我能够在 WasapiLoopbackCapture (naudio) 的帮助下捕获由扬声器生成的系统音频。但问题是它捕获 wav 文件并且 wav 文件的大小非常大(几乎 10 到 15 MB/分钟)。我必须捕获 2-3 小时的音频,这太长了。
我正在寻找一种解决方案,将 WasapiLoopbackCapture 捕获的 wav 流转换为 MP3,然后将其保存到磁盘。我尝试使用 LAME.exe 或其他解决方案,但没有成功。任何工作代码。
这是我的代码:
private void button1_Click(object sender, EventArgs e){
LoopbackRecorder obj = new LoopbackRecorder();
string a = textBox1.Text;
obj.StartRecording(@"e:\aman.mp3");
}
public class LoopbackRecorder
{
private IWaveIn _waveIn;
private Mp3WaveFormat _mp3format;
private WaveFormat _wavFormat;
private WaveFileWriter _writer;
private bool _isRecording = false;
/// <summary>
/// Constructor
/// </summary>
public LoopbackRecorder()
{
}
/// <summary>
/// Starts the recording.
/// </summary>
/// <param name="fileName"></param>
public void StartRecording(string fileName)
{
// If we are currently record then go ahead and exit out.
if (_isRecording == true)
{
return;
}
_fileName = fileName;
_waveIn = new WasapiLoopbackCapture();
// _waveIn.WaveFormat = new WaveFormat(16000, 16 , 2);
_writer = new WaveFileWriter(fileName, _waveIn.WaveFormat);
_waveIn.DataAvailable += OnDataAvailable;
// _waveIn.RecordingStopped += OnRecordingStopped;
_waveIn.StartRecording();
_isRecording = true;
}
private void OnDataAvailable(object sender, WaveInEventArgs waveInEventArgs)
{
if (_writer == null)
{
_writer = new WaveFileWriter(@"e:\aman.mp3", _waveIn.WaveFormat);
}
_writer.Write(waveInEventArgs.Buffer, 0, waveInEventArgs.BytesRecorded);
byte[] by= Float32toInt16(waveInEventArgs.Buffer, 0, waveInEventArgs.BytesRecorded);
}
private string _fileName = "";
/// <summary>
/// The name of the file that was set when StartRecording was called. E.g. the current file being written to.
/// </summary>
public string FileName
{
get
{
return _fileName;
}
}
}
这是一个使用示例NAudio.Lame
(在控制台应用程序中)从声卡环回捕获数据并直接写入 MP3 文件:
using System;
using NAudio.Lame;
using NAudio.Wave;
namespace MP3Rec
{
class Program
{
static LameMP3FileWriter wri;
static bool stopped = false;
static void Main(string[] args)
{
// Start recording from loopback
IWaveIn waveIn = new WasapiLoopbackCapture();
waveIn.DataAvailable += waveIn_DataAvailable;
waveIn.RecordingStopped += waveIn_RecordingStopped;
// Setup MP3 writer to output at 32kbit/sec (~2 minutes per MB)
wri = new LameMP3FileWriter( @"C:\temp\test_output.mp3", waveIn.WaveFormat, 32 );
waveIn.StartRecording();
stopped = false;
// Keep recording until Escape key pressed
while (!stopped)
{
if (Console.KeyAvailable)
{
var key = Console.ReadKey(true);
if (key != null && key.Key == ConsoleKey.Escape)
waveIn.StopRecording();
}
else
System.Threading.Thread.Sleep(50);
}
// flush output to finish MP3 file correctly
wri.Flush();
// Dispose of objects
waveIn.Dispose();
wri.Dispose();
}
static void waveIn_RecordingStopped(object sender, StoppedEventArgs e)
{
// signal that recording has finished
stopped = true;
}
static void waveIn_DataAvailable(object sender, WaveInEventArgs e)
{
// write recorded data to MP3 writer
if (wri != null)
wri.Write(e.Buffer, 0, e.BytesRecorded);
}
}
}
此刻NAudio.Lame
NuGet 上的包仅针对 x86 进行编译,因此请确保您的应用程序设置为针对该平台。
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