private async Task <string> SpeechRecognizeAsync(string filename)
{
//将wav文件post到服务器进行语音识别
//将识别回来的文本写入文本框
wav wave = await WaveAccess(filename);
Int16[] wavs = wave.wavs;
int fs = wave.fs;
string wavs_str = "";
string[] tmp_strs = new string[wavs.Length];
for (int i = 0; i < wavs.Length; i++)
{
//tmp_strs[i] = "&wavs=" + wavs[i].ToString();
tmp_strs[i] = wavs[i].ToString();
}
wavs_str = string.Join("&wavs=", tmp_strs);
//string r = await PostDataAsync(url, "qwertasd", wavs_str, fs.ToString());
string r = await post2(url, "qwertasd", fs.ToString(), wavs_str);
return(r);
}
/// <summary>
/// 读取wav文件
/// </summary>
/// <param name="filename"></param>
private async Task <wav> WaveAccess(string filename)
{
try
{
byte[] riff = new byte[4];
byte[] riffSize = new byte[4];
byte[] waveID = new byte[4];
byte[] junkID = new byte[4];
bool hasjunk = false;
byte[] junklength = new byte[4];
byte[] fmtID = new byte[4];
byte[] cksize = new byte[4];
uint waveType = 0;
byte[] channel = new byte[2];
byte[] sample_rate = new byte[4];
byte[] bytespersec = new byte[4];
byte[] blocklen_sample = new byte[2];
byte[] bitNum = new byte[2];
byte[] unknown = new byte[2];
byte[] dataID = new byte[4]; //52
byte[] dataLength = new byte[4]; //56 个字节
//string longFileName = filepath;
//FileStream fs = new FileStream(filepath, FileMode.Open);
//Windows.Storage.StorageFolder s = Windows.ApplicationModel.Package.Current.InstalledLocation;
//FileStream fs;
//StorageFolder storageFolder = Package.Current.InstalledLocation;
StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
StorageFile storageFile = await storageFolder.GetFileAsync(filename);
IRandomAccessStream fileStream = await storageFile.OpenAsync(FileAccessMode.Read);
Stream s = fileStream.AsStream();
BinaryReader bread = new BinaryReader(s);
//BinaryReader bread = new BinaryReader(fs);
riff = bread.ReadBytes(4); // RIFF
if (BitConverter.ToUInt32(bytesReserve(riff), 0) != 0x52494646)
{
Exception e = new Exception("该文件不是WAVE文件");
throw e;
}
riffSize = bread.ReadBytes(4); // 文件剩余长度
if (BitConverter.ToUInt32(riffSize, 0) != bread.BaseStream.Length - bread.BaseStream.Position)
{
//Exception e = new Exception("该WAVE文件损坏，文件长度与标记不一致");
//throw e;
}
waveID = bread.ReadBytes(4);
if (BitConverter.ToUInt32(bytesReserve(waveID), 0) != 0x57415645)
{
Exception e = new Exception("该文件不是WAVE文件");
throw e;
}
byte[] tmp = bread.ReadBytes(4);
if (BitConverter.ToUInt32(bytesReserve(tmp), 0) == 0x4A554E4B)
{
//包含junk标记的wav
junkID = tmp;
hasjunk = true;
junklength = bread.ReadBytes(4);
uint junklen = BitConverter.ToUInt32(junklength, 0);
//将不要的junk部分读出
bread.ReadBytes((int)junklen);
//读fmt 标记
fmtID = bread.ReadBytes(4);
}
else if (BitConverter.ToUInt32(bytesReserve(tmp), 0) == 0x666D7420)
{
fmtID = tmp;
}
else
{
Exception e = new Exception("无法找到WAVE文件的junk和fmt标记");
throw e;
}
if (BitConverter.ToUInt32(bytesReserve(fmtID), 0) != 0x666D7420)
{
//fmt 标记
Exception e = new Exception("无法找到WAVE文件fmt标记");
throw e;
}
cksize = bread.ReadBytes(4);
uint p_data_start = BitConverter.ToUInt32(cksize, 0);
int p_wav_start = (int)p_data_start + 8;
waveType = bread.ReadUInt16();
if (waveType != 1)
{
// 非pcm格式，暂不支持
Exception e = new Exception("WAVE文件不是pcm格式，暂时不支持");
throw e;
}
//声道数
channel = bread.ReadBytes(2);
//采样频率
sample_rate = bread.ReadBytes(4);
int fs = (int)BitConverter.ToUInt32(sample_rate, 0);
//每秒钟字节数
bytespersec = bread.ReadBytes(4);
//每次采样的字节大小，2为单声道，4为立体声道
blocklen_sample = bread.ReadBytes(2);
//每个声道的采样精度，默认16bit
bitNum = bread.ReadBytes(2);
tmp = bread.ReadBytes(2);
//寻找da标记
while (BitConverter.ToUInt16(bytesReserve(tmp), 0) != 0x6461)
{
tmp = bread.ReadBytes(2);
}
tmp = bread.ReadBytes(2);
if (BitConverter.ToUInt16(bytesReserve(tmp), 0) != 0x7461)
{
//ta标记
Exception e = new Exception("无法找到WAVE文件data标记");
throw e;
}
//wav数据byte长度
uint DataSize = bread.ReadUInt32();
//计算样本数
long NumSamples = (long)DataSize / 2;
if (NumSamples == 0)
{
NumSamples = (bread.BaseStream.Length - bread.BaseStream.Position) / 2;
}
//if (BitConverter.ToUInt32(notDefinition, 0) == 18)
//{
// unknown = bread.ReadBytes(2);
//}
//dataID = bread.ReadBytes(4);
Int16[] data = new Int16[NumSamples];
for (int i = 0; i < NumSamples; i++)
{
//读入2字节有符号整数
data[i] = bread.ReadInt16();
}
s.Dispose();
bread.Dispose();
wav wave = new wav();
wave.wavs = data;
wave.fs = fs;
return(wave);
}
catch (System.Exception ex)
{
//return null;
throw ex;
}
}