Как отправить звук по обратному каналу RTSP? ⇐ C#

[Anonymous]

Моя IP-камера поддерживает аудиовыход (обратный аудиоканал). Я хочу транслировать звук с микрофона ПК в прямом эфире через RTSP, чтобы он был слышен через динамик камеры. Спецификация потоковой передачи ONVIF сообщает мне, что мне нужно отправлять аудиоданные по предоставленному URL-адресу RTSP. Моя камера поддерживает профиль ONVIF T.
Я пробовал:

Код: Выделить всё

  public static RtspClient rtspClient;
public static IWaveIn sourceStream;

private static void CallAudio()
{
string CameraIp = "192.168.1.69";
string UserName = "admin";
string Password = "admin123";
var ClientMessageInspector = new ClientMessageInspector(UserName, Password);

//Call Device Url and get Services.
string DeviceServiceUrl = "http://" + CameraIp + "/onvif/device_service";
var deviceClient = new DeviceClient("DeviceBinding", new EndpointAddress(DeviceServiceUrl));
deviceClient.Endpoint.Behaviors.Add(ClientMessageInspector);
var getServices = deviceClient.GetServices(false);

//Call media2 getStreamingUri.
string url = "http://" + CameraIp + "/onvif/media2_service";
var Media2Client = new Media2Client("Media2Binding", new EndpointAddress(url));
Media2Client.Endpoint.Behaviors.Add(ClientMessageInspector);
var media2GetProfiles = Media2Client.GetProfiles(null, null);
var resp = Media2Client.GetAudioDecoderConfigurationOptions(null, null);
var responseGetAudioStreamUri = Media2Client.GetStreamUri("tcp", profiles[0].token);  //This gets rtsp url of media from camera.

rtspClient = new RtspClient(responseGetAudioStreamUri, UserName, Password);
sourceStream = new WaveInEvent();
sourceStream.WaveFormat = new WaveFormat(64, 8, 1);   //8000 16
sourceStream.DataAvailable += new EventHandler(SourceStream_DataAvailable);
sourceStream.StartRecording();

Console.ReadKey();
}

//This method gets data from PC microphone and enocodes it into Mu-Law G711 and send to rtsp url.
private static void SourceStream_DataAvailable(object sender, WaveInEventArgs e)
{
byte[] encoded = TwoWayAudio_Encode_MuLaw(e.Buffer, 0, e.BytesRecorded);
rtspClient.SendData(encoded, encoded.Length, 3);
}

private static byte[] TwoWayAudio_Encode_MuLaw(byte[] data, int offset, int length)
{
byte[] encoded = new byte[length / 2];
int outIndex = 0;
for (int n = 0; n < length; n += 2)
{
encoded[outIndex++] = MuLawEncoder.LinearToMuLawSample(BitConverter.ToInt16(data, offset + n));
}
return encoded;
}

Клиент RTSP в моем проекте взят отсюда.
Rtspclient.cs

Код: Выделить всё

using Rtsp;
using Rtsp.Messages;
using Rtsp.Sdp;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;

namespace Rtsp
{
public class RtspClient
{
private RtspListener rtsp_client;
private RtspTcpTransport tcp_socket;
public string url;
public bool canPlay = false;
public string username;
public string password;
public ushort seqNo = 0;
public event EventHandler RtspError;
public event EventHandler RtpDataReceived;
public Stopwatch stopwatch { get; private set; }

public RtspClient(string _url, string _username, string _password)
{
url = _url;
username = _username;
password = _password;

var uri = new Uri(_url);

tcp_socket = new RtspTcpTransport(uri.Host, 554); // 554);

if (tcp_socket.Connected == false)
{
Console.WriteLine("Error - did not connect");
return;
}

// Connect a RTSP Listener to the TCP Socket to send messages and listen for replies
rtsp_client = new RtspListener(tcp_socket);

rtsp_client.MessageReceived += Rtsp_client_MessageReceived;
rtsp_client.DataReceived += DataReceived;
rtsp_client.Start(); // start reading messages from the server
rtsp_client.AutoReconnect = true;
RtspRequest describe_message = new RtspRequestDescribe();
describe_message.RtspUri = uri;
describe_message.AddHeader("Accept: application/sdp");
describe_message.AddHeader("Require: www.onvif.org/ver20/backchannel");
rtsp_client.SendMessage(describe_message);

stopwatch = new Stopwatch();
stopwatch.Start();
}

private void DataReceived(object sender, RtspChunkEventArgs e)
{
int rtp_version = (e.Message.Data[0] >> 6);
int rtp_padding = (e.Message.Data[0] >> 5) & 0x01;
int rtp_extension = (e.Message.Data[0] >> 4) & 0x01;
int rtp_csrc_count = (e.Message.Data[0] >> 0) & 0x0F;
int rtp_marker = (e.Message.Data[1] >> 7) & 0x01;
int rtp_payload_type = (e.Message.Data[1] >> 0) & 0x7F;
uint rtp_sequence_number = ((uint)e.Message.Data[2] 

Подробнее здесь: [url]https://stackoverflow.com/questions/59465932/how-to-send-audio-on-rtsp-backchannel[/url]