测试TTS(文本到语音功能)

由于要求程序在windows 2003 server这种低版本系统上运行,所以用了MS Speech SDK 51,质量差点,但是也够用了.

第一部份:如何调用

private void btnTestTTS_Click(object sender, RoutedEventArgs e)
{
//_spVoice.SpeakXml("This sounds normal <pitch middle = '-10'/> but the pitch drops half way through");
_spVoice.SpeakXml("<rate absspeed=\"1\"/>,<rate speed=\"1\"/><pitch absmiddle=\"2\"/><pitch middle=\"5\"/>你的验证码是<spell>1432</spell>");
}

private void btnTestTTS2Wave_Click(object sender, RoutedEventArgs e)
{
_spVoice.Save("<rate absspeed=\"1\"/>,<rate speed=\"1\"/><pitch absmiddle=\"2\"/><pitch middle=\"5\"/>你的验证码是<spell>1432</spell>",
"e:\\temp.wav",
"e:\\a.wav");
}

第二部份:我封装的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using SpeechLib;
using System.Threading;
using System.Diagnostics;
using NAudio.Wave;
using NAudio.Wave.SampleProviders;

namespace WpfApplicationTestTTS
{
/*
* Title:测试TTS(文本到语音功能)
* Author:Kagula
* Date:2015-12-08
* Environment:VS2010SP1、SpeechSDK51、Win7SP1、Win2003
*             SpeechSDK51LangPack(用于支持中文)
*             .NetFramework 4.0 Client Profile.
* Reference:
* 《关于Microsoft Speech SDK 中TTS的研究 [转] 》
* http://www.cnblogs.com/lxinxuan/archive/2007/03/17/678606.html * */
internal class SpVoiceClass
{
SpVoice voice = new SpVoice();
//直接在Speak上播放
internal void SpeakXml(string xml)
{
voice.Speak(xml, SpeechVoiceSpeakFlags.SVSFIsXML | SpeechVoiceSpeakFlags.SVSFlagsAsync);
}

//保存音频到wav文件
internal void Save(string xml, string tempFileName, string fileName)
{
SpFileStream stream = new SpFileStream();
stream.Open(tempFileName, SpeechStreamFileMode.SSFMCreateForWrite, false);
voice.AudioOutputStream = stream;
voice.Speak(xml, SpeechVoiceSpeakFlags.SVSFlagsAsync | SpeechVoiceSpeakFlags.SVSFIsXML);
voice.WaitUntilDone(Timeout.Infinite);
stream.Close();

//输出文件默认采样率为22khz,16bit精度,单声道,所以这里要转换为8khz的音频.
//用到了NAudio第三方库,下载地址为http://naudio.codeplex.com/
//下载后会发现两个dll,只需引入NAudio.dll.
using (var reader = new AudioFileReader(tempFileName))
{
var resampler = new WdlResamplingSampleProvider(reader, 8000);
WaveFileWriter.CreateWaveFile16(fileName, resampler);
}
//经测试,2秒时长的audio可以从88k size减少到32k size.
}
}
}

注意:

[1]如果要在Win2003上运行上面的代码,SpVoice实例的生命期必须是在函数体内的,如果像上面的代码一样生命期是在Class实例内,会抛出异常.

[2]上面的代码在Win7SP1下测试通过.