }

            _helper3.ResumeRecordVideo();
        }

        private void Merge()
        {
            if (!_audio01Finish)
            {
                Thread.Sleep(100);
                Merge();
                return;
            }

            if (!_audio02Finish)
            {
                Thread.Sleep(100);
                Merge();
                return;
            }

            Console.WriteLine(@"音视频合并");
            if (_hasMicrophone && _hasLoudspeaker)
            {
                FFMpegConverter ffmpeg = new FFMpegConverter();
                ffmpeg.ConvertProgress += FfMpeg_ConvertProgress;
                FFMpegInput[] input =
                {
                    new FFMpegInput(_tempVideoPathName), new FFMpegInput(_tempAudioPathName1),
                    new FFMpegInput(_tempAudioPathName2),
                };

                // 多路音频混音
                ffmpeg.ConvertMedia(
                    input,
                    _savePath,
                    Format.mp4,
                    new OutputSettings
                    {
                        CustomOutputArgs = "-filter_complex amix=inputs=2:duration=longest:dropout_transition=2"
                    }
                );
            }
            else if (_hasMicrophone && !_hasLoudspeaker)
            {
                FFMpegConverter ffmpeg = new FFMpegConverter();
                ffmpeg.ConvertProgress += FfMpeg_ConvertProgress;
                FFMpegInput[] input = { new FFMpegInput(_tempVideoPathName), new FFMpegInput(_tempAudioPathName1), };

                // 多路音频混音
                ffmpeg.ConvertMedia(
                    input,
                    _savePath,
                    Format.mp4,
                    new OutputSettings
                    {
                        CustomOutputArgs = "-filter_complex amix=inputs=1:duration=longest:dropout_transition=2"
                    }
                );
            }
            else if (!_hasMicrophone && _hasLoudspeaker)
            {
                FFMpegConverter ffmpeg = new FFMpegConverter();
                ffmpeg.ConvertProgress += FfMpeg_ConvertProgress;
                FFMpegInput[] input = { new FFMpegInput(_tempVideoPathName), new FFMpegInput(_tempAudioPathName2), };

                // 多路音频混音
                ffmpeg.ConvertMedia(
                    input,
                    _savePath,
                    Format.mp4,
                    new OutputSettings
                    {
                        CustomOutputArgs = "-filter_complex amix=inputs=1:duration=longest:dropout_transition=2"
                    }
                );
            }
            else
            {
                if (File.Exists(_savePath))
                {
                    File.Move(_tempVideoPathName, _savePath);
                }

                Console.WriteLine(@"只有视频获取封面");
                FinishAction();
            }
        }

        /// <summary>
        /// 生成缩略图、时长结束
        /// </summary>
        private void FinishAction()
        {
            GenerateThumbnails(_savePath, _imagePath);
            string duration = GetVideoDuration(_savePath);
            _callback(_savePath, _imagePath, duration, 100);
        }

        private void FfMpeg_ConvertProgress(object sender, ConvertProgressEventArgs e)
        {
            double progress = e.Processed.TotalSeconds * 100 / e.TotalDuration.TotalSeconds;
            if (progress - 100.0 != 0)
            {
                return;
            }

            if (File.Exists(_tempAudioPathName1))
            {
                try
                {
                    File.Delete(_tempAudioPathName1);
                }
                catch (Exception)
                {
                    Console.WriteLine(@"删除麦克风音频失败");
                }
            }

            if (File.Exists(_tempAudioPathName2))
            {
                try
                {
                    File.Delete(_tempAudioPathName2);
                }
                catch (Exception)
                {
                    Console.WriteLine(@"删除扬声器音频失败");
                }
            }

            if (File.Exists(_tempVideoPathName))
            {
                try
                {
                    File.Delete(_tempVideoPathName);
                }
                catch (Exception)
                {
                    Console.WriteLine(@"删除视频失败");
                }
            }

            Console.WriteLine(@"合并完成获取封面");
            FinishAction();
        }
    }
}

调用

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IsRecording = !IsRecording;
string savePath = ZConfig.configLocal.savePath;

string pathAll = Path.Combine(savePath, DateTime.Now.ToString("yyyyMMddHHmmss") + ".mp4");

_recordManager = new ZRecordManager(
    pathAll, 
    this, 
    (mp4, image, duration, progress) =>
    {
        if (progress - 100.0 == 0)
        {
            string name = Path.GetFileNameWithoutExtension(mp4);
            ZRecordModel recordModel = new ZRecordModel
            {
                Name = name,
                MP4Path = mp4,
                Pic = image,
                Duration = duration,
                RecordTime = DateTime.Now.ToString("MM月dd日 HH:mm:ss")
            };
            Console.WriteLine(@"name:" + name);
            Console.WriteLine(@"mp4:" + mp4);
            Console.WriteLine(@"image:" + image);
            Console.WriteLine(@"duration:" + duration);
            ZCommonData.recordList.Add(recordModel);
        }
    }
);

打开系统声音设置

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Process.Start("mmsys.cpl");

调用本地播放

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Process pro = new Process
{
  StartInfo = new ProcessStartInfo(videoPath)
};
pro.Start();

音视频参数计算

音频

采样率和比特率(码率)之间的公式如下：

比特率 = 采样率 × 样本深度 × 声道数

AudioBitRate = SampleRate × bits × channels

其中，采样率表示每秒钟采集的样本数，单位为Hz（赫兹）；样本深度表示每个采样值所占的位数，通常为16或24位；声道数表示音频信号的通道数，通常为单声道或立体声。

例如，对于一段立体声音乐，采样率为44100Hz，样本深度为16位，声道数为2，则它的比特率为：

比特率 = 44100 × 16 × 2 = 1411200 bit/s = 1.41 Mbps

采样率为44100Hz，样本深度为16位，声道数为1，则它的比特率为：

比特率 = 44100 × 16 × 1 = 705600 bit/s

因为

1 byte = 8 bits

所以上面的示例1s产生的byte为

1411200 / 8 = 176400

音频计算中使用到的参数

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//帧率
private readonly int _frameRate;

//音频采样率
private readonly int _audioSampleRate = 44100;

//音频位深
private readonly int _audioBits = 16;

//音频声道数
private readonly int _audioChannels = 1;

音频的比特率

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比特率 = 采样率 * 位深 * 声道数
audioBitRate = _audioSampleRate * _audioBits * _audioChannels;

音频帧大小

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音频帧大小 = 比特率 * 1秒 / 8 / 声道数 / 帧率
audioFrameSize = audioBitRate * 1 / 8 / _audioChannels / _frameRate 
    = _audioSampleRate * _audioBits * _audioChannels * 1 / 8 / 2 / _frameRate
    = _audioSampleRate * _audioBits * _audioChannels / 16 / _frameRate

其中比特率 * 1秒 / 8为1秒的byte数。