public AsrStream NewStream(StreamToken streamToken)
{
InitRequest initRequest = new InitRequest
{
ProductId = this.ProductId,
AppName = this.AppName,
EnableChunk = true,
EnableFlushData = this.Flush,
EnableLongSpeech = true,
LogLevel = this.LogLevel,
SleepRatio = this.SleepRatio,
SendPerSeconds = this.SendPerSeconds,
SamplePointBytes = 2,
Version = ProtoVersion.Version1
};
if (streamToken != null)
{
initRequest.UserName = streamToken.UserName;
initRequest.ExpireTime = streamToken.ExpireString;
initRequest.Token = streamToken.Token;
}
Console.WriteLine("initRequest:{0}", initRequest.ToString());
Metadata meta = new Metadata
{
{ "audio_meta", initRequest.ToByteString().ToBase64() }
};
var stream = client.send(meta);
return(new AsrStream(stream));
}
using Grpc.Core;
using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.IO;
using System.Threading.Tasks;
using static Com.Baidu.Acu.Pie.AsrService;
using Google.Protobuf;
using System.Text;
namespace Com.Baidu.Acu.Pie
{
public class AsrStream
{
private uint sequence = 0;
private readonly AsyncDuplexStreamingCall<AudioFragmentRequest, AudioFragmentResponse> stream;
internal AsrStream(AsyncDuplexStreamingCall<AudioFragmentRequest, AudioFragmentResponse> stream)
{
this.stream = stream;
}
public Task Write(byte[] audioData)
{
return Write(audioData, 0, audioData.Length);
}
public Task Write(byte[] audioData, int offset, int count)
{
AudioFragmentRequest request = new AudioFragmentRequest();
request.SequenceNum = sequence++;
//request.SendTimestamp = (ulong)DateTimeOffset.UtcNow.
request.AudioData = ByteString.CopyFrom(audioData, offset, count);
return stream.RequestStream.WriteAsync(request);
}
public Task WriteComplete()
{
return stream.RequestStream.CompleteAsync();
}
public Task<bool> MoveNext()
{
return stream.ResponseStream.MoveNext();
}
public AudioFragmentResponse Current()
{
return stream.ResponseStream.Current;
}
}
public class StreamToken
{
public string UserName { get; }
public DateTime Expire { get; }
public string Password { get; }
public string ExpireString
{
get
{
return Expire.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'");
}
}
public string Token
{
get
{
var crypt = new SHA256Managed();
var bytes = crypt.ComputeHash(Encoding.ASCII.GetBytes(UserName + Password + ExpireString));
StringBuilder result = new StringBuilder();
for (int i = 0; i < bytes.Length; i++)
{
result.Append(bytes[i].ToString("X2"));
}
return result.ToString().ToLower();
}
}
public StreamToken(string userName, DateTime expire, string password)
{
this.UserName = userName;
this.Expire = expire;
this.Password = password;
}
}
public class AsrClient
{
private Channel channel;
public bool Flush { get; set; }
public string ProductId { get; }
public string AppName { get; set; }
public double SendPerSeconds { get; set; }
public double SleepRatio { get; set; }
public uint LogLevel { get; set; }
public int RecommendPacketSize
{
get
{
return (int)(SendPerSeconds * bitrate * 2);
}
}
private readonly int bitrate;
private AsrServiceClient client;
public AsrClient(string serverAddress, string productId)
{
switch (productId)
{
case "1903":
case "1904":
case "1905":
case "1906":
case "1907":
bitrate = 8000;
break;
case "888":
case "1888":
bitrate = 16000;
break;
default:
throw new Exception("Unrecoginzed product id");
}
this.ProductId = productId;
this.SleepRatio = 1;
this.SendPerSeconds = 0.02;
this.LogLevel = 4;
this.AppName = "csharp_sdk";
this.Flush = true;
channel = new Channel(serverAddress, ChannelCredentials.Insecure);
client = new AsrServiceClient(channel);
}
~AsrClient()
{
// do not wait
channel.ShutdownAsync();
}
public AsrStream NewStream()
{
return NewStream(null);
}
public AsrStream NewStream(StreamToken streamToken)
{
InitRequest initRequest = new InitRequest
{
ProductId = this.ProductId,
AppName = this.AppName,
EnableChunk = true,
EnableFlushData = this.Flush,
EnableLongSpeech = true,
LogLevel = this.LogLevel,
SleepRatio = this.SleepRatio,
SendPerSeconds = this.SendPerSeconds,
SamplePointBytes = 2,
Version = ProtoVersion.Version1
};
if (streamToken != null)
{
initRequest.UserName = streamToken.UserName;
initRequest.ExpireTime = streamToken.ExpireString;
initRequest.Token = streamToken.Token;
}
Console.WriteLine("initRequest:{0}", initRequest.ToString());
Metadata meta = new Metadata
{
{ "audio_meta", initRequest.ToByteString().ToBase64() }
};
var stream = client.send(meta);
return new AsrStream(stream);
}
}
}