private Uri m_uri; // Stream URI
#endregion Fields
#region Constructors
//---------------------------------------------------------------------
// Constructors / Finalizer
//---------------------------------------------------------------------
/// <summary>
/// Instance Constructor
/// </summary>
/// <param name="url">URL to connect to</param>
public AudioStream(string url)
{
// Initialize network stream members
m_uri = new Uri(url);
m_tcpClient = new TcpClient();
m_headers = new Dictionary<string, string>();
m_metadataInterval = -1;
// Initialize buffer members
m_buffer = null;
m_stop = new ManualResetEvent(false);
}
//---------------------------------------------------------------------
// Member Functions
//---------------------------------------------------------------------
/// <summary>
/// Connects to the stream, processes headers, and begins buffering
/// </summary>
/// <param name="embedMetadata">Flag to include metadata if possible, check on return</param>
public void Connect(ref bool embedMetadata)
{
string header; // A single HTTP header string
if (m_disposed) throw new ObjectDisposedException(typeof(AudioStream).Name);
if (m_connected) throw new InvalidOperationException("Audio stream has already been connected");
// Attempt to to connect to the provided host and port
m_tcpClient.Connect(m_uri.Host, m_uri.Port);
// Set up the request HTTP headers to pass to the server
string requestHeaders = (embedMetadata) ?
String.Format("GET {0} HTTP/1.0\r\nIcy-Metadata:1\r\n\r\n", m_uri.AbsolutePath) :
String.Format("GET {0} HTTP/1.0\r\n\r\n", m_uri.AbsolutePath);
byte[] requestHeaderBits = Encoding.UTF8.GetBytes(requestHeaders);
m_tcpClient.GetStream().Write(requestHeaderBits, 0, requestHeaderBits.Length);
// Read the HTTP response headers from the connection
StreamReader sr = new StreamReader(m_tcpClient.GetStream());
// The first header must end with "200 OK". This allows for both HTTP and ICY responses.
header = sr.ReadLine();
if (!header.EndsWith("200 OK")) throw new Exception("Invalid response [" + header + "] received from server");
// Read and process the remaining response headers, stopping when the blank one is found.
// This should position the TCP stream at the head of the actual data stream
header = sr.ReadLine();
while (!String.IsNullOrEmpty(header))
{
// Split the header into KEY:VALUE components
int colon = header.IndexOf(':');
if ((colon > 0) && (header.Length > colon + 1))
{
string key = header.Substring(0, colon);
string value = header.Substring(colon + 1);
// SPECIAL HEADER: ICY-METAINT
if (String.Compare(key, "Icy-Metaint", true) == 0) m_metadataInterval = Int32.Parse(value.Trim());
// SPECIAL HEADER: CONTENT-TYPE
else if (String.Compare(key, "content-type", true) == 0) m_contentType = value.Trim();
// EVERYTHING ELSE
else if(!m_headers.ContainsKey(key)) m_headers.Add(key, value);
}
header = sr.ReadLine(); // Next header
}
// Set the return value for embedded metadata and create the audio stream buffer
embedMetadata = (m_metadataInterval > 0);
m_buffer = new AudioStreamBuffer(BUFFER_SIZE, embedMetadata);
// Launch the background worker thread to begin buffering the audio data
m_bufferThread = new Thread(new ThreadStart(BufferThreadProc));
m_bufferThread.IsBackground = true;
m_bufferThread.Priority = ThreadPriority.AboveNormal;
m_bufferThread.Start();
m_connected = true; // Stream is now connected
}
