C# Save text to speech to MP3 file

问题:

I am wondering if there is a way to save text to speech data to an mp3 or Wav file format to be played back at a later time?

SpeechSynthesizer reader = new SpeechSynthesizer();
reader.Rate = (int)-2;
reader.Speak("Hello this is an example expression from the computers TTS engine in C-Sharp);

I am trying to get that saved externally so I can play it back later. What is the best way to do this?

回答1:

There are multiple options such as saving to an existing stream. If you want to create a new WAV file, you can use the SetOutputToWaveFile method.

reader.SetOutputToWaveFile(@"C:\MyWavFile.wav");

回答2:

Not my answer, copy paste from How do can I use LAME to encode an wav to an mp3 c#

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Easiest way in .Net 4.0:

Use the visual studio Nuget Package manager console:

Install-Package NAudio.Lame

Code Snip: Send speech to a memory stream, then save as mp3:

//reference System.Speech
using System.Speech.Synthesis; 
using System.Speech.AudioFormat;

//reference Nuget Package NAudio.Lame
using NAudio.Wave;
using NAudio.Lame; 


using (SpeechSynthesizer reader = new SpeechSynthesizer()) {
    //set some settings
    reader.Volume = 100;
    reader.Rate = 0; //medium

    //save to memory stream
    MemoryStream ms = new MemoryStream();
    reader.SetOutputToWaveStream(ms);

    //do speaking
    reader.Speak("This is a test mp3");

    //now convert to mp3 using LameEncoder or shell out to audiograbber
    ConvertWavStreamToMp3File(ref ms, "mytest.mp3");
}

public static void ConvertWavStreamToMp3File(ref MemoryStream ms, string savetofilename) {
    //rewind to beginning of stream
    ms.Seek(0, SeekOrigin.Begin);

    using (var retMs = new MemoryStream())
    using (var rdr = new WaveFileReader(ms))
    using (var wtr = new LameMP3FileWriter(savetofilename, rdr.WaveFormat, LAMEPreset.VBR_90)) {
        rdr.CopyTo(wtr);
    }
}

回答3:

Often, if something works on a dev workstation but not on a production server, its a permissions issue. two thoughts: Does Lame create temporary files somewhere? If so the IIS process needs write permissions there. When writing the output file, again the IIS process needs permission to write that. ConvertWavStreamToMp3File(ref ms, "mytest.mp3"); "mytest.mp3" will probably need to be a full path, using Server.MapPath()