change format from wav to mp3 in memory stream in NAudio

问题

Hi there iam trying to convert text to speech (wav) in the memorystream convert it to mp3 and then play it on the users page.so need i help what to do next?

here is my asmx code :

[WebMethod]
public byte[] StartSpeak(string Word)
{
    MemoryStream ms = new MemoryStream();
    using (System.Speech.Synthesis.SpeechSynthesizer synhesizer = new System.Speech.Synthesis.SpeechSynthesizer())
    {
        synhesizer.SelectVoiceByHints(System.Speech.Synthesis.VoiceGender.NotSet, System.Speech.Synthesis.VoiceAge.NotSet, 0, new System.Globalization.CultureInfo("en-US"));
        synhesizer.SetOutputToWaveStream(ms);
        synhesizer.Speak(Word);
    }
    return ms.ToArray();

    }

Thanks.

回答1:

You need an MP3 compressor library. I use Lame via the Yeti Lame wrapper. You can find code and a sample project here.

Steps to get this working:

Copy the following files from MP3Compressor to your project:
- AudioWriters.cs
- Lame.cs
- Lame_enc.dll
- Mp3Writer.cs
- Mp3WriterConfig.cs
- WaveNative.cs
- WriterConfig.cs
In the project properties for Lame_enc.dll set the Copy to Output property to Copy if newer or Copy always.

Edit Lame.cs and replace all instances of:

[DllImport("Lame_enc.dll")]

with:

[DllImport("Lame_enc.dll", CallingConvention = CallingConvention.Cdecl)]`

Add the following code to your project:

public static Byte[] WavToMP3(byte[] wavFile)
{
    using (MemoryStream source = new MemoryStream(wavFile))
    using (NAudio.Wave.WaveFileReader rdr = new NAudio.Wave.WaveFileReader(source))
    {
        WaveLib.WaveFormat fmt = new WaveLib.WaveFormat(rdr.WaveFormat.SampleRate, rdr.WaveFormat.BitsPerSample, rdr.WaveFormat.Channels);

        // convert to MP3 at 96kbit/sec...
        Yeti.Lame.BE_CONFIG conf = new Yeti.Lame.BE_CONFIG(fmt, 96);

        // Allocate a 1-second buffer
        int blen = rdr.WaveFormat.AverageBytesPerSecond;
        byte[] buffer = new byte[blen];

        // Do conversion
        using (MemoryStream output = new MemoryStream())
        { 
            Yeti.MMedia.Mp3.Mp3Writer mp3 = new Yeti.MMedia.Mp3.Mp3Writer(output, fmt, conf);

            int readCount;
            while ((readCount = rdr.Read(buffer, 0, blen)) > 0)
                mp3.Write(buffer, 0, readCount);

            mp3.Close();
            return output.ToArray();
        }
    }
}

Either add a reference to System.Windows.Forms to your project (if it's not there already), or edit AudioWriter.cs and WriterConfig.cs to remove the references. Both of these have a using System.Windows.Forms; that you can remove, and WriterConfig.cs has a ConfigControl declaration that needs to be removed/commented out.

Once all of that is done you should have a functional in-memory wave-file to MP3 converter that you can use to convert the WAV file that you are getting from the SpeechSynthesizer into an MP3.

回答2:

Just wanted to post my example too using NAudio.Lame:

NuGet:

Install-Package NAudio.Lame

Code Snip: Mine obviously returns a byte[] - I have a separate save to disk method b/c I think it makes unit testing easier.

public static byte[] ConvertWavToMp3(byte[] wavFile)
        {

            using(var retMs = new MemoryStream())
            using (var ms = new MemoryStream(wavFile))
            using(var rdr = new WaveFileReader(ms))
            using (var wtr = new LameMP3FileWriter(retMs, rdr.WaveFormat, 128))
            {
                rdr.CopyTo(wtr);
                return retMs.ToArray();
            }


        }

回答3:

This is a bit old now, but since you haven't accepted the answer I previously provided...

I have recently built an extension for NAudio that encapsulates the LAME library to provide simplified MP3 encoding.

Use the NuGet package manager to find NAudio.Lame. Basic example for using it available here.

回答4:

Assuming you're trying to convert the output into MP3, you need something that can handle transcoding the audio. There are a number of tools available, but my personal preference is FFmpeg. It's a command line tool so you will need to take that into account, but otherwise it's very easy to use.

There's lots of information online, but you can start by checking out their documentation here.

回答5:

I had a similar requirement in .net4.0 to convert 8bit 8Khz mono wav and used the following code

public void WavToMp3(string wavPath, string fileId)
    {
        var tempMp3Path = TempPath + "tempFiles\\" + fileId + ".mp3";
        var mp3strm = new FileStream(tempMp3Path, FileMode.Create);
        try
        {
            using (var reader = new WaveFileReader(wavPath))
            {
                var blen = 65536;
                var buffer = new byte[blen];
                int rc;
                var bit16WaveFormat = new WaveFormat(16000, 16, 1);
                using (var conversionStream = new WaveFormatConversionStream(bit16WaveFormat, reader))
                {
                    var targetMp3Format = new WaveLib.WaveFormat(16000, 16, 1);
                    using (var mp3Wri = new Mp3Writer(mp3strm, new Mp3WriterConfig(targetMp3Format, new BE_CONFIG(targetMp3Format,64))))
                    {
                        while ((rc = conversionStream.Read(buffer, 0, blen)) > 0) mp3Wri.Write(buffer, 0, rc);
                        mp3strm.Flush();
                        conversionStream.Close();
                    }
                }
                reader.Close();
            }
            File.Move(tempMp3Path, TempPath + fileId + ".mp3");
        }
        finally
        {
            mp3strm.Close();
        }
    }

Prerequists:

.net 4 compiled yeti library (to obtain it download this older one (http://www.codeproject.com/KB/audio-video/MP3Compressor/MP3Compressor.zip) and convert it to .net4.0 then build the solution to obtain the new version dlls)
download the NAudio libraries (as Lame support 16bit wav sample only i had to first convert it from 8bit to 16bit wav)

I have used a buffer size of 64kpbs (my custom requirement)

来源：https://stackoverflow.com/questions/19058530/change-format-from-wav-to-mp3-in-memory-stream-in-naudio

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